skip to main content

LIGO Seminar

Tuesday, September 6, 2016
1:00pm to 2:00pm
Add to Cal
West Bridge 351 (LIGO Science Conference Room)
Electromagnetic Follow-up Pipeline Using Shapelet Analysis for Automatic Transient Detection
Kendall Ackley, Physics, University of Florida,

With two confirmed observations of gravitational wave (GW) events, the
era of GW astronomy has begun, however, a coincident observation of an
electromagnetic (EM) counterpart has yet to be produced. In order to
reliably identify and link potential EM counterparts, a major
challenge to overcome is to find effective selection criteria to
reduce the number of false-positives in telescope images. Specifically
in the case of wide-field telescopes, differential image analysis
suffers from imperfect image subtraction, in part due to variations of
the point-spread function across the image.

I will discuss a pipeline that was developed to address this issue.
Using a dedicated metric in a shapelet space, the point-likeness of
image residuals can be characterized and artifacts rejected with good
certainty. The pipeline has been used on a set of both PTF and DECam
images with representative sky coverage, removing on average up to
99.95% of all image subtraction artifacts.

Surveying the sky for transients using the pipeline on archival
images, I extracted a realistic rate of false-positives to be expected
from LIGO-Virgo probability skymaps.


We plan to broadcast these talks using TeamSpeak. Use a sub-channel of

LIGO Lab called "LIGO Seminar", which is not password protected.

NOTE: These and all other scheduled LIGO seminars are listed on the LIGO

Laboratory seminar calendar 

OR on LIGO Website: Click on LIGO CIT, under Calendars, see LIGO Seminar

For more information, please contact Sydney Meshkov by email at [email protected].