{
  "bibcode": "2025GCN.40289....1E",
  "circularId": 40289,
  "body": "D. Eappachen (IIA), V. Swain (IITB), A. Salgundi (IITB), D.K. Sahu (IIA), A.P. Saikia (IITB), G. C. Anupama (IIA), V. Bhalerao (IITB), A. Balasubramanian (IIA),  S. Barway (IIA), S. Bandari (IAO):\n\nWe observed the field of EP250427a (Wang et al., GCN #40257), also detected by Fermi-GBM (Ravasio et al., GCN #40262) with the 2.0m Himalayan Chandra Telescope (HCT) of the Indian Astronomical Observatory (IAO). We obtained multiple exposures in the SDSS \nr' filter starting at 2025-04-29 22:10:49.88 UT (~2.77 days post trigger). We detected the source in our stacked image and obtained the following photometric result:\n\n\n| JD (mid)    | Filter | Exposure (s) | Mag (AB) | Limiting Magnitude (AB) |\n| ----------------- | ------- | ------------------ | -------------- |--------------|\n|  2460795.433742  |   r'   |   5 x 240       |  21.70 +/- 0.12 | 21.9 |\n\n\nThe magnitudes are calibrated against PanSTARRS DR1 (Chambers et al., 2016) and not corrected for Galactic extinction.\n\nOur result is consistent with BOOTES-7 (Perez-Garcia et al., GCN #40259), TRT (Liu et al., GCN #40260), COLIBRÍ (Becerra et al., GCN #40261), REM (Brivio et al., GCN #40264), LCO (Pérez-Fournon et al., GCN #40267), LT (Qiang Xi et al., GCN #40269), GIT (Swain et al., GCN #40270), COLIBRÍ (Magnani et al., GCN #40271), Lesedi (S. de Wet et al., GCN #40272), FTW (Busmann et al., GCN #40273), OHP/T193 (Amram et al., GCN #40275).\n\nThese observations were carried out under the ToO program HCT-2025-C1-P08. We thank the HCT staff for their support during the observations. The Indian Astronomical Observatory is operated by the Indian Institute of Astrophysics, Bengaluru, India.",
  "eventId": "EP250427a",
  "subject": "EP250427a/GRB250427A: HCT optical follow-up",
  "submittedHow": "web",
  "format": "text/markdown",
  "createdOn": 1746017753549,
  "submitter": "anirudhsalgundi@gmail.com"
}