Bibcode
                                    
                            DOI
                                    
                            Oscoz, A.; Serra-Ricart, M.; Goicoechea, Luis Julian; Buitrago, Jesus; Mediavilla, Evencio
    Referencia bibliográfica
                                    Astrophysical Journal Letters v.470, p.L19
Fecha de publicación:
    
                        10
            
                        1996
            
  Número de citas
                                    13
                            Número de citas referidas
                                    13
                            Descripción
                                    Observations of the gravitational lens system 0957+561A, B in the R band
are presented in this Letter. The observations, taken with the 82 cm
IAC-80 telescope, at Teide Observatory, Spain, were made from the
beginning of 1996 February to June, as part of an on-going lens
monitoring program to obtain the time delay between the two components
of the system. By comparing our data with those previously published by
Kundic et al., we infer that a large delay (>500 days) is
inconsistent with both data sets.