GCN Circular 12446
Subject
GRB 111016A: Swift/UVOT Detection of a Source
Event
Date
2011-10-17T18:18:13Z (15 years ago)
From
Tyler Pritchard at PSU <tapritchard@astro.psu.edu>
T. A. Pritchard (PSU) and V. Mangano (INAF-IASFPA)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 111016A
188 s after the BAT trigger (Mangano et al., GCN Circ. 12439).
No optical afterglow consistent with the Enhanced Swift-XRT position
(Evans et al., GCN Circ 12441) is detected in the initial UVOT exposures,
however a marginal source is detected in followup observations in the
UVOT white filter. This position is consistent with the source observed by
Cenko et all (GCN Circ 12444). Preliminary 3-sigma upper limits and
magnitudes using the UVOT photometric system
(Poole et al. 2008, MNRAS, 383, 627) for the first finding chart (FC)
exposure and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 188 337 147 >20.3
u_FC 345 595 246 >19.3
white 188 23781 1926 >21.5
white 27360 45216 4662 21.56
v 4468 16602 1278 >20.5
b 5288 23264 1967 >21.6
u 345 22351 1328 >20.4
w1 724 18207 1095 >20.5
m2 700 17507 1298 >20.8
w2 651 12429 1135 >20.7
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.04 in the direction of the burst
(Schlegel et al. 1998).