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INTEGRAL gamma-ray upper limits on FRB180311

ATel #11431; Savchenko V., Ferrigno C., (ISDC, University of Geneva, CH), Panessa, F., Bazzano A., Ubertini P. (IASP-INAF, Italy) Kuulkers E. (ESA/ESTEC, The Netherlands), Keane E. (SKA Organisation, Jodrell Bank Observatory, UK)
on 16 Mar 2018; 10:11 UT
Credential Certification: Volodymyr Savchenko (Volodymyr.Savchenko@unige.ch)

Subjects: X-ray, Gamma Ray, Fast Radio Burst

A fast radio burst has been detected at the Parkes Telescope on 2018-03-11 at 04:11:54.80 UTC (ATeL #11396). The INTEGRAL observatory was taking data on a field centered at RA=260.177, Dec=-40.105, 43.0 degrees from the approximate FRB arrival direction (RA=21:31:33.42 Dec=-57:44:26.7). This orientation is rather favorable for a detection of any associated gamma-ray transient with INTEGRAL's all-sky detectors (see Savchenko et al., 2017, A&A 603, A46 for details). The best constraints can be achieved using the anti-coincidence shield ofthe spectrometer (SPI-ACS) or the imager (IBIS/ISGRI), depending on the assumed source spectrum and exact location. We inspected these data, which have a stable background within at least a 10-minute window of the FRB occurrence time, and derive an upper limit on any associated impulsive gamma-ray transient.
We estimate a 3-sigma upper limit on the 75-2000 keV fluence of 2.6e-7 erg/cm2 for a burst lasting less than 1 s with a characteristic short GRB spectrum (an exponentially cut-off power-law with alpha=-0.5 and Ep=600 keV) occurring at any time in the interval within 300 s around T0. For a typical long GRB spectrum (Band function with alpha=-1, beta=-2.5, and Ep=300 keV), the derived fluence upper limit in 8 s is 7.1e-7 erg/cm2 in the 75-2000 keV energy range. The limits are applicable within at least 5 deg around the approximate FRB180311 position.