Possible associated signal with GW150914 in the LIGO data

Understand

We present a simple method for the identification of weak signals associated with gravitational wave events.

• Its application reveals a signal with the same time lag as the GW150914 event in the released LIGO strain data with a significance around $3.2\sigma$.
• This signal starts about 10 minutes before GW150914 and lasts for about 45 minutes.
• Subsequent tests suggest that this signal is likely to be due to external sources.