Gamma-ray Burst 190810A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 10 Aug 19 16:12:28 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      46
TRIGGER_NUM:     587146326
GRB_RA:          226.017d {+15h 04m 04s} (J2000),
                 226.590d {+15h 06m 22s} (current),
                 224.577d {+14h 58m 18s} (1950)
GRB_DEC:         -76.200d {-76d 12' 00"} (J2000),
                 -76.275d {-76d 16' 30"} (current),
                 -76.004d {-76d 00' 14"} (1950)
GRB_ERROR:       6.32 [deg radius, statistical plus systematic]
GRB_INTEN:       730 [cnts/sec]
DATA_SIGNIF:     16.30 [sigma]
INTEG_TIME:      0.128 [sec]
GRB_DATE:        18705 TJD;   222 DOY;   19/08/10
GRB_TIME:        58321.24 SOD {16:12:01.24} UT
GRB_PHI:          60.00 [deg]
GRB_THETA:       155.00 [deg]
DATA_TIME_SCALE: 0.1280 [sec]
HARD_RATIO:      0.02
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      87%  GRB
2nd_MOST_LIKELY:  11%  Distant Particles
DETECTORS:       0,1,1, 1,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       140.20d {+09h 20m 48s}  +15.51d {+15d 30' 30"}
SUN_DIST:        104.20 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      263.03d {+17h 32m 07s}  -21.11d {-21d 06' 49"}
MOON_DIST:        58.13 [deg]
MOON_ILLUM:      79 [%]
GAL_COORDS:      310.71,-15.37 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      253.06,-55.36 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190810675/quicklook/glg_lc_medres34_bn190810675.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 317.83,25.52 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 10 Aug 19 16:12:40 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     587146326
GRB_RA:          192.770d {+12h 51m 05s} (J2000),
                 193.041d {+12h 52m 10s} (current),
                 192.082d {+12h 48m 20s} (1950)
GRB_DEC:         -38.660d {-38d 39' 35"} (J2000),
                 -38.766d {-38d 45' 58"} (current),
                 -38.388d {-38d 23' 16"} (1950)
GRB_ERROR:       12.14 [deg radius, statistical only]
DATA_SIGNIF:     19.60 [sigma]
DATA_INTERVAL:   0.128 [sec]
GRB_DATE:        18705 TJD;   222 DOY;   19/08/10
GRB_TIME:        58321.24 SOD {16:12:01.24} UT
GRB_PHI:          52.00 [deg]
GRB_THETA:       115.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       140.20d {+09h 20m 48s}  +15.51d {+15d 30' 29"}
SUN_DIST:         73.36 [deg]   Sun_angle= -3.5 [hr] (East of Sun)
MOON_POSTN:      263.03d {+17h 32m 07s}  -21.11d {-21d 06' 50"}
MOON_DIST:        61.68 [deg]
MOON_ILLUM:      79 [%]
GAL_COORDS:      302.86, 24.21 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      208.11,-30.30 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190810675/quicklook/glg_lc_medres34_bn190810675.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_587146326.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:     Sat 10 Aug 19 16:13:50 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      0
TRIGGER_NUM:     587146326
GRB_RA:          196.870d {+13h 07m 29s} (J2000),
                 197.144d {+13h 08m 35s} (current),
                 196.174d {+13h 04m 42s} (1950)
GRB_DEC:         -35.250d {-35d 15' 00"} (J2000),
                 -35.354d {-35d 21' 15"} (current),
                 -34.983d {-34d 58' 58"} (1950)
GRB_ERROR:       5.85 [deg radius, statistical only]
DATA_SIGNIF:     11.40 [sigma]
DATA_INTERVAL:   1.024 [sec]
GRB_DATE:        18705 TJD;   222 DOY;   19/08/10
GRB_TIME:        58321.24 SOD {16:12:01.24} UT
GRB_PHI:          56.00 [deg]
GRB_THETA:       112.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       140.20d {+09h 20m 49s}  +15.51d {+15d 30' 29"}
SUN_DIST:         74.10 [deg]   Sun_angle= -3.8 [hr] (East of Sun)
MOON_POSTN:      263.04d {+17h 32m 10s}  -21.12d {-21d 06' 55"}
MOON_DIST:        58.72 [deg]
MOON_ILLUM:      79 [%]
GAL_COORDS:      306.62, 27.51 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      209.77,-25.80 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190810675/quicklook/glg_lc_medres34_bn190810675.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_587146326.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(0.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=8348).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 10 Aug 19 16:21:19 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     587146326
GRB_RA:          192.780d {+12h 51m 07s} (J2000),
                 193.051d {+12h 52m 12s} (current),
                 192.092d {+12h 48m 22s} (1950)
GRB_DEC:         -38.660d {-38d 39' 35"} (J2000),
                 -38.766d {-38d 45' 58"} (current),
                 -38.388d {-38d 23' 16"} (1950)
GRB_ERROR:       16.95 [deg radius, statistical only]
GRB_DATE:        18705 TJD;   222 DOY;   19/08/10
GRB_TIME:        58321.24 SOD {16:12:01.24} UT
GRB_PHI:          52.00 [deg]
GRB_THETA:       115.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       140.21d {+09h 20m 50s}  +15.51d {+15d 30' 23"}
SUN_DIST:         73.36 [deg]   Sun_angle= -3.5 [hr] (East of Sun)
MOON_POSTN:      263.11d {+17h 32m 26s}  -21.12d {-21d 07' 27"}
MOON_DIST:        61.73 [deg]
MOON_ILLUM:      79 [%]
GAL_COORDS:      302.86, 24.21 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      208.12,-30.29 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190810675/quicklook/glg_lc_medres34_bn190810675.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190810675/quicklook/glg_locplot_all_bn190810675.png
COMMENTS:        Fermi-GBM Final Position.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file should be available by the time this FINAL notice is produced.  
COMMENTS:        This notice was generated completely by automated pipeline processing.  
COMMENTS:        This is likely a Short GRB.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=8348).

GCN Circular #25310
The Fermi GBM team reports the detection of a likely SHORT GRB
At 16:12:01 UT on 10 Aug 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 190810A (trigger 587146326.24257 / 190810675).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 192.8, Dec = -38.7 (J2000 degrees, equivalent to J2000 12h 51m, -38d 42'), with a statistical uncertainty of 17.0 degrees.
The angle from the Fermi LAT boresight is 115.0 degrees.
The skymap can be found here: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190810675/quicklook/glg_skymap_all_bn190810675.png
The HEALPix FITS file, including the estimated localization systematic, can be found here: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190810675/quicklook/glg_healpix_all_bn190810675.fit
The GBM light curve can be found here: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190810675/quicklook/glg_lc_medres34_bn190810675.gif
GCN Circular #25312
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,
D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Kozlova, and T. Cline on behalf of the Konus-Wind team,
A. Goldstein, M. S. Briggs, and C. Wilson-Hodge 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, H. Krimm, and D. Palmer, on behalf of the Swift-BAT team, and
W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on behalf of the GRS-Odyssey GRB team, report:
The short-duration GRB 190810A (The Fermi-GBM team, GCN 25310) was detected by Fermi (GBM trigger 587146326), INTEGRAL (SPI-ACS), Mars-Odyssey (HEND), Konus-Wind, and Swift (BAT), at about 58321 s UT (16:12:01). The burst was outside the coded field of view of the BAT.
We have triangulated it to a preliminary, 3 sigma error box whose coordinates are:
```
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
   192.049 (12h 48m 12s) -28.504 (-28d 30' 16")
  Corners:
   190.529 (12h 42m 07s) -30.184 (-30d 11' 02")
   193.578 (12h 54m 19s) -26.862 (-26d 51' 42")
   193.486 (12h 53m 57s) -26.776 (-26d 46' 34")
   190.437 (12h 41m 45s) -30.097 (-30d 05' 48")
  ---------------------------------------------
```
The error box area is about 1804 sq. arcmin, and its maximum dimension is 4.28 deg (the minimum one is 7.0 arcmin). The Sun distance was 66 deg.
This box may be improved.
The IPN localization is consistent with, but reduces the area of, the Fermi-GBM one.
A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB190810_T58321/IPN
The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.
GCN Circular #25313
A. Kozlova, S. Golenetskii, R. Aptekar, D. Frederiks, M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, report:
The short-duration GRB 190810A (IPN triangulation: Hurley et al., GCN 25312) triggered Konus-Wind at T0=58318.421 s UT (16:11:58.421).
The burst light curve shows a single pulse which starts at T0-0.1 s and has a total duration of ~0.2 s.
As observed by Konus-Wind, the burst had a fluence of 2.29(-0.40,+0.85)x10^-6 erg/cm2, and a 16-ms peak flux, measured from T0-0.042 s, of 2.23(-0.55,+0.92)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
Since the most intense part of the burst was detected before the trigger, the spectral analysis was performed using the KW 3-channel light curve data.
Modeling the KW 3-channel time-integrated spectrum (from T0-0.098 s to T0+0.088 s) by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) yields alpha = -0.61 (-0.22,+0.27), and Ep = 1120 (-266,+656) keV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB190810_T58321/
All the quoted errors are at the 68% confidence level. All the quoted values are preliminary.

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Jochen Greiner, last update: 25-Aug-2019 [Disclaimer]