{
  "bibcode": "2020GCN.27400....1O",
  "body": "S. R. Oates (U. of Birmingham),  N. J. Klingler (PSU), K. L. Page (U.Leicester), A. A. Breeveld (MSSL-UCL),\nP. Brown (TAMU), M. De Pasquale (Istanbul U.), C. Gronwall (PSU), N. P. M. Kuin (UCL-MSSL),\nF. E. Marshall (NASA/GSFC), M. J. Page (UCL-MSSL),  M. H. Siegel (PSU), A. D'Ai (INAF-IASFPA),\nP. D'Avanzo (INAF-OAB), S. D. Barthelmy (NASA/GSFC), A. P. Beardmore (U. Leicester),\nD. N. Burrows (PSU), S. Campana (INAF-OAB), S. B. Cenko (NASA/GSFC), G. Cusumano (INAF-IASF PA),\nV. D'Elia (ASDC), P. A. Evans (U. Leicester),P. Giommi (ASI), D. Hartmann (Clemson U.),\nJ. A. Kennea (PSU),  H. A. Krimm (NSF), A. Y. Lien (GSFC/UMBC), D. B. Malesani (DTU Space),\nA. Melandri (INAF-OAB), J. A. Nousek (PSU), P. T. O'Brien (U. Leicester), J. P. Osborne (U. Leicester),\nC. Pagani (U. Leicester),   D. M. Palmer (LANL), M. Perri (ASDC), J. L. Racusin (NASA/GSFC), \nT. Sakamoto (AGU), B. Sbarufatti (INAF-OAB/PSU), G. Tagliaferri (INAF-OAB), A. Tohuvavohu (U Toronto), \nand E. Troja (NASA/GSFC/UMCP) report on behalf of the Swift team:\n\nWe report continued Swift/UVOT and XRT observations of ZTF20aamvmzj (AT2020cja; Kasliwal et al.,\nGCN Circ. 27051) found by Zwicky Transient Facility during the search for the EM counterpart\nof the LVC event S200213t (LIGO/VIRGO Collaboration GCN Circ. 27042). This object was also\nobserved by Lulin (Li et al., GCN Circ. 27082) and spectroscopically by DBSP (Ho et al., GCN Circ. 27074). \nThe Swift/UVOT detection was reported in Oates et al., (GCN Circ. 27153).\n\nSwift/UVOT and XRT has monitored this source from 6.7 days until 29 days after the LIGO/VIRGO trigger\n(LIGO/VIRGO Collaboration GCN Circ. 27042). During this time the source was observed to decay and we\nno longer detect the source in any filter. In the following we give preliminary 3 sigma upper limits,\ncombining images from the last two observations, using the UVOT photometric system (Breeveld et al. \n2011, AIP Conf. Proc. 1358, 373):\n\nFilter   T_start(s)   T_stop(s) Exp(s)     3sigUL\n\nv        1714547      2505112    428        > 19.8\nb     \t 1713986      2504817\t 428        > 20.7\nu     \t 1713871      2504756\t 428        > 20.2\nw1     1713647      2504694\t 857        > 20.2\nm2     1714661      2505297\t 1238       > 20.5\nw2     1714102      2505050    1717       > 20.8\n\nThe magnitudes in the table are not corrected for the Galactic extinction due to the\nsignificant reddening of E(B-V) = 0.23 in the direction of the burst (Schlegel et al. 1998).\n\nCombining all 14.4 ks of XRT data collected to date, no source is detected down to a count rate\nof 6.7x10^-4 count s^-1. This corresponds to a 3-sigma upper limit of 2.9x10^-14 erg cm^-2 s^-1,\nassuming a standard power-law spectrum with NH=3x10^20 cm^-2, and photon index (Gamma)=1.7.\n\nThis circular is an official product of the Swift team.",
  "circularId": 27400,
  "createdOn": 1584453241000,
  "email": "samantha.oates@alumni.ucl.ac.uk",
  "subject": "LIGO/Virgo S200213t: Continued Swift UVOT and XRT observations of ZTF20aamvmzj (AT2020cja)",
  "submitter": "Samantha Oates at MSSL  <samantha.oates@alumni.ucl.ac.uk>",
  "eventId": "LIGO/Virgo S200213t"
}