We observed the nearby (10 Mpc) stripped-envelope SN2023dbc (Ho et al., AstroNote 2023-57), tentatively classified as Type Ic (Perley et al., Astronote 2023-66) with Swift/XRT beginning at 04:15 on 2023-03-22 UT, or 9d after the first ZTF detection. Visual inspection of the 4.3ks image shows no clear detection. Using the online Swift tools [1] we measure a count rate of 0.0022 [+0.0012, -0.0009] counts/sec (90% confidence interval). However, the full Swift/XRT light curve reveals pre-explosion detections with a similar count rate. Due to the history of detections and the lack of a clear source in the image, we conclude that the emission arises from the host galaxy.
We estimate an upper limit on the unabsorbed 0.3-10 keV flux (using a count rate to flux conversion factor of 4E-11) of f_X < 9E-14 ergs/cm2/s, or an upper limit on the luminosity of L_X < 1E39 erg/s at 10.25 Mpc.
We thank the Swift staff for rapidly approving and scheduling our observations.
[1] Evans et al. (2009), MNRAS, 397, 1177
| 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 | 2023dbc | 11:11:39.211 | +55:40:29.23 | SN Ic | 0.0023 | 11:11:39.230 | +55:40:28.99 | SN Ic | 0.0023 |
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