Multi-wavelength light curve of PKS 0736+017 during February 2015. Panels a to g: H.E.S.S. integral flux above 100 GeV from the monoscopic analysis (in gray, the flux for the nights with no significant detection); Fermi-LAT integral flux above 100 MeV; Fermi-LAT photon index; Swift-XRT integral flux between 0.3 and 10 keV, corrected for absorption; Swift-UVOT (orange, light blue, blue, light violet, violet, and dark violet squares for the V, B, U, W1, M2, and W2 filter, respectively), ATOM (red squares for the R filter), Steward Observatory (orange and red triangles for the V and R filter, respectively), ASAS-SN (orange open circles for the V filter), and KAIT (red open circles, unfiltered fluxes, de-reddened); Steward Observatory broad-band polarization fraction; and Steward Observatory polarization position angle (both averaged over 5000–7000 Å). The vertical dashed red line indicates the time of the H.E.S.S. detection.