GRB 130831A: detection of the optical afterglow and follow-up

 

GRB 130831A: 1.0599 Sept. 2013

GRB 130831A: 1.0599 Sept. 2013

The night between 31 Aug and 1 Sept. was particularly fruitful for the Virtual Telescope Project. While spectroscopy and photometry of several targets were ongoing, we tried to observe the optical counterpart of GRB 130831A.

For this, several 300 seconds unfiltered exposures were taken with the PlaneWave 17″ robotic unit, easily recording the afterglow. Photometry and astrometry were promptly performed and shared with the GRB community via the  Nasa’s Gamma-ray Coordinates Network (GCN).

Above is the average of 10 of those images and the preliminary analysis was published in the GCN 15152 circular

The next night we tried again to spot the afterglow, of course knowing it could be not easy, because of its decaying brightness. We were lucky enough to see it again, quite faint, as in the image below, with photometry reported on GCN 15166.

GRB 130831A: 1.9197 Sept. 2013

GRB 130831A: 1.9197 Sept. 2013

 

The object is placed at about 8.8 billions of light years from us, as inferred by its redshift.

 

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