GCN Circular 18650
Subject
GRB 151127A: Swift/UVOT Upper Limits
Date
2015-11-27T18:22:40Z (8 years ago)
From
Sam Emery at MSSL-UCL <samuel.emery.15@ucl.ac.uk>
S.W.K Emery (UCL-MSSL) and A. D'Ai (INAF-IASFPA)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 151127A
77 s after the BAT trigger (D'Ai et al., GCN Circ. 18643).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 18647)
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 77 227 147 >20.8
white 77 1017 295 >21.2
w1 668 6559 452 >20.3
m2 816 6354 432 >20.0
w2 594 18458 1696 >21.3
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.12 in the direction of the burst
(Schlegel et al. 1998).