GCN Circular 12672
Subject
GRB 111212A: Swift/UVOT Upper Limits
Date
2011-12-12T15:55:48Z (12 years ago)
From
Craig Swenson at PSU/Swift <cswenson@astro.psu.edu>
C. A. Swenson (PSU) reports on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 111212A
3272 s after the BAT trigger (Campana et al., GCN Circ. 12667).
No optical afterglow consistent with the XRT position
(Osborne et al., GCN Circ. 12670) is detected in the initial
UVOT exposures. Preliminary 3-sigma upper limits using the UVOT
photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373)
for the first finding chart (FC) exposure and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 3272 3422 147 >20.3
white 3272 5481 541 >21.3
v 4255 5751 255 >19.2
b 3637 5276 393 >20.1
u 3432 5071 393 >20.1
w1 4665 4865 197 >20.1
m2 4460 4660 197 >20.3
w2 4050 5687 393 >21.0
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.05 in the direction of the burst
(Schlegel et al. 1998).