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GCN Circular 35101

Subject
GRB 231118A: Swift detection of a burst
Date
2023-11-18T17:31:56Z (3 months ago)
From
David Palmer at LANL <palmer@lanl.gov>
Via
email

S. Laha (GSFC/UMBC), M. Ferro (INAF-OAB), C. Gronwall (PSU),
M. J. Moss (GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL),
T. M. Parsotan (GSFC/UMBC/CRESSTII), T. Sbarrato (INAF-OAB),
M. H. Siegel (PSU) and A. Tohuvavohu (U Toronto) report on behalf of
the Neil Gehrels Swift Observatory Team:

At 17:16:33 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 231118A (trigger=1197311).  Swift slewed immediately to the burst. 
The BAT on-board calculated location is 
RA, Dec 4.843, -48.035 which is 
   RA(J2000) = 00h 19m 22s
   Dec(J2000) = -48d 02' 07"
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 15 sec.  The peak count rate
was ~11,000 counts/sec (15-350 keV), at ~0 sec after the trigger. 

Due to a telemetry outage, XRT and UVOT data are not
immediately available and will be reported later. 

Burst Advocate for this burst is S. Laha (sib.laha 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/)


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