[vsnet-grb-info 18559] GRB 160821A: Maisoncelles observatory optical observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Fri Oct 7 08:07:24 JST 2016
TITLE: GCN CIRCULAR
NUMBER: 20007
SUBJECT: GRB 160821A: Maisoncelles observatory optical observations
DATE: 16/10/06 23:05:54 GMT
FROM: Alain Klotz at IRAP-CNRS-OMP <Alain.Klotz at free.fr>
Soulier J.-F. (Observatoire de Maisoncelles, France) repports:
I imaged the field of GRB 160821A detected by SWIFT
(trigger 709351) with the Newtonian 30cm F/3.8 telescope
located at the Maisoncelles observatory, France (IAU C10).
I detected the optical transcient described by Gendre et al.
(GCNC 19832) at the following position (+/- 0.5 arcsec):
RA(J2000.0) = 11h 25m 01.83s
DEC(J2000.0) = +42d 20' 06.5"
Filter T_start(d) T_stop(d) Exp(s) R
None 0.992 1.008 1440 18.6
None 4.992 4.008 1440 >20
Taking account for the magnitude provided by Gendre et al.
(GCNC 19832) I derived an optical decay alpha=0.78 for the
first day.
Magnitudes were estimated with the nearby UCAC-4 stars
and are not corrected for galactic dust extinction.
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