Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
Introducing Einstein Probe, Astro Flavored Markdown, and Notices Schema v4.0.0. See news and announcements

GCN Circular 3866

GRB050824: Swift-BAT detection of a burst
2005-08-25T00:31:30Z (19 years ago)
Scott Barthelmy at NASA/GSFC <>
S. Campana (INAF-OAB), S. Barthelmy (GSFC), D. Burrows (PSU),
J. Cummings (GSFC/NRC), N. Gehrels (GSFC), S. Hunsberger (PSU),
M. Ivanushkina (PSU), F. Marshall (GSFC), D. Palmer (LANL),
G. Tagliaferri (INAF-OAB),
on behalf of the Swift team:

At 23:12:16 UT, Swift-BAT triggered and located GRB050824 (trigger=151905).
This was a 64-sec image trigger.  The spacecraft did not automatically slew
due to proximity to the moon (25 degrees).  Hence there will be no immediate
results from XRT or UVOT.  However, a TOO is being planned for this target.
The BAT on-board calculated location is RA,Dec 12.237d,+22.592d
{00h 48m 57s,+22d 35' 31"} (J2000), with an uncertainty of 3 arcmin
(radius, 90% containment, stat+sys).  The BAT light curve shows a broad peak
from T+30 to T+70 sec.  The emission is present only in the 15-50 keV band.
The peak count rate was ~500 counts/sec (15-50 keV) at ~40 seconds
after the trigger.  At this early stage of the analysis we think this is
likely a GRB, as there is no known gamma-ray source at this location
in the SIMBAD database and the galactic latitude is -40 degrees.
Looking for U.S. government information and services? Visit