TITLE: GCN CIRCULAR NUMBER: 35343 SUBJECT: GRB 231215A: Swift detection of a burst DATE: 23/12/15 09:55:59 GMT FROM: David Palmer at LANL <palmer@lanl.gov> P. D'Avanzo (INAF-OAB), R. Brivio (INAF-OAB), M. Ferro (INAF-OAB), J.D. Gropp (PSU), K. L. Page (U Leicester), D. M. Palmer (LANL), T. Sakamoto (AGU), C. Salvaggio (INAF-OAB), T. Sbarrato (INAF-OAB), B. Sbarufatti (INAF-OAB) and M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 09:47:25 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 231215A (trigger=1202522). Swift could not immediately slew due to an Earth limb observing constraint. The BAT on-board calculated location is RA, Dec 9.750, +57.642 which is RA(J2000) = 00h 39m 00s Dec(J2000) = +57d 38' 32" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 30 sec. The peak count rate was ~6000 counts/sec (15-350 keV), at ~1 sec after the trigger. Due to an observing constraint, Swift will not slew until T0+42.6 minutes. There will be no XRT or UVOT data until this time. Burst Advocate for this burst is P. D'Avanzo (paolo.davanzo AT inaf.it). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/) View this GCN Circular online at https://gcn.nasa.gov/circulars/35343. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...