GCN Circular 33003
Subject
GCN: GRB 221201A: Swift/UVOT Upper Limits
Date
2022-12-02T13:27:29Z (a year ago)
From
Samantha Oates at MSSL <samantha.oates@alumni.ucl.ac.uk>
S. R. Oates (U.Birmingham) and E. Troja (NASA/GSFC/UMCP)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 221201A
179 s after the BAT trigger (Troja et al., GCN Circ. 32998).
No optical afterglow consistent with the XRT position
(Osborne et al. GCN Circ. 33001)
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 179 329 147 >20.1
white 179 1970 225 >20.2
v 1479 2020 78 >17.8
b 1404 2107 85 >18.8
u 337 2094 277 >19.2
w1 1529 2069 78 >18.4
m2 1504 2045 78 >18.5
w2 1454 1996 78 >18.6
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.066 in the direction of the burst
(Schlegel et al. 1998).