Multicolor Observations of the GRB 000926 Afterglow

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dc.contributor.authorPrice, P. A.
dc.contributor.authorHarrison, F. A.
dc.contributor.authorGalama, T. J.
dc.contributor.authorReichart, D. E.
dc.contributor.authorAxelrod, T. S.
dc.contributor.authorBerger, E.
dc.contributor.authorBloom, J. S.
dc.contributor.authorBusche, J.
dc.contributor.authorCline, T.
dc.contributor.authorDiercks, A.
dc.contributor.authorDjorgovski, S. G.
dc.contributor.authorFrail, D. A.
dc.contributor.authorGal-Yam, A.
dc.contributor.authorHalpern, J.
dc.contributor.authorHoltzman, J. A.
dc.contributor.authorHunt, M.
dc.contributor.authorHurley, K.
dc.contributor.authorJacoby, B.
dc.contributor.authorKimble, R.
dc.contributor.authorKulkarni, S. R.
dc.contributor.authorMirabal, N.
dc.contributor.authorMorrison, G.
dc.contributor.authorOfek, E.
dc.contributor.authorPevunova, O.
dc.contributor.authorSari, R.
dc.contributor.authorSchmidt, B. P.
dc.contributor.authorTurnshek, D.
dc.contributor.authorYost, S.
dc.date.accessioned2020-09-09T18:21:05Z
dc.date.available2020-09-09T18:21:05Z
dc.date.issued2001-02-26
dc.description.abstractWe present multicolor light curves of the optical afterglow of gamma-ray burst (GRB) 000926. Beginning ~1.5 days after the burst, the light curves of this GRB steepen measurably. The existence of such achromatic breaks is usually taken to be an important observational signature that the ejecta are not expanding isotropically but rather have a collimated jetlike geometry. If we interpret the data in this context, we derive an opening angle of 5°, which reduces the energy release compared with an isotropic model by a factor of ~275, to 1.7 × 10⁵¹ ergs. To fit the data with a simple jet model requires extinction along the line of sight. The derived AV is in the range 0.11-0.82 mag, depending on the adopted extinction law and whether the electrons giving rise to the optical emission are undergoing synchrotron cooling or not. Since this is in excess of the expected extinction from our Galaxy, we attribute this to the GRB host. We note that this extinction is typical of a galactic disk, and therefore the event likely took place in the disk of its host.en_US
dc.description.sponsorshipWe thank the staff of the Palomar, Keck, MDM, and Wise Observatories and also L. Cowie, A. Barger, R. Ellis, C. Steidel, and B. Madore for their assistance in obtaining observations. We thank E. Mazets and the Konus team for the IPN data. F. A. H. acknowledges support from a Presidential Early Career award. S. R. K., S. G. D., and J. P. H. thank NSF for support of their ground-based GRB programs. K. H. is grateful for Ulysses support under JPL contract 958056 and NEAR support under NAG5-9503.en_US
dc.description.urihttps://iopscience.iop.org/article/10.1086/319152en_US
dc.format.extent4 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2i3wi-gcsg
dc.identifier.citationP. A. Price et al., Multicolor Observations of the GRB 000926 Afterglow, ApJ 549 L7 (2001), doi: https://doi.org/10.1086/319152en_US
dc.identifier.urihttps://doi.org/10.1086/319152
dc.identifier.urihttp://hdl.handle.net/11603/19623
dc.language.isoen_USen_US
dc.publisherIOPen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department Collection
dc.relation.ispartofUMBC Joint Center for Earth Systems Technology (JCET)
dc.relation.ispartofUMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rightsPublic Domain Mark 1.0*
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleMulticolor Observations of the GRB 000926 Afterglowen_US
dc.typeTexten_US

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