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We describe the TIFR Near Infrared Spectrometer and Imager (TIRSPEC) designedand built in collaboration with M/s. Mauna Kea Infrared LLC, Hawaii, USA, nowin operation on the side port of the 2-m Himalayan Chandra Telescope (HCT),Hanle (Ladakh), India at an altitude of 4500 meters above mean sea level. TheTIRSPEC provides for various modes of operation which include photometry withbroad and narrow band filters, spectrometry in single order mode with longslits of 300" length and different widths, with order sorter filters in the Y,J, H and K bands and a grism as the dispersing element as well as a crossdispersed mode to give a coverage of 1.0 to 2.5 microns at a resolving power Rof ~1200. The TIRSPEC uses a Teledyne 1024 x 1024 pixel Hawaii-1 PACE arraydetector with a cutoff wavelength of 2.5 microns and on HCT, provides a fieldof view of 307" x 307" with a plate scale of 0.3"/pixel. The TIRSPEC wassuccessfully commissioned in June 2013 and the subsequent characterization andastronomical observations are presented here. The TIRSPEC has been madeavailable to the worldwide astronomical community for science observations fromMay 2014.

TIRSPEC : TIFR Near Infrared Spectrometer and Imager