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GCN Circular 22033

GRB 171020A: LT observations
2017-10-21T06:30:48Z (7 years ago)
Cristiano Guidorzi at Ferrara U,Italy <>
C. Guidorzi (U. Ferrara), S. Kobayashi (LJMU), C.G. Mundell (U. Bath), 
A. Gomboc (U. Nova Gorica), I.A. Steele (LJMU) on behalf of a large 
collaboration report:

The 2-m Liverpool Telescope automatically began observing Swift GRB 
171020A (Page et al. GCN 22028) on October 20, 23:10:12 UT (3.0 minutes 
from the GRB trigger time) with the RINGO3 polarimeter and the IO:O 
camera in the SDSS-R filter. We clearly detect the optical afterglow 
(Malesani et al, GCN 22029; Moskvitin et al., GCN 22031) with the 
following magnitude:

Mid Time���������� Exposure������������ Filter������������ Magnitude (AB)
(min)�������������������� (s)
35.8���������������������� 6x10���������������� SDSS-R������������ 21.12 +- 0.14

as calibrated against nearby Pan-STARRS objects.
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