TITLE:   GCN CIRCULAR
NUMBER:  33339
SUBJECT: GRB 230217A: Swift detection of a short burst
DATE:    23/02/17 22:07:41 GMT
FROM:    Kim Page at U.of Leicester  <kimlpage1978@gmail.com>

M. J. Moss (GWU), R. A. J. Eyles-Ferris (U Leicester),
J.D. Gropp (PSU), H. A. Krimm (NSF), F. E. Marshall (NASA/GSFC),
K. L. Page (U Leicester), B. Sbarufatti (INAF-OAB) and
M. A. Williams (PSU) report on behalf of the Neil Gehrels Swift
Observatory Team:

At 21:53:10 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 230217A (trigger=1154967).  Swift did not slew to the burst
due to an observing constraint. 
The BAT on-board calculated location is 
RA, Dec 280.771, -28.856 which is 
   RA(J2000) = 18h 43m 05s
   Dec(J2000) = -28d 51' 19"
with an uncertainty of 3 arcmin (radius, 90% containment, including 
systematic uncertainty).  The BAT light curve showed a single short
peak with a duration of about 1 sec.  The peak count rate
was ~15000 counts/sec (15-350 keV), at ~0 sec after the trigger. 

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

Burst Advocate for this burst is M. J. Moss (mikejmoss3 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/)