GCN Circular 3249
Subject
GRB 050412: Early Optical/Ultraviolet Observations with
Date
2005-04-12T14:41:30Z (20 years ago)
From
Pete Roming at PSU <roming@astro.psu.edu>
P. Roming (PSU), V. Mangano (INAF-IASF/Palermo), S. T. Holland (GSFC-USRA),
W. Landsman (GSFC), P. Schady (PSU & MSSL), D. Hinshaw (GSFC-SPSYS), S.
Kobayashi (PSU), A. Blustin (MSSL), N. Gehrels (GSFC), K. Mason (MSSL), J.
Nousek (PSU), and A. Wells (Leicester) on behalf
of the Swift UVOT team report:
The Swift Ultraviolet/Optical Telescope (UVOT) observed the field of GRB
050412 (Cummings et al., GCN 3237) starting at 05:45:40 UT on 12 April
2005. We find no evidence for a source in the 5 arcsecond radius XRT error
circle (Tamburelli et al., GCN 3241) in the UVOT data. The 3-sigma
limiting magnitudes in a 3.5 arcsecond radius circular aperture is V = 19.1
with a systematic uncertainty of 0.1 mag due to uncertainty in the
preliminary flight photometric zero point.