{
  "body": "H. Negoro (Nihon U.), M. Serino, Y. Kawakubo (AGU), W. Iwakiri (Chiba U.),\nM. Nakajima, Y. Kudo, H. Shibui, K. Takagi, H. Takahashi, K. Tatano, H. Nishio (Nihon U.), \nT. Mihara, T. Kawamuro, S. Yamada, S. Wang, T. Tamagawa, N. Kawai, M. Matsuoka (RIKEN), \nT. Sakamoto, S. Sugita, H. Hiramatsu, H. Nishikawa, Y. Kondo, S. Sasao, A. Yoshida (AGU), \nY. Tsuboi, H. Sugai, N. Nagashima (Chuo U.), M. Shidatsu, Y. Niida (Ehime U.),\nI. Takahashi, M. Niwano, N. Higuchi, Y. Yatsu (Tokyo Tech), S. Nakahira, S. Ueno, H. Tomida,\n M. Ishikawa, S. Ogawa, M. Kurihara (JAXA), Y. Ueda, Y. Okada, K. Fujiwara (Kyoto U.),  \nM. Yamauchi, Y. Otsuki, T. Hasegawa, M. Nishio (Miyazaki U.), K. Yamaoka (Nagoya U.), \nand M. Sugizaki (Kanazawa U.)\n\nThe MAXI/GSC nova alert system triggered on a bright uncatalogued X-ray transient source \nat 12:56:30 UT on 2024 December 13. Assuming that the source flux was constant over the transit,\nwe obtain the source position at\n(R.A., Dec) = (331.450 deg, 4.282 deg) = (22 05 48, +04 16 55) (J2000) \nwith a statistical 90% C.L. elliptical error region \nwith long and short radii of 0.16 deg and 0.15 deg, respectively. \nThe roll angle of the long axis from the north direction is 141.0 deg counterclockwise. \nThere is an additional systematic uncertainty of 0.1 deg (90% containment radius).\nThe X-ray flux averaged over the scan was 465 +- 58 mCrab\n(4.0-10.0keV, 1 sigma error).\nWithout assumptions on the source constancy, we obtain a rectangular error\nbox for the transient source with the following corners:\n(R.A., Dec) = (331.162, 4.788) deg = (22 04 38, +04 47 16) (J2000)\n(R.A., Dec) = (330.936, 4.585) deg = (22 03 44, +04 35 05) (J2000)\n(R.A., Dec) = (331.900, 3.518) deg = (22 07 35, +03 31 04) (J2000)\n(R.A., Dec) = (332.126, 3.721) deg = (22 08 30, +03 43 15) (J2000)\nThere was no significant excess flux in the previous transit at 11:23 UT \nwith an upper limit of 20 mCrab.",
  "eventId": "GRB 241213B",
  "bibcode": "2024GCN.38555....1N",
  "circularId": 38555,
  "subject": "GRB 241213B: MAXI/GSC detection",
  "submittedHow": "web",
  "submitter": "Hitoshi Negoro at Nihon University/MAXI team <negoro.hitoshi@nihon-u.ac.jp>",
  "createdOn": 1734096639585,
  "format": "text/plain"
}