GCN Circular 21388
Subject
GRB 170728B: Swift/UVOT Upper Limits
Event
Date
2017-07-30T01:46:56Z (8 years ago)
From
Sam LaPorte at PSU <sjl5346@psu.edu>
GRB 170728B: Swift/UVOT Upper Limits
S. J. Laporte (PSU) and S. B. Cenko (GSFC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 170728B
473 s after the BAT trigger (Cenko et al., GCN Circ. 21371).
No optical afterglow consistent with the optical position
(D'Avanzo et al. GCN Circ. 21373)
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 473 623 147 >19.8
white 473 7867 908 >20.8
v 630 8278 627 >19.6
b 728 14417 1117 >21.3
u 703 13868 1276 >21.2
w1 679 19251 2000 >21.6
m2 6847 18681 1279 >22.1
w2 6437 8073 393 >21.5
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst
(Schlegel et al. 1998).