Gamma-ray Burst 200105A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN Notice

TITLE:           GCN/MAXI NOTICE
NOTICE_DATE:     Sun 05 Jan 20 22:06:20 UT
NOTICE_TYPE:     MAXI Unknown Source Position
EVENT_ID_NUM:    853741593
EVENT_RA:        318.94d {+21h 15m 45s} (J2000),
                 319.25d {+21h 16m 59s} (current),
                 318.16d {+21h 12m 39s} (1950)
EVENT_DEC:       -36.33d {-36d 19' 29"} (J2000),
                 -36.24d {-36d 14' 26"} (current),
                 -36.53d {-36d 32' 00"} (1950)
EVENT_ERROR:     1.0 [deg radius, stat+sys, 90% containment]
EVENT_FLUX:      1874.0 +- 0.0 [mCrab]
EVENT_DATE:      18853 TJD;     5 DOY;   20/01/05
EVENT_TIME:      78947.00 SOD {21:55:47.00} UT
EVENT_TSCALE:    1day
EVENT_EBAND:     Low, 2-4 keV
SUN_POSTN:       286.31d {+19h 05m 15s}  -22.59d {-22d 35' 20"}
SUN_DIST:         31.56 [deg] 
MOON_POSTN:       44.04d {+02h 56m 11s}  +12.34d {+12d 20' 25"}
MOON_DIST:        93.15 [deg] 
MOON_ILLUM:      75 [%] 
GAL_COORDS:        7.41,-43.82 [deg] galactic lon,lat of the burst (or transient)        
ECL_COORDS:      310.11,-19.45 [deg] ecliptic lon,lat of the burst (or transient)      
COMMENTS:        MAXI Unknown Source Position. GRB or unknown X-ray Transient.

GCN Circular #26638
S. Sugita, M. Serino (AGU), H. Negoro, M. Nakajima, W. Maruyama, M. Aoki, K. Kobayashi, R. Takagi (Nihon U.), T. Mihara, C. Guo, Y. Zhou, T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, H. Nishida, A. Yoshida (AGU), Y. Tsuboi, W. Iwakiri, R. Sasaki, H. Kawai, T. Sato (Chuo U.), M. Shidatsu (Ehime U.), N. Kawai, M. Oeda, K. Shiraishi (Tokyo Tech), S. Nakahira, Y. Sugawara, S. Ueno, H. Tomida, M. Ishikawa, 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), M. Sugizaki (NAOC) report on behalf of the MAXI team:
The MAXI/GSC nova alert system triggered a bright uncatalogued X-ray transient source at 21:55:28 UT on 2020 January 05. Assuming that the source flux was constant over the transit, we obtain the source position at (R.A., Dec) = (319.281 deg, -35.846 deg) = (21 17 07, -35 50 45) (J2000) with a statistical 90% C.L. elliptical error region with long and short radii of 0.11 deg and 0.1 deg, respectively. The roll angle of long axis from the north direction is 27.0 deg counterclockwise. There is an additional systematic uncertainty of 0.1 deg (90% containment radius).
Without assumptions on the source constancy, we obtain a rectangular error box for the transient source with the following corners:
```
(318.473, -35.441) deg = (21 13 53, -35 26 27) (J2000)
(318.374, -35.646) deg = (21 13 29, -35 38 45) (J2000)
(320.376, -36.262) deg = (21 21 30, -36 15 43) (J2000)
(320.470, -36.054) deg = (21 21 52, -36 03 14) (J2000)
```
The X-ray flux averaged over the scan was 710 +- 50 mCrab (4.0-10.0keV, 1 sigma error).
There was no significant excess flux in the previous transit at 20:42 UT with an upper limit of 20 mCrab.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 05 Jan 20 21:55:54 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      49
TRIGGER_NUM:     599954133
GRB_RA:          319.783d {+21h 19m 08s} (J2000),
                 320.091d {+21h 20m 22s} (current),
                 319.012d {+21h 16m 03s} (1950)
GRB_DEC:         -35.617d {-35d 37' 00"} (J2000),
                 -35.531d {-35d 31' 52"} (current),
                 -35.828d {-35d 49' 40"} (1950)
GRB_ERROR:       25.90 [deg radius, statistical plus systematic]
GRB_INTEN:       102 [cnts/sec]
DATA_SIGNIF:     6.00 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        18853 TJD;     5 DOY;   20/01/05
GRB_TIME:        78928.99 SOD {21:55:28.99} UT
GRB_PHI:          21.00 [deg]
GRB_THETA:       105.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      2.05
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      54%  Solar Flare
2nd_MOST_LIKELY:  29%  GRB
DETECTORS:       0,0,1, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       286.30d {+19h 05m 13s}  -22.59d {-22d 35' 23"}
SUN_DIST:         32.04 [deg]   Sun_angle= -2.3 [hr] (East of Sun)
MOON_POSTN:       43.96d {+02h 55m 50s}  +12.31d {+12d 18' 35"}
MOON_DIST:        92.23 [deg]
MOON_ILLUM:      75 [%]
GAL_COORDS:        8.47,-44.44 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      311.03,-19.00 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200105914/quicklook/glg_lc_medres34_bn200105914.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 173.27,23.75 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 05 Jan 20 21:56:02 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      59
TRIGGER_NUM:     599954133
GRB_RA:          319.750d {+21h 19m 00s} (J2000),
                 320.058d {+21h 20m 14s} (current),
                 318.979d {+21h 15m 55s} (1950)
GRB_DEC:         -35.733d {-35d 43' 59"} (J2000),
                 -35.648d {-35d 38' 52"} (current),
                 -35.945d {-35d 56' 39"} (1950)
GRB_ERROR:       12.42 [deg radius, statistical plus systematic]
GRB_INTEN:       128 [cnts/sec]
DATA_SIGNIF:     10.00 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        18853 TJD;     5 DOY;   20/01/05
GRB_TIME:        78928.99 SOD {21:55:28.99} UT
GRB_PHI:          21.00 [deg]
GRB_THETA:       105.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      2.08
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      60%  Solar Flare
2nd_MOST_LIKELY:  26%  GRB
DETECTORS:       0,0,1, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       286.30d {+19h 05m 13s}  -22.59d {-22d 35' 23"}
SUN_DIST:         32.04 [deg]   Sun_angle= -2.3 [hr] (East of Sun)
MOON_POSTN:       43.96d {+02h 55m 50s}  +12.31d {+12d 18' 37"}
MOON_DIST:        92.29 [deg]
MOON_ILLUM:      75 [%]
GAL_COORDS:        8.31,-44.43 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      310.97,-19.10 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200105914/quicklook/glg_lc_medres34_bn200105914.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 173.27,23.75 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

Back to JG's homepage

Jochen Greiner, last update: 07-Jan-2020 [Disclaimer ]