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We carried out a detailed study of the temporal and broadband spectralbehaviour of one of the brightest misaligned active galaxies in gamma-rays, NGC1275 utilising 11 years of Fermi, and available Swift and AstroSatobservations. Based on the cumulative flux distribution of the gamma-raylightcurve, we identified four distinct activity states and noticed an increasein the baseline flux during the first three states. Similar nature of theincrease in the average flux was also noticed in X-ray and UV bands. A largeflaring activity in gamma-rays was noticed in the fourth state. The source wasobserved twice by AstroSat for shorter intervals (~days) during the longerobserving periods (~years) state 3 and 4. During AstroSat observing periods,the source gamma-ray flux was higher than the average flux observed duringlonger duration states. The increase in the average baseline flux from state 1to state 3 can be explained considering a corresponding increase of jetparticle normalisation. The inverse Comptonisation of synchrotron photonsexplained the average X-ray and gamma-ray emission by jet electrons during thefirst three longer duration states. However, during the shorter durationAstroSat observing periods, a shift of the synchrotron peak frequency wasnoticed, and the synchrotron emission of jet electrons well explained theobserved X-ray flux.

Multiwavelength monitoring of NGC 1275 over a decade: Evidence of a shift in synchrotron peak frequency and long-term multi-band flux increase