GCN Circular 22717
Subject
GRB 180512A: Swift/UVOT Upper Limits
Date
2018-05-13T10:53:43Z (6 years ago)
From
Paul Kuin at MSSL <npkuin@gmail.com>
N. P. M. Kuin (UCL-MSSL) and Deich (PSU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 180512A
218 s after the BAT trigger (Deich et al., GCN Circ. 22710). No optical
afterglow consistent with the XRT position (Evans et al. GCN Circ. 22715)
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 218 368 147 >21.1
white 218 4358 344 >21.2
v 5986 6120 132 >19.0
b 3953 4153 197 >20.7
u 3748 16254 422 >20.7
w1 3543 16019 1107 >20.3
m2 9380 10280 886 >20.9
w2 5781 5981 197 >20.1
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).