GCN Circular 33289
Subject
GRB 230205A: Swift/UVOT Upper Limits
Date
2023-02-06T20:44:18Z (a year ago)
From
Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>
M.H. Siegel (PSU) and E/ Ambrosi (INAF-IASFPA)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 230205A
100 s after the BAT trigger (Ambrosi et al., GCN Circ. 33271).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 33275)
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 100 250 147 >21.3
u_FC 258 508 246 >20.3
white 100 5198 526 >21.5
v 588 1581 117 >19.5
b 514 1680 117 >20.1
u 258 1481 343 >20.2
w1 638 657 19 >19.2
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.036 in the direction of the burst
(Schlegel et al. 1998).