[vsnet-grb-info 4235] GRB 070125: pseudo-z~1.5 from spectral parameters of the prompt emission

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  6033
SUBJECT: GRB 070125: pseudo-z~1.5 from spectral parameters of the prompt emission
DATE:    07/01/26 10:02:22 GMT
FROM:    Jean-Luc Atteia at Lab d Astrophys.,OMP,Toulouse  <atteia at ast.obs-mip.fr>

A. Pelangeon & J-L. Atteia (LATT-OMP) report:

We have used the spectral parameters of GRB 070125
provided by Bellm et al. (GCNC 6025) to compute the spectral 
pseudo-redshift**
of this burst detected by the IPN Network and SWIFT-BAT (Hurley et al., 
GCNC 6024).

We find a pseudo-redshift pz= 1.6 ± 0.8

This pseudo-redshift relies on the assumption that GRB 070125
follows the Amati relation.

If we combine the constraints obtained from the pseudo-z computation
with the spectroscopic constraints given by Prochaska et al.
(GCNC 6031 & 6032), we suggest that the redshift of GRB 070125
is close to z=1.5.


** cf. http://www.ast.obs-mip.fr/grb/pz