Observing Season and applications for observing time

General Info

We have carried out a major redesign of the GREGOR optical setup. 2020A is the commissioning and science verification phase, during which we carry out joint observations with data sharing. The preliminary schedule to start observing in May had to be delayed due to COVID-19. GREGOR was aligned in July and commissioning started on July 30.
- 1 month (Jul 30-Aug 28):  technical commissioning by KIS.
- 1.5 months (Aug 29-Oct 17): science verification jointly by KIS, IAC, AIP.

Special rules concerning co_authorship apply to the joint science verification KIS, IAC, AIP in 2020A:

Publications: All data can be used freely. We expect everybody to follow good scientific practice (=include everybody who contributed significantly). Because of the large effort for the redesign and the implementation, T. Berkefeld and L. Kleint shall be included as Co-authors (unless they wish not to be on the paper) on any paper resulting from data taken during the science verification and commissioning phase. 

 These rules do not apply for the 2021A observing season which will be carried out in "regular" PI mode.




Observing season 2021 A  (6 April to 6 August)


We invite proposals for observing campaigns at GREGOR in 2021, with a submission deadline of January 25, 2021, 23:59 UT. The GREGOR telescope will operate with 2 observing seasons. This call is for the first season (6th April to 6th August 2021), another call may be expected in June.


Depending on the COVID-19 situation the PI will be able to conduct observations at the observatory on Tenerife with support of assistants present there or remotely assisting from Germany, or alternatively the PI can travel to KIS in Freiburg to observe remotely. Experienced PIs may also observe from their home institutions (with the assistant being in Freiburg and connected via Zoom). In other situations, there might be limited service mode operations possible.



See under "Options for telescope access" which channel to apply at for the different access options. Note that the proposal deadline is January 25 2021, 23:59UT.


In case of oversubscription, the proposals will be ranked by external referees based on scientific merit. For the German time, this will be done in double-blind mode (i.e. the referees will not obtain the cover page of the proposal - similarly to Hubble proposals, https://physicstoday.scitation.org/do/10.1063/PT.6.3.20190301a/full/), therefore please avoid mentioning your name in the scientific justification.


Please use the proposal template below to apply for the German observing time. The same template is found at the Spanish Time/SOLARNET/CCI Time pages, where however additional information/forms may need to be filled.

 <GREGOR tex proposal template 2021A>

 <GREGOR pdf preview of template>


Options for telescope access

CCI international time program (ITP):

5% of the telescope time are reserved for international access to all solar telescopes on the Canary Islands (GREGOR, VTT, THEMIS). The observing time is assigned by the EAST TAC. For ITP time, applications must include researchers with affiliations in at least two of the following countries: Spain, UK, Germany, France, Italy, Finland. Contact Dan Kiselman for more information. Application at https://solarnet-project.eu/call-for-proposals-for-solar-telescopes-GREGOR-and-SST-and-THEMIS-period-2021a

Spanish time (solar CAT)

See www.iac.es/OOCC/solar-cat/ for more information. According to international agreements, 20% of the observing time is reserved for assignment by the Spanish solar CAT. Presently, there are no restrictions on nationality to apply for GREGOR and VTT time through the solar CAT. Application at www.iac.es/OOCC/solar-cat/.


A total of approximately 20 days (GREGOR) are available for SOLARNET observers in 2021 A. More days will be announced for 2021B. The observing time is assigned by the EAST TAC. Application at https://solarnet-project.eu/call-for-proposals-for-solar-telescopes-GREGOR-and-SST-and-THEMIS-period-2021a

German time

(split 20%/20%/60% between the AIPMPS, and KIS, leading to effective observing times of 15%/15%/45% of the total available time). Each institute has guaranteed observing time at GREGOR and VTT. KIS decided to open their observing time with no restriction on nationality/institute provided that at least one Co-I on the observing proposal is from KIS. Contact tac@leibniz-kis.de for more information. To apply send filled out proposal template found above to  tac@leibniz-kis.de. 



Required acknowledgement and citations: 

The 1.5-meter GREGOR solar telescope was built by a German consortium under the leadership of the Leibniz-Institute for Solar Physics (KIS) in Freiburg with the Leibniz Institute for Astrophysics Potsdam, the Institute for Astrophysics Göttingen, and the Max Planck Institute for Solar System Research in Göttingen as partners, and with contributions by the Instituto de Astrofísica de Canarias and the Astronomical Institute of the Academy of Sciences of the Czech Republic. The redesign of the GREGOR AO and instrument distribution optics was carried out by KIS whose technical staff is gratefully acknowledged.


GREGOR papers to be cited (when referring to GREGOR):

Schmidt et al. 2012, AN 333/9, 796

Kleint et al. 2020, A&A 641, A27

plus the respective instrument papers.


GREGOR Observing plan 2020 (updated Aug 1, 2020):



GREGOR Observing plan 2019 (updated Oct 3, 2019):



GREGOR Observing plan 2018 (updated Oct 3, 2018):