[vsnet-grb-info 20552] GRB 180418A: LCO FTN afterglow confirmation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22648
SUBJECT: GRB 180418A: LCO FTN afterglow confirmation
DATE:    18/04/18 07:47:13 GMT
FROM:    Cristiano Guidorzi at Ferrara U,Italy  <guidorzi at 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 Faulkes Telescope North (Hawaii) began observing Swift short 
GRB 180418A (D'Elia et al. GCN 22646) on April 18, 07:18:19 UT (34 
minutes since the GRB) with the SDSS-I filter. We clearly detect the 
optical afterglow (Zheng et al. GCN 22647) with the following magnitude:

Mid time since GRB     Exp        Filter         Magnitude
(hrs)                  (s)
------------------------------------------------------------
0.62                   5x60       SDSS-I         19.2 +- 0.1
------------------------------------------------------------

as calibrated against nearby SDSS objects.