GRB 000926 and its optical afterglow: Another evidence for non-isotropic emission

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dc.creatorSagar, R.
dc.creatorPandey, S. B.
dc.creatorMohan, V.
dc.creatorBhattacharya, D.
dc.creatorCastro-Tirado, A. J.
dc.date2000-10-11
dc.date2001-01-25
dc.date.accessioned2026-07-25T11:24:08Z
dc.descriptionCCD Johnsons BV and Cousins RI photometric magnitudes are determined for 20 stars in the field of GRB 000926. Using them as calibrators, B and R band light curves are constructed of the afterglow from ours and other published observations. They show a steepening of the flux decay, from a decay constant of 1.4+/-0.1 to 2.6+/-0.06 at about 1.7 days after the burst. Attributing this break to the onset of sideways expansion of a jet-like ejecta, we estimate an initial jet opening angle of ~0.14 radian, and a burst energy of ~10^51 erg. We construct the X-ray-optical-near infrared spectrum of the afterglow and derive a spectral index of ~ -0.9. From the spectrum we also estimate that the source has a rather large intrinsic extinction, amounting to E(B-V)=0.36+/-0.02.
dc.description13 pages, 3 figures, accepted for publication in Bull. Astr. Soc. India
dc.identifierhttps://arxiv.org/abs/astro-ph/0010212
dc.identifierhttp://arxiv.org/abs/astro-ph/0010212
dc.identifierBull. Astr. Soc. India, vol. 29, pp. 1-13 (2001)
dc.identifier.urihttps://dspace.dare.co.zw/handle/123456789/2420
dc.subjectAstrophysics
dc.titleGRB 000926 and its optical afterglow: Another evidence for non-isotropic emission
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