[vsnet-grb-info 3383] GRB 060604: redshift
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Mon Jun 5 21:25:45 JST 2006
TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 5218
SUBJECT: GRB 060604: redshift
DATE: 06/06/05 12:24:51 GMT
FROM: Alberto Castro-Tirado at Inst.de Astro. de Andalucia <ajct at iaa.es>
A. J. Castro-Tirado, P. Amado (IAA-CSIC Granada),
I. Negueruela (U. de Alicante), J. Gorosabel, M. JelĂnek
and A. de Ugarte Postigo (IAA-CSIC),
report:
"We have observed the optical afterglow of GRB 060604 (Page et al.
GCN Circ. 5212) with the 2.5m Nordic Optical telescope (+ALFOSC)
at Observatorio del Roque de los Muchachos (La Palma). Observations
consisted of a 150 s V-band exposure with showed a faint object at
the location of the proposed Swift/UVOT candidate, in agreement with
Tanvir et al. (GCN Circ. 5216), plus a 1200 s exposure spectrum
covering the range 3200-9100 A with the grism#4. Based on the presence
of a strong continuum break around 4475 A which we identify as due to
Ly-alpha, we estimate a redshift of z = 2.68. Further analysis is in
progress"
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