GCN Circular 5848
Subject
GRB 061121: Ep,i - Eiso correlation
Date
2006-11-24T00:40:19Z (17 years ago)
From
Lorenzo Amati at INAF-IASF/Bologna <amati@iasfbo.inaf.it>
L. Amati (INAF-IASF Bologna), F. Frontera (Univ.Ferrara and INAF-IASF Bologna),
C. Guidorzi (Univ.Bicocca/INAF and Osservatorio Astronomico di Brera), E.
Montanari (Univ.Ferrara) and M. Della Valle (INAF-Osservatorio Astrofisico di
Arcetri) report:
"Based on the redshift of 1.314 (GCN 5826) and the fluence and spectral
properties of the prompt emission as measured by Konus-Wind (GCN 5837) and
RHESSI (GCN 5838), we estimate for GRB 061121 a total isotropic released
energy, Eiso, of ~(3+/-0.3)x10^(53) erg (1-10000 keV cosmological
rest-frame, H0=65 km/s/Mpc, Omega_m=0.3, Omega_lambda=0.7) and an
intrinsic peak energy, Ep,i, of ~1200+/-400 keV. These values are
consistent with the best fit of the Ep,i-Eiso correlation within ~0.9 -
2.3 sigma (see, e.g., Figure 1 of Amati et al. 2006, astro-ph/0607148v4).
Given that the Konus-Wind and RHESSI spectra were measured during the
brighter and harder portion of the event (~20s), the inclusion in the
spectral analysis of the BAT and XRT data covering the whole prompt
emission (i.e. up to ~120 s from the Swift trigger, see GCN Report 15.1)
may provide a lower value of Ep,i and a slightly higher value of
Eiso, improving the match with the Ep,i-Eiso correlation."
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