GCN Circular 17400
Subject
GRB 150203A: Swift/UVOT Upper Limits
Date
2015-02-04T13:38:23Z (9 years ago)
From
Margaret Chester at PSU <chester@swift.psu.edu>
M. M. Chester (PSU) and T. N. Ukwatta (LANL) report on behalf of the
Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 150203A
83 s after the BAT trigger (Ukwatta et al., GCN Circ. 17377).
No optical afterglow consistent with the enhanced XRT position
(Evans et al. GCN Circ. 17384) 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) exposures and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 83 232 147 >20.6
white 83 1197 353 >21.2
v 624 1246 78 >18.7
b 550 1172 58 >19.4
u_FC 295 545 246 >20.0
u 295 1148 285 >20.0
w1 674 1278 61 >18.8
m2 649 1271 78 >18.7
w2 600 1222 78 >19.0
The magnitudes in the table are not corrected for the large Galactic
extinction in the direction of the burst (reddening of E(B-V) = 0.9;
Schlegel et al. 1998).