GRB 201221D: Swift/UVOT Upper Limits
Abstract
The Swift/UVOT began settled observations of the field of GRB 201221D 92 s after the BAT trigger (Page et al., GCN Circ. 29112). No optical afterglow consistent with the NOT or XRT position (Malesani et al. GCN Circ. 29117; Evans et al. GCN Circ. 29119) 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 92 242 147 >20.3 u_FC 305 554 246 >19.3 white 4047 4247 197 >21.0 v 634 4657 216 >19.2 u 305 5110 282 >19.4 w1 684 5068 216 >19.7 m2 4663 4863 197 >19.5 w2 4253 4453 197 >19.9 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.02 in the direction of the burst (Schlegel et al. 1998).
- Publication:
-
GRB Coordinates Network
- Pub Date:
- December 2020
- Bibcode:
- 2020GCN.29129....1B