GCN Circular 28613
Subject
GRB 201013A: Swift/UVOT Upper Limits
Date
2020-10-13T19:41:14Z (4 years ago)
From
Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>
A. A. Breeveld (UCL-MSSL) and K. L. Page (U. Leicester)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 201013A 74 s after the BAT trigger
(Page et al., GCN Circ. 28607).
There is a bright optical source (USNO B1.0 1470-0207304) 0.5 arcsec from the enhanced XRT position
(Beardmore et al. GCN Circ. 28608). The magnitudes measured at this position by UVOT are consistent
with those catalogued and thus we do not detect any evidence of an afterglow candidate.
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 74 223 147 >16.8
u_FC 286 535 246 >16.7
white 74 1712 412 >16.8
v 616 1763 136 >16.2
b 541 1686 117 >16.6
u 286 1662 343 >16.7
w1 665 1804 127 >16.6
m2 640 1611 58 >16.7
w2 591 1738 136 >17.1
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of
E(B-V) = 0.05 in the direction of the burst (Schlegel et al. 1998).