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ASTROSAT Sends First Space Telegram to ISRO

Indian Space Research Organisation has received the first astroronomer’s telegram (Atel no. 8185) from the Scanning Sky Monitor (SSM) observations oard the first astronomy satellite Astrosat.

"The first Astroronomer’s telegram (Atel no. 8185) on SSM observations of GRS 1915+105 released on 18 October 2015," said ISRO in its statement on October 19. The Scanning sky Monitor (SSM) was pointed to GRS 1915+105 and caught it exhibiting the ‘beta’ class of variability on 14 October 2015.

The Soft X-ray Telescope (SXT) door was opened successfully on October 15, 2015 and its camera door will be opened on October 25.. It will observe the sky however after the camera door is made open which will be after about 10 days.

The High voltage of Near UV, Visible channel and Far UV channel of the UV Imaging telescope (UVIT) was switched ON and detectors tested with low gain and found satisfactory and put back in OFF condition (16 and 17 Oct. 2015).

The SSM was pointed to "GRS 1915+105", an X-ray binary star system which features a regular star and a black hole, and caught it exhibiting the ‘beta’ class of variability on October 14, one of the many types of variability this source exhibits, some of which are associated with its spectral states.

ASTROSAT hit news with its image of Crab Nebula on October 9, using the Cadmium Zinc Telluride Imager (CZTI) instrument. The Crab Nebula is the brightest hard X-ray source in the sky and it has reportedly spotted Cygnus X-1, a black hole source too.

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