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GCN Circular 14543

GRB 130502A: Swift/UVOT Upper Limits
2013-05-03T15:08:05Z (11 years ago)
Alice Breeveld at MSSL-UCL <>
A. A. Breeveld (MSSL-UCL) and E. Troja (NASA/GSFC/UMCP) report on behalf 
of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 130502A 96 
s after the BAT trigger (Troja et al., GCN Circ. 14527).
An optical afterglow consistent with the position of the TNG candidate 
(Malesani et al. GCN Circ. 14531) is detected in the initial white 
exposure. Preliminary magnitude and 3-sigma upper limits using the UVOT 
photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for 
the first white finding chart (FC) exposure and subsequent exposures are:

Filter         T_start(s)   T_stop(s)    Exp(s)     Mag

white_FC         96         246          147        20.90 � 0.3
white           588         608           20        >20.06
u               309         559          246        >20.6
b               564         584           20        >19.25
v              5288        5488          197        >19.81
uvw1           5698        5898          197        >20.16
uvm2           5492        5692          197        >19.96

The magnitudes in the table are not corrected for the Galactic 
extinction due to the reddening of E(B-V) = 0.03 in the direction of the 
burst (Schlegel et al. 1998).
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