JWST and HST observations of the host galaxy and supernova, SN 2024aihh in EP240801a at z=1.67
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| Main Authors: | , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866914197993947136 |
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| author | van Hoof, Agnes P. C. Levan, Andrew J. Jonker, Peter G. Fraser, Morgan Izzo, Luca Fruchter, Andrew S. van Dalen, Joyce N. D. Tanvir, Nial R. Hjorth, Jens Martin-Carrillo, Antonio Sarin, Nikhil Cotter, Laura C. Quirola-Vásquez, Jonathan A. Ravasio, Maria E. Sánchez-Sierras, Javi Torres, Manuel A. P. Jiang, Shuai-Qing Xu, Dong |
| author_facet | van Hoof, Agnes P. C. Levan, Andrew J. Jonker, Peter G. Fraser, Morgan Izzo, Luca Fruchter, Andrew S. van Dalen, Joyce N. D. Tanvir, Nial R. Hjorth, Jens Martin-Carrillo, Antonio Sarin, Nikhil Cotter, Laura C. Quirola-Vásquez, Jonathan A. Ravasio, Maria E. Sánchez-Sierras, Javi Torres, Manuel A. P. Jiang, Shuai-Qing Xu, Dong |
| contents | We present James Webb Space Telescope (JWST) and Hubble Space Telescope (HST) observations of the counterpart of EP240801a, at z=1.67, the first fast X-ray transient (FXT) identified as an X-ray flash (XRF) by the Einstein Probe (EP) and Fermi-GBM. Our observations reveal strong photometric and spectroscopic evidence for an associated broad-lined Type Ic supernova (SN) SN 2024aihh, the most distant spectroscopically identified gamma ray-burst (GRB)-SN to date. The SN exhibits similar luminosity and light curve evolution to the proto-type GRB-SN 1998bw with an absolute magnitude of the SN at $\sim$23 days rest-frame of $M_{F140W} \approx$-19 mag. The SN is located in a host galaxy with complex morphology at a large ($\sim$6 kpc) offset in a region of relatively low surface brightness. The region around the SN has a modest star formation rate and is dominated by an intermediate mass-weighted age (1.4$\pm$0.3 Gyr) population, despite the apparent presence of a young, massive broad-lined Type Ic SN progenitor. These observations demonstrate that observations with HST and JWST can greatly extend the redshift range over which the GRB/FXT-SN connection can be studied, including in relatively low luminosity, X-ray rich events. They demonstrate little apparent evolution in the SN properties from local examples despite EP240801a originating from an epoch 10 Gyr ago. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_11572 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | JWST and HST observations of the host galaxy and supernova, SN 2024aihh in EP240801a at z=1.67 van Hoof, Agnes P. C. Levan, Andrew J. Jonker, Peter G. Fraser, Morgan Izzo, Luca Fruchter, Andrew S. van Dalen, Joyce N. D. Tanvir, Nial R. Hjorth, Jens Martin-Carrillo, Antonio Sarin, Nikhil Cotter, Laura C. Quirola-Vásquez, Jonathan A. Ravasio, Maria E. Sánchez-Sierras, Javi Torres, Manuel A. P. Jiang, Shuai-Qing Xu, Dong High Energy Astrophysical Phenomena We present James Webb Space Telescope (JWST) and Hubble Space Telescope (HST) observations of the counterpart of EP240801a, at z=1.67, the first fast X-ray transient (FXT) identified as an X-ray flash (XRF) by the Einstein Probe (EP) and Fermi-GBM. Our observations reveal strong photometric and spectroscopic evidence for an associated broad-lined Type Ic supernova (SN) SN 2024aihh, the most distant spectroscopically identified gamma ray-burst (GRB)-SN to date. The SN exhibits similar luminosity and light curve evolution to the proto-type GRB-SN 1998bw with an absolute magnitude of the SN at $\sim$23 days rest-frame of $M_{F140W} \approx$-19 mag. The SN is located in a host galaxy with complex morphology at a large ($\sim$6 kpc) offset in a region of relatively low surface brightness. The region around the SN has a modest star formation rate and is dominated by an intermediate mass-weighted age (1.4$\pm$0.3 Gyr) population, despite the apparent presence of a young, massive broad-lined Type Ic SN progenitor. These observations demonstrate that observations with HST and JWST can greatly extend the redshift range over which the GRB/FXT-SN connection can be studied, including in relatively low luminosity, X-ray rich events. They demonstrate little apparent evolution in the SN properties from local examples despite EP240801a originating from an epoch 10 Gyr ago. |
| title | JWST and HST observations of the host galaxy and supernova, SN 2024aihh in EP240801a at z=1.67 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2512.11572 |