Gamma-ray Burst 151216A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/MAXI NOTICE
  NOTICE_DATE:     Wed 16 Dec 15 22:53:50 UT
  NOTICE_TYPE:     MAXI Unknown Source Position
  EVENT_ID_NUM:    372632950
  EVENT_RA:        323.91d {+21h 35m 39s} (J2000), 
                   324.09d {+21h 36m 22s} (current),
                   323.35d {+21h 33m 24s} (1950)
  EVENT_DEC:       +24.77d {+24d 46' 19"} (J2000),
                   +24.84d {+24d 50' 38"} (current),
                   +24.55d {+24d 32' 52"} (1950)
  EVENT_ERROR:     1.0 [deg radius, stat+sys, 90% containment]
  EVENT_FLUX:      265.0 +- 0.0 [mCrab] 
  EVENT_DATE:      17372 TJD;   350 DOY;   15/12/16
  EVENT_TIME:      68599.00 SOD {19:03:19.00} UT
  EVENT_TSCALE:    30s
  EVENT_EBAND:     Low, 2-4 keV  
  SUN_POSTN:       264.18d {+17h 36m 44s}  -23.33d {-23d 19' 43"}
  SUN_DIST:         75.44 [deg]  
  MOON_POSTN:      334.19d {+22h 16m 45s}   -8.53d {-08d 31' 48"}
  MOON_DIST:        34.79 [deg]  
  MOON_ILLUM:      32 [%] 
  GAL_COORDS:       76.21,-19.86 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      336.17, 36.67 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        MAXI Unknown Source Position. GRB or unknown X-ray Transient.
  

• GCN Circular #18705
  T. Kawamuro (Kyoto U.), H. Negoro (Nihon U.), S. Nakahira (JAXA), T. Sakamoto (AGU), H. Tomida, M. Ishikawa, Y. E. Nakagawa (JAXA), T. Mihara, M. Sugizaki, M. Serino, M. Shidatsu, J. Sugimoto, T. Takagi, M. Matsuoka (RIKEN), N. Kawai, M. Arimoto, T. Yoshii, Y. Tachibana, Y. Ono, T. Fujiwara (Tokyo Tech), A. Yoshida, Y. Kawakubo, H. Ohtsuki (AGU), H. Tsunemi, R.Imatani (Osaka U.), M. Nakajima, K. Tanaka, T. Masumitsu (Nihon U.), Y. Ueda, T. Hori, A. Tanimoto (Kyoto U.), Y. Tsuboi, S. Kanetou, Y. Nakamura, R. Sasaki (Chuo U.), M. Yamauchi, D. Itoh, K. Furuya (Miyazaki U.), K. Yamaoka (Nagoya U.), M. Morii (ISM) report on behalf of the MAXI team:
  The MAXI/GSC nova alert system triggered a bright uncatalogued X-ray transient source at UT 2015-12-16T19:03:15. Assuming that the source flux was constant over the transit, we obtain the source position at (R.A., Dec) = (323.762 deg, 24.765 deg) = (21 35 02, +24 45 54) (J2000) with a statistical 90% C.L. elliptical error region with long and short radii of 0.32 deg and 0.25 deg, respectively. The roll angle of long axis from the north direction is 162.0 deg counterclockwise. There is an additional systematic uncertainty of 0.1 deg (90% containment radius). The X-ray flux averaged over the scan was 140 +- 25 mCrab (4-10keV, 1 sigma error).
  Without assumptions on the source constancy, we obtain a rectangular error box for the transient source with the following corners:

  (322.253 deg, 24.688 deg) = (21 29 00, +24 41 17) (J2000)
  (322.468 deg, 24.080 deg) = (21 29 52, +24 04 46) (J2000)
  (324.455 deg, 24.613 deg) = (21 37 49, +24 36 46) (J2000)
  (324.259 deg, 25.227 deg) = (21 37 02, +25 13 37) (J2000)
  

  There was no significant excess flux in the previous transit at UT 17:30 and in the next transit at 20:35 UT with an upper limit of 20 mCrab for each.
  Detection Information: http://maxi.riken.jp/alert/novae/7372632950/7372632950.htm