GCN Circular 13751
Subject
GRB 120911A: Swift/UVOT Upper Limits
Event
Date
2012-09-11T18:48:50Z (13 years ago)
From
Paul Kuin at MSSL <npkuin@gmail.com>
N. P. M. Kuin (MSSL-UCL) and J. K. Cannizzo (NASA/UMBC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 120911A
3323 s after the BAT trigger (Cannizzo et al., GCN Circ. 13744).
No optical afterglow consistent with the XRT position (Beardmore et al.
GCN Circ. 13748) 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 3323 3473 147 >20.5
white 3323 11009 1229 >21.6
v 3479 15918 1278 >19.9
b 4300 10097 1160 >21.5
u 4095 5730 393 >20.4
w1 3890 5526 393 >20.0
m2 3684 5320 393 >21.1
w2 4710 11585 757 >20.9
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 1.12 in the direction of the burst
(Schlegel et al. 1998).