[vsnet-grb-info 20705] GRB 180620A: LCO McDonald observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Wed Jun 20 21:02:41 JST 2018
TITLE: GCN CIRCULAR
NUMBER: 22803
SUBJECT: GRB 180620A: LCO McDonald observations
DATE: 18/06/20 12:01:56 GMT
FROM: Cristiano Guidorzi at Ferrara U,Italy <guidorzi at fe.infn.it>
C. Guidorzi (U. Ferrara), S. Kobayashi (LJMU), C.G. Mundell (U. Bath),
A. Gomboc (U. Nova Gorica), I.A. Steele (LJMU), A. Cucchiara (U. of
Virgin Islands) on behalf of a large collaboration report:
The LCO 1-m unit at McDonald Observatory began observing Swift GRB
180620A (Evans et al. GCN 22798) on June 20, 08:55 UT (20 min since the
GRB trigger time) with the SDSS griz filters. The optical counterpart
(Evans et al.; Butler et al. GCN 22799; Elenin et al. GCN 22800; Tyurina
et al. GCN 22801) is clearly detected in each individual frame with the
following magnitudes:
Mid Time since GRB Exposure Filter Magnitude
(hrs) (s)
------------------------------------------------------------------
0.349 1x120 SDSS-R 18.63 +- 0.04
0.583 1x120 SDSS-I 18.27 +- 0.04
------------------------------------------------------------------
as calibrated against nearby PanSTARRS objects.
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