Gamma-ray Burst 131118A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 18 Nov 13 22:59:22 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      48
TRIGGER_NUM:     406508340
GRB_RA:          350.100d {+23h 20m 24s} (J2000),
                 350.311d {+23h 21m 15s} (current),
                 349.333d {+23h 17m 20s} (1950)
GRB_DEC:         -68.483d {-68d 28' 59"} (J2000),
                 -68.407d {-68d 24' 25"} (current),
                 -68.757d {-68d 45' 25"} (1950)
GRB_ERROR:       12.05 [deg radius, statistical plus systematic]
GRB_INTEN:       355 [cnts/sec]
DATA_SIGNIF:     5.60 [sigma]
INTEG_TIME:      0.512 [sec]
GRB_DATE:        16614 TJD;   322 DOY;   13/11/18
GRB_TIME:        82737.47 SOD {22:58:57.47} UT
GRB_PHI:          40.00 [deg]
GRB_THETA:       150.00 [deg]
DATA_TIME_SCALE: 0.5120 [sec]
HARD_RATIO:      0.42
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      94%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       1,0,1, 0,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       234.47d {+15h 37m 53s}  -19.43d {-19d 25' 56"}
SUN_DIST:         80.90 [deg]   Sun_angle= -7.7 [hr] (East of Sun)
MOON_POSTN:       70.56d {+04h 42m 14s}  +19.21d {+19d 12' 37"}
MOON_DIST:       104.30 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      314.82,-46.49 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      310.18,-55.94 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 222.07,12.65 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 18 Nov 13 22:59:31 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      58
TRIGGER_NUM:     406508340
GRB_RA:            4.367d {+00h 17m 28s} (J2000),
                   4.528d {+00h 18m 07s} (current),
                   3.783d {+00h 15m 08s} (1950)
GRB_DEC:         -70.633d {-70d 37' 59"} (J2000),
                 -70.556d {-70d 33' 21"} (current),
                 -70.911d {-70d 54' 39"} (1950)
GRB_ERROR:       6.65 [deg radius, statistical plus systematic]
GRB_INTEN:       291 [cnts/sec]
DATA_SIGNIF:     11.10 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        16614 TJD;   322 DOY;   13/11/18
GRB_TIME:        82737.47 SOD {22:58:57.47} UT
GRB_PHI:          36.00 [deg]
GRB_THETA:       155.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.38
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       1,0,1, 0,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       234.47d {+15h 37m 53s}  -19.43d {-19d 25' 56"}
SUN_DIST:         83.59 [deg]   Sun_angle= -8.7 [hr] (East of Sun)
MOON_POSTN:       70.56d {+04h 42m 14s}  +19.21d {+19d 12' 38"}
MOON_DIST:       100.52 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      306.99,-46.23 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      313.20,-61.12 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 222.07,12.65 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 18 Nov 13 22:59:36 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     406508340
GRB_RA:          355.870d {+23h 43m 29s} (J2000),
                 356.061d {+23h 44m 15s} (current),
                 355.177d {+23h 40m 42s} (1950)
GRB_DEC:         -67.360d {-67d 21' 35"} (J2000),
                 -67.283d {-67d 16' 57"} (current),
                 -67.638d {-67d 38' 14"} (1950)
GRB_ERROR:       4.56 [deg radius, statistical only]
DATA_SIGNIF:     10.80 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        16614 TJD;   322 DOY;   13/11/18
GRB_TIME:        82737.47 SOD {22:58:57.47} UT
GRB_PHI:          43.00 [deg]
GRB_THETA:       152.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       234.47d {+15h 37m 53s}  -19.43d {-19d 25' 56"}
SUN_DIST:         83.33 [deg]   Sun_angle= -8.1 [hr] (East of Sun)
MOON_POSTN:       70.56d {+04h 42m 14s}  +19.21d {+19d 12' 38"}
MOON_DIST:       101.89 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      312.70,-48.46 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      314.36,-56.69 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 18 Nov 13 22:59:40 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      68
TRIGGER_NUM:     406508340
GRB_RA:          347.520d {+23h 10m 05s} (J2000),
                 347.739d {+23h 10m 57s} (current),
                 346.724d {+23h 06m 54s} (1950)
GRB_DEC:         -68.140d {-68d 08' 23"} (J2000),
                 -68.065d {-68d 03' 51"} (current),
                 -68.411d {-68d 24' 40"} (1950)
GRB_ERROR:       2.50 [deg radius, statistical only]
DATA_SIGNIF:     19.70 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        16614 TJD;   322 DOY;   13/11/18
GRB_TIME:        82737.47 SOD {22:58:57.47} UT
GRB_PHI:          41.00 [deg]
GRB_THETA:       149.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       234.47d {+15h 37m 53s}  -19.43d {-19d 25' 56"}
SUN_DIST:         80.24 [deg]   Sun_angle= -7.6 [hr] (East of Sun)
MOON_POSTN:       70.56d {+04h 42m 14s}  +19.21d {+19d 12' 38"}
MOON_DIST:       105.14 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      316.26,-46.28 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      309.37,-55.04 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 18 Nov 13 22:59:48 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      71
TRIGGER_NUM:     406508340
GRB_RA:          355.260d {+23h 41m 02s} (J2000),
                 355.455d {+23h 41m 49s} (current),
                 354.550d {+23h 38m 12s} (1950)
GRB_DEC:         -70.220d {-70d 13' 11"} (J2000),
                 -70.143d {-70d 08' 34"} (current),
                 -70.497d {-70d 29' 49"} (1950)
GRB_ERROR:       1.99 [deg radius, statistical only]
DATA_SIGNIF:     27.20 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        16614 TJD;   322 DOY;   13/11/18
GRB_TIME:        82737.47 SOD {22:58:57.47} UT
GRB_PHI:          38.00 [deg]
GRB_THETA:       152.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       234.47d {+15h 37m 53s}  -19.43d {-19d 25' 57"}
SUN_DIST:         81.49 [deg]   Sun_angle= -8.1 [hr] (East of Sun)
MOON_POSTN:       70.56d {+04h 42m 15s}  +19.21d {+19d 12' 38"}
MOON_DIST:       103.12 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      311.36,-45.74 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      310.14,-58.45 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 18 Nov 13 22:59:58 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      72
TRIGGER_NUM:     406508340
GRB_RA:          350.110d {+23h 20m 26s} (J2000),
                 350.321d {+23h 21m 17s} (current),
                 349.343d {+23h 17m 22s} (1950)
GRB_DEC:         -68.410d {-68d 24' 35"} (J2000),
                 -68.334d {-68d 20' 01"} (current),
                 -68.684d {-68d 41' 01"} (1950)
GRB_ERROR:       1.86 [deg radius, statistical only]
DATA_SIGNIF:     29.50 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        16614 TJD;   322 DOY;   13/11/18
GRB_TIME:        82737.47 SOD {22:58:57.47} UT
GRB_PHI:          42.00 [deg]
GRB_THETA:       150.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       234.47d {+15h 37m 53s}  -19.43d {-19d 25' 57"}
SUN_DIST:         80.94 [deg]   Sun_angle= -7.7 [hr] (East of Sun)
MOON_POSTN:       70.56d {+04h 42m 15s}  +19.21d {+19d 12' 38"}
MOON_DIST:       104.28 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      314.87,-46.55 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      310.27,-55.89 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 18 Nov 13 22:59:44 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      69
TRIGGER_NUM:     406508340
GRB_RA:            3.833d {+00h 15m 20s} (J2000),
                   3.999d {+00h 16m 00s} (current),
                   3.231d {+00h 12m 55s} (1950)
GRB_DEC:         -65.817d {-65d 49' 00"} (J2000),
                 -65.740d {-65d 44' 22"} (current),
                 -66.095d {-66d 05' 39"} (1950)
GRB_ERROR:       8.28 [deg radius, statistical plus systematic]
GRB_INTEN:       155 [cnts/sec]
DATA_SIGNIF:     17.90 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        16614 TJD;   322 DOY;   13/11/18
GRB_TIME:        82737.47 SOD {22:58:57.47} UT
GRB_PHI:          48.00 [deg]
GRB_THETA:       155.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.21
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       1,0,1, 0,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       234.47d {+15h 37m 53s}  -19.43d {-19d 25' 56"}
SUN_DIST:         86.75 [deg]   Sun_angle= -8.6 [hr] (East of Sun)
MOON_POSTN:       70.56d {+04h 42m 14s}  +19.21d {+19d 12' 38"}
MOON_DIST:        98.37 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      308.78,-50.90 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      320.43,-57.98 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 222.07,12.65 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 18 Nov 13 23:00:01 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      90
TRIGGER_NUM:     406508340
GRB_RA:          352.270d {+23h 29m 05s} (J2000),
                 352.476d {+23h 29m 54s} (current),
                 351.521d {+23h 26m 05s} (1950)
GRB_DEC:         -70.060d {-70d 03' 35"} (J2000),
                 -69.983d {-69d 59' 00"} (current),
                 -70.336d {-70d 20' 07"} (1950)
GRB_ERROR:       1.69 [deg radius, statistical only]
DATA_SIGNIF:     33.00 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        16614 TJD;   322 DOY;   13/11/18
GRB_TIME:        82737.47 SOD {22:58:57.47} UT
GRB_PHI:          39.00 [deg]
GRB_THETA:       151.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       234.47d {+15h 37m 53s}  -19.43d {-19d 25' 57"}
SUN_DIST:         80.73 [deg]   Sun_angle= -7.9 [hr] (East of Sun)
MOON_POSTN:       70.56d {+04h 42m 15s}  +19.21d {+19d 12' 38"}
MOON_DIST:       104.03 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      312.78,-45.46 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      309.09,-57.59 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 18 Nov 13 23:00:39 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      126
TRIGGER_NUM:     406508340
GRB_RA:          348.530d {+23h 14m 07s} (J2000),
                 348.752d {+23h 15m 00s} (current),
                 347.723d {+23h 10m 54s} (1950)
GRB_DEC:         -70.890d {-70d 53' 23"} (J2000),
                 -70.814d {-70d 48' 50"} (current),
                 -71.162d {-71d 09' 44"} (1950)
GRB_ERROR:       1.05 [deg radius, statistical only]
DATA_SIGNIF:     34.50 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        16614 TJD;   322 DOY;   13/11/18
GRB_TIME:        82737.47 SOD {22:58:57.47} UT
GRB_PHI:          40.00 [deg]
GRB_THETA:       150.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       234.47d {+15h 37m 53s}  -19.43d {-19d 25' 57"}
SUN_DIST:         79.23 [deg]   Sun_angle= -7.6 [hr] (East of Sun)
MOON_POSTN:       70.57d {+04h 42m 16s}  +19.21d {+19d 12' 40"}
MOON_DIST:       105.46 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      313.76,-44.13 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      306.37,-57.25 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN Circular #15503
Andrew C. Collazzi (NASA/ORAU) reports on behalf of the Fermi GBM Team:
"At 22:58:57.47 UT on 18 November 2013, the Fermi Gamma-ray Burst Monitor= (GBM) triggered and located GRB 131118A (trigger 406508340 / 131118.958). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 349.7, Dec = -69.4 (J2000 degrees, equivalent to J2000 23h 18.8m, -69o 24' ), with a statistical uncertainty of 1.0 degrees (radius, 1-sigma containment, statistical only; there is additionally a systematic error which is currently estimated to be 2 to 3 degrees). The angle from the Fermi LAT boresight is 150 degrees.
Due to the high zenith angle of this burst, there may be higher than normal systematic errors on this location. This burst was also observed by Swif= t-BAT (ground analysis), Suzaku-WAM, and INTEGRAL/SPI-ACS.
The GBM light curve shows a multi-peaked event with a duration (T90) of about 85 s (50-300 keV). The 1.024-s peak flux during this interval is 12.5 +/- 0.9 erg/s/cm^2 (10-1000 keV). The time-averaged spectrum from T0-13.8 to T0+99.8 s is equally well fit to a Comptonized model with Epeak =3D 370.5 +/- 10.6, alpha =3D -0.89 +/- 0.03 and a Band model = with Epeak =3D 366.8 +/- 12.5, alpha =3D -0.89 +/- 0.03, and beta =3D -3.4 +/-= 0.6. Both models yield a fluence (10-1000 keV) in this time interval=20 of (9.2 +/- 0.1)E-05 erg/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #15506
IPN Triangulation of GRB 131118A
K. Hurley, and J. Goldsten, on behalf of the MESSENGER NS GRB team,
S. Golenetskii, R. Aptekar, V. Pal'shin, D. Frederiks, D. Svinkin, and T. Cline on behalf of the Konus-Wind team,
I. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin, on behalf of the HEND-Odyssey GRB team,
W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on behalf of the GRS-Odyssey GRB team,
V. Connaughton, M. S. Briggs, C. Meegan, and V. Pelassa, on behalf of the Fermi GBM team,
A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,
S. Barthelmy, J. Cummings, N. Gehrels, H. Krimm, and D. Palmer, on behalf of the Swift-BAT team,
and
K. Yamaoka, M. Ohno, Y. Hanabata, Y. Fukazawa, T. Takahashi, M. Tashiro, Y. Terada, T. Murakami, and K. Makishima on behalf of the Suzaku WAM team, report:
The long-duration, intense GRB 131118A (Collazzi, GCN 15503) has been observed by Fermi (GBM: trigger 406508340), INTEGRAL (SPI-ACS), Swift (BAT), Suzaku (WAM), MESSENGER (GRNS), Mars Odyssey (HEND), and Konus-Wind, so far, at about 82737 s UT (22:58:57). The burst was outside the coded field of view of the BAT.
We have triangulated it to a 3 sigma error box whose coordinates are:
```
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
   349.863 (23h 19m 27s) -66.833 (-66d 49' 58")
  Corners:
   350.415 (23h 21m 40s) -66.930 (-66d 55' 47")
   349.800 (23h 19m 12s) -66.926 (-66d 55' 32")
   349.313 (23h 17m 15s) -66.733 (-66d 44' 00")
   349.924 (23h 19m 42s) -66.740 (-66d 44' 23")
  ---------------------------------------------
```
The error box area is 162 sq. arcmin, and its maximum dimension is 29 arcmin (the minimum one is 12 arcmin). The Sun distance was 81.6 deg.
The center of the GBM ground position (Collazzi, GCN 15503) is 2.6 deg from the center of the box.
Some improvement in this triangulation is possible.
GCN Circular #15506
S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, report:
The long-duration GRB 131118A (Fermi GBM detection: Collazzi, GCN 15503; IPN triangulation: Hurley at al., GCN 15506) triggered Konus-Wind at T0=82738.919 s UT (22:58:58.919).
The burst light curve shows multiple partly overlapped pulses from ~T0 to ~T0+140 s. The emission is seen up to ~10 MeV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB131118_T82738/ Note: the waiting mode LCs are corrupted for almost whole duration of the burst.
As observed by Konus-Wind, the burst had a fluence of (8.40 � 0.06)x10-5 erg/cm2, and a 64-ms peak flux, measured from T0+63.296 s, of (5.1 � 0.5)x10-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum (measured from T0 to T0+139.520 s) is best fit in the 20 keV - 15 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha = -0.88 � 0.05, the high energy photon index beta = -2.83 � 0.25, the peak energy Ep = 230 � 11 keV, chi2 = 97.4/96 dof.
The spectrum near the maximum count rate (measured from T0+57.600 s to T0+65.792 s) is best fit in the 20 keV - 15 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha = -0.80 � 0.04, the high energy photon index beta = -2.56 � 0.07, the peak energy Ep = 286 � 8 keV, chi2 = 110/97 dof.
All the quoted values are preliminary.

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Jochen Greiner, last update: 21-Nov-2013 [Disclaimer]