GCN Circular 19300

Subject

GRB 160410A: further NOT optical observations

Event

Date

2016-04-12T12:35:22Z (10 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 19271Loading...
 
 ) 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 19925Loading...
 
 ) 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.