Off-Axis Emission from the Beamed Afterglow of Gamma-Ray Bursts and a Possible Interpretation of the Slowly Declining X-Ray Afterglow of GRB 980425 | Zendy

Takashi Nakamura | Zendy

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Off-Axis Emission from the Beamed Afterglow of Gamma-Ray Bursts and a Possible Interpretation of the Slowly Declining X-Ray Afterglow of GRB 980425

Author(s) -

Takashi Nakamura

Publication year - 1999

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/312235

Subject(s) - afterglow , gamma ray burst , astrophysics , physics , interpretation (philosophy) , x ray , astronomy , optics , philosophy , linguistics

A formula for off-axis emissions from the beamed afterglow of GRBs in asynchrotron model is derived. The formula is applied to an inhomogeneouscircumstellar matter obeying n proportional to 1/r**2 suggested forSN1998bw/GRB980425. The slow decline rate as well as the X-ray flux similar tothe observed values are obtained for appropriate choice of the parameters sothat the association of GRB980425 with SN1998bw is further strengthened.Comment: 7 pages, Latex, accepted for publication in the Astrophysical Journal Letter

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