//////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 410 SUBJECT: IPN localization of BATSE #7766 (GRB990915) DATE: 99/09/16 21:08:10 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley, on behalf of the Ulysses GRB team, and Scott Barthelmy, on behalf of the GCN team, report: We have derived a preliminary IPN annulus for BATSE trigger #7766 (GRB990915) using Ulysses and BATSE data. This annulus is centered at RA(2000)=22h 31m 51s, Decl(2000)=+14o 45' 21", and has a radius of 86.361o +/- 0.09o (3 sigma). This annulus just crosses the updated COMPTEL contours for this burst, and slightly misses the BATSE LOCBURST position. A map may be found at ssl.berkeley.edu/ipn3/990915/. This annulus will be refined considerably when the final data become available. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 412 SUBJECT: IPN error box for GRB990915 (=BATSE 7766) DATE: 99/09/17 22:41:57 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley, on behalf of the Ulysses GRB team, Scott Barthelmy, on behalf of the GCN team, and T. Cline, on behalf of the NEAR GRB team, report: NEAR observed BATSE trigger #7766, leading to a preliminary error box (as opposed to just the annulus reported in GCN 410) for this burst, whose corners are at: RA(2000) Decl.(2000) 07 h 35 m 05 s 74o 39' 40" 07 h 05 m 51 s 72o 31' 43" 07 h 19 m 06 s 73o 47' 57" 06 h 48 m 19 s 71o 02' 41" This error box is located roughly between the COMPTEL and LOCBURST positions. A map may be found at ssl.berkeley.edu/ipn3/990915/. This error box will be refined considerably when the final data become available. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 416 SUBJECT: GRB 990915 optical observations DATE: 99/09/26 09:13:19 GMT FROM: Alberto Castro-Tirado at LAEFF-INTA GRB 990915, optical observations --------------------------------- Alberto Castro-Tirado, LAEFF-INTA (Madrid) and IAA-CSIC (Granada) on behalf of a large collaboration: Victor Costa and Jose L. Ortiz, IAA-CSIC Oliver Cordes, Martin Altmann and Daniel Harbeck, Univ. of Bonn Javier Gorosabel, LAEFF-INTA Mara Salvato and Jochen Greiner, AIP (Potsdam) Kevin Hurley, UCBerkeley/SSL reports: "Following the detection of the strong burst GRB 990915 by BATSE and COMPTEL (Batse trigger # 7766) we have obtained: -150 frames (60-s, no filter, 20' x 13' FOV) at the 0.8-m Schmidt telescope of the German-Spanish Calar Alto Observatory (CAHA) starting 0.5 hr after the burst. The frames covered a significant fraction of the Hunstville/Locburst and COMPTEL error boxes and about a 15 % of the NEAR error box given by Hurley et al. in GCN 412. -25 frames (60-s, R-band, 16' x 16' FOV) at the 1.23-m CAHA telescope starting 30 hr after the burst. The frames covered an additional fraction (65 %) of the NEAR error box. -10 frames (150-s, R-band) at the 1.23-m CAHA telescope starting 50 hr after the burst. The frames covered the rest (20 %) of the NEAR error box. After a careful visual comparison with the Digital Sky Survey, I have not found any source varying more than 0.3 mag when comparing to the DSS-1 charts, i.e. a limit of R > 20.5 can be imposed to the GRB 990915 optical afterglow."