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GCN Circular 17392

Subject
GRB 150202A: Swift/UVOT Upper Limits
Date
2015-02-03T19:14:39Z (9 years ago)
From
Margaret Chester at PSU <chester@swift.psu.edu>
M. M. Chester (PSU) and H. A. Krimm (CRESST/GSFC/USRA)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 150202A
93 s after the BAT trigger (Krimm et al., GCN Circ. 17376).
No optical afterglow consistent with the XRT position (Beardmore et al. 
GCN Circ. 17382) 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            93          243          147         >20.6
u_FC               305          555          246         >20.2
white               93         6568          624         >21.5
v                  634         6980          530         >20.4
b                  560         7617          350         >21.3
u                  305         7594          756         >20.7
w1                 683         7390          510         >20.9
m2                 658         7185          452         >21.7
w2                 610         6774          490         >20.7

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).
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