[vsnet-grb-info 18649] GRB 161022A: Swift/UVOT Upper Limits
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sun Oct 23 01:49:05 JST 2016
TITLE: GCN CIRCULAR
NUMBER: 20097
SUBJECT: GRB 161022A: Swift/UVOT Upper Limits
DATE: 16/10/22 16:48:34 GMT
FROM: Lea Hagen at PSU <lea.zernow.hagen at gmail.com>
L. M. Z. Hagen (PSU) and M. Stamatikos (OSU/NASA/GSFC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 161022A
137 s after the BAT trigger (Stamatikos et al., GCN Circ. 20087). No
optical afterglow consistent with the XRT position (Evans et al. GCN
Circ. 20094) 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 early exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 137 1544 539 >21.25
u 296 1668 333 >19.90
b 551 1692 99 >19.27
v 627 1421 97 >18.34
uvw1 676 1644 116 >18.86
uvm2 824 1272 38 >17.99
uvw2 602 1570 116 >19.10
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.04 in the direction of the burst
(Schlegel et al. 1998).
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