Optical observations and multiband modelling of the afterglow of GRB041006 : Evidence of a hard electron energy spectrum

Kuntal Misra1, L. Resmi1,3, S. B. Pandey1, D. Bhattacharya2 and R. Sagar1
1Aryabhatta Research Institute of Observational Sciences, Manora Peak, Nainital 263 129, India
2Raman Research Institute, Bangalore 560 080, India

Abstract. We present the CCD Cousins R band photometric observations of the afterglow of GRB 041006. The multiband afterglow evolution is modelled using an underlying `hard' electron energy spectrum with a p1 ~ 1.3. The burst appears to be of very low energy (E ~ 1048 ergs) concerned to a narrow cone of opening angle theta ~ 2.3o The associated supernova is compared with SN1998bw and is found to be brighter..

Keywords :Gamma-ray bursts, GRB afterglows, flux decay, spectral index

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