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GCN Circular 34234

GRB 230723B: Swift detection of a burst
2023-07-23T11:54:24Z (10 months ago)
K.L. Page at U Leicester <>

K. L. Page (U Leicester), J.D. Gropp (PSU), H. A. Krimm (NSF),
T. M. Parsotan (GSFC/UMBC/CRESSTII) and M. H. Siegel (PSU) report on
behalf of the Neil Gehrels Swift Observatory Team:

At 11:42:32 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 230723B (trigger=1180410).  
The BAT on-board calculated location is 
RA, Dec 250.379, -5.327 which is 
   RA(J2000) = 16h 41m 31s
   Dec(J2000) = -05d 19' 37"
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 10 sec.  The peak count rate
was ~2200 counts/sec (15-350 keV), at ~1 sec after the trigger. 

Due to an observing constraint, Swift will not slew until T0+50.2
minutes. There will be no XRT or UVOT data until this time. 

Burst Advocate for this burst is K. L. Page (klp5 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:

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