We report the detection of a new transient in a second epoch of JWST NIRCam observations of Abell 2744 by the DDT program 2756 (PI: Wenlei Chen). This transient was detected in multiple NIRCam filters at RA=0:14:19.5675, DEC=-30:23:52.317 in the new imaging acquired on December 6, 2022 (UT). The new event is located in the same gravitationally lensed arc where AT2022acfv (AstroNote 2022-257) was detected in DDT imaging taken on October 20, 2022. These two events are separated by 1.72 arcseconds, and the arc has a photometric redshift of z=2.7 (Castellano et al. 2016). The predicted time delay between the position of this event and that of AT2022acfv is smaller than 2 days, according to the published GLAFIC v4, Keeton v4, and Sharon v4 HFF lens models (https://archive.stsci.edu/prepds/frontier/lensmodels). Since this expected delay is much less than the separation in time between the pair of DDT observations (47 days), the newly discovered transient is unlikely to be a delayed arrival of AT2022acfv.
Photometry of the transient (AB magnitudes):
(12/06/2022 UT): F115W=30.10(0.56), F150W=29.64(0.23), F200W=28.86(0.18), F277W=28.99(0.19), F356W=29.17(0.23), F444W=29.35(0.59).
| 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 | 2022acfv | 00:14:19.567 | -30:23:52.32 | 2.7 | 2.7 | 00:14:19.567 | -30:23:52.32 | 2.7 |
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