GASP observation of FRB 20121102A from the 2017 campaign. The plot, from the night of September 27, shows the flux in each 0.9-ms frame. In total, there were ≈13.7 million frames. Shown are the EMCCD counts (left y axis) from the FRB region in each frame (left y-axis) and the flux in mJy ms (right y axis). Also shown is the 5σ upper limit. From 13.7 million frames, we expected to observe 4.1 frames with a flux above 5σ. The fact that we see five frames above 5σ implies no significant enhancement is detected.