GCN Circular 9078
Subject
GRB 090401B: NOT optical observations
Date
2009-04-01T22:10:33Z (15 years ago)
From
Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst <malesani@astro.ku.dk>
D. Malesani, J.P.U. Fynbo (DARK/NBI), J. Heidt (Heidelberg), T. Liimets
(Tartu Observatory), T. Pursimo (NOT), and P. Jakobsson (Univ. Iceland),
report on behalf of a larger collaboration:
We observed the optical afterglow of GRB 090401B (Schady et al., GCN
9066; Schady & Oates, GCN 9067), also detected by AGILE (Moretti et al.,
GCN 9069; Giuliani et al., GCN 9075). Observations were carried out in
the R band with the Nordic Optical Telescope, starting on April 1.870
UT, 12.3 hr after the GRB.
In a single 300 s exposure, the afterglow is clearly detected, with a
magnitude R ~ 22.2 +- 0.1, referred to USNO-B1 stars in the neighbourhood.
We acknowledge excellent support from the NOT visiting observers and staff.