GCN Circular 3157
Subject
GRB 050331: Swift UVOT Source
Date
2005-03-31T19:03:26Z (20 years ago)
From
Pete Roming at PSU <roming@astro.psu.edu>
M. Still (GSFC/USRA), W. Landsman (GSFC), A. Morgan, C. James (MSSL), S.
Hunsberger (PSU), A. Breeveld (MSSL), P. Roming (PSU), K. Mason, P. Schady
(MSSL), M. Ivanushkina (PSU), T. Poole (MSSL), C. Gronwall (PSU), A.
Blustin (MSSL), P. Brown (PSU), S. Rosen, K. McGowan, M. De Pasquale
(MSSL), P. Boyd (GSFC/UMBC), S. T. Holland (GSFC/USRA), M. Carter, H.
Huckle (MSSL), P. Broos (PSU), T. Kennedy, P. Smith, B. Hancock (MSSL), S.
Koch (PSU), S. Zane (MSSL), D. Hinshaw (GSFC/SPSYS), J. Nousek (PSU), N.
Gehrels (GSFC), on behalf of the Swift UVOT team.
The Swift Ultra-Violet/Optical Telescope (UVOT) began settled observations
of the field of GRB 050331 (Angelini et al; GCN 3155) at 17:14:09 UT, 135s
after the BAT trigger. The first data taken after spacecraft settling was
a 100s V image, sent directly to the ground through the TDRSS system, with
pixel binning of 8x8 to reduce telemetry. Binned pixel sizes are 4x4 arcsec
and the field of view is 5.3x5.3 arcmin. An extremely bright source,
consistent with the XRT position, is found in the image. A magnitude can
not be determined at this time due to saturation of the detector (13.0 mag).