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Limits on the cosmological abundance of supermassive compact objects from a millilensing search in gamma-ray burst
R J Nemiroff1, G F Marani, J P Norris
1Michigan Technological University, Department of Physics, 1400 Townsend Drive, Houghton, Michigan 49931, USA.
Physical Review Letters
|February 15, 2001
Abstract:
A new search for the gravitational lens effects of a significant cosmological density of supermassive compact objects (SCOs) on gamma-ray bursts (GRBs) has yielded a null result. We inspected the timing data of 774 BATSE-triggered GRBs for evidence of millilensing: repeated peaks similar in light-curve shape and spectra. Our null detection leads us to conclude that, in all candidate universes simulated, Omega(SCO)<0.1 is favored for SCO masses in the range 10(5)