GCN Circular 21329
Subject
GRB 170711A: Swift/UVOT Upper Limits
Event
Date
2017-07-12T16:20:43Z (9 years ago)
From
Frank Marshall at GSFC <femarsha@khamseen.gsfc.nasa.gov>
F. E. Marshall (NASA/GSFC) and V. D'Elia (ASDC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 170711A
124 s after the BAT trigger (D'Elia et al., GCN Circ. 21321).
No optical afterglow consistent with the enhanced XRT position
(Beardmore et al. GCN Circ. 21323) 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 initial exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
u_FC 124 374 246 >19.8
v 430 1553 136 >18.9
b 379 1503 156 >19.4
w1 480 1454 97 >19.6
m2 604 1429 58 >18.6
w2 704 1380 78 >19.0
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.31 in the direction of the burst
(Schlegel et al. 1998).