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Short-period planets exhibit day-night temperature contrasts of hundreds tothousands of degrees K. They also exhibit eastward hotspot offsets whereby thehottest region on the planet is east of the substellar point; this has beenwidely interpreted as advection of heat due to eastward winds. We presentthermal phase observations of the hot Jupiter CoRoT-2b obtained with the IRACinstrument on the Spitzer Space Telescope. These measurements show the mostrobust detection to date of a westward hotspot offset of 23 $\pm$ 4 degrees, incontrast with the nine other planets with equivalent measurements. The peculiarinfrared flux map of CoRoT-2b may result from westward winds due tonon-synchronous rotation magnetic effects, or partial cloud coverage, thatobscures the emergent flux from the planet's eastern hemisphere.Non-synchronous rotation and magnetic effects may also explain the planet'sanomalously large radius. On the other hand, partial cloud coverage couldexplain the featureless dayside emission spectrum of the planet. If CoRoT-2b isnot tidally locked, then it means that our understanding of star-planet tidalinteraction is incomplete. If the westward offset is due to magnetic effects,our result represents an opportunity to study an exoplanet's magnetic field. Ifit has Eastern clouds, then it means that our understanding of large-scalecirculation on tidally locked planets is incomplete.

Detection of a Westward Hotspot Offset in the Atmosphere of a Hot Gas Giant CoRoT-2b