GCN Circular 8780
Subject
GRB 090102: optical decay
Event
Date
2009-01-05T12:15:18Z (17 years ago)
From
Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst <malesani@astro.ku.dk>
D. Malesani, J. P. U. Fynbo (DARK/NBI), A. de Ugarte Postigo (ESO), J.
Gorosabel (IAA/CSIC), S. Barros, E. Simpson (QUB), report on behalf of a
larger collaboration:
We observed the afterglow of GRB 090102 (Mangano et al., GCN 8762; Klotz
et al., GCN 8761) with the Nordic Optical Telescope equipped with
ALFOSC, at several epochs. The decay in the R band is consistent with a
single power law with slope alpha ~ 0.9 between 0.1 and 3 days after the
GRB. This is in agreement with the early-time slopes reported by Afonso
et al. (GCN 8771) and Cenko et al. (GCN 8773). There is marginal
indication that the light curve may flatten at late times, which could
be due to the presence of a host galaxy. Further observations are
encouraged.
A plot with the light curve, including data from GROND (GCN 8771), P60
(GCN 8773), and IAC80 (de Ugarte Postigo et al., GCN 8772) is posted at
the following URL:
http://www.astro.ku.dk/~malesani/GRB/090102/lc.png
[GCN OPS NOTE(05jan09): Per author's request, the Klotz reference
was changed from 8762 to 8761.]