Transient astronomical events that exhibit no evident association with a host galaxy are rare phenomena associated with extremely energetic events. They can offer unique insights into the properties and evolution of stars and galaxies. In this context, we developed the ELEPHANT pipeline (Pessi et al. 2024) to process alerts from the Zwicky Transient Facility (ZTF; Bellm et al. 2019; Graham et al. 2019) ingested by the Fink broker (Möller et al. 2021) and automatically find hostless candidates.
This report includes recent hostless candidates, sumarized below. We encourage classification and follow up of these targets.
These candidates were found through a dedicated Telegram bot, publicly available at https://t.me/fink_hostless . This is part of a series of public bots made available by Fink. The full list can be found here.
| Catalog | Name | Reported RA | Reported DEC | Reported Obj-Type | Reported Redshift | Host Name | Host Redshift | Remarks | TNS RA | TNS DEC | TNS Obj-Type | TNS Redshift |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TNS | 2025gyv [ZTF25aalsbpm] | 10:38:24.082 | +68:02:25.02 | Supernova candidate. Rising very slowly. Reported as a SLSN candidate by NEEDLE (AstroNote 2025-132, Sheng et al., 2025) | 10:38:24.082 | +68:02:25.02 | ||||||
| TNS | 2025ism [ZTF25aaoqzhl] | 16:50:31.813 | +59:12:24.93 | Supernova candidate. Rising. | 16:50:31.813 | +59:12:24.93 | ||||||
| TNS | 2025hjx [ZTF25aalzmdh] | 17:04:31.407 | +54:01:46.40 | Supernova candidate. Possibly around or past peak. Reported as a SLSN candidate by NEEDLE (AstroNote 2025-132, Sheng et al., 2025) | 17:04:31.407 | +54:01:46.40 | ||||||
| TNS | 2025isa [ZTF25aanxvlg] | 16:22:19.086 | +15:47:56.40 | Supernova candidate. Rising. Originally flagged as a possible SN Ia by Peloton et al., 2025. | 16:22:19.086 | +15:47:56.40 | ||||||
| TNS | 2025imp [ZTF25aaompnz] | 15:02:34.229 | +34:53:02.25 | Supernova candidate. Possibly declining after a sharp peak. | 15:02:34.229 | +34:53:02.25 | SN Ibn | 0.06 |
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