GCN Circular 21825
Subject
GRB 170906A: REM optical/NIR observations
Date
2017-09-06T07:08:29Z (7 years ago)
From
Stefano Covino at Brera Astronomical Observatory <stefano.covino@brera.inaf.it>
S. Covino, D. Fugazza (INAF / OAB) report on behalf of the REM team:
We observed the field of the GRB 170906A (Siegel et al., GCN 21821) with the 60-cm robotic
telescope REM located at the La Silla Observatory (Chile). The observations started at 00:44:23 UT,
about 72 s after the burst, and were carried out simultaneously in the g, r, i, z and H bands.
A preliminary analysis shows that the optical counterpart reported by UVOT (Siegel et al., GCN 21821)
is well detected in all bands and between 2 and 3min after the burst it was:
r = 13.10 +- 0.10 (AB)
H = 12.00 +/- 0.05 (Vega)
Magnitudes are calibrated against the 2MASS catalog in the NIR and the APASS catalogue for the optical.