TITLE: GCN CIRCULAR NUMBER: 36909 SUBJECT: GRB 240720A: Swift detection of a burst DATE: 24/07/20 00:40:15 GMT FROM: David Palmer at LANL <palmer@lanl.gov> R. Gupta (NASA/GSFC), V. D'Elia (SSDC & INAF-OAR) and D. M. Palmer (LANL) report on behalf of the Neil Gehrels Swift Observatory Team: At 00:24:51 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 240720A (trigger=1243868). Swift did not slew to the burst due to a pointing constraint. The BAT on-board calculated location is RA, Dec 96.700, +30.342 which is RA(J2000) = 06h 26m 48s Dec(J2000) = +30d 20' 30" 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 3 sec. The peak count rate was ~5400 counts/sec (15-350 keV), at ~0 sec after the trigger. Due to a Sun observing constraint, Swift cannot slew to the BAT position. There will thus be no immediate XRT or UVOT data for this trigger. Burst Advocate for this burst is R. Gupta (rahulbhu.c157 AT gmail.com). 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/36909. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...