[vsnet-grb-info 18985] GRB 170121B: LCO FTN observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Mon Jan 23 17:42:31 JST 2017
TITLE: GCN CIRCULAR
NUMBER: 20508
SUBJECT: GRB 170121B: LCO FTN observations
DATE: 17/01/23 08:41:54 GMT
FROM: Cristiano Guidorzi at Ferrara U,Italy <guidorzi at fe.infn.it>
C. Guidorzi (U. Ferrara), S. Kobayashi, I.A. Steele (LJMU), A. Gomboc
(U. Nova Gorica), C.G. Mundell (U. Bath) on behalf of a large
collaboration report:
We observed Fermi GRB 170121B (Hamburg et al. GCN 20505) on January 23,
07:21 UT (1.7 days since the GRB) with the 2-m LCO Faulkes Telescope
North in Hawaii with SDSS r and i filters. We do not detect the MASTER
optical counterpart (Lipunov et al. GCN 20502) down to the following limits:
Mid Time Exposure Filter Magnitude (AB)
(days) (s)
-------------------------------------------------------
1.69 2x120 SDSS-R > 21.0
1.69 2x120 SDSS-I > 19.5
-------------------------------------------------------
as calibrated against nearby USNO-URAT1 sources.
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