GCN Circular 34351
Subject
GRB 230805B: Swift/UVOT Upper Limits
Date
2023-08-06T18:02:19Z (a year ago)
From
Sam LaPorte at PSU <sjl5346@psu.edu>
Via
legacy email
GRB 230805B: Swift/UVOT Upper Limits
S. J. LaPorte (PSU) and S. B. Cenko (GSFC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 230805B
196 s after the BAT trigger (Cenko et al., GCN Circ. 34339).
No optical afterglow consistent with the XRT position
(Evans et al., GCN Circ. 34345)
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 196 345 147 >20.2
u_FC 354 604 246 >19.5
white 196 1878 284 >20.7
v 683 1927 135 >19.0
b 610 1854 136 >20.4
u 354 1829 363 >19.6
w1 732 1804 117 >19.4
w2 1014 1730 58 >18.8
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).