GCN Circular 21110
Subject
GRB 170510A: LCO Siding Springs early observations
Date
2017-05-19T13:47:40Z (7 years ago)
From
Cristiano Guidorzi at Ferrara U,Italy <guidorzi@fe.infn.it>
C. Guidorzi (U. Ferrara), S. Kobayashi, I.A. Steele (LJMU), A. Gomboc
(U. Nova Gorica), C.G. Mundell (U. Bath), A. Cucchiara, D. Morris, B.
Gendre (U. of Virgin Islands) on behalf of a large collaboration report:
We began observing Fermi GRB 170510A (Bissaldi et al. GCN 21081) on May
10, 12:14 UT (7.0 hours since the GRB) with a 1-m LCO unit with the SDSS
i filter. Within the Swift-XRT error circle (Cholden-Brown et al. GCN
21103) we clearly detect the optical afterglow candidate (Cucchiara et
al. GCN 21087; Lipunov et al. GCN 21091) at the following position:
RA(J2000) = 10:40:36.89
DEC(J2000)= -39:12:45.2
with an error radius of 1.0", with the following value:
Mid Time Exposure Filter Magnitude (AB)
(hours) (s)
-------------------------------------------------------
7.1 5x120 SDSS-I 18.60 +- 0.07
-------------------------------------------------------
as calibrated against nearby UCAC4 stars.