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 33173

GRB 230116C: Swift detection of a burst
2023-01-16T15:53:25Z (a year ago)
David Palmer at LANL <>
E. Sonbas (Adiyaman Univ.), R. A. J. Eyles-Ferris (U Leicester),
C. Gronwall (PSU), J.D. Gropp (PSU), A. Y. Lien (U Tampa),
K. L. Page (U Leicester), D. M. Palmer (LANL),
A. Tohuvavohu (U Toronto) and M. A. Williams (PSU) report on behalf of
the Neil Gehrels Swift Observatory Team:

At 15:33:21 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 230116C (trigger=1149250).  Due to an observing constraint,
Swift could not slew to the burst. 
The BAT on-board calculated location is 
RA, Dec 223.463, -16.871 which is 
   RA(J2000) = 14h 53m 51s
   Dec(J2000) = -16d 52' 16"
with an uncertainty of 3 arcmin (radius, 90% containment, including 
systematic uncertainty).  Although this is an image trigger, the
BAT lightcurve seems to show a complex structure starting around T-50
until a pre-planned slew away from the burst location at T+30, with
a peak of ~300 counts/s (15-350 keV) near the time of the trigger. 

Due to a Moon observing constraint, Swift cannot slew to the BAT
position until 09:10 UT on 2023 January 18. There will thus be no XRT
or UVOT data for this trigger before this time. 

Burst Advocate for this burst is E. Sonbas (edasonbas AT 
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:
Looking for U.S. government information and services? Visit