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GCN Circular 16210

Subject
GRB 140502A: Swift/UVOT Upper Limits
Date
2014-05-03T11:43:15Z (10 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S. R. Oates (IAA-CSIC,UCL-MSSL) and C. A. Swenson (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 140502A
75 s after the BAT trigger (Swenson et al., GCN Circ. 16202). Two bright 
USNO-B1 sources lie close to the XRT location, with R magnitudes of 13.48 
and 13.61, lie within 3 and 9 arcseconds, respectively of the XRT position 
(Goad et al., GCN Circ. 16206). Neither of these sources are observed to 
vary significantly over the duration of the initial UVOT observations.

Ppreliminary 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            75          225          147         >16.0
u_FC               287          537          246         >16.3
white               75         5702          525         >16.0
v                  616         6113          432         >15.0
b                  543        11919          337         >16.0
u                  287        11811         1347         >16.3
w1                 666        17270         1642         >17.9
m2                4681        16734         1262         >20.0
w2                 593         5908          432         >18.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 2.97 in the direction of the burst
(Schlegel et al. 1998).
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