Gamma-ray Burst 190805B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN Notice

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 05 Aug 19 04:46:25 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     586673165
GRB_RA:          216.517d {+14h 26m 04s} (J2000),
                 216.764d {+14h 27m 03s} (current),
                 215.885d {+14h 23m 32s} (1950)
GRB_DEC:          +2.933d {+02d 55' 60"} (J2000),
                  +2.846d {+02d 50' 45"} (current),
                  +3.158d {+03d 09' 29"} (1950)
GRB_ERROR:       7.23 [deg radius, statistical plus systematic]
GRB_INTEN:       468 [cnts/sec]
DATA_SIGNIF:     14.50 [sigma]
INTEG_TIME:      0.512 [sec]
GRB_DATE:        18700 TJD;   217 DOY;   19/08/05
GRB_TIME:        17160.97 SOD {04:46:00.97} UT
GRB_PHI:         280.00 [deg]
GRB_THETA:        30.00 [deg]
DATA_TIME_SCALE: 0.5120 [sec]
HARD_RATIO:      0.39
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,0,0, 1,0,0, 0,1,0, 0,0,0, 0,0,
SUN_POSTN:       134.98d {+08h 59m 54s}  +17.05d {+17d 02' 56"}
SUN_DIST:         81.32 [deg]   Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN:      190.57d {+12h 42m 17s}   +1.04d {+01d 02' 25"}
MOON_DIST:        26.24 [deg]
MOON_ILLUM:      23 [%]
GAL_COORDS:      350.09, 56.87 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      213.18, 16.46 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190805199/quicklook/glg_lc_medres34_bn190805199.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 196.37,22.40 [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 05 Aug 19 04:46:34 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      59
TRIGGER_NUM:     586673165
GRB_RA:          216.583d {+14h 26m 20s} (J2000),
                 216.831d {+14h 27m 19s} (current),
                 215.951d {+14h 23m 48s} (1950)
GRB_DEC:          +2.917d {+02d 55' 00"} (J2000),
                  +2.829d {+02d 49' 45"} (current),
                  +3.141d {+03d 08' 28"} (1950)
GRB_ERROR:       6.68 [deg radius, statistical plus systematic]
GRB_INTEN:       287 [cnts/sec]
DATA_SIGNIF:     23.70 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        18700 TJD;   217 DOY;   19/08/05
GRB_TIME:        17160.97 SOD {04:46:00.97} UT
GRB_PHI:         280.00 [deg]
GRB_THETA:        30.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.46
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,0,0, 1,0,0, 0,1,0, 0,0,0, 0,0,
SUN_POSTN:       134.98d {+08h 59m 54s}  +17.05d {+17d 02' 56"}
SUN_DIST:         81.39 [deg]   Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN:      190.57d {+12h 42m 18s}   +1.04d {+01d 02' 23"}
MOON_DIST:        26.30 [deg]
MOON_ILLUM:      23 [%]
GAL_COORDS:      350.17, 56.82 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      213.25, 16.47 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190805199/quicklook/glg_lc_medres34_bn190805199.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 196.37,22.40 [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 05 Aug 19 04:55:03 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     586673165
GRB_RA:          209.750d {+13h 59m 00s} (J2000),
                 209.982d {+13h 59m 56s} (current),
                 209.158d {+13h 56m 38s} (1950)
GRB_DEC:         +19.470d {+19d 28' 12"} (J2000),
                 +19.375d {+19d 22' 31"} (current),
                 +19.712d {+19d 42' 45"} (1950)
GRB_ERROR:       2.61 [deg radius, statistical only]
GRB_DATE:        18700 TJD;   217 DOY;   19/08/05
GRB_TIME:        17160.97 SOD {04:46:00.97} UT
GRB_PHI:         293.00 [deg]
GRB_THETA:        46.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       134.98d {+08h 59m 55s}  +17.05d {+17d 02' 50"}
SUN_DIST:         70.69 [deg]   Sun_angle= -5.0 [hr] (East of Sun)
MOON_POSTN:      190.65d {+12h 42m 37s}   +1.01d {+01d 00' 27"}
MOON_DIST:        26.38 [deg]
MOON_ILLUM:      23 [%]
GAL_COORDS:       10.21, 72.72 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      199.92, 29.47 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190805199/quicklook/glg_lc_medres34_bn190805199.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190805199/quicklook/glg_locplot_all_bn190805199.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:        This is likely a Long GRB.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(2.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=8346).

GCN Notice

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 05 Aug 19 04:46:38 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     586673165
GRB_RA:          209.800d {+13h 59m 12s} (J2000),
                 210.033d {+14h 00m 08s} (current),
                 209.206d {+13h 56m 49s} (1950)
GRB_DEC:         +18.460d {+18d 27' 36"} (J2000),
                 +18.365d {+18d 21' 56"} (current),
                 +18.702d {+18d 42' 08"} (1950)
GRB_ERROR:       1.57 [deg radius, statistical only]
DATA_SIGNIF:     29.70 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        18700 TJD;   217 DOY;   19/08/05
GRB_TIME:        17160.97 SOD {04:46:00.97} UT
GRB_PHI:         293.00 [deg]
GRB_THETA:        45.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       134.98d {+08h 59m 54s}  +17.05d {+17d 02' 56"}
SUN_DIST:         70.95 [deg]   Sun_angle= -5.0 [hr] (East of Sun)
MOON_POSTN:      190.57d {+12h 42m 18s}   +1.04d {+01d 02' 22"}
MOON_DIST:        25.79 [deg]
MOON_ILLUM:      23 [%]
GAL_COORDS:        7.41, 72.17 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      200.43, 28.56 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190805199/quicklook/glg_lc_medres34_bn190805199.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_586673165.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 Circular #25270
The Fermi GBM team reports the detection of a likely LONG GRB
At 04:46:00 UT on 5 Aug 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 190805B (trigger 586673165.970428 / 190805199).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 209.8, Dec = 19.5 (J2000 degrees, equivalent to J2000 13h 59m, 19d 30'), with a statistical uncertainty of 2.6 degrees.
The angle from the Fermi LAT boresight is 46.0 degrees.
The skymap can be found here: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190805199/quicklook/glg_skymap_all_bn190805199.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/bn190805199/quicklook/glg_healpix_all_bn190805199.fit
The GBM light curve can be found here: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190805199/quicklook/glg_lc_medres34_bn190805199.gif

GCN Notice

TITLE:           GCN/MAXI NOTICE
NOTICE_DATE:     Mon 05 Aug 19 05:10:10 UT
NOTICE_TYPE:     MAXI Unknown Source Position
EVENT_ID_NUM:    700151304
EVENT_RA:        211.85d {+14h 07m 25s} (J2000),
                 212.08d {+14h 08m 20s} (current),
                 211.27d {+14h 05m 04s} (1950)
EVENT_DEC:       +19.77d {+19d 45' 57"} (J2000),
                 +19.67d {+19d 40' 24"} (current),
                 +20.00d {+20d 00' 11"} (1950)
EVENT_ERROR:     1.0 [deg radius, stat+sys, 90% containment]
EVENT_FLUX:      109.0 +- 0.0 [mCrab]
EVENT_DATE:      18700 TJD;   217 DOY;   19/08/05
EVENT_TIME:      17369.00 SOD {04:49:29.00} UT
EVENT_TSCALE:    30s
EVENT_EBAND:     Medium, 4-10 keV
SUN_POSTN:       134.99d {+08h 59m 58s}  +17.04d {+17d 02' 40"}
SUN_DIST:         72.56 [deg] 
MOON_POSTN:      190.79d {+12h 43m 11s}   +0.95d {+00d 56' 59"}
MOON_DIST:        28.01 [deg] 
MOON_ILLUM:      23 [%] 
GAL_COORDS:       14.05, 71.11 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      201.89, 30.52 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        MAXI Unknown Source Position. GRB or unknown X-ray Transient.

GCN Circular #25271
T. Sato (Chuo U.), H. Negoro, M. Nakajima, W. Maruyama, M. Aoki, K. Kobayashi (Nihon U.), T. Mihara, T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, M. Serino, S. Sugita, H. Nishida, A. Yoshida (AGU), Y. Tsuboi, W. Iwakiri, R. Sasaki, H. Kawai (Chuo U.), M. Shidatsu (Ehime U.), N. Kawai, M. Sugizaki, M. Oeda, K. Shiraishi (Tokyo Tech), S. Nakahira, Y. Sugawara, S. Ueno, H. Tomida, M. Ishikawa, N.Isobe, R. Shimomukai, M. Tominaga (JAXA), Y. Ueda, A. Tanimoto, S. Yamada, S. Ogawa, K. Setoguchi, T. Yoshitake (Kyoto U.), H. Tsunemi, T. Yoneyama, K. Asakura, S. Ide (Osaka U.), M. Yamauchi, S. Iwahori, Y. Kurihara, K. Kurogi, K. Miike (Miyazaki U.), T. Kawamuro (NAOJ), K. Yamaoka (Nagoya U.), Y. Kawakubo (LSU) report on behalf of the MAXI team:
The MAXI/GSC nova alert system triggered on an uncatalogued X-ray transient source at 04:49:12 UT on 2019 August 05. Assuming that the source flux was constant over the transit, we obtain the source position at (R.A., Dec) = (211.853 deg, 19.766 deg) = (14 07 24, +19 45 57) (J2000) with a statistical 90% C.L. elliptical error region with long and short radii of 0.30 deg and 0.29 deg, respectively. The roll angle of the long axis from the north direction is 170.0 deg counterclockwise. There is an additional systematic uncertainty of 0.1 deg (90% containment radius). The X-ray flux averaged over the scan was 109 +- 18 mCrab (4.0-10.0keV, 1 sigma error).
Without assumptions on the source constancy, we obtain a rectangular error box for the transient source with the following corners:
```
(R.A., Dec) = (210.974, 20.151) deg = (14 03 53, +20 09 03) (J2000) 
(R.A., Dec) = (210.941, 19.551) deg = (14 03 45, +19 33 03) (J2000) 
(R.A., Dec) = (212.931, 19.442) deg = (14 11 43, +19 26 31) (J2000) 
(R.A., Dec) = (212.971, 20.042) deg = (14 11 53, +20 02 31) (J2000) 
```
There was no significant excess flux in the previous transit at 03:16 UT with an upper limit of 20 mCrab.
This burst is likely the same one that Fermi detected about 3 min earlier (Trigger number 586673165).
GCN Circular #25272
B. Biltzinger, F. Kunzweiler, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger 586673165 at 04:46:00 on 05 Aug. 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) = 207.8+/-2.2 deg Decl.(2000.0) = 19.4+/-2.0 deg We estimate an additional systematic error of 2 deg.
Further details are available at: https://grb.mpe.mpg.de/grb/GRB190805199/
The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB190805199/healpix
The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB190805199/json
GCN Circular #25275
P. A. Evans (U. Leicester) reports on behalf of the Swift team:
Swift has initiated a series of observations, tiled on the sky, of the MAXI GRB 190805B. Automated analysis of the XRT data will be presented online at http://www.swift.ac.uk/xrt_products/TILED_GRB00083
Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. The probability of finding serendipitous sources, unrelated to the MAXI event is high: 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).
This circular is an official product of the Swift-XRT team.
GCN Circular #25277
R. Hamburg (UAH) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 04:46:00.97 UT on 05 August 2019, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 190805B (trigger 586673165 / 190805199), which was also detected by the MAXI/GSC (Sato et al. 2019, GCN 25271). The Fermi GBM Final Real-time Localization (GCN 25270) is consistent with the MAXI position.
The angle from the Fermi LAT boresight at the GBM trigger time is 46 degrees.
The GBM light curve shows a spiky, multi-peaked structure with a duration (T90) of about 22 s (50-300 keV). The time-averaged spectrum from T0-4.6 s to T0+ 25.1 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.07 +/- 0.05 and the cutoff energy, parameterized as Epeak, is 389 +/- 51 keV.
The event fluence (10-1000 keV) in this time interval is (1.03 +/- 0.05)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+16 s in the 10-1000 keV band is 7.6 +/- 0.3 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 #25279
M. Perri (ASDC), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), J.A. Kennea (PSU), B. Sbarufatti (PSU), D.N. Burrows (PSU), K.L. Page (U. Leicester), A.P. Beardmore (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 MAXI-detected burst GRB 190805B (Sato et al. GCN Circ. 25271) in a series of observations tiled on the sky. The total exposure time is 1.3 ks, distributed over 7 tiles; the maximum exposure at a single sky location was 391 s. The data were collected between T0+47.6 ks and T0+49.0 ks, and are entirely in Photon Counting (PC) mode.
No X-ray sources have been detected. The 3-sigma upper limit in the field (not including the regions where the tiles overlap) ranges from ~0.03 to ~0.11 ct s^-1, corresponding to a 0.3-10 keV observed flux of 1.2e-12 to 4.4e-12 erg cm^-2 s^-1 (assuming a typical GRB spectrum).
The results of the XRT-team automatic analysis of the tiled XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/xrt_products/TILED_GRB00083.
This circular is an official product of the Swift-XRT team.
GCN Circular #25285
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 long-duration GRB 190805B (MAXI/GSC detection: Sato et al., GCN Circ. 25271; Fermi/GBM detection: Hamburg & Meegan, GCN Circ. 25277) triggered Konus-Wind at T0=17159.354 s UT (04:45:59.354).
The burst light curve shows a multipeaked structure which starts at ~T0-6.1 s and has a total duration of ~27.9 s. The emission is seen up to ~6 MeV.
As observed by Konus-Wind, the burst had a fluence of 1.46(-0.16,+0.24)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+14.832 s, of 4.76(-1.60,+8.56)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the burst (measured from T0 to T0+24.832 s) is best fit in the 20 keV - 6 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -1.07(-0.23,+0.26) and Ep = 315(-73,+148) keV (chi2 = 66/79 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.0 (chi2 = 65/78 dof).
The spectrum near the maximum count rate (measured from T0+8.448 to T0+16.640 s) is best fit in the 20 keV - 6 MeV range by a power law with exponential cutoff model with alpha = -1.28(-0.44,+0.55) and Ep = 281(-118,-281) keV (chi2 = 45/78 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -1.7 (chi2 = 44/77 dof).
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB190805_T17159/
All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
GCN Circular #25287
P. Ghumatkar, V. Sharma and D. Bhattacharya and A. Vibhute (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data showed the detection of a long GRB 190805B, which was also detected by Fermi GBM Final Real-time Localization (GCN #25270), MAXI/GSC detection (Sato T. et al., GCN #25271), BALROG localization (Biltzinger B. et al., GCN #25272), Tiled Swift observations (Evans P. A. et al., GCN #25275), Fermi GBM detection (Hamburg R. et al., GCN #25277), Swift-XRT (Perri M. et al., GCN #25279) and Konus-Wind (Kozlova A. et al., GCN #25285).
The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple pulses of emission with the strongest peak at 04:46:05.0 UT. The measured peak count rate associated with the burst is 323 cts/s above the background in the combined data of four quadrants, with a total of 4289 cts. The local mean background count rate was 588 cts/s. Using cumulative rates, we measure a T90 of 24 s.
It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range.
CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC and PRL. The Indian Space Research Organisation funded, managed and facilitated the project.
GCN Circular #25316
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,
A. Kozlova, S. Golenetskii, R. Aptekar, D. Frederiks, D. Svinkin, 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 190805B (MAXI/GSC detection: Sato et al., GCN Circ. 25271; Fermi/GBM detection: Hamburg & Meegan, GCN Circ. 25277) was detected by Fermi (GBM trigger 586673165), INTEGRAL (SPI-ACS), Mars-Odyssey (HEND), Konus-Wind and MAXI (GSC) at about 17159 s UT (04:45:59).
We have triangulated it to a Konus-HEND annulus centered at RA(2000)=321.552 deg (21h 26m 13s) Dec(2000)=-16.302 deg (-16d 18' 08"), whose radius is 61.012 +/- 0.062 deg (3 sigma).
Only a rectangular error box of the MAXI/GSC position reported by Sato et al. (GCN Circ. 25271) is consistent with the annulus. The annulus combined with the MAXI (90 % containment, statistical-only) localization gives the following error box:
```
   ---------------------------------------------
    RA(2000), deg                 Dec(2000), deg
   ---------------------------------------------
   Center:
    212.376 (14h 09m 30s) +19.776 (+19d 46' 32")
   Corners:
    212.356 (14h 09m 25s) +20.078 (+20d 04' 39")
    212.487 (14h 09m 57s) +20.071 (+20d 04' 15")
    212.395 (14h 09m 35s) +19.474 (+19d 28' 25")
    212.265 (14h 09m 03s) +19.480 (+19d 28' 49")
   ---------------------------------------------
```
The error box area is 267 sq. arcmin (a factor of 16 smaller than that of the MAXI error box), and its maximum dimension is 38 arcmin (the minimum one is 7 arcmin). The Sun distance was ~73 deg.
The box is partially covered with the Swift XRT observations reported by Perri et al. (GCN Circ. 25279).
This box may be improved.
A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB190805_T17159/IPN/

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Jochen Greiner, last update: 13-Aug-2019 [Disclaimer]