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GCN Circular 6972

Subject
GRB 071021: Z-band detection
Date
2007-10-22T02:18:51Z (17 years ago)
From
Daniele Malesani at Niels Bohr Inst,Dark Cosmology Center <malesani@astro.ku.dk>
D. Malesani (DARK), S. Piranomonte (INAF/OARm), G. Tagliaferri, G. 
Chincarini, S. Covino (INAF/OABr), F. Fiore, L. Stella (INAF/OAR), 
report on behalf of the MISTICI collaboration:

We observed the field of GRB 071021 (Sakamoto et al., GCN 6958) with the 
8.2m VLT+FORS2 equipped with the z_Gunn filter (effective wavelength: 
9100 A; FWHM: 1300 A).

In a coadded image totalling 15 min exposure, we see a weak source at 
the coordinates provided by Castro-Tirado et al. (GCNs 6968, 6971).

Our detection would suggest a redshift less than roughly 6.5.

A finding chart is poste at:

http://www.astro.ku.dk/~malesani/GRB/071021/071021_finder.jpg

We acknowledge excellent support from the ESO staff, particularly Hugues 
Sana.
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