OBSERVATIONS OF THE PROMPT GAMMA-RAY EMISSION OF GRB 070125
Eric C. Bellm,1 Kevin Hurley,1 Valentin Pal'shin,2 Kazutaka Yamaoka,3 Mark S. Bandstra,1
Steven E. Boggs,1,4 Soojing Hong,5 Natsuki Kodaka,6 A. S. Kozyrev,7 M. L. Litvak,7
I. G. Mitrofanov,7 Yujin E. Nakagawa,8 Masanori Ohno,9 Kaori Onda,6 A. B. Sanin,7
Satoshi Sugita,3 Makoto Tashiro,6 V. I. Tretyakov,7 Yuji Urata,6 and Claudia Wigger10
1 UC Berkeley Space Sciences Laboratory, 7 GaussWay, Berkeley, CA94720-7450; Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра..
2 Ioffe Physico-Technical Institute, 26 Polytekhnicheskaya, St. Petersburg 194021, Russian Federation.
3 Department of Physics andMathematics, AoyamaGakuinUniversity, 5-10-1 Fuchinobe, Sagamihara, Kanagawa 229-8558, Japan.
4Department of Physics, University of California, Berkeley, CA 94720-7300.
5 Laboratory of Physics, College of Science and Technology, Nihon University, 7-24-1 Narashinodai, Funabashi, Chiba 274-8501, Japan.
6 Department of Physics, Saitama University, 255 Shimo-Ohkubo, Sakura-ku, Saitama, Saitama 338-8570, Japan.
7 Institute for Space Research, Profsojuznaja 84/32, Moscow 117997, Russia.
8 Institute of Physical and Chemical Research (RIKEN), 2-1 Hirosawa,Wako, Saitama 351-0198, Japan.
9 Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency ( ISAS/JAXA), 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan.
10 Paul Scherrer Institute, 5232 Villigen PSI, Switzerland.
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 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 multipeaked emission over a period of about 1 minute. The total burst fluence as observed by Konus is 1.79 × 10−4 ergs cm−2 (20 keV-10 MeV). Using the spectroscopic redshift z = 1.548, we find that the burst is consistent with the "Amati" Epeak,i − Eiso correlation. Assuming a jet opening angle derived from broadband modeling of the burst afterglow, GRB 070125 is a significant outlier to the "Ghirlanda" Epeak,i − Eγ correlation. Its collimation-corrected energy release, Eγ = 2.5 × 1052 ergs, is the largest yet observed.
DOI: doi:10.1086/592136 - http://iopscience.iop.org/0004-637X/688/1/491/
