{
  "subject": "Correction to 31937: GRB 220421B: Detection by VZLUSAT-2",
  "eventId": "GRB 220421B",
  "bibcode": "2022GCN.31949....1R",
  "createdOn": 1650905538000,
  "circularId": 31949,
  "submitter": "Jakub Ripa at Masaryk University  <ripa.jakub@mail.muni.cz>",
  "email": "ripa.jakub@mail.muni.cz",
  "body": "J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), M. Ohno (Eotvos \nU./Hiroshima U.),�� N. Werner�� (Masaryk U.),�� L. Meszaros (Konkoly \nObservatory), H. Takahashi (Hiroshima U.), B. Csak (Konkoly \nObservatory), M. Topinka, F. Munz, F. Hroch (Masaryk U.), J. Hudec, J. \nKapus, M. Frajt, M. Rezenov (Spacemanic s.r.o), R. Laszlo (Needronix), \nG. Galgoczi (Wigner Research Center/Eotvos U.), N. Uchida (ISAS/JAXA), \nT. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), Y. Fukazawa, K. Hirose, H. \nMatake (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), \nL. L. Kiss (Konkoly Observatory),�� T. Mizuno (Hiroshima U.), K. Nakazawa \n(Nagoya U.), H. Odaka (Univ of Tokyo), K. Torigoe (Hiroshima U.), P. \nSvoboda, V. Daniel, J. Dudas, M. Junas, J. Gromes (VZLU), I. Vertat (FEL \nZCU)�� -- the VZLUSAT-2/GRB payload collaboration.\n\nIn Ripa et al. GCN 31937 we reported a detection of the GRB 220421B. \nBased on the GOES-16 and GOES-17 X-ray data the reported burst is \nprobably not a GRB but a solar flare. The GOES X-ray light curves show a \npeak at 2022-04-21 21:04:00 UT which coincides with the peak in the rate \ncurves from the GRB detectors on board the VZLUSAT-2 nanosatellite. The \nSun was in the field of view of the VZLUSAT-2/GRB detectors.\n\nWe apologize for any inconvenience."
}