[vsnet-grb-info 10044] GRB 101225A: Swift/UVOT Detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  11499
SUBJECT: GRB 101225A: Swift/UVOT Detection
DATE:    10/12/26 16:20:36 GMT
FROM:    Mike Siegel at PSU/Swift MOC  <siegel at 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).