AstroNote 2020-148

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DRAFT
2020-07-31 01:01:36
Type: Object/s-Discovery/Classification
Discovery of young rising transient ZTF20abpgnos / AT2020qna
Authors: A. Munoz Arancibia (MAS), L. Hernandez-Garcia (MAS), M. Catelan (UC/MAS), P. Sanchez-Saez (MAS/UC/UAI), E. Camacho (UC/MAS), C. Valenzuela (MAS), F. Forster (CMM/MAS), F.E. Bauer (UC/MAS), G. Pignata (UNAB/MAS) on behalf of the ALeRCE broker
Source Group: ZTF
Keywords: Transient
Abstract:
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. 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. The light curve can be explored in https://alerce.online/object/ZTF20abpgnos. Swift observations have been requested, and we encourage additional follow-up observations of this transient.

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.

Show current TNS values
CatalogNameReported RAReported DECReported Obj-TypeReported RedshiftHost NameHost RedshiftRemarksTNS RATNS DECTNS Obj-TypeTNS Redshift
TNS2020qna [ZTF20abpgnos]20:48:25.181+29:45:04.8320:48:25.181+29:45:04.83