GCN Circular 39938

S. B. Cenko (GSFC), K. L. Page (U Leicester) and M. H. Siegel (PSU)
report on behalf of the Neil Gehrels Swift Observatory Team:

At 06:07:38 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 250330A (trigger=1299776).  Swift slewed immediately to the burst.
The BAT on-board calculated location is 
RA, Dec 252.790, -86.870 which is 
   RA(J2000) = 16h 51m 10s
   Dec(J2000) = -86d 52' 11"
with an uncertainty of 3 arcmin (radius, 90% containment, including 
systematic uncertainty).  The BAT light curve showed a single peak
structure with a duration of about 10 sec.  The peak count rate
was ~5800 counts/sec (15-350 keV), at ~0 sec after the trigger.

The XRT began observing the field at 06:08:51.3 UT, 73.2 seconds after
the BAT trigger. Due to the proximity of Swift to the SAA, XRT centroided on
a cosmic ray. Given the short visibility window, no other data are available
at this time.

UVOT data are not available at this time.

Although this trigger occurred while Swift was close to the SAA, the
BAT light-curve shows a definite peak, and Fermi-GBM also triggered at the
same time.

Burst Advocate for this burst is S. B. Cenko (brad.cenko AT nasa.gov).
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/)