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GCN Circular 34565

Subject
GRB 230826A: Swift detection of a burst
Date
2023-08-26T20:16:03Z (6 months ago)
From
David Palmer at LANL <palmer@lanl.gov>
Via
email

R. A. J. Eyles-Ferris (U Leicester), S. Dichiara (PSU),
J.D. Gropp (PSU), J. A. Kennea (PSU), D. M. Palmer (LANL),
T. M. Parsotan (GSFC/UMBC/CRESSTII), M. H. Siegel (PSU) and
A. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift
Observatory Team:

At 19:32:47 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 230826A (trigger=1187463).  Swift slewed immediately to
the location.  The BAT on-board calculated location is 
RA, Dec 83.012, +66.125 which is 
  RA(J2000) = 05h 32m 03s
  Dec(J2000) = +66d 07' 30"
with an uncertainty of 3 arcmin (radius, 90% containment, including 
systematic uncertainty).  Preliminary quicklook data suggests that the
light curve is doubly peaked with a T90 of ~50 sec and background 
subtracted peak count rate of ~4000 counts/sec at T0+3 sec. 

The XRT began observing the field at 19:34:03.7 UT, 76.7 seconds after
the BAT trigger. Using promptly downlinked data we find a bright,
uncatalogued X-ray source located at RA, Dec 83.05920, 66.12506 which
is equivalent to:
   RA(J2000)  =  5h 32d 14.2s,
   Dec(J2000) = 66h 07d 30.2s
with an uncertainty of 10.0 arcseconds (radius, 90% containment). This
location is 69 arcseconds from the BAT onboard position, within the BAT
error circle. 

Due to a telemetry gap, no further information is available at
this time.  However a simultaneous Fermi trigger (GCN #34564) 
confirms the GRB. 

Burst Advocate for this burst is R. A. J. Eyles-Ferris (raje1 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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