GCN Circular 37263
Subject
GRB 240824A: Swift/UVOT Upper Limits
Date
2024-08-24T17:11:31Z (4 months ago)
From
Paul Kuin at MSSL <npkuin@gmail.com>
Via
email
GRB 240824A: Swift/UVOT Upper Limits
N. P. M. Kuin (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 240824A
139 s after the BAT trigger (Cenko et al., GCN Circ. 37254).
No optical afterglow consistent with the BAT position 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 139 289 147 >19.8
u_FC 297 547 246 >19.2
white 139 1717 411 >20.6
v 628 1767 136 >18.7
b 553 1866 136 >19.5
u 297 1841 362 >19.5
w1 677 1817 136 >19.1
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.014 in the direction of the burst
(Schlegel et al. 1998).