GCN Circular 11499
Subject
GRB 101225A: Swift/UVOT Detection
Event
Date
2010-12-26T16:20:36Z (15 years ago)
From
Mike Siegel at PSU/Swift MOC <siegel@astro.psu.edu>
M. H. Siegel (PSU) and J. L. Racusin (NASA/GSFC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 101225A
1387 s after the BAT trigger (Racusion et al., GCN Circ. 11493). We
find
a marginal detection in the later data consistent with the enhanced
XRT position (Evans et al., GCN Circ. 11497). Preliminary 3-sigma upper
limits and magnitudes using the UVOT photometric system
(Poole et al. 2008, MNRAS, 383, 627) for the exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
V 1387 1705 58 >19.11
V 5572 29944 2601 >21.40
B 1485 1655 38 >19.84
B 5161 28991 3933 21.73+-0.29
U 1460 1630 38 >19.35
U 4955 7534 507 >20.68
UVW1 1435 1754 58 >19.25
UVW1 5982 7413 393 20.58+-0.37
UVM2 1410 1729 58 >18.74
UVM2 5777 7208 393 20.12+-0.34
UVW2 1512 1680 38 >18.82
UVW2 5367 6798 393 19.67+-0.22
UVW2 11650 12550 885 20.35+-0.22
UVW2 17470 18370 885 19.62+-0.15
UVW2 23218 29897 1771 20.10+-0.14
The values quoted above are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.10 in the direction of the burst
(Schlegel et al. 1998).