Gamma-ray Burst 140515B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN NOTICE
  

  TITLE:           GCN/MAXI NOTICE
  NOTICE_DATE:     Thu 15 May 14 20:20:50 UT
  NOTICE_TYPE:     MAXI Unknown Source Position
  EVENT_ID_NUM:    792429074
  EVENT_RA:        289.47d {+19h 17m 52s} (J2000),
                   289.66d {+19h 18m 40s} (current), 
                   288.77d {+19h 15m 06s} (1950)
  EVENT_DEC:       -11.00d {-10d 59' 51"} (J2000),
                   -10.97d {-10d 58' 15"} (current),
                   -11.09d {-11d 05' 20"} (1950)
  EVENT_ERROR:     1.0 [deg radius, stat+sys, 90% containment]
  EVENT_FLUX:      163.0 +- 0.0 [mCrab] 
  EVENT_DATE:      16792 TJD;   135 DOY;   14/05/15 
  EVENT_TIME:      46853.00 SOD {13:00:53.00} UT 
  EVENT_TSCALE:    10s
  EVENT_EBAND:     Low, 2-4 keV
  SUN_POSTN:        52.57d {+03h 30m 16s}  +19.00d {+18d 59' 44"}
  SUN_DIST:        124.49 [deg]
  MOON_POSTN:      247.49d {+16h 29m 59s}  -18.47d {-18d 28' 24"}
  MOON_DIST:        41.37 [deg]
  MOON_ILLUM:      99 [%]
  GAL_COORDS:       26.02,-10.81 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      289.48, 11.13 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        MAXI Unknown Source Position. GRB or unknown X-ray Transient.
  

• GCN Circular #16276
  M. Morii (RIKEN), S. Ueno, H. Tomida, S. Nakahira, M. Kimura, M. Ishikawa, Y. E. Nakagawa (JAXA), T. Mihara, M. Sugizaki, J. Sugimoto, T. Takagi, A. Yoshikawa, M. Matsuoka (RIKEN), N. Kawai, T. Yoshii, Y. Tachibana (Tokyo Tech), A. Yoshida, T. Sakamoto, 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 (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 2014-05-15T13:00:53 UT. Assuming that the source flux was constant over the transit, we obtain the source position at
  (R.A., Dec) = (289.354 deg, -11.701 deg) = (19 17 24, -11 42 03) (J2000)
  with a rectangular error box in the following corners:

   
  (289.185 deg, -12.277 deg) = (19 16 44, -12 16 38) (J2000)
  (288.651 deg, -11.941 deg) = (19 14 36, -11 56 28) (J2000)  
  (289.546 deg, -10.794 deg) = (19 18 11, -10 47 39) (J2000)
  (290.074 deg, -11.136 deg) = (19 20 17, -11 08 10) (J2000).
   

  There is an additional systematic uncertainty of 0.1 deg (90% containment radius). The X-ray flux averaged over the scan was 80 +- 18 mCrab (4-10keV, 1 sigma error). There was no significant excess flux in the previous transit at UT 11:28 and in the next transit at 14:33 UT with an upper limit of 20 mCrab for each.