GCN Circular 10721
Subject
GRB 100504A: Swift/UVOT Observations
Event
Date
2010-05-05T21:46:28Z (16 years ago)
From
Mike Siegel at PSU/Swift MOC <siegel@astro.psu.edu>
M. H. Siegel (PSU) and J. Mao (INAF-OAB) report on behalf
of the Swift/UVOT team.
The Swift/UVOT began settled observations of the field of
GRB 100504A 72s after the BAT trigger (Mao et al.,
GCN Circ. 10712). Data summed from the first and second orbits
do not reveal a source at the enhanced position of the X-ray
afterglow (Mao et al., GCN Circ. 10713).
The 3-sigma upper limits for the finding chart (fc) and
summed exposures are reported below:
FILTER T_start(s) T_stop Exposure Mag/3UL
========================================================
white fc 72 222 147 >20.39
white 73 1705 391 >20.91
v 614 1755 136 >18.54
b 713 1680 97 >19.35
u 1463 1816 45 >18.43
uvw1 836 1804 97 >18.92
uvw2 762 1037 38 >18.43
=======================================================
The above magnitudes are not corrected for the Galactic extinction
corresponding to a reddening of E_{B-V} = 0.87 (Schlegel et al.,
1998, ApJS, 500, 525). The photometry is on the UVOT photometric
system described in Poole et al. (2008, MNRAS, 383, 627).