GCN Circular 33774
Subject
GRB 230510A: Swift/UVOT Observations
Date
2023-05-11T22:28:10Z (a year ago)
From
Alexander Belles at PSU <aub1461@psu.edu>
A. Belles (PSU) and R. A. J. Eyles-Ferris (U Leicester)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 230510A
72 s after the BAT trigger (Eyles-Ferris et al., GCN Circ. 33752).
A source consistent with the XRT position (Evans et al., GCN Circ. 33756)
is detected in the initial UVOT exposures.
Preliminary detections and 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
wh_FC 72 222 150 18.90+/-0.10
u_FC 284 318 34 18.09+/-0.32
wh 4413 4613 200 19.33+/-0.11
v 4824 5024 200 18.97+/-0.32
b 4209 5690 241 19.31+/-0.17
u 5439 5638 199 19.10+/-0.24
w1 5234 5434 200 19.30+/-0.34
m2 5029 5228 199 >19.21
w2 4619 4819 200 >19.45
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.144 in the direction of the burst
(Schlegel et al. 1998).