GRB 170531B: CrAO confirmation of the afterglow
Abstract
We observed the field of the GRB 170531B (Evans et al.,GCN 21171) with with Zeiss-1000/Koshka telescope starting on May 31 (UT) 22:32:32, i.e. ~30 minutes after burst onset. We took several images in filter R with exposures of 180 s. Near the border of XRT error circle (Evans et al.,GCN 21171) we detect the source in coordinates (J2000) 19:07:31.67 -16:25:09.3 with uncertainity of 0.5 arcsec in both coordinates. The source is probably coincedent with the object reported by (Lipunov et al., GCN 21172). The source is fading from R=19.1 at (UT) 22:32:32 down to R=19.5 at (UT) 23:30:56. Most probably the source is an afterglow of GRB 170531B.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- June 2017
- Bibcode:
- 2017GCN.21174....1P