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|Title:||Agile Observations of the Gravitational-Wave Event GW150914||Authors:||TAVANI, MARCO
Monte, E. Del
ANTONELLI, Lucio Angelo
Cattaneo, P. W.
PELLIZZONI, ALBERTO PAOLO
CARDILLO , MARTINA
|Issue Date:||2016||Journal:||THE ASTROPHYSICAL JOURNAL LETTERS||Number:||825||Issue:||1||First Page:||L4||Abstract:||We report the results of an extensive search through the AGILE data for a gamma-ray counterpart to the LIGO gravitational-wave (GW) event GW150914. Currently in spinning mode, AGILE has the potential of cover 80% of the sky with its gamma-ray instrument, more than 100 times a day. It turns out that AGILE came within a minute of the event time of observing the accessible GW150914 localization region. Interestingly, the gamma-ray detector exposed ∼65% of this region during the 100 s time intervals centered at -100 and +300 s from the event time. We determine a 2σ flux upper limit in the band 50 MeV-10 GeV, UL = 1.9 × 10<SUP>-8</SUP> erg cm<SUP>-2</SUP> s<SUP>-1</SUP>, obtained ∼300 s after the event. The timing of this measurement is the fastest ever obtained for GW150914, and significantly constrains the electromagnetic emission of a possible high-energy counterpart. We also carried out a search for a gamma-ray precursor and delayed emission over five timescales ranging from minutes to days: in particular, we obtained an optimal exposure during the interval -150/-30 s. In all these observations, we do not detect a significant signal associated with GW150914. We do not reveal the weak transient source reported by Fermi-GBM 0.4 s after the event time. However, even though a gamma-ray counterpart of the GW150914 event was not detected, the prospects for future AGILE observations of GW sources are decidedly promising.||URI:||http://hdl.handle.net/20.500.12386/29528||URL:||https://iopscience.iop.org/article/10.3847/2041-8205/825/1/L4||ISSN:||2041-8205||DOI:||10.3847/2041-8205/825/1/L4||Bibcode ADS:||2016ApJ...825L...4T||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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