GCN Circular 29403
Subject
GRB 210205A: Swift/UVOT Upper Limits
Date
2021-02-05T18:16:08Z (3 years ago)
From
Alexander Belles at PSU/Swift <aub1461@psu.edu>
A. Belles (PSU) and S. Dichiara (NASA/GSFC/UMCP)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 210205A
139 s after the BAT trigger (Dichiara et al., GCN Circ. 29397).
No optical afterglow consistent with the XRT position
(Osborne et al. GCN Circ. 29399)
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 >20.5
white 139 4057 344 >20.6
v 4268 4468 197 >19.4
b 3652 5159 265 >20.1
u 297 5084 255 >19.7
w1 4678 4878 197 >19.9
m2 4473 4673 197 >20.8
w2 4063 4263 197 >19.3
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.716 in the direction of the burst
(Schlegel et al. 1998).