GRB 190919B: Rapid optical rise explained as a flaring activity

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This article has an erratum: [https://doi.org/10.1051/0004-6361/202143010e]

Fig. 4.

Optical light curve of GRB 190919B, fitted with an empirical model consisting of a superposition of two smoothly broken power-law functions (see Sect. 3.1) to describe two pulses as discussed in Sect. 4.

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