We welcome proposals for observing projects on a number of different telescopes.
APEX
Calls for proposals for single-dish observations with APEX are normally issued once per year, with deadline in February.
Proposals are invited for observations with the APEX telescope in 2024.
Proposals for Swedish time on APEX must have a PI with a Swedish affiliation.
Proposals are to be submitted through the NorthStar system.
Deadline: 23 February 2024 (23:59:59 UTC).
More information (pdf document):
More information
APEX, the Atacama Pathfinder EXperiment, is a 12 m diameter submillimetre telescope at 5100 m altitude on Llano Chajnantor in Chile.
The receivers currently used on Swedish time are the heterodyne receivers SEPIA (SEPIA180: 159-211 GHz; SEPIA345: 272-376 GHz; SEPIA660: 578-738 GHz) and nFLASH (nFLASH230: 200-270 GHz; nFLASH460: 385-500 GHz). In addition, the 7-pixel heterodyne receiver LASMA for 268-375 GHz is available under special conditions. Bolometer arrays are not available.
Onsala 20-m telescope
Calls for proposals for single-dish observations with the Onsala 20 m telescope are normally issued once per year, with deadline in December
Proposals are invited for observations with the Onsala 20 m diameter telescope in the observing period January-December 2024.
Before submitting the proposal, the authors must contact the telescope scientist Henrik Olofsson (henrik.olofsson@chalmers.se) to arrange with a local collaborator to support the observations.
Proposals are to be submitted through the NorthStar system.
Deadline: 8 December 2023 (23:59:59 UTC).
More information (pdf document):
More information
The Onsala 20 m diameter telescope in Sweden is equipped with receivers which provide continuous frequency coverage in the ranges 18-50, 67-87 and 85-116 GHz with 4 GHz IF bandpass, dual polarisations and full mutual sideband rejection (<−13 dB). If the spectrometer bandwidth is reduced to 2.5 GHz then in the two high frequency bands both sidebands can be observed simultaneously ("2SB"), with these sidebands having centres 12 GHz apart. We welcome proposals for Large programmes, that is spanning more than one semester and/or requiring a large number of hours (>~500 h).
Proposals for Directors Discretionary Time (DDT)
Proposals for Directors Discretionary Time (DDT) can be submitted at any time (for observations with APEX, the Onsala 20 m telescope and LOFAR single station observations with the Swedish LOFAR station in Onsala).
In general, a DDT proposal requires a special justification of why the project could not be proposed for a regular deadline. A DDT proposal should follow the same format as regular proposals, for example, the scientific justification should be no more than two A4 pages long, plus figures and tables if needed (for a total of maximum six pages); if only a few hours of observing time are requested, the justification can be shorter. For information about telescopes, instruments, proposal preparation, etcetera, see links in the left column of this page.
All DDT proposals are to be submitted through the NorthStar system. When you have submitted the DDT proposal, please download it in pdf form from NorthStar, and send the pdf file to john.conway@chalmers.se, magnus.thomasson@chalmers.se and michael.olberg@chalmers.se.
Other telescopes
Calls for proposals for observations with some other related instruments can be found here: