GCN Circular 14180
Subject
GRB 130131A: Swift/UVOT Upper Limits
Event
Date
2013-02-02T15:19:38Z (13 years ago)
From
Mike Siegel at PSU/Swift MOC <siegel@swift.psu.edu>
M. H. Siegel and D. Grupe (PSU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 130131A
68 s after the BAT trigger (Grupe et al., GCN Circ. 14156).
No optical afterglow consistent with the optical position (Tanver et al.,
GCN Circ 14157) or XRT position (Evans et al., GCN Circ. 14160)
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 68 217 147 >21.8
u_FC 280 529 246 >20.8
white 68 7570 839 >22.5
v 609 18681 1378 >21.0
b 535 7369 549 >21.7
u 280 13670 1434 >22.0
w1 658 12906 1434 >21.7
m2 1932 18851 1263 >21.3
w2 758 17768 1336 >22.0
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).