PI OF THE SKY AND GRAVITATIONAL WAVES SEARCHES Adam Zadrożny

Core Information  Gravitational waves are still undetected  Some of detectable gravitational wave sources have E-M counter part  If an event in gravitational wave detector has an E- M counterpart, than it might be a good clue sugesting that it might be gravitational wave event

Agenda  Gravitational waves and where do they come from  Looc-Up project  Optical Transient Ext-Trig Search  Future  Summary

Gravitational Waves and where do they come from …

Gravitational Waves

Binary Coalescence and Supernova Explosions  NS-NS / NS-BH binaries  Supernovae

Detection of gravitational waves

Looc-Up Project

Locating and Observing Optical Counterparts to Unmodeled Pulses  Search for an optical counterpart to a gravitational waves event  to confirm an event  to gather more information

Looc-Up Project Science Runs  Winter Science Run  TAROT, QUEST, Swift  Autumn Science Run 2010  TAROT, QUEST, Switf, Skymapper, Pi of the Sky, ROTSE, PTF, ZADKO, Liverpool, LOFAR

LUMIN  A system for locating a position of an event on the sky (accuracy of positioning ~5 o )  Figuring out scopes for observations  Helping human to make a decisions about observations  LUMIN sends up to one alert per day

LUMIN

Telescopes Involved in Looc-Up Project  Quest (Chile, FOV 4.6 o x 4.1 o )  Tarot  North (France, FOV 1.86 o x 1.86 o )  South (Chile, FOV 1.86 o x 1.86 o )  Pi of the Sky (Poland, FOV 20 o x 20 o )  Zadko (Australia, FOV 0.23 o x 0.23 o )  … and other

Telescopes Involved in Looc-Up Project

Models of possible sources  Long GRB  Long GRB off-axis  Short GRB  Short GRB off-axis  Supernovae  Kilonovae  Other … Pi of the Sky limitting magnitude

Sky maps and tilling

Overview of the System  Camera:  FOV: 20 deg x 20 deg  Exposition time: 10 s  Limiting briththess: 12 mag  CCD: 2 K x 2 K  Observation site:  Koczargi Stare near Warsaw, Poland

Pi of the Sky observations  Observation took place during Autumn Science Run  One alert observed – G23004  444 Images taken  More than 2000 deg2 observed on the first night  Limiting magnitude: 10.5 – 11 mag

G23004 – images taken NightImages Sumary444

Pipeline  For analysis we used catalog based pipeline  As a seed for star catalog we used Guide Star Catalog with stars up to 11 mag  For each exposition we add all recognized stars to the databases with their brightness measurements  Normalization of brightness to V magnitudes from TYCHO catalog

Transient Search  Transient search:  Looking for new objects that fulfill quality constrains  Looking a objects that suddenly increases their brightness  All transients are going under human inspection  Objects that are suppected to be transients were cross-corelated with INTA images taken months after the science run

Transient Recognition Efficiency

Lesson Learned  With Pi of the Sky system it is possible to image huge part of the sky within less than an hour  On-line transient recognition might be essential in next run for effective transients onservation an recognition

Optical Transient Ext-Trig search

Optical Transients ExtTrig Search  The main aim of the project is to make externally triggered search connected with optical transients of unknown astronomical origin  Currently we have data only from Pi of the Sky telescope

The Data that We Have  S5  About 40 optical transients were observed from Las Campanas Observatory Chile  S6eVSR4  31 transients were observed from San Pedro di Atacama

Optical Transients  Most of those transients has a duration less than 10 s.  One transient that coincide with S5 has a duration 60 s.  All transients were registered on both cameras

Pi of the Sky - Scopes  4 cameras that might work in coincidence or not  Each camera  FOV: 20 [deg] x 20 [deg]  Limiting brightness: 12 mag  Exposition time: 10 s  2 cameras working in coincidence  Each camera  FOV: 20 [deg] x 20 [deg]  Limiting brightness: 12 mag  Exposition time: 10 s INTA (Spain)San Pedro de Atacama (Chile)

Possible Sources  Off-axis short GRBs Or orphaned after glows from such a grbs  Some unknown astronomical events  For example this event also do not fit to our knowledge  Rarely flashing satellites that are not included in databases

The Search  Software used:  X-pipeline  Bandwidth:  64 Hz – 2000 Hz  On-Source Window  Begin: -600 s  End: 496 s  Off-Source Window  s

Waveforms Used  Inspiral – incljitter (90)  Chirplet – incljitter (0, 90)  White Noise Burst

Post-Processing  Due to unknown origin of the transients we do not know anything about polarisation  We need to do postprocessing twice  Focused on circulary polarised waves  No constrains on polarisation

Summary  To make externally triggered search X-pipeline is used  The source of the transients is unknown  Project is going to be finish this year

Future

Future system  FOV : 1,5 sr  Paralax : > 100 km  Limiting magnitude: 12 mag  Site: Spain  Operational time:

Summary

 Pi of the Sky took a part in two gravitational wave searches projects  Looc-Up  Optical Transient ExtTrig Search  Published results from both projects are expected in late 2012 or early 2013  Pi of the Sky is biggest FOV telescope that taking part in gravitational wave searches

Questions?