A possible TeV gamma-ray burst from Hercules X-1 with pulsations at X-ray period

Details A possible TeV gamma-ray burst from Hercules X-1 with pulsations at X-ray period A possible TeV gamma-ray burst from Hercules X-1 with pulsations at X-ray period

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...252l..16r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 252, no. 1, Dec. 1991, p. L16-L18.

Astronomy and Astrophysics

Astronomy

5

Gamma Ray Astronomy, Pulsars, X Ray Stars, Binary Stars, Stellar Radiation

Scientific paper

A 15-minute-long episode of pulsed gamma-ray emission has been detected from Her X-1 on 1988 June 12. The observed pulsation period of (1.23762 +/-0.00015)s is statistically indistinguishable from the contemporary X-ray period. The 35d phase for the episode is 0.02, showing that it has occurred near the expected onset time of the 'HIGH-ON' state in the X-ray flux. The 1.7d orbital phase for the burst is 0.66. The time-averaged flux has been estimated to be (4.7 +/-1.2) x 10 exp -10/sq cm s at energies equal to or greater than 3 TeV.

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