{
  "bibcode": "2003GCN..2220....1B",
  "body": "I.Bikmaev (KSU), I. Khamitov (TUG);\nN. Sakhibullin, V. Suleymanov (KSU);\nR. Burenin, R. Sunyaev, D. Denissenko, M. Pavlinsky, O. Terekhov, A.\nTkachenko, M.Gilfanov (IKI);\nZ. Aslan, O.Golbasi (TUG);\nU. Kiziloglu, A. Alpar, A. Baykal (METU);\n�\nreport:\n�\nWe continue observations of the GRB 030329 optical afterglow (Peterson\nand Price, GCN 1985) with the 1.5-m Russian-Turkish Telescope RTT150\nat TUG.� During the nights of May 3,4,7, 2003,� series of� 5 and 15 min\nexposures with V-filter have been obtained under good photometric\nconditions and average seeing of 1.3 arcsec.� ANDOR TE 2048 x 2048 CCD has\nbeen used as the detector.\n�\nResults of OT�our photometry (based on Henden's list, GCN 2082 ), averaged\nover for each�night,�are�as follow:\n�\n� Midtime� Vmag�� Verr Total Exp. sec\n�\n� 03.86UT� 21.40� 0.07 10200\n� 04.86UT� 21.33� 0.07 11400\n� 07.86UT� 21.60� 0.08��9300\n�\n\nAdditional note:\nProbably, a moved object was found in the vicinity of the OT. This object\nwas labeled as \"O2\" in Zharikov et al. (GCN 2171) and as \"A\" in� Blake and\nBloom (GCN 2011).\n�\nWe integrated all the three night� observations into�one image and�\nestimated the magnitudes of the sources� in the afterglow vicinity as\n��������������\n        V����� Verr\n�\nO1 (B) 23.0�� 0.2\nO2 (A) 22.6�� 0.1\n�\nUsing the coordinates of the reference stars�� from Henden's list� we have\ndetermined the positions of OT� and O1, O2 as\n�\n     RA(2000.0) DEC(2000.0)\n�\nOT 10:44:49.958 21:31:17.50\nO1 10:44:50.039 21:31:10.86\nO2 10:44:49.373 21:31:15.02\n�\nThe comparision of coordinates with those given by Blake and Bloom has\nshown that position of the source \"A\" is different by 6 arcsec while� the�\nthe�position of the source \"B\" is in agreement �within� 0.5 arcsec \npositional error of Blake and Bloom.\n�\nWe estimate the color of O2 as� V-R = 0.2,� and of O1 as V-R = 0.9\n(R mag estimates are taken from Khamitov et al., GCN 2198)\n�\nTaking into account the�apparent magnitudes, color and considerable \npositional shift, we suppose that this is�an object nearer to the Sun. \nAdditional observations are encouraged.�\n�\nThis message may be cited.",
  "circularId": 2220,
  "createdOn": 1052491805000,
  "email": "irekk@tug.tug.tubitak.gov.tr",
  "subject": "GRB030329: RTT150 optical observations",
  "submitter": "Irek Khamitov at TUG  <irekk@tug.tug.tubitak.gov.tr>",
  "eventId": "GRB 030329"
}