GCN Circular 29071
Subject
GRB 201216C: Swift/UVOT Upper Limits
Event
Date
2020-12-17T11:19:46Z (5 years ago)
From
Samantha Oates at MSSL <samantha.oates@alumni.ucl.ac.uk>
S. R. Oates (U.Birmingham) and A. P. Beardmore (U. Leicester)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 201216C
2970 s after the BAT trigger (Beardmore et al., GCN Circ. 29061).
No optical afterglow consistent with the enhanced XRT position
(Osborne et al. GCN Circ. 29067) or the VLT position
(Izzo et al., GCN Circ. 29066) 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 2970 3120 147 >20.0
white 2970 3739 344 >20.7
v 3950 4150 197 >19.1
b 3334 3534 197 >19.9
u 3129 3329 197 >19.3
m2 4154 4331 174 >19.3
w2 3745 3945 197 >19.7
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.05 in the direction of the burst
(Schlegel et al. 1998).