TITLE:   GCN CIRCULAR
NUMBER:  34058
SUBJECT: GRB 230622A: Swift detection of a burst
DATE:    23/06/22 10:25:32 GMT
FROM:    K.L. Page at U Leicester <klp5@leicester.ac.uk>


A. Melandri (INAF-OAR), A. D'Ai (INAF-IASFPA), J. A. Kennea (PSU),
K. L. Page (U Leicester) and M. H. Siegel (PSU) report on behalf of
the Neil Gehrels Swift Observatory Team:

At 10:04:21 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 230622A (trigger=1176135).  Swift slewed immediately to the burst. 
The BAT on-board calculated location is 
RA, Dec 292.532, -32.922 which is 
   RA(J2000) = 19h 30m 08s
   Dec(J2000) = -32d 55' 16"
with an uncertainty of 3 arcmin (radius, 90% containment, including 
systematic uncertainty).  The BAT light curve showed a single-peaked
structure with a duration of about 5 sec.  The peak count rate
was ~2020 counts/sec (15-350 keV), at ~0 sec after the trigger. 

The XRT began observing the field at 10:10:36.3 UT, 375.1 seconds after
the BAT trigger. No source was detected in the 2.5-s promptly available
image. We are waiting for the full dataset to detect and localise the
XRT counterpart. 

UVOT took a finding chart exposure of 114 seconds with the White filter
starting 378 seconds after the BAT trigger. No credible afterglow candidate has
been found in the initial data products. The 2.7'x2.7' sub-image covers 25% of
the BAT error circle. The typical 3-sigma upper limit has been about 19.6 mag. 
The 8'x8' region for the list of sources generated on-board covers 100% of the
BAT error circle. The list of sources is typically complete to about 18 mag. No
correction has been made for the expected extinction corresponding to E(B-V) of
0.101. 

Burst Advocate for this burst is A. Melandri (andrea.melandri AT inaf.it). 
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/)