//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27690 SUBJECT: GRB 200506A: Fermi GBM Final Real-time Localization DATE: 20/05/06 00:39:00 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 00:28:41 UT on 6 May 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200506A (trigger 610417726.052718 / 200506020). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 271.7, Dec = -4.4 (J2000 degrees, equivalent to J2000 18h 06m, -4d 24'), with a statistical uncertainty of 3.9 degrees. The angle from the Fermi LAT boresight is 87.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200506020/quicklook/glg_skymap_all_bn200506020.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/bn200506020/quicklook/glg_healpix_all_bn200506020.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200506020/quicklook/glg_lc_medres34_bn200506020.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27695 SUBJECT: Swift GRB200506.73: Global MASTER-Net observations report DATE: 20/05/06 17:46:13 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-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) was pointed to the Swift GRB200506.73 (trigger No 969823,18h 17m 59.52s , -16d 09m 07.2s, R=0.05) errorbox 14 sec after notice time and 29 sec after trigger time at 2020-05-06 17:37:19 UT, with upper limit up to 14.1 mag. The observations began at zenith distance = 68 deg. The sun altitude is -17.4 deg. The galactic latitude b = -1 deg., longitude l = 15 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1351465 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 34 | MASTER-Amur | P/ | 10 | 13.1 | 58 | MASTER-Amur | P/ | 10 | 13.1 | 90 | MASTER-Amur | P/ | 20 | 13.5 | 123 | MASTER-Amur | P/ | 20 | 13.5 | 162 | MASTER-Amur | P/ | 30 | 13.8 | 210 | MASTER-Amur | P/ | 40 | 13.8 | 266 | MASTER-Amur | P/ | 50 | 14.1 | The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27698 SUBJECT: GRB 200506A: AstroSat CZTI detection DATE: 20/05/07 14:33:06 GMT FROM: Soumya Gupta at IUCAA/ASTROSAT S. Gupta, V. Sharma and D. Bhattacharya (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (IUCAA/TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration: Analysis of AstroSat CZTI data showed the weak detection of a long GRB 200506A, which was also detected by Fermi GBM (GCN #27690). The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks of emission with the strongest peak at 2020-05-06 00:28:53.176 UT. The measured peak count rate associated with the burst is 143 +/- 20 cts/s above the background in the combined data of four quadrants, with a total of 1364 +/- 27 cts. The local mean background count rate was 538 +/- 1.0 cts/s. Using cumulative rates, we measure a T90 of 26.09 +/- 0.08 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.