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We present results on number counts of Extremely Red Objects (EROs) in a 2850arcmin^2 near-infrared survey performed in European Large Area ISO Survey(ELAIS) fields at K<17.5. Counts of EROs are extended to brighter levels thanavailable previously, giving 0.002 +/- 0.001 arcmin^-2 at K<16.5 and consistentnumbers with literature values at fainter magnitudes. Photometric redshiftsfrom HYPERZ as well as GRASIL model SEDs of galaxies imply that our EROs arelocated in the range z=0.7-1.5, with the bulk of the population at z~1. Takingadvantage of the ISO data in the fields, we use mid-IR detections to constrainthe number of dusty EROs, and also discuss the superior capabilities of SpitzerSpace Telescope to detect dusty EROs. Both the mid-IR data and the use ofcolour-colour diagrammes indicate that at most 10-20% of the EROs in thisbright regime are dusty starbursting systems. The space density of our EROs,interpreted to be counterparts of local >2-3L^star massive galaxies at aroundz~1, is estimated to be approx. 2x10^-5 Mpc^-3, which is consistent with localvalues. Furthermore, the cumulative number counts at our bright magnitudes areremarkably well fitted by pure luminosity evolution models.Comment: A&A, accepted, 14 pages and 8 ps-fig

Number counts of bright extremely red objects: Evolved massive galaxies atz $\sim1$