{
  "bibcode": "2020GCN.27567....1S",
  "body": "B. Stecklum, S. Klose, S. Melnikov, and A. Nicuesa Guelbenzu (all \nTautenburg) report:\n\nWe observed the field of GRB 200412B (Fermi GBM team, GCN 27547; Mailyan \net al., GCN 27558; see also Burgess et al., GCN 27548; Longo et al., GCN \n27557; Page et al., GCN 27561; Gupta et al., GCN 27563; Zheng et al., GCN \n27565) with the Tautenburg 1.34m Schmidt telescope equipped with the \nTAUKAM 6k x 6k CCD camera and the wide V-band filter (VB). The \ntransmission curve of this filter closely follows the Gaia GBP filter.\n\nThe fading optical transient detected by MASTER Global Robotic Net \n(Lipunov et al., GCN 27555, 27556) is clearly detected on our images (for \nother optical observations see also Kumar et al., GCN 27564; Belkin et \nal., GCN 27566). Using Gaia DR2 stars in the field, we measure the \nfollowing preliminary magnitudes (Vega system):\n\nMean time: April 12, 21:29:48 UT, VB = 18.43 +/- 0.01\nMean time: April 13, 02:22:38 UT, VB = 19.00 +/- 0.01",
  "circularId": 27567,
  "createdOn": 1586780767000,
  "email": "klose@tls-tautenburg.de",
  "subject": "GRB 200412B: Tautenburg observations",
  "submitter": "Sylvio Klose at TLS Tautenburg  <klose@tls-tautenburg.de>",
  "eventId": "GRB 200412B"
}