GCN Circular 19087
Subject
GRB 160225A: Swift/UVOT Upper Limits
Date
2016-02-26T05:10:10Z (8 years ago)
From
Mike Siegel at PSU/Swift MOC <siegel@swift.psu.edu>
M. H. Siegel (PSU) reports on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 160225A
839 s after the BAT trigger (Siegel et al., GCN Circ. 19075).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 19077) or the previously reported
optical position (Wierema, et al., GCN Circ. 19082)
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 839 989 147 >20.7
white 839 2657 342 >21.1
v 1121 2708 194 >19.9
b 1047 2632 194 >20.8
u 1022 2608 156 >19.9
w1 998 3036 311 >20.1
m2 1494 2912 236 >20.2
w2 1446 2683 78 >20.0
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).