GCN Circular 41781

N. J. Klingler (GSFC/UMBC/CRESSTII), S. Dichiara (PSU),
R. Gupta (NASA GSFC), A. Y. Lien (U Tampa) and D. M. Palmer (LANL)
report on behalf of the Neil Gehrels Swift Observatory Team:

At 01:27:46 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 250911A (trigger=1348587).  Due to an observing constraint
Swift did not immediately slew to the burst.
The BAT on-board calculated location is 
RA, Dec 263.762, -16.844 which is 
   RA(J2000) = 17h 35m 03s
   Dec(J2000) = -16d 50' 36"
with an uncertainty of 3 arcmin (radius, 90% containment, including 
systematic uncertainty).  The BAT light curve showed a complex
structure with a duration of about 20 sec.  The peak count rate
was ~1200 counts/sec (15-350 keV), at ~3 sec after the trigger.

Due to an observing constraint, Swift will not slew until T0+50
minutes. There will be no XRT or UVOT data until this time.

Burst Advocate for this burst is N. J. Klingler (noelklin AT umbc.edu).
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/)