Pi of the Sky off-line experiment with GLORIA Ariel Majcher National Centre for Nuclear Research Warsaw, Poland 10th INTEGRAL/BART Workshop, April 2013

IBWS 2013Pi of the Sky off-line experiment with GLORIA A.Majcher 2 Outline ● GLORIA project ● Demonstrator experiments ● Pi of the Sky data ● Luiza framework ● Results ● Conclusions

IBWS 2013Pi of the Sky off-line experiment with GLORIA A.Majcher 3 GLORIA ● FP7 project

IBWS 2013Pi of the Sky off-line experiment with GLORIA A.Majcher 4 GLORIA ● 13 partners, 17 robotic telescopes

IBWS 2013Pi of the Sky off-line experiment with GLORIA A.Majcher 5 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

IBWS 2013Pi of the Sky off-line experiment with GLORIA A.Majcher 6 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

IBWS 2013Pi of the Sky off-line experiment with GLORIA A.Majcher 7 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

IBWS 2013Pi of the Sky off-line experiment with GLORIA A.Majcher 8 On-line demonstrator ● Sun observations with TAD (Tenerife)

IBWS 2013Pi of the Sky off-line experiment with GLORIA A.Majcher 9 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

IBWS 2013Pi of the Sky off-line experiment with GLORIA A.Majcher 10 Pi of the Sky project First 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, ~11 m range 13 m for 20 coadded frames ● Second unit near Huelva, Spain ● 4 CCD cameras installed in 2010, 12 to be installed 2013

IBWS 2013Pi of the Sky off-line experiment with GLORIA A.Majcher 11 Pi of the Sky data ● Off-line demonstrator experiment 400 images selected from the telescope in Chile ● 4 overlapping observation fields considered

IBWS 2013Pi of the Sky off-line experiment with GLORIA A.Majcher 12 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

IBWS 2013Pi of the Sky off-line experiment with GLORIA A.Majcher 13 Luiza framework Data 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)

IBWS 2013Pi of the Sky off-line experiment with GLORIA A.Majcher 14 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

IBWS 2013Pi of the Sky off-line experiment with GLORIA A.Majcher 15 Data structure initialization Control Of Processing Sequence (image loop) Luiza framework Processing concept (example) Luiza Processor manager Steering file (user input) Darks Flats Raw images Corrected images Gloria Data Container Dark frame reader Flat frame reader Raw image reader Frame normalizer Object finder Astrometry Image storage Telescope parameters

IBWS 2013Pi of the Sky off-line experiment with GLORIA A.Majcher 16 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

IBWS 2013Pi of the Sky off-line experiment with GLORIA A.Majcher 17 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

IBWS 2013Pi of the Sky off-line experiment with GLORIA A.Majcher 18 Results ● Tests on selected constant stars ● Estimated calibration magnitudo distribution ● uncertainty D ● Before (dashed) and after (solid) the quality cut D < 0.1

IBWS 2013Pi of the Sky off-line experiment with GLORIA A.Majcher 19 Results ● Light curves of selected variables ● W Gem, classical cepheid (delta Cep type) V1388 Ori, eclipsing binary of Algol type (detached)

IBWS 2013Pi of the Sky off-line experiment with GLORIA A.Majcher 20 Results ● Light curves of selected variables ● RS Ori, classical Cepheid (delta Cep type) CR Gem, semi-regular variable

IBWS 2013Pi of the Sky off-line experiment with GLORIA A.Majcher 21 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 ● Luiza available – From GLORIA project SVN (go to misc  Tools  Analysis) – From Luiza documentation web page