Observations of the Prompt Gamma-Ray Emission of GRB 070125

Abstract

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 \textit{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.

25 pages, 6 figures; accepted for publication in ApJ. Improved spectral fits and energetics estimates

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• A Correlated Study of Optical and X-ray Afterglows of GRBs
• Statistical study of gamma-ray bursts with jet break feature in multi-wavelength afterglow emissions
• The Rapidly Flaring Afterglow of the Very Bright and Energetic GRB 070125
• On the Connection of Gamma-Ray Bursts and X-Ray Flashes in the BATSE and RHESSI Databases
• 'Jet breaks' and 'missing breaks' in the X-Ray afterglow of Gamma Ray Bursts
• Testing Blandford-Znajek mechanism in black hole hyperaccretion flows for long-duration gamma-ray bursts
• Detectability of Planck-Scale-Induced Blurring with Gamma-Ray Bursts