GCN Circular 13948
Subject
GRB 121102A: Swift/UVOT Upper Limits
Date
2012-11-02T18:48:01Z (11 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S. R. Oates (MSSL-UCL) and V. D'Elia (ASDC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 121102A
58 s after the BAT trigger (D'Elia et al., GCN Circ. 13938).
No optical afterglow consistent with the XRT position
(Osborne et al. GCN Circ. 13945) 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 58 207 147 >20.1
u_FC 270 519 246 >19.6
white 58 24618 2113 >21.4
v 4994 17253 1278 >20.0
b 5814 23858 2022 >21.4
u 270 22945 1524 >20.9
w1 5404 18848 1066 >20.8
m2 5200 18158 1279 >21.1
w2 4789 13077 1073 >21.2
The magnitudes in the table are not corrected for the high Galactic extinction
due to the reddening of E(B-V) = 1.48 in the direction of the burst
(Schlegel et al. 1998).