//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32092 SUBJECT: GRB 220523A: Fermi GBM Final Real-time Localization DATE: 22/05/23 04:21:51 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 04:11:29 UT on 23 May 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220523A (trigger 674971894.896998 / 220523175). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 136.7, Dec = -37.5 (J2000 degrees, equivalent to J2000 09h 06m, -37d 30'), with a statistical uncertainty of 8.3 degrees. The angle from the Fermi LAT boresight is 64.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220523175/quicklook/glg_skymap_all_bn220523175.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220523175/quicklook/glg_healpix_all_bn220523175.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220523175/quicklook/glg_lc_medres34_bn220523175.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32093 SUBJECT: Fermi GRB 220523A: Global MASTER-Net observations report DATE: 22/05/23 04:45:21 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev (Irkutsk State University, API), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational State University) MASTER-OAGH robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Mexico (OAGH National Institute for Astrophysics, Optics and Electronics) started inspect of the Fermi GRB 220523A ( Fermi GBM team, GCN 32092) errorbox 293 sec after notice time and 330 sec after trigger time at 2022-05-23 04:17:00 UT, with upper limit up to 13.7 mag. The observations began at zenith distance = 81 deg. The sun altitude is -23.0 deg. MASTER-OAFA robotic telescope located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 220523A errorbox 1093 sec after notice time and 1130 sec after trigger time at 2022-05-23 04:30:20 UT, with upper limit up to 16.4 mag. The observations began at zenith distance = 82 deg. The sun altitude is -79.5 deg. The galactic latitude b = 7 deg., longitude l = 262 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1981570 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 361 | 2022-05-23 04:17:00 | MASTER-OAGH | (09h 03m 15.41s , -27d 18m 29.2s) | C | 60 | 13.0 | 467 | 2022-05-23 04:18:46 | MASTER-OAGH | (09h 12m 12.12s , -27d 17m 32.7s) | C | 60 | 13.3 | 1161 | 2022-05-23 04:30:20 | MASTER-OAFA | (09h 03m 53.93s , -36d 01m 09.5s) | C | 60 | 16.3 | 1252 | 2022-05-23 04:31:52 | MASTER-OAFA | (09h 13m 51.60s , -35d 59m 56.3s) | C | 60 | 16.4 | 1443 | 2022-05-23 04:35:02 | MASTER-OAGH | (09h 40m 56.38s , -30d 37m 34.2s) | C | 60 | 13.7 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.