Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...241l..21g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 241, no. 1, Jan. 1991, p. L21-L24.
Astronomy and Astrophysics
Astrophysics
2
Eclipsing Binary Stars, Emission Spectra, Gamma Ray Bursts, Pulsars, Cosmic Rays, Stellar Luminosity, Stellar Orbits
Scientific paper
An episode of pulsed emission of ultra-high energy, greater than 10 to the 14th eV, radiation from the eclipsing binary millisecond pulsar, PSR 1957 + 20, lasting 57 minutes has been detected on January 30, 1987 using the EAS array at Ooty. Arrival times for showers observed during this burst, when folded with the 1.607 millisecond period of the pulsar, show evidence for pulsation of the episodic flux. These observations correspond to a transient flux of 8 x 10 to the -11th/sq cm per sec at energies greater than 10 to the 14th eV and a luminosity of 2 x 10 to the 35th ergs/sec. The episode occurred near the orbital phase of Lagrange point L4.
Gupta Kumar S.
Rajeev M. R.
Sreekantan B. V.
Srivatsan R.
Tonwar Suresh C.
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