X-ray and radio bright type Ic SN 2002ap -- a hypernova without an   associated GRB
  Combined X-ray (0.3 -10 keV) and Radio (0.61 and 1.42 GHz) observations of the type Ic SN 2002ap are used here, to determine the origins of the prompt X-ray and Radio emission from this source.Our analysis of the XMM-Newton observations suggests that the prompt X-ray emission originates from inverse Compton scattering of photospheric thermal emission by energetic electrons. We also compare the early radiospheric properties of SN 2002ap with those of SN 1998bw (type Ic) and SN 1993J (type IIb), to contrast the prompt emission from a GRB associated SN with other supernovae without GRB counterparts. 
F. K. Sutaria (1), A. Ray (2) and P. Chandra (2,3) ((1) The Open   University, Milton Keynes, U.K., (2) Tata Institute of Fu...