PI OF THE SKY AND GRAVITATIONAL WAVES SEARCHES Adam Zadrożny.

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

T

c

G8g

4vG

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 2009-2010

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 ~5o)

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 4.6o x 4.1o) Tarot

North (France, FOV 1.86o x 1.86o) South (Chile, FOV 1.86o x 1.86o)

Pi of the Sky (Poland, FOV 20o x 20o) Zadko (Australia, FOV 0.23o x 0.23o) … 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

Night Images

0 23

1 -

2 96

3 81

4 49

8 78

27 117

Sumary 444

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 onboth 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 http://iopscience.iop.org/0004-637X/690/2/1358

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 10800 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

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?