GCN Circular 17499
Subject
GRB 150222A: Swift/UVOT Upper Limits
Date
2015-02-23T12:43:28Z (9 years ago)
From
Paul Kuin at MSSL <npkuin@gmail.com>
N. P. M. Kuin (UCL-MSSL) and M. G. Bernardini (INAF-OAB)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 150222A
96 s after the BAT trigger (Bernardini et al., GCN Circ. 17486).
No optical afterglow consistent with the XRT position (Beardmore et
al. GCN Circ. 17494) 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 96 246 147 >20.8
u_FC 308 558 246 >20.7
white 96 6906 746 >21.3
v 639 5881 274 >19.9
b 564 6702 452 >20.9
u 308 6496 678 >20.8
w1 689 6292 432 >20.0
m2 836 6086 413 >20.4
w2 1019 6994 297 >20.5
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.05 in the direction of the burst
(Schlegel et al. 1998).