GCN Circular 19300
Subject
GRB 160410A: further NOT optical observations
Date
2016-04-12T12:35:22Z (8 years ago)
From
Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst <malesani@dark-cosmology.dk>
D. Malesani (DARK/NBI), D. Xu (NAOC/CAS), T. Kuutma (NOT and Tartu
Obs.), report on behalf of a larger collaboration:
We observed again the optical counterpart of GRB 160410A (Gibson et al.,
GCN 19271) with the Nordic Optical Telescope (NOT) equipped with ALFOSC.
Observations started on April 11.87 UT and consisted of 4x900 s
exposures in the SDSS r band.
At a mid time of 40.37 hr after the GRB, we do not detect any longer the
optical afterglow down to a 3-sigma limiting magnitude of r > 25 (AB),
calibrated against nearby SDSS stars. The corresponding decay index (F
propto t^-alpha) between our two NOT observations (Malesani &
Kirkpatrick, GCN 19925) is constrained to be alpha > 0.9. The object
closest to the GRB position (with r ~ 24) lies 4.7" away, so we cannot
single out any obvious host galaxy candidate to the GRB, down to the
quoted limiting magnitude.