{
  "bibcode": "2019GCN.25798....1H",
  "body": "Y.-D. Hu, E. Fernandez-Garcia and A. J. Castro-Tirado (IAA-CSIC), D. \nHiriart and W. H. Lee (UNAM), S. Jeong and I. H. Park (SKKU) and M. D. \nCaballero-Garcia (ASU-CAS, CZ), I. Carrasco, C. Perez del Pulgar (Univ. \nde Malaga) and R. Querel (NIWA) on behalf of a larger collaboration, \nreport:\n\nThe 60cm BOOTES-5/JGT robotic telescope at Observatorio Astronomico \nNacional in San Pedro Martir (Mexico) automatically responded in 3.33 \nhrs to the INTEGRAL trigger of GRB190919B (Mereghetti et al., GCNC \n25788). A series of unfiltered images were taken (60s exposure time). \nThe optical source is detected at the position reported by Bolmer et al. \n(GCNC 25789) and Tyurina et al. (GCNC 25791) in the co-added image from \nwhich we derive a magnitude of 19.56 +/- 0.15 at median time of 4.41 h \nafter the trigger.\n\nFew hours later, the 60cm BOOTES-3/YA robotic telescope at NIWA Lauder \nin Otago (New Zealand) also automatically responded to this trigger and \ngathered a serie of unfiltered images (60s exposure time). The optical \nsource still can be detected in the co-added image with a magnitude of f \n21.2 +/- 0.4 at a median time of 9.54 hrs after trigger.\n\nThese results confirm the fading of the afterglow. The magnitude is \ncalibrated against the USNO-B1 catalog and is not corrected for Galactic \nextinction in the direction of the GRB. Further observations are \nongoing.\n\nWe thank the staff at both the Observatorio Astronomico Nacional in San \nPedro Martir and NIWA Lauder for their excellent support.",
  "circularId": 25798,
  "createdOn": 1569078272000,
  "email": "ajct@iaa.es",
  "subject": "GRB 190919B: BOOTES-5/JGT and BOOTES-3/YA optical observations",
  "submitter": "Alberto J. Castro-Tirado at IAA-CSIC  <ajct@iaa.es>",
  "eventId": "GRB 190919B"
}