GCN Circular 19860
Subject
GRB 160824A: Swift/UVOT Possible Afterglow Detection
Event
Date
2016-08-25T14:25:28Z (10 years ago)
From
Frank Marshall at GSFC <femarsha@khamseen.gsfc.nasa.gov>
F. E. Marshall (NASA/GSFC) and P. A. Evans (U. Leicester)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 160824A
101 s after the BAT trigger (Evans et al., GCN Circ. 19855).
UVOT marginally detects a source consistent with the enhanced XRT position
(Goad et al. GCN Circ. 19857)
in the initial UVOT exposure with the white filter.
The preliminary analysis produces the following marginal detection
and 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373):
Filter T_start(s) T_stop(s) Exp(s) Mag
white 101 787 186 20.16 +/- 0.27
v 645 837 39 >17.9
b 571 763 39 >18.7
u 313 738 265 >19.7
w1 694 714 19 >18.5
m2 669 861 39 >19.2
w2 620 813 39 >18.5
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.69 in the direction of the burst
(Schlegel et al. 1998).