[vsnet-grb-info 17887] GRB 160422A: Swift/UVOT Candidate Afterglow
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sat Apr 23 09:49:33 JST 2016
TITLE: GCN CIRCULAR
NUMBER: 19333
SUBJECT: GRB 160422A: Swift/UVOT Candidate Afterglow
DATE: 16/04/23 00:48:34 GMT
FROM: Frank Marshall at GSFC <femarsha at khamseen.gsfc.nasa.gov>
F. E. Marshall (NASA/GSFC)
reports on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 160422A
32624 s after the LAT trigger (Mailyan et al., GCN Circ. 19327).
A candidate optical afterglow
is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 02:48:22.79 = 42.09497 (deg.)
Dec (J2000) = -57:52:30.4 = -57.87511 (deg.)
with an estimated uncertainty of 0.45 arc sec. (radius, 90% confidence).
Preliminary detections 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 33427 34064 627 19.71 +/- 0.07
u 32624 33420 783 19.05 +/- 0.11
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).
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