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We present the lightcurves, spectra, and hardness-intensity diagram (HID) ofthe high mass X-ray binary V0332+53 using Fermi/GBM, MAXI, Swift/BAT, andINTEGRAL through its 2015 Type II outburst. We observe characteristic featuresin the X-ray emission (2-50 keV) due to periastron passages, the dynamicaltimescale of the accretion disc, and changes within the accretion columnbetween a radiation-dominated flow and a flow dominated by Coulombinteractions. Based on the HID and the light curves, the critical luminosity isobserved to decrease by ~5-7 percent during the outburst, signaling a decreasein the magnetic field.

Observations of V0332+53 during the 2015 Outburst using Fermi/GBM, MAXI, Swift, and INTEGRAL