TITLE:   GCN CIRCULAR
NUMBER:  22571
SUBJECT: GRB 180329B: LCO FTS observations
DATE:    18/03/31 11:57:19 GMT
FROM:    Cristiano Guidorzi at Ferrara U,Italy  <guidorzi@fe.infn.it>

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 LCO 2-m unit Faulkes Telescope South in Siding Springs began 
observing Swift GRB 180329B (Racusin et al. GCN 22558) on March 30, 
08:56 UT (0.78 days since the GRB) with the SDSS-R filter. We detect the 
optical afterglow (Racusin et al.; Perley et al. GCN 22562) with the 
following magnitude:

Mid Time from GRB  Exposure       Filter       Magnitude (AB)
(days)             (s)
-------------------------------------------------------------
0.79               5x120          SDSS-R       20.14 +- 0.21
-------------------------------------------------------------

as calibrated against nearby Pan-STARRS objects.