Observations of the Prompt Gamma-Ray Emission of GRB 070125

The long, bright gamma-ray burst GRB 070125 was localized by the Interplanetary Network. We present light curves of the prompt gamma-ray emission as observed by Konus-WIND, RHESSI, Suzaku-WAM, and $\mathit{\text{Swift}}$-BAT. We detail the results of joint spectral fits with Konus and RHESSI data. The burst shows moderate hard-to-soft evolution in its multi-peaked emission over a period of about one minute. The total burst fluence as observed by Konus is $1.79\times {10}^{-4}$ erg/cm${}^2$ (20 keV–10 MeV). Using the spectroscopic redshift $z=1.548$, we find that the burst is consistent with the Amati'' $E_{peak,i}-E_{iso}$ correlation. Assuming a jet opening angle derived from broadband modeling of the burst afterglow, GRB 070125 is a significant outlier to the Ghirlanda’’ $E_{peak,i}-E_{\gamma }$ correlation. Its collimation-corrected energy release $E_{\gamma }=2.5\times {10}^{52}$ ergs is the largest yet observed.