TITLE: GCN CIRCULAR NUMBER: 6405 SUBJECT: GRB 070508: pseudo-z from 4 different spectral analyses DATE: 07/05/10 16:34:08 GMT FROM: Alexandre Pelangeon at LATT,OMP,Toulouse A. Pelangeon & J-L. Atteia (LATT-OMP) report: The intense burst GRB 070508 detected by SWIFT-BAT (Grupe et al., GCNC 6383) was also observed by other spacecrafts. Thanks to the published spectral parameters obtained from the different spectral analyses performed, we have computed 4 pseudo-redshift(**) for this burst. Here are the results (the errors on the pseudo-z are at the 90% c.l.): - From the spectral parameters obtained with the Konus-WIND data (Golenetskii et al., GCNC 6403) we obtain: pz = 1.15 +/- 0.15 - From the spectral parameters obtained with the Swift-BAT data (Barthelmy et al., GCNC 6390; Grupe et al., GCNR 54.1) we obtain: pz = 1.06 +/- 0.30 - From the spectral parameters obtained with the Suzaku-WAM data (Uehara et al., GCNC 6396) we obtain: pz = 1.25 +/- 0.30 - From the spectral parameters obtained with the RHESSI data (Bellm et al., GCNC 6399) we obtain: pz = 2.53 +/- 1.40 These values are compatible with the spectroscopic redshift z=0.82 derived by Jakobsson et al. (GCNC 6398). (**) cf. http://www.ast.obs-mip.fr/grb/pz