Time history of the >100 MeV flux from ≤10° of the Sun revealing the 2013 Oct. 11 LAT event. Vertical dashed lines show the GOES start and end times. The inset shows 1 min accumulation LAT flux data points and arbitrarily scaled 50–100 keV count rates observed by Fermi/GBM. The dashed curve shows the GOES 1–8 Å profile (scale on right ordinate) and the ⟨−⟩ symbol the estimated time of the CME onset from the CDAW catalog. The vertical solid arrow depicts our estimate of the CME onset from inspection of SDO/AIA images; the type II radio emission began about 2 min later. The derivative of the 1–4 keV soft X-ray emission observed by Solar Assembly for X-rays (SAX) instrument on MESSENGER (Schlemm et al. 2007) that directly observed the flare is shown by the green dots. This reflects the hard X-ray profile of the flare.