We report the discovery ZTF20abpgnos / AT2020qna, a young rising transient reported by the ALeRCE broker (TNS #78910) using the ZTF public alert stream. The object was detected on ZTF r-band images obtained on July 29, 2020 at 07:47 UT, ~2 days after its last non-detection. It was also detected on ZTF g-band images obtained on July 29, 2020 at 09:29 UT, ~3 days after its last non-detection. Since then, the object has been rising at 2.1 mag/day in r-band and 1.6 mag/day in g-band, reaching 17.3 mag in r-band on July, 30 2020 at 06:30 UT and 17.2 mag in g-band on July, 30 2020 at 08:36 UT. Its light curve can be explored in https://alerce.online/object/ZTF20abpgnos.
The Galactic extinction for this source is 0.925 mag in the r-band and 1.276 mag in the g-band. We found no reliable counterparts in public multi-wavelength catalogs closer than 10 arcseconds. ZTF20abpgnos lies at the tip of the Cygnus Loop, a known SNR located at 540_{-80}^{+100} pc (Blair et al. 2005), middle-aged (∼14,000 yr; e.g., Levenson et al.1998), which is considered to be a remnant of a core-collapse supernova explosion within a preexisting cavity (Levensonet al.1997). There is an XMM-Newton detection at ~6 arcseconds, J204824.7+294501, from the XMM-Newton Serendipitous Source Catalogue 3XMM-DR8. Its date of last observation was on May 10, 2012, and was labeled as "possibly spurious" in the Xcat-DB.
Swift observations have been requested, and 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 | 2020qna [ZTF20abpgnos] | 20:48:25.181 | +29:45:04.83 | 20:48:25.181 | +29:45:04.83 |
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