[vsnet-grb-info 5281] GRB 071021: Z-band detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  6972
SUBJECT: GRB 071021: Z-band detection
DATE:    07/10/22 02:18:51 GMT
FROM:    Daniele Malesani at Niels Bohr Inst,Dark Cosmology Center  <malesani at 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.