Gamma-ray Burst 190720A

(All information courtesy of the instrument teams.)

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Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 20 Jul 19 14:42:34 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     585326534
GRB_RA:          206.417d {+13h 45m 40s} (J2000),
                 206.619d {+13h 46m 28s} (current),
                 205.900d {+13h 43m 36s} (1950)
GRB_DEC:         +45.083d {+45d 04' 60"} (J2000),
                 +44.986d {+44d 59' 09"} (current),
                 +45.333d {+45d 19' 59"} (1950)
GRB_ERROR:       3.98 [deg radius, statistical plus systematic]
GRB_INTEN:       1433 [cnts/sec]
DATA_SIGNIF:     44.40 [sigma]
INTEG_TIME:      0.512 [sec]
GRB_DATE:        18684 TJD;   201 DOY;   19/07/20
GRB_TIME:        52929.78 SOD {14:42:09.78} UT
GRB_PHI:          74.00 [deg]
GRB_THETA:        55.00 [deg]
DATA_TIME_SCALE: 0.5120 [sec]
HARD_RATIO:      0.73
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   2%  Generic Transient
DETECTORS:       1,0,1, 0,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       119.69d {+07h 58m 45s}  +20.64d {+20d 38' 08"}
SUN_DIST:         73.47 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      341.79d {+22h 47m 08s}  -12.19d {-12d 11' 40"}
MOON_DIST:       129.76 [deg]
MOON_ILLUM:      88 [%]
GAL_COORDS:       95.38, 69.03 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      180.59, 50.77 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190720613/quicklook/glg_lc_medres34_bn190720613.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 152.23,24.80 [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 20 Jul 19 14:42:44 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      59
TRIGGER_NUM:     585326534
GRB_RA:          206.450d {+13h 45m 48s} (J2000),
                 206.652d {+13h 46m 36s} (current),
                 205.934d {+13h 43m 44s} (1950)
GRB_DEC:         +45.200d {+45d 12' 00"} (J2000),
                 +45.103d {+45d 06' 10"} (current),
                 +45.450d {+45d 26' 59"} (1950)
GRB_ERROR:       3.80 [deg radius, statistical plus systematic]
GRB_INTEN:       1929 [cnts/sec]
DATA_SIGNIF:     172.10 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        18684 TJD;   201 DOY;   19/07/20
GRB_TIME:        52929.78 SOD {14:42:09.78} UT
GRB_PHI:          74.00 [deg]
GRB_THETA:        55.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.91
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      98%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       1,0,1, 0,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       119.69d {+07h 58m 45s}  +20.64d {+20d 38' 08"}
SUN_DIST:         73.46 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      341.79d {+22h 47m 09s}  -12.19d {-12d 11' 39"}
MOON_DIST:       129.69 [deg]
MOON_ILLUM:      88 [%]
GAL_COORDS:       95.52, 68.92 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      180.52, 50.88 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190720613/quicklook/glg_lc_medres34_bn190720613.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 152.23,24.80 [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 20 Jul 19 14:42:48 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     585326534
GRB_RA:          201.600d {+13h 26m 24s} (J2000),
                 201.814d {+13h 27m 15s} (current),
                 201.051d {+13h 24m 12s} (1950)
GRB_DEC:         +42.000d {+42d 00' 00"} (J2000),
                 +41.899d {+41d 53' 56"} (current),
                 +42.259d {+42d 15' 34"} (1950)
GRB_ERROR:       1.32 [deg radius, statistical only]
DATA_SIGNIF:     146.20 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        18684 TJD;   201 DOY;   19/07/20
GRB_TIME:        52929.78 SOD {14:42:09.78} UT
GRB_PHI:          71.00 [deg]
GRB_THETA:        59.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       119.69d {+07h 58m 45s}  +20.64d {+20d 38' 08"}
SUN_DIST:         70.68 [deg]   Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN:      341.79d {+22h 47m 09s}  -12.19d {-12d 11' 38"}
MOON_DIST:       134.28 [deg]
MOON_ILLUM:      88 [%]
GAL_COORDS:       99.50, 73.50 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      178.74, 46.28 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190720613/quicklook/glg_lc_medres34_bn190720613.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_585326534.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
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/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 20 Jul 19 14:51:31 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     585326534
GRB_RA:          202.720d {+13h 30m 53s} (J2000),
                 202.933d {+13h 31m 44s} (current),
                 202.175d {+13h 28m 42s} (1950)
GRB_DEC:         +41.780d {+41d 46' 48"} (J2000),
                 +41.680d {+41d 40' 47"} (current),
                 +42.037d {+42d 02' 14"} (1950)
GRB_ERROR:       1.16 [deg radius, statistical only]
GRB_DATE:        18684 TJD;   201 DOY;   19/07/20
GRB_TIME:        52929.78 SOD {14:42:09.78} UT
GRB_PHI:          72.00 [deg]
GRB_THETA:        59.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       119.69d {+07h 58m 47s}  +20.63d {+20d 38' 04"}
SUN_DIST:         71.54 [deg]   Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN:      341.86d {+22h 47m 26s}  -12.17d {-12d 10' 14"}
MOON_DIST:       133.67 [deg]
MOON_ILLUM:      88 [%]
GAL_COORDS:       96.59, 73.27 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      179.93, 46.54 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190720613/quicklook/glg_lc_medres34_bn190720613.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190720613/quicklook/glg_locplot_all_bn190720613.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:        In the LAT Field-of-view.  
COMMENTS:        Bright hard burst in the GBM.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(2.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=8332).

GCN Circular #25123
The Fermi GBM team reports the detection of a likely LONG GRB
At 14:42:09 UT on 20 Jul 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 190720A (trigger 585326534.78377 / 190720613).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 202.7, Dec = 41.8 (J2000 degrees, equivalent to J2000 13h 30m, 41d 47'), with a statistical uncertainty of 1.2 degrees.
The angle from the Fermi LAT boresight is 59.0 degrees.
The skymap can be found here: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190720613/quicklook/glg_skymap_all_bn190720613.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/bn190720613/quicklook/glg_healpix_all_bn190720613.fit
The GBM light curve can be found here: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190720613/quicklook/glg_lc_medres34_bn190720613.gif
GCN Circular #25124
F. Kunzweiler, B. Biltzinger, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger 585326534 at 14:42:09 on 20 July 2019 were automatically fitted for spectrum and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427; Berlato et al. 2019, ApJ 873, 60).
The best-fit position (1 sigma statistical errors) is:
```
RA(2000.0) = 203.4+/-0.6 deg
Decl.(2000.0) = 42.7+/-0.5 deg
```
We estimate an additional systematic error of 2 deg.
Further details are available at: https://grb.mpe.mpg.de/grb/GRB190720613/
The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB190720613/healpix
The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB190720613/json
GCN Circular #25131
C. M. Hui (NASA-MSFC) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
At 14:42:09.78 UT on 20 July 2019, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 190720A (trigger 585326534/190720613).
The on-ground calculated location, using the GBM trigger data, is RA = 202.72 , DEC = +41.78 (J2000 degrees, equivalent to 13h 30m, +41d 42.0'), with an uncertainty of 1.16 degrees (radius, 1-sigma containment, statistical only; there is additionally a systematic error which we have characterized as a core-plus-tail model, with 90% of GRBs having a 3.7 deg error and a small tail suffering a larger than 10 deg systematic error [Connaughton et al. 2015, ApJS, 216, 32] ). The angle from the Fermi LAT boresight is 59.00 degrees.
The GBM light curve shows/consists of single peak with a duration (T90) of about 6.1s (50-300 keV). The time-averaged spectrum from T0-0.0s to T0+8.8s is adequately fit by a Band function with Epeak = 182 +/- 6 keV, alpha = -0.89 +/- 0.02, and beta = -2.21 +/- 0.04.
The event fluence (10-1000 keV) in this time interval is (2.74 +/- 0.03)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+2.5s in the 10-1000 keV band is 48.2 +/- 0.5 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/
GCN Circular #25139
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,
and
W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on behalf of the GRS-Odyssey GRB team, report:
The long-duration GRB 190720A (Fermi-GBM detection: Fermi GBM Team, GCN Circ. 25123, Hui and Meegan, GCN Circ. 25131; BALROG localization: Kunzweiler et al., GCN Circ. 25124) was detected by Fermi (GBM trigger 585326534), Konus-Wind, INTEGRAL (SPI-ACS), and Mars-Odyssey (HEND) at about 52930 s UT (14:42:10).
We have triangulated it to a preliminary, 3 sigma error box whose coordinates are:
```
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
   205.406 (13h 41m 37s) +41.340 (+41d 20' 25")
  Corners:
   205.272 (13h 41m 05s) +50.612 (+50d 36' 42")
   205.533 (13h 42m 08s) +49.639 (+49d 38' 19")
   204.561 (13h 38m 15s) +31.484 (+31d 29' 04")
   204.550 (13h 38m 12s) +32.598 (+32d 35' 54")
  ---------------------------------------------
```
The error box area is about 2.4 sq. deg, and its maximum dimension is 19.1 deg (the minimum one is 7.8 arcmin). The Sun distance was about 71 deg.
This box may be improved.
This burst is spatially and temporally inconsistent with LIGO/Virgo S190720a (LVC GCN Circ. 25115).
A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB190720_T52927/IPN
The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.
GCN Circular #25148
Y. Kawakubo (LSU), A. Yoshida, T. Sakamoto, V. Pal'shin, S. Sugita (AGU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), Y. Asaoka, S. Ozawa, S. Torii (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC), M. L. Cherry (LSU), S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena) and the CALET collaboration:
The long bright GRB 190720A (Fermi GBM detection: Hui and Meegan, GCN Circ. 25131; BALROG localization: Kunzweiler et al., GCN Circ. 25124; IPN triangulation: Hurley et al., GCN Circ. 25139) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 14:42:10.000 UTC on 20 July 2019. The burst signal was seen by all CGBM detectors. No real-time CGBM GCN notice was distributed about this trigger because the real-time communication from the ISS was off (loss of signal).
The burst light curve shows a single multi-peaked pulse which starts at T-0.2 sec, peaks at 2.4 sec and ends at T+14.0 sec. The T90 and T50 durations measured by the SGM data are 5.9 +- 1.0 sec and 2.1 +- 0.2 sec (40-1000 keV), respectively.
The ground processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1247668851/
The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University.

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Jochen Greiner, last update: 23-Aug-2019 [Disclaimer]