Evolution Of The Color Indices Of The GRBS Optical Aftergrow Associated With Supernovae

This paper includes four chapters. In the first chapter we introduce the observation properties and basic theories of GRBs. In the second chapter we introduce the basic theories of supernovae and their association with GRBs. In the third chapter we introduce our work about the evolution of color indices of GRB/SN, and give our prospects to the future research in the fourth chapter.Gama-Ray bursts are divided to two classes based on their duration. The one whose duration longer than 2 seconds are long GRBs, while the one whose duration shorter than 2 seconds are short GRBs. According to the stander theory, long GRBs come from collapse of massive stars and the short GRBs are from the merge of compact stars. While explosion theory of supernovae consider that the Ib/c and II type supernovae are also come from collapse of massive star, this imply that long GRBs and supernovae have the same origin. The observed association of GRB and supernova comfirm this theory. To date,17 supernovae associated with GRB(GRB/SN) in good spectrum comfirmation have been found, we select 14 that have good observed optical data to research their color indices evolution statisticaly, and we get some conclusions:the color indices don’t vary very much at the eary age(afterglow dominant) which resemble the behavior seen in the ensemble of OAs of 17 long GRBs with no supernovae determined by Simon (Simon et al.2001), and begin to turn red intensively as the supernova arise. We find some color indices bump at early age which, through analyze, maybe due to the cooling radiation of the shock breakout, if this is true, it may provide support to the present supernova explosion theory, we find four events with such color indices bumps. We find the peak time of supernova light curve are eralier than the peak time of color indices. We also plot the relations of GRB’s isotropy energy and peak luminosity of supernova, relations of the light curve peak time color indices value and GRB’s isotropy energy, relations of the light curve peak time color indices value and peak luminosity of supernova, no intense correlations have been found.