GCN Circular 18587

Subject

GRB 151111A: Swift/UVOT upper limits

Event

Date

2015-11-12T13:57:55Z (11 years ago)

From

Massimiliano de Pasquale at IASF-Palermo <m.depasquale@ucl.ac.uk>

M. De Pasquale, S. Emery (UCL-MSSL) and L. M. McCauley (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 151111A
81 s after the BAT trigger (McCauley et al., GCN Circ. 18578Loading...
 
 ).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 18579Loading...
 
 ) 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            81           231          147 >20.9
u_FC                293           543          246 >19.7
white                 81         6778          519 >21.7
v                      622         7094          339 >19.7
b                      549         6573          235 >20.6
u                      293         6367          442 >19.7
w1                    671         6163          216 >20.0
m2                 5757         5957          197 >19.7
w2                   772         6984          413 >20.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).