GCN Circular 20994
Subject
GRB 170405A: LCO FTN observations
Date
2017-04-06T13:02:36Z (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) on behalf of a large
collaboration report:
We observed Swift GRB 170405A (Troja et al. GCN 20984) on April 06, from
10:23 to 11:01 UT (0.66 to 0.68 days since the GRB) with the 2-m LCO
Faulkes Telescope North with the SDSS i and r filters. We do not detect
the optical afterglow (Troja et al; Malesani et al. GCN 20988; Klotz et
al. GCN 20989; de Ugarte Postigo et al. GCN 20990; Martin-Carrillo et
al. GCN 20991; Mazaeva et al. GCN 20992) down to the following limits:
Mid Time Exposure Filter Magnitude (AB)
(days) (s)
-------------------------------------------------------
0.66 5x120 SDSS-R > 21.6
0.68 4x120 SDSS-I > 21.6
-------------------------------------------------------
as calibrated against nearby Pan-STARRS objects. The nearby Pan-STARRS
object mentioned by Malesani et al. is clearly visible in our stacked
frames.