ABSTRACT. We present multi-band results for GRB071010B based on Swift, Suzaku, and ground-based optical observations. This burst is an ideal target to evaluate the robustness of the E ^src _peak – E _iso and E ^src _peak – E _γ relations, whose studies have been in stagnation due to the lack of the combined estimation of E ^src _peak and long-term optical monitoring. The joint prompt spectral fitting using Swift/Burst Alert Telescope and Suzaku/Wide-band All-sky Monitor data yielded the spectral peak energy as E ^src _peak of 86.5^+6.4 _–6.3 keV and E _iso of 2.25^+0.19 _–0.16 × 10⁵² erg with z = 0.947. The optical afterglow light curve is well fitted by a simple power law with temporal index α = –0.60 ± 0.02. The lower limit of temporal break in the optical light curve is 9.8 days. Our multi-wavelength analysis reveals that GRB071010B follows E ^src _peak – E _iso but violates the E ^src _peak – E _γ and E _iso – E ^src _peak – t ^src _jet at more than the 3σ level.

Key words: gamma rays: bursts; gamma rays: observations

Print publication: Issue 1 (2009 November 20)
Received 2009 June 2, accepted for publication 2009 October 21
Published 2009 November 5