Gamma-ray Burst 140810A

(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:     Sun 10 Aug 14 18:46:54 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     429389173
GRB_RA:          131.267d {+08h 45m 04s} (J2000),
                 131.494d {+08h 45m 59s} (current),
                 130.486d {+08h 41m 57s} (1950)
GRB_DEC:         +33.633d {+33d 37' 60"} (J2000),
                 +33.580d {+33d 34' 46"} (current),
                 +33.815d {+33d 48' 56"} (1950)
GRB_ERROR:       24.13 [deg radius, statistical plus systematic]
GRB_INTEN:       134 [cnts/sec]
DATA_SIGNIF:     5.90 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        16879 TJD;   222 DOY;   14/08/10
GRB_TIME:        67570.09 SOD {18:46:10.09} UT
GRB_PHI:          28.98 [deg]
GRB_THETA:       135.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.47
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      93%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,0,1, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       140.50d {+09h 22m 00s}  +15.42d {+15d 24' 57"}
SUN_DIST:         19.90 [deg]   Sun_angle= 0.6 [hr] (West of Sun)
MOON_POSTN:      319.31d {+21h 17m 14s}  -11.09d {-11d 05' 30"}
MOON_DIST:       156.40 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      189.83, 37.23 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      124.65, 15.02 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn140810782/quicklook/glg_lc_medres34_bn140810782.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 140.12,17.57 [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 10 Aug 14 18:46:58 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      58
TRIGGER_NUM:     429389173
GRB_RA:          138.167d {+09h 12m 40s} (J2000),
                 138.386d {+09h 13m 33s} (current),
                 137.415d {+09h 09m 40s} (1950)
GRB_DEC:         +30.700d {+30d 41' 60"} (J2000),
                 +30.639d {+30d 38' 21"} (current),
                 +30.906d {+30d 54' 22"} (1950)
GRB_ERROR:       7.82 [deg radius, statistical plus systematic]
GRB_INTEN:       409 [cnts/sec]
DATA_SIGNIF:     23.20 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        16879 TJD;   222 DOY;   14/08/10
GRB_TIME:        67570.09 SOD {18:46:10.09} UT
GRB_PHI:          23.00 [deg]
GRB_THETA:       140.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.66
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,0,1, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       140.50d {+09h 22m 00s}  +15.42d {+15d 24' 57"}
SUN_DIST:         15.35 [deg]   Sun_angle= 0.1 [hr] (West of Sun)
MOON_POSTN:      319.31d {+21h 17m 14s}  -11.09d {-11d 05' 29"}
MOON_DIST:       160.43 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      194.95, 42.46 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      131.30, 13.90 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn140810782/quicklook/glg_lc_medres34_bn140810782.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 140.12,17.57 [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 10 Aug 14 18:47:02 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      69
TRIGGER_NUM:     429389173
GRB_RA:          117.983d {+07h 51m 56s} (J2000),
                 118.226d {+07h 52m 54s} (current),
                 117.151d {+07h 48m 36s} (1950)
GRB_DEC:         +37.783d {+37d 46' 60"} (J2000),
                 +37.745d {+37d 44' 42"} (current),
                 +37.912d {+37d 54' 44"} (1950)
GRB_ERROR:       6.02 [deg radius, statistical plus systematic]
GRB_INTEN:       599 [cnts/sec]
DATA_SIGNIF:     44.20 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        16879 TJD;   222 DOY;   14/08/10
GRB_TIME:        67570.09 SOD {18:46:10.09} UT
GRB_PHI:          37.00 [deg]
GRB_THETA:       125.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.57
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,0,1, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       140.50d {+09h 22m 00s}  +15.42d {+15d 24' 57"}
SUN_DIST:         29.76 [deg]   Sun_angle= 1.5 [hr] (West of Sun)
MOON_POSTN:      319.31d {+21h 17m 15s}  -11.09d {-11d 05' 29"}
MOON_DIST:       147.33 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      182.33, 27.57 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      112.76, 16.53 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn140810782/quicklook/glg_lc_medres34_bn140810782.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 140.12,17.57 [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 10 Aug 14 18:47:05 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      73
TRIGGER_NUM:     429389173
GRB_RA:          144.367d {+09h 37m 28s} (J2000),
                 144.585d {+09h 38m 20s} (current),
                 143.617d {+09h 34m 28s} (1950)
GRB_DEC:         +33.633d {+33d 37' 60"} (J2000),
                 +33.567d {+33d 34' 02"} (current),
                 +33.859d {+33d 51' 31"} (1950)
GRB_ERROR:       3.82 [deg radius, statistical plus systematic]
GRB_INTEN:       1843 [cnts/sec]
DATA_SIGNIF:     65.30 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        16879 TJD;   222 DOY;   14/08/10
GRB_TIME:        67570.09 SOD {18:46:10.09} UT
GRB_PHI:          26.00 [deg]
GRB_THETA:       145.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.43
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,0,1, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       140.50d {+09h 22m 00s}  +15.42d {+15d 24' 57"}
SUN_DIST:         18.52 [deg]   Sun_angle= -0.3 [hr] (East of Sun)
MOON_POSTN:      319.31d {+21h 17m 15s}  -11.09d {-11d 05' 28"}
MOON_DIST:       157.01 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      191.77, 48.04 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      135.48, 18.37 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn140810782/quicklook/glg_lc_medres34_bn140810782.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 140.12,17.57 [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 10 Aug 14 18:47:08 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     429389173
GRB_RA:          109.760d {+07h 19m 02s} (J2000),
                 109.985d {+07h 19m 56s} (current),
                 108.989d {+07h 15m 57s} (1950)
GRB_DEC:         +26.330d {+26d 19' 48"} (J2000),
                 +26.302d {+26d 18' 08"} (current),
                 +26.422d {+26d 25' 20"} (1950)
GRB_ERROR:       8.39 [deg radius, statistical only]
DATA_SIGNIF:     11.40 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        16879 TJD;   222 DOY;   14/08/10
GRB_TIME:        67570.09 SOD {18:46:10.09} UT
GRB_PHI:          27.00 [deg]
GRB_THETA:       115.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       140.50d {+09h 22m 00s}  +15.42d {+15d 24' 57"}
SUN_DIST:         30.42 [deg]   Sun_angle= 2.0 [hr] (West of Sun)
MOON_POSTN:      319.31d {+21h 17m 15s}  -11.09d {-11d 05' 28"}
MOON_DIST:       148.45 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      191.70, 17.34 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      107.68,  4.10 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn140810782/quicklook/glg_lc_medres34_bn140810782.gif
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 10 Aug 14 18:47:12 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      93
TRIGGER_NUM:     429389173
GRB_RA:          132.200d {+08h 48m 48s} (J2000),
                 132.428d {+08h 49m 43s} (current),
                 131.418d {+08h 45m 40s} (1950)
GRB_DEC:         +34.150d {+34d 08' 60"} (J2000),
                 +34.095d {+34d 05' 43"} (current),
                 +34.336d {+34d 20' 08"} (1950)
GRB_ERROR:       3.88 [deg radius, statistical plus systematic]
GRB_INTEN:       1636 [cnts/sec]
DATA_SIGNIF:     101.80 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        16879 TJD;   222 DOY;   14/08/10
GRB_TIME:        67570.09 SOD {18:46:10.09} UT
GRB_PHI:          28.98 [deg]
GRB_THETA:       135.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.45
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,0,1, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       140.50d {+09h 22m 00s}  +15.42d {+15d 24' 57"}
SUN_DIST:         20.05 [deg]   Sun_angle= 0.5 [hr] (West of Sun)
MOON_POSTN:      319.31d {+21h 17m 15s}  -11.09d {-11d 05' 27"}
MOON_DIST:       156.15 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      189.36, 38.09 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      125.28, 15.73 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn140810782/quicklook/glg_lc_medres34_bn140810782.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 140.12,17.57 [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 10 Aug 14 18:47:24 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      71
TRIGGER_NUM:     429389173
GRB_RA:          116.610d {+07h 46m 26s} (J2000),
                 116.835d {+07h 47m 21s} (current),
                 115.837d {+07h 43m 21s} (1950)
GRB_DEC:         +27.800d {+27d 48' 00"} (J2000),
                 +27.763d {+27d 45' 48"} (current),
                 +27.923d {+27d 55' 23"} (1950)
GRB_ERROR:       2.17 [deg radius, statistical only]
DATA_SIGNIF:     45.60 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        16879 TJD;   222 DOY;   14/08/10
GRB_TIME:        67570.09 SOD {18:46:10.09} UT
GRB_PHI:          26.00 [deg]
GRB_THETA:       121.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       140.50d {+09h 22m 00s}  +15.42d {+15d 24' 57"}
SUN_DIST:         25.16 [deg]   Sun_angle= 1.6 [hr] (West of Sun)
MOON_POSTN:      319.31d {+21h 17m 16s}  -11.09d {-11d 05' 25"}
MOON_DIST:       153.12 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      192.55, 23.57 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      113.50,  6.51 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn140810782/quicklook/glg_lc_medres34_bn140810782.gif
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 10 Aug 14 18:47:45 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      92
TRIGGER_NUM:     429389173
GRB_RA:          119.590d {+07h 58m 22s} (J2000),
                 119.810d {+07h 59m 15s} (current),
                 118.834d {+07h 55m 20s} (1950)
GRB_DEC:         +25.270d {+25d 16' 12"} (J2000),
                 +25.230d {+25d 13' 47"} (current),
                 +25.406d {+25d 24' 21"} (1950)
GRB_ERROR:       1.50 [deg radius, statistical only]
DATA_SIGNIF:     112.50 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        16879 TJD;   222 DOY;   14/08/10
GRB_TIME:        67570.09 SOD {18:46:10.09} UT
GRB_PHI:          22.00 [deg]
GRB_THETA:       122.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       140.50d {+09h 22m 00s}  +15.42d {+15d 24' 57"}
SUN_DIST:         21.70 [deg]   Sun_angle= 1.4 [hr] (West of Sun)
MOON_POSTN:      319.32d {+21h 17m 16s}  -11.09d {-11d 05' 21"}
MOON_DIST:       156.74 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      196.15, 25.24 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      116.61,  4.52 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn140810782/quicklook/glg_lc_medres34_bn140810782.gif
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        Bright hard burst in the GBM.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 10 Aug 14 18:48:04 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      95
TRIGGER_NUM:     429389173
GRB_RA:          118.210d {+07h 52m 50s} (J2000),
                 118.430d {+07h 53m 43s} (current),
                 117.455d {+07h 49m 49s} (1950)
GRB_DEC:         +24.860d {+24d 51' 36"} (J2000),
                 +24.821d {+24d 49' 17"} (current),
                 +24.990d {+24d 59' 24"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
DATA_SIGNIF:     128.20 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        16879 TJD;   222 DOY;   14/08/10
GRB_TIME:        67570.09 SOD {18:46:10.09} UT
GRB_PHI:          22.00 [deg]
GRB_THETA:       120.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       140.50d {+09h 22m 00s}  +15.42d {+15d 24' 57"}
SUN_DIST:         22.72 [deg]   Sun_angle= 1.5 [hr] (West of Sun)
MOON_POSTN:      319.32d {+21h 17m 17s}  -11.09d {-11d 05' 18"}
MOON_DIST:       155.90 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      196.10, 23.92 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      115.46,  3.88 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn140810782/quicklook/glg_lc_medres34_bn140810782.gif
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN Circular #16678
Elena Moretti (MPI Munich), Makoto Arimoto (Tokyo Tech), Elisabetta Bissaldi (University & INFN Trieste), Sylvain Guiriec (GSFC/CRESST/UMD) and Giacomo Vianello (Stanford University) report on behalf of the Fermi-LAT team:
At UT 18:46:10.09 on August 10th, 2014, Fermi-LAT detected high-energy emission from GRB 140810A, which was also detected by Fermi-GBM (trigger 140810782/429389173).
The best LAT on-ground location is found to be
(RA, Dec) = 119.04, 27.55 (deg, J2000)
with an approximate error radius of 0.12 deg (90% containment, statistical error only). The error circle is slightly asymmetric, the Test Statistic localisation map (with 68% and 90% contours) can be found here: http://fermigrb.stanford.edu/140810782.jpg. The location could be updated later as more data become available (at the moment of writing we can analyse up to 2000 s after the trigger). The burst was 123 deg from the LAT boresight at the time of the trigger and the high fluence detected by GBM caused the GBM flight software to initiate a Fermi autonomous re-point that placed the source in the LAT FoV about 330 s after the trigger.
The data from the Fermi-LAT show a significant increase in the event rate that is spatially correlated with the GBM emission with high significance. More than 20 photons above 100 MeV and 3 photons above 1 GeV are observed. The highest-energy photon is a 16 GeV event, which is observed about 1500 s after the GBM trigger.
A Swift ToO has been requested for this burst, but the burst can not be observed due to Sun constrains.
The Fermi-LAT point of contact for this burst is Elena Moretti (moretti@mpp.mpg.de)
The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.
GCN Circular #16679
S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A.Lysenko, and T. Cline on behalf of the Konus-Wind team, report:
The long-duration GRB 140810A (Fermi-LAT detection: Moretti et al., GCN 16678) triggered Konus-Wind at T0=67571.433 s UT (18:46:11.433).
The light curve shows a multi-peaked structure with a total duration of ~100 s. The emission is seen up to 10 MeV.
As observed by Konus-Wind, the burst had a fluence of 1.5(-0.1,+0.1)x10^-4 erg/cm2, and a 64-ms peak flux, measured from T0+23.104 s, of 1.3(-0.1,+0.1)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum (measured from T0 to T0+93.696 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 = -1.05 (-0.06,+0.05), the high energy photon index beta = -2.35 (-0.16,+0.12), the peak energy Ep = 239 (-26,+25) keV, chi2 = 105/97 dof.
The spectrum near the peak count rate (measured from T0+16.640 to T0+29.959 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 = -0.86 (-0.10,+0.10), the high energy photon index beta = -2.44 (-0.35,+0.17), the peak energy Ep = 416 (-47,+63) keV, chi2 = 87/97 dof.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB140810_T67571/
All the quoted errors are at the 90% sigma confidence level. All the quoted values are preliminary.
GCN Circular #16680
Oliver Roberts (UCD) and Matthew Stanbro (UAH) report on behalf of the Fermi GBM Team:
"At 18:46:10.09 UT on the 10th of August 2014, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 140810A (trigger 429389173 / 140810782), which was also detected by the LAT (Bissaldi et al. 2014, GCN 16678). The trigger resulted in an Autonomous Repoint Request (ARR) that was accepted. The GBM on-ground location is consistent with the LAT position.
The angle from the Fermi LAT boresight is 122 degrees.
The GBM light curve consists of multiple peaks with a duration (T90) of about 82 s (50-300 keV). The time-averaged spectrum from T0-3.58 s to T0+107.01 s is well fit by a power law function with an exponential high-energy cutoff. The power law index is -1.01 +/- 0.01 and the cutoff energy, parameterised as Epeak, is 302 +/- 7 keV.
The event fluence (10-1000 keV) in this time interval is (110.42 +/- 0.07)E-06 erg/cm^2. The 1.024-sec peak photon flux measured from T0+6.6 s in the 10-1000 keV band, is 35.98+/-0.65 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #16683
K. Hurley, on behalf of the IPN,
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,
S. Golenetskii, R. Aptekar, V. Pal'shin, D. Frederiks, D. Svinkin, and T. Cline on behalf of the Konus-Wind team,
J. Goldsten, on behalf of the MESSENGER NS GRB team,
A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, and
V. Connaughton, M. S. Briggs, C. Meegan, and V. Pelassa, on behalf of the Fermi GBM team, report:
GRB 140810A (Moretti et al. GCN 16678, Golenetskii et al. GCN 16679, Roberts et al. GCN 16680) has been observed by Odyssey-HEND, MESSENGER GRNS, Konus-Wind, INTEGRAL SPI-ACS, and Fermi GBM and LAT, so far. We have triangulated it to a preliminary, 3 sigma error box whose coordinates are:
```
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
   119.056 (07h 56m 13s) +27.413 (+27d 24' 47")
  Corners:
   119.076 (07h 56m 18s) +28.016 (+28d 00' 58")
   119.014 (07h 56m 04s) +26.723 (+26d 43' 23")
   119.470 (07h 57m 53s) +28.814 (+28d 48' 49")
   118.462 (07h 53m 51s) +25.183 (+25d 10' 57")
  ---------------------------------------------
```
The error box area is 1450 sq. arcmin., and its maximum/minimum dimensions are 3.74/0.096 deg.
This error box is consistent with the Fermi-LAT 90% confidence, statistical-only error circle (GCN 16678), and constrains it slightly. A map has been posted at ssl.berkeley.edu/ipn3/140810A. This localization may be improved.

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Jochen Greiner, last update: 04-Sep-2014 [Disclaimer]