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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).
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