The optical afterglow and host galaxy of GRB 000926

J.U. Fynbo, J. Gorosabel, T.H. Dall, J. Hjorth, M.I. Andersen, H. Pedersen, P. Møller, S. Holland, I. Smail, N. Kobayashi, E. Rol, P. Vreeswijk, I. Burud, B.L. Jensen, B. Thomsen, A. Henden, F. Vrba, B. Canzian, J.M.C. Ceron, A.J. Castro-TiradoT. Cline, M. Goto, J. Greiner, M.T. Hanski, K. Hurley, Niels Lund, T. Pursimo, R. Ostensen, J. Solheim, N. Tanvir, H. Terada

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    We present the discovery of the Optical Transient (OT) of the long-duration gamma-ray burst GRB 000926. The optical transient was detected independently with the Nordic Optical Telescope and at Calar Alto 22.2 hours after the burst. At this time the magnitude of the transient was R = 19.36. The transient faded with a decay slope of about 1.7 during the first two days after which the slope increased abruptly (within a few hours) to about 2.4. The light-curve started to flatten off after about a week indicating the presence of an underlying extended object. This object was detected in a deep image obtained one month after the GRB at R = 23.87 +/- 0.15 and consists of several compact knots within about 5 arcsec. One of the knots is spatially coincident with the position of the OT and hence most likely belongs to the host galaxy. Higher resolution imaging is needed to resolve whether all the compact knots belong to the host galaxy or to several independent objects. In a separate paper we present a discussion of the optical spectrum of the OT, and its inferred redshift (Moller et al., in prep.).
    Original languageEnglish
    JournalAstronomy and Astrophysics
    Volume373
    Issue number3
    Pages (from-to)796-804
    ISSN0004-6361
    DOIs
    Publication statusPublished - 2001

    Keywords

    • gamma rays : bursts
    • cosmology : observations

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