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

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

2000-10-11

arxiv.org/abs/astro-ph/0010212v2

Bull. Astr. Soc. India, vol. 29, pp. 1-13 (2001)

Astronomy and Astrophysics

Astrophysics

13 pages, 3 figures, accepted for publication in Bull. Astr. Soc. India

Scientific paper

CCD 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.

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