GCN Circular 15358
Subject
GRB 131018A: Swift/UVOT Upper Limits
Date
2013-10-19T17:28:41Z (11 years ago)
From
Massimiliano de Pasquale at MSSL-UCL <m.depasquale@ucl.ac.uk>
M. De Pasquale (UCL-MSSL) and A. Melandri (INAF-OAB)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 131018A
99 s after the BAT trigger (Melandri et al., GCN Circ. 15349).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 15352) 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 120 270 147 >21.3
u_FC 279 528 246 >20.5
white 120 13702 1588 >22.4
v 99 7600 581 >20.3
b 534 19468 2174 >22.0
u 279 18703 2368 >21.9
w1 657 17790 1382 >21.3
m2 632 7805 568 >20.5
w2 584 7395 568 >20.8
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.26 in the direction of the burst
(Schlegel et al. 1998).