[vsnet-chat 2631] Re: GRB 991216

[Taichi Kato <tkato>]

Re: [vsnet-chat 2630] GRB 991216

> When GRB 991216, one of the greatest GRBs of BATSE, bursted, Japan was 
> at night and just after Geminids meteor shower's peak.
> 
> Takema Hashimoto was observing meteors around the area of the GRB. He
> recorded a bright meteor appearing around that time, however, he did
> not find any bursting object at that time. He is one of the
> experienced meteor observers. Perhaps, he could have found it if the
> GRB had reached to 3 mag or 4 mag or brighter.

   This observations provides one of the most useful visual upper limits
at the T_0.  Even ROTSE has a delay of 10 sec or more to respond, this
upper limit may provide unique information of the emission mechanism of
the GRB optical flash.  And this should provide a certain limit to the
contribition of GRB flashes to "stationary meteors", which has long been
proposed.

Regards,
Taichi Kato

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