////////////////////////////////////////////////////////////////////////
TITLE:   GCN CIRCULAR
NUMBER:  32150
SUBJECT: GRB 220530A: Fermi GBM Final Real-time Localization
DATE:    22/05/30 11:20:18 GMT
FROM:    Fermi GBM Team at MSFC/Fermi-GBM  <do_not_reply@GIOC.nsstc.nasa.gov>

The Fermi GBM team reports the detection of a likely LONG GRB

At 11:09:58 UT on 30 May 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220530A (trigger 675601803.514142 / 220530465).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 159.4, Dec = 13.6 (J2000 degrees, equivalent to J2000 10h 37m, 13d 35'), with a statistical uncertainty of 8.5 degrees.

The angle from the Fermi LAT boresight is 86.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220530465/quicklook/glg_skymap_all_bn220530465.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/bn220530465/quicklook/glg_healpix_all_bn220530465.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220530465/quicklook/glg_lc_medres34_bn220530465.gif

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TITLE:   GCN CIRCULAR
NUMBER:  32153
SUBJECT: Fermi GRB 220530A: Global MASTER-Net observations report 
DATE:    22/05/30 17:00:34 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>

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-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 220530A ( Fermi GBM team, GCN 32150) errorbox  19032 sec after notice time and 19042 sec after trigger time at 2022-05-30 16:27:21 UT, with upper limit up to  18.7 mag. Observations started at twilight.  The observations began at zenith distance = 45 deg. The sun  altitude  is -9.6 deg. 

The galactic latitude b = 56 deg., longitude l = 231 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1990415

We obtain a following upper limits.  

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

   19073 | 2022-05-30 16:27:21 |         MASTER-SAAO | (10h 33m 16.57s , +12d 38m 44.9s) |   C |    60 | 16.4 |        
   19152 | 2022-05-30 16:28:40 |         MASTER-SAAO | (10h 41m 18.61s , +12d 37m 46.0s) |   C |    60 | 16.7 |        
   19243 | 2022-05-30 16:30:11 |         MASTER-SAAO | (10h 38m 18.02s , +14d 33m 41.8s) |   C |    60 | 17.0 |        
   19323 | 2022-05-30 16:31:31 |         MASTER-SAAO | (10h 46m 30.38s , +14d 31m 55.2s) |   C |    60 | 17.1 |        
   19413 | 2022-05-30 16:33:01 |         MASTER-SAAO | (10h 22m 42.94s , +14d 33m 06.7s) |   C |    60 | 16.6 |        
   19493 | 2022-05-30 16:34:21 |         MASTER-SAAO | (10h 30m 54.84s , +14d 34m 05.5s) |   C |    60 | 17.2 |        
   19585 | 2022-05-30 16:35:53 |         MASTER-SAAO | (10h 28m 59.84s , +10d 44m 05.0s) |   C |    60 | 17.1 |        
   19676 | 2022-05-30 16:37:24 |         MASTER-SAAO | (10h 37m 11.28s , +10d 44m 16.3s) |   C |    60 | 17.3 |        
   19756 | 2022-05-30 16:38:44 |         MASTER-SAAO | (10h 28m 29.73s , +16d 26m 25.4s) |   C |    60 | 17.3 |        
   19846 | 2022-05-30 16:40:14 |         MASTER-SAAO | (10h 36m 50.40s , +16d 28m 04.8s) |   C |    60 | 17.8 |        
   19926 | 2022-05-30 16:41:34 |         MASTER-SAAO | (10h 17m 52.90s , +12d 40m 21.7s) |   C |    60 | 17.6 |        
   20017 | 2022-05-30 16:43:05 |         MASTER-SAAO | (10h 26m 07.04s , +12d 39m 18.9s) |   C |    60 | 17.8 |        
   20096 | 2022-05-30 16:44:24 |         MASTER-SAAO | (10h 33m 20.86s , +12d 38m 17.1s) |   C |    60 | 18.1 |        
   20188 | 2022-05-30 16:45:56 |         MASTER-SAAO | (10h 41m 35.71s , +12d 38m 18.2s) |   C |    60 | 18.5 |        
   20279 | 2022-05-30 16:47:27 |         MASTER-SAAO | (10h 38m 27.28s , +14d 34m 00.9s) |   C |    60 | 18.6 |        
   20359 | 2022-05-30 16:48:47 |         MASTER-SAAO | (10h 46m 39.92s , +14d 32m 42.8s) |   C |    60 | 18.6 |        
   20450 | 2022-05-30 16:50:18 |         MASTER-SAAO | (10h 22m 57.25s , +14d 34m 10.0s) |   C |    60 | 18.4 |        
   20529 | 2022-05-30 16:51:37 |         MASTER-SAAO | (10h 31m 03.96s , +14d 33m 31.5s) |   C |    60 | 18.7 |        
   20620 | 2022-05-30 16:53:08 |         MASTER-SAAO | (10h 29m 07.46s , +10d 46m 30.5s) |   C |    60 | 18.7 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.