With an instantaneous view of 70% of the sky, the Fermi Gamma-ray Burst Monitor (GBM) is an excellent partner in the search for electromagnetic counterparts to gravitational-wave (GW) events. GBM observations at the time of the Laser Interferometer Gravitational-wave Observatory (LIGO) event GW150914 reveal the presence of a weak transient above 50 keV, 0.4 s after the GW event, with a false-alarm probability of 0.0022 (2.9σ). This weak transient lasting 1 s was not detected by any other instrument and does not appear to be connected with other previously known astrophysical, solar, terrestrial, or magnetospheric activity. Its localization is ill-constrained but consistent with the direction of GW150914. The duration and spectrum of the transient event are consistent with a weak short gamma-ray burst (GRB) arriving at a large angle to the direction in which Fermi was pointing where the GBM detector response is not optimal. If the GBM transient is associated with GW150914, then this electromagnetic signal from a stellar mass black hole binary merger is unexpected. We calculate a luminosity in hard X-ray emission between 1 keV and 10 MeV of erg s-1. Future joint observations of GW events by LIGO/Virgo and Fermi GBM could reveal whether the weak transient reported here is a plausible counterpart to GW150914 or a chance coincidence, and will further probe the connection between compact binary mergers and short GRBs.

Fermi GBM observations of LIGO gravitational-wave event GW150914 / Connaughton, V.; Burns, E.; Goldstein, A.; Blackburn, L.; Briggs, M. S.; Zhang, B. B.; Camp, J.; Christensen, N.; Hui, C. M.; Jenke, P.; Littenberg, T.; Mcenery, J. E.; Racusin, J.; Shawhan, P.; Singer, L.; Veitch, J.; Wilson Hodge, C. A.; Bhat, P. N.; Bissaldi, Elisabetta; Cleveland, W.; Fitzpatrick, G.; Giles, M. M.; Gibby, M. H.; Von Kienlin, A.; Kippen, R. M.; Mcbreen, S.; Mailyan, B.; Meegan, C. A.; Paciesas, W. S.; Preece, R. D.; Roberts, O. J.; Sparke, L.; Stanbro, M.; Toelge, K.; Veres, P.. - In: THE ASTROPHYSICAL JOURNAL LETTERS. - ISSN 2041-8205. - 826:1(2016). [10.3847/2041-8205/826/1/L6]

Fermi GBM observations of LIGO gravitational-wave event GW150914

BISSALDI, Elisabetta;
2016-01-01

Abstract

With an instantaneous view of 70% of the sky, the Fermi Gamma-ray Burst Monitor (GBM) is an excellent partner in the search for electromagnetic counterparts to gravitational-wave (GW) events. GBM observations at the time of the Laser Interferometer Gravitational-wave Observatory (LIGO) event GW150914 reveal the presence of a weak transient above 50 keV, 0.4 s after the GW event, with a false-alarm probability of 0.0022 (2.9σ). This weak transient lasting 1 s was not detected by any other instrument and does not appear to be connected with other previously known astrophysical, solar, terrestrial, or magnetospheric activity. Its localization is ill-constrained but consistent with the direction of GW150914. The duration and spectrum of the transient event are consistent with a weak short gamma-ray burst (GRB) arriving at a large angle to the direction in which Fermi was pointing where the GBM detector response is not optimal. If the GBM transient is associated with GW150914, then this electromagnetic signal from a stellar mass black hole binary merger is unexpected. We calculate a luminosity in hard X-ray emission between 1 keV and 10 MeV of erg s-1. Future joint observations of GW events by LIGO/Virgo and Fermi GBM could reveal whether the weak transient reported here is a plausible counterpart to GW150914 or a chance coincidence, and will further probe the connection between compact binary mergers and short GRBs.
2016
Fermi GBM observations of LIGO gravitational-wave event GW150914 / Connaughton, V.; Burns, E.; Goldstein, A.; Blackburn, L.; Briggs, M. S.; Zhang, B. B.; Camp, J.; Christensen, N.; Hui, C. M.; Jenke, P.; Littenberg, T.; Mcenery, J. E.; Racusin, J.; Shawhan, P.; Singer, L.; Veitch, J.; Wilson Hodge, C. A.; Bhat, P. N.; Bissaldi, Elisabetta; Cleveland, W.; Fitzpatrick, G.; Giles, M. M.; Gibby, M. H.; Von Kienlin, A.; Kippen, R. M.; Mcbreen, S.; Mailyan, B.; Meegan, C. A.; Paciesas, W. S.; Preece, R. D.; Roberts, O. J.; Sparke, L.; Stanbro, M.; Toelge, K.; Veres, P.. - In: THE ASTROPHYSICAL JOURNAL LETTERS. - ISSN 2041-8205. - 826:1(2016). [10.3847/2041-8205/826/1/L6]
File in questo prodotto:
File Dimensione Formato  
Connaughton_2016_ApJL_826_L6(3).pdf

accesso aperto

Tipologia: Versione editoriale
Licenza: Tutti i diritti riservati
Dimensione 2.15 MB
Formato Adobe PDF
2.15 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/87742
Citazioni
  • Scopus 271
  • ???jsp.display-item.citation.isi??? 232
social impact