GCN Circular 37056
Subject
GRB 240805A: Swift/UVOT Upper Limits
Date
2024-08-06T01:34:23Z (7 months ago)
From
Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>
Via
Web form
M. H. Siegel (PSU) and S. Dichiara (PSU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 240805A
105 s after the BAT trigger (Dichiara et al., GCN Circ. 37032).
No optical afterglow consistent with the XRT position
(Osborne, GCN Circ. 37045) 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 initial exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 105 4086 269 >20.4
v 4297 4497 197 >18.7
b 3681 5128 205 >19.5
u 3476 5113 393 >19.5
w1 4708 4908 197 >19.1
m2 4502 4701 197 >19.1
w2 4092 4292 197 >19.1
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.191 in the direction of the burst
(Schlegel et al. 1998).