MAGIC observation proposals


MAGIC observation proposals (Cycle 16)


MAGIC OBSERVATIONS PROPOSED BY EXTERNAL SCIENTISTS

The MAGIC collaboration encourages individual external scientists to propose observations to be performed with the MAGIC telescopes. Observation time will be granted by the Time Allocation Committee based on scientific merit.

The observation cycle 16 spans from 2021 January 25th to 2022 January 23rd. The deadline to submit the MAGIC proposals is October 23rd at 23:00 CET.

MAGIC is not an open observatory, and the analysis of the data requires specific expertise and tools. Some members from the MAGIC team will be supporting the external projects throughout the entire procedure of proposal submission, and (if the observation time is granted) data reduction and publication.
The details on the authorship of the publications will be discussed and agreed before the submission of the observation proposal. The MAGIC collaboration shall be included in the authors' list of the publications reporting these data results for the first time.

GUIDE FOR PROPOSALS

The amount of observations performed yearly with the MAGIC telescopes are about 1000 hours, depending on weather conditions and technical access during that year. Additionally, moon observations can add up to 400 hours.

The amount of time requested in single MAGIC proposals (for a 1-year cycle) spans from 10-20 hours to 100-150 hours (typically < 50h). Requests for multiyear observations can also be done; they will be re-evaluated after each year.

The deadline for proposal submission is October 23rd at 23:00 CET. In any case, we encourage external scientists to contact the MAGIC physics coordinator (antonio.stamerra@inaf.it), preferably before October 2nd. The physics coordinator will check if the proposed observations have already been performed, or are planned as part of a running project within the MAGIC collaboration. To enhance the feasibility of the proposal, the topic and the specifics of the observations should be examined and discussed with scientists from the MAGIC collaboration well before the proposal submission deadline.

Through a XMM-MAGIC joint programme, the MAGIC Time Allocation Committee from Cycle-16 may award up to 42 hours (150 ks) of XMM time.

The submission of the proposals for MAGIC observations is performed through the MAGIC Proposal Submission System.



PERFORMANCE OF THE MAGIC TELESCOPES

The performance of the MAGIC telescopes during regular dark-time observations is reported in full detail in Aleksic et al 2016, while the performance of MAGIC during moon-light is reported in Ahnen et al 2017. The main performance plots are reported in this page, and a few key numbers are given below:

  • Sensitivity for point-like sources (<0.1 deg) : 0.8% the flux of the Crab nebula above 0.2 TeV in 50 hours of observation (using Sigma Li&Ma 1983, and 3 background regions), which is about 5% the flux of the Crab nebula in 1 hour. The numbers from the differential sensitivity plot can be retrieved from this page.
  • Sensitivity for extended sources (>0.1 deg) : the sensitivity of MAGIC reduces with the source extension approximately as sqrt((0.1deg)^2 + (Source_Radius)^2), and the analysis becomes difficult (yet not impossible) for extensions larger than 0.6 degrees radius.
  • Analysis energy threshold: ~75 GeV x pow(cos(Zenith_Angle),-2.3) for a Crab-like spectrum. We note that, for strong and/or steep sources, it is possible to measure gamma rays below such threshold, as shown in Ahnen et al 2015a and Ahnen et al 2015b, where spectra starting at 40-50 GeV are reported.
  • Energy resolution: about 20% per incoming gamma ray.
  • Angular resolution: better than 0.1 deg per incoming gamma ray.

MAGIC PROPOSAL TOOLS

The visibility of the source from the MAGIC site can be evaluated with this custom-made source visibility tool. Other publicly available visibility tools can be found at the TeV Catalog and Isaac Newton group of telescopes.
A macro to evaluate the ability of the MAGIC telescopes to detect a gamma-ray source is available. The macro takes a given spectral shape and, using the published MAGIC performance described above, estimates what kind of signal can be expected after a given amount of observation time. The spectral shape and the amount of time for the observation is set inside the macro (see basic settings inside the macro). Two versions are available: ROOT-based and Python-based. For detailed description and usage see the header of the files.
ROOT version: mss.cpp
EBL model file: ebl_tau.txt
Python version: mss.py
In case you would like to use the results of this macro in a scientific publication, we would like to ask to cite Aleksic, J., et al., 2016, Astroparticle Physics, 72, 76 , which is the publication reporting the performance of the MAGIC telescopes.