TY - JOUR
T1 - Constraining Possible γ-Ray Burst Emission from GW230529 Using Swift-BAT and Fermi-GBM
AU - Ronchini, Samuele
AU - Bala, Suman
AU - Wood, Joshua
AU - Delaunay, James
AU - Dichiara, Simone
AU - Kennea, Jamie A.
AU - Parsotan, Tyler
AU - Raman, Gayathri
AU - Tohuvavohu, Aaron
AU - Adhikari, Naresh
AU - Bhat, Narayana P.
AU - Biscoveanu, Sylvia
AU - Bissaldi, Elisabetta
AU - Burns, Eric
AU - Campana, Sergio
AU - Chandra, Koustav
AU - Cleveland, William H.
AU - Dalessi, Sarah
AU - De Pasquale, Massimiliano
AU - García-Bellido, Juan
AU - Gasbarra, Claudio
AU - Giles, Misty M.
AU - Gupta, Ish
AU - Hartmann, Dieter
AU - Hristov, Boyan A.
AU - Hui, Michelle C.
AU - Kashyap, Rahul
AU - Kocevski, Daniel
AU - Mailyan, Bagrat
AU - Malacaria, Christian
AU - Nakano, Hiroyuki
AU - Principe, Giacomo
AU - Roberts, Oliver J.
AU - Sathyaprakash, Bangalore
AU - Shao, Lijing
AU - Troja, Eleonora
AU - Veres, Péter
AU - Wilson-Hodge, Colleen A.
N1 - Publisher Copyright:
© 2024. The Author(s). Published by the American Astronomical Society.
PY - 2024/7/1
Y1 - 2024/7/1
N2 - GW230529 is the first compact binary coalescence detected by the LIGO-Virgo-KAGRA collaboration with at least one component mass confidently in the lower mass gap, corresponding to the range 3-5 M ⊙. If interpreted as a neutron star-black hole merger, this event has the most symmetric mass ratio detected so far and therefore has a relatively high probability of producing electromagnetic (EM) emission. However, no EM counterpart has been reported. At the merger time t 0, Swift-BAT and Fermi-GBM together covered 100% of the sky. Performing a targeted search in a time window [t 0 − 20 s, t 0 + 20 s], we report no detection by the Swift-BAT and Fermi-GBM instruments. Combining the position-dependent γ-ray flux upper limits and the gravitational-wave posterior distribution of luminosity distance, sky localization, and inclination angle of the binary, we derive constraints on the characteristic luminosity and structure of the jet possibly launched during the merger. Assuming a top-hat jet structure, we exclude at 90% credibility the presence of a jet that has at the same time an on-axis isotropic luminosity ≳1048 erg s−1 in the bolometric band 1 keV-10 MeV and a jet opening angle ≳15°. Similar constraints are derived by testing other assumptions about the jet structure profile. Excluding GRB 170817A, the luminosity upper limits derived here are below the luminosity of any GRB observed so far.
AB - GW230529 is the first compact binary coalescence detected by the LIGO-Virgo-KAGRA collaboration with at least one component mass confidently in the lower mass gap, corresponding to the range 3-5 M ⊙. If interpreted as a neutron star-black hole merger, this event has the most symmetric mass ratio detected so far and therefore has a relatively high probability of producing electromagnetic (EM) emission. However, no EM counterpart has been reported. At the merger time t 0, Swift-BAT and Fermi-GBM together covered 100% of the sky. Performing a targeted search in a time window [t 0 − 20 s, t 0 + 20 s], we report no detection by the Swift-BAT and Fermi-GBM instruments. Combining the position-dependent γ-ray flux upper limits and the gravitational-wave posterior distribution of luminosity distance, sky localization, and inclination angle of the binary, we derive constraints on the characteristic luminosity and structure of the jet possibly launched during the merger. Assuming a top-hat jet structure, we exclude at 90% credibility the presence of a jet that has at the same time an on-axis isotropic luminosity ≳1048 erg s−1 in the bolometric band 1 keV-10 MeV and a jet opening angle ≳15°. Similar constraints are derived by testing other assumptions about the jet structure profile. Excluding GRB 170817A, the luminosity upper limits derived here are below the luminosity of any GRB observed so far.
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U2 - 10.3847/2041-8213/ad5d74
DO - 10.3847/2041-8213/ad5d74
M3 - Article
AN - SCOPUS:85199409444
SN - 2041-8205
VL - 970
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 1
M1 - L20
ER -