Broad-line type Ic SN 2020bvc: Signatures of an off-axis gamma-ray burst afterglow

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Broad-line type Ic SN 2020bvc : Signatures of an off-axis gamma-ray burst afterglow. / Izzo, L.; Auchettl, K.; Hjorth, J.; De Colle, F.; Gall, C.; Angus, C. R.; Raimundo, S.; Ramirez-Ruiz, E.

In: Astronomy & Astrophysics, Vol. 639, L11, 21.07.2020.

Research output: Contribution to journalJournal articleResearchpeer-review

Harvard

Izzo, L, Auchettl, K, Hjorth, J, De Colle, F, Gall, C, Angus, CR, Raimundo, S & Ramirez-Ruiz, E 2020, 'Broad-line type Ic SN 2020bvc: Signatures of an off-axis gamma-ray burst afterglow', Astronomy & Astrophysics, vol. 639, L11. https://doi.org/10.1051/0004-6361/202038152

APA

Izzo, L., Auchettl, K., Hjorth, J., De Colle, F., Gall, C., Angus, C. R., ... Ramirez-Ruiz, E. (2020). Broad-line type Ic SN 2020bvc: Signatures of an off-axis gamma-ray burst afterglow. Astronomy & Astrophysics, 639, [L11]. https://doi.org/10.1051/0004-6361/202038152

Vancouver

Izzo L, Auchettl K, Hjorth J, De Colle F, Gall C, Angus CR et al. Broad-line type Ic SN 2020bvc: Signatures of an off-axis gamma-ray burst afterglow. Astronomy & Astrophysics. 2020 Jul 21;639. L11. https://doi.org/10.1051/0004-6361/202038152

Author

Izzo, L. ; Auchettl, K. ; Hjorth, J. ; De Colle, F. ; Gall, C. ; Angus, C. R. ; Raimundo, S. ; Ramirez-Ruiz, E. / Broad-line type Ic SN 2020bvc : Signatures of an off-axis gamma-ray burst afterglow. In: Astronomy & Astrophysics. 2020 ; Vol. 639.

Bibtex

@article{365a3bd238d84725a3284d31de75d168,
title = "Broad-line type Ic SN 2020bvc: Signatures of an off-axis gamma-ray burst afterglow",
abstract = "Long-duration gamma-ray bursts (GRBs) are almost unequivocally associated with very energetic, broad-line supernovae of Type Ic-BL. While the gamma-ray emission is emitted in narrow jets, the SN emits radiation isotropically. Therefore, it has been hypothesized that some SN Ic-BL not associated with GRBs arise from events with inner engines such as off-axis GRBs or choked jets. Here we present observations of the nearby (d=120 Mpc) SN 2020bvc (ASAS-SN 20bs) that support this scenario. Swift-UVOT observations reveal an early decline (up to two days after explosion), while optical spectra classify it as a SN Ic-BL with very high expansion velocities (approximate to 70 000 km s(-1)), similar to that found for the jet-cocoon emission in SN 2017iuk associated with GRB 171205A. Moreover, the Swift X-Ray Telescope and CXO X-ray Observatory detected X-ray emission only three days after the SN and decaying onward, which can be ascribed to an afterglow component. Cocoon and X-ray emission are both signatures of jet-powered GRBs. In the case of SN 2020bvc, we find that the jet is off axis (by approximate to 23 degrees), as also indicated by the lack of early (approximate to 1 day) X-ray emission, which explains why no coincident GRB was detected promptly or in archival data. These observations suggest that SN 2020bvc is the first orphan GRB detected through its associated SN emission.",
keywords = "gamma-ray burst: general, supernovae: individual: SN2020bvc, stars: jets, LIGHT CURVES, SUPERNOVA, EVOLUTION, JETS, EMISSION, COCOON, GRB-060218, SPECTRA, MODEL, RATES",
author = "L. Izzo and K. Auchettl and J. Hjorth and {De Colle}, F. and C. Gall and Angus, {C. R.} and S. Raimundo and E. Ramirez-Ruiz",
year = "2020",
month = "7",
day = "21",
doi = "10.1051/0004-6361/202038152",
language = "English",
volume = "639",
journal = "Astronomy & Astrophysics",
issn = "0004-6361",
publisher = "E D P Sciences",

}

RIS

TY - JOUR

T1 - Broad-line type Ic SN 2020bvc

T2 - Signatures of an off-axis gamma-ray burst afterglow

AU - Izzo, L.

AU - Auchettl, K.

AU - Hjorth, J.

AU - De Colle, F.

AU - Gall, C.

AU - Angus, C. R.

AU - Raimundo, S.

AU - Ramirez-Ruiz, E.

PY - 2020/7/21

Y1 - 2020/7/21

N2 - Long-duration gamma-ray bursts (GRBs) are almost unequivocally associated with very energetic, broad-line supernovae of Type Ic-BL. While the gamma-ray emission is emitted in narrow jets, the SN emits radiation isotropically. Therefore, it has been hypothesized that some SN Ic-BL not associated with GRBs arise from events with inner engines such as off-axis GRBs or choked jets. Here we present observations of the nearby (d=120 Mpc) SN 2020bvc (ASAS-SN 20bs) that support this scenario. Swift-UVOT observations reveal an early decline (up to two days after explosion), while optical spectra classify it as a SN Ic-BL with very high expansion velocities (approximate to 70 000 km s(-1)), similar to that found for the jet-cocoon emission in SN 2017iuk associated with GRB 171205A. Moreover, the Swift X-Ray Telescope and CXO X-ray Observatory detected X-ray emission only three days after the SN and decaying onward, which can be ascribed to an afterglow component. Cocoon and X-ray emission are both signatures of jet-powered GRBs. In the case of SN 2020bvc, we find that the jet is off axis (by approximate to 23 degrees), as also indicated by the lack of early (approximate to 1 day) X-ray emission, which explains why no coincident GRB was detected promptly or in archival data. These observations suggest that SN 2020bvc is the first orphan GRB detected through its associated SN emission.

AB - Long-duration gamma-ray bursts (GRBs) are almost unequivocally associated with very energetic, broad-line supernovae of Type Ic-BL. While the gamma-ray emission is emitted in narrow jets, the SN emits radiation isotropically. Therefore, it has been hypothesized that some SN Ic-BL not associated with GRBs arise from events with inner engines such as off-axis GRBs or choked jets. Here we present observations of the nearby (d=120 Mpc) SN 2020bvc (ASAS-SN 20bs) that support this scenario. Swift-UVOT observations reveal an early decline (up to two days after explosion), while optical spectra classify it as a SN Ic-BL with very high expansion velocities (approximate to 70 000 km s(-1)), similar to that found for the jet-cocoon emission in SN 2017iuk associated with GRB 171205A. Moreover, the Swift X-Ray Telescope and CXO X-ray Observatory detected X-ray emission only three days after the SN and decaying onward, which can be ascribed to an afterglow component. Cocoon and X-ray emission are both signatures of jet-powered GRBs. In the case of SN 2020bvc, we find that the jet is off axis (by approximate to 23 degrees), as also indicated by the lack of early (approximate to 1 day) X-ray emission, which explains why no coincident GRB was detected promptly or in archival data. These observations suggest that SN 2020bvc is the first orphan GRB detected through its associated SN emission.

KW - gamma-ray burst: general

KW - supernovae: individual: SN2020bvc

KW - stars: jets

KW - LIGHT CURVES

KW - SUPERNOVA

KW - EVOLUTION

KW - JETS

KW - EMISSION

KW - COCOON

KW - GRB-060218

KW - SPECTRA

KW - MODEL

KW - RATES

U2 - 10.1051/0004-6361/202038152

DO - 10.1051/0004-6361/202038152

M3 - Journal article

VL - 639

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

SN - 0004-6361

M1 - L11

ER -

ID: 246780164