The optical afterglow and host galaxy of GRB 000926
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https://hdl.handle.net/10037/2039Date
2001-04-11Type
Journal articleTidsskriftartikkel
Author
Østensen, R.; Fynbo, J.U.; Solheim, Jan Erik; Gorosabe, J.; Dall, T.H.; Hjorth, J.; Pedersen, H.; Andersen, M.I.; Møller, P.; Holland, S.; Smail, I.; Kobayashi, N.; Rol, E.; Vreeswijk, P.; Vrba, F.; Burud, I.; Jensen, B.L.; Henden, A.; Thomsen, B.; Canzian, B.; Castro Cer´on, J.M.; Castro-Tirado, A.J.; Cline, T.; Goto, M.; Greiner, J.; Hanski, M.T.; Hurley, K.; Pursimo, T.; Lund, N.; Tanvir, N.; Terada, H.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 (Møller et al. in prep.).
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Astronomy & AstrophysicsMetadata
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