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Perspectives of observing the color indices of optical afterglows of gamma-ray bursts with ESA Gaia

Hudec, René; Šimon, Vojtěch; Pizzichini, Graziella

We propose a strategy for detecting and analyzing optical afterglows (OAs) of long gamma-ray bursts (GRBs) without the need to obtain their light curves. This approach is useful for the Gaia satellite, which provides sampled optical ultra-low-dispersion spectroscopic observations of the sky. For this purpose, we show that most OAs of long GRBs dis…