GCN Circular 12569
Subject
GRB 111117A: Swift/UVOT Upper Limits
Event
Date
2011-11-18T11:04:27Z (14 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S. R. Oates (MSSL-UCL) and V. Mangano (INAF-IASFPA)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 111117A
137 s after the BAT trigger (Mangano et al., GCN Circ. 12559).
No optical afterglow consistent with the XRT position
(Melandri et al., GCN Circ. 12565) or the optical position
(Andersen et al., GCN Circ. 12563 & Fong et al., GCN Circ. 12566) 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
u_FC 137 387 246 >20.4
v 443 1241 97 >19.3
b 392 1191 117 >20.0
u 137 1315 490 >20.7
w1 493 1290 97 >20.4
m2 468 1117 78 >19.5
w2 419 1217 97 >21.5
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst
(Schlegel et al. 1998).