GCN Circular 18456
Subject
GRB 151022A: Swift/UVOT Upper Limits
Event
Date
2015-10-23T20:11:49Z (11 years ago)
From
Mike Siegel at PSU/Swift MOC <siegel@swift.psu.edu>
B. G. Balzer (PSU) and P. D'Avanzo (INAF-OAB)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 151022A
304 s after the BAT trigger (D'Avanzo et al., GCN Circ. 18436).
No optical afterglow consistent with the XRT position
(Evans GCN Circ. 18438) 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 304 454 147 >21.2
white 304 7836 902 >22.0
v 461 8247 646 >20.1
b 560 7632 430 >21.0
u 535 7426 430 >21.2
w1 510 12075 553 >19.7
m2 486 8452 646 >20.3
w2 609 8042 627 >20.2
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.56 in the direction of the burst
(Schlegel et al. 1998).