TITLE: GCN CIRCULAR NUMBER: 39877 SUBJECT: GRB 250327A: Swift detection of a burst DATE: 25/03/27 08:11:09 GMT FROM: Jamie Kennea at Penn State jak51@psu.edu
T. M. Parsotan (GSFC), J. J. DeLaunay (PSU), R. Gupta (NASA GSFC), J. A. Kennea (PSU) and K. L. Page (U Leicester) report on behalf of the Neil Gehrels Swift Observatory Team:
At 07:30:04 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 250327A (trigger=1299088). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 248.197, +61.595 which is RA(J2000) = 16h 32m 47s Dec(J2000) = +61d 35' 43" 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 40 sec. The peak count rate was ~1648 counts/sec (15-350 keV), at ~3 sec after the trigger.
Due to an observing constraint, Swift did not get data immediately. We will report on XRT data in a later GCN.
Burst Advocate for this burst is T. M. Parsotan (tyler.parsotan AT nasa.gov). 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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