the gloria demonstrator experimentgloria-project.eu/.../2014/05/wilga_2013_a_majcher.pdfwilga 2013...

The GLORIA demonstrator experimentThe GLORIA demonstrator experiment

Ariel MajcherAriel MajcherNational Centre for Nuclear ResearchNational Centre for Nuclear Research

Warsaw, PolandWarsaw, Poland

XXXII IEEE-SPIE Joint Symposium Wilga 2013, May 29 2013XXXII IEEE-SPIE Joint Symposium Wilga 2013, May 29 2013

Wilga 2013 The GLORIA demonstrator experiment A. Majcher 2

Outline

● GLORIA project● Demonstrator experiments● Pi of the Sky data ● Luiza framework● Results● Conclusions


GLORIA● FP7 project

http://gloria-project.eu/


GLORIA● 13 partners, 17 robotic telescopes


GLORIA● Project goals:

– Create free and open-access network of robotic telescopes for citizen science

– Develop Web 2.0 environment for easy access to telescopes and other network resources

– Design tools for doing „on-line” experiments (observations) and „off-line” experiments (data analysis) new quality: observations possible 24/24

– Develop full framework for doing research with robotic telescopes, allowing also for easy integration with GLORIA network

– Outreach in science and astronomy


GLORIA structure

RT control interface

On-line experiment

interface

Off-line experiment

interface

Robotic Telescope Controler

Observation Time

Scheduler

Data Access and Analysis

Server

RT data storage

GLORIA data

storage

GLORIA user

database

CPUs

RT and its infrastructure

GLORIA observation database

control

data


GLORIA experiments● GLORIA should allow users to perform various

on-line and off-line experiments in the network● To present network capabilities and

performance of the developed tools demonstrator experiments are created:

– On-line demonstrators for telescope teleoperation and scheduled sky observations

– Off-line demonstrators for simple (education level) and more advanced (research) image analysis

http://users.gloria-project.eu/


On-line demonstrator● Sun observations with TAD (Tenerife)

http://users.gloria-project.eu/


Pi of the Sky project● Leading Polish research units:

– National Centre for Nuclear Research– Center for Theoretical Physics, PAS– Faculty of Physics, University of Warsaw

in cooperation with other institutes● Search for optical signal of GRBs

– wide field sky monitoring with high temporal resolution and automatic detection

● Study other variable objects – supernovae, novae, flare stars,variable stars


Pi of the Sky projectFirst unit installed in LCO Chile,

moved to San Pedro de Atacama in 2011● 2 CCD cameras 2000×2000 pixels● Canon f = 85mm, d = f/1.2 lenses● Common FoV 20°×20° ● 10 s exposures, ~11m range

13m for 20 coadded frames

Second unit near Huelva, Spain● 4 CCD cameras installed in 2010, 12 to be installed 2013


Pi of the Sky data● Off-line demonstrator experiment

400 images selected from the telescope in Chile

4 overlapping observation fields considered


Luiza framework● Analysis tool based on the following approach:

– Data (image) analysis should be divided into small, well defined steps (implemented as so called processors)

– Each step has to have well defined input and output data structure

– By defining universal data structures we make sure that different processors can be connected in a single analysis chain, i.e. exchange data and analysis results

– Processor configuration and their parameters can be set by user at run time in a simple steering file


Luiza frameworkData structures● GloriaFitsImage - class for storing FITS images

– uses fitsio library for reading and storing images– basic methods for image manipulation

● GloriaFitsTable - class for storing other data– flexible (integers, floats, strings, vectors of int/float)

● GloriaDataContainer – internal storage class– Images and tables stored in “collections”– Each collection has a unique name (string)


Luiza framework● Steering file

– Allows user to create analysis chain by selecting processors and defining their order

– Allows to define input-output streams and set other processor parameters

● Each Luiza processor gets a pointer to global GloriaDataContainer

– Can create new collection when reading data from file– Can analyse data stored in memory– Can save analysis results to output files


Data structure

initialization

ControlOf

ProcessingSequence

(image loop)

Luiza frameworkProcessing concept (example)

Luiza Processor manager

Steering file(user input)

Darks

Flats

Raw images

Corrected images

GloriaData

ContainerDark frame

reader

Flat frame reader

Raw image reader

Frame normalizer

Object finder

Astrometry

Image storage

Telescopeparameters


Luiza framework● General tools

– Input and output of FITS image files (using fitsio)– Input and output of data tables to FITS or text files– Image viewer based on CERN root package

● Image processing tools– Simple geometry operations– Image stacking or averaging– Image normalization dark/bias subtraction and flat correction– Star position & brightness determination– Implementation of astrometry.net– Light curve reconstruction


Off-line demonstrator● Preprocessing of Pi of the Sky data

– Image stacking, dark subtraction, flat correction– object finding and astrometry– object lists stored to binary FITS tables

● Final analysis - light curve reconstruction– coordinates specified by user– object's brightness normalized to catalogue stars– normalization uncertainty calculated frame by frame– resulting light curve displayed in web interface


Results● Tests on selected constant stars

Estimated calibration magnitudo distribution uncertainty ∆

Before (dashed) and after (solid) the quality cut ∆ < 0.1


Results● Light curves of selected variables

W Gem, classical cepheid (delta Cep type) V1388 Ori, eclipsing binary of Algol type (detached)


Results● Light curves of selected variables

RS Ori, classical Cepheid (delta Cep type) CR Gem, semi-regular variable


Conclusions● GLORIA network opened for users● Efficient and flexible analysis framework developed ● Pi of the Sky data used for off-line demonstrator● Demonstrator implemented, should be released soon

visit http://users.gloria-project.eu/● Luiza available

– From GLORIA project SVN http://sourceforge.net/projects/gloriaproject/(go to misc → Tools → Analysis)

– From Luiza documentation web page http://hep.fuw.edu.pl/u/zarnecki/gloria/luiza/doc/html/index.html

the gloria demonstrator experimentgloria-project.eu/.../2014/05/wilga_2013_a_majcher.pdfwilga 2013...

Documents