Abstract for Proposal 097082
Investigating the variability of the blazar PG 1553+113 across different timescales
PG 1553+113 is a high-frequency peaked BL Lac object, z=0.433, with evidence of periodic gamma-ray
modulation of 2.2 years, suggesting potential binary supermassive black holes. Prior studies reveal multicomponent
variability across energy bands and separate but connected emitting regions, with intra-night
variability in X-ray and a hint in TeV gamma rays. This proposal seeks to: (1) monitor long-term variability,
including periodicity, as a continuation of an ongoing campaign, (2) obtain precise multi-wavelength SEDs
including polarization, and (3) investigate intra-night variability. These observations will provide critical
insights into the jet structure, emission processes, and source geometry. We request 35 hours of MAGIC
monitoring, 4 hours of MAGIC deep campaign during IXPE observations, 8 hours (4+4) of MAGIC+LST for
ToO on bright flares. Additionally, we ask for 4 hours of XMM-Newton during IXPE campaign and 4 in the
first ToO, if visibility allows (30 ks in total).
Details on Observing Strategy and Trigger Criteria
Flux at E>150 GeV exceeds a particular threshold based on MAGIC monitoring.