GCN Circular 17057
Subject
GRB 141109A: Swift/UVOT Detection
Date
2014-11-10T22:55:16Z (9 years ago)
From
Frank Marshall at GSFC <femarsha@khamseen.gsfc.nasa.gov>
F.E. Marshall (NASA/GSFC) and P. D'Avanzo (INAF-OAB)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 141109A
139 s after the BAT trigger (D'Avanzo et al., GCN Circ. 17037).
A source consistent with the optical position (Covino, GCN Circ. 17039;
Xu et al., GCN Circ. 17040) is detected in the initial UVOT exposures.
The preliminary detections and 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 139 289 147 20.0 +/- 0.2
white 3991 4191 197 20.8 +/- 0.2
v 5656 5856 197 >18.9
b 3786 3986 197 >20.3
u 297 6276 227 >19.7
w1 6066 6266 197 >20.1
m2 5861 6061 197 >20.7
w2 4197 4339 140 >20.9
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).