//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28017 SUBJECT: GRB 200623B: Fermi GBM Final Real-time Localization DATE: 20/06/23 18:13:12 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely SHORT GRB At 18:02:48 UT on 23 Jun 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200623B (trigger 614628173.95347 / 200623752). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 344.9, Dec = -47.0 (J2000 degrees, equivalent to J2000 22h 59m, -47d 00'), with a statistical uncertainty of 5.2 degrees. The angle from the Fermi LAT boresight is 65.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200623752/quicklook/glg_skymap_all_bn200623752.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200623752/quicklook/glg_healpix_all_bn200623752.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200623752/quicklook/glg_lc_medres34_bn200623752.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28018 SUBJECT: Fermi GRB 200623B: Global MASTER-Net observations report DATE: 20/06/23 18:30:18 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University) MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 200623B ( Fermi GBM team, GCN 28017) errorbox 552 sec after notice time and 590 sec after trigger time at 2020-06-23 18:12:39 UT, with upper limit up to 18.9 mag. The observations began at zenith distance = 74 deg. The sun altitude is -30.9 deg. The galactic latitude b = -43 deg., longitude l = 328 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1388895 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 620 | 2020-06-23 18:12:39 | MASTER-SAAO | (21h 51m 50.01s , -64d 03m 54.4s) | C | 60 | 18.6 | 713 | 2020-06-23 18:14:12 | MASTER-SAAO | (22h 08m 29.53s , -66d 03m 58.4s) | C | 60 | 18.9 | 713 | 2020-06-23 18:14:12 | MASTER-SAAO | (22h 25m 14.90s , -66d 03m 19.6s) | C | 60 | 18.6 | 793 | 2020-06-23 18:15:32 | MASTER-SAAO | (22h 37m 18.63s , -68d 05m 13.2s) | C | 60 | 18.9 | 793 | 2020-06-23 18:15:32 | MASTER-SAAO | (22h 55m 31.23s , -68d 04m 31.7s) | C | 60 | 18.7 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28024 SUBJECT: IPN triangulation of GRB 200623B (short) DATE: 20/06/24 16:50:10 GMT FROM: Anna Ridnaia at Ioffe Institute A. Ridnaia, S. Golenetskii, R. Aptekar, D. Frederiks, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, K. Hurley, on behalf of the IPN, 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 S. Barthelmy, J. Cummings, H. Krimm, and D. Palmer, on behalf of the Swift-BAT team, report: The short-duration GRB 200623B (Fermi-GBM detection: The Fermi GBM team, GCN Circ. 28017) has been detected by Fermi (GBM trigger 614628173), Konus-Wind, INTEGRAL (SPI-ACS), and Swift (BAT), so far, at about 64968 s UT (18:02:48). 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: 343.079 (22h 52m 19s) -53.378 (-53d 22' 41") Corners: 330.417 (22h 01m 40s) -61.535 (-61d 32' 06") 328.804 (21h 55m 13s) -63.180 (-63d 10' 48") 349.757 (23h 19m 02s) -41.929 (-41d 55' 45") 348.242 (23h 12m 58s) -43.351 (-43d 21' 04") ---------------------------------------------- The error box area is 17.6 sq. deg, and its maximum dimension is 24.5 deg (the minimum one is 46 arcmin). The Sun distance was about 115 deg. This box may be improved. The IPN localization is consistent with, but reduces the area of, the Fermi-GBM final position (GCN Circ. 28017). A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB200623_T64972/IPN/ The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28037 SUBJECT: Konus-Wind detection of short/hard GRB 200623B DATE: 20/06/28 18:08:03 GMT FROM: Anastasia Tsvetkova at Ioffe Institute A. Tsvetkova, S. Golenetskii, R.Aptekar, D. Frederiks, M. Ulanov, D. Svinkin, A. Lysenko, A. Ridnaia and T. Cline on behalf of the Konus-Wind team, report: The short-duration, hard-spectrum GRB200623B (IPN triangulation: Ridnaia et al., GCN 28024) triggered Konus-Wind at T0=64972.561 s UT (18:02:52.561). The light curve of the burst shows two pulses in the interval from ~T0-0.2 s to ~T0+0.3  s. The emission is seen up to ~1 MeV. As observed by Konus-Wind, the burst had a fluence of 1.02(-0.23,+0.57)x10^-6 erg/cm2, and a 64-ms peak energy flux, measured from T0-0.086 s, of 6.65(-1.47,+3.74)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range). Fitting the time-integrated 3-channel spectrum of the burst (measured from T0-0.118 s to T0+0.304 s) in the 20 keV - 1.5 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) yields alpha = -0.37(-0.41,+0.59), and Ep = 753(-217,+582) keV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB200623_T64972/ All the quoted errors are at the 68% confidence level. All the quoted values are preliminary.