ZTF24abjjpbo (AT2024wpp) was first detected before its initial discovery by the Zwicky Transient Facility (ZTF) in difference imaged-forced photometry on MJD 60578.43651 (2024-09-25 10:28:34) at g=20.78 +/- 0.27 mag (Astro Note 2024-272), and was flagged as a transient of interest the next night due to its rapid rise (3 magnitudes), blue colors (g - r = 0.4 mag), and proximity to a nearby galaxy (photo-z of 0.11 +/- 0.05, 68% confidence, Zhou et al. 2023). We obtained a 3.5 ks Swift ToO observation on MJD 60580.40419, and tentatively identified a source consistent with the optical transient position (Astro Note 2024-272). However, a cosmic ray in the image produced a hot line that passed through the source position, making the X-ray detection uncertain without further follow-up observations.
We obtained another 2.2 ks Swift ToO one day later on MJD 60581.78524. The source was detected again, confirming the previous X-ray detection of AT 2024wpp. After applying a weighted correction factor, the source count rate was derived as 0.025 counts/second. Through the XRT spectral analysis online tool, we derive a photon index of 1.69 (+0.42, -0.29), and an unabsorbed counts to flux conversion of 3.98e-11 erg/cm^2/s/ct, which corresponds to a flux of ~ 1e-12 erg/s/cm^2.
We encourage additional multiwavelength follow-up observations.
| 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 | 2024wpp [ZTF24abjjpbo] | 02:42:05.499 | -16:57:22.90 | 02:42:05.499 | -16:57:22.90 | SN |
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