MASTER Net MASTER Database: LIGO S230601bf alert (last error box)

Please use the reference to MASTER DataBase as Lipunov et al., 2010, MASTER Robotic Net, Advances in Astronomy, vol. 2010, p.30L

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Name LVC S230601bf
GCN Circulars | GCN Notices | GraceDB | VOEvents
Type 150 (last error box)
Trigger time 2023-06-01 22:41:34
Notice time 2023-06-02 13:42:05.346719
Distance 3578.45 ± 998.128 Mpc
BNS BHH NSBH Gap Terr
0 99 0 0 0
Galaxy in: 50%
90%
FULL

This work was supported by RFBR BRICS 17-52-80133 grant.
Kislovodsk Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
Amur Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
Tunka Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
OAFA Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
IAC Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
SAAO Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
Tavrida Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
OAGH Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)

DAYS:
Coverage since triggertime up to

ALL PLOTS
datetime T - Trig [h] T - Not [h] Area [sq. deg]
Box 50% 90% FULL
[%] 11.1 7.6 7.3
2023-06-15 22:41:34 336.0 321.0 291.3

Map with WFC

Discoveries in this field
No discoveries yet!

Synchronous WFC images
datetime coord2000 observatory camera links
2023-06-01 22:41:12.145 16h 03m 11.00s -31d 05m 00.0s SAAO 111341 Database SAAO
2023-06-01 22:41:01.17 15h 45m 26.00s -31d 05m 57.0s OAFA 111342 Database OAFA
2023-06-01 22:39:33.941 16h 03m 11.00s -31d 04m 59.0s SAAO 136956 Database SAAO
Errorbox center visibility at MASTER facilities
SELECT set_sphere_output('HMS'); select set_sphere_output_precision(1); select distinct on (gn) get_grb_name2 (grbtime, satel ) as gn, coord2000, satel, errorbox, 'now'::timestamp,'now'::timestamp+'1 hour'::interval,grbtime+'1 hour'::interval from grb where tabs(grbtime-'2023-06-01 22:41:34')<'10 minutes'::interval order by gn,seq desc,errorbox asc;
trigger notice notice+1hr now

2025-04-11 05:59:57 (JD 2460776.749965)

Siderial time 21.821107 h

Ra 00:00:00.00 Dec 03:00:00.00
( 0.000000d, 3.000000d)

Rise 2025-04-11 04:49:40

Transit 2025-04-11 11:10:19

Set 2025-04-11 17:30:59

Amur

Object: Altitude: 22.70 Azimuth: 65.46

Sun: Altitude: 37.73 Azimuth: 49.68

Moon: Altitude: -22.21 Azimuth: 242.88

Tunka

Object: Altitude: 34.08 Azimuth: 40.73

Sun: Altitude: 45.17 Azimuth: 18.59

Moon: Altitude: -33.10 Azimuth: 218.05

Kislovodsk

Object: Altitude: 42.41 Azimuth: 320.92

Sun: Altitude: 35.69 Azimuth: 296.22

Moon: Altitude: -40.07 Azimuth: 140.03

Tavrida

Object: Altitude: 37.50 Azimuth: 311.85

Sun: Altitude: 29.70 Azimuth: 289.34

Moon: Altitude: -35.10 Azimuth: 131.26

SAAO

Object: Altitude: 31.32 Azimuth: 242.72

Sun: Altitude: 12.74 Azimuth: 251.43

Moon: Altitude: -31.20 Azimuth: 65.57

IAC

Object: Altitude: 4.23 Azimuth: 268.87

Sun: Altitude: -10.27 Azimuth: 254.69

Moon: Altitude: -1.91 Azimuth: 89.64

Argentina

Object: Altitude: -42.39 Azimuth: 298.86

Sun: Altitude: -59.60 Azimuth: 316.18

Moon: Altitude: 42.41 Azimuth: 122.16

Mexico

Object: Altitude: -55.94 Azimuth: 178.78

Sun: Altitude: -46.10 Azimuth: 150.29

Moon: Altitude: 57.65 Azimuth: 355.59

Ural

Object: Altitude: 35.29 Azimuth: 346.80

Sun: Altitude: 35.83 Azimuth: 321.86

Moon: Altitude: -33.31 Azimuth: 165.07

Vostryakovo

Object: Altitude: 31.44 Azimuth: 321.04

Sun: Altitude: 27.63 Azimuth: 298.15

Moon: Altitude: -29.18 Azimuth: 139.98

Gal. latitude: -57.386646 Gal. longitude: 99.850285

Dist. to Sun: 20.239513

Dist. to Moon: 177.560023

Moon coord.: (181.675033 d, -1.224672 d)

Sun coord.: (19.638366 d, 8.293711 d)

Lunar disk: 0.972273

Lunar phase: 19.170545

Lunar bright limb: 292.128118

No SN in this field

2025-04-11 05:59:58 (JD 2460776.749977)

Siderial time 21.821386 h

Ra 00:00:00.00 Dec 03:00:00.00
( 0.000000d, 3.000000d)

Rise 2025-04-11 04:49:40

Transit 2025-04-11 11:10:19

Set 2025-04-11 17:30:59

Amur

Object: Altitude: 22.70 Azimuth: 65.47

Sun: Altitude: 37.73 Azimuth: 49.68

Moon: Altitude: -22.21 Azimuth: 242.88

Tunka

Object: Altitude: 34.08 Azimuth: 40.74

Sun: Altitude: 45.17 Azimuth: 18.59

Moon: Altitude: -33.10 Azimuth: 218.05

Kislovodsk

Object: Altitude: 42.42 Azimuth: 320.93

Sun: Altitude: 35.70 Azimuth: 296.22

Moon: Altitude: -40.07 Azimuth: 140.04

Tavrida

Object: Altitude: 37.50 Azimuth: 311.85

Sun: Altitude: 29.70 Azimuth: 289.35

Moon: Altitude: -35.11 Azimuth: 131.27

SAAO

Object: Altitude: 31.32 Azimuth: 242.71

Sun: Altitude: 12.74 Azimuth: 251.43

Moon: Altitude: -31.20 Azimuth: 65.57

IAC

Object: Altitude: 4.23 Azimuth: 268.87

Sun: Altitude: -10.27 Azimuth: 254.69

Moon: Altitude: -1.92 Azimuth: 89.64

Argentina

Object: Altitude: -42.39 Azimuth: 298.85

Sun: Altitude: -59.60 Azimuth: 316.18

Moon: Altitude: 42.41 Azimuth: 122.16

Mexico

Object: Altitude: -55.94 Azimuth: 178.78

Sun: Altitude: -46.10 Azimuth: 150.29

Moon: Altitude: 57.65 Azimuth: 355.59

Ural

Object: Altitude: 35.29 Azimuth: 346.80

Sun: Altitude: 35.83 Azimuth: 321.86

Moon: Altitude: -33.31 Azimuth: 165.08

Vostryakovo

Object: Altitude: 31.44 Azimuth: 321.05

Sun: Altitude: 27.64 Azimuth: 298.15

Moon: Altitude: -29.18 Azimuth: 139.98

Gal. latitude: -57.386646 Gal. longitude: 99.850285

Dist. to Sun: 20.239524

Dist. to Moon: 177.559988

Moon coord.: (181.675155 d, -1.224739 d)

Sun coord.: (19.638376 d, 8.293715 d)

Lunar disk: 0.972273

Lunar phase: 19.170419

Lunar bright limb: 292.128071

No SN in this field

2025-04-11 05:59:58 (JD 2460776.749977)

Siderial time 21.821386 h

Ra 00:00:00.00 Dec 03:00:00.00
( 0.000000d, 3.000000d)

Rise 2025-04-11 04:49:40

Transit 2025-04-11 11:10:19

Set 2025-04-11 17:30:59

Amur

Object: Altitude: 22.70 Azimuth: 65.47

Sun: Altitude: 37.73 Azimuth: 49.68

Moon: Altitude: -22.21 Azimuth: 242.88

Tunka

Object: Altitude: 34.08 Azimuth: 40.74

Sun: Altitude: 45.17 Azimuth: 18.59

Moon: Altitude: -33.10 Azimuth: 218.05

Kislovodsk

Object: Altitude: 42.42 Azimuth: 320.93

Sun: Altitude: 35.70 Azimuth: 296.22

Moon: Altitude: -40.07 Azimuth: 140.04

Tavrida

Object: Altitude: 37.50 Azimuth: 311.85

Sun: Altitude: 29.70 Azimuth: 289.35

Moon: Altitude: -35.11 Azimuth: 131.27

SAAO

Object: Altitude: 31.32 Azimuth: 242.71

Sun: Altitude: 12.74 Azimuth: 251.43

Moon: Altitude: -31.20 Azimuth: 65.57

IAC

Object: Altitude: 4.23 Azimuth: 268.87

Sun: Altitude: -10.27 Azimuth: 254.69

Moon: Altitude: -1.92 Azimuth: 89.64

Argentina

Object: Altitude: -42.39 Azimuth: 298.85

Sun: Altitude: -59.60 Azimuth: 316.18

Moon: Altitude: 42.41 Azimuth: 122.16

Mexico

Object: Altitude: -55.94 Azimuth: 178.78

Sun: Altitude: -46.10 Azimuth: 150.29

Moon: Altitude: 57.65 Azimuth: 355.59

Ural

Object: Altitude: 35.29 Azimuth: 346.80

Sun: Altitude: 35.83 Azimuth: 321.86

Moon: Altitude: -33.31 Azimuth: 165.08

Vostryakovo

Object: Altitude: 31.44 Azimuth: 321.05

Sun: Altitude: 27.64 Azimuth: 298.15

Moon: Altitude: -29.18 Azimuth: 139.98

Gal. latitude: -57.386646 Gal. longitude: 99.850285

Dist. to Sun: 20.239524

Dist. to Moon: 177.559988

Moon coord.: (181.675155 d, -1.224739 d)

Sun coord.: (19.638376 d, 8.293715 d)

Lunar disk: 0.972273

Lunar phase: 19.170419

Lunar bright limb: 292.128071

No SN in this field

2025-04-11 05:59:59 (JD 2460776.749988)

Siderial time 21.821664 h

Ra 00:00:00.00 Dec 03:00:00.00
( 0.000000d, 3.000000d)

Rise 2025-04-11 04:49:40

Transit 2025-04-11 11:10:19

Set 2025-04-11 17:30:59

Amur

Object: Altitude: 22.69 Azimuth: 65.47

Sun: Altitude: 37.73 Azimuth: 49.69

Moon: Altitude: -22.20 Azimuth: 242.88

Tunka

Object: Altitude: 34.08 Azimuth: 40.74

Sun: Altitude: 45.17 Azimuth: 18.60

Moon: Altitude: -33.10 Azimuth: 218.05

Kislovodsk

Object: Altitude: 42.42 Azimuth: 320.93

Sun: Altitude: 35.70 Azimuth: 296.23

Moon: Altitude: -40.07 Azimuth: 140.04

Tavrida

Object: Altitude: 37.50 Azimuth: 311.86

Sun: Altitude: 29.70 Azimuth: 289.35

Moon: Altitude: -35.11 Azimuth: 131.27

SAAO

Object: Altitude: 31.32 Azimuth: 242.71

Sun: Altitude: 12.74 Azimuth: 251.43

Moon: Altitude: -31.20 Azimuth: 65.56

IAC

Object: Altitude: 4.23 Azimuth: 268.87

Sun: Altitude: -10.27 Azimuth: 254.69

Moon: Altitude: -1.92 Azimuth: 89.64

Argentina

Object: Altitude: -42.38 Azimuth: 298.85

Sun: Altitude: -59.60 Azimuth: 316.17

Moon: Altitude: 42.40 Azimuth: 122.15

Mexico

Object: Altitude: -55.94 Azimuth: 178.79

Sun: Altitude: -46.10 Azimuth: 150.30

Moon: Altitude: 57.65 Azimuth: 355.60

Ural

Object: Altitude: 35.29 Azimuth: 346.81

Sun: Altitude: 35.84 Azimuth: 321.87

Moon: Altitude: -33.31 Azimuth: 165.08

Vostryakovo

Object: Altitude: 31.44 Azimuth: 321.05

Sun: Altitude: 27.64 Azimuth: 298.16

Moon: Altitude: -29.18 Azimuth: 139.99

Gal. latitude: -57.386646 Gal. longitude: 99.850285

Dist. to Sun: 20.239535

Dist. to Moon: 177.559953

Moon coord.: (181.675276 d, -1.224805 d)

Sun coord.: (19.638387 d, 8.293719 d)

Lunar disk: 0.972273

Lunar phase: 19.170293

Lunar bright limb: 292.128024

No SN in this field
Recent coverage and limits telegrams
#######################################################################################
#######################################################################################

  ID = 8223
TYPE = 34
DAYS = 0


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 LVC S230601bf errorbox 86 sec after trigger time at 2023-06-01 22:43:00 UT, with upper limit up to  19.5 mag. The observations began at zenith distance = 45 deg. The sun  altitude  is -80.0 deg. 

MASTER-OAFA robotic telescope  located in Argentina (OAFA observatory of San Juan National University) started inspect of the LVC S230601bf errorbox 543 sec after trigger time at 2023-06-01 22:50:37 UT, with upper limit up to  16.9 mag. Observations started at twilight.  The observations began at zenith distance = 73 deg. The sun  altitude  is -14.9 deg. 

The galactic latitude b = 19 deg., longitude l = 197 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/ligo_1.php?id=11922

We obtain a following upper limits.  

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

      92 | 2023-06-01 22:43:00 |         MASTER-SAAO | (20h 25m 56.59s , -39d 52m 05.8s) |   C |    10 | 17.2 |        
     117 | 2023-06-01 22:43:00 |         MASTER-SAAO | (20h 25m 56.59s , -39d 52m 05.8s) |   C |    60 | 18.4 |  Coadd 
      92 | 2023-06-01 22:43:00 |         MASTER-SAAO | (20h 24m 51.97s , -39d 51m 33.9s) |   C |    10 | 17.3 |        
     117 | 2023-06-01 22:43:00 |         MASTER-SAAO | (20h 24m 51.97s , -39d 51m 33.9s) |   C |    60 | 18.4 |  Coadd 
     126 | 2023-06-01 22:43:29 |         MASTER-SAAO | (20h 26m 02.38s , -39d 51m 46.0s) |   C |    20 | 17.7 |        
     126 | 2023-06-01 22:43:29 |         MASTER-SAAO | (20h 24m 57.73s , -39d 51m 14.1s) |   C |    20 | 17.7 |        
     182 | 2023-06-01 22:44:20 |         MASTER-SAAO | (20h 25m 59.84s , -39d 50m 18.5s) |   C |    30 | 17.9 |        
     182 | 2023-06-01 22:44:20 |         MASTER-SAAO | (20h 24m 55.25s , -39d 49m 46.7s) |   C |    30 | 18.0 |        
     236 | 2023-06-01 22:45:10 |         MASTER-SAAO | (20h 25m 59.76s , -39d 51m 50.8s) |   C |    40 | 18.1 |        
     296 | 2023-06-01 22:45:10 |         MASTER-SAAO | (20h 25m 59.76s , -39d 51m 50.8s) |   C |   160 | 19.0 |  Coadd 
     236 | 2023-06-01 22:45:10 |         MASTER-SAAO | (20h 24m 55.12s , -39d 51m 18.1s) |   C |    40 | 18.2 |        
     296 | 2023-06-01 22:45:10 |         MASTER-SAAO | (20h 24m 55.12s , -39d 51m 18.2s) |   C |   160 | 19.1 |  Coadd 
     301 | 2023-06-01 22:46:09 |         MASTER-SAAO | (20h 26m 02.28s , -39d 50m 14.3s) |   C |    50 | 18.1 |        
     301 | 2023-06-01 22:46:09 |         MASTER-SAAO | (20h 24m 57.64s , -39d 49m 42.0s) |   C |    50 | 18.3 |        
     392 | 2023-06-01 22:47:30 |         MASTER-SAAO | (20h 25m 57.11s , -39d 51m 06.3s) |   C |    70 | 18.4 |        
     392 | 2023-06-01 22:47:30 |         MASTER-SAAO | (20h 24m 52.44s , -39d 50m 32.7s) |   C |    70 | 18.5 |        
     503 | 2023-06-01 22:49:11 |         MASTER-SAAO | (20h 24m 51.59s , -39d 49m 33.4s) |   C |    90 | 18.7 |        
     503 | 2023-06-01 22:49:11 |         MASTER-SAAO | (20h 25m 56.26s , -39d 50m 07.1s) |   C |    90 | 18.6 |        
     628 | 2023-06-01 22:49:11 |         MASTER-SAAO | (20h 24m 51.59s , -39d 49m 33.3s) |   C |   340 | 19.4 |  Coadd 
     628 | 2023-06-01 22:49:11 |         MASTER-SAAO | (20h 25m 56.26s , -39d 50m 07.0s) |   C |   340 | 19.5 |  Coadd 
     598 | 2023-06-01 22:50:37 |         MASTER-OAFA | (07h 28m 41.32s , +23d 12m 59.6s) |   C |   110 | 16.2 |        
     748 | 2023-06-01 22:50:37 |         MASTER-OAFA | (07h 28m 41.33s , +23d 12m 59.5s) |   C |   410 | 16.9 |  Coadd 
     623 | 2023-06-01 22:51:01 |         MASTER-SAAO | (20h 26m 02.23s , -39d 51m 08.2s) |   C |   110 | 18.6 |        
     623 | 2023-06-01 22:51:01 |         MASTER-SAAO | (20h 24m 57.50s , -39d 50m 33.1s) |   C |   110 | 18.7 |        
     750 | 2023-06-01 22:52:58 |         MASTER-OAFA | (07h 28m 46.73s , +23d 13m 32.6s) |   C |   130 | 16.1 |        
     779 | 2023-06-01 22:53:23 |         MASTER-SAAO | (20h 25m 55.86s , -39d 52m 09.6s) |   C |   140 | 18.7 |        
     779 | 2023-06-01 22:53:23 |         MASTER-SAAO | (20h 24m 51.07s , -39d 51m 33.1s) |   C |   140 | 18.8 |        
     931 | 2023-06-01 22:55:39 |         MASTER-OAFA | (07h 28m 44.45s , +23d 14m 48.4s) |   C |   170 | 16.6 |        
    1138 | 2023-06-01 22:59:01 |         MASTER-OAFA | (07h 28m 44.40s , +23d 13m 39.6s) |   C |   180 | 16.5 |        
    2232 | 2023-06-01 23:17:15 |         MASTER-OAFA | (07h 28m 43.73s , +23d 14m 28.1s) |   C |   180 | 15.8 |        
    2443 | 2023-06-01 23:20:46 |         MASTER-OAFA | (07h 28m 43.70s , +23d 13m 13.2s) |   C |   180 | 16.0 |        
Filter C is a clear (unfiltred) band. 


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



#######################################################################################
#######################################################################################

  ID = 8224
TYPE = 35
DAYS = 0


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 LVC S230601bf errorbox 86 sec after trigger time at 2023-06-01 22:43:00 UT, with upper limit up to  19.5 mag. The observations began at zenith distance = 45 deg. The sun  altitude  is -80.0 deg. 

MASTER-OAFA robotic telescope  located in Argentina (OAFA observatory of San Juan National University) started inspect of the LVC S230601bf errorbox 543 sec after trigger time at 2023-06-01 22:50:37 UT, with upper limit up to  16.9 mag. Observations started at twilight.  The observations began at zenith distance = 73 deg. The sun  altitude  is -14.9 deg. 

The galactic latitude b = 19 deg., longitude l = 197 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/ligo_1.php?id=11922

We obtain a following upper limits.  

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

      92 | 2023-06-01 22:43:00 |         MASTER-SAAO | (20h 25m 56.59s , -39d 52m 05.8s) |   C |    10 | 17.2 |        
     117 | 2023-06-01 22:43:00 |         MASTER-SAAO | (20h 25m 56.59s , -39d 52m 05.8s) |   C |    60 | 18.4 |  Coadd 
      92 | 2023-06-01 22:43:00 |         MASTER-SAAO | (20h 24m 51.97s , -39d 51m 33.9s) |   C |    10 | 17.3 |        
     117 | 2023-06-01 22:43:00 |         MASTER-SAAO | (20h 24m 51.97s , -39d 51m 33.9s) |   C |    60 | 18.4 |  Coadd 
     126 | 2023-06-01 22:43:29 |         MASTER-SAAO | (20h 26m 02.38s , -39d 51m 46.0s) |   C |    20 | 17.7 |        
     126 | 2023-06-01 22:43:29 |         MASTER-SAAO | (20h 24m 57.73s , -39d 51m 14.1s) |   C |    20 | 17.7 |        
     182 | 2023-06-01 22:44:20 |         MASTER-SAAO | (20h 25m 59.84s , -39d 50m 18.5s) |   C |    30 | 17.9 |        
     182 | 2023-06-01 22:44:20 |         MASTER-SAAO | (20h 24m 55.25s , -39d 49m 46.7s) |   C |    30 | 18.0 |        
     236 | 2023-06-01 22:45:10 |         MASTER-SAAO | (20h 25m 59.76s , -39d 51m 50.8s) |   C |    40 | 18.1 |        
     296 | 2023-06-01 22:45:10 |         MASTER-SAAO | (20h 25m 59.76s , -39d 51m 50.8s) |   C |   160 | 19.0 |  Coadd 
     236 | 2023-06-01 22:45:10 |         MASTER-SAAO | (20h 24m 55.12s , -39d 51m 18.1s) |   C |    40 | 18.2 |        
     296 | 2023-06-01 22:45:10 |         MASTER-SAAO | (20h 24m 55.12s , -39d 51m 18.2s) |   C |   160 | 19.1 |  Coadd 
     301 | 2023-06-01 22:46:09 |         MASTER-SAAO | (20h 26m 02.28s , -39d 50m 14.3s) |   C |    50 | 18.1 |        
     301 | 2023-06-01 22:46:09 |         MASTER-SAAO | (20h 24m 57.64s , -39d 49m 42.0s) |   C |    50 | 18.3 |        
     392 | 2023-06-01 22:47:30 |         MASTER-SAAO | (20h 25m 57.11s , -39d 51m 06.3s) |   C |    70 | 18.4 |        
     392 | 2023-06-01 22:47:30 |         MASTER-SAAO | (20h 24m 52.44s , -39d 50m 32.7s) |   C |    70 | 18.5 |        
     503 | 2023-06-01 22:49:11 |         MASTER-SAAO | (20h 24m 51.59s , -39d 49m 33.4s) |   C |    90 | 18.7 |        
     503 | 2023-06-01 22:49:11 |         MASTER-SAAO | (20h 25m 56.26s , -39d 50m 07.1s) |   C |    90 | 18.6 |        
     628 | 2023-06-01 22:49:11 |         MASTER-SAAO | (20h 24m 51.59s , -39d 49m 33.3s) |   C |   340 | 19.4 |  Coadd 
     628 | 2023-06-01 22:49:11 |         MASTER-SAAO | (20h 25m 56.26s , -39d 50m 07.0s) |   C |   340 | 19.5 |  Coadd 
     598 | 2023-06-01 22:50:37 |         MASTER-OAFA | (07h 28m 41.32s , +23d 12m 59.6s) |   C |   110 | 16.2 |        
     748 | 2023-06-01 22:50:37 |         MASTER-OAFA | (07h 28m 41.33s , +23d 12m 59.5s) |   C |   410 | 16.9 |  Coadd 
     623 | 2023-06-01 22:51:01 |         MASTER-SAAO | (20h 26m 02.23s , -39d 51m 08.2s) |   C |   110 | 18.6 |        
     623 | 2023-06-01 22:51:01 |         MASTER-SAAO | (20h 24m 57.50s , -39d 50m 33.1s) |   C |   110 | 18.7 |        
     750 | 2023-06-01 22:52:58 |         MASTER-OAFA | (07h 28m 46.73s , +23d 13m 32.6s) |   C |   130 | 16.1 |        
     779 | 2023-06-01 22:53:23 |         MASTER-SAAO | (20h 25m 55.86s , -39d 52m 09.6s) |   C |   140 | 18.7 |        
     779 | 2023-06-01 22:53:23 |         MASTER-SAAO | (20h 24m 51.07s , -39d 51m 33.1s) |   C |   140 | 18.8 |        
     931 | 2023-06-01 22:55:39 |         MASTER-OAFA | (07h 28m 44.45s , +23d 14m 48.4s) |   C |   170 | 16.6 |        
    1138 | 2023-06-01 22:59:01 |         MASTER-OAFA | (07h 28m 44.40s , +23d 13m 39.6s) |   C |   180 | 16.5 |        
    2232 | 2023-06-01 23:17:15 |         MASTER-OAFA | (07h 28m 43.73s , +23d 14m 28.1s) |   C |   180 | 15.8 |        
    2443 | 2023-06-01 23:20:46 |         MASTER-OAFA | (07h 28m 43.70s , +23d 13m 13.2s) |   C |   180 | 16.0 |        
Filter C is a clear (unfiltred) band. 


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



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  ID = 8225
TYPE = 35
DAYS = 0


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 LVC S230601bf errorbox 86 sec after trigger time at 2023-06-01 22:43:00 UT, with upper limit up to  19.5 mag. The observations began at zenith distance = 45 deg. The sun  altitude  is -80.0 deg. 

MASTER-OAFA robotic telescope  located in Argentina (OAFA observatory of San Juan National University) started inspect of the LVC S230601bf errorbox 543 sec after trigger time at 2023-06-01 22:50:37 UT, with upper limit up to  16.9 mag. Observations started at twilight.  The observations began at zenith distance = 73 deg. The sun  altitude  is -14.9 deg. 

The galactic latitude b = 19 deg., longitude l = 197 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/ligo_1.php?id=11922

We obtain a following upper limits.  

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

      92 | 2023-06-01 22:43:00 |         MASTER-SAAO | (20h 25m 56.59s , -39d 52m 05.8s) |   C |    10 | 17.2 |        
     117 | 2023-06-01 22:43:00 |         MASTER-SAAO | (20h 25m 56.59s , -39d 52m 05.8s) |   C |    60 | 18.4 |  Coadd 
      92 | 2023-06-01 22:43:00 |         MASTER-SAAO | (20h 24m 51.97s , -39d 51m 33.9s) |   C |    10 | 17.3 |        
     117 | 2023-06-01 22:43:00 |         MASTER-SAAO | (20h 24m 51.97s , -39d 51m 33.9s) |   C |    60 | 18.4 |  Coadd 
     126 | 2023-06-01 22:43:29 |         MASTER-SAAO | (20h 26m 02.38s , -39d 51m 46.0s) |   C |    20 | 17.7 |        
     126 | 2023-06-01 22:43:29 |         MASTER-SAAO | (20h 24m 57.73s , -39d 51m 14.1s) |   C |    20 | 17.7 |        
     182 | 2023-06-01 22:44:20 |         MASTER-SAAO | (20h 25m 59.84s , -39d 50m 18.5s) |   C |    30 | 17.9 |        
     182 | 2023-06-01 22:44:20 |         MASTER-SAAO | (20h 24m 55.25s , -39d 49m 46.7s) |   C |    30 | 18.0 |        
     236 | 2023-06-01 22:45:10 |         MASTER-SAAO | (20h 25m 59.76s , -39d 51m 50.8s) |   C |    40 | 18.1 |        
     296 | 2023-06-01 22:45:10 |         MASTER-SAAO | (20h 25m 59.76s , -39d 51m 50.8s) |   C |   160 | 19.0 |  Coadd 
     236 | 2023-06-01 22:45:10 |         MASTER-SAAO | (20h 24m 55.12s , -39d 51m 18.1s) |   C |    40 | 18.2 |        
     296 | 2023-06-01 22:45:10 |         MASTER-SAAO | (20h 24m 55.12s , -39d 51m 18.2s) |   C |   160 | 19.1 |  Coadd 
     301 | 2023-06-01 22:46:09 |         MASTER-SAAO | (20h 26m 02.28s , -39d 50m 14.3s) |   C |    50 | 18.1 |        
     301 | 2023-06-01 22:46:09 |         MASTER-SAAO | (20h 24m 57.64s , -39d 49m 42.0s) |   C |    50 | 18.3 |        
     392 | 2023-06-01 22:47:30 |         MASTER-SAAO | (20h 25m 57.11s , -39d 51m 06.3s) |   C |    70 | 18.4 |        
     392 | 2023-06-01 22:47:30 |         MASTER-SAAO | (20h 24m 52.44s , -39d 50m 32.7s) |   C |    70 | 18.5 |        
     503 | 2023-06-01 22:49:11 |         MASTER-SAAO | (20h 24m 51.59s , -39d 49m 33.4s) |   C |    90 | 18.7 |        
     503 | 2023-06-01 22:49:11 |         MASTER-SAAO | (20h 25m 56.26s , -39d 50m 07.1s) |   C |    90 | 18.6 |        
     628 | 2023-06-01 22:49:11 |         MASTER-SAAO | (20h 24m 51.59s , -39d 49m 33.3s) |   C |   340 | 19.4 |  Coadd 
     628 | 2023-06-01 22:49:11 |         MASTER-SAAO | (20h 25m 56.26s , -39d 50m 07.0s) |   C |   340 | 19.5 |  Coadd 
     598 | 2023-06-01 22:50:37 |         MASTER-OAFA | (07h 28m 41.32s , +23d 12m 59.6s) |   C |   110 | 16.2 |        
     748 | 2023-06-01 22:50:37 |         MASTER-OAFA | (07h 28m 41.33s , +23d 12m 59.5s) |   C |   410 | 16.9 |  Coadd 
     623 | 2023-06-01 22:51:01 |         MASTER-SAAO | (20h 26m 02.23s , -39d 51m 08.2s) |   C |   110 | 18.6 |        
     623 | 2023-06-01 22:51:01 |         MASTER-SAAO | (20h 24m 57.50s , -39d 50m 33.1s) |   C |   110 | 18.7 |        
     750 | 2023-06-01 22:52:58 |         MASTER-OAFA | (07h 28m 46.73s , +23d 13m 32.6s) |   C |   130 | 16.1 |        
     779 | 2023-06-01 22:53:23 |         MASTER-SAAO | (20h 25m 55.86s , -39d 52m 09.6s) |   C |   140 | 18.7 |        
     779 | 2023-06-01 22:53:23 |         MASTER-SAAO | (20h 24m 51.07s , -39d 51m 33.1s) |   C |   140 | 18.8 |        
     931 | 2023-06-01 22:55:39 |         MASTER-OAFA | (07h 28m 44.45s , +23d 14m 48.4s) |   C |   170 | 16.6 |        
    1138 | 2023-06-01 22:59:01 |         MASTER-OAFA | (07h 28m 44.40s , +23d 13m 39.6s) |   C |   180 | 16.5 |        
    2232 | 2023-06-01 23:17:15 |         MASTER-OAFA | (07h 28m 43.73s , +23d 14m 28.1s) |   C |   180 | 15.8 |        
    2443 | 2023-06-01 23:20:46 |         MASTER-OAFA | (07h 28m 43.70s , +23d 13m 13.2s) |   C |   180 | 16.0 |        
Filter C is a clear (unfiltred) band. 


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

MASTER, 2002-2025