GCN Circular 23080
Subject
GRB 180805B: Swift/UVOT Upper Limits
Date
2018-08-05T22:12:32Z (6 years ago)
From
Paul Kuin at MSSL <npkuin@gmail.com>
N. P. M. Kuin (UCL-MSSL) and P. D'Avanzo (INAF-OAB)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of
GRB 180805B 85 s after the BAT trigger (D'Avanzo et al.,
GCN Circ. 23076). No optical afterglow consistent with the
XRT position (Evans et al. GCN Circ. 23077) 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 85 235 147 >20.8
u_FC 297 546 246 >20.2
white 85 1544 392 >21.3
v 626 1421 78 >18.6
b 552 1519 97 >20.0
u 297 546 246 >20.2
w1 675 1470 97 >18.8
m2 1078 1097 19 >17.8
w2 774 1569 78 >19.0
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).