ZTF21aaquyjp/AT2021hel: ZTF discovery of a hostless fast transient
Abstract
We report the discovery of the fast optical transient ZTF21aaquyjp/AT2021hel with the Zwicky Transient Facility (ZTF). ZTF data at these coordinates are public and the light curve of ZTF21aaquyjp can be retrieved using brokers such as Lasair. ZTF21aaquyjp was first detected on 2021-03-27 12:20 UT at r=17.85 +- 0.11 mag. The last ZTF upper limit before the first detection was measured on 2021-03-24 12:50 UT, which constrains the onset time to be within < 3 days. ZTF21aaquyjp is fading by ~0.5 mag/day in r-band. The transient was last observed with ZTF on 2021-03-28 12:32 UT at r=18.366 +- 0.11 mag. No underlying source or possible host galaxy is cataloged in deep Legacy Survey DR9 and Pan-STARRS archival images. Previous activity was not found in the Pan-STARRS DR2 catalog and in ATLAS images, explored via the public forced photometry server. Multi-band photometry is currently unavailable for ZTF21aaquyjp. Follow-up observations are encouraged.
- Publication:
-
Transient Name Server AstroNote
- Pub Date:
- March 2021
- Bibcode:
- 2021TNSAN.105....1A
- Keywords:
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- Optical;
- Transient;
- ZTF21aaquyjp;
- 2021hel