We observed the Fast, Blue, and Luminous Optical Transient 2025ngt (ZTF25aaurzyo, Camilo et al., AstroNote 2025-190) and later classified it as a SN Type Ic-BL (Perley et al., AstroNote 2025-193) with Swift on June 24, 2025, ~12d after the discovery.
We do not detect any X-ray emission at the position of the transient with a 3sigma upper limit of 4.25E-03 cts/s in a 3532 s exposure. At a distance of 450 Mpc, this turns out to limit the 0.3-10 keV unabsorbed luminosity to L<3x1042 erg s-1 (for a Gamma=2 power-law spectrum, absorbed at the Galactic NH=6x1020 cm-2).
AT2025ngt is detected in all the UVOT filters with (AB) magnitudes of:
V= 18.63 +/- 0.21 (183.4 s)
B= 19.16 +/- 0.18 (183.4 s)
U= 19.87 +/- 0.17 (183.4 s)
W1= 20.73 +/- 0.18 (551.4 s)
M2= 21.14 +/- 0.15 (1379.2 s)
W2= 21.28 +/- 0.16 (918.6 s)
| 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 | 2025ngt [ZTF25aaurzyo] | 19:09:04.262 | +47:52:47.04 | SN Ic-BL | 0.0972 | WISEA J190904.33+475245.5 | 19:09:04.262 | +47:52:47.04 | SN Ic-BL | 0.0972 |
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