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Max-Planck-Institue for Extraterrestrial Physics (MPE)

Research Field

A description of the fascinating research topics follows soon.


Giessenbachstrasse 1
85748 Garching b. München

Members of the Research Group


Other Staff


Course with Participations of Group Members

Offers for Theses in the Group

Alert scheme for gamma-ray transients

The recent detection of gravitational waves (GW) with the advanced LIGO/Virgo instruments in conjunction with a short gamma-ray burst (GRB) has surprised gamma-ray astronomers because of the substantially different properties of the GRB  signal as compared to canonical GRBs. This motivates an "open-mind" search for untriggered transient events in the data stream of the gamma-ray burst monitor (GBM) on the Fermi satellite. With two previous Bachelor theses we have developed a physical background model, paving the way for automated searches, and subsequent source and background fitting.
This thesis shall be devoted to establishing a Python program for identifying long-term (> few minutes up to a year) transients in Fermi/GBM data, localizing them on the sky, and deriving basic properties (spectrum, light curve). One pot\ential application is to determine the spectral properties of the predicted seasonal variation of the background due to axions. The project includes elements from computational and observational high-energy astrophysics, and will allow for obtaining extensive knowledge on the broad class of high-energy transients. 
Some background in astrophysics is advantegeous, but affinity with Python programming is a must. 
Contact: Jochen Greiner,, MPE Room 1.3.13, Tel. 30000-3847

suitable as
  • Master’s Thesis Nuclear, Particle, and Astrophysics
Supervisor: Jochen Greiner
Interferometric imaging with GRAVITY

GRAVITY [1] is a novel instrument which combines the light of four telescope at the ESO VLTI observatory. Employing the techniques of fringe tracking and phase referencing, it allows to measure complex visibilities at IR wavelengths and for imaging at unprecedented angular resolution in this part of the electromagnetic spectrum. Our group's particular interest is the use of GRAVITY for high-precision studies of the galactic center, where it has enabled several breakthrough discoveries [2]. To cope with the data complexity, we are developing a novel imaging code, based on the framework of Information Field Theory [3], which is written in python and based on the NIFTy [4] package. The goal of this master project is to investigate instrumental systematics, their impact on image reconstruction and to implement a model or correction. Eventually, a better description of the instrument will push the sensitivity towards fainter objects and allow to study Sagittarius A*, the radio source associated with the massive black hole in the center of the Milky Way, in greater detail.

Contact: Dr. Julia Stadler <>

[1] GRAVITY collaboration, "First light for GRAVITY: Phase referencing optical interferometry for the Very Large Telescope Interferometer", Astronomy & Astrophysics, Volume 602, id.A94, 23 pp.

[2] GRAVITY collaboration, "GRAVITY and the Galactic Center", ESO Messenger Vol. 178, 2019

[3] T. Enßlin, "Information Theory: Information Theory for Fields", Annalen der Physik, vol. 531, issue 3, p. 1970017

[4] P. Arras et al., " NIFTy5: Numerical Information Field Theory v5", Astrophysics Source Code Library, record ascl:1903.008

suitable as
  • Master’s Thesis Nuclear, Particle, and Astrophysics
  • Master’s Thesis Applied and Engineering Physics
Supervisor: Frank Eisenhauer
Testing an Anger camera for gamma-ray spectroscopy

The improvements of Silicon photo-multipliers (SiPM) over the last years qualify them as promising replacements for classical photo-multiplier tubes (PMT). This is particularly interesting for cases where the high voltages and large dimensions of PMTs are difficult to afford, such as for space applications. For the simplest version of gamma-ray detectors, a scintillator crystal read out by SiPMs, the size of the scintillator determines the sensitivity, and thus should stay large. This suggests an Anger camera principle as the most efficient way for a gamma-ray detector in space: a mosaic of sparsely distributed single-cell SiPMs instead of the coverage of the full scintillator area.

This Master thesis shall test and optimize a 5x5 cm^2 sized CeBr3 scintillator read out with a mosaic of SiPMs. Measurements of the spatial and spectral resolution as well as efficiency (noise) and power consumption are foreseen, and form the basic parameters for the trade-off study. The set-up has two potential applications: (i) in the ComPol Cubesat mission pursued within the Origins Cluster of Excellence, and (ii) the POLAR-2 gamma-ray burst polarisation mission developed within the SFB "Neutrinos and Dark Matter".

Interest in electronics and ASIC readout is required, and some background in astrophysics is advantegeous. The lab-work will be done at MPP Freimann, shared with Prof. S. Mertens group.
Contact: Jochen Greiner,, MPE Room 1.3.13, Tel. 30000-3847

suitable as
  • Bachelor’s Thesis Physics
  • Master’s Thesis Nuclear, Particle, and Astrophysics
Supervisor: Jochen Greiner
Improving the localization of GRBs

Gamma-ray bursts (GRBs) are flashes of gamma-rays resulting from the death of massive stars or the merger of neutron stars. The latter also produce gravitational waves. The presently most prolific GRB detector is the "Gamma-Ray Burst Monitor" (GBM) on the Fermi satellite, containing 12 NaI scintillation detectors. The position is derived by comparing the relative count rates in the differently oriented scintillator planes.

This thesis shall use existing flight data of the brightest gamma-ray source on the sky (the Crab nebula) and improve the spatial resolution of the response matrix of selected detectors. The result shall be tested by localizing selected GRBs with GBM, and comparison against known positions of these GRBs from other satellites (e.g. Swift).

Technically, this thesis involves learning of (i) learning the basics of GRBs, (ii) data analysis of non-imaging gamma-ray detectors, (iii) understanding and correcting detector effects, (iv) fitting light curves with different count statistics, and (v) analyzing and combining large amounts of individual constraints into a coherent picture.

Some background in astrophysics is advantegeous. Python knowledge is required, and good programming skills. Joy in data analysis is required.

    Contact: Jochen Greiner,, MPE Room 1.3.13, Tel. 30000-3847

suitable as
  • Bachelor’s Thesis Physics
Supervisor: Jochen Greiner

Current and Finished Theses in the Group

GRAVITY Wide - Dual-Beam Optical/Infrared Interferometry
Abschlussarbeit im Masterstudiengang Physik (Kern-, Teilchen- und Astrophysik)
Themensteller(in): Frank Eisenhauer
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