Gamma-ray Burst 160829A

(All information courtesy of the instrument teams.)

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Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 29 Aug 16 08:02:02 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      48
TRIGGER_NUM:     494150501
GRB_RA:          188.933d {+12h 35m 44s} (J2000),
                 189.168d {+12h 36m 40s} (current),
                 188.232d {+12h 32m 56s} (1950)
GRB_DEC:         -55.900d {-55d 53' 59"} (J2000),
                 -55.992d {-55d 59' 29"} (current),
                 -55.625d {-55d 37' 28"} (1950)
GRB_ERROR:       7.35 [deg radius, statistical plus systematic]
GRB_INTEN:       323 [cnts/sec]
DATA_SIGNIF:     9.80 [sigma]
INTEG_TIME:      0.256 [sec]
GRB_DATE:        17629 TJD;   242 DOY;   16/08/29
GRB_TIME:        28897.64 SOD {08:01:37.64} UT
GRB_PHI:          75.00 [deg]
GRB_THETA:        20.00 [deg]
DATA_TIME_SCALE: 0.2560 [sec]
HARD_RATIO:      0.25
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       0,1,0, 0,0,0, 0,0,0, 1,0,0, 0,0,
SUN_POSTN:       158.17d {+10h 32m 41s}   +9.16d {+09d 09' 23"}
SUN_DIST:         70.04 [deg]   Sun_angle= -2.1 [hr] (East of Sun)
MOON_POSTN:      121.21d {+08h 04m 51s}  +16.69d {+16d 41' 15"}
MOON_DIST:        92.12 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:      300.72,  6.90 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      216.46,-46.48 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2016/bn160829334/quicklook/glg_lc_medres34_bn160829334.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 88.65,-1.02 [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 29 Aug 16 08:02:15 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     494150501
GRB_RA:          187.300d {+12h 29m 12s} (J2000),
                 187.531d {+12h 30m 08s} (current),
                 186.609d {+12h 26m 26s} (1950)
GRB_DEC:         -56.300d {-56d 17' 59"} (J2000),
                 -56.392d {-56d 23' 30"} (current),
                 -56.024d {-56d 01' 24"} (1950)
GRB_ERROR:       2.51 [deg radius, statistical only]
DATA_SIGNIF:     9.70 [sigma]
DATA_INTERVAL:   0.256 [sec]
GRB_DATE:        17629 TJD;   242 DOY;   16/08/29
GRB_TIME:        28897.64 SOD {08:01:37.64} UT
GRB_PHI:          75.00 [deg]
GRB_THETA:        21.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       158.17d {+10h 32m 41s}   +9.16d {+09d 09' 22"}
SUN_DIST:         69.90 [deg]   Sun_angle= -2.0 [hr] (East of Sun)
MOON_POSTN:      121.22d {+08h 04m 52s}  +16.69d {+16d 41' 14"}
MOON_DIST:        91.50 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:      299.83,  6.44 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      215.71,-47.33 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2016/bn160829334/quicklook/glg_lc_medres34_bn160829334.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_494150501.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
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:     Mon 29 Aug 16 14:54:23 UT
NOTICE_TYPE:     Fermi-LAT Offline Position
TRIGGER_NUM:     494150501     
GRB_RA:          200.891d {+13h 23m 34s} (J2000),
                 201.154d {+13h 24m 37s} (current),
                 200.107d {+13h 20m 26s} (1950)
GRB_DEC:         -55.883d {-55d 52' 58"} (J2000),
                 -55.970d {-55d 58' 09"} (current),
                 -55.622d {-55d 37' 19"} (1950)
GRB_ERROR:       27.00 [arcmin radius, 90% containment, statistical only] 
GRB_DATE:        17629 TJD;   242 DOY;   16/08/29
GRB_TIME:        28897.63 SOD {08:01:37.63} UT
TRIGGER_ID:      0x0
MISC:            0x40000000    
SUN_POSTN:       158.43d {+10h 33m 44s}   +9.05d {+09d 03' 14"}
SUN_DIST:         74.00 [deg]   Sun_angle= -2.8 [hr] (East of Sun)
MOON_POSTN:      125.13d {+08h 20m 32s}  +16.13d {+16d 07' 41"}
MOON_DIST:        95.76 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:      307.46,  6.71 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      224.38,-42.85 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi LAT Offline position.
COMMENTS:        This Notice was ground-generated -- not flight-generated.
COMMENTS:        It is the result of human-in-the-loop processing.
COMMENTS:        This is a human generated position of a LAT ground detection.
COMMENTS:        This source corresponds to GBM trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 29 Aug 16 17:25:37 UT
NOTICE_TYPE:     Fermi-LAT Offline Position
TRIGGER_NUM:     494150501     
GRB_RA:          200.891d {+13h 23m 34s} (J2000),
                 201.154d {+13h 24m 37s} (current),
                 200.107d {+13h 20m 26s} (1950)
GRB_DEC:         -55.883d {-55d 52' 58"} (J2000),
                 -55.970d {-55d 58' 09"} (current),
                 -55.622d {-55d 37' 19"} (1950)
GRB_ERROR:       27.00 [arcmin radius, 90% containment, statistical only] 
GRB_DATE:        17629 TJD;   242 DOY;   16/08/29
GRB_TIME:        28897.63 SOD {08:01:37.63} UT
TRIGGER_ID:      0x0
MISC:            0x40000000    
SUN_POSTN:       158.53d {+10h 34m 07s}   +9.02d {+09d 00' 59"}
SUN_DIST:         73.93 [deg]   Sun_angle= -2.8 [hr] (East of Sun)
MOON_POSTN:      126.56d {+08h 26m 15s}  +15.91d {+15d 54' 20"}
MOON_DIST:        94.83 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:      307.46,  6.71 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      224.38,-42.85 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi LAT Offline position.
COMMENTS:        This Notice was ground-generated -- not flight-generated.
COMMENTS:        It is the result of human-in-the-loop processing.
COMMENTS:        This is a human generated position of a LAT ground detection.
COMMENTS:        This source corresponds to GBM trigger.

GCN Circular #19879
J. L. Racusin (NASA/GSFC), G. Vianello (Stanford), D. Kocevski (NASA/GSFC), E. Bissaldi (Politecnico & INFN Bari), and R. Desiante (INFN Torino) report on behalf of the Fermi-LAT team: At 08:01:37 on August 29, 2016 Fermi-LAT detected high-energy emission from GRB 160829A, which was also detected by Fermi-GBM (trigger 494150501/160829334). The best LAT on-ground location is found to be
RA, Dec = 201.7, -56.77 (degrees, J2000)
with an error radius of 0.12 deg (90% containment, statistical error only). This was 11 deg from the LAT boresight at the time of the trigger. The data from the Fermi-LAT show an increase in the event rate within 10 deg of the GBM location after the GBM trigger that is spatially and temporally correlated with the GBM emission. The highest-energy photon is a 9.5 GeV event which is observed ~2 seconds after the GBM trigger, and the GRB is otherwise relatively faint, with only 3 photons (>100 MeV) with a >90% probability of being associated with the burst. A Swift ToO has been requested for this burst. The Fermi-LAT point of contact for this burst is Judith Racusin (judith.racusin@nasa.gov). 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 #19880
P. A. Evans (U. Leicester) reports on behalf of the Swift team:
Swift has initiated a ToO observation of the Fermi/LAT GRB 160829A. Automated analysis of the XRT data will be presented online at http://www.swift.ac.uk/ToO_GRBs/00020687
Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. These are not necessarily related to the Fermi/LAT event. Any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration.
Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).
Thiis circular is an official product of the Swift-XRT team.
GCN Circular #19882
R. Hamburg (UAH), C. Meegan (UAH), and O. Roberts (UCD) report on behalf of the Fermi GBM Team:
"At 08:01:37.64 UT on 29 August 2016, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 160829 (trigger 494150501 / 160829334), which was also detected by the LAT (Racusin et al. 2016, GCN 19879).
The GBM light curve consists of two short peaks with a duration (T90) of about 0.5 s (50-300 keV). The time-averaged spectrum from T0-0.06 s to T0+0.38 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.56 +/- 0.24 and the cutoff energy, parameterized as Epeak, is 771.40 +/- 282.00 keV
The event fluence (10-1000 keV) in this time interval is (5.12 +/- 0.49)E-07 erg/cm^2. The 0.064-sec peak photon flux measured starting from T0+0.00 s in the 10-1000 keV band is 5.3 +/- 0.9 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #19883
A. Maselli (INAF-IASFPA), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), T.G.R. Roegiers (PSU), S.L. Gibson (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team:
Swift-XRT has performed follow-up observations of the Fermi/LAT-detected burst GRB 160829A (Racusin et al. GCN Circ. 19879), collecting 4.8 ks of Photon Counting (PC) mode data between T0+37.4 ks and T0+61.4 ks.
No X-ray source has been detected within the LAT error region (Racusin et al. GCN Circ. 19879), with a 3 sigma upper limit count rate of 2.6e-3 ct/s (0.3-10keV).
An uncatalogued X-ray source was detected 13.3 arcmin from the LAT position at a count rate of (4.9 +/- 1.9)e-3 ct/s. This source is identified by SIMBAD as CD-56 4975 at RA, Dec (J2000) = 13h 28m 03.68s, -56d 54m 30.38s, whose colours are suggestive of a late-type star, which is, therefore, unlikely to be related to the LAT burst.
The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at http://www.swift.ac.uk/ToO_GRBs/00020687.
This circular is an official product of the Swift-XRT team.

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Jochen Greiner, last update: 30-Aug-2016 [Disclaimer]