Gamma-ray Burst 140509B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN NOTICE
  

  TITLE:           GCN/MAXI NOTICE
  NOTICE_DATE:     Fri 09 May 14 16:35:20 UT
  NOTICE_TYPE:     MAXI Unknown Source Position
  EVENT_ID_NUM:    786530639
  EVENT_RA:        313.12d {+20h 52m 29s} (J2000),
                   313.28d {+20h 53m 08s} (current),
                   312.56d {+20h 50m 14s} (1950)
  EVENT_DEC:       +21.16d {+21d 09' 18"} (J2000),
                   +21.21d {+21d 12' 35"} (current),
                   +20.97d {+20d 57' 57"} (1950)
  EVENT_ERROR:     1.0 [deg radius, stat+sys, 90% containment]
  EVENT_FLUX:      373.0 +- 0.0 [mCrab] 
  EVENT_DATE:      16786 TJD;   129 DOY;   14/05/09
  EVENT_TIME:      58718.00 SOD {16:18:38.00} UT
  EVENT_TSCALE:    10s
  EVENT_EBAND:     Low, 2-4 keV
  SUN_POSTN:        46.52d {+03h 06m 05s}  +17.46d {+17d 27' 43"}
  SUN_DIST:         86.66 [deg] 
  MOON_POSTN:      166.86d {+11h 07m 27s}   +1.84d {+01d 50' 32"}
  MOON_DIST:       139.88 [deg] 
  MOON_ILLUM:      74 [%] 
  GAL_COORDS:       66.55,-14.70 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      322.96, 37.01 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        MAXI Unknown Source Position. GRB or unknown X-ray Transient.
  

• GCN NOTICE
  

   
  TITLE:           GCN/MAXI NOTICE
  NOTICE_DATE:     Fri 09 May 14 17:25:57 UT
  NOTICE_TYPE:     MAXI Unknown Source Position
  EVENT_ID_NUM:    786530639
  EVENT_RA:        312.97d {+20h 51m 52s} (J2000),
                   313.13d {+20h 52m 31s} (current),
                   312.40d {+20h 49m 37s} (1950)
  EVENT_DEC:       +21.02d {+21d 00' 57"} (J2000),
                   +21.07d {+21d 04' 14"} (current),
                   +20.83d {+20d 49' 38"} (1950)
  EVENT_ERROR:     1.0 [deg radius, stat+sys, 90% containment]
  EVENT_FLUX:      98.0 +- 0.0 [mCrab]
  EVENT_DATE:      16786 TJD;   129 DOY;   14/05/09
  EVENT_TIME:      58718.00 SOD {16:18:38.00} UT
  EVENT_TSCALE:    10s
  EVENT_EBAND:     Low, 2-4 keV
  SUN_POSTN:        46.55d {+03h 06m 13s}  +17.47d {+17d 28' 16"}
  SUN_DIST:         86.86 [deg]
  MOON_POSTN:      167.27d {+11h 09m 05s}   +1.70d {+01d 42' 08"}
  MOON_DIST:       139.58 [deg]
  MOON_ILLUM:      74 [%]
  GAL_COORDS:       66.34,-14.67 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      322.73, 36.92 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        MAXI Unknown Source Position. GRB or unknown X-ray Transient.
  

• GCN Circular #16242
  M. Kimura, S. Nakahira (JAXA), M. Serino (RIKEN), T. Sakamoto (AGU), S. Ueno, H. Tomida, M. Ishikawa, Y. E. Nakagawa (JAXA), T. Mihara, M. Sugizaki, M. Morii, J. Sugimoto, T. Takagi, A. Yoshikawa, M. Matsuoka (RIKEN), N. Kawai, T. Yoshii, Y. Tachibana (Tokyo Tech), A. Yoshida, Y. Kawakubo, H. Ohtsuki (AGU), H. Tsunemi, D. Uchida (Osaka U.), H. Negoro, M. Nakajima, K. Fukushima, T. Onodera, K. Suzuki (Nihon U.), Y. Ueda, M. Shidatsu, T. Kawamuro, T. Hori (Kyoto U.), Y. Tsuboi, M. Higa (Chuo U.), M. Yamauchi, Y. Morooka (Miyazaki U.), K. Yamaoka (Nagoya U.) report on behalf of the MAXI team:
  The MAXI/GSC nova alert system triggered a bright uncatalogued X-ray transient source at 2014-05-09T16:18:38 UT. Assuming that the source flux was constant over the transit, we obtain the source position at
  (R.A., Dec) = (312.966 deg, 21.016 deg) = (20 51 51, +21 00 57) (J2000)
  with a statistical 90% C.L. elliptical error region with long and short radii of 0.27 deg and 0.24 deg respectively. The roll angle of long axis from the north direction is 124.0 deg counterclockwise. Without the assumption about the source constancy, we obtain a rectangular error box for the transient source with the following corners:

  (312.482 deg, 20.145 deg) = (20 49 55, +20 08 40) (J2000)
  (312.039 deg, 20.483 deg) = (20 48 09, +20 28 59) (J2000)
  (313.694 deg, 22.120 deg) = (20 54 46, +22 07 11) (J2000)
  (314.137 deg, 21.776 deg) = (20 56 32, +21 46 32) (J2000)
  

  There is an additional systematic uncertainty of 0.1 deg (90% containment radius). The X-ray flux averaged over the scan was 98 +- 23 mCrab (4-10keV, 1 sigma error). There was no significant excess flux in the previous transit at UT 14:45 with an upper limit of 20 mCrab.