14902( 3) - 08-Feb-2017 17:06:54 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14902 Version: 3 Check-in Time: 08-Feb-2017 17:06:54 STScI Edit Number: 1 Title Imaging and UV Spectroscopy of the Luminous and Unique Nuclear Transient PS16dtm ------------------------------------------------------------------------------------ Type Cycle GO/DD 24 ------------------------------------------------------------------------------------ Investigators Contact? PI: Mr. Peter Blanchard Harvard University Y CoI: Matt Nicholl Harvard University N CoI: Prof. Edo Berger Harvard University N ------------------------------------------------------------------------------------ Abstract The latest generation of untargeted time domain surveys have discovered new rare types of transients such as superluminous supernovae and tidal disruption events. Recent discoveries have also included luminous transients coincident with the nuclei of their host galaxies, making classification into established categories difficult, especially when the galaxy also has an active galactic nucleus. We propose to obtain imaging and UV spectroscopy using STIS of PS16dtm, a recently discovered luminous nuclear transient with unusual properties. We will use the imaging to dramatically refine the location of PS16dtm to assess the nuclear nature of the event. The UV spectrum will allow us to understand the nature of absorption in the UV and extend our spectroscopic comparisons to bluer wavelengths. These HST observations are critical for understanding the origin of this rare transient as a superluminous supernova, tidal disruption event, or AGN variability. ------------------------------------------------------------------------------------ Observations Description ------------------------ We request one orbit to obtain two observations of PS16dtm: a NUV spectrum with STIS/NUV-MAMA and an optical image with STIS/CCD. ------------------------------------------------------------------------------------ 14902( 3) - 08-Feb-2017 17:06:54 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 PS16DTM UNIDENTIFIED, NUCLEUS RA=01H58M4.7390S, J2000 V = 15.94 +/- 0.06 DEC=-00D52'21.73" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 14902( 3) - 08-Feb-2017 17:06:54 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type STIS-CCD-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.2835 Line_Spacing 0.2835 Coordinate_Frame POS-TARG Pattern_Orient 26.6 Angle_Between_Sides 143.130102 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 14902( 3) - 08-Feb-2017 17:06:54 - [ 4] Visit: 01 Visit Requirements: On Hold Comments: 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 PS16DTM STIS/CCD ACQ F28X50LP MIRROR 1 10 S (10 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 PS16DTM STIS/NUV ACCUM 52X0.2 G230L 2376 1 1607 S -MAMA (1607 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 PS16DTM STIS/CCD ACCUM 50CCD MIRROR CR-SPLIT=NO, GAIN=4 1 20 S (80 PATTERN 1 3 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 | ------------------------------------------------------------------------------------------------------------------------------------ PS16DTM 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A PS16DTM 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 N/A -MAMA PS16DTM 3 STIS/CCD ACCUM 50CCD MIRROR 1 none none none 1 N/A PS16DTM 3 STIS/CCD ACCUM 50CCD MIRROR 2 none none none 1 N/A PS16DTM 3 STIS/CCD ACCUM 50CCD MIRROR 3 none none none 1 N/A PS16DTM 3 STIS/CCD ACCUM 50CCD MIRROR 4 none none none 1 N/A 14902( 3) - 08-Feb-2017 17:06:54 - [ 5] Summary Form for Proposal 14902 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 50CCD, 52X0.2, F28X50LP ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO, GAIN=4 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 3 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G230L, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names PS16DTM ------------------------------------------------------------------------------------------------------------------------------------