GCN Circular 6974
Subject
GRB 071021: Magellan i-band observation
Event
Date
2007-10-22T03:51:39Z (19 years ago)
From
Edo Berger at Princton U <eberger@astro.princeton.edu>
E. Berger (Princeton/OCIW) and R. Covarrubias (LCO) report:
"We observed the XRT error circle of GRB 071021 (GCNs 6963,6966) in the
i-band using the LDSS3 instrument on the Magellan/Clay telescope. In a
coadded image of 1120 sec we do not detect any object within the XRT error
circle to a 3-sigma limit of i>23 mag.
Since no z-band magnitude was reported in GCN 6972 we cannot determine
whether our limits are significantly deeper. However, our non-detection
in r- and i-band appears to indicate a redshift of z~6-6.5 (for i-band
effective wavelength = 7600A and FWHM = 1300A). Further observations are
in progress."