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GCN Circular 22716

GRB 180512A: LT prompt observations
2018-05-13T08:31:12Z (6 years ago)
Cristiano Guidorzi at Ferrara U,Italy <>
C. Guidorzi, R. Martone (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 
180512A (Deich et al. GCN 22710) on May 12, 22:07:15 UT (5.5 minutes 
since the GRB) with the RINGO3 polarimeter and the IO:O camera in the 
SDSS-R filter. Within the enhanced XRT error circle (Evans et al. GCN 
22715) we do not detect any optical counterpart down to the following 

Mid time since GRB�������� Exp�������������� Filter���������������� Magnitude
(hrs)���������������������������������� (s)
0.64���������������������������������� 6x10������������ SDSS-R������������������ > 20.8

as calibrated against nearby SDSS objects.
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