7964( 2) - 03/18/98 16:29 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 7964 Version: 2 Check-in Date: 18-Mar-1998 16:28:31 1.Proposal Title: The host galaxy of GRB 971214 ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO/DD 7 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: SHRINIVAS KULKARNI CALTECH CoI: S. G. Djorgovski Caltech N CoI: J. S. Bloom Caltech N CoI: S. C. Odewahn Caltech N CoI: A. N. Ramaprakash Caltech N CoI: K. L. Adelberger Caltech N CoI: D. A. Frail NRAO N CoI: J. P. Halpern Columbia N CoI: D. J. Helfand Columbia N CoI: J. Bahcall IAS N CoI: M. Dickinson JHU N ------------------------------------------------------------------------------------ 5. Abstract We have detected a galaxy that is coincident with the fading optical counterpart of GRB 971214. Spectroscopy with the Keck telescope shows the presence of a strong emission feature which we argue is Lyman alpha, redshifted by z=3.4. The inferred energetics for this GRB are an order of magnitude larger than can be accomodated by coalescing neutron star models. Before abandoning this popular model it is important to rule out other possibilities, principally that the real host is a foreground galaxy. A deep HST STIS observation is urgently needed to either confirm or deny this remaining possibility. ------------------------------------------------------------------------------------ Observations Description ------------------------ An image of the proposed host R=25.6 host galaxy with STIS and Clear Filter. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 7964( 2) - 03/18/98 16:29 - [ 2] Data Distribution Media: ELECTRONIC Blocking Factor: 10 Ship To: S. R. Kulkarni*105-24 Palomar Observatory*Caltech, Pasadena CA 91125 Ship Via: Email: srk@astro.caltech.edu ------------------------------------------------------------------------------------ 7964( 2) - 03/18/98 16:29 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 GRB-971214- GALAXY, HIGH REDSHIFT RA = 11H 56M 26.40S +/- 0.1S, J2000 Z=3.4 V = 26.6 HOST GALAXY DEC = 65D 12' 00.5" +/- 0.5" B-V = 1 Comments: Host galaxy of GRB 971214 7964( 2) - 03/18/98 16:29 - [ 4] Visit: 01 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GRB-971214- STIS/C ACCUM 50CCD MIRROR GAIN=1,BINAXIS1=1,BINAXIS2=1, 1 2800 S EXPAND; MAX DUR 150%; END HOST CD CR-SPLIT=4,PATTERN=BOX,NUM-POS=4, ORBIT SCALING-FACTOR=4.1 Comments: We use a 4-point box dither pattern with one CR-SPLIT exposure per orbit. We used CR-SPLIT=4 to divide each orbit's exposure into 4 sub-exposures for cosmic ray rejection. We expand the default BOX pattern by 4.1x to get N+0.5 pixel subsampling, i.e. the default 0.25 arcsec pattern spacing unit becomes 1.025 arcseconds, or 20.5 pixels. ------------------------------------------------------------------------------------------------------------------------------------ 7964( 2) - 03/18/98 16:29 - [ 5] Summary Form for Proposal 7964 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters GAIN=1 BINAXIS1=1 BINAXIS2=1 CR-SPLIT=4 PATTERN=BOX NUM-POS=4 SCALING-FACTOR=4.1 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO/DD ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements EXPAND; MAX DUR 150%; END ORBIT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names GRB-971214-HOST ------------------------------------------------------------------------------------------------------------------------------------