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GCN Circular 4452

GRB 060108: VLT J-band observations
2006-01-09T11:26:15Z (18 years ago)
Daniele Malesani at SISSA-ISAS,Trieste,Italy <>
P. D'Avanzo (INAF/OABr), S. Piranomonte (INAF/OAR), D. Malesani (SISSA), 
G. Chincarini (Univ. Milano-Bicocca), L. Stella (INAF/OAR) and G. 
Tagliaferri (INAF/OABr), report on behalf of the MISTICI collaboration:

We observed the field of GRB 060108 (Oates et al., GCN 4443; Sakamoto et 
al., GCN 4445) with the ESO-VLT UT1 equipped with the ISAAC camera, 
starting on Jan 9.307 UT (0.7 d after the GRB). Coaddition of ten 90 s 
exposures does not reveal any object inside the XRT error circle (Page 
et al., GCN 4444) down to a limiting magnitude J = 22.3 (3 sigma 
confidence level).

This limit (see also Guidorzi et al., GCN 4447) implies a faint 
afterglow, as observed in other Swift GRBs. If this faintness is due to 
a Lyman dropout, the non detection in J implies a redshift z > 9.

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