Gamma-ray Burst 171112A

(All information courtesy of the instrument teams.)

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Results of Observations

GCN NOTICE

TITLE:           GCN/MAXI NOTICE
NOTICE_DATE:     Sun 12 Nov 17 20:59:40 UT
NOTICE_TYPE:     MAXI Unknown Source Position
EVENT_ID_NUM:    69695336
EVENT_RA:         20.08d {+01h 20m 18s} (J2000), 
                  20.25d {+01h 20m 59s} (current),
                  19.60d {+01h 18m 23s} (1950)
EVENT_DEC:       -59.64d {-59d 38' 26"} (J2000),
                 -59.55d {-59d 32' 50"} (current),
                 -59.90d {-59d 54' 09"} (1950)
EVENT_ERROR:     1.0 [deg radius, stat+sys, 90% containment]
EVENT_FLUX:      815.0 +- 0.0 [mCrab] 
EVENT_DATE:      18069 TJD;   316 DOY;   17/11/12
EVENT_TIME:      75001.00 SOD {20:50:01.00} UT
EVENT_TSCALE:    4orbit        
EVENT_EBAND:     Low, 2-4 keV  
SUN_POSTN:       228.23d {+15h 12m 56s}  -17.92d {-17d 55' 02"}
SUN_DIST:         99.24 [deg]  
MOON_POSTN:      167.68d {+11h 10m 42s}   +7.66d {+07d 39' 30"}
MOON_DIST:       122.56 [deg]  
MOON_ILLUM:      29 [%]        
GAL_COORDS:      296.22,-57.11 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      338.81,-59.39 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        MAXI Unknown Source Position. GRB or unknown X-ray Transient.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 12 Nov 17 20:50:41 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      46
TRIGGER_NUM:     532212622
GRB_RA:          166.983d {+11h 07m 56s} (J2000),
                 167.153d {+11h 08m 37s} (current),
                 166.512d {+11h 06m 03s} (1950)
GRB_DEC:         -69.433d {-69d 25' 59"} (J2000),
                 -69.530d {-69d 31' 48"} (current),
                 -69.162d {-69d 09' 43"} (1950)
GRB_ERROR:       21.47 [deg radius, statistical plus systematic]
GRB_INTEN:       605 [cnts/sec]
DATA_SIGNIF:     6.00 [sigma]
INTEG_TIME:      0.128 [sec]
GRB_DATE:        18069 TJD;   316 DOY;   17/11/12
GRB_TIME:        75017.15 SOD {20:50:17.15} UT
GRB_PHI:         164.00 [deg]
GRB_THETA:       140.00 [deg]
DATA_TIME_SCALE: 0.1280 [sec]
HARD_RATIO:      0.75
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   2%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 0,0,0, 1,0,1, 0,0,
SUN_POSTN:       228.23d {+15h 12m 54s}  -17.92d {-17d 54' 56"}
SUN_DIST:         63.31 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      167.60d {+11h 10m 24s}   +7.68d {+07d 41' 02"}
MOON_DIST:        77.21 [deg]
MOON_ILLUM:      29 [%]
GAL_COORDS:      294.02, -8.37 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      221.22,-62.93 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn171112868/quicklook/glg_lc_medres34_bn171112868.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 51.48,-7.27 [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 12 Nov 17 20:50:55 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     532212622
GRB_RA:          238.970d {+15h 55m 53s} (J2000),
                 239.403d {+15h 57m 37s} (current),
                 237.766d {+15h 51m 04s} (1950)
GRB_DEC:         -67.260d {-67d 15' 35"} (J2000),
                 -67.311d {-67d 18' 38"} (current),
                 -67.114d {-67d 06' 49"} (1950)
GRB_ERROR:       94.92 [deg radius, statistical only]
DATA_SIGNIF:     7.20 [sigma]
DATA_INTERVAL:   0.064 [sec]
GRB_DATE:        18069 TJD;   316 DOY;   17/11/12
GRB_TIME:        75017.15 SOD {20:50:17.15} UT
GRB_PHI:         123.00 [deg]
GRB_THETA:       147.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       228.23d {+15h 12m 54s}  -17.92d {-17d 54' 56"}
SUN_DIST:         49.92 [deg]   Sun_angle= -0.7 [hr] (East of Sun)
MOON_POSTN:      167.60d {+11h 10m 24s}   +7.68d {+07d 40' 60"}
MOON_DIST:        90.23 [deg]
MOON_ILLUM:      29 [%]
GAL_COORDS:      319.39,-10.49 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      253.45,-45.59 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn171112868/quicklook/glg_lc_medres34_bn171112868.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_532212622.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 12 Nov 17 20:51:21 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      0
TRIGGER_NUM:     532212622
GRB_RA:           14.990d {+00h 59m 58s} (J2000),
                  15.174d {+01h 00m 42s} (current),
                  14.474d {+00h 57m 54s} (1950)
GRB_DEC:         -60.290d {-60d 17' 23"} (J2000),
                 -60.194d {-60d 11' 37"} (current),
                 -60.559d {-60d 33' 32"} (1950)
GRB_ERROR:       8.41 [deg radius, statistical only]
DATA_SIGNIF:     19.90 [sigma]
DATA_INTERVAL:   5.120 [sec]
GRB_DATE:        18069 TJD;   316 DOY;   17/11/12
GRB_TIME:        75017.15 SOD {20:50:17.15} UT
GRB_PHI:         132.00 [deg]
GRB_THETA:        99.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       228.23d {+15h 12m 54s}  -17.92d {-17d 54' 56"}
SUN_DIST:         97.44 [deg]   Sun_angle= -9.8 [hr] (East of Sun)
MOON_POSTN:      167.60d {+11h 10m 25s}   +7.68d {+07d 40' 55"}
MOON_DIST:       123.55 [deg]
MOON_ILLUM:      29 [%]
GAL_COORDS:      301.00,-56.81 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      334.55,-57.98 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn171112868/quicklook/glg_lc_medres34_bn171112868.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_532212622.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(2.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=7965).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 12 Nov 17 20:51:26 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      1
TRIGGER_NUM:     532212622
GRB_RA:           24.280d {+01h 37m 07s} (J2000),
                  24.466d {+01h 37m 52s} (current),
                  23.757d {+01h 35m 02s} (1950)
GRB_DEC:         -46.010d {-46d 00' 35"} (J2000),
                 -45.919d {-45d 55' 09"} (current),
                 -46.264d {-46d 15' 50"} (1950)
GRB_ERROR:       3.07 [deg radius, statistical only]
DATA_SIGNIF:     29.80 [sigma]
DATA_INTERVAL:   7.168 [sec]
GRB_DATE:        18069 TJD;   316 DOY;   17/11/12
GRB_TIME:        75017.15 SOD {20:50:17.15} UT
GRB_PHI:         135.00 [deg]
GRB_THETA:        84.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       228.23d {+15h 12m 54s}  -17.92d {-17d 54' 57"}
SUN_DIST:        112.63 [deg]   Sun_angle= -10.4 [hr] (East of Sun)
MOON_POSTN:      167.60d {+11h 10m 25s}   +7.68d {+07d 40' 54"}
MOON_DIST:       130.36 [deg]
MOON_ILLUM:      29 [%]
GAL_COORDS:      280.30,-69.06 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      357.81,-50.69 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn171112868/quicklook/glg_lc_medres34_bn171112868.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_532212622.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(2.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=7965).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 12 Nov 17 20:51:43 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      2
TRIGGER_NUM:     532212622
GRB_RA:           12.680d {+00h 50m 43s} (J2000),
                  12.884d {+00h 51m 32s} (current),
                  12.107d {+00h 48m 26s} (1950)
GRB_DEC:         -48.440d {-48d 26' 23"} (J2000),
                 -48.343d {-48d 20' 34"} (current),
                 -48.712d {-48d 42' 42"} (1950)
GRB_ERROR:       2.31 [deg radius, statistical only]
DATA_SIGNIF:     35.10 [sigma]
DATA_INTERVAL:   13.312 [sec]
GRB_DATE:        18069 TJD;   316 DOY;   17/11/12
GRB_TIME:        75017.15 SOD {20:50:17.15} UT
GRB_PHI:         128.00 [deg]
GRB_THETA:        88.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       228.23d {+15h 12m 54s}  -17.92d {-17d 54' 57"}
SUN_DIST:        106.62 [deg]   Sun_angle= -9.6 [hr] (East of Sun)
MOON_POSTN:      167.61d {+11h 10m 26s}   +7.68d {+07d 40' 52"}
MOON_DIST:       134.07 [deg]
MOON_ILLUM:      29 [%]
GAL_COORDS:      303.26,-68.69 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      345.78,-48.11 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn171112868/quicklook/glg_lc_medres34_bn171112868.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_532212622.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(2.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=7965).

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sun 12 Nov 17 20:51:17 UT
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    7965,   Sub_Num: 0
GRB_INTEN:      9.33 [sigma]
GRB_TIME:       75015.07 SOD {20:50:15.07} UT
GRB_DATE:       18069 TJD;   316 DOY;   17/11/12
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.  
COMMENTS:       Time_Scale=2.0000 and Time_Error=1.0000.  
COMMENTS:          
COMMENTS:       NOTE: This SPIACS event is temporally(2.0<100sec) coincident with the FERMI_GBM event (trignum=532212622).  
COMMENTS:          
COMMENTS:       The SPIACS lightcurve can be found at:  
COMMENTS:       ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2017-11/2017-11-12T20-50-14.9226-20667-15248-0.lc

GCN Circular #22118
GRB 171112A: MAXI/GSC detection
S. Sugita (Tokyo Tech), H. Negoro (Nihon U.), S. Nakahira (RIKEN), S. Ueno, H. Tomida, M. Ishikawa, Y. Sugawara, N. Isobe, R. Shimomukai (JAXA), T. Mihara, M. Sugizaki, W. Iwakiri, M. Shidatsu, F. Yatabe, Y. Takao, M. Matsuoka (RIKEN), N. Kawai, T. Yoshii, Y. Tachibana, S. Harita, Y. Muraki, K. Morita (Tokyo Tech), A. Yoshida, T. Sakamoto, M. Serino, Y. Kawakubo, Y. Kitaoka, T. Hashimoto (AGU), H. Tsunemi, T. Yoneyama (Osaka U.), M. Nakajima, T. Kawase, A. Sakamaki (Nihon U.), Y. Ueda, T. Hori, A. Tanimoto, S. Oda, T. Morita, S. Yamada (Kyoto U.), Y. Tsuboi, R. Sasaki, Y. Nakamura, H. Kawai (Chuo U.), M. Yamauchi, C. Hanyu, K, Hidaka (Miyazaki U.), T. Kawamuro (NAOJ), K. Yamaoka (Nagoya U.)
The MAXI/GSC nova alert system triggered a bright uncatalogued X-ray transient source at 20:50:01 UT on 2017 November 12. Assuming that the source flux was constant over the transit, we obtain the source position at (R.A., Dec) = (20.467 deg, -59.678 deg) = (01 21 52, -59 40 40) (J2000) with a statistical 90% C.L. elliptical error region with long and short radii of 0.17 deg and 0.12 deg, respectively. The roll angle of long axis from the north direction is 107.0 deg counterclockwise. There is an additional systematic uncertainty of 0.1 deg (90% containment radius).
We estimated a rectangular error box for the transient source with the following corners which were independently calculated with respect to each camera.
camera 2:
```
(20.320, -61.117) deg = (01 21 16, -61 07 01) (J2000)
(19.513, -61.013) deg = (01 18 03, -61 00 47) (J2000)
(21.134, -58.662) deg = (01 24 32, -58 39 42) (J2000)
(21.890, -58.756) deg = (01 27 33, -58 45 23) (J2000)
```
camera 7:
```
(19.831, -60.456) deg = (01 19 19, -60 27 20) (J2000)
(19.396, -60.398) deg = (01 17 35, -60 23 51) (J2000)
(20.488, -58.842) deg = (01 21 57, -58 50 31) (J2000)
(20.905, -58.897) deg = (01 23 37, -58 53 48) (J2000)
```
There is an additional systematic uncertainty of 0.1 deg (90% containment radius).
The X-ray flux averaged over the scan was 437 +- 44 mCrab (4.0-10.0keV, 1 sigma error). There was no significant excess flux in the previous transit at UT 19:14 and in the next transit at UT 22:19:10 with an upper limit of 20 mCrab for each.
GCN Circular #22121
D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, P. Oleynik, M. Ulanov, A. Tsvetkova, A. Lysenko, A.Kozlova, and T. Cline on behalf of the Konus-Wind team, report:
The long-duration GRB 171112A (MAXI/GSC detection: Sugita et al., GCN Circ. 22118) triggered Konus-Wind at T0=75019.162 s UT (20:50:19.162).
The burst light curve shows multipeaked structure which starts at ~T0-204 s and has a total duration of ~310 s. The emission is seen up to ~2 MeV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB171112_T75019/
As observed by Konus-Wind, the burst had a fluence of 1.80(-0.33,+0.47)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+0.720 s, of 2.43(-0.97,+1.17)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the burst (measured from T0 to T0+16.640 s) is best fit in the 30 keV - 10 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.51(-0.30,+0.38), the high energy photon index beta = -2.67(-1.20,+0.44), the peak energy Ep = 200(-30,+34) keV (chi2 = 91/82 dof).
All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
GCN Circular #22123
M. Stanbro, R. Hamburg, and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 20:50:17.15 UT on 12 November 2017, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 171112A (trigger 532212622 / 171112868) which was also detected by the MAXI/GSC (Sugita et al. 2017, GCN 22118) The GBM on-ground location is consistent with the MAXI position.
The angle from the Fermi LAT boresight at the GBM trigger time is 99 degrees.
The GBM light curve consists of multiple episodes with a duration (T90) of about 145 s (50-300 keV). The time-averaged spectrum from T0-45.44 s to T0+104.07 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.49 +/- 0.06 and the cutoff energy, parameterized as Epeak, is 198 +/- 38 keV.
The event fluence (10-1000 keV) in this time interval is (1.75 +/- 0.06)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+1.73 s in the 10-1000 keV band is 6.50 +/- 0.31 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."

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Jochen Greiner, last update: 14-Nov-2017 [Disclaimer]