GCN Circular 17323
Subject
GRB 150120A: Swift/UVOT Upper Limits
Date
2015-01-20T19:56:38Z (9 years ago)
From
Margaret Chester at PSU <chester@swift.psu.edu>
M. M. Chester (PSU) and V. D'Elia (ASDC) report on behalf of
the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 150120A
83 s after the BAT trigger (D'Elia et al., GCN Circ. 17310).
No optical afterglow consistent with the XRT position (Evans et al.
GCN Circ. 17317) 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) exposures and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 83 233 147 >20.6
u_FC 295 545 246 >20.1
white 83 5674 461 >21.0
v 624 6085 432 >19.5
b 550 10198 449 >21.0
u 295 6700 658 >20.6
w1 674 6495 432 >20.5
m2 649 6290 432 >21.1
w2 600 5880 432 >20.5
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.10 in the direction of the burst
(Schlegel et al. 1998).