PKS 2052-47 shows a ~600-630 day gamma-ray quasi-periodic oscillation, consistent with earlier work, plus a tentative ~1050-1110 day secondary feature, both exceeding local significance thresholds against red-noise models.
The Astrophys- ical Journal Supplement Series 156, 13
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A multi-technique search for year-scale $\gamma$-ray quasi-periodic modulation in the high-redshift FSRQ PKS~2052$-$47
PKS 2052-47 shows a ~600-630 day gamma-ray quasi-periodic oscillation, consistent with earlier work, plus a tentative ~1050-1110 day secondary feature, both exceeding local significance thresholds against red-noise models.