GCN Circular 26070
Subject
GRB 191024A: Swift/UVOT Upper Limits
Date
2019-10-24T16:21:03Z (5 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 191024A 833 s after the BAT trigger
(Page et al., GCN Circ. 26063).
No optical afterglow consistent with the XRT position (Beardmore et al., GCN Circ. 26064) 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 833 982 147 >21.2
white 833 13531 360 >22.0
v 989 6893 274 >19.9
b 1087 13389 1043 >21.6
u 1062 19531 716 >21.3
w1 1038 19072 1160 >21.1
m2 6898 7098 197 >20.2
w2 1137 1506 39 >19.7
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of
E(B-V) = 0.02 in the direction of the burst (Schlegel et al. 1998).