On the non-occurrence of Type I X-ray bursts from the Black Hole   Candidates
  It has been justifiably questioned that if the Black Hole Candidates (BHCs) have a ``hard surface'' why Type I X-ray bursts are not seen from them (Nayayan, R., Black Holes in Astrophysics, New J. Phys., 7, 199-218, 2005). It is pointed out that a ``physical surface'' need not always be ``hard'' and in could be ``gaseous'' in case the compact object is sufficiently hot (Mitra, A., The day of reckoning: the value of the integration constant in the vacuum Schwarzschild solution, physics/0504076, p1-p6; BHs or Eternally Collapsing Objects: A review of 90 years of misconceptions, in Focus on Black Hole Research, Nova Sc. Pub., NY, p1-p94, 2006). Even if a ``hard surface'' would be there, presence of strong strong intrinsic magnetic field could inhibit Type I X-ray burst from a compact object as is the case for Her X-1. Thus, non-occurrence of Type I bursts actually rules out those alternatives of BHs which are either non-magnetized or cold and, hence, is no evidence for existence of Event Horizons (EHs). On the other hand, from the first principle, we again show that the BHCs being uncharged and having finite masses cannot be BHs, because uncharged BHs have a unique mass M=0. Thus the previous results that the so-called BHCs are actually extremely hot, ultramagnetized, Magnetospheric Eternally Collapsing Objects (MECOs) (Robertson, S. & Leiter, D., Astrophys. J. 565, 447-451, 2002; MECO Model of galactic BH Candidates and active galactic nuclei, in: New Developments in BLack Hole Research, NOva Sc. Pub., NY, p1-p44, 2006) rather than anything else get reconfirmed by non-occurrence of Type I X-ray bursts in BHCs. 
Abhas Mitra