Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999arep...43..580k&link_type=abstract
Astronomy Reports, Volume 43, Issue 9, September 1999, pp.580-586
Astronomy and Astrophysics
Astronomy
3
Scientific paper
Four pairs of cosmic gamma-ray bursts (GRBs) from the Fourth BATSE Catalog (Tr 1993/Tr 0658, Tr 1956/Tr 1733, Tr 2799/Tr 0493, and Tr 3173/Tr 2834) can be identified as candidates for gravitationally lensed objects with time delays from 55 to 946 days based on the similarity of their profiles and durations. Objects of galactic masses (~10^11 M_solar) are considered as a gravitational-lens model. However, these bursts do not satisfy two essential criteria: the delayed burst should be weaker, and the spectra of the two lensed components should be identical. It is therefore concluded, as in earlier studies, that there is no firm evidence for the existence of gravitationally lensed GRBs (which would provide an irrefutable argument that they are at cosmological distances). This may be due to the fact that large delay times correspond to large brightness ratios for the images, which substantially decrease the probability of detection. Since roughly 2/3 of bursts are "missed" by the BATSE detector, it is still worthwhile to continue searches for gravitationally lensed GRBs.
Komberg Boris V.
Kurt Victoria G.
Kuznetsov Alexander Vasilievich
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