Pi of the Sky off-line experiment with GLORIA. Ariel Majcher National Centre for Nuclear Research Warsaw, Poland

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

2 Outline GLORIA project Demonstrator experiments Pi of the Sky data Luiza framework Results Conclusions 2

3 GLORIA FP7 project 3

4 GLORIA 13 partners, 17 robotic telescopes 4

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 5

6 GLORIA structure control RT control interface On-line experimen t interface Off-line experiment interface data GLORIA user database Robotic Telescope Controler RT and its infrastructure Observation Time Scheduler RT data storage Data Access and Analysis Server GLORIA observation database CPUs GLORIA data storage 6

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 7

8 On-line demonstrator Sun observations with TAD (Tenerife) 8

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

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 9

Pi of the Sky project First unit installed in LCO Chile, moved to San Pedro de Atacama in 2011 2 CCD cameras 2000 2000 Canon f=85mm, d=f /1.

10 Pi of the Sky project First unit installed in LCO Chile, moved to San Pedro de Atacama in CCD cameras Canon f=85mm, d=f /1.2 lenses Common FoV s exposures, ~11m range 13m for 20 coadded frames Second unit near Huelva, Spain 4 CCD cameras installed in 2010, 12 to be installed

11 Pi of the Sky data Off-line demonstrator experiment 400 images selected from the telescope in Chile 4 overlapping observation fields considered 11

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 12

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 Each and tables stored in collections collection has a unique name (string) 13

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 14

15 Luiza framework Processing concept (example) Luiza Steering file (user input) Data structure initialization Processor manager Telescope parameters Control Of Processing Sequence (image loop) Gloria Data Container Dark frame reader Darks Flat frame reader Flats Raw image reader Raw images Frame normalizer Object finder Astrometry Image storage Corrected images 15

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 16

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 object's specified by user brightness normalized to catalogue stars normalization resulting uncertainty calculated frame by frame light curve displayed in web interface 17

18 Results Tests on selected constant stars Estimated calibration uncertainty magintudo distribution Before (dashed) and after (solid) the quality cut 18

19 Results Light curves of selected variables W Gem, classical cepheid (delta Cep type) V1388 Ori, eclipsing binary of Algol type (detached) 19

20 Results Light curves of selected variables RS Ori, classical Cepheid (delta Cep type) CR Gem, semi-regular variable 20

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 21

Introduction to CCDs and CCD Data Calibration

Introduction to CCDs and CCD Data Calibration Dr. William Welsh San Diego State University CCD: charge coupled devices integrated circuit silicon chips that can record optical (and X-ray) light pixel =