//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 25123 SUBJECT: GRB 190720A: Fermi GBM Final Real-time Localization DATE: 19/07/20 14:54:07 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM 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 //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 25124 SUBJECT: GRB 190720A: BALROG localization (Fermi Trigger 585326534 / GRB 190720613) DATE: 19/07/20 15:17:17 GMT FROM: Jochen Greiner at MPE,Garching 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 //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 25131 SUBJECT: GRB 190720A: Fermi GBM detection DATE: 19/07/20 23:13:48 GMT FROM: C. Michelle Hui at MSFC/Fermi-GBM 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/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 25139 SUBJECT: IPN triangulation of GRB 190720A DATE: 19/07/22 22:53:38 GMT FROM: Dmitry Svinkin at Ioffe Institute 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 25148 SUBJECT: GRB 190720A: CALET Gamma-Ray Burst Monitor detection DATE: 19/07/25 05:57:30 GMT FROM: Valentin Pal'shin at AGU 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.