2019A&A...631A..62M -
Astronomy and Astrophysics, volume 631A, 62-62 (2019/11-1)
A cumulative search for hard X/γ-ray emission associated with fast radio bursts in Fermi/GBM data.
MARTONE R., GUIDORZI C., MARGUTTI R., NICASTRO L., AMATI L., FRONTERA F., MARONGIU M., ORLANDINI M. and VIRGILLI E.
Abstract (from CDS):
Context. Fast radio bursts (FRBs) are millisecond-long bursts uniquely detected at radio frequencies. FRB 131104 is the only case for which a γ-ray transient positionally and temporally consistent was claimed. This high-energy transient had a duration of ∼400 s and a 15-150keV fluence Sγ∼4x10–6erg/cm2. However, the association with the FRB is still debated.
Aims. We aim at testing the systematic presence of an associated transient high-energy counterpart throughout a sample of the FRB population.
Methods. We used an approach like that used in machine learning methodologies to accurately model the highly-variable Fermi/GBM instrumental background on a time interval comparable to the duration of the proposed γ-ray counterpart of FRB 131104. A possible γ-ray signal is then constrained considering sample average lightcurves.
Results. We constrain the fluence of the possible γ-ray signal in the 8-1000keV band down to 6.4x10–7(7.1x10–8)erg/cm2 for a 200-s (1-s) integration time. Furthermore, we found the radio-to-gamma fluence ratio to be η>108Jy(ms/erg)cm2.
Conclusions. Our fluence limits exclude ∼94% of Fermi/GBM detected long gamma-ray bursts and ∼96% of Fermi/GBM detected short gamma-ray bursts. In addition, our limits on the radio-to-gamma fluence ratio point to a different emission mechanism from that of magnetar giant flares. Finally, we exclude a γ-ray counterpart as fluent as the one possibly associated with FRB 131104 to be a common feature of FRBs.
Abstract Copyright:
© ESO 2019
Journal keyword(s):
gamma rays: general - gamma-ray burst: general - radio continuum: general
Simbad objects:
45
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