13853( 7) - 14-Sep-2015 11:50:00 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13853 Version: 7 Check-in Time: 14-Sep-2015 11:50:00 STScI Edit Number: 0 Title UV Spectroscopy of Newly Discovered Tidal Disruption Flares ------------------------------------------------------------------------------------ Type Cycle GO 22 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Stephen Bradley Cenko NASA Goddard Space Flight Center Y CoI: Dr. Iair Arcavi Las Cumbres Observatory Global Telescope N Network CoI: Dr. Lin Yan California Institute of Technology N CoI: Prof. Andrew J. Levan The University of Warwick N CoI: Prof. Nial R. Tanvir University of Leicester N CoI: Dr. Andrew S. Fruchter Space Telescope Science Institute N CoI: Prof. Joshua S. Bloom University of California - Berkeley N CoI: Prof. Alex V. Filippenko University of California - Berkeley N CoI: Dr. Linda Strubbe Canadian Institute for Theoretical N Astrophysics CoI: Dr. Nathaniel Butler University of California - Berkeley N CoI: Dr. Rebekah Hounsell University of Illinois at Urbana - N Champaign CoI: Dr. Dheeraj Pasham University of Maryland N ------------------------------------------------------------------------------------ Abstract When a star passes within the sphere of disruption of a massive black hole, tidal forces will overcome self-gravity and unbind the star. While approximately half of the stellar debris is ejected at high velocities, the remaining material remains bound to the black hole and accretes, resulting in a luminous, long-lived transient known as a tidal disruption flare (TDF). Aside from serving as a unique laboratory for accretion physics, TDFs offer the hope of measuring black hole masses in galaxies much too distant for resolved kinematic studies. In the simplest analytic models, the black hole mass should scale as dt^2, where dt is the time delay between the disruption and the start of the flare. Two primary factors have so far limited precise black hole mass estimates from current TDF searches: 1) The difficulty of distinguishing a bona fide TDF from the many other transients that can occur in galactic nuclei; 2) Determing the nature of the disrupted star from the observed electromagnetic signal (in particular the presence or absence of H in optical spectra). Here we request non-disruptive ToO spectra of two nearby TDF candidates in the UV with STIS. Our objectives are to search for unique "smoking gun" signatures of the tidal disruption process, and to constrain the geometry and composition of the newly formed accretion disk (and hence the disrupted star). Much like type Ia supernovae, these observations will furthermore serve as a cornerstone for future high-redshift TDF discoveries by LSST, where the rest-frame UV emission is redshifted into the optical bandpass. ------------------------------------------------------------------------------------ Observations Description ------------------------ 13853( 7) - 14-Sep-2015 11:50:00 - [ 2] We request non-disruptive ToO HST observations of two (2) nearby (z <~ 0.3) candidate tidal disruption flares (TDFs) in Cycle 22 or 23. In order to avoid triggering on false positives (i.e., supernovae, AGN outbursts), we require the following (strict) criteria be met in order to trigger our program: - Detection of an optically variable source astrometrically consistent with the nucleus of a resolved galaxy. - Evidence of an absence of previous AGN activity, either photometrically (i.e., through a constant light curve in the historical PTF database) and/or spectroscopically (i.e., a spectrum that is inconsistent with an AGN or LINER). - High luminosity (M <~ -19 mag), with a blue, thermal spectrum, and a slow temporal evolution (weeks to months), to distinguish from core-collapse supernovae. - Resides in a nearby (z <~ 0.3) galaxy (so that we are sampling rest-frame UV with our STIS spectra). - UV detection with the Swift satellite (to ensure limited host extinction, and also for MAMA safety considerations). Our principle objective is to obtain UV (1200-3000 A) spectra of our TDF candidates around maximum light, as this is a region inaccessible from the ground, and we expect unique signatures in this bandpass. We note that these observations are entirely unique to HST -- the Swift grism is neither sufficiently sensitive nor sufficiently high resolution to conduct such observations. As our primary objective (and the bulk of our time request) is dedicated to UV science, we consider this proposal appropriate for the UV initiative. While the exact details of our source cannot be known at the moment, we can use PS1-10jh and previous PTF discoveries as templates to plan our observation. We assume an r-band magnitude around peak of ~ 20 (note that PTF discoveries will be limited to sources approximately this magnitude or brighter, as the survey limit is r <~ 21 mag), a blackbody spectrum with T ~ 1e4 K, and little to no host extinction (the requirement of a Swift UV detection will limit us to at most lightly extincted sight lines). Inputting this SED into the online exposure time calculator, we find we can achieve the largest SNR in the near-UV using STIS with the NUV-MAMA detector and the G230L (1570-3180 A) grating. We assume our targets are visible for 54 minutes each orbit. After including overheads for guide-star acquisition (6 min for the first orbit, 4 min for the second orbit), target acquisition (~ 8 min for an extended source, no peak-up required for 0.2" slit width), and wavelength calibration (4 min per orbit), we find that we can obtain 80 min of integration time (36 min in the first orbit, 44 in the second) with a two-orbit visit. According to the exposure time calculator, we would expect a SNR per resolution element >= 10 for the range from 1650-3000 A for the continuum emission. This should allow us to easily detect strong (W >= 1 A) absorption lines. Simple CLOUDY models of an accretion disk of solar composition also suggest we should be able to detect at least emission lines of Mg II and C III at these wavelengths (depending on the exact redshift of the source). In the far UV, we have compared the throughput possible with both COS (G140L grating) and STIS (G140L grating) and find that they are roughly comparable. To enable the possibility of executing our spectroscopic observations in a single 13853( 7) - 14-Sep-2015 11:50:00 - [ 3] visit, as well as enable some amount of subtraction of the surrounding host galaxy, we have chosen STIS with the FUV-MAMA detector. Using similar overheads as above, with three (3) orbits we can obtain ~ 125 min of exposure time with this setup. Using the exposure time calculator, this implies a SNR >= 10 over the range from 1200-1700 A for the continuum. Here we should be most sensitive to C IV, Si IV, and, most importantly, Ly-alpha (both in emission and absorption). In addition to spectroscopy, we also request three (3) orbits of WFC3 imaging of each source. We have chosen WFC3 because of its finer pixel scale (for astrometry). The first epoch should be obtained near peak (though it need only coincide with the UV spectroscopy within ~ 2 weeks or so). Here we will obtain a strong detection of the transient emission in the F606W filter: we choose a redder (than UV) filter to ensure a sufficient number of sources for astrometric alignment. This can then be used for precise astrometry to ensure that the transient is indeed located in the host galaxy nucleus (following host subtraction). Assuming standard overheads and dither patterns, a source with the characteristics described above (r = 20 mag, T = 5e4K) will be detected with SNR > 100. Given the brightness of the source, we should also have time to image in a second filter even in just one orbit, in which case we will select a broadband UV option (e.g., F225W). Note that we may need to apply a post flash to avoid charge transfer issues in this case. Finally, at late times (> 6 months post-peak), when the transient emission has significantly faded, we will obtain a single epoch of reference imaging of the host galaxy. 1 orbit will be detected to WFC3-UVIS imaging in the same filters to use for template subtraction (and precise astrometry), while the other will be obtained with the NIR channel (F160W) to enable the most precise possible bulge-disk decomposition for the host. Our past experience with this technique implies we can achieve an astrometric precision of < 10 mas in the transient location, while any galaxy with M_BH >~ 1e5 Msun at z <~ 3 will be bright enough to measure the bulge luminosity in a single orbit of F160W imaging. Our total HST request then comes to 16 orbits of HST observations (5 STIS + 3 WFC3 per target). We emphasize that due to the slowly evolving nature of these transients, we do not require disruptive ToO observations, but can instead obtain spectra at maximum light with a time delay of at least three weeks. ------------------------------------------------------------------------------------ 13853( 7) - 14-Sep-2015 11:50:00 - [ 4] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 3 ASASSN-14LI EXT-STAR, NUCLEUS RA=12H48M15.2300S +/- 0.3", J2000 Z = 0.02 V = 16.0 +/- 0.2 DEC=+17D46'26.20" +/- 0.3" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 4 IPTF15AF EXT-STAR, ACCRETION RA=08H48M28.1300S +/- 0.1", J2000 V = 18.0 +/- 0.1 DISK, NUCLEUS DEC=+22D03'34.20" +/- 0.1" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 5 ASASSN-15OI EXT-STAR, ACCRETION RA=20H39M9.0960S, J2000 V = 17.0 DISK, NUCLEUS DEC=-30D45'20.71" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 13853( 7) - 14-Sep-2015 11:50:00 - [ 5] TARGET LIST Generic Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Selection Criteria | Flux data No | Name | Description | | ------------------------------------------------------------------------------------------------------------------------------------ 1 TDF-TOO1 OTHER: LONG-LIVED, THERMAL V = 20.0 TRANSIENT FROM NUCLEUS OF NON-ACTIVE GALAXY ------------------------------------------------------------------------------------------------------------------------------------ 2 TDF-TOO2 OTHER: LONG-LIVED, THERMAL V = 20.0 TRANSIENT FROM NUCLEUS OF NON-ACTIVE GALAXY ------------------------------------------------------------------------------------------------------------------------------------ 13853( 7) - 14-Sep-2015 11:50:00 - [ 6] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE-3PT Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.135 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 46.84 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-LINE-3PT Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.605 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 41.788 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 13853( 7) - 14-Sep-2015 11:50:00 - [ 7] Visit: 01 Visit Requirements: BETWEEN 05-JAN-2015:00:00:00 AND 18-JAN-2015:00:00:00; ON HOLD ; TOO RESPONSE TIME 21.0D On Hold Comments: Triggering based on detection of tidal disruption candidate ASASSN-14li. Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 ASASSN-14LI STIS/CCD ACQ F25ND3 MIRROR 1 130 S (130 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 ASASSN-14LI STIS/NUV ACCUM 52X0.2 G230L 2376 1 1750.0 S -MAMA (1750 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 ASASSN-14LI STIS/FUV ACCUM 52X0.2 G140L 1425 1 2888.0 S -MAMA (2888 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ ASASSN-14LI 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A ASASSN-14LI 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 N/A -MAMA ASASSN-14LI 3 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 2 N/A -MAMA 13853( 7) - 14-Sep-2015 11:50:00 - [ 8] Visit: 02 Visit Requirements: BETWEEN 07-OCT-2015:00:00:00 AND 28-OCT-2015:00:00:00; ON HOLD ; TOO RESPONSE TIME 21.0D On Hold Comments: Slow ToO TDF trigger Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 ASASSN-15OI WFC3/UVI ACCUM UVIS F606W 1 400.0 S PATTERN 1 1 S (1200 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 ASASSN-15OI WFC3/UVI ACCUM UVIS F225W CR-SPLIT=2, FLASH=10.0 1 1146.0 S S (1146 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ ASASSN-15OI 1 WFC3/UVI ACCUM UVIS F606W 1 none none none 1 N/A S ASASSN-15OI 1 WFC3/UVI ACCUM UVIS F606W 2 none none none 1 N/A S ASASSN-15OI 1 WFC3/UVI ACCUM UVIS F606W 3 none none none 1 N/A S ASASSN-15OI 2 WFC3/UVI ACCUM UVIS F225W none none none 1 1 N/A S ASASSN-15OI 2 WFC3/UVI ACCUM UVIS F225W none none none 2 1 N/A S 13853( 7) - 14-Sep-2015 11:50:00 - [ 9] Visit: 03 Visit Requirements: SAME ORIENT AS 02; AFTER 02 BY 180.0 D TO 365.0 D; ON HOLD ; ON HOLD FOR 02 On Hold Comments: Host galaxy observations for TDF candidate 1. Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 ASASSN-15OI WFC3/UVI ACCUM UVIS F606W 1 400.0 S PATTERN 1 1 S (1200 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 ASASSN-15OI WFC3/UVI ACCUM UVIS F225W CR-SPLIT=2, FLASH=10.0 1 1146.0 S S (1146 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 ASASSN-15OI WFC3/IR MULTIAC IR F160W NSAMP=15, SAMP-SEQ=STEP100 1 DEF PATTERN 2 3 CUM (2697.7 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ ASASSN-15OI 1 WFC3/UVI ACCUM UVIS F606W 1 none none none 1 N/A S ASASSN-15OI 1 WFC3/UVI ACCUM UVIS F606W 2 none none none 1 N/A S ASASSN-15OI 1 WFC3/UVI ACCUM UVIS F606W 3 none none none 1 N/A S ASASSN-15OI 2 WFC3/UVI ACCUM UVIS F225W none none none 1 1 N/A S ASASSN-15OI 2 WFC3/UVI ACCUM UVIS F225W none none none 2 1 N/A S ASASSN-15OI 3 WFC3/IR MULTIAC IR F160W 1 none none none 2 N/A CUM ASASSN-15OI 3 WFC3/IR MULTIAC IR F160W 2 none none none 2 N/A CUM ASASSN-15OI 3 WFC3/IR MULTIAC IR F160W 3 none none none 2 N/A CUM 13853( 7) - 14-Sep-2015 11:50:00 - [ 10] Visit: 04 Visit Requirements: BETWEEN 23-FEB-2015:00:00:00 AND 09-MAR-2015:00:00:00; ON HOLD ; TOO RESPONSE TIME 21.0D On Hold Comments: Slow ToO for TDF candidate 2. Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 IPTF15AF STIS/CCD ACQ F28X50LP MIRROR 1 60 S (60 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 IPTF15AF STIS/NUV ACCUM 52X0.2 G230L 2376 1 2130 S -MAMA (2130 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 IPTF15AF STIS/NUV ACCUM 52X0.2 G230L 2376 1 2922 S -MAMA (2922 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 IPTF15AF STIS/FUV ACCUM 52X0.2 G140L 1425 1 2922.0 S -MAMA (2922 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 IPTF15AF STIS/FUV ACCUM 52X0.2 G140L 1425 1 2922.0 S -MAMA (2922 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 IPTF15AF STIS/FUV ACCUM 52X0.2 G140L 1425 1 2922.0 S -MAMA (2922 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ IPTF15AF 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A IPTF15AF 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 N/A -MAMA IPTF15AF 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 N/A -MAMA IPTF15AF 4 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 3 N/A -MAMA IPTF15AF 5 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 4 N/A -MAMA IPTF15AF 6 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 5 N/A -MAMA 13853( 7) - 14-Sep-2015 11:50:00 - [ 11] Visit: 05 Visit Requirements: ON HOLD ; TOO RESPONSE TIME 21.0D On Hold Comments: Slow ToO for TDF candidate 2. Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 TDF-TOO2 WFC3/UVI ACCUM UVIS F606W 1 400.0 S PATTERN 1 1 S (1200 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 TDF-TOO2 WFC3/UVI ACCUM UVIS F225W CR-SPLIT=2 1 1146.0 S S (1146 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ TDF-TOO2 1 WFC3/UVI ACCUM UVIS F606W 1 none none none 1 N/A S TDF-TOO2 1 WFC3/UVI ACCUM UVIS F606W 2 none none none 1 N/A S TDF-TOO2 1 WFC3/UVI ACCUM UVIS F606W 3 none none none 1 N/A S TDF-TOO2 2 WFC3/UVI ACCUM UVIS F225W none none none 1 1 N/A S TDF-TOO2 2 WFC3/UVI ACCUM UVIS F225W none none none 2 1 N/A S 13853( 7) - 14-Sep-2015 11:50:00 - [ 12] Visit: 06 Visit Requirements: AFTER 05 BY 180.0 D TO 365.0 D; ON HOLD ; ON HOLD FOR 05 On Hold Comments: Host galaxy observations for TDF candidate 2. Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 TDF-TOO2 WFC3/UVI ACCUM UVIS F606W 1 400.0 S PATTERN 1 1 S (1200 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 TDF-TOO2 WFC3/UVI ACCUM UVIS F225W CR-SPLIT=2 1 1146.0 S S (1146 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 TDF-TOO2 WFC3/IR MULTIAC IR F160W NSAMP=15, SAMP-SEQ=STEP100 1 DEF PATTERN 2 3 CUM (2697.7 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ TDF-TOO2 1 WFC3/UVI ACCUM UVIS F606W 1 none none none 1 N/A S TDF-TOO2 1 WFC3/UVI ACCUM UVIS F606W 2 none none none 1 N/A S TDF-TOO2 1 WFC3/UVI ACCUM UVIS F606W 3 none none none 1 N/A S TDF-TOO2 2 WFC3/UVI ACCUM UVIS F225W none none none 1 1 N/A S TDF-TOO2 2 WFC3/UVI ACCUM UVIS F225W none none none 2 1 N/A S TDF-TOO2 3 WFC3/IR MULTIAC IR F160W 1 none none none 2 N/A CUM TDF-TOO2 3 WFC3/IR MULTIAC IR F160W 2 none none none 2 N/A CUM TDF-TOO2 3 WFC3/IR MULTIAC IR F160W 3 none none none 2 N/A CUM 13853( 7) - 14-Sep-2015 11:50:00 - [ 13] Visit: 07 Visit Requirements: BETWEEN 07-OCT-2015:00:00:00 AND 28-OCT-2015:00:00:00; ON HOLD ; TOO RESPONSE TIME 21.0D On Hold Comments: Slow ToO for TDF candidate 2. Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 ASASSN-15OI STIS/CCD ACQ F28X50LP MIRROR 1 60 S (60 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 ASASSN-15OI STIS/NUV ACCUM 52X0.2 G230L 2376 1 2130 S -MAMA (2130 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 ASASSN-15OI STIS/NUV ACCUM 52X0.2 G230L 2376 1 2922 S -MAMA (2922 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 ASASSN-15OI STIS/FUV ACCUM 52X0.2 G140L 1425 1 2922.0 S -MAMA (2922 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 ASASSN-15OI STIS/FUV ACCUM 52X0.2 G140L 1425 1 2922.0 S -MAMA (2922 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 ASASSN-15OI STIS/FUV ACCUM 52X0.2 G140L 1425 1 2922.0 S -MAMA (2922 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ ASASSN-15OI 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A ASASSN-15OI 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 N/A -MAMA ASASSN-15OI 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 N/A -MAMA ASASSN-15OI 4 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 3 N/A -MAMA ASASSN-15OI 5 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 4 N/A -MAMA ASASSN-15OI 6 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 5 N/A -MAMA 13853( 7) - 14-Sep-2015 11:50:00 - [ 14] Summary Form for Proposal 13853 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 52X0.2, F25ND3, F28X50LP, IR, UVIS ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/FUV-MAMA, STIS/NUV-MAMA, WFC3/IR, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=2, FLASH=10.0, NSAMP=15, SAMP-SEQ=STEP100 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 02 BY 180.0 D TO 365.0 D, AFTER 05 BY 180.0 D TO 365.0 D, BETWEEN 05-JAN-2015:00:00:00 AND 18-JAN-2015:00:00:00, BETWEEN 07-OCT-2015:00:00:00 AND 28-OCT-2015:00:00:00, BETWEEN 23-FEB-2015:00:00:00 AND 09-MAR-2015:00:00:00, ON HOLD , ON HOLD FOR 02, ON HOLD FOR 05, PATTERN 1 1, PATTERN 2 3, SAME ORIENT AS 02, TOO RESPONSE TIME 21.0D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F160W, F225W, F606W, G140L, G230L, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names ASASSN-14LI, ASASSN-15OI, IPTF15AF, TDF-TOO2 ------------------------------------------------------------------------------------------------------------------------------------