GCN Circular 18405
Subject
GRB 151006A: Swift/UVOT Upper Limits
Event
Date
2015-10-06T19:03:04Z (11 years ago)
From
Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>
A. A. Breeveld (UCL-MSSL) and D. Kocevski (NASA/GSFC/ORAU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 151006A 36
s after the BAT trigger (Kocevski et al., GCN Circ. 18398).
No optical afterglow consistent with the XRT position (Goad et al. GCN
Circ. 18403) 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 58 208 147 >20.7
u_FC 271 521 246 >19.9
white 58 6351 520 >21.4
v 36 6754 437 >19.8
b 527 6146 236 >20.3
u 271 5941 442 >20.3
w1 5537 5736 197 >19.8
m2 625 5531 235 >19.7
w2 577 6557 432 >20.4
The magnitudes in the table are not corrected for the Galactic
extinction due to the reddening of E(B-V) = 0.24 in the direction of the
burst (Schlegel et al. 1998).