Gamma-ray Burst 150110A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN Circular #17290
  H. Negoro (Nihon U.), S. Nakahira, S. Ueno, H. Tomida, M. Kimura, M. Ishikawa, Y. E. Nakagawa (JAXA), T. Mihara, M. Sugizaki, M. Serino, M. Morii, J. Sugimoto, T. Takagi, A. Yoshikawa, M. Matsuoka (RIKEN), N. Kawai, Y. Tachibana, T. Yoshii (Tokyo Tech), A. Yoshida, T. Sakamoto, Y. Kawakubo, H. Ohtsuki (AGU), H. Tsunemi, D. Uchida (Osaka U.), M. Nakajima, K. Fukushima, T. Onodera, K. Suzuki, M. Fujita, F. Honda, T. Namba (Nihon U.), Y. Ueda, M. Shidatsu, T. Kawamuro, T. Hori (Kyoto U.), Y. Tsuboi, A. Kawagoe (Chuo U.), M. Yamauchi, Y. Morooka, D. Itoh (Miyazaki U.), K. Yamaoka (Nagoya U.) report on behalf of the MAXI team:
  The MAXI/GSC detected a bright uncatalogued hard X-ray transient source around UT 2015-01-10T10:23.37.
  Unfortunately, after MAXI detected the burst for about 10 sec, no data were obtained (or downloaded yet) for 27 seconds. As a result, we can not determine the X-ray flux and the source position correctly. Using the data, we obtain a rectangular error box for the transient source with the following corners:

  (R.A., Dec) = (215.959 deg, 18.705 deg) = (14 23 50, +18 42 18) (J2000)
  (R.A., Dec) = (215.630 deg, 19.420 deg) = (14 22 31, +19 25 10) (J2000)
  (R.A., Dec) = (218.120 deg, 20.331 deg) = (14 32 28, +20 19 52) (J2000)
  (R.A., Dec) = (218.422 deg, 19.605 deg) = (14 33 41, +19 36 18) (J2000)
  

  There is an additional systematic uncertainty of 0.1 deg (90% containment radius).
  The 4-10 keV flux is roughly about 200 mCrab. We also note that Fermi-GBM also detected this burst almost simultaneously.
  There was no significant excess flux in the previous transit at UT 08:50, and in the next transit at UT 11:56 with an upper limit of 20 mCrab for each.
  Detection Information: http://maxi.riken.jp/alert/novae/7032899999/7032899999.htm
• GCN Circular #17292
  Matthew Stanbro (UAH) and H.-F. Yu (MPE) report on behalf of the Fermi GBM Team:
  "At 10:23:38.23 UT on 10 January 2015, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 150110A (trigger 442578221 / 150110433). which was also detected by the MAXI/GSC (Negoro et al. 2015, GCN 17290) The GBM on-ground location is consistent with the MAXI/GSC position.
  The angle from the Fermi LAT boresight is 51 degrees.
  The GBM light curve consists of 2 peaks with a combined duration (T90) of about 74 s (50-300 keV). The time-averaged spectrum from T0-2.05 s to T0+73.73 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.99 +/- 0.06 and the cutoff energy, parameterized as Epeak, is 77.2 +/- 2.7 keV
  The event fluence (10-1000 keV) in this time interval is (2.81 +/- 0.06)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+61.1 s in the 8-1000 keV band is 7.49 +/- .286 ph/s/cm^2.
  The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
• GCN Circular #17299
  E. Gorbovskoy, V. Lipunov, P.Balanutsa, D.Denisenko, M.Pruzhinskaya,A.Kuznetsov, V.Kornilov, D.Kuvshinov, N.Tyurina Lomonosov Moscow State University, Sternberg Astronomical Institute
  O.Gres, K.Ivanov, S.Yazev, N.M.Budnev, V.A.Poleshchuk Irkutsk State University
  V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University
  A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
  V.Krushinsky, I.Zalozhnih, A. Popov Ural Federal University, Kourovka
  D.Buckley, S. Potter, A. Kniazev South African Astronomical Observatory
  H. Levato and C. Saffe Instituto de Ciencias Astronomicas de la Tierra y del Espacio (ICATE), San Juan, Argentina
  C. Mallamacci, C. Lopez and F. Podest Observatorio Astronomico Felix Aguilar (OAFA), San Juan National University, Argentina
  MASTER-Kislovodsk robotic telescope (2x4 square degrees) was pointed to MAXI-Fermi GRB150110A (Negoro et al., GCN 17290; M. Stanbro & H.-F. Yu, GCN 17292) error box 4527 sec after trigger at 22:57:30.179 UT.
  There are no any optical transients inside error box (Negoro et al., GCN 17290;).
  Our upper limit on Kislovodsk and SAAO observatiories available in Table 1.

      T_start    T0-T_start   T0-T_mid       Exptime    Mlimit
                                             (coadd)    
     22:57:30.2   45247sec    47291  sec       3600      20.2
  

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