The GROUSE project - II. Detection of the Ks-band secondary eclipse of exoplanet HAT-P-1bE. J. W. de Mooij, R. J. de Kok, S. V. Nefs and I. A. G. SnellenA&A, 528 (2011) A49DOI: https://doi.org/10.1051/0004-6361/201016142