[vsnet-grb-info 33872] LXT 240402A: MASTER optical observations with AGN in error-box

3 Apr 2024

      TITLE:   GCN CIRCULAR
NUMBER:  36019
SUBJECT: LXT 240402A: MASTER optical observations with AGN in error-box
DATE:    24/04/03 23:16:13 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>

V.Lipunov, P.Balanutsa (Lomonosov MSU), D.Buckley (SAAO), O.Gress, N.Budnev(ISU), K.Zhirkov, A.Kuznetsov,
G.Antipov, N.Tiurina,   E.Gorbovskoy, Ya.Kechin, D.Vlasenko, Yu.Tselik, I.Gorbunov,
V.Vladimirov,D.Zimnukhov, V.Senik, A.Yudin,A.Chasovnikov, D.Cheryasov(Lomonosov MSU,SAI,PhysicsDepartment),
A.Sosnovskij (Crimean Astrophysical Observatory, RAS),
C.Francile.  F. Podesta, R.Podesta (Observatorio Astronomico Felix AguilarOAFA),
R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity)

MASTER Global robotic net (http://observ.pereplet.ru Lipunov et al.,2010,Advances in Astronomy,2010,30L)
started  LXT 240402A (Xu et al. GCN 36016, Triggertime=2024-04-02 08:47:41UT, Notice=24/04/03 16:20:48;
Center R.A.,Dec. = 245.438 +25.800 +-1.5 arcmin; also detected by GECAM-C (GCN 36017 Wang-Chen Xue et al.))
observation at 2024-04-03 02:48:45 (optical observations also started by GWAC-F50A (Xin et al. GCN 36018))

MASTER-SAAO robotic telescope  located in South Africa was pointed to errorbox
64864 sec after trigger time at 2024-04-03 02:48:45 UT (by own observational program), with upper limit up to  19.3 mag.
The observations began at zenith distance = 60 deg. The sun  altitude  is -26.7 deg.

MASTER-Tunka robotic telescope (Russia, Baikal)  was pointed  1 days 28326 sec after trigger time at 2024-04-03 16:39:47 UT, with upper limit up to  20.0 mag.
The observations began at zenith distance = 52 deg. The sun  altitude  is -33.1 deg.

MASTER-Amur robotic telescope  (Russia, Blagoveschensk) was pointed 1 days 28367 sec after trigger time at
2024-04-03 16:40:28 UT, with upper limit up to  19.0 mag.
The observations began at zenith distance = 37 deg. The sun  altitude  is -32.6 deg.

The analysis of LERG AGN (Comerford et al. 2020), locate in 75" frin the errir-box center) light curve in MASTER database will be continued.

The galactic latitude b = 43 deg., longitude l = 44 deg.

Real time updated cover map and possibly OT, that can be discovered, will be  available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2413927

We obtain the following upper limits.

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

   64894 | 2024-04-03 02:48:45 |         MASTER-SAAO | (16h 19m 12.57s , +27d 40m 03.0s) |   C |    60 | 18.2 |
   65856 | 2024-04-03 03:04:47 |         MASTER-SAAO | (16h 19m 18.33s , +27d 39m 39.9s) |   C |    60 | 18.1 |
   66812 | 2024-04-03 03:20:43 |         MASTER-SAAO | (16h 19m 23.87s , +27d 41m 06.6s) |   C |    60 | 18.4 |
   67771 | 2024-04-03 03:36:41 |         MASTER-SAAO | (16h 17m 58.29s , +25d 59m 53.5s) |   C |    60 | 18.3 |
   67831 | 2024-04-03 03:36:41 |         MASTER-SAAO | (16h 17m 58.29s , +25d 59m 53.3s) |   C |   180 | 17.3 |  Coadd
   67771 | 2024-04-03 03:36:41 |         MASTER-SAAO | (16h 19m 52.88s , +25d 46m 41.7s) |   C |    60 | 18.5 |
   67831 | 2024-04-03 03:36:41 |         MASTER-SAAO | (16h 19m 52.89s , +25d 46m 41.7s) |   C |   180 | 17.4 |  Coadd
   68729 | 2024-04-03 03:52:39 |         MASTER-SAAO | (16h 18m 01.18s , +26d 01m 18.6s) |   C |    60 | 17.8 |
   68729 | 2024-04-03 03:52:39 |         MASTER-SAAO | (16h 19m 56.33s , +25d 48m 07.4s) |   C |    60 | 18.2 |
   69688 | 2024-04-03 04:08:39 |         MASTER-SAAO | (16h 18m 00.35s , +26d 02m 44.4s) |   C |    60 | 16.0 |
   69688 | 2024-04-03 04:08:39 |         MASTER-SAAO | (16h 19m 55.57s , +25d 49m 31.9s) |   C |    60 | 16.1 |
  114741 | 2024-04-03 16:39:47 |        MASTER-Tunka | (16h 21m 42.47s , +25d 05m 39.5s) |   C |    30 | 18.5 |
  114742 | 2024-04-03 16:39:47 |        MASTER-Tunka | (16h 22m 52.93s , +25d 47m 55.4s) |   C |    30 | 19.0 |
  114772 | 2024-04-03 16:39:47 |        MASTER-Tunka | (16h 22m 52.93s , +25d 47m 55.4s) |   C |    90 | 19.7 |  Coadd
  114783 | 2024-04-03 16:40:28 |         MASTER-Amur | (16h 23m 12.57s , +25d 41m 12.4s) |   C |    30 | 18.4 |
  114783 | 2024-04-03 16:40:28 |         MASTER-Amur | (16h 22m 57.71s , +26d 02m 22.2s) |   C |    30 | 17.4 |
  114816 | 2024-04-03 16:41:02 |        MASTER-Tunka | (16h 21m 36.76s , +25d 04m 43.0s) |   C |    30 | 18.6 |
  114817 | 2024-04-03 16:41:02 |        MASTER-Tunka | (16h 22m 47.20s , +25d 46m 58.9s) |   C |    30 | 19.1 |
  114846 | 2024-04-03 16:41:32 |         MASTER-Amur | (16h 23m 07.00s , +25d 40m 05.4s) |   C |    30 | 18.4 |
  114846 | 2024-04-03 16:41:32 |         MASTER-Amur | (16h 22m 52.04s , +26d 01m 14.7s) |   C |    30 | 17.2 |
  114891 | 2024-04-03 16:42:16 |        MASTER-Tunka | (16h 21m 42.59s , +25d 05m 02.4s) |   C |    30 | 18.5 |
  114891 | 2024-04-03 16:42:16 |        MASTER-Tunka | (16h 22m 53.03s , +25d 47m 18.5s) |   C |    30 | 19.2 |
  114910 | 2024-04-03 16:42:36 |         MASTER-Amur | (16h 22m 57.77s , +26d 01m 20.4s) |   C |    30 | 17.3 |
  114910 | 2024-04-03 16:42:36 |         MASTER-Amur | (16h 23m 12.81s , +25d 40m 11.5s) |   C |    30 | 18.5 |
  114960 | 2024-04-03 16:43:25 |        MASTER-Tunka | (16h 21m 39.39s , +25d 06m 34.5s) |   C |    30 | 18.4 |
  114960 | 2024-04-03 16:43:26 |        MASTER-Tunka | (16h 22m 49.83s , +25d 48m 50.6s) |   C |    30 | 19.0 |
  114990 | 2024-04-03 16:43:26 |        MASTER-Tunka | (16h 22m 49.83s , +25d 48m 50.7s) |   C |    90 | 19.4 |  Coadd
  114973 | 2024-04-03 16:43:39 |         MASTER-Amur | (16h 23m 09.88s , +25d 41m 33.3s) |   C |    30 | 18.5 |
  114973 | 2024-04-03 16:43:39 |         MASTER-Amur | (16h 22m 54.77s , +26d 02m 41.6s) |   C |    30 | 17.4 |
  115036 | 2024-04-03 16:44:42 |         MASTER-Amur | (16h 23m 10.10s , +25d 40m 13.1s) |   C |    30 | 18.5 |
  115037 | 2024-04-03 16:44:42 |         MASTER-Amur | (16h 22m 54.96s , +26d 01m 20.9s) |   C |    30 | 17.3 |
  115038 | 2024-04-03 16:44:44 |        MASTER-Tunka | (16h 21m 39.42s , +25d 05m 05.1s) |   C |    30 | 18.2 |
  115038 | 2024-04-03 16:44:44 |        MASTER-Tunka | (16h 22m 49.83s , +25d 47m 21.3s) |   C |    30 | 18.8 |
  115100 | 2024-04-03 16:45:46 |         MASTER-Amur | (16h 23m 12.16s , +25d 41m 27.8s) |   C |    30 | 18.4 |
  115100 | 2024-04-03 16:45:46 |         MASTER-Amur | (16h 22m 56.99s , +26d 02m 35.4s) |   C |    30 | 17.4 |
  115113 | 2024-04-03 16:45:58 |        MASTER-Tunka | (16h 21m 43.49s , +25d 06m 49.9s) |   C |    30 | 18.3 |
  115113 | 2024-04-03 16:45:59 |        MASTER-Tunka | (16h 22m 53.89s , +25d 49m 05.9s) |   C |    30 | 18.8 |
  115163 | 2024-04-03 16:46:49 |         MASTER-Amur | (16h 23m 07.27s , +25d 40m 36.5s) |   C |    30 | 18.5 |
  115163 | 2024-04-03 16:46:49 |         MASTER-Amur | (16h 22m 52.06s , +26d 01m 43.8s) |   C |    30 | 17.3 |
  115189 | 2024-04-03 16:47:14 |        MASTER-Tunka | (16h 21m 35.99s , +25d 05m 59.2s) |   C |    30 | 18.3 |
  115189 | 2024-04-03 16:47:15 |        MASTER-Tunka | (16h 22m 46.37s , +25d 48m 15.2s) |   C |    30 | 18.8 |
  115219 | 2024-04-03 16:47:15 |        MASTER-Tunka | (16h 22m 46.37s , +25d 48m 15.2s) |   C |    90 | 19.3 |  Coadd

View this GCN Circular online at https://gcn.nasa.gov/circulars/36019.
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