Rules/Hints for GROND use by other MPI groups
This document describes some rules for the use of GROND by other
groups from Max-Planck Institutes.
- GROND is an imaging instrument which allows simultaneous imaging in
7 bands: Sloan griz in the optical and JHK in the NIR. GROND is permanently
mounted at the MPG/ESO 2.2m telescope on La Silla. Instrument switches
between GROND and WFI/FEROS take of order 1 min. Details of the
instrument are described in a paper published in
PASP 120 (2008) 405-424.
- GROND has been developed and built by MPE Garching and the Thüringer
Landessternwarte Tautenburg. Its main objective is to perform
follow-up observations of gamma-ray bursts. Gamma-ray burst
observations are performed in a nearly-automatic fashion using
Rapid-Response Mode of ESO. GROND-observation triggers happening
fall under ESO-MPIA and MPE-MPIA contracts, and the corresponding time
(15% of the telescope time) is bought by MPE from ESO.
- GROND is not an official ESO instrument ,
and thus not offered during ESO.
- GROND was built for automatic operation, and though it is using
VLT-compliant observing blocks, usage in manual (visitor or service)
mode requires special provisions and knowledge. Non-GROND-team
observers are encouraged to familiarize with GROND operation BEFORE
arriving on La Silla. Help by GROND observers on La Silla may be
available, but is not guaranteed.
- GROND is, in general, offered for use to any staff member of any
In case of questions
don't hessitate to contact Jochen Greiner (firstname.lastname@example.org).
- Astronomers from other MPI groups are welcome to use GROND for their
(with the above caveat). Technically, this has to be done by applying via
standard proposals for 2.2m observing time during MPG periods.
- The GROND team requests to be involved in any science topic which involves
the use of the GROND instrument. The level of involvement will vary on
case by case, and is described below. Jochen Greiner as representative
of the GROND team (email@example.com) should be contacted
prior to submitting
the proposal in order to discuss the involvement, and moreover
agree on the feasibility, details of the execution of the observation
and the delivery of the data.
- MPE and Tautenburg have defined a number of high-priority non-GRB science
topics. If any of those topics is proposed by other MPI astronomers, the
GROND team reserves the right to refuse collaboration if the added value
by that proposal is considered to be not important for the project.
In all other cases, the involvement of the GROND team can range from
pure co-authorship (if the science topic is not covered by GROND interests)
to various levels of collaboration on data acquisition, analysis and/or
interpretation. For large programs which extend over several MPG periods,
it may be useful to involve the GROND team already in the planning process.
- Once a proposal topic has been discussed with the GROND team, and the
of collaboration of the GROND team has been defined, the actual proposal
should be submitted following standard MPIA rules and
- After acceptance of the proposal, the GROND team should be contacted to
agree on the execution of the program. In general, one member of the
GROND team will perform the observations. The OBs should be prepared by
the PI using p2pp, obeying the same deadline as for WFI/FEROS programs.
ESO will assign program-IDs for each accepted program. The GROND instrument
package for p2pp has been delivered to ESO, so should be included in the
official p2pp release. If you prepare your first GROND observation,
hints for preparing the OBs.
- Data are stored on a GROND computer on La Silla. In regular intervals,
data are shipped to Garching (via transportable disks). Since typical
projects do not fill a full night, but extend over several nights, sorting
of the data according to program-ID has to be done. This will be performed
at MPE Garching after data shipment. Data access to the PI will be done
through access at /afs/ipp-garching.mpg.de/mpe/gamma/instruments/grond/data/
(you would need to register at
The whole process typically takes 4-6 weeks,
so again patience is requested.
- The GROND team has established a data reduction pipeline which is
continuously being finetuned. This data reduction includes bias subtraction,
flatfield and distortion correction, shift-and-add of dithered NIR
images, astrometry, and a basic source detection and PSF-photometry.
While this pipeline is presently tuned for GRBs, it is intended to
extend it for generic GROND observations. In the future, these reduced
data may be shipped together with the raw data.
- As mentioned above, any publication using GROND data should contain
representatives of the GROND-team, the number of which will depend
on the level of involvement/collaboration. Also, a reference to the
GROND instrument paper should be made:
Greiner J., Bornemann W., Clemens C., et al. 2008, PASP 120, 405
- According to the agreement with ESO, data should NOT be ftp'ed
from La Silla to Germany - and most likely even cannot be ftp'ed:
per night, you can gather up to 25 Gb data!
Data until 30 Sep 2013
- Data are stored locally on GROND's own RAID array in La Silla, and
are shipped to Garching about once every three weeks.
In Garching, data will be checked for completeness, and then are stored
in the AFS system of the Campus' Computer Center (RZG).
- Make sure that you are registered on our system
(send email to Lars Klose - firstname.lastname@example.org): you can check the
availability of your data
As a rule of thumb, you should be prepared to get your data not earlier
than 4 weeks after the observation.
- The preferred way for you to get access to your data is to install/mount
AFS on a (your) local computer - then you will be able to see the data
directly, and a simple "cp" command will copy the data to your local
computer (if this is what you want).
To find out the full directory path, go to the
start page, click on the corresponding users group you belong to,
and then on the proper observation period.
- Alternatively, if there is no afs machine at your institute, you can
- apply for an account at the Rechenzentrum Garching (ask either
Stefano Zibetti or Bertrand Goldman for help, they have done
this in the past): go to
http://www.rzg.mpg.de/, and follow
the link "New Users" in the left column, or
- use the accounts of one of your collegues
Data after 1 Oct 2013
- Data are automatically copied to the ESO Archive in Garching. Typical delay times
are of order 30-60 min. for individual files, and less than 2 hrs for whole OBs.
- Data shall be accessed via the ESO Web-form - MPE will discontinue providing
data through AFS. The corresponding Web-address is
Note that this data access goes through the ESO User Portal,
i.e. you need to be registered with ESO. Also note that you can only download YOUR data,
i.e. those for which the observation ID matches the PI-name. Calibration frames should
be open for everyone.
- One option to find out the file names (they now obey the ESO convention, rather tha
the GROND-instrument naming scheme) is to go through the standard ESO archive facility:
- 20-Feb-2014: Exception for SKYFLATS:
Since all sky-flatfield exposures are taken with the pre-prepared
OB, and this OB is run under the User-ID of JGREINER, those data
are (and will not be) publicly available in the ESO archive.
Those data can be grabbed from the AFS/RZG-Garching as in the past;
in case of troubles please write to email@example.com
If you want to avoid this, you could import the two skyflat-OBs
into your p2pp session, and save it under your ESO User-ID.
Last modified: Tue Oct 11 09:24:34 MEST 2016