GCN Circular 16210
Subject
GRB 140502A: Swift/UVOT Upper Limits
Event
Date
2014-05-03T11:43:15Z (11 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).