The afterglow and complex environment of the optically dim burst GRB 980613

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dc.creatorHjorth, Jens
dc.creatorThomsen, Bjarne
dc.creatorNielsen, Svend R.
dc.creatorAndersen, Michael I.
dc.creatorHolland, Stephen T.
dc.creatorFynbo, Johan U.
dc.creatorPedersen, Holger
dc.creatorJaunsen, Andreas O.
dc.creatorHalpern, Jules P.
dc.creatorFesen, Robert
dc.creatorGorosabel, Javier
dc.creatorCastro-Tirado, Alberto
dc.creatorMcMahon, Richard G.
dc.creatorHoenig, Michael D.
dc.creatorBjörnsson, Gunnlaugur
dc.creatorAmati, Lorenzo
dc.creatorTanvir, Nial R.
dc.creatorNatarajan, Priyamvada
dc.date2002-05-08
dc.date.accessioned2026-07-07T02:03:36Z
dc.date.available2026-07-07T02:03:36Z
dc.descriptionWe report the identification of the optical afterglow of GRB 980613 in R- and I-band images obtained between 16 and 48 hours after the gamma-ray burst. Early near-infrared (NIR) H and K' observations are also reported. The afterglow was optically faint (R ~ 23) at discovery but did not exhibit an unusually rapid decay (power-law decay slope alpha < 1.8 at 2 sigma). The optical/NIR spectral index (beta_RH < 1.1) was consistent with the optical-to-X-ray spectral index (beta_RX ~ 0.6), indicating a maximal reddening of the afterglow of ~0.45 mag in R. Hence the dimness of the optical afterglow was mainly due to the fairly flat spectral shape rather than internal reddening in the host galaxy. We also present late-time HST/STIS images of the field in which GRB 980613 occurred, obtained 799 days after the burst. These images show that GRB 980613 was located close to a very compact, blue V = 26.1 object inside a complex region consisting of star-forming knots and/or interacting galaxy fragments. Therefore, GRB 980613 constitutes a strong case for the association of cosmological gamma-ray bursts with star-forming regions.
dc.description22 pages, 5 figures, ApJ, in press
dc.identifierhttps://arxiv.org/abs/astro-ph/0205126
dc.identifierhttp://arxiv.org/abs/astro-ph/0205126
dc.identifierAstrophys.J. 576 (2002) 113-119
dc.identifierdoi:10.1086/341624
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/4441
dc.subjectAstrophysics
dc.titleThe afterglow and complex environment of the optically dim burst GRB 980613
dc.typetext

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