GCN Circular 10038
Subject
GRB091018: Magellan Echellette Observations
Date
2009-10-19T01:49:14Z (15 years ago)
From
Hsiao-Wen Chen at U Chicago <hchen@oddjob.uchicago.edu>
Hsiao-Wen Chen, Jennifer Helsby (UChicago), Stephen Shectman, Ian
Thompson, Jeffrey Crane (Carnegie Observatory) report on behalf of a
larger collaboration:
"We observed the afterglow of GRB091018 reported by Stamatikos et al. (GCN
10034) and confirmed by Schaefer et al. (GCN10036) using the MagE
echellette spectrograph on the Magellan Clay Telescope. The observations
started at UT 00:28 on October 19, 2009, ~ 3.5 hours after the inital
trigger. We obtained 2x900s exposures. Our preliminary reduction shows
that the afterglow spectrum displays strong absorption transitions due to
MgII, FeII, MnII at redshift z=0.971, which we tentatively identify as the
host redsdhift of the GRB.
Further analysis is underway.
This message may be cited."