Giant Metrewave Radio Telescope

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Giant Metrewave Radio Telescope
GMRT antenna at sunset.jpg
An antenna of the Giant Metrewave Radio Telescope at sunset
Organization National Centre for Radio Astrophysics
Location 10 km east of Narayangaon, India
Wavelength radio 50 to 1500 MHz
Built First light 1995
Telescope style array of 30 parabolic reflectors
Diameter 45m
Collecting area 47,713m2
Mounting alt-azimuth fully steerable primary

Giant Metrewave Radio Telescope (GMRT), located near Pune in India, is an array of radio telescopes at metre wavelengths. It is operated by the National Centre for Radio Astrophysics, a part of the Tata Institute of Fundamental Research, Mumbai. At the time it was built, it was the world's largest interferometric array.[1],[2]


The GMRT is located around 80 km north of Pune at Khodad[3](Located 19° 5'47.46"N 74° 2'59.07"E). A nearby town is Narayangaon which is around 9 km from the main telescope site. The office of NCRA is located in the University of Pune campus right next to IUCAA.

Technical information[edit]

Science and Observations[edit]

One of the important aims of the telescope is to search for the highly redshifted 21-cm line radiation from primordial neutral hydrogen clouds in order to determine the epoch of galaxy formation in the universe. Pulsar research is another major area for GMRT study.[4]

Astronomers from all over the world regularly use this telescope to observe many different astronomical objects such as HII regions, galaxies, pulsars, supernovae, and sun and solar winds.


Each year on National Science Day the observatory invites the public and pupils from schools and colleges in the surrounding area to visit the site where they can listen to explanations of radio astronomy, receiver technology and astronomy from the engineers and astronomers who work there. Nearby schools/colleges are also invited to put their individual science experiments in exhibition and the best one in each level (primary, secondary school and Jr. college) are awarded.

Visitors are allowed into GMRT only on Fridays in two sessions - Morning(1100 hrs - 1300 hrs) and Evening (1500 hrs to 1700 hrs). The GMRT is open to the public on National Science Day.

External links[edit]


  1. ^ Ananthakrishnan, S. (1995). "The Giant Metrewave Radio Telescope". Journal of Astrophysics and Astronomy 16: 427–435. Bibcode:1995JApAS..16..427A. 
  2. ^ Ishwara-Chandra, C H; Rao, A Pramesh; Pandey, Mamta; Manchanda, R K; Durouchoux, Philippe (2005). "Low Frequency Radio Observations of GRS1915+105 with GMRT". Chinese Journal of Astronomy and Astrophysics 5 (S1): 87–92. arXiv:astro-ph/0512061. Bibcode:2005ChJAS...5...87I. doi:10.1088/1009-9271/5/S1/87. 
  3. ^ Special Correspondent, (Volume 26 - Issue 26 :: Dec. 19, 2009-Jan. 01, 2010), "A base for progress", Frontline, Retrieved on February 1, 2011
  4. ^ Swarup, Govind. Indian Journal of Radio and Space Physics (ISSN 0367-8393), vol. 19, Oct.-Dec. 1990, p. 493-505.

Coordinates: 19°05′47.46″N 74°02′59.07″E / 19.0965167°N 74.0497417°E / 19.0965167; 74.0497417