TITLE: GCN CIRCULAR NUMBER: 35303 SUBJECT: GRB 231205B: Swift-BAT refined analysis DATE: 23/12/07 14:01:00 GMT FROM: Tyler Parsotan at NASA GSFC <tyler.parsotan@nasa.gov> T. Parsotan (GSFC), S. D. Barthelmy (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU) (i.e. the Swift-BAT team): Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 231205B (trigger #1200812) (Evans, et al., GCN Circ. 35269). The BAT ground-calculated position is RA, Dec = 54.151, 27.150 deg which is RA(J2000) = 03h 36m 36.3s Dec(J2000) = +27d 09' 00.7" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 50%. The mask-weighted light curve shows a strong peak near the time of trigger. There is also emission prior to the main peak of the lightcurve at ~T-30 sec. T90 (15-350 keV) is 46.94 +- 7.84 sec (estimated error including systematics). The time-averaged spectrum from T-29.66 to T+54.16 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.38 +- 0.05. The fluence in the 15-150 keV band is 7.4 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T-5.04 sec in the 15-150 keV band is 7.1 +- 0.4 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/1200812/BA/ <http://gcn.gsfc.nasa.gov/notices_s/1200812/BA/> <http://gcn.gsfc.nasa.gov/notices_s/1200812/BA/> <http://gcn.gsfc.nasa.gov/notices_s/1200812/BA/>> View this GCN Circular online at https://gcn.nasa.gov/circulars/35303. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...