Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...294..177g&link_type=abstract
Astronomy and Astrophysics 294, 177-182 (1995)
Astronomy and Astrophysics
Astrophysics
10
Stars: Flare, Star: S 10933, Gamma-Ray: Bursts
Scientific paper
Spectroscopic observations provide evidence that the optical transient object observed in 1966 on archival plates of Sonneberg Observatory is a B=18.5 dMe star. For an assumed flare duration of 40min. (or longer) the flare amplitude was {DELTA}m_B_=~5.2mag. If the recorded event was belonging to the class of "fast" flares its amplitude could have reached 7-9mag. We estimate a lower limit for the optical flare energy release of 10^35^(d/100 pc)^2^erg/s. We discuss the positional coincidence of this large amplitude flaring star with the error box of the γ-ray burst 1978 October 6B and conclude that the flare star is probably not related to the γ-ray burst. The fact that no other optical flare was found from this object restricts their frequency to be less than 7x10^-4^h^-1^ for amplitudes (in B) greater than 4.5mag. Nevertheless, large amplitude flares constitute a serious background problem for the wide field search for possible optical counterparts of γ-ray bursters.
Greiner Jochen
Motch Ch.
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