GRB 081008: From Burst To Afterglow And The Transition Phase In Between

dc.contributor.utaustinauthorWheeler, J. Craigen_US
dc.creatorYuan, F.en_US
dc.creatorSchady, Patriciaen_US
dc.creatorRacusin, J. L.en_US
dc.creatorWillingale, R.en_US
dc.creatorKruhler, T.en_US
dc.creatorO'Brien, P. T.en_US
dc.creatorGreiner, J.en_US
dc.creatorOates, S. R.en_US
dc.creatorRykoff, E. S.en_US
dc.creatorAharonian, F.en_US
dc.creatorAkerlof, C. W.en_US
dc.creatorAshley, M. C. B.en_US
dc.creatorBarthelmy, S. D.en_US
dc.creatorFilgas, R.en_US
dc.creatorFlewelling, H. A.en_US
dc.creatorGehrels, N.en_US
dc.creatorGogus, E.en_US
dc.creatorGuver, T.en_US
dc.creatorHorns, D.en_US
dc.creatorKiziloglu, U.en_US
dc.creatorKrimm, H. A.en_US
dc.creatorMcKay, T. A.en_US
dc.creatorOzel, M. E.en_US
dc.creatorPhillips, A.en_US
dc.creatorQuimby, Robert M.en_US
dc.creatorRowell, G.en_US
dc.creatorRujopakarn, W.en_US
dc.creatorSchaefer, B. E.en_US
dc.creatorVestrand, W. T.en_US
dc.creatorWheeler, J. Craigen_US
dc.creatorWren, J.en_US
dc.description.abstractWe present a multi-wavelength study of GRB 081008, at redshift 1.967, by Swift, ROTSE-III, and Gamma-Ray Burst Optical/NearInfrared Detector. Compared to other Swift GRBs, GRB 081008 has a typical gamma-ray isotropic equivalent energy output (similar to 10(53) erg) during the prompt phase, and displayed two temporally separated clusters of pulses. The early X-ray emission seen by the Swift X-Ray Telescope was dominated by the softening tail of the prompt emission, producing multiple flares during and after the Swift Burst Alert Telescope detections. Optical observations that started shortly after the first active phase of gamma-ray emission showed two consecutive peaks. We interpret the first optical peak as the onset of the afterglow associated with the early burst activities. A second optical peak, coincident with the later gamma-ray pulses, imposes a small modification to the otherwise smooth light curve and thus suggests a minimal contribution from a probable internal component. We suggest the early optical variability may be from continuous energy injection into the forward shock front by later shells producing the second epoch of burst activities. These early observations thus provide a potential probe for the transition from the prompt phase to the afterglow phase. The later light curve of GRB 081008 displays a smooth steepening in all optical bands and X-ray. The temporal break is consistent with being achromatic at the observed wavelengths. Our broad energy coverage shortly after the break constrains a spectral break within optical. However, the evolution of the break frequency is not observed. We discuss the plausible interpretations of this behavior.en_US
dc.description.sponsorshipNASA NNX-08AN25G, NAS5-00136, NNX-08AV63G, PHY-0801007en_US
dc.description.sponsorshipAustralian Research Councilen_US
dc.description.sponsorshipUniversity of New South Walesen_US
dc.description.sponsorshipUniversity of Texasen_US
dc.description.sponsorshipUniversity of Michiganen_US
dc.description.sponsorshipLeibniz-Prize HA 1850/28-1en_US
dc.identifier.citationYuan, F., P. Schady, J. L. Racusin, R. Willingale, T. Kr�hler, P. T. O'Brien, J. Greiner et al. "GRB 081008: from burst to afterglow and the transition phase in between." The Astrophysical Journal, Vol. 711, No. 2 (Mar., 2010): 870.en_US
dc.relation.ispartofserialAstrophysical Journalen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.subjectgamma-ray burst: individual (grb 081008)en_US
dc.subjectgamma-ray bursten_US
dc.subjectswift xrt dataen_US
dc.subjectband spectral evolutionen_US
dc.subjectcomprehensive analysisen_US
dc.subjectoptical observationsen_US
dc.subjectrefreshed shocksen_US
dc.subjectenergy injectionen_US
dc.subjectengine activityen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleGRB 081008: From Burst To Afterglow And The Transition Phase In Betweenen_US
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