GCN Circular 15621
Subject
GRB 131227A: Swift/UVOT Upper Limits
Event
Date
2013-12-27T15:55:33Z (12 years ago)
From
Massimiliano de Pasquale at MSSL-UCL <m.depasquale@ucl.ac.uk>
M. De Pasquale (UCL-MSSL) and S. R. Oates (UCL-MSSL)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 131227A
66 s after the BAT trigger (Oates et al. GCN Circ. 15616).
No optical afterglow consistent with the enhanced XRT position
(Evans et al. GCN Circ. 15618) or the source detected by KAIT (Zheng
et al. GCN 15617) 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 66 216 147 >20.6
u_FC 278 528 246 >19.9
white 66 13019 1430 >21.9
v 608 6785 471 >19.7
b 534 12318 1160 >21.1
u 278 11406 1366 >20.9
w1 5558 7195 393 >20.1
w2 4942 6580 393 >20.5
The magnitudes in the table are not corrected for the strong Galactic
extinction due to the reddening of E(B-V) = 1.02 in the direction of
the burst (Schlegel et al. 1998).