From: Daniel D. Kelson Date: Mon, Mar 9, 2026 at 1:22 PM Subject: Follow-up Re: Magellan Instrumentation, with the language from our Call for Proposals Dear Partners, Ian Thompson and I have managed, we think, to get all the information from the instrument teams and PIs gathered for the Carnegie Call for Proposals for 2026b for the Magellan instrumentation. I thought it prudent to pass along what text we include in our Call to our observers so that we could all be on the same page, and also so that everybody has a chance to include the language that the instrument PIs have asked for. Hopefully that will minimize confusion or misunderstandings and also help make it easier for observers to know who to reach out to for collaborating or working with the people responsible for PI instruments, as opposed to facility instruments. More importantly, we hope it makes it easier for people proposing to use instruments to have more up to date web links to the places where instrument PIs maintain information about status and/or repairs when applicable (see, e.g., LLAMAS). Note that this text is copied directly from the markdown file of our call (hence the format). Best regards, Dan Kelson Carnegie Science ----- Instrumentation --------------- A description of the instrumentation available for use on the Baade and Clay telescopes can be found at . Note that there is an Exposure Time Calculator for the optical slit spectrographs on Magellan (LDSS, MIKE, IMACS, and MagE). The ETC can be found at . + Baade: IMACS, FIRE, FourStar, and MagE. + Baade Rosie-IFU: ROSIE-IFU is an image-slicing IFU module for the IMACS spectrograph. Using the IMACS f/2 camera, the unit provides 42 (0.6 x 52 arcsec) slices covering a 26 x 52 arcsec field of view. The unit has not been tried yet at f/4, but with the f/4 camera the IFU should provide higher wavelength resolution (up to R~12000 at the Calcium infrared triplet) using 30 slices with gaps that can be filled by taking data at two positions. With either camera the wavelength coverage must be limited to a dispersed length equivalent to 6 arcmin using a 50 mm filter placed in front of the IFU. Additional information regarding ROSIE-IFU, including a more detailed description, some examples of data produced by the first parts of the data reduction pipeline, and the first pages of the observing manual, are available on the ROSIE-IFU website . ROSIE-IFU will be offered for use on a shared-risk basis in 2026B, in collaboration with instrument PI Steve Shectman. Interested observers should contact him (shec@carnegiescience.edu) for further details before submitting a proposal. + Baade LLAMAS: LLAMAS is a fiber-fed IFU spectrograph on the Baade telescope. Interested observers should contact the instrument PI (Rob Simcoe, simcoe@space.mit.edu) for details. Additional information can be found at with updates about its current status at , describing blue channels to be repaired. These repairs are expected to be complete by the 2026B semester. Google Document of the manual, with what is intended to be the most up-to-date material on LLAMAS, can be found here . + Clay f/11: LDSS3. The LDSS3 spectrograph will be available from July 7 through October 17, and again from November 19 through December 14 in the 2026B semester. + Clay f/11: MIKE. MIKE will be available throughout the 2026B semester. + Clay f/11 PFS: PFS is a high resolution echelle spectrograph optimized for precision radial velocity measurements. PFS is a PI instrument and will only be available via collaborative arrangement with the instrument team. Please read the Collaboration Agreement at . If you are interested in applying for time on PFS in the 2026B semester contact Steve Shectman (shec@carnegiescience.edu) two weeks before submitting a proposal. + Clay f/11 M2FS: M2FS is a multi-fiber spectrograph with both high (17000 < R < 34000), medium (4000 < R < 14000), and low (1500 < R < 3000) resolution modes. M2FS can deploy up to 256 fibers over a field diameter of at the Clay NAS-E f/11 focus. M2FS is a PI instrument and is available via collaborative arrangement with the instrument team. The instrument cannot be used as a purely remotely-operated instrument, but service observing modes can usually be arranged. If you are interested in using M2FS, please contact Mario Mateo (mmateo@umich.edu) for further details before submitting a proposal. + Clay f/11 IFU-M: IFUM is an IFU interface to the M2FS spectrograph. IFUM offers three IFUs ranging in field area/spaxel size from 13x14 arcsec / 0.54 arcsec (HR), 22x24 arcsec / 1.1 arcsec (STD), and 34x35 arcsec / 1.9 arcsec (LSB). Spectral resolution options available with M2FS (see above) are generally also available with IFUM. IFUM will be available for general observing in the 2026B semester as part of the process of transitioning IFUM to facility-instrument status at Magellan. Contact Mario Mateo (mmateo@umich.edu) for further details before submitting a proposal. + Clay f/5: MegaCam. MegaCam is officially retired. + Clay AO: MagAO-X will be offered in the 2026B semester, during a single run, most likely occuring during the November bright run. Proposals are invited for observations in collaboration with the MagAO-X team. Please refer to the Instrument Use Policy here: . Contact the MagAO-X PI, Jared Males (jrmales@.arizona.edu), before submitting to discuss your proposal. + Clay f/11 WINERED: Winered is a Y- J-band echelle spectrograph with intermediate and high resolution modes. There will be two runs in the 2026B semester, with the first run going from mid-October through mid-November, and the second run going from mid-December to the end of the semester on January 16. Information about the instrument can be found at For additional information about instrument performance, characteristics, and availability please contact Andy McWilliam (andy@carnegiescience.edu). + Clay PISCO: PISCO will not be available during the 2026B semester. + Clay Lightspeed: Lightspeed is a high speed, low-noise optical imager mounted at the Clay Nasmyth east focus. There may be opportunity to collaborate with the Lightspeed team on projects in the 2026B semester. Please contact the instrument PI, Kevin Burdge (kburdge@mit.edu), for further details.