AGILE Observations of the Gravitational-wave Source GW170104

F. Verrecchia; M. Tavani; A. Ursi; A. Argan; C. Pittori; I. Donnarumma; A. Bulgarelli; F. Fuschino; C. Labanti; M. Marisaldi; Y. Evangelista; G. Minervini; A. Giuliani; M. Cardillo; F. Longo; F. Lucarelli; P. Munar-Adrover; G. Piano; M. Pilia; V. Fioretti; N. Parmiggiani; A. Trois; E. Del Monte; L. A. Antonelli; G. Barbiellini; P. Caraveo; P. W. Cattaneo; S. Colafrancesco; E. Costa; F. D'Amico; M. Feroci; A. Ferrari; A. Morselli; L. Pacciani; F. Paoletti; A. Pellizzoni; P. Picozza; A. Rappoldi; S. Vercellone

doi:10.3847/2041-8213/aa8224

AGILE Observations of the Gravitational-wave Source GW170104

F. Verrecchia, M. Tavani, A. Ursi, A. Argan, C. Pittori, I. Donnarumma, A. Bulgarelli, F. Fuschino, C. Labanti, M. Marisaldi, Y. Evangelista, G. Minervini, A. Giuliani, M. Cardillo, F. Longo, F. Lucarelli, P. Munar-Adrover, G. Piano, M. Pilia, V. FiorettiN. Parmiggiani, A. Trois, E. Del Monte, L. A. Antonelli, G. Barbiellini, P. Caraveo, P. W. Cattaneo, S. Colafrancesco, E. Costa, F. D'Amico, M. Feroci, A. Ferrari, A. Morselli, L. Pacciani, F. Paoletti, A. Pellizzoni, P. Picozza, A. Rappoldi, S. Vercellone

Department of Physics

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Abstract

© 2017. The American Astronomical Society. All rights reserved.. The LIGO/Virgo Collaboration (LVC) detected on 2017 January 4 a significant gravitational-wave (GW) event (now named GW170104). We report in this Letter the main results obtained from the analysis of hard X-ray and gamma-ray data of the AGILE mission that repeatedly observed the GW170104 localization region (LR). At the LVC detection time T 0 AGILE observed about 36% of the LR. The gamma-ray imaging detector did not reveal any significant emission in the energy range 50 MeV-30 GeV. Furthermore, no significant gamma-ray transients were detected in the LR that was repeatedly exposed over timescales of minutes, hours, and days. We also searched for transient emission using data near T 0 of the omnidirectional detector MCAL operating in the energy band 0.4-100 MeV. A refined analysis of MCAL data shows the existence of a weak event (that we call "E2") with a signal-to-noise ratio of 4.4σ lasting about 32 ms and occurring 0.46 ± 0.05 s before T 0. A study of the MCAL background and of the false-alarm rate of E2 leads to the determination of a post-trial significance between 2.4σ and 2.7σ for a temporal coincidence with GW170104. We note that E2 has characteristics similar to those detected from the weak precursor of GRB 090510. The candidate event E2 is worth consideration for simultaneous detection by other satellites. If associated with GW170104, it shows emission in the MeV band of a short burst preceding the final coalescence by 0.46 s and involving ∼10-7 of the total rest mass energy of the system.

Original language	English
Article number	L20
Journal	Astrophysical Journal Letters
Volume	847
Issue number	2
DOIs	https://doi.org/10.3847/2041-8213/aa8224
Publication status	Published - 1 Oct 2017

Keywords

gamma rays: general
gravitational waves

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10.3847/2041-8213/aa8224

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Verrecchia, F., Tavani, M., Ursi, A., Argan, A., Pittori, C., Donnarumma, I., Bulgarelli, A., Fuschino, F., Labanti, C., Marisaldi, M., Evangelista, Y., Minervini, G., Giuliani, A., Cardillo, M., Longo, F., Lucarelli, F., Munar-Adrover, P., Piano, G., Pilia, M., ... Vercellone, S. (2017). AGILE Observations of the Gravitational-wave Source GW170104. Astrophysical Journal Letters, 847(2), Article L20. https://doi.org/10.3847/2041-8213/aa8224

@article{9d6bb81317514d419b60125e620a26c3,

title = "AGILE Observations of the Gravitational-wave Source GW170104",

abstract = "{\textcopyright} 2017. The American Astronomical Society. All rights reserved.. The LIGO/Virgo Collaboration (LVC) detected on 2017 January 4 a significant gravitational-wave (GW) event (now named GW170104). We report in this Letter the main results obtained from the analysis of hard X-ray and gamma-ray data of the AGILE mission that repeatedly observed the GW170104 localization region (LR). At the LVC detection time T 0 AGILE observed about 36% of the LR. The gamma-ray imaging detector did not reveal any significant emission in the energy range 50 MeV-30 GeV. Furthermore, no significant gamma-ray transients were detected in the LR that was repeatedly exposed over timescales of minutes, hours, and days. We also searched for transient emission using data near T 0 of the omnidirectional detector MCAL operating in the energy band 0.4-100 MeV. A refined analysis of MCAL data shows the existence of a weak event (that we call {"}E2{"}) with a signal-to-noise ratio of 4.4σ lasting about 32 ms and occurring 0.46 ± 0.05 s before T 0. A study of the MCAL background and of the false-alarm rate of E2 leads to the determination of a post-trial significance between 2.4σ and 2.7σ for a temporal coincidence with GW170104. We note that E2 has characteristics similar to those detected from the weak precursor of GRB 090510. The candidate event E2 is worth consideration for simultaneous detection by other satellites. If associated with GW170104, it shows emission in the MeV band of a short burst preceding the final coalescence by 0.46 s and involving ∼10-7 of the total rest mass energy of the system.",

keywords = "gamma rays: general, gravitational waves",

author = "F. Verrecchia and M. Tavani and A. Ursi and A. Argan and C. Pittori and I. Donnarumma and A. Bulgarelli and F. Fuschino and C. Labanti and M. Marisaldi and Y. Evangelista and G. Minervini and A. Giuliani and M. Cardillo and F. Longo and F. Lucarelli and P. Munar-Adrover and G. Piano and M. Pilia and V. Fioretti and N. Parmiggiani and A. Trois and Monte, {E. Del} and Antonelli, {L. A.} and G. Barbiellini and P. Caraveo and Cattaneo, {P. W.} and S. Colafrancesco and E. Costa and F. D'Amico and M. Feroci and A. Ferrari and A. Morselli and L. Pacciani and F. Paoletti and A. Pellizzoni and P. Picozza and A. Rappoldi and S. Vercellone",

year = "2017",

month = oct,

day = "1",

doi = "10.3847/2041-8213/aa8224",

language = "English",

volume = "847",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

number = "2",

}

Verrecchia, F, Tavani, M, Ursi, A, Argan, A, Pittori, C, Donnarumma, I, Bulgarelli, A, Fuschino, F, Labanti, C, Marisaldi, M, Evangelista, Y, Minervini, G, Giuliani, A, Cardillo, M, Longo, F, Lucarelli, F, Munar-Adrover, P, Piano, G, Pilia, M, Fioretti, V, Parmiggiani, N, Trois, A, Monte, ED, Antonelli, LA, Barbiellini, G, Caraveo, P, Cattaneo, PW, Colafrancesco, S, Costa, E, D'Amico, F, Feroci, M, Ferrari, A, Morselli, A, Pacciani, L, Paoletti, F, Pellizzoni, A, Picozza, P, Rappoldi, A & Vercellone, S 2017, 'AGILE Observations of the Gravitational-wave Source GW170104', Astrophysical Journal Letters, vol. 847, no. 2, L20. https://doi.org/10.3847/2041-8213/aa8224

TY - JOUR

T1 - AGILE Observations of the Gravitational-wave Source GW170104

AU - Verrecchia, F.

AU - Tavani, M.

AU - Ursi, A.

AU - Argan, A.

AU - Pittori, C.

AU - Donnarumma, I.

AU - Bulgarelli, A.

AU - Fuschino, F.

AU - Labanti, C.

AU - Marisaldi, M.

AU - Evangelista, Y.

AU - Minervini, G.

AU - Giuliani, A.

AU - Cardillo, M.

AU - Longo, F.

AU - Lucarelli, F.

AU - Munar-Adrover, P.

AU - Piano, G.

AU - Pilia, M.

AU - Fioretti, V.

AU - Parmiggiani, N.

AU - Trois, A.

AU - Monte, E. Del

AU - Antonelli, L. A.

AU - Barbiellini, G.

AU - Caraveo, P.

AU - Cattaneo, P. W.

AU - Colafrancesco, S.

AU - Costa, E.

AU - D'Amico, F.

AU - Feroci, M.

AU - Ferrari, A.

AU - Morselli, A.

AU - Pacciani, L.

AU - Paoletti, F.

AU - Pellizzoni, A.

AU - Picozza, P.

AU - Rappoldi, A.

AU - Vercellone, S.

PY - 2017/10/1

Y1 - 2017/10/1

N2 - © 2017. The American Astronomical Society. All rights reserved.. The LIGO/Virgo Collaboration (LVC) detected on 2017 January 4 a significant gravitational-wave (GW) event (now named GW170104). We report in this Letter the main results obtained from the analysis of hard X-ray and gamma-ray data of the AGILE mission that repeatedly observed the GW170104 localization region (LR). At the LVC detection time T 0 AGILE observed about 36% of the LR. The gamma-ray imaging detector did not reveal any significant emission in the energy range 50 MeV-30 GeV. Furthermore, no significant gamma-ray transients were detected in the LR that was repeatedly exposed over timescales of minutes, hours, and days. We also searched for transient emission using data near T 0 of the omnidirectional detector MCAL operating in the energy band 0.4-100 MeV. A refined analysis of MCAL data shows the existence of a weak event (that we call "E2") with a signal-to-noise ratio of 4.4σ lasting about 32 ms and occurring 0.46 ± 0.05 s before T 0. A study of the MCAL background and of the false-alarm rate of E2 leads to the determination of a post-trial significance between 2.4σ and 2.7σ for a temporal coincidence with GW170104. We note that E2 has characteristics similar to those detected from the weak precursor of GRB 090510. The candidate event E2 is worth consideration for simultaneous detection by other satellites. If associated with GW170104, it shows emission in the MeV band of a short burst preceding the final coalescence by 0.46 s and involving ∼10-7 of the total rest mass energy of the system.

AB - © 2017. The American Astronomical Society. All rights reserved.. The LIGO/Virgo Collaboration (LVC) detected on 2017 January 4 a significant gravitational-wave (GW) event (now named GW170104). We report in this Letter the main results obtained from the analysis of hard X-ray and gamma-ray data of the AGILE mission that repeatedly observed the GW170104 localization region (LR). At the LVC detection time T 0 AGILE observed about 36% of the LR. The gamma-ray imaging detector did not reveal any significant emission in the energy range 50 MeV-30 GeV. Furthermore, no significant gamma-ray transients were detected in the LR that was repeatedly exposed over timescales of minutes, hours, and days. We also searched for transient emission using data near T 0 of the omnidirectional detector MCAL operating in the energy band 0.4-100 MeV. A refined analysis of MCAL data shows the existence of a weak event (that we call "E2") with a signal-to-noise ratio of 4.4σ lasting about 32 ms and occurring 0.46 ± 0.05 s before T 0. A study of the MCAL background and of the false-alarm rate of E2 leads to the determination of a post-trial significance between 2.4σ and 2.7σ for a temporal coincidence with GW170104. We note that E2 has characteristics similar to those detected from the weak precursor of GRB 090510. The candidate event E2 is worth consideration for simultaneous detection by other satellites. If associated with GW170104, it shows emission in the MeV band of a short burst preceding the final coalescence by 0.46 s and involving ∼10-7 of the total rest mass energy of the system.

KW - gamma rays: general

KW - gravitational waves

U2 - 10.3847/2041-8213/aa8224

DO - 10.3847/2041-8213/aa8224

M3 - Article

SN - 2041-8205

VL - 847

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 2

M1 - L20

ER -

AGILE Observations of the Gravitational-wave Source GW170104

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