New targeted X-ray monitoring finds no strong evidence for the reported 2.1-year periodicity in PG 1553+113 but supports a long-term linear trend matching other wavelengths.
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Testing X-ray Periodicity and Long-Term Trend in PG 1553+113 via Targeted Swift-XRT Monitoring
New targeted X-ray monitoring finds no strong evidence for the reported 2.1-year periodicity in PG 1553+113 but supports a long-term linear trend matching other wavelengths.