INTEGRAL gamma-ray upper limits on FRB180309
ATel #11387; 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 9 Mar 2018; 13:25 UT
Credential Certification: Carlo Ferrigno (Carlo.Ferrigno@unige.ch)
Subjects: Gamma Ray, Fast Radio Burst
A very high signal-to-noise fast radio burst has been detected at the Parkes Telescope on 2018-03-09 at 02:49:32.99 UTC (ATeL #11385). The INTEGRAL observatory was taking data on a field centered at RA=87.04, Dec=19.32, 130 degrees from the approximate FRB arrival direction (RA=321.2 Dec=-33.8). This orientation is not very favorable for a detection of any gamma-ray transient with INTEGRAL all-sky detectors (see Savchenko et al., 2017, A&A 603, A46 for details). The best constraints can be achieved using the anti-coincidence shields of the spectrometer (SPI-ACS) or the imager (IBIS/Veto). We inspected these data, which have a stable background within the hour around 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 5.7e-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 1.1e-6 erg/cm2 in the 75-2000 keV energy range.