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Outburst detection by "Pi of the Sky"

ATel #3781; M. Sokolowski, T. Batsch, A. Majcher, A. Majczyna, K. Nawrocki, J. Uzycki, G. Wrochna (NCNR, Swierk),M. Cwiok, L. W.Piotrowski, A. F.Zarnecki (University of Warsaw),K. Malek, L. Mankiewicz, R. Opiela, M. Siudek, V. Repei (CFT PAN),G. Kasprowicz, M. Zaremba (Warsaw University of Technology),from the "Pi of the Sky" collaboration ( http://grb. fuw. edu. pl ).M. Jelinek, P. Kubanek, J. C.Tello and A. J.Castro-Tirado (IAA-CSIC Granada) on behalf of a larger collaboration.
on 26 Nov 2011; 13:15 UT
Credential Certification: Marcin Sokolowski (msok@fuw.edu.pl)

Subjects: Optical, Transient, Variables

The wide field "Pi of the Sky North" apparatus installed in the BOOTES-1 station at ESAt/INTA-CEDEA in Mazagon (Huelva, Spain; http://grb.fuw.edu.pl/pi/index.html#piinta_site.htm ) identified an outburst within its field of view at 23:28:38 UT on November 24, 2011. New source was visible at position (J2000): RA 04h13m27.15s , DEC -01 deg 39 min 29 sec and the magnitude measured from the 10s unfiltered exposures was: Mag Start time (10s exposure) 12.02 23:28:26 11.80 23:28:38 12.01 23:28:51 11.89 23:29:04 12.24 23:29:16 12.28 23:29:29 where magnitude is based on the reference star magnitude in V filter. No object was visible at this position at earlier times. The limit from 20 coadded frames was 12.5 mag. The measured position coincides within estimated position error of about 10 arcsec with 2MASS J04132663-0139211 star: http://simbad.u-strasbg.fr/simbad/sim-id?Ident=J04132663-0139211&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id

Images of the optical transient