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Title: AGILE OBSERVATIONS OF THE GRAVITATIONAL-WAVE EVENT GW150914

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 2 σ flux upper limit in the band 50 MeV–10 GeV, UL = 1.9 × 10{sup −8} erg cm{sup −2} s{sup −1}, 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 transientmore » 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.« less

Authors:
; ; ; ; ; ;  [1]; ; ; ;  [2]; ; ; ;  [3]; ;  [4];  [5];  [6];
  1. INAF-IAPS, via del Fosso del Cavaliere 100, I-00133 Roma (Italy)
  2. ASI Science Data Center (ASDC), Via del Politecnico, I-00133 Roma (Italy)
  3. INAF-IASF-Bologna, Via Gobetti 101, I-40129 Bologna (Italy)
  4. INAF-IASF Milano, via E.Bassini 15, I-20133 Milano (Italy)
  5. INAF, Osservatorio Astronomico di Cagliari, Poggio dei Pini, strada 54, I-09012 Capoterra (Italy)
  6. Dip. di Fisica, Universita’ di Trieste and INFN, Via Valerio 2, I-34127 Trieste (Italy)
Publication Date:
OSTI Identifier:
22654197
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 825; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; EMISSION; GAMMA RADIATION; GEV RANGE; GRAVITATIONAL WAVES; INTERFERENCE; MEV RANGE; PRECURSOR; SKY

Citation Formats

Tavani, M., Donnarumma, I., Argan, A., Monte, E. Del, Evangelista, Y., Piano, G., Munar-Adrover, P., Pittori, C., Verrecchia, F., Lucarelli, F., Antonelli, L. A., Bulgarelli, A., Marisaldi, M., Fioretti, V., Zoli, A., Giuliani, A., Caraveo, P., Trois, A., Barbiellini, G., Cattaneo, P. W., E-mail: victor@roma2.infn.it.it, and others, and. AGILE OBSERVATIONS OF THE GRAVITATIONAL-WAVE EVENT GW150914. United States: N. p., 2016. Web. doi:10.3847/2041-8205/825/1/L4.
Tavani, M., Donnarumma, I., Argan, A., Monte, E. Del, Evangelista, Y., Piano, G., Munar-Adrover, P., Pittori, C., Verrecchia, F., Lucarelli, F., Antonelli, L. A., Bulgarelli, A., Marisaldi, M., Fioretti, V., Zoli, A., Giuliani, A., Caraveo, P., Trois, A., Barbiellini, G., Cattaneo, P. W., E-mail: victor@roma2.infn.it.it, & others, and. AGILE OBSERVATIONS OF THE GRAVITATIONAL-WAVE EVENT GW150914. United States. doi:10.3847/2041-8205/825/1/L4.
Tavani, M., Donnarumma, I., Argan, A., Monte, E. Del, Evangelista, Y., Piano, G., Munar-Adrover, P., Pittori, C., Verrecchia, F., Lucarelli, F., Antonelli, L. A., Bulgarelli, A., Marisaldi, M., Fioretti, V., Zoli, A., Giuliani, A., Caraveo, P., Trois, A., Barbiellini, G., Cattaneo, P. W., E-mail: victor@roma2.infn.it.it, and others, and. Fri . "AGILE OBSERVATIONS OF THE GRAVITATIONAL-WAVE EVENT GW150914". United States. doi:10.3847/2041-8205/825/1/L4.
@article{osti_22654197,
title = {AGILE OBSERVATIONS OF THE GRAVITATIONAL-WAVE EVENT GW150914},
author = {Tavani, M. and Donnarumma, I. and Argan, A. and Monte, E. Del and Evangelista, Y. and Piano, G. and Munar-Adrover, P. and Pittori, C. and Verrecchia, F. and Lucarelli, F. and Antonelli, L. A. and Bulgarelli, A. and Marisaldi, M. and Fioretti, V. and Zoli, A. and Giuliani, A. and Caraveo, P. and Trois, A. and Barbiellini, G. and Cattaneo, P. W., E-mail: victor@roma2.infn.it.it and others, and},
abstractNote = {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 2 σ flux upper limit in the band 50 MeV–10 GeV, UL = 1.9 × 10{sup −8} erg cm{sup −2} s{sup −1}, 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.},
doi = {10.3847/2041-8205/825/1/L4},
journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 1,
volume = 825,
place = {United States},
year = {2016},
month = {7}
}