{
  "bibcode": "2017GCN.21931....1B",
  "body": "T. Batsch, A.J. Castro-Tirado, H. Czyrkowski, A. �wiek, M. �wiok,\nR. D�browski, M. Jel�nek, G. Kasprowicz, A.Majcher, K. Ma�ek,\nL. Mankiewicz, K. Nawrocki, �. Obara, R. Opiela, L. W. Piotrowski,\nM. Siudek, M. Soko�owski, R. Wawrzaszek, G. Wrochna, A. Zadro�ny,\nM. Zaremba, A.F. �arnecki (Pi of the Sky Collaboration)\n\nPi of the Sky robotic wide field of view telescopes search for the\npossible EM transients in the sky scans performed twice a night. Each\nof the two observation sites (South telescope in Chile and the North\none in Spain) can cover up to about 20000 sq. deg. with range up to\nabout 12.5m. Dedicated algorithms search for brightness changes of\nobjects listed in GLADE to detect optical transients that might be\nconnected with those galaxies.\n\nIn the analysis related to G29048 we considered data collected by Pi\nof the Sky North telescope located in Spain, near Huelva, between\nAugust 17 and August 21, while the earlier data collected between\nAugust 10 and August 16 were used as a reference. The observations\nwere performed in wide visible band, with IR-cut and UV-cut filters\nonly, to achieve deepest detection limit. For each scan field 10\nimages with 10s exposure were taken and stacked for the analysis. On\nthe night of 20170817 we surveyed area that overlaped partially with \nthe initial bayesstar skymap for G298048. Unfortunatly, the dedicated \nscan procedure was interupted twice that night by the GCN alerts, \nresulting in the event coverage reduced to only about 29% probability, \neven after including other data collected that night. Coverage of \nabout 51% was expected for uninterupted scan procedure, as \nobtained on the following nights. Data was searched for any type of \ntransients connected with objects from GLADE catalogue. No \nsignificant transient candidate remained after all selection cuts.\n\nWe acknowledge hospitality and support of the INTA El Arenosillo \nTest Centre in Mazag�n near Huelva, Spain.\n\n\nFields covered with the sky scan procedure on 20170817\n------------------------------------------------------\n\nPointing (RA[deg],Dec[deg]) gives the center of 20x20 deg^2 FOV.\n\nField name     Pointing\nS0120_10_10   ( 10.8, -0.2)\nS0000+50_35   ( 16.9, 57.1)\nS0200+50_10   ( 17.7, 39.5)\nS0120_10_35   ( 29.4, 18.1)\nS0200+50_35   ( 47.0, 57.1)\nS0000+90_35   ( 61.0, 77.4)\nS1600+50_35   (227.7, 40.7)\nS1600+10_10   (230.2,  0.1)\nS0000+90_10   (244.6, 76.8)\nS1600+10_35   (249.2, 18.0)\nS1600+50_10   (257.5, 58.5)\nS1840+10_10   (270.4,  0.0)\nS2000+50_10   (287.8, 39.5)\nS1840+10_35   (289.3, 18.0)\nS2120+10_10   (310.6, -0.1)\nS2000+50_35   (317.1, 56.9)\nS2299+50_10   (317.6, 39.5)\nS2120+10_35   (329.4, 18.1)\nS2240+10_10   (330.5, -0.1)\nS2299+50_35   (347.0, 57.3)\nS0000+50_10   (348.0, 39.4)\nS2240+10_35   (349.5, 18.2)\n\nFields covered with other sky observations on 20170817\n------------------------------------------------------\n\nGRB170817_35  ( 39.2, 79.9),\nGRB170817_10  (250.2, 73.4),\nGRB170818_35  (312.4, 10.7),\n\nS0000-10_35   (  9.0, -1.9),\nR0000+30_10   ( 11.3, 39.0),\nS0200+50_10   ( 17.7, 39.4),\nS0326+70_10   ( 33.0, 58.8),\nS0326+70_10   ( 33.2, 58.8),\nS0200+50_35   ( 47.0, 57.1),\nS0326+70_35   ( 89.9, 75.9),\nS1440+10_10   (210.2,  0.3),\nS1440+10_35   (229.0, 18.2),\nS1630+30_10   (236.9, 20.1),\nS1630+30_35   (258.5, 38.0),\nS2000-10_10   (289.8,-19.8),\nS2000-10_35   (308.7, -1.7),\nS2120-10_10   (309.8,-19.7),\nS2200+50_10   (317.4, 39.4),\nS2120-10_35   (328.9, -1.8),\nS2240+10_10   (330.4, -0.2),\nR0000+30_35   (349.6, 21.0),\nS2200+50_35   (346.7, 57.2),\nS2240+10_35   (349.3, 18.2),\nS0000-10_10   (350.0,-19.8),\n\nThis message can be cited.",
  "circularId": 21931,
  "createdOn": 1506460669000,
  "email": "grb@fuw.edu.pl",
  "subject": "LIGO/Virgo G298048: Summary of Pi of the Sky observations",
  "submitter": "Adam Zadrozny at Pi of the Sky  <grb@fuw.edu.pl>",
  "eventId": "LIGO/Virgo G298048"
}