We present the photometric evolution of the Type Ia SN 2025rbs over the first 40 days, based on measurements obtained by the Observadores de Supernovas group (ObSN, Spain). The light curves begin a few hours after its discovery by GOTO (https://ui.adsabs.harvard.edu/search/q=2025TNSTR2688....1O) on July 17th.
For this study, we used numerous telescopes located in private observatories throughout Spain and Italy. These observatories are equipped with CCD and CMOS detectors with Johnson/Cousin BVRI and Sloan g', r', i' filters. The rapid initial increase in brightness of the supernova was clearly detected, as well as a slower rise near the maximum. The maximum calculated from our observations occurred at HJD 2460886.61051 in the V band, and slightly earlier, as usual, in the B band (HJD 2460885.39671). The decline in brightness has also been documented in all bands, as well as the secondary maximum in the near-infrared (especially in the R, I J/C, and Sloan i' filters).
Further information and observations can be obtained and/or requested through the ObSN website (www.obsn.es) or by email at observadoresdesupernovas@gmail.com.
| 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 | 2025rbs | 22:37:03.642 | +34:25:07.96 | SN Ia | 0.002722 | 22:37:03.638 | +34:25:07.98 | SN Ia | 0.002722 |
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