TITLE:   GCN CIRCULAR
NUMBER:  31761
SUBJECT: GRB 220315A: MASTER Global Robotic Net optical observations
DATE:    22/03/15 23:08:26 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,
V.Senik, D.Kuvshinov, Ya.Kechin, Yu.Tselik (Lomonosov Moscow State University, SAI, Physics Department),
C.Francile, R. Podesta, C.Lopez, F. Podesta (Observatorio Astronomico Felix Aguilar OAFA),
D.A.H.Buckley (SAAO),
R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, 
A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory),
N.M.Budnev, O.A.Gress (ISU,API),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov (Blagoveschensk Educational State University)

MASTER Global Robotic Net (http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)
started Fermi GRB 220315A (Fermi GBM team GCN 31758, Ttrigger= 2022-03-15 02:25:56 UT) alert observations at 
MASTER-OAFA robotic telescope, located in Argentina (OAFA observatory of San Juan National University)
  518 sec after notice time (549 sec after trigger time) at 2022-03-15 02:35:05 UT, with upper limit up to  17.8 mag. 
The observations began at zenith distance = 61 deg. The sun  altitude was -44.7 deg.
The galactic latitude b = -18 deg.,longitude l = 313 deg.

MASTER-SAAO started observations just after sunset at 2022-03-15 17:39:36UT with  upper limits 17.0 mag at first image.
The observations began at 23deg altitude, the sun altitude was -10deg.

Real time updated cover map and OT, that can be discovered, will be available here:
https://master.sai.msu.ru/site/master2/observ.php?id=1911047

We obtained the following upper limits at first images
Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
      619 | 2022-03-15 02:35:05 |         MASTER-OAFA | (15h 42m 55.34s , -77d 27m 34.1s) |   C |   140 | 17.7 |
      814 | 2022-03-15 02:38:05 |         MASTER-OAFA | (15h 43m 03.16s , -77d 27m 05.3s) |   C |   170 | 17.8 |
Filter C is a clear (unfiltred) band.


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