The Rapidly Flaring Afterglow of the Very Bright and Energetic GRB 070125

Adria C. Updike; Josh B. Haislip; Melissa C. Nysewander; Andrew S. Fruchter; D. Alexander Kann; Sylvio Klose; Peter A. Milne; G. Grant Williams; Weikang Zheng; Carl W. Hergenrother; Jason X. Prochaska; Jules P. Halpern; Nestor Mirabal; John R. Thorstensen; Alexander J. van der Horst; Rhaana L. C. Starling; Judith L. Racusin; David N. Burrows; N. P. M. Kuin; Peter W. A. Roming; Eric Bellm; Kevin Hurley; Weidong Li; Alexei V. Filippenko; Cullen Blake; Dan Starr; Emilio E. Falco; Warren R. Brown; Xinyu Dai; Jinsong Deng; Liping Xin; Yulei Qiu; Jianyan Wei; Yuji Urata; Domenico Nanni; Elisabetta Maiorano; Eliana Palazzi; Giuseppe Greco; Corrado Bartolini; Adriano Guarnieri; Adalberto Piccioni; Graziella Pizzichini; Federica Terra; Kuntal Misra; B. C. Bhatt; G. C. Anupama; X. Fan; L. Jiang; Ralph A. M. J. Wijers; Daniel E. Reichart; Hala A. Eid; Ginger Bryngelson; Jason Puls; R. C. Goldthwaite; Dieter H. Hartmann

doi:10.1086/590236

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The Astrophysical Journal Volume 685 Number 1

Adria C. Updike et al. 2008 ApJ 685 361 doi:10.1086/590236

The Rapidly Flaring Afterglow of the Very Bright and Energetic GRB 070125

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Adria C. Updike¹, Josh B. Haislip², Melissa C. Nysewander³, Andrew S. Fruchter³, D. Alexander Kann⁴, Sylvio Klose⁴, Peter A. Milne⁵, G. Grant Williams⁶, Weikang Zheng⁷, Carl W. Hergenrother⁸, Jason X. Prochaska⁹, Jules P. Halpern¹⁰, Nestor Mirabal¹⁰, John R. Thorstensen¹¹, Alexander J. van der Horst¹², Rhaana L. C. Starling¹³, Judith L. Racusin¹⁴, David N. Burrows¹⁴, N. P. M. Kuin¹⁵, Peter W. A. Roming¹⁴, Eric Bellm¹⁶, Kevin Hurley¹⁶, Weidong Li¹⁷, Alexei V. Filippenko¹⁷, Cullen Blake¹⁸, Dan Starr¹⁷, Emilio E. Falco¹⁹, Warren R. Brown¹⁸, Xinyu Dai²⁰, Jinsong Deng⁷, Liping Xin⁷, Yulei Qiu⁷, Jianyan Wei⁷, Yuji Urata^21,22, Domenico Nanni^23,24, Elisabetta Maiorano²⁵, Eliana Palazzi²⁵, Giuseppe Greco²⁶, Corrado Bartolini²⁶, Adriano Guarnieri²⁶, Adalberto Piccioni²⁶, Graziella Pizzichini²⁵, Federica Terra²³, Kuntal Misra^27,28, B. C. Bhatt²⁹, G. C. Anupama³⁰, X. Fan⁵, L. Jiang⁵, Ralph A. M. J. Wijers³¹, Daniel E. Reichart², Hala A. Eid¹, Ginger Bryngelson¹, Jason Puls¹, R. C. Goldthwaite¹, and Dieter H. Hartmann¹

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¹ Department of Physics and Astronomy, Clemson University, Clemson, SC 29634
² Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599
³ Space Telescope Science Institute, Baltimore, MD 21218
⁴ Thüringer Landessternwarte Tautenburg, D-07778 Tautenburg, Germany
⁵ Steward Observatory, University of Arizona, Tucson, AZ 85721-0065
⁶ MMT Observatory, University of Arizona, Tucson, AZ 85721-0065
⁷ National Astronomical Observatories, Chaoyang District, Beijing 100012, China
⁸ Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721-0092
⁹ University of California Observatories/Lick Observatory, University of California, Santa Cruz, CA 95064
¹⁰ Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027
¹¹ Department of Physics and Astronomy, Dartmouth College, Hanover, NH 03755-3528
¹² NASA Postdoctoral Program Fellow, NSSTC, Huntsville, AL 35805
¹³ Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK
¹⁴ Department of Astronomy and Astrophysics, Pennsylvannia State University, University Park, PA 16802
¹⁵ Mullard Space Science Laboratory/UCL, Holmbury St. Mary, Dorking, Surrey HR5 6NT, UK
¹⁶ University of California, Space Sciences Laboratory, Berkeley, CA 94720-7450
¹⁷ Department of Astronomy, University of California, Berkeley, CA 94720-3411
¹⁸ Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138
¹⁹ Smithsonian Institution, Whipple Observatory, Amado, AZ 85645
²⁰ Department of Physics, Ohio State University, Columbus, OH 43210-1117
²¹ Department of Physics, Saitama University, Shimookubo, Urawa 338-8570, Japan
²² Academia Sinica Institute of Astronomy and Astrophysics, Taipei 106, Taiwan
²³ Second University of Roma "Tor Vergata," Italy
²⁴ INAF/OAR
²⁵ INAF/IASF Bologna, 40129 Bologna, Italy
²⁶ Dipartimento di Astronomia, Universite di Bologna, 40127 Bologna, Italy
²⁷ Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital 263 129, India
²⁸ Inter University Center for Astronomy and Astrophysics, Ganeshkhind, Pune 411 007, India
²⁹ Center for Research and Education in Science and Technology (CREST), Hosakote, Bangalore 562 114, India
³⁰ Indian Institute of Astrophysics, Bangalore 560 034, India
³¹ Astronomical Institute, University of Amsterdam, 1098 SJ Amsterdam, Netherlands

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We report on multiwavelength observations, ranging from X-ray to radio wave bands, of the IPN-localized gamma-ray burst GRB 070125. Spectroscopic observations reveal the presence of absorption lines due to O I, Si II, and C IV, implying a likely redshift of z = 1.547. The well-sampled light curves, in particular from 0.5 to 4 days after the burst, suggest a jet break at 3.7 days, corresponding to a jet opening angle of ~7.0°, and implying an intrinsic GRB energy in the 1-10,000 keV band of around E_γ = (6.3–6.9) × 10⁵¹ ergs (based on the fluences measured by the gamma-ray detectors of the IPN). GRB 070125 is among the brightest afterglows observed to date. The SED implies a host extinction of A_V < 0.9 mag . Two rebrightening episodes are observed, one with excellent time coverage, showing an increase in flux of 56% in ~8000 s. The evolution of the afterglow light curve is achromatic at all times. Late-time observations of the afterglow do not show evidence for emission from an underlying host galaxy or supernova. Any host galaxy would be subluminous, consistent with current GRB host galaxy samples. Evidence for strong Mg II absorption features is not found, which is perhaps surprising in view of the relatively high redshift of this burst and the high likelihood for such features along GRB-selected lines of sight.

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