GCN Circular 13152
Subject
GRB 120327A: NOT optical observations
Date
2012-03-28T05:38:24Z (12 years ago)
From
Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst <malesani@dark-cosmology.dk>
Daniele Malesani (DARK/NBI), Johan P. U. Fynbo (DARK/NBI), Pall
Jakobsson (Univ. Iceland), Jens Jessen-Hansen (NOT and Univ. Aarhus),
Jyri Lehtinen (NOT and Univ. Helsinki), report:
We observed the optical afterglow of GRB 120327A (Sbarufatti et al., GCN
13123) with the NOT equipped with ALFOSC in imaging mode. Observations
were carried out in the R band, for a total exposure time of 30 min,
with a seeing of 1.2".
The optical afterglow is well detected in our images taken at a mean
epoch of March 28.164 UT (1.05 days after the GRB), with a magnitude R =
21.8+-0.16 calibrated against nearby USNO-B1 stars (R1 magnitudes).
This value is in fair agreement with the extrapolation of the R-band
data reported in the literature (LaCluyze et al., GCN 13127; Klotz et
al., GCNs 13124, 13132; Sudilovsky et al., GCN 13129; Gorosabel et al.,
GCN 13130; Im et al., GCN 13140; Meehan et al., GCN 13144). The
afterglow has faded following a single power-law decay with slope alpha
= 1.3 between 12 min and 1 day after the GRB, though small-scale
variability may be present (see also LaCluyze et al., GCN 13127).