Gamma Ray Bursters: Dying Cries from the Distant Universe

Details Gamma Ray Bursters: Dying Cries from the Distant Universe Gamma Ray Bursters: Dying Cries from the Distant Universe

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aps..apr..f203k&link_type=abstract

American Physical Society, APS/AAPT Joint April Meeting, April 18-21, 1998 Columbus, Ohio, abstract #F2.03

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A few times a day the sky is briefly lit up by brilliant flashes of gamma rays. This phenomenon was discovered about three decades ago. Yet until recently astronomers knew very little about the nature of these sources. The bursters appear to be istotropic and yet inhomogeneously distributed around us. This requires the bursters to be either local to our Galaxy or at cosmological distances. In 1997, the Italian-Dutch satellite BeppoSAX found that gamma-ray bursters are accompanied by a long-lived X-ray afterglow. Following this, similar and even longer lived optical and radio afterglows were detected. Observations of this afterglow have conclusively demonstrated that the burst of May 5, 1997 must come from cosmological distances. Radio observations find superluminal expansion and deceleration. Thus GRBs are undoubtedly the brightest events in the Universe. However, their origin still remains shrouded in mystery.

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