AT 2021mhg / ZTF21abaxaqq was discovered on a ZTF r-band image on May 11, 2021 at 11:36 UT with a difference magnitude of 19.75+-0.21 mag. It was reported by the ALeRCE broker (TNS #109578) on May 14, 2021 and classified spectroscopically as a TDE at z=0.073 by ZTF on August 3, 2021 (TNS #10315). Prior to the re-brightening or second event, the last detection in the public ZTF alert stream was on September 2, 2021 with a g-band magnitude of 20.36+-0.22 mag. It had no detections in the public ZTF alert stream until 613 days later (or 727 days after discovery), on May 8, 2023 at 11:39 UT with an r-band magnitude of 18.83+-0.15 mag. Since then it has been fading, having its most recent detection on May 23, 2023 at 11:21 UT with an r-band magnitude 19.35+-0.14 mag. Its ZTF light curve can be explored in https://alerce.online/object/ZTF21abaxaqq. Forced photometry on ZTF images showed no signs of fainter events between the two main ones or prior to the first event.
AT 2021mhg / ZTF21abaxaqq is located towards SDSS J001942.89+291900.6, which has a photometric redshift of 0.116+-0.038 in SDSS DR16 (Ahumada+2020) and was classified as a galaxy in Gaia DR3 with a probability of ~0.98 (Hughes+2022).
All quoted magnitudes are difference magnitudes. We encourage additional follow-up observations of this transient.
| 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 | 2021mhg [ZTF21abaxaqq] | 00:19:42.900 | +29:19:00.70 | TDE | 0.073 | SDSS J001942.89+291900.6 | 00:19:42.900 | +29:19:00.70 | TDE | 0.073 |
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