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Old Q0957+561 data & software: 

Optical Monitoring

HST-STIS Spectra

Simple FORTRAN programs to apply the d2 test (accurate and robust time delay measurements)

 

Postgraduate Course on GL

 

ANGLES SCHOOL POSTER-PDF

 

Workshop 2004

 

WORKSHOP POSTER-PDF

   ► Photos

    Proceedings

 

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TELESCOPES

BINOCULARS

SDSS J1442+4055AB


Discovery of the optically bright, wide separation double quasar SDSS J1442+4055 (MNRAS)

    GTC spectra in 2016

A = red line   B = blue line  G1 = green line

 

   LT light curves in 2016 and 2017: we caught flaring activities in both images, estimated a time delay of about 25 days (top panel) and constructed a preliminary combined light curve (A is leading; bottom panel)