We report on our Galactic plane searches for magnetars in the archival Chandra X-ray Observatory (CXO) data. We summarize the properties of known magnetars and use them to establish a procedure for magnetar searches. The procedure includes four steps: source finding, spectral characterization, optical counterpart checks, and period searches. We searched 1,282 archival CXO observations, found 32,838 X-ray sources, and selected 25 intriguing candidates using the developed procedure. Although we do not firmly identify a magnetar among them, we significantly reduced the number of targets in future magnetar searches to be done with better X-ray telescopes.

1. INTRODUCTION
 2. BASIC PROPERTIES OF KNOWNMAGNETARS
 3. OBSERVATIONAL DATA ANALYSIS ANDRESULTS
  3.1 Magnetar Search Procedure and Data Analysis
  3.2 Verification of the Procedure and Analysis Results
 4. DISCUSSION AND CONCLUSIONS
 REFERENCES

• Woochan Park(Department of Astronomy and Space Science, Chungbuk National University)
• Hongjun An(Department of Astronomy and Space Science, Chungbuk National University) Corresponding Author