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Prompt observation of Gamma Ray Bursts (GRBs) events are unanimously
paramount importance for GRB science and related cosmology.
Such observations at NIR wavelengths are even more promising
allowing one to monitor high-z Ly-alpha absorbed bursts as
well as events occurring in dusty star-forming regions.
REM (Rapid Eye Mount) is a fully robotized alt-az 60-cm fast
equipped with a high throughput NIR (four filters) camera (REMIR) dedicated
to detecting the prompt IR afterglow of GRBs.
A dichroic placed at one of its Nasmith foci splits the beam in two:
one feeds REMIR and the other
ROSS (REM Optical Slitless
REM can discover objects at extremely high redshift and trigger
within minutes large telescopes to observe them.
ROSS will intensively monitor the
prompt optical continuum (450-900 nm) of GRB afterglows via a low dispersion
GRISM. It is also equipped with standard VRI filters and, in the future,
with a polarizer.
REM is placed at La Silla (Chile) and is
collecting images since 2003.
ROSS reforms, via a suitable
fore-optics, a pupil where an AMICI prism
is located. The spectra are then reformed on the focal plane via a
magnification 1 camera. The CCD is a Marconi pre-mounted in a detector
head cooled by a 3-stages Peltier system made by Apogee (model AP47).