GCN Circular 3276
Subject
GRB 050416: Swift/UVOT detection of afterglow emission
Date
2005-04-16T19:13:08Z (19 years ago)
From
Patricia Schady at MSSL/Swift <ps@mssl.ucl.ac.uk>
P. Schady (MSSL), T. Sakamoto (GSFC/NRC), K. McGowan (MSSL), P. Boyd
(GSFC/UMBC), P. Roming (PSU), 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 050416 (Sakamoto et al; GCN 3264) at 11:05:49 UT, 65s
after the BAT trigger. A comparison of the 100s finding chart in the V
filter against the Digitized Sky Survey reverals a new source inside the
XRT error circle at
RA = 12 33 54.56 Dec = +21 03 27.73
and consistent with the P60 positition reported by Bradley Cenko & Fox (GCN
3265). The V band magnitude is V = 19.38. The magnitude is based on preliminary
zero-points, measured in orbit and will require refinement with further
calibration.
Further detailed analysis is ongoing.