Deep Upper Limit on the Optical Emission during a Hard X-Ray Burst from the Magnetar SGR J1935+2154

@article{Zampieri2022DeepUL,
  title={Deep Upper Limit on the Optical Emission during a Hard X-Ray Burst from the Magnetar SGR J1935+2154},
  author={Luca Zampieri and Sandro Mereghetti and Roberto Turolla and Giampiero Naletto and Paolo Ochner and Aleksandr Burtovoi and Michele Fiori and Cristiano Guidorzi and Luciano Nicastro and Eliana Palazzi and Maura Pilia and Andrea Possenti},
  journal={The Astrophysical Journal Letters},
  year={2022},
  volume={925}
}
In 2021 September the magnetar SGR J1935+2154 entered a stage of burst/flaring activity in the hard X-ray band. On 2021 September 10, we observed SGR J1935+2154 with the fiber-fed fast optical photon counter IFI+Iqueye, mounted at the 1.22 m Galileo telescope in Asiago. During one of the IFI+Iqueye observing windows, a hard X-ray burst was detected with the Fermi Gamma-ray Burst Monitor. We performed a search for any significant increase in the count rate on the 1 s, 10 ms, and 1 ms binned IFI… 

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