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The Photo-z InfraRed Telescope (PIRT) is an instrument on the Gamow Explorer,currently proposed for a NASA Astrophysics Medium Explorer. PIRT works intandem with a companion wide-field instrument, the Lobster Eye X-ray Telescope(LEXT), that will identify x-ray transients likely to be associated with highredshift gamma-ray bursts (GRBs) or electromagnetic counterparts togravitational wave (GW) events. After receiving an alert trigger from LEXT, thespacecraft will slew to center the PIRT field of view on the transient source.PIRT will then begin accumulating data simultaneously in five bands spanning0.5 - 2.5 microns over a 10 arc-minute field of view. Each PIRT field willcontain many hundreds of sources, only one of which is associated with the LEXTtransient. PIRT will gather the necessary data in order to identify GRB sourceswith redshift $z > 6$, with an expected source localization better than 1arcsec. A near real-time link to the ground will allow timely follow-up as atarget of opportunity for large ground-based telescopes or the James Webb SpaceTelescope (JWST). PIRT will also allow localization and characterization of GWevent counterparts. We discuss the instrument design, the on-board dataprocessing approach, and the expected performance of the system.

cornell university

The Photo-z Infrared Telescope (PIRT) -- a space instrument for rapid  follow up of high-redshift gamma-ray bursts and electromagnetic counterparts  to gravitational wave events