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Title: | Agile Observations of the Gravitational-Wave Event GW150914 | Authors: | TAVANI, MARCO PITTORI, Carlotta VERRECCHIA, Francesco BULGARELLI, ANDREA GIULIANI, ANDREA Donnarumma, I. ARGAN, ANDREA TROIS, ALESSIO LUCARELLI, Fabrizio Marisaldi, M. Monte, E. Del EVANGELISTA, YURI FIORETTI, VALENTINA Zoli, A. PIANO, Giovanni Munar-Adrover, P. ANTONELLI, Lucio Angelo Barbiellini, G. CARAVEO, PATRIZIA Cattaneo, P. W. Costa, E. FEROCI, MARCO Ferrari, A. Longo, F. MEREGHETTI, Sandro MINERVINI, GABRIELE Morselli, A. PACCIANI, LUIGI PELLIZZONI, ALBERTO PAOLO Picozza, P. PILIA, Maura Rappoldi, A. Sabatini, S. VERCELLONE, STEFANO VITTORINI, VALERIO Giommi, P. Colafrancesco, S. CARDILLO , MARTINA Galli, M. FUSCHINO, FABIO |
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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Tavani_2016_ApJL_825_L4.pdf | Pdf editoriale | 1.98 MB | Adobe PDF | View/Open |
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