This page gives an overview of the instrumentation available on the WHT and INT, and on the TNG as part of the Italian, NL and UK TNG-WHT timeshare programme. It is revised bi-annually to reflect the options offered in each semester. Full information on all the listed instruments is indexed in the Manuals Home Page, and information on older instruments can be found on-line in the Obsolete Instruments section of the Manuals Home Page. A summary of the time allocation process is available here.

ING-TNG Timeshare Programme
As part of an ongoing formal collaboration between ING and TNG which gives the NL and UK communities guaranteed access to an echelle spectrograph, and the Italian community guaranteed access to a multi-object wide-field fibre-fed spectrograph, NL and UK observers may apply to use three TNG instruments. These are:

• The high resolution spectrograph, SARG
• The near infrared camera-spectrometer, NICS, in non-AO spectroscopic mode only
• The multi-object low-resolution optical spectrograph, DOLORES

Italian-based observers may apply to use three WHT instruments. These are:

• The multi-object wide-field fibre-fed spectrograph, AF2+WYFFOS
• The double-arm medium-resolution long-slit spectrograph, ISIS
• The Prime Focus Mosaic Imaging Camera, PFIP

Further details of the timeshare scheme, and how to submit a proposal, are available here.

NAOMI/INGRID and OSCA
Prospective NAOMI/INGRID applicants should read the most recent performance summary. The coronograph, OSCA, is offered in 2006B following a short period of unavailability in 2006A.

NAOMI/OASIS
The Integral Field Spectrograph OASIS is offered with NAOMI on a shared risks basis. Prospective applicants should read the OASIS home page. OASIS may be used both with and without AO.

INGRID at the Cassegrain Focus
INGRID is not offered at the Cass focus in 2006B, but is offered at Nasmyth with the adaptive optics suite. It can also be used at Nasmyth with the AO loop switched off; in this case a guide star is not needed and throughput is reduced by ~0.5 mag compared to that at Cass.

LIRIS
The long-slit intermediate resolution infrared spectrograph, LIRIS, is offered in both imaging and long-slit spectroscopy modes. LIRIS in multi-slit mode is available only in collaboration with the instrument builders; prospective applicants for LIRIS in this mode should contact Dr Arturo Manchado (amt@ll.iac.es) in the first instance.

INTEGRAL
It is expected that INTEGRAL will not be available in Semester 2006B due to essential upgrades to its control-software infrastructure. Prospective applicants to use INTEGRAL are urged to contact Dr Evencio Mediavilla for further information.

ULTRACAM
ULTRACAM will not be offered on the WHT in Semester 2006B. However, it is hoped that it will be offered in Semester 2007A on the INT.

New Visitor Instruments
PIs planning to submit a proposal based on a new (to ING) visitor instrument should follow the procedure for New Visitor Instruments.

IDS on the INT
Semester 2006B sees the return of the Intermediate Dispersion Spectrograph to the INT. IDS is offered with the 235mm camera only, but with the full range of gratings. The WFC and IDS will be scheduled in blocks of at least four weeks' duration each, and the minimum proposal length for either instrument is four nights unless agreed in advance by the Director or Head of Astronomy. Only a small number of instrument changes can be supported on the INT, and consequently large proposals are encouraged to make best use of the available resources.