GCN Circular 15167
Subject
GRB 130831A: Montarrenti Observatory optical follow-up
Event
Date
2013-09-02T12:43:02Z (13 years ago)
From
Simone Leonini at Monarrenti Obs <s.leonini@iol.it>
Simone Leonini, G. Guerrini, P. Rosi and L.M. Tinjaca Ramirez (Montarrenti
Observatory, Siena, Italy) report:
We continue to observe and detect the fading optical afterglow of GRB 130831A
(Swift trigger 568849, Hagen et al., GCN Circ. 15139) with the automatic 0.53m
RC
telescope + U47 detector at Montarrenti Observatory (Siena, Italy, IAU code
C88).
We stacked 4 unfiltered CCD exposures of 60s each and we detect the very faint
OT at the same position previously measured (GCN 15150) obtaining the
following
photometry at t~34h :
2013 Sep. 01.95733 UT R=20.46 +/- 0.24
Magnitudes were obtained using Astrometrica software using USNO-B1 catalogue
for positions and photometry. An ensemble of 66 stars were used for the
magnitude
comparison.