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GCN Circular 22534

GRB 180325A: prompt LT observations
2018-03-25T03:05:01Z (6 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 
180325A (Troja et al. GCN 22532) on March 25, 01:55:25 UT (143 seconds 
since the GRB trigger time) with the RINGO3 polarimeter and the IO:O 
camera in the SDSS-R filter. We clearly detect the optical afterglow 
(Troja et al.) with the following magnitude:

Mid Time from GRB�� Exposure������������ Filter������������ Magnitude (AB)
(min)�������������������������� (s)
35.1���������������������������� 6x10�������������������� SDSS-R������������ 19.02 +- 0.05

as calibrated against nearby SDSS objects.
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