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The cross sections for top-quark pair production in association with a photonare measured in a fiducial volume with the ATLAS detector at a centre-of-massenergy of 13 TeV. Results are presented using proton-proton collision datacollected by the LHC during 2015 and 2016, amounting to a total of 36.1fb$^{-1}$. This also presents the first $t\bar{t}\gamma$ cross-sectionmeasurements performed in the dilepton channels. Exactly one photon is requiredto have $p_{\text{T}} > 20$ GeV and be isolated based on track and calorimeterinformation. At least two (four) jets are required in the dilepton(single-lepton) channels, with at least one jet originating from a $b$-quark.Two separate neural network algorithms are used to help reduce the impactbackgrounds play in the final measurements. The Prompt Photon Tagger is trainedon information from energy deposits in the calorimeters to distinguish promptphotons from hadronic fake photons. The output of this neural network is fedinto the Event-level Discriminator that uses event information to classifysignal from the sum of all backgrounds. A maximum likelihood fit is performedon the output of the Event-level Discriminator to determine the fiducial crosssection of the signal process. The fiducial cross section for the single-leptonand dilepton channel are measured to be $521 \pm 9 \text{(stat.)} \pm 41\text{(sys.)}$ fb and $69 \pm 3 \text{(stat.)} \pm 4\text{(sys.)}$ fb,respectively. In total, eight cross-section measurements are performed and allagree with theoretical next-to-leading-order predictions.

Fiducial cross-section measurements of the production of a prompt photon  in association with a top-quark pair at $\sqrt{s}=13$ TeV with the ATLAS  detector at the LHC