TITLE: GCN CIRCULAR NUMBER: 33546 SUBJECT: Fermi trigger No 701883729: Global MASTER-Net observations report DATE: 23/03/30 18:30:29 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 GRB230330.65 (trigger No 701883729,23h 36m 48.00s , -71d 23m 24.0s, R=7.86) errorbox 6587 sec after notice time and 6594 sec after trigger time at 2023-03-30 17:31:58 UT, with upper limit up to 18.1 mag. Observations started at twilight. The observations began at zenith distance = 70 deg. The sun altitude is -12.3 deg.

The galactic latitude b = -45 deg., longitude l = 311 deg.

Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2207407

We obtain a following upper limits.

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

6624 | 2023-03-30 17:31:58 | MASTER-SAAO | (23h 07m 13.46s , -70d 58m 57.0s) | C | 60 | 17.3 | 6704 | 2023-03-30 17:33:18 | MASTER-SAAO | (23h 31m 43.34s , -71d 00m 16.9s) | C | 60 | 17.6 | 6979 | 2023-03-30 17:37:53 | MASTER-SAAO | (00h 51m 09.70s , -70d 59m 16.2s) | C | 60 | 14.0 | 7069 | 2023-03-30 17:39:23 | MASTER-SAAO | (23h 00m 59.38s , -72d 54m 49.2s) | C | 60 | 17.4 | 7148 | 2023-03-30 17:40:42 | MASTER-SAAO | (23h 28m 12.92s , -72d 54m 18.3s) | C | 60 | 17.8 | 7318 | 2023-03-30 17:43:33 | MASTER-SAAO | (00h 12m 20.13s , -72d 53m 05.7s) | C | 60 | 18.0 | 7410 | 2023-03-30 17:45:05 | MASTER-SAAO | (23h 13m 46.69s , -69d 04m 36.6s) | C | 60 | 17.5 | 8133 | 2023-03-30 17:57:07 | MASTER-SAAO | (23h 36m 16.46s , -69d 04m 57.2s) | C | 60 | 18.0 | 8213 | 2023-03-30 17:58:27 | MASTER-SAAO | (23h 07m 27.72s , -71d 00m 29.9s) | C | 60 | 18.1 | 8303 | 2023-03-30 17:59:58 | MASTER-SAAO | (23h 32m 01.71s , -70d 58m 49.1s) | C | 60 | 18.1 | 8702 | 2023-03-30 18:06:37 | MASTER-SAAO | (23h 01m 23.47s , -72d 54m 03.2s) | C | 60 | 17.7 | 8782 | 2023-03-30 18:07:56 | MASTER-SAAO | (23h 28m 25.09s , -72d 54m 52.0s) | C | 60 | 18.1 | 9155 | 2023-03-30 18:14:10 | MASTER-SAAO | (23h 14m 08.69s , -69d 06m 31.0s) | C | 60 | 17.3 | 9327 | 2023-03-30 18:17:01 | MASTER-SAAO | (23h 07m 37.78s , -70d 58m 54.7s) | C | 60 | 17.5 | 9406 | 2023-03-30 18:18:20 | MASTER-SAAO | (23h 32m 14.04s , -70d 59m 44.3s) | C | 60 | 17.8 | 9705 | 2023-03-30 18:23:19 | MASTER-SAAO | (23h 01m 30.56s , -72d 53m 37.1s) | C | 60 | 17.9 | 9795 | 2023-03-30 18:24:49 | MASTER-SAAO | (23h 28m 40.59s , -72d 54m 58.7s) | C | 60 | 17.6 | Filter C is a clear (unfiltred) band.

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