GCN Circular 26892
Subject
GRB 200125A: Swift/UVOT Upper Limits
Event
Date
2020-01-27T01:22:25Z (6 years ago)
From
Kira Simpson at PSU <kira.simpson1984@gmail.com>
GRB 200125A: Swift/UVOT Upper Limits
K. K. Simpson (PSU) and A. Y. Lien (GSFC/UMBC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 200125A
179 s after the BAT trigger (Lien et al., GCN Circ. 26876).
No optical afterglow consistent with the XRT position
(Beardmore et al. GCN Circ. 26878)
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 179 329 147 >20.4
white 179 4176 344 >21.1
v 4387 4586 197 >18.4
b 3771 3971 197 >19.9
u 337 414 75 >18.9
w1 4796 4835 38 >18.6
m2 4591 4791 197 >19.3
w2 4182 4382 197 >20.2
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.08 in the direction of the burst
(Schlegel et al. 1998).