A burst caught in flagrante

Article Abstract:

The gamma-ray event of 23 January 1999 has been analyzed by Akerlof and colleagues, Kulkarni and colleagues and Galama and colleagues. The GRB990123 burst was the first to be detected optically whilst still emitting gamma-rays, and where a radio afterglow appear after just one day. A robotic optical camera, ROTSE, was used to detection GRB990123, and the optical brightness was measured by Akerlof and colleagues to be in excess of ninth apparent magnitude. The radio emission disappeared the day after appearing, which is unusual as previous afterglows typically remain visible for months.

Research

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Whence Geminga?

Article Abstract:

The Geminga supernova event may have originated in the Orion association. The Orion is a young association and one in which supernovae occur frequently. There is evidence that a supernova occurred there 300,000 years ago. Orion's cloak, an expanding supernova remnant, may have been caused by Orion. The remnant itself may be linked to Orion Id, the youngest subgroup in Orion, with an expansion age of 300,000 years.

Observations, Supernova remnants

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The supernova connection

Article Abstract:

The establishment of the origin of the gamma rays in the universe is examined. The origin and effects of the supernova are also discussed.

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