DRAFT
2023-08-14 18:05:19
Type: Object/s-Data/Analysis
Bibcode: 2023TNSAN.225....1P
Pre-rise activity in the candidate supernova AT 2023mtp (ZTF23aalftvv, ATLAS23qbj)
Authors: I. Pérez-Fournon and F. Poidevin (IAC and ULL)
Source Group: SGLF
Keywords: Photometry, Transient, Supernova, Optical
Abstract:
Here we report pre-rise activity in the candidate supernova AT 2023mtp (ZTF23aalftvv, ATLAS23qbj), that is likely associated with a low-surface-brightness galaxy. AT 2023mtp was discovered by ZTF on 2023-05-14 09:48:49 and independently detected by ATLAS on 2023-08-02 08:33:16. The ZTF photometry shows a fast brightening from 2023-07-31 05:23:19 (ZTF g = 18.428 ± 0.080) to 2023-08-07 09:53:12 (ZTF peak r magnitude = 16.789 ± 0.048). Spectroscopic classification and further follow up is strongly encouraged.

AT 2023 was discovered by ZTF on 2023-05-14 09:48:49 (MJD = 60078.40890) and independently detected by ATLAS on 2023-08-02 08:33:16 (MJD =  60158.35643). The ZTF light curve shows a slow flux rise until 2023-07-26 08:20:06 (MJD = 60151.34729, ZTF g = 20.420 ± 0.215) and a fast brightening from 2023-07-31 05:23:19 (MJD = 60156.22452, ZTF g = 18.428 ± 0.080) to
2023-08-07 09:53:12 (MJD = 60163.41195; ZTF peak r magnitude = 16.789 ± 0.048).
The likely host is a low-surface-brightness galaxy at RA, Dec (deg) = 258.5400, 81.0754 with DESI Legacy Survey DR10 magnitudes g=21.09, r=20.64, z=20.45 and uncertain photometric redshift
z = 0.065 +/- 0.034. Spectroscopic classification and further follow up is strongly encouraged.

The ZTF light curve is available at the ZTF/LSST brokers, e.g.

https://lasair-ztf.lsst.ac.uk/objects/ZTF23aalftvv/

https://alerce.online/object/ZTF23aalftvv

https://antares.noirlab.edu/loci/ANT2023ll6tiz99djff

https://fink-portal.org/ZTF23aalftvv

ATLAS forced photometry is provided in the attached related file.

DESI Legacy Surveys DR10 finding chart:

https://www.legacysurvey.org/viewer?ra=258.53557803125&dec=81.07485245000001&zoom=14&mark=258.53557803125,81.07485245000001&layer-dr10

 

 

Show current TNS values
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 2023mtp [ZTF23aalftvv] 17:14:08.537 +81:04:29.40 17:14:08.556 +81:04:29.41 SN II 0.034
File Comments
2023mtp_atlas_light_curve_14aug2023.pdf ATLAS forced photometry.

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