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The intermediate Palomar Transient Factory (iPTF) autonomously responded toand promptly tiled the error region of the first gravitational wave eventGW150914 to search for an optical counterpart. Only a small fraction of thetotal localized region was immediately visible in the Northern night sky, dueboth to sun-angle and elevation constraints. Here, we report on the transientcandidates identified and rapid follow-up undertaken to determine the nature ofeach candidate. Even in the small area imaged of 126 sq deg, after extensivefiltering, 8 candidates were deemed worthy of additional follow-up. Within twohours, all 8 were spectroscopically classified by the Keck II telescope.Curiously, even though such events are rare, one of our candidates was asuperluminous supernova. We obtained radio data with the Jansky Very LargeArray and X-ray follow-up with the Swift satellite for this transient. None ofour candidates appear to be associated with the gravitational wave trigger,which is unsurprising given that GW150914 came from the merger of twostellar-mass black holes. This end-to-end discovery and follow-up campaignbodes well for future searches in this post-detection era of gravitationalwaves.

iPTF Search for an Optical Counterpart to Gravitational Wave Trigger GW150914