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On 14th September 2015, a transient gravitational wave (GW150914) wasdetected by the two LIGO detectors at Hanford and Livingston from thecoalescence of a binary black hole system located at a distance of about 400Mpc. We point out that GW150914 experienced a Shapiro delay due to thegravitational potential of the mass distribution along the line of sight ofabout 1800 days. Also, the near-simultaneous arrival of gravitons over afrequency range of about 100 Hz within a 0.2 second window allows us toconstrain any violations of Shapiro delay and Einstein's equivalence principlebetween the gravitons at different frequencies. From the calculated Shapirodelay and the observed duration of the signal, frequency-dependent violationsof the equivalence principle for gravitons are constrained to an accuracy of$\mathcal{O}(10^{-9})$

Constraints on frequency-dependent violations of Shapiro delay from GW150914