Gamma-ray Burst 160314

(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 14 Mar 16 22:18:18 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      39
TRIGGER_NUM:     479686677
GRB_RA:          157.800d {+10h 31m 12s} (J2000),
                 158.033d {+10h 32m 08s} (current),
                 157.079d {+10h 28m 19s} (1950)
GRB_DEC:         +36.817d {+36d 49' 00"} (J2000),
                 +36.733d {+36d 43' 59"} (current),
                 +37.074d {+37d 04' 26"} (1950)
GRB_ERROR:       18.10 [deg radius, statistical plus systematic]
GRB_INTEN:       73 [cnts/sec]
DATA_SIGNIF:     5.50 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        17461 TJD;    74 DOY;   16/03/14
GRB_TIME:        80273.73 SOD {22:17:53.73} UT
GRB_PHI:          20.00 [deg]
GRB_THETA:        15.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.41
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      68%  GRB
2nd_MOST_LIKELY:  28%  Distant Particles
DETECTORS:       1,0,0, 1,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       355.20d {+23h 40m 47s}   -2.08d {-02d 04' 41"}
SUN_DIST:        141.90 [deg]   Sun_angle= -10.9 [hr] (East of Sun)
MOON_POSTN:       74.09d {+04h 56m 22s}  +17.35d {+17d 20' 57"}
MOON_DIST:        74.98 [deg]
MOON_ILLUM:      41 [%]
GAL_COORDS:      185.91, 58.92 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      145.16, 25.43 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2016/bn160314929/quicklook/glg_lc_medres34_bn160314929.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 27.02,-24.57 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 14 Mar 16 22:18:31 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      48
TRIGGER_NUM:     479686677
GRB_RA:          171.850d {+11h 27m 24s} (J2000),
                 172.069d {+11h 28m 17s} (current),
                 171.171d {+11h 24m 41s} (1950)
GRB_DEC:         +42.990d {+42d 59' 24"} (J2000),
                 +42.901d {+42d 54' 02"} (current),
                 +43.265d {+43d 15' 55"} (1950)
GRB_ERROR:       4.26 [deg radius, statistical only]
DATA_SIGNIF:     8.90 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        17461 TJD;    74 DOY;   16/03/14
GRB_TIME:        80273.73 SOD {22:17:53.73} UT
GRB_PHI:         337.00 [deg]
GRB_THETA:        18.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       355.20d {+23h 40m 47s}   -2.08d {-02d 04' 41"}
SUN_DIST:        139.08 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       74.10d {+04h 56m 23s}  +17.35d {+17d 20' 58"}
MOON_DIST:        83.92 [deg]
MOON_ILLUM:      41 [%]
GAL_COORDS:      164.52, 66.73 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      153.16, 35.76 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2016/bn160314929/quicklook/glg_lc_medres34_bn160314929.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_479686677.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 ~4 min after the notice.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 14 Mar 16 22:18:35 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      58
TRIGGER_NUM:     479686677
GRB_RA:          169.400d {+11h 17m 36s} (J2000),
                 169.624d {+11h 18m 30s} (current),
                 168.706d {+11h 14m 49s} (1950)
GRB_DEC:         +45.200d {+45d 12' 00"} (J2000),
                 +45.111d {+45d 06' 41"} (current),
                 +45.473d {+45d 28' 24"} (1950)
GRB_ERROR:       16.82 [deg radius, statistical plus systematic]
GRB_INTEN:       95 [cnts/sec]
DATA_SIGNIF:     8.10 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        17461 TJD;    74 DOY;   16/03/14
GRB_TIME:        80273.73 SOD {22:17:53.73} UT
GRB_PHI:         345.00 [deg]
GRB_THETA:        20.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.60
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      67%  GRB
2nd_MOST_LIKELY:  30%  Distant Particles
DETECTORS:       1,0,0, 1,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       355.20d {+23h 40m 47s}   -2.08d {-02d 04' 41"}
SUN_DIST:        136.69 [deg]   Sun_angle= -11.6 [hr] (East of Sun)
MOON_POSTN:       74.10d {+04h 56m 23s}  +17.35d {+17d 20' 58"}
MOON_DIST:        81.58 [deg]
MOON_ILLUM:      41 [%]
GAL_COORDS:      162.72, 64.01 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      149.92, 36.83 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2016/bn160314929/quicklook/glg_lc_medres34_bn160314929.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 27.02,-24.57 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 14 Mar 16 22:19:45 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      0
TRIGGER_NUM:     479686677
GRB_RA:          164.390d {+10h 57m 34s} (J2000),
                 164.621d {+10h 58m 29s} (current),
                 163.673d {+10h 54m 42s} (1950)
GRB_DEC:         +44.810d {+44d 48' 36"} (J2000),
                 +44.723d {+44d 43' 23"} (current),
                 +45.078d {+45d 04' 40"} (1950)
GRB_ERROR:       2.10 [deg radius, statistical only]
DATA_SIGNIF:     16.00 [sigma]
DATA_INTERVAL:   14.336 [sec]
GRB_DATE:        17461 TJD;    74 DOY;   16/03/14
GRB_TIME:        80273.73 SOD {22:17:53.73} UT
GRB_PHI:         354.00 [deg]
GRB_THETA:        20.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       355.20d {+23h 40m 48s}   -2.08d {-02d 04' 39"}
SUN_DIST:        136.34 [deg]   Sun_angle= -11.3 [hr] (East of Sun)
MOON_POSTN:       74.11d {+04h 56m 26s}  +17.35d {+17d 21' 02"}
MOON_DIST:        78.24 [deg]
MOON_ILLUM:      41 [%]
GAL_COORDS:      167.54, 61.21 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      146.31, 34.80 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2016/bn160314929/quicklook/glg_lc_medres34_bn160314929.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_479686677.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 ~4 min after the notice.

GCN Circular #19197
G. Vianello (Stanford), J. Racusin (NASA/GSFC), D. Kocevski (NASA/GSFC), F. Longo (University of Trieste and INFN), and B. Ahlgren (KTH), report on behalf of the Fermi-LAT team:
At 22:17:53.73 on March 14, 2016 Fermi-LAT detected high-energy emission from GRB 160314B, which was also detected by Fermi-GBM (trigger 479686676 / 160314929).
The best LAT on-ground location is found to be: RA, Dec (J2000) = 167.56, 45.67 with an error radius of 0.65 deg (90 % containment, statistical error only).
Unfortunately, the LAT was not taking data at the trigger time T0, because Fermi was just exiting the South Atlantic Anomaly (SAA). Note that LAT and GBM have slightly different SAA definitions in onboard software. However, LAT resumed data taking ~30 seconds after T0, and the GRB was 21 deg from the LAT boresight at that time.
The LAT data show a significant increase in the event rate that is spatially and temporally correlated with the trigger with high significance. The highest-energy photon is a 900 MeV event which is observed ~630 seconds after the GBM trigger.
The Fermi-LAT point of contact for this burst is B. Ahlgren (bjornah@kth.se).
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 #19198
C. M. Hui (NASA/MSFC) report on behalf of the Fermi GBM Team:
At 22:17:53.73 UT on 14 March 2016, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 160314B (trigger 479686677 / 160314929), which was also detected by the LAT (G. Vianello et al., GCN 19197). GBM triggered on this GRB ~70s after exiting the SAA. The GBM on-ground location is consistent with the LAT position.
The angle from the Fermi LAT boresight at the GBM trigger time is 21 degrees.
The GBM light curve shows two peaks with a duration (T90) of about 100 s (50-300 keV). The time-averaged spectrum from T0-5.6 s to T0+18.9 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.19 +/- 0.05 and the cutoff energy, parameterized as Epeak, is 954.5 +/- 274.0 keV.
The event fluence (10-1000 keV) in this time interval is (8.98 +/- 0.34)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+8.4 s in the 8-1000 keV band is 3.25 +/- 0.24 ph/s/cm^2.
A Band function fits the spectrum equally well with Epeak = 848.9 +/- 368.0 keV, alpha = -1.20 +/- 0.06, and beta = -1.86 +/- 0.22.
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: 16-Mar-2016 [Disclaimer]