The deadline for the submission of GTC, TNG, INT, NOT, Stella, LT, and Mercator proposals for Spanish CAT night observing time for semester 2023A is Monday, 3 October 2022, at 22:59 h Canarian local time (23:59 CEST, 21:59 UT). The call for collaborative proposals between Spanish and University of Florida astronomers at the GTC (Spanish/UF Time, see below) is also open, with the same deadline.
We recall that every proposal within the Spanish CAT scheme must be led by a principal investigator (PI) affiliated to an Institution in Spanish soil. GTC Spanish/UF proposals can have either a Spanish or Florida PI, and must include co-Investigators (co-Is) from both communities (see below).
The start and end of the semester change with telescope as illustrated next:
INT, Stella: February – July.
NOT, TNG, Mercator: April – September.
GTC: March – August.
Liverpool (LT): January – August (a two-month overlap period is adopted at the start and end of each semester, when proposals from both semesters may be observed in order to reduce problems with under-filled observations queues).
Large programs requesting observing time with TNG, LT, Mercator, NOT, and/or Stella are accepted. See below.
Proposals requiring visitor mode (including GTC) should include a proper backup scientific program that does not demand good weather conditions. The backup program is also scientifically addressed by the CAT.
The application http://cat.iac.es allows you to request multiple observations using different instruments and telescopes, including GTC, in one single proposal.
Proposals are evaluated at the next meeting of the CAT (November 2022). Recommendations will be made to the Director of the various Observatories/Telescopes in December 2022.
Please, read carefully the following highlights and recommendations made for each telescope and for large programs. There are IMPORTANT changes (e.g.,TNG, instruments unavailability, remote observing at GTC) with respect to previous calls for proposals. Pay special attention to the new (latex, word, pages) form for the preparation of proposals.
To submit proposals, see “how to submit” at the end of this document.
Detailed information about the feature of GTC for this semester is available here.
- OSIRIS (see below), EMIR, and MEGARA are offered in this call.
- OSIRIS is offered at the Cassegrain focus station and with the new monolithic CCD. The arrival of the OSIRIS new monolithic detector is expected in October 2022, but the date of its installation is unknown at the time of writing this call for proposals. OSIRIS “imaging” (broad-band, SHARDS filters, and tunable filters), “spectroscopy” (long-slit, MOS), and “frame transfer and fast photometry” are offered, the latter only in visitor mode. Multi-Object Spectroscopy (MOS) observations will be part of the observing queue only if the proposals are ranked in bands A and B of the Spanish CAT final list. However, any proposal in band C that has the MOS masks already fabricated from previous semesters will be also included in the observing queue (still in band C). Applicants must indicate whether their MOS masks are to be fabricated or are available from previous semesters (there is a box named “masks” in the proposal submission tool).
- The MEGARA integral-field unit (IFU) is offered. The MOS mode will not be offered due to foreseen upgrades on the MOS positioners.
- EMIR is offered on a shared-risk basis. EMIR stand down for instrument maintenance works and installation of the new H2RG detector is planned for late 2022 – early 2023. Any unexpected delay will impact the schedule of 2023A. EMIR is offered with the new H2RG detector. EMIR broad- and narrow-band imaging, long-slit and MOS spectroscopy are the offered observing modes in 2023A. All applicants are recommended to read the instrument manual carefully. Very importantly, the time needed to perform EMIR night-time calibrations (e.g., observations of telluric standard stars, wavelength calibration, etc.) will be charged to the observing programs. Therefore, applicants must include all the time needed to perform theses calibrations together with the time needed for the science observations in the total requested telescope time in their proposals.
- For the calculation of overheads, the GTC Observatory strongly recommends the use of the following Phase 2 simulator. Further information on the calculation of overheads is provided in the GTC call for proposals.
- Visitor programs are very welcome, but will only be admitted whenever they fall in bands A and B. In addition, a backup program (in visitor mode) has to be defined in the case the observing conditions for the main program are not met. C-band proposals requesting visitor mode will be included in the observing queue, but are not admitted as “visitor”. The applicants must clearly indicate if they are applying for visitor mode or “remote visitor mode” (see below).
- Target-of-opportunity (ToO) proposals are accepted (read carefully the ToO policy at GTC and as well as the GTC ToO page for further details). ToO proposals will be recommended with their corresponding priority whenever they fall in bands A and B of the ranked proposal list. ToO proposals in band C will not be approved. ToO proposals do not have carry-over status.
- For all approved proposals (bands A, B, C, and filler), GTC Phase 2 information must be submitted to the GTC at the deadline corresponding to the semester in which the proposal is accepted.
- No “large programs” requiring GTC data are accepted in this call for proposals.
- SPANISH/UF TIME: Up to 1.25% of the GTC observing time is reserved for collaborative proposals between Spanish and University of Florida astronomers. To send proposals under this agreement, select the Special Agreement“Spanish/UF Time” in the CAT application tool.
After publication of the GTC data, all PIs will be contacted by the CAB, CSIC-INTA, archive staff and invited to send their reduced data products for public release to the astronomical community through the GTC archive.
- The Observatory announces that the R. A. range 12 – 14 h is highly over-subscribed, whereas the R. A. interval 19 – 23 h and bright moon time are generally less demanded. Programs that can use bright moon time and/or have targets with R. A. between 19 and 23 h do compete for less oversubscribed telescope time and regions of the sky. They will have higher probability of being executed at the telescope.
- The Observatory encourages users to request Visitor Mode observations provided their programs benefit from this mode. The Observatory has successfully implemented a “flextime” mode intended to increase the efficiency of the visitor programs.
- Starting in semester 2020B, Remote Visitor Mode is also supported at GTC. Users interested in using this mode must declare it by ticking the “Remote visitor mode” button when filling in the electronic form of their proposal.
- Starting in semester 2019A, all proposals (including ToO) will be ranked in bands A, B, C, and filler. Principal Investigators of A-, B-, and C-ranked proposals and filler projects must complete GTC Phase 2 of ALL approved observations in due time. The bands assigned to each proposal are defined as follows:
- A-band proposals have very high priority and all possible efforts will be made to execute all of the required/approved observations in the requested semester. If for any reason, A-band proposals remain unfinished by the end of the corresponding semester, the existing GTC Phase 2 will be granted an extended life-time of two additional semesters, or until its completion, whichever comes first. Unfinished A-band proposals do not have to be re-submitted in the following two semesters because of their carry-over status. Approximately one quarter (according to the CAT ranking) of the total amount of GTC available observing time falls in this band.
- B-band proposals will be executed on a best-effort basis during the requested semester, and do not have a carry-over status. Approximately three quarters (according to the CAT ranking) of the total amount of GTC available observing time falls in this band.
- C-band proposals will be executed in extraordinary cases when no A- or B-band objects are available but the good weather conditions permit observations during the requested semester. C-band proposals do have very little opportunity of execution until completion of the project, yet they are included in the GTC observing queue.
- Filler proposals, see below.
PROTECTED OBJECTS. Due to the execution of Guaranteed Time Observations (GTO) of various instrumental teams, all applicants are kindly requested to check the list of protected objects here (follow the links to the corresponding instrument). Protected objects cannot be proposed for observation by other users, unless an instrumental setup different to that of the GTO is required.
FILLER PROPOSALS: In order to have an efficient queue-scheduled observations scheme for the GTC, it is useful to have a set of “filler” programs that can be executed under adverse observing conditions (bad seeing, poor sky transmission, etc.). Filler proposals can request common-user instruments (EMIR, MEGARA) with simple instrumental configurations (filler proposals should not request complex observations that demand non-standard instrumental modes). These programs must contain targets spanning a wide range in right ascension (RA). Filler proposals will only be executed if the observing conditions do not permit observations of proposals in A-, B-, or C-bands. Proposers may request filler status for their program, and during the proposal selection process CAT will evaluate their suitability for this category. Such proposals can request a large number of observing hours. In order to be considered as filler proposals, they must fulfil the following requirements:
- Their observing requirements should be very relaxed, i.e. little or no restrictions on seeing or cloud coverage.
- The chosen observing mode should be a frequently used mode .
- There is a scientific gain even if only a small fraction of the requested observations are executed.
- A list of targets with a broad R.A. coverage is provided or, if only few targets are included, they must have good visibility during the semester.
- Filler proposals cannot contain Target of Opportunity (ToO) targets.
Note that filler proposals have generally been highly successful in the last semesters.
Filler proposals must be identified by ticking the “filler” box in the proposal submission tool http://cat.iac.es.
- At the time of the release of this call for proposals, it is expected that HARPS-N will be available on the TNG during 2023A. All researchers are thus encouraged to request telescope time with HARPS-N should this instrument be appropriate for their scientific programs. However, the community should be informed that HARPS-N agreement is still under discussion at the moment and the terms of the instrument renewal are not defined as of the date of this release. There is a risk, albeit minimal, that there is no agreement and HARPS-N would be removed from the list of offered instruments in 2023A.
- Objects included in the TNG Protected Target List (GAPS collaboration, AOT47=2023A) cannot be requested.
- The execution of the observations related to the long-term program A44TAC_33, “Hunting for kilonovae in the local Universe with TNG”, may have a significant impact on the schedule of the semester 2023A.
- Monitoring mode is subjected to severe limitations at TNG since the schedule is dominated by long blocks of full-nights belonging to GTO and Italian Large Programs. If helpful, time-sharing with other programs must be agreed before submitting a monitoring proposal. In any case, too dense cadence (like 1 visit per week or less) will be considered not feasible due to scheduling issues.
No time is offered at the WHT in 2023A. To learn about the status of the WEAVE instrument, see more information from the ING call for proposals document and the web page particularly created for providing an update on the ING instrumentation. A special WEAVE open-time call in mid-2023A will be considered.
Detailed information provided by the ING Observatory can be found in the ING call for proposals. All potential applicants must become familiar with the series of changes in instrument availability and of observing time at the WHT and INT driven by the arrival of new survey instruments. The changes are summarized here.
The main changes for 2023A are:
- See the complete list of ING instruments here. Offered instruments are:
- Applicants are encouraged to submit proposals for large time allocations within the semester.
- Large programs (covering various semesters) are not offered in semester 2023A (see below).
- Users should be aware of the instrument changes that will take place in coming semesters for a proper preparation of their INT proposals.
- In semester 2023A, the INT is expected to operate in normal visitor mode. Safety measures to address Covid-19 risks will be adjusted as the pandemic situation changes (see here).
- Inexperienced INT observers MUST be accompanied by an experienced observer. ‘Inexperienced’ here means unable, alone, to make efficient (and safe) use of the observing night, whether from general lack of observing experience, or from lack of experience with the specific techniques/instruments to be used. Observers will be responsible for all aspects of operation, from opening the dome in the evening and operating the telescope and instrumentation throughout the night to parking the telescope and closing the dome at the end of the night.
- The INT offers service mode observing (possible for some programs) through collaboration with the INT student support astronomers. Any additional costs incurred (residencia charges, etc.) will be borne by the PI. If interested in this service, read the ING call for proposals.
Offered common-user instruments (ALFOSC, StanCam, MOSCA, NOTCam, and FIES) and non-common user instruments are listed here. Updates with respect to previous semesters are as follows:
- A set of two holographic diffuser are available to do high-precision photometry with ALFOSC. The diffuser effectively scrambled the incoming light, providing a more constant and optimal (`top-head’) shape, with minimal light loss, significantly reducing any systematic effects in the photometry. The diffusers provides a very stable stellar image with a width (~FWHM) of 5 and 7 arcsec, respectively. Read here for more information.
- The SOFIN high-resolution Echelle spectrograph is again available. It is offered only to do circular spectro-polarimetry with the medium-resolution (R~80,000) camera. SOFIN is not a common-user instrument: only limited support is provided, and explicit approval for a proposal should be obtained.
The instruments WiFSIP and SES are offered:
- WiFSIP: H-alpha (narrow and wide) and H-beta (narrow and wide) are not available.
- SES has no change with respect to previous calls for proposals.
LIverpool Telescope (LT)
- In addition to applying for telescope time through the CAT twice-yearly process, LT now also allows observers to apply for PriorityZ time via: http://telescope.livjm.ac.uk/PropInst/PriorityZ
PriorityZ time is defined as time when there is no A, B or C-ranked science group available for the scheduling software to pick, and so the telescope would otherwise sit idle. This can occur during periods of poor seeing during full moon, or during times of instrument failure. We estimate approximately 10-15 hours of such time are available per month, although this can of course vary significantly. PriorityZ time is well-suited to long-term proposals of bright targets with no significant time constraints. We would typically expect to approve a PriorityZ proposal for a period of two years. Observers can apply via the web form available at the above link, and proposals will be assessed internally by LT staff. Proposals can be submitted at any time.
Check the restrictions and guidance notes for the Liverpool Telescope.
- It is strongly recommended to request long runs and full nights since the Observatory will reduce the number of introduction due to limited local man/womanpower.
- The low-resolution, high stability mode of HERMES is no longer available.
- The high-resolution mode is more efficient, and a double mode in which the object’s spectrum is interleaved with a simultaneous ThArNe exposure is offered. The double mode is intended only for radial velocity work : the background cannot be corrected so if you are interested in the extracted 1D spectrum, you cannot use this mode.
- The exposure time calculator on the web has been updated accordingly with respect to the efficiency of HERMES.
- A new guiding mode on the spectrographic telescope is introduced, which allows now guiding in close visual binaries separated by at least 3 arcsec (the spectrograph’s entrance pinhole diameter). This works for faint companions as well.
- There is a remote observing system, although CAT observers may find it more useful to perform the observations at the Observatory.
Large programs are expected to accommodate projects that require long-term or synoptic coverage, and large-size projects. They must satisfy these four requirements:
- involve novel ideas, opportunities for great advance, or legacy programs,
- span between two and four semesters,
- publicly release their final high-level products in an appropriate format, and
- be led by a Spanish institution (a large fraction of the team should be affiliated to a Spanish institution).
Considering the time allocated to on-going large-programs, in 2023A the following time is available for Large Programs:
- TNG: 10 nights per semester (up to 4 semesters).
- WHT: this telescope is not offered in 2023A.
- INT: no large programs are accepted in 2023A.
- NOT: 5 nights in 2023A; 10 nights per semester in 2023B, 2024A, 2024B.
- Mercator: 7 nights in 2023A, 17 nights per semester in the following 3 semesters.
- Liverpool: 90 h per semester (up to 4 semesters).
- Stella-SES: 120 h per semester (up to 4 semesters).
- Stella-WiFSIP: 30 h in 2023A, 80 h per semester in the following 3 semesters.
- GTC: no large programs are accepted in 2023A.
All large programs will be evaluated by the CAT and advised by external expert referees, based on the above criteria. Yearly progress reports are expected, and a final report to the CAT is due at the end of the project. Raw data from long-term programs will follow the same proprietary period as regular proposals. Up to 66% of the time distributed by the CAT on the Liverpool (LT), Mercator, STELLA, and INT, up to 33% of the time on NOT and TNG, and up to 15% of the time on the WHT may be assigned to large programs.
To send proposals, ALL applicants must use the night time CAT application tool at http://cat.iac.es. A simple manual to learn how to deal with this application is available in this pdf document. Please, select properly the Committee to which you will submit your proposal: Spanish CAT, Spanish/UF, TAC China, TAC Florida, or TAC Mexico. To submit a proposal, the PI and co-Is need to be registered. If you are already registered but you do not remember your password, please do NOT register twice (in order to avoid confusions for statistical purposes). You can find instructions about how to reset your password in the same webpage or contact the CAT for additional help.
ALL proposals must be written in English.
Applicants must ensure that their proposals comply with the required page limits and layout indicated below. If your proposal is a ToO and/or Large Program proposal, this must be clearly identified by ticking the corresponding labels on http://cat.iac.es.
THERE IS A NEW FORM to build the scientific case of the CAT proposals. All applicants of standard and large proposals are kindly requested to use this new form, which is available here (a “tar” file will be downloaded; read the README file first). Note also that the time request in the on-line application tool has changed, as one should now specify the time requested for each semester by creating as many “Observations” as needed.
In the evaluation of proposals, the Spanish CAT will take into account the publications derived from previous observations with the CAT telescopes. Therefore, in the BIBCodes menu of the application tool, remember to update the fields Comment and Bibliographic code for all proposals approved in the last two years.
Before the deadline expires, please check that the uploaded pdf file (created with the new form) contain the latest version of your proposal, and that it prints correctly. No replacement or updating of the proposal content will be made after the deadline, and those proposals which do not correctly print out or lack relevant sections will be automatically withdrawn from the evaluation process. Those proposals where the font size (12pt) has been reduced or the text of the scientific justification exceeds limitations (one page for common/regular proposals and two pages for large programmes) will also be withdrawn. Figures and Tables cited in the scientific justification should fit a maximum of one page (normal proposals) and two pages (large programs). It is advised to follow the instructions described at http://cat.iac.es/faces/ayuda/pdf_latex.jsf
UPDATED on 9 Sep 2022
Contact: catiac at iac.es