Main panel: histograms of the numbers of SNe reported to TNS between 11 July 2016 and 31 December 2019, as a function of the number of times Gaia scanned the location of the event from the date of detection of the event until 40 days after. The histograms are divided into two samples: blue independently detected and published by GSA, red not detected and published by GSA. Upper panel: fraction of the total number detected by GSA. Note that some of the SNe were first detected by Gaia more than 40 days after the event was reported to TNS, thus the N(scans) = 0, 1 bins are occupied.