TITLE: GCN CIRCULAR NUMBER: 39606 SUBJECT: GRB 250306A: Swift detection of a burst DATE: 25/03/06 16:51:42 GMT FROM: David Palmer at LANL palmer@lanl.gov
P. A. Evans (U Leicester), R. Gupta (NASA GSFC), J. A. Kennea (PSU), K. L. Page (U Leicester) and D. M. Palmer (LANL) report on behalf of the Neil Gehrels Swift Observatory Team:
At 16:30:08 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 250306A (trigger=1293340). Swift did not slew to the burst. The BAT on-board calculated location is RA, Dec 354.730, -47.993 which is RA(J2000) = 23h 38m 55s Dec(J2000) = -47d 59' 35" 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 10 sec. The peak count rate was ~14,000 counts/sec (15-350 keV), at ~0 sec after the trigger.
Due to a Sun observing constraint, Swift cannot slew to the BAT position until 01:23 UT on 2025 March 18. There will thus be no XRT or UVOT data for this trigger before this time.
Burst Advocate for this burst is P. A. Evans (pae9 AT leicester.ac.uk). 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/)
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