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

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 Eγ = (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 AV < 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.

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

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