{
  "bibcode": "2020GCN.27218....1S",
  "body": "T. Sakamoto (AGU), E. Troja (NASA/GSFC/ORAU), J. Norris (BSU),\nS. D. Barthelmy (GSFC), J. L. Racusin (GSFC), N. Kawai (Tokyo Tech),\nA. Fruchter (STScI), M. Im (SNU)\n\nA Chandra ToO observation of GRB 200219A (Lien et al., GCN Circ. 27125;\nBissaldi et al., GCN Circ. 27137) started on February 23 16:32 UT (~4.4 days\nafter the GRB trigger) for a total of 19.2 ksec.\n\nWe do not detect an X-ray afterglow at the location of the enhanced XRT position\n(Osborne et al., GCN Circ. 27138).  The calculated 3-sigma upper limit is 3.3e-4 c/s\nin the 0.35-8 keV band using aprates of the CIAO software package.\nUsing the best fit spectral parameters of the XRT PC mode data, we estimated\nan 3-sigma unabsorbed flux upper limit of 5.0e-15 erg/cm2/s in the 0.35-8 keV band.\n\nWe would like to thank the Chandra operation team for rapidly approving and\nmaking this observation.",
  "circularId": 27218,
  "createdOn": 1582698721000,
  "email": "tsakamoto@phys.aoyama.ac.jp",
  "subject": "GRB 200219A: Chandra rapid ToO upper limit",
  "submitter": "Takanori Sakamoto at AGU  <tsakamoto@phys.aoyama.ac.jp>",
  "eventId": "GRB 200219A"
}