Extended Data Fig. 8: Localization and potential periodicity of the new γ-ray source.

a, The background mosaic grey pixels show the count map of 1 – 3 GeV photons detected between 1 November 2022 and 1 January 2023. The pixel size is 0.125° × 0.125°. The yellow plus symbol shows the best-localized position of the new γ-ray source, and the surrounding yellow contours show the corresponding 68%, 95%, and 99% confidence area. SN 2022jli, the red plus symbol, is within the 68% uncertainty region of the detected γ-ray source. The blazar candidate NVSS J003456-082820 is shown with the blue plus symbol and is within the 95% uncertainty region of the new γ-ray source. In the central 1.625° × 1.625° field, there is one detected γ-ray source from the LAT 12-year Source Catalog (4FGL-DR3), 4FGL J0035.8-0837. The black circle has a radius of 0.4° corresponding roughly to the 50% containment radius of the averaged PSF over the energy range between 1 GeV and 3 GeV. b, The distribution of 1 – 3 GeV photons of the new γ-ray source. The top panel shows the photon energy and detection time. The bottom panel shows the distribution after folding the light curve with a period of 12.4 days. The reference time (phase=0) corresponds to the minimum of the optical undulation profile. Most of the γ-ray photons come from the rising phase of the optical bump. The 11 photons are within the half-containment radius shown in a. c, The cumulative distribution of the maximum separation between any two photons that would be achieved by drawing N photons randomly distributed in a time range of 120 days.