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GCN Circular 27090

Subject
GRB 200215A: Swift/UVOT Upper Limits
Date
2020-02-16T01:29:30Z (4 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 200215A
90 s after the BAT trigger (Bernardini et al., GCN Circ. 27079).
No optical afterglow consistent with the XRT position (Evans et al. GCN
Circ. 27089) 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            90          240          147         >20.0
u_FC               302          552          246         >20.0
white               90         7290          581         >21.2
v                  634         5070          294         >18.5
b                  559         7092          294         >19.8
u                  302         6885          481         >20.3
w1                1087         6680          216         >19.2
w2               10534        11091          547         >19.8

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.15 in the direction of the burst
(Schlegel et al. 1998).
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