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We searched for an optical counterpart to the first gravitational wave sourcediscovered by LIGO (GW150914), using a combination of the Pan-STARRS1wide-field telescope and the PESSTO spectroscopic follow-up programme. As thefinal LIGO sky maps changed during analysis, the total probability of thesource being spatially coincident with our fields was finally only 4.2 percent. Therefore we discuss our results primarily as a demonstration of thesurvey capability of Pan-STARRS and spectroscopic capability of PESSTO. Wemapped out 442 square degrees of the northern sky region of the initial map. Wediscovered 56 astrophysical transients over a period of 41 days from thediscovery of the source. Of these, 19 were spectroscopically classified and afurther 13 have host galaxy redshifts. All transients appear to be fairlynormal supernovae and AGN variability and none is obviously linked withGW150914. We illustrate the sensitivity of our survey by defining parameterisedlightcurves with timescales of 4, 20 and 40 days and use the sensitivity of thePan-STARRS1 images to set limits on the luminosities of possible sources. ThePan-STARRS1 images reach limiting magnitudes of i = 19.2, 20.0 and 20.8respectively for the three timescales. For long timescale parameterisedlightcurves (with FWHM=~40d) we set upper limits of M_i <= -17.2 -0.9/+1.4 ifthe distance to GW150914 is D = 400 +/- 200Mpc. The number of type Ia SN wefind in the survey is similar to that expected from the cosmic SN rate,indicating a reasonably complete efficiency in recovering supernova liketransients out to D = 400 +/- 200 Mpc.

Pan-STARRS and PESSTO search for an optical counterpart to the LIGO gravitational wave source GW150914