{
  "bibcode": "2008GCN..7206....1B",
  "body": "I. Bikmaev, A. Galeev, N. Sakhibullin (KSU/AST)\nR. Burenin, M. Pavlinsky, R. Sunyaev (IKI),\nI. Khamitov, Z. Eker (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.)\n\nreport:\n\nThe optical counterpart to X-ray transient in NGC 2770, SN2008D (GCN\nRep. 110.1, GCN Circ. 7160, 7161) was observed also with Russian-Turkish\n1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National Observatory, Turkey)\nduring the first two nights after the XRF.\n\nSeries of BVRI direct images and low resolution spectra (during the second\nnight) were taken.\n\nThe object shows no variability during the few hours of observations in\nevery nignt at the level >~ 0.05m, but we detect the decline of the OT in\nall filters betwen two nights. Assuming R=17.3 and B=17.7 magnitudes for\nUSNO-A2.0 1200-06240802 star (as it was done in GCN's 7162 and 7187), we\nestimate the following magnitudes for the transient:\n\nTime, UT    t-t0,days   mag\n\nJan 11.03   0.46        R = 18.06\nJan 11.14   0.57        B = 18.72     \nJan 12.11   1.55        R = 18.15   \nJan 12.12   1.55        B = 18.98\n\nHowever, these measurements are preliminary, more accurate subtraction of\nthe galaxy is to be done.\n\nA low resolution spectrum was obtained, using TFOSC spectrometer. We take\n3x1200s exposures, centered at Jan 12.00 UT. The spectrum has resolution\nabout 15~A, covering 3900 to 9000~A. Strong H_alpha and other narrow\nemission lines are detected in the galaxy near the object, so that it was\ndifficult to correctly subtract background near these lines. Hovewer, we\nbelieve, that the overall shape of our spectrum is correct. We definitely\nsee much less amount of supernova signatures as compared to Blondin et\nal. (GCN 7173), in agreement with Soderberg et al. (GCN 7165) and\nThorstensen (ATEL #1358).\n\nThe finding chart and the plot of our spectrum can be found at:\n\nhttp://hea.iki.rssi.ru/grb/080110-SN2008D/indexeng.html",
  "circularId": 7206,
  "createdOn": 1201100126000,
  "email": "rodion@hea.iki.rssi.ru",
  "subject": "X-ray transient in NGC 2770: RTT150 optical observations",
  "submitter": "Rodion Burenin at IKI, Moscow  <rodion@hea.iki.rssi.ru>"
}