Author Topic: PSLV-XL C30 - ASTROSAT, LAPAN-A2, NLS-14, 4xLEMUR - Sept 28, 2015 (04:30 UTC)  (Read 63102 times)

Offline vyoma

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AstroSat rules out afterglow in black hole merger

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Recently US-based LIGO group announced having detected gravitational waves emanating from the merger of two massive black holes located nearly 3 billion light years away. Simultaneously, Hawaii-based ATLAS group identified a fading glow from the part of the sky where these black holes were roughly estimated to lie. The group surmised that this was an electromagnetic (light based) afterglow emanating from the merger. ISRO’s space observatory, AstroSat, however, has, with extremely sensitive measurements, ruled out the possibility that this has any connection with the black hole merger.

In collaboration with the GROWTH (Global Relay of Observatories Watching Transients Happen) network of observatories, AstroSat team has concluded that this event is due to a gamma ray burst.

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The discovery was made with the help of the Cadmium Zinc Telluride Imager (CZTI), an x-ray telescope aboard AstroSat.

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The burst of light, dubbed ATLAS17aeu, appeared to Varun Bhalerao of IIT Bombay, who leads the searches for transients and explosive sources, to have come from a burst that took place on January 5 and not January 4, the date on which the signal from the black hole merger was picked up by the LIGO detectors. “I shot off a mail to my student Sujay, asking him to search for a burst in CZTI data in the calculated time window. And then I noticed an email from Vidushi [another student] in my inbox: She had found the burst I was looking for,” Dr Bhalerao is quoted as saying in a press release circulated by the AstroSat team. CZTI had indeed recorded a gamma ray outburst on January 5. Named GRB170105A, this outburst had happened about 21 hours after the detection of the gravitational wave signal, thereby dissociated from the signal detected by LIGO.
« Last Edit: 06/18/2017 05:21 AM by vyoma »

Offline vyoma

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http://www.isro.gov.in/update/03-aug-2017/astrosat-completing-10000th-orbit-today

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Aug 03, 2017

AstroSat is completing 10,000th Orbit today
The first Indian Multi-wavelength Space Observatory, AstroSat is successfully completing 10,000th  Orbit today at 23:49 Hrs (IST).

AstroSat is in orbit for 676 days and has observed more than 360 celestial sources.

Offline vyoma

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« Last Edit: 09/29/2017 06:11 PM by vyoma »

Offline vyoma

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http://www.isro.gov.in/update/28-sep-2017/astrosat-completes-2-years-orbit

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AstroSat Completes 2 years in Orbit

The first dedicated Indian Astronomy mission, AstroSat which was launched on September 28, 2015 completed two years in orbit. In order to commemorate two years completion of AstroSat in orbit, ISRO organised an “AstroSat Science Meet” during September 26 – 27, 2017.

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