The optical transient of the faint gamma-ray burst GRB 990308 was detected by the QUEST camera on the Venezuelan 1 m Schmidt telescope starting 3.28 hr after the burst. Our photometry gives V=18.32+/-0.07, R=18.14+/-0.06, B=18.65+/-0.23, and R=18.22+/-0.05 for times ranging from 3.28 to 3.47 hr after the burst. The colors correspond to a spectral
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Discovery of the Optical Transient of GRB 990308Schaefer, Bradley E. et al.101999
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Discovery of the X-ray burster SAX J1752.3-3138
During a 50 ks monitoring observation of the Galactic bulge performed in September 1999 by the Wide Field Cameras on board the BeppoSAX satellite, an X-ray burst was detected from a sky position ~ 3degr off the Galactic centre. No previously known X-ray sources are located within the position error circle of the observed burst. The new burster, SAX
Cocchi, M. et al.Fecha de publicación:
102001 -
Discovery of very High Energy γ-Rays from the Blazar S5 0716+714
The MAGIC Collaboration reports the detection of the blazar S5 0716+714 (z = 0.31 ± 0.08) in very high energy gamma rays. The observations were performed in 2007 November and in 2008 April, and were triggered by the Kungliga Vetenskapliga Akademi telescope due to the high optical state of the object. An overall significance of the signal accounts
Anderhub, H. et al.Fecha de publicación:
102009 -
Discovery of Young, Isolated Planetary Mass Objects in the σ Orionis Star Cluster
We present the discovery by optical and near-infrared imaging of an extremely red, low-luminosity population of isolated objects in the young, nearby stellar cluster around the multiple, massive star σ Orionis. The proximity (352 parsecs), youth (1 million to 5 million years), and low internal extinction make this cluster an ideal site to explore
Zapatero Osorio, M. R. et al.Fecha de publicación:
102000 -
Discriminating between unresolved point sources and `negative' Sunyaev-Zel'dovich clusters in cosmic microwave background maps
Clusters of galaxies produce negative features at wavelengths λ > 1.25 mm in cosmic microwave background (CMB) maps by means of the thermal Sunyaev-Zel'dovich (SZ) effect, while point radio sources produce positive peaks. This fact implies that a distribution of unresolved SZ clusters could be detected using the negative asymmetry introduced in the
Rubiño-Martín, J. A. et al.Fecha de publicación:
102003 -
Disproving the validated planets K2-78b, K2-82b, and K2-92b. The importance of independently confirming planetary candidates
Context. Transiting super-Earths orbiting bright stars in short orbital periods are interesting targets for the study of planetary atmospheres. Aims: While selecting super-Earths suitable for further characterisation from the ground from a list of confirmed and validated exoplanets detected by K2, we found some suspicious cases that led to us
Cabrera, J. et al.Fecha de publicación:
102017