TITLE: GCN CIRCULAR NUMBER: 44438 SUBJECT: SN 2026kid: Optical follow-up with small-aperture telescopes in Spain and China DATE: 26/05/01 13:00:52 GMT FROM: Chenxi Bao at Peking University <2300011608@stu.pku.edu.cn> Chenxi Bao (PKU), Zhuokai Liu (PKU), Yacheng Kang (PKU) report on behalf of the Interestar Collaboration and the PKU HiTF (High-energy Transients Follow-up) group: We observed the field of SN 2026kid (ZTF26aatswhm), discovered and first reported by Yasuo Sano (TNS Discovery Report 300955; T0 = 2026-04-22T14:23:47.00). Observations began on 2026 Apr 24, approximately 2.2 days after the first detection of the SN, using a 13cm optical telescope located in Yanchi, China. We subsequently employed a 28cm optical telescope located in Castillejar, Spain, to continue monitoring SN 2026kid. In total, our observations spanned 3 nights in the Luminance filter and 2 nights in the Red filter. In the Luminance- and Red-band exposures, we clearly detect the Type II SN 2026kid in the nearby edge-on spiral galaxy NGC 5907, located at a distance of 16.5 Mpc (Rehemtulla et al.,TNS AstroNote 2026-114). Our observations show that SN 2026kid has brightened since discovery, reaching approximately 16.1 mag in the Luminance band and 15.5 mag in the Red band, indicating continued early-time photometric evolution. Preliminary photometry was derived from image subtraction using pre-explosion reference images, calibrated against nearby field stars, and is reported as approximate AB-equivalent magnitudes, without correction for Galactic extinction. The observation log is summarized below: | Date | Start_UT | T_mid - T0 (days) | Filter | Exposure (s) | Magnitude (AB) | | :--------: | :------: | :---------------: | :-------: | :----------: | :------------: | | 2026-04-24 | 18:04:42 | 2.15 | Luminance | 200 | 16.22 +/- 0.02 | | 2026-04-26 | 23:00:24 | 4.40 | Luminance | 6600 | 16.11 +/- 0.04 | | 2026-04-27 | 20:11:25 | 5.25 | Luminance | 1200 | 16.16 +/- 0.26 | | 2026-04-27 | 20:46:12 | 5.29 | Red | 3600 | 15.60 +/- 0.16 | | 2026-04-29 | 20:18:58 | 7.30 | Red | 8400 | 15.42 +/- 0.22 | Further analysis and follow-up observations are ongoing. The two small-aperture telescopes are operated by the Interestar Collaboration. The PKU HiTF group is dedicated to rapid follow-up observations of high-energy transients. View this GCN Circular online at https://gcn.nasa.gov/circulars/44438. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...