{
  "subject": "SVOM GRB 260509A: MASTER-OAFA optical observation",
  "createdOn": 1778401396499,
  "submittedHow": "email",
  "body": "Ya.Kechin (Lomonosov MSU),\nF.Podesta, M.J. Segura, C.Francile, R.Podesta, E. Gonzalez (OAFA, SJNU),\nA.Kuznetsov, V.Lipunov, I.Panchenko, P.Balanutsa, G.Antipov, N.Tiurina,K.Zhirkov, E.Gorbovskoy, V.Senik, A.Chasovnikov, V.Topolev, D.Vlasenko,A.Sankovich, I.Gorbunov(Lomonosov MSU),\nN.Budnev, O.Gress (ISU),\nD.Buckley (SAAO),\nA. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),\nA. Gabovich  (Blagoveschensk Educational StateUniversity)\nR.Rebolo (The Instituto de Astrofisica de Canarias),\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez,J.Martinez,A.R.Corella,\nJ.Tanori, L. Villalobos, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)\n\nMASTER-OAFA robotic telescope of MASTER Global Robotic Net [1-4]\nwas pointed to the SVOM GRB260509A (trigger No 1778363469,11h 47m 32.88s , +00d 12m 34.2s, R=0.0786667 Gotz et al. GCN 44504) errorbox  8054 sec after notice time and 10202 sec after trigger time at 2026-05-10 00:41:11 UT,\nwith upper limit up to  20.5 mag. The observations began at zenith distance = 31 deg. The sun  altitude  is -36.5 deg.\n\nMASTER-OAGH robotic telescope  located in Mexico (OAGH National Institute for Astrophysics, Optics and Electronics)\nwas pointed to the SVOM GRB260509.91 errorbox  24424 sec after notice time (26572 sec after trigger time at 2026-05-10 05:14:01 UT),\n with upper limit up to  19.3 mag. The observations began at zenith distance = 36 deg. The sun  altitude  is -33.4 deg.\n\nThe galactic latitude b = 59 deg., longitude l = 272 deg.\n\nThere is MASTER OT J114735.9135.91+001717.7 optical counterpart at first images with m_OT~20.9 at 2026-05-10 00:41:11UT\ndiscovered by GOTO (O'Neill et al. GCN 44505)\nand observed by LCO (Saccardi et al. GCN 44506), SVOM|VT (Wu et al. GCN 44507), KAIT (Zheng et al. GCN 44510)\n\nReal time updated cover map and OT are available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id=3303991\n\nMASTER upper limits:\n\nTmid-T0  |      Date Time      |          Site       |             Coord J2000)          |Filt.| Expt. | Limit| Comment\n   10233 | 2026-05-10 00:41:11 |         MASTER-OAFA | (11h 44m 48.88s , -00d 51m 54.0s) |   C |    60 | 20.2 |\n   10293 | 2026-05-10 00:41:11 |         MASTER-OAFA | (11h 44m 48.87s , -00d 51m 54.0s) |   C |   180 | 20.5 |  Coadd\n   10311 | 2026-05-10 00:42:29 |         MASTER-OAFA | (11h 44m 48.21s , -00d 50m 56.7s) |   C |    60 | 20.2 |\n   10389 | 2026-05-10 00:43:47 |         MASTER-OAFA | (11h 44m 52.24s , -00d 51m 59.4s) |   C |    60 | 20.2 |\n   10465 | 2026-05-10 00:45:03 |         MASTER-OAFA | (11h 44m 46.21s , -00d 53m 02.8s) |   C |    60 | 20.2 |\n   10525 | 2026-05-10 00:45:03 |         MASTER-OAFA | (11h 44m 46.20s , -00d 53m 02.8s) |   C |   180 | 20.5 |  Coadd\n   10540 | 2026-05-10 00:46:19 |         MASTER-OAFA | (11h 44m 52.06s , -00d 52m 51.7s) |   C |    60 | 20.2 |\n   10618 | 2026-05-10 00:47:36 |         MASTER-OAFA | (11h 44m 49.58s , -00d 51m 21.4s) |   C |    60 | 20.2 |\n   10697 | 2026-05-10 00:48:55 |         MASTER-OAFA | (11h 44m 49.29s , -00d 53m 05.6s) |   C |    60 | 20.2 |\n   10757 | 2026-05-10 00:48:55 |         MASTER-OAFA | (11h 44m 49.28s , -00d 53m 05.6s) |   C |   180 | 20.4 |  Coadd\n   10774 | 2026-05-10 00:50:12 |         MASTER-OAFA | (11h 44m 52.95s , -00d 51m 27.6s) |   C |    60 | 20.2 |\n   10852 | 2026-05-10 00:51:31 |         MASTER-OAFA | (11h 44m 45.40s , -00d 52m 20.8s) |   C |    60 | 20.2 |\n   10930 | 2026-05-10 00:52:48 |         MASTER-OAFA | (11h 44m 45.82s , -00d 51m 24.8s) |   C |    60 | 20.2 |\n   10990 | 2026-05-10 00:52:48 |         MASTER-OAFA | (11h 44m 45.81s , -00d 51m 24.8s) |   C |   180 | 20.4 |  Coadd\n   11007 | 2026-05-10 00:54:06 |         MASTER-OAFA | (11h 44m 49.85s , -00d 52m 28.2s) |   C |    60 | 20.2 |\n   11086 | 2026-05-10 00:55:24 |         MASTER-OAFA | (11h 44m 45.55s , -00d 53m 32.1s) |   C |    60 | 20.2 |\n   11160 | 2026-05-10 00:56:39 |         MASTER-OAFA | (11h 44m 49.59s , -00d 53m 31.6s) |   C |    60 | 20.2 |\n   11220 | 2026-05-10 00:56:39 |         MASTER-OAFA | (11h 44m 49.59s , -00d 53m 31.6s) |   C |   180 | 20.4 |  Coadd\n\n[1] Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L\n[2] Lipunov et al. 2022, Universe, Vol. 8(5), id.271\n[3] Lipunov et a. 2019, ARep, vol.63, 293\n[4] Lipunov et al. 2023, Astronomical Robotic Networks and Operative Multichanel\nAstrophysics,Lomonosov MSU PRESS, 591pp.\n http://www.pereplet.ru/lipunov/625.html#625\n",
  "circularId": 44512,
  "eventId": "GRB 260509A",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>"
}