Description
The Compton Spectrometer and Imager, COSI, is a Compton telescope operating in the 0.2-5 MeV energy range and capable of imaging, spectroscopy and polarimetry of astrophysical sources. Such capabilities are made possible by COSI's twelve germanium cross-strip detectors, which provide for high efficiency, high resolution spectroscopy, and precise 3D positioning of photon interactions. This directory gathers the heliophysics data observed during the 2016 COSI balloon flight. In May 2016, COSI took flight from Wanaka, New Zealand, on a NASA super-pressure balloon. For 46 days, COSI floated at a nominal altitude of 33.5 km, continually telemetering science data in real-time. The payload made a safe landingin Peru, and the hard drives containing the full raw data set were recovered.
The following files are included in this directory:
megalib_v3.02.zip:
All the software (MEGAlib) to analyze this data
massmodel.tar.gz:
The COSI-2016 mass model to analyze this data
COSI2016_GeD_L3EventList_DREP_20160521_v04.fits.gz:
A level 3 event list from May 21th 2016 containing a multi-peak DREP event.
COSI2016_GeD_L3EventList_DREP_20160530_v04.fits.gz
A level 3 event list from May 30th 2016 containing 2 DREP complexes and a micro-burst event.
The latest version of the data analysis software can be found here:
https://github.com/zoglauer/megalib.git
Documentation on how to use the software can be found in the "doc" directory of MEGAlib, especially in the file Mimrec.pdf. Before usage with MEGAlib, the data needs to be converted into MEGAlib's tra file format, for example:
TraFitsConverter -f COSI2016_GeD_L3EventList_DREP_20160530_v04.fits.gz -g COSI.DetectorHead.geo.setup
The mass model files "COSI.DetectorHead.geo.setup" can be found in the massmodel.zip file.
Notes
Meaning of the columns in the fits files:
ID: ID of the event,
TYPE: Type: 1: single, 2: Compton, 3: Pair,
TIME: Time the event was measured - seconds since epoch (float),
TIME_S: Time the event was measured - seconds (int),
TIME_NS: Time the event was measured - nano-seconds (int),
GX_LAT: Pointing of telescope X axis in Galactic coordinates,
GX_LONG: Pointing of telescope X axis in Galactic coordinates,
GZ_LAT: Pointing of telescope Z axis in Galactic coordinates,
GZ_LONG: Pointing of telescope Z axis in Galactic coordinates,
HX_AZI: Pointing of telescope X axis in Horizontal coordinates,
HX_ELE: Pointing of telescope X axis in Horizontal coordinates,
HZ_AZI: Pointing of telescope Z axis in Horizontal coordinates,
HZ_ELE: Pointing of telescope Z axis in Horizontal coordinates,
NIA: Number of interactions,
ENERGY1: Energy deposited in interaction 1,
POSX1: X position of interaction 1,
POSY1: Y position of interaction 1,
POSZ1: Z position of interaction 1,
DENERGY1: Uncertainty of energy deposited in interaction 1,
DPOSX1: Uncertainty of X position of interaction 1,
DPOSY1: Uncertainty of Y position of interaction 1,
DPOSZ1: Uncertainty of Z position of interaction 1,
ENERGY2: Energy deposited in interaction 2,
POSX2: X position of interaction 2,
POSY2: Y position of interaction 2,
POSZ2: Z position of interaction 2,
DENERGY2: Uncertainty of energy deposited in interaction 2,
DPOSX2: Uncertainty of X position of interaction 2,
DPOSY2: Uncertainty of Y position of interaction 2,
DPOSZ2: Uncertainty of Z position of interaction 2,
ENERGY3: Energy deposited in interaction 3,
POSX3: X position of interaction 3,
POSY3: Y position of interaction 3,
POSZ3: Z position of interaction 3,
DENERGY3: Uncertainty of energy deposited in interaction 3,
DPOSX3: Uncertainty of X position of interaction 3,
DPOSY3: Uncertainty of Y position of interaction 3,
DPOSZ3: Uncertainty of Z position of interaction 3,
ENERGY4: Energy deposited in interaction 4,
POSX4: X position of interaction 4,
POSY4: Y position of interaction 4,
POSZ4: Z position of interaction 4,
DENERGY4: Uncertainty of energy deposited in interaction 4,
DPOSX4: Uncertainty of X position of interaction 4,
DPOSY4: Uncertainty of Y position of interaction 4,
DPOSZ4: Uncertainty of Z position of interaction 4,
ENERGY5: Energy deposited in interaction 5,
POSX5: X position of interaction 5,
POSY5: Y position of interaction 5,
POSZ5: Z position of interaction 5,
DENERGY5: Uncertainty of energy deposited in interaction 5,
DPOSX5: Uncertainty of X position of interaction 5,
DPOSY5: Uncertainty of Y position of interaction 5,
DPOSZ5: Uncertainty of Z position of interaction 5,
ENERGY6: Energy deposited in interaction 6,
POSX6: X position of interaction 6,
POSY6: Y position of interaction 6,
POSZ6: Z position of interaction 6,
DENERGY6: Uncertainty of energy deposited in interaction 6,
DPOSX6: Uncertainty of X position of interaction 6,
DPOSY6: Uncertainty of Y position of interaction 6,
DPOSZ6: Uncertainty of Z position of interaction 6,
ENERGY7: Energy deposited in interaction 7,
POSX7: X position of interaction 7,
POSY7: Y position of interaction 7,
POSZ7: Z position of interaction 7,
DENERGY7: Uncertainty of energy deposited in interaction 7,
DPOSX7: Uncertainty of X position of interaction 7,
DPOSY7: Uncertainty of Y position of interaction 7,
DPOSZ7: Uncertainty of Z position of interaction 7,
QUAL1: Primary quality factor of this event,
QUAL2: Secondary quality factor of this event,
