Gamma-ray Burst 190706A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN Notice
  

  TITLE:           GCN/MAXI NOTICE
  NOTICE_DATE:     Sat 06 Jul 19 09:18:42 UT
  NOTICE_TYPE:     MAXI Unknown Source Position
  EVENT_ID_NUM:    670147721
  EVENT_RA:         26.61d {+01h 46m 25s} (J2000),
                    26.81d {+01h 47m 14s} (current),
                    26.08d {+01h 44m 19s} (1950)
  EVENT_DEC:       -43.25d {-43d 14' 51"} (J2000),
                   -43.15d {-43d 09' 02"} (current),
                   -43.50d {-43d 29' 50"} (1950)
  EVENT_ERROR:     1.0 [deg radius, stat+sys, 90% containment]
  EVENT_FLUX:      53.0 +- 0.0 [mCrab]
  EVENT_DATE:      18670 TJD;   187 DOY;   19/07/06
  EVENT_TIME:      12405.00 SOD {03:26:45.00} UT
  EVENT_TSCALE:    1day
  EVENT_EBAND:     Medium, 4-10 keV
  SUN_POSTN:       105.25d {+07h 01m 00s}  +22.70d {+22d 41' 44"}
  SUN_DIST:         97.41 [deg] 
  MOON_POSTN:      156.31d {+10h 25m 15s}  +13.82d {+13d 49' 18"}
  MOON_DIST:       127.88 [deg] 
  MOON_ILLUM:      17 [%] 
  GAL_COORDS:      271.85,-70.41 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:        2.35,-49.32 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        MAXI Unknown Source Position. GRB or unknown X-ray Transient.
  

• GCN Circular #24992
  K. Shiraishi (Tokyo Tech), H. Negoro, M. Nakajima, W. Maruyama, M. Aoki, K. Kobayashi (Nihon U.), S. Nakahira, T. Mihara, T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, M. Serino, S. Sugita, H. Nishida, A. Yoshida (AGU), Y. Tsuboi, W. Iwakiri, R. Sasaki, H. Kawai, T. Sato (Chuo U.), M. Shidatsu (Ehime U.), N. Kawai, M. Sugizaki, M. Oeda (Tokyo Tech), S. Ueno, H. Tomida, M. Ishikawa, Y. Sugawara, N. Isobe, R. Shimomukai, M. Tominaga (JAXA), Y. Ueda, A. Tanimoto, S. Yamada, S. Ogawa, K. Setoguchi, T. Yoshitake (Kyoto U.), H. Tsunemi, T. Yoneyama, K. Asakura, S. Ide (Osaka U.), M. Yamauchi, S. Iwahori, Y. Kurihara, K. Kurogi, K. Miike (Miyazaki U.), T. Kawamuro (NAOJ), K. Yamaoka (Nagoya U.), Y. Kawakubo (LSU)
  report on behalf of the MAXI team:
  The MAXI/GSC nova alert system triggered an uncatalogued X-ray transient source at 03:26:23 UT on July 6, 2019.
  Assuming that the source flux was constant over the transit, we obtain the source position at (R.A., Dec) = (26.605 deg, -43.248 deg) = (01 46 25, -43 14 52) (J2000) with a statistical 90% C.L. elliptical error region with long and short radii of 0.39 deg and 0.36 deg, respectively. The roll angle of the long axis from the north direction is 51.0 deg counterclockwise. There is an additional systematic uncertainty of 0.1 deg (90% containment radius). The X-ray flux averaged over the scan was 53 +- 16 mCrab (4.0-10.0keV, 1 sigma error). Without assumptions on the source constancy,we obtain a rectangular error box for the transient source with the following corners:

  (R.A., Dec) = (26.800, -41.863) deg = (01 47 11, -41 51 46) (J2000)
  (R.A., Dec) = (25.798, -41.961) deg = (01 43 11, -41 57 39) (J2000)
  (R.A., Dec) = (26.264, -44.604) deg = (01 45 03, -44 36 14) (J2000)
  (R.A., Dec) = (27.310, -44.502) deg = (01 49 14, -44 30 07) (J2000)
  

  There was no significant excess flux in the previous transit at UT 01:53 and in the next transit at 04:59 UT with an upper limit of 20 mCrab for each.