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Off-axis emission from the beamed afterglow of gamma-ray bursts and a possible interpretation of slowly declining X-ray afterglow of grb980425

Jul, 1999
7 pages
Published in:
  • Astrophys.J.Lett. 522 (1999) L101
e-Print:
DOI:
Report number:
  • YITP-99-44
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Abstract: (arXiv)
A formula for off-axis emissions from the beamed afterglow of GRBs in a synchrotron model is derived. The formula is applied to an inhomogeneous circumstellar matter obeying n proportional to 1/r**2 suggested for SN1998bw/GRB980425. The slow decline rate as well as the X-ray flux similar to the observed values are obtained for appropriate choice of the parameters so that the association of GRB980425 with SN1998bw is further strengthened.
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