GCN Circular 12862
Subject
GRB 120118B: Swift/UVOT Upper Limits
Date
2012-01-19T05:11:09Z (12 years ago)
From
Margaret Chester at PSU <chester@astro.psu.edu>
M. M. Chester (PSU) and O. M. Littlejohns (U Leicester)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 120118B
116 s after the BAT trigger (Littlejohns et al., GCN Circ. 12852).
No optical afterglow consistent with the enhanced XRT position
(Osborne et al., GCN Circ. 12857) is detected in the initial UVOT data.
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) exposures and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 116 265 147 >20.9
u_FC 328 577 246 >19.9
white 116 1528 392 >21.6
v 657 1574 113 >19.1
b 583 1504 97 >20.5
u 328 1479 324 >20.2
w1 708 1454 78 >19.0
m2 682 1430 78 >19.9
w2 633 1554 117 >19.8
The magnitudes in the table are not corrected for the Galactic
extinction
due to the reddening of E(B-V) = 0.15 in the direction of the burst
(Schlegel et al. 1998).