Transient Events in Archival Very Large Array Observations of the Galactic Center
Anirudh Chiti, Shami Chatterjee, Robert Wharton, James Cordes, T., Joseph W. Lazio, David L. Kaplan, Geoffrey C. Bower, Steve Croft

TL;DR
This study searches archival VLA data for transient radio events in the Galactic center, finding two promising candidates that could indicate new astrophysical phenomena or imaging artifacts, but require further investigation.
Contribution
The paper presents a novel automated pipeline for detecting short-duration radio transients in archival VLA data of the Galactic center, identifying potential new transient sources.
Findings
Two promising transient candidates identified.
Estimated transient rate of 14^{+32}_{-12} per hour per square degree.
No counterparts found in other wavelengths.
Abstract
The Galactic center has some of the highest stellar densities in the Galaxy and a range of interstellar scattering properties that may aid in the detection of new radio-selected transient events. Here we describe a search for radio transients in the Galactic center using over 200 hours of archival data from the Very Large Array (VLA) at 5 and 8.4 GHz. Every observation of SgrA* from 19852005 has been searched using an automated processing and detection pipeline sensitive to transients with timescales between 30 seconds and five minutes with a typical detection threshold of 100 mJy. Eight possible candidates pass tests to filter false-positives from radio-frequency interference, calibration errors, and imaging artifacts. Two events are identified as promising candidates based on the smoothness of their light curves. Despite the high quality of their light curves, these…
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