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http://hdl.handle.net/20.500.12386/31999
Titolo: | Deep Upper Limit on the Optical Emission during a Hard X-Ray Burst from the Magnetar SGR J1935+2154 | Autori: | ZAMPIERI, Luca MEREGHETTI, Sandro Turolla, Roberto Naletto, Giampiero OCHNER, PAOLO BURTOVOI, ALEKSANDR FIORI, Michele GUIDORZI, CRISTIANO NICASTRO, LUCIANO PALAZZI, ELIANA PILIA, Maura POSSENTI, ANDREA |
Data pubblicazione: | 2022 | Rivista: | THE ASTROPHYSICAL JOURNAL LETTERS | Numero: | 925 | Fascicolo: | 2 | Da pagina:: | L16 | Abstract: | 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+Iqueye light curves around the time of the Fermi burst. No significant peak was detected with a significance above 3σ in an interval of 90 s around the burst. Correcting for interstellar extinction (A V ≃ 5.8 mag), the IFI+Iqueye upper limits to any possible optical burst from SGR J1935+2154 are V = 10.1 mag, V = 7.2 mag, and V = 5.8 mag for the 1 s, 10 ms, and 1 ms binned light curves, respectively. The corresponding extinction-corrected upper limits to the fluence (specific fluence) are 3.1 10-10 erg cm-2 (0.35 Jy s), 4.2 10-11 erg cm-2 (4.8 Jy •10 ms), and 1.6 10-11 erg cm-2 (17.9 Jy ms), orders of magnitude deeper than any previous simultaneous optical limit on a magnetar burst. The IFI+Iqueye measurement can also place a more stringent constraint on the spectral index of the optical to hard X-ray fluence of SGR J1935+2154, implying a spectrum steeper than ν 0.64. Fast optical timing observations of bursts associated with radio emission then have the potential to yield a detection. | URI: | http://hdl.handle.net/20.500.12386/31999 | URL: | https://api.elsevier.com/content/abstract/scopus_id/85124622225 https://iopscience.iop.org/article/10.3847/2041-8213/ac4b60 |
ISSN: | 2041-8205 | DOI: | 10.3847/2041-8213/ac4b60 | Fulltext: | open |
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