GCN Circular 18393
Subject
Trigger 657564 / GRB 151004A: Swift/UVOT Upper Limits
Date
2015-10-05T12:13:24Z (9 years ago)
From
Massimiliano de Pasquale at IASF-Palermo <m.depasquale@ucl.ac.uk>
M. De Pasquale (UCL-MSSL) and S. B. Cenko (GSFC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of
the trigger 657564 (possible GRB 151004A) 3613 s after the
BAT trigger (Cenko et al., GCN Circ. 18389).
No optical afterglow consistent with the BAT position
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 3613 3763 147 >20
white 3613 4994 344 >20.3
v 3770 5404 393 >18.7
b 4590 4789 197 >19.2
u 4384 4584 197 >18.9
w1 4179 4379 197 >19.0
m2 3974 5565 350 >19.3
w2 5000 5200 197 >19.1
The magnitudes in the table are not corrected for the heavy Galactic
extinction due to the reddening of E(B-V) = 1.03 in the direction of
the burst (Schlegel et al. 1998).
--
Dr. Massimiliano De Pasquale
Research associate - Swift UVOT scientist
Mullard Space Science Laboratory, University College London