GCN Circular 27308
Subject
GRB 200303A: Swift/UVOT Upper Limits
Date
2020-03-03T15:21:17Z (4 years ago)
From
Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>
A. A. Breeveld (UCL-MSSL) and S. B. Cenko (GSFC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of
GRB 200303A 96 s after the BAT trigger (Cenko et al., GCN Circ. 27297).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 27300) 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 96 246 147 >20.7
u_FC 308 558 246 >20.4
white 96 5034 550 >21.5
v 1219 1238 19 >18.4
b 1144 1163 19 >19.4
u 308 558 246 >20.4
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).