MASTER Net MASTER Database: GRB250520.11 page

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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GRB coord: ErrorBox (deg): Sys Error (deg):
Sattel : Trigger: Notice:
GRB_Name: trignum: Nights after: FullSky


Name SWIFT GRB250520.11
Trignum 1315630
Trigger time 2025-05-20 02:42:16.84
Notice time 2025-05-20 02:42:39.883756
Coord, eb (18h 49m 04.32s , -11d 50m 49.2s) , 0.05
Max dist: 1 sigma 3 sigma
AGN candidates: Milliquas
r90wise
wiseXgaia
BL Lac candidates: 1 Sigma
3 Sigma

MASTER observatories and transients from them in error-field
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)

You are viewing outdated information, relevant error box is here

All alerts for this trigger
id noticetime coord2000 satel errorbox type trigger seq trig_type links
2876897 2025-05-21 03:36:59.45406 18h 49m 14.74s -11d 52m 19.9s SWIFT 0 pointdir 1315630 138 83 pointdir
2875881 2025-05-20 02:45:39.591122 18h 49m 02.28s -11d 50m 17.5s SWIFT 0 alert 1315630 2 68 alert
2875899 2025-05-20 03:03:21.033111 18h 49m 08.66s -11d 52m 08.4s SWIFT 0.0005 alert 1315630 2 67 alert
2875878 2025-05-20 02:43:01.317067 18h 49m 04.34s -11d 50m 48.5s SWIFT 0.05 alert 1315630 1 61 alert

DAYS:

MASTER optical transients in this field
Will be published in GCN, ATEL

Synchronous WFC images
Distance datetime coord2000 observatory camera links
Errorbox center visibility at MASTER facilities
trigger notice notice+1hr now

2025-05-20 02:42:16 (JD 2460815.612685)

Siderial time 21.080047 h

Ra 18:49:04.32 Dec -11:50:49.20
(282.268000d, -11.847000d)

Rise 2025-05-20 22:31:13

Transit 2025-05-20 03:26:54

Set 2025-05-20 08:18:38

Amur

Object: Altitude: -30.37 Azimuth: 109.49

Sun: Altitude: 58.46 Azimuth: 340.49

Moon: Altitude: -5.18 Azimuth: 71.25

Tunka

Object: Altitude: -15.07 Azimuth: 89.91

Sun: Altitude: 48.02 Azimuth: 306.03

Moon: Altitude: 7.58 Azimuth: 51.96

Kislovodsk

Object: Altitude: 24.13 Azimuth: 42.26

Sun: Altitude: 9.71 Azimuth: 251.63

Moon: Altitude: 30.08 Azimuth: 353.02

Tavrida

Object: Altitude: 27.11 Azimuth: 33.73

Sun: Altitude: 4.38 Azimuth: 246.07

Moon: Altitude: 27.90 Azimuth: 343.88

SAAO

Object: Altitude: 64.13 Azimuth: 138.65

Sun: Altitude: -33.22 Azimuth: 266.13

Moon: Altitude: 59.76 Azimuth: 243.66

IAC

Object: Altitude: 45.35 Azimuth: 331.26

Sun: Altitude: -35.92 Azimuth: 209.73

Moon: Altitude: 12.93 Azimuth: 296.29

Argentina

Object: Altitude: 20.56 Azimuth: 271.46

Sun: Altitude: -62.65 Azimuth: 71.01

Moon: Altitude: -13.94 Azimuth: 299.08

Mexico

Object: Altitude: -26.61 Azimuth: 268.08

Sun: Altitude: -6.79 Azimuth: 118.20

Moon: Altitude: -65.71 Azimuth: 236.17

Ural

Object: Altitude: 7.28 Azimuth: 54.74

Sun: Altitude: 22.75 Azimuth: 268.11

Moon: Altitude: 16.52 Azimuth: 10.77

Vostryakovo

Object: Altitude: 16.94 Azimuth: 35.02

Sun: Altitude: 10.63 Azimuth: 250.18

Moon: Altitude: 18.12 Azimuth: 348.88

Gal. latitude: -5.437018 Gal. longitude: 22.458412

Dist. to Sun: 135.642263

Dist. to Moon: 43.906945

Moon coord.: (327.383610 d, -15.897591 d)

Sun coord.: (56.778552 d, 19.942391 d)

Lunar disk: 0.543316

Lunar phase: 85.030180

Lunar bright limb: 70.587535

No SN in this field

2025-05-20 02:42:39 (JD 2460815.612951)

Siderial time 21.086454 h

Ra 18:49:04.32 Dec -11:50:49.20
(282.268000d, -11.847000d)

Rise 2025-05-20 22:31:13

Transit 2025-05-20 03:26:54

Set 2025-05-20 08:18:38

Amur

Object: Altitude: -30.43 Azimuth: 109.58

Sun: Altitude: 58.48 Azimuth: 340.65

Moon: Altitude: -5.24 Azimuth: 71.32

Tunka

Object: Altitude: -15.13 Azimuth: 89.98

Sun: Altitude: 48.07 Azimuth: 306.14

Moon: Altitude: 7.54 Azimuth: 52.04

Kislovodsk

Object: Altitude: 24.08 Azimuth: 42.35

Sun: Altitude: 9.78 Azimuth: 251.69

Moon: Altitude: 30.09 Azimuth: 353.12

Tavrida

Object: Altitude: 27.07 Azimuth: 33.82

Sun: Altitude: 4.45 Azimuth: 246.14

Moon: Altitude: 27.92 Azimuth: 343.98

SAAO

Object: Altitude: 64.08 Azimuth: 138.48

Sun: Altitude: -33.14 Azimuth: 266.08

Moon: Altitude: 59.83 Azimuth: 243.55

IAC

Object: Altitude: 45.39 Azimuth: 331.39

Sun: Altitude: -35.88 Azimuth: 209.83

Moon: Altitude: 13.01 Azimuth: 296.34

Argentina

Object: Altitude: 20.64 Azimuth: 271.41

Sun: Altitude: -62.73 Azimuth: 70.91

Moon: Altitude: -13.88 Azimuth: 299.02

Mexico

Object: Altitude: -26.52 Azimuth: 268.13

Sun: Altitude: -6.86 Azimuth: 118.26

Moon: Altitude: -65.64 Azimuth: 236.31

Ural

Object: Altitude: 7.23 Azimuth: 54.83

Sun: Altitude: 22.81 Azimuth: 268.19

Moon: Altitude: 16.51 Azimuth: 10.87

Vostryakovo

Object: Altitude: 16.91 Azimuth: 35.12

Sun: Altitude: 10.68 Azimuth: 250.26

Moon: Altitude: 18.13 Azimuth: 348.97

Gal. latitude: -5.437018 Gal. longitude: 22.458412

Dist. to Sun: 135.642509

Dist. to Moon: 43.910208

Moon coord.: (327.386985 d, -15.896147 d)

Sun coord.: (56.778818 d, 19.942447 d)

Lunar disk: 0.543287

Lunar phase: 85.033460

Lunar bright limb: 70.586603

No SN in this field

2025-05-20 03:42:39 (JD 2460815.654618)

Siderial time 22.089192 h

Ra 18:49:04.32 Dec -11:50:49.20
(282.268000d, -11.847000d)

Rise 2025-05-20 22:31:13

Transit 2025-05-20 03:26:54

Set 2025-05-20 08:18:38

Amur

Object: Altitude: -38.99 Azimuth: 124.19

Sun: Altitude: 59.43 Azimuth: 8.12

Moon: Altitude: -14.07 Azimuth: 82.30

Tunka

Object: Altitude: -24.36 Azimuth: 102.19

Sun: Altitude: 54.51 Azimuth: 326.31

Moon: Altitude: 0.13 Azimuth: 63.91

Kislovodsk

Object: Altitude: 15.89 Azimuth: 55.39

Sun: Altitude: 20.31 Azimuth: 261.41

Moon: Altitude: 30.10 Azimuth: 9.28

Tavrida

Object: Altitude: 20.07 Azimuth: 47.97

Sun: Altitude: 14.53 Azimuth: 256.14

Moon: Altitude: 29.60 Azimuth: 359.80

SAAO

Object: Altitude: 53.98 Azimuth: 117.32

Sun: Altitude: -20.59 Azimuth: 258.85

Moon: Altitude: 69.34 Azimuth: 219.17

IAC

Object: Altitude: 49.56 Azimuth: 352.36

Sun: Altitude: -27.94 Azimuth: 223.59

Moon: Altitude: 24.13 Azimuth: 305.26

Argentina

Object: Altitude: 33.40 Azimuth: 263.13

Sun: Altitude: -73.73 Azimuth: 46.23

Moon: Altitude: -2.81 Azimuth: 290.40

Mexico

Object: Altitude: -13.66 Azimuth: 275.76

Sun: Altitude: -17.65 Azimuth: 127.55

Moon: Altitude: -54.24 Azimuth: 252.74

Ural

Object: Altitude: 0.07 Azimuth: 67.72

Sun: Altitude: 30.93 Azimuth: 281.13

Moon: Altitude: 14.29 Azimuth: 25.17

Vostryakovo

Object: Altitude: 11.18 Azimuth: 49.10

Sun: Altitude: 18.94 Azimuth: 262.08

Moon: Altitude: 18.88 Azimuth: 3.68

Gal. latitude: -5.437018 Gal. longitude: 22.458412

Dist. to Sun: 135.681056

Dist. to Moon: 44.421589

Moon coord.: (327.914884 d, -15.669486 d)

Sun coord.: (56.820444 d, 19.951183 d)

Lunar disk: 0.538818

Lunar phase: 85.547274

Lunar bright limb: 70.442006

No SN in this field

2025-05-21 09:03:59 (JD 2460816.877766)

Siderial time 3.525120 h

Ra 18:49:04.32 Dec -11:50:49.20
(282.268000d, -11.847000d)

Rise 2025-05-21 22:27:17

Transit 2025-05-21 03:22:58

Set 2025-05-21 08:14:42

Amur

Object: Altitude: -39.30 Azimuth: 235.18

Sun: Altitude: 18.73 Azimuth: 99.34

Moon: Altitude: -44.78 Azimuth: 150.83

Tunka

Object: Altitude: -47.98 Azimuth: 203.85

Sun: Altitude: 33.99 Azimuth: 79.43

Moon: Altitude: -33.25 Azimuth: 123.40

Kislovodsk

Object: Altitude: -40.27 Azimuth: 116.00

Sun: Altitude: 66.46 Azimuth: 359.38

Moon: Altitude: 5.10 Azimuth: 73.21

Tavrida

Object: Altitude: -34.26 Azimuth: 108.98

Sun: Altitude: 64.42 Azimuth: 340.65

Moon: Altitude: 10.50 Azimuth: 66.86

SAAO

Object: Altitude: -12.92 Azimuth: 66.74

Sun: Altitude: 33.37 Azimuth: 204.87

Moon: Altitude: 35.65 Azimuth: 103.98

IAC

Object: Altitude: 5.98 Azimuth: 73.09

Sun: Altitude: 35.85 Azimuth: 264.56

Moon: Altitude: 50.34 Azimuth: 24.53

Argentina

Object: Altitude: 60.46 Azimuth: 127.18

Sun: Altitude: -28.83 Azimuth: 262.96

Moon: Altitude: 48.25 Azimuth: 244.14

Mexico

Object: Altitude: 43.96 Azimuth: 336.02

Sun: Altitude: -32.64 Azimuth: 210.20

Moon: Altitude: 5.50 Azimuth: 283.27

Ural

Object: Altitude: -40.15 Azimuth: 143.80

Sun: Altitude: 51.14 Azimuth: 25.55

Moon: Altitude: -7.91 Azimuth: 86.72

Vostryakovo

Object: Altitude: -32.16 Azimuth: 118.94

Sun: Altitude: 54.62 Azimuth: 351.92

Moon: Altitude: 4.19 Azimuth: 68.63

Gal. latitude: -5.437018 Gal. longitude: 22.458412

Dist. to Sun: 136.811372

Dist. to Moon: 59.984682

Moon coord.: (343.212654 d, -8.412991 d)

Sun coord.: (58.044183 d, 20.203236 d)

Lunar disk: 0.405243

Lunar phase: 100.924404

Lunar bright limb: 67.363562

No SN in this field
Recent coverage and limits telegrams

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

  ID = 12579
TYPE = 35
DAYS = 1


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) was pointed to the SWIFT GRB 250520A ( R. A. J. Eyles-Ferris et al., GCN 40491) errorbox  23 sec after notice time and 46 sec after trigger time at 2025-05-20 02:43:03 UT, with upper limit up to  17.2 mag. The observations began at zenith distance = 25 deg. The sun  altitude  is -33.7 deg. 

MASTER-OAFA robotic telescope  located in Argentina (OAFA observatory of San Juan National University) was pointed to the SWIFT GRB 250520A errorbox  2131 sec after notice time and 2155 sec after trigger time at 2025-05-20 03:18:11 UT, with upper limit up to  17.8 mag. The observations began at zenith distance = 62 deg. The sun  altitude  is -70.2 deg. 

MASTER-Tunka robotic telescope  located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the SWIFT GRB 250520A errorbox  56422 sec after notice time and 56445 sec after trigger time at 2025-05-20 18:23:02 UT, with upper limit up to  17.3 mag. Observations started at twilight.  The observations began at zenith distance = 67 deg. The sun  altitude  is -16.8 deg. 

The galactic latitude b = -5 deg., longitude l = 22 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2875870

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

      52 |         MASTER-SAAO |   C |    10 | 16.3 |        
      67 |         MASTER-SAAO |   C |    40 | 16.8 |  Coadd 
     457 |         MASTER-SAAO |   C |   820 | 17.3 |  Coadd 
      80 |         MASTER-SAAO |   C |    10 | 16.3 |        
     115 |         MASTER-SAAO |   C |    20 | 16.4 |        
     159 |         MASTER-SAAO |   C |    30 | 16.7 |        
     204 |         MASTER-SAAO |   C |   120 | 17.0 |  Coadd 
     213 |         MASTER-SAAO |   C |    40 | 16.7 |        
     277 |         MASTER-SAAO |   C |    50 | 16.7 |        
     351 |         MASTER-SAAO |   C |    60 | 17.0 |        
     411 |         MASTER-SAAO |   C |   180 | 17.2 |  Coadd 
     430 |         MASTER-SAAO |   C |    60 | 16.9 |        
     510 |         MASTER-SAAO |   C |    60 | 16.8 |        
     589 |         MASTER-SAAO |   C |    60 | 16.7 |        
     649 |         MASTER-SAAO |   C |   180 | 17.0 |  Coadd 
     668 |         MASTER-SAAO |   C |    60 | 16.8 |        
     747 |         MASTER-SAAO |   C |    60 | 16.5 |        
     826 |         MASTER-SAAO |   C |    60 | 16.2 |        
     886 |         MASTER-SAAO |   C |   180 | 16.5 |  Coadd 
     907 |         MASTER-SAAO |   C |    60 | 16.3 |        
     986 |         MASTER-SAAO |   C |    60 | 15.5 |        
    1066 |         MASTER-SAAO |   C |    60 | 14.8 |        
    1157 |         MASTER-SAAO |   C |    60 | 14.8 |        
    2245 |         MASTER-OAFA |   C |   180 | 17.0 |        
    2441 |         MASTER-OAFA |   C |   180 | 17.1 |        
    2635 |         MASTER-OAFA |   C |   180 | 17.3 |        
    2839 |         MASTER-OAFA |   C |   180 | 17.3 |        
    3037 |         MASTER-OAFA |   C |   180 | 17.2 |        
    3231 |         MASTER-OAFA |   C |   180 | 17.1 |        
    3430 |         MASTER-OAFA |   C |   180 | 17.2 |        
    3623 |         MASTER-OAFA |   C |   180 | 17.2 |        
    3819 |         MASTER-OAFA |   C |   180 | 17.3 |        
    4012 |         MASTER-OAFA |   C |   180 | 17.4 |        
    4207 |         MASTER-OAFA |   C |   180 | 17.3 |        
    4403 |         MASTER-OAFA |   C |   180 | 17.4 |        
    4599 |         MASTER-OAFA |   C |   180 | 17.2 |        
    4795 |         MASTER-OAFA |   C |   180 | 17.3 |        
    4996 |         MASTER-OAFA |   C |   180 | 17.4 |        
    5191 |         MASTER-OAFA |   C |   180 | 17.4 |        
    5274 |         MASTER-SAAO |   C |   180 | 16.4 |        
    5391 |         MASTER-OAFA |   C |   180 | 17.4 |        
    5473 |         MASTER-SAAO |   C |   180 | 16.9 |        
    5584 |         MASTER-OAFA |   C |   180 | 17.5 |        
    5673 |         MASTER-SAAO |   C |   180 | 16.5 |        
    5872 |         MASTER-SAAO |   C |   180 | 16.5 |        
    6071 |         MASTER-SAAO |   C |   180 | 16.4 |        
    6271 |         MASTER-SAAO |   C |   180 | 16.0 |        
    6470 |         MASTER-SAAO |   C |   180 | 15.8 |        
    6671 |         MASTER-SAAO |   C |   180 | 15.9 |        
    6870 |         MASTER-SAAO |   C |   180 | 15.5 |        
   13214 |         MASTER-OAFA |   C |   180 | 17.7 |        
   13408 |         MASTER-OAFA |   C |   180 | 17.8 |        
   13602 |         MASTER-OAFA |   C |   180 | 17.7 |        
   13801 |         MASTER-OAFA |   C |   180 | 17.7 |        
   14000 |         MASTER-OAFA |   C |   180 | 17.6 |        
   14618 |         MASTER-OAFA |   C |    60 | 17.7 |        
   14789 |         MASTER-OAFA |   C |    60 | 17.7 |        
   15157 |         MASTER-OAFA |   C |    60 | 17.6 |        
   15328 |         MASTER-OAFA |   C |    60 | 17.6 |        
   15585 |         MASTER-OAFA |   C |    60 | 17.7 |        
   15768 |         MASTER-OAFA |   C |    60 | 17.7 |        
   56536 |        MASTER-Tunka |   C |   180 | 15.8 |        
   56716 |        MASTER-Tunka |   C |   540 | 17.2 |  Coadd 
   56536 |             MASTER- |   C |   180 | 14.9 |        
   56727 |        MASTER-Tunka |   C |   180 | 15.6 |        
   56727 |             MASTER- |   C |   180 | 15.7 |        
   56922 |        MASTER-Tunka |   C |   180 | 17.2 |        
   56922 |             MASTER- |   C |   180 | 17.2 |        
   57115 |        MASTER-Tunka |   C |   180 | 17.3 |        
   57115 |             MASTER- |   C |   180 | 17.3 |        
   57308 |        MASTER-Tunka |   C |   180 | 16.7 |        
   57308 |             MASTER- |   C |   180 | 16.1 |        
Filter C is a clear (unfiltred) band. 


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



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

  ID = 12578
TYPE = 35
DAYS = 0.5


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) was pointed to the SWIFT GRB 250520A ( R. A. J. Eyles-Ferris et al., GCN 40491) errorbox  23 sec after notice time and 46 sec after trigger time at 2025-05-20 02:43:03 UT, with upper limit up to  17.2 mag. The observations began at zenith distance = 25 deg. The sun  altitude  is -33.7 deg. 

MASTER-OAFA robotic telescope  located in Argentina (OAFA observatory of San Juan National University) was pointed to the SWIFT GRB 250520A errorbox  2131 sec after notice time and 2155 sec after trigger time at 2025-05-20 03:18:11 UT, with upper limit up to  17.8 mag. The observations began at zenith distance = 62 deg. The sun  altitude  is -70.2 deg. 

The galactic latitude b = -5 deg., longitude l = 22 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2875870

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

      52 |         MASTER-SAAO |   C |    10 | 16.3 |        
      67 |         MASTER-SAAO |   C |    40 | 16.8 |  Coadd 
     457 |         MASTER-SAAO |   C |   820 | 17.3 |  Coadd 
      80 |         MASTER-SAAO |   C |    10 | 16.3 |        
     115 |         MASTER-SAAO |   C |    20 | 16.4 |        
     159 |         MASTER-SAAO |   C |    30 | 16.7 |        
     204 |         MASTER-SAAO |   C |   120 | 17.0 |  Coadd 
     213 |         MASTER-SAAO |   C |    40 | 16.7 |        
     277 |         MASTER-SAAO |   C |    50 | 16.7 |        
     351 |         MASTER-SAAO |   C |    60 | 17.0 |        
     411 |         MASTER-SAAO |   C |   180 | 17.2 |  Coadd 
     430 |         MASTER-SAAO |   C |    60 | 16.9 |        
     510 |         MASTER-SAAO |   C |    60 | 16.8 |        
     589 |         MASTER-SAAO |   C |    60 | 16.7 |        
     649 |         MASTER-SAAO |   C |   180 | 17.0 |  Coadd 
     668 |         MASTER-SAAO |   C |    60 | 16.8 |        
     747 |         MASTER-SAAO |   C |    60 | 16.5 |        
     826 |         MASTER-SAAO |   C |    60 | 16.2 |        
     886 |         MASTER-SAAO |   C |   180 | 16.5 |  Coadd 
     907 |         MASTER-SAAO |   C |    60 | 16.3 |        
     986 |         MASTER-SAAO |   C |    60 | 15.5 |        
    1066 |         MASTER-SAAO |   C |    60 | 14.8 |        
    1157 |         MASTER-SAAO |   C |    60 | 14.8 |        
    2245 |         MASTER-OAFA |   C |   180 | 17.0 |        
    2441 |         MASTER-OAFA |   C |   180 | 17.1 |        
    2635 |         MASTER-OAFA |   C |   180 | 17.3 |        
    2839 |         MASTER-OAFA |   C |   180 | 17.3 |        
    3037 |         MASTER-OAFA |   C |   180 | 17.2 |        
    3231 |         MASTER-OAFA |   C |   180 | 17.1 |        
    3430 |         MASTER-OAFA |   C |   180 | 17.2 |        
    3623 |         MASTER-OAFA |   C |   180 | 17.2 |        
    3819 |         MASTER-OAFA |   C |   180 | 17.3 |        
    4012 |         MASTER-OAFA |   C |   180 | 17.4 |        
    4207 |         MASTER-OAFA |   C |   180 | 17.3 |        
    4403 |         MASTER-OAFA |   C |   180 | 17.4 |        
    4599 |         MASTER-OAFA |   C |   180 | 17.2 |        
    4795 |         MASTER-OAFA |   C |   180 | 17.3 |        
    4996 |         MASTER-OAFA |   C |   180 | 17.4 |        
    5191 |         MASTER-OAFA |   C |   180 | 17.4 |        
    5274 |         MASTER-SAAO |   C |   180 | 16.4 |        
    5391 |         MASTER-OAFA |   C |   180 | 17.4 |        
    5473 |         MASTER-SAAO |   C |   180 | 16.9 |        
    5584 |         MASTER-OAFA |   C |   180 | 17.5 |        
    5673 |         MASTER-SAAO |   C |   180 | 16.5 |        
    5872 |         MASTER-SAAO |   C |   180 | 16.5 |        
    6071 |         MASTER-SAAO |   C |   180 | 16.4 |        
    6271 |         MASTER-SAAO |   C |   180 | 16.0 |        
    6470 |         MASTER-SAAO |   C |   180 | 15.8 |        
    6671 |         MASTER-SAAO |   C |   180 | 15.9 |        
    6870 |         MASTER-SAAO |   C |   180 | 15.5 |        
   13214 |         MASTER-OAFA |   C |   180 | 17.7 |        
   13408 |         MASTER-OAFA |   C |   180 | 17.8 |        
   13602 |         MASTER-OAFA |   C |   180 | 17.7 |        
   13801 |         MASTER-OAFA |   C |   180 | 17.7 |        
   14000 |         MASTER-OAFA |   C |   180 | 17.6 |        
   14618 |         MASTER-OAFA |   C |    60 | 17.7 |        
   14789 |         MASTER-OAFA |   C |    60 | 17.7 |        
   15157 |         MASTER-OAFA |   C |    60 | 17.6 |        
   15328 |         MASTER-OAFA |   C |    60 | 17.6 |        
   15585 |         MASTER-OAFA |   C |    60 | 17.7 |        
   15768 |         MASTER-OAFA |   C |    60 | 17.7 |        
Filter C is a clear (unfiltred) band. 


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



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

  ID = 12577
TYPE = 35
DAYS = 0.1


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) was pointed to the SWIFT GRB 250520A ( R. A. J. Eyles-Ferris et al., GCN 40491) errorbox  23 sec after notice time and 46 sec after trigger time at 2025-05-20 02:43:03 UT, with upper limit up to  17.2 mag. The observations began at zenith distance = 25 deg. The sun  altitude  is -33.7 deg. 

MASTER-OAFA robotic telescope  located in Argentina (OAFA observatory of San Juan National University) was pointed to the SWIFT GRB 250520A errorbox  2131 sec after notice time and 2155 sec after trigger time at 2025-05-20 03:18:11 UT, with upper limit up to  17.5 mag. The observations began at zenith distance = 62 deg. The sun  altitude  is -70.2 deg. 

The galactic latitude b = -5 deg., longitude l = 22 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2875870

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

      52 |         MASTER-SAAO |   C |    10 | 16.3 |        
      67 |         MASTER-SAAO |   C |    40 | 16.8 |  Coadd 
     457 |         MASTER-SAAO |   C |   820 | 17.3 |  Coadd 
      80 |         MASTER-SAAO |   C |    10 | 16.3 |        
     115 |         MASTER-SAAO |   C |    20 | 16.4 |        
     159 |         MASTER-SAAO |   C |    30 | 16.7 |        
     204 |         MASTER-SAAO |   C |   120 | 17.0 |  Coadd 
     213 |         MASTER-SAAO |   C |    40 | 16.7 |        
     277 |         MASTER-SAAO |   C |    50 | 16.7 |        
     351 |         MASTER-SAAO |   C |    60 | 17.0 |        
     411 |         MASTER-SAAO |   C |   180 | 17.2 |  Coadd 
     430 |         MASTER-SAAO |   C |    60 | 16.9 |        
     510 |         MASTER-SAAO |   C |    60 | 16.8 |        
     589 |         MASTER-SAAO |   C |    60 | 16.7 |        
     649 |         MASTER-SAAO |   C |   180 | 17.0 |  Coadd 
     668 |         MASTER-SAAO |   C |    60 | 16.8 |        
     747 |         MASTER-SAAO |   C |    60 | 16.5 |        
     826 |         MASTER-SAAO |   C |    60 | 16.2 |        
     886 |         MASTER-SAAO |   C |   180 | 16.5 |  Coadd 
     907 |         MASTER-SAAO |   C |    60 | 16.3 |        
     986 |         MASTER-SAAO |   C |    60 | 15.5 |        
    1066 |         MASTER-SAAO |   C |    60 | 14.8 |        
    1157 |         MASTER-SAAO |   C |    60 | 14.8 |        
    2245 |         MASTER-OAFA |   C |   180 | 17.0 |        
    2441 |         MASTER-OAFA |   C |   180 | 17.1 |        
    2635 |         MASTER-OAFA |   C |   180 | 17.3 |        
    2839 |         MASTER-OAFA |   C |   180 | 17.3 |        
    3037 |         MASTER-OAFA |   C |   180 | 17.2 |        
    3231 |         MASTER-OAFA |   C |   180 | 17.1 |        
    3430 |         MASTER-OAFA |   C |   180 | 17.2 |        
    3623 |         MASTER-OAFA |   C |   180 | 17.2 |        
    3819 |         MASTER-OAFA |   C |   180 | 17.3 |        
    4012 |         MASTER-OAFA |   C |   180 | 17.4 |        
    4207 |         MASTER-OAFA |   C |   180 | 17.3 |        
    4403 |         MASTER-OAFA |   C |   180 | 17.4 |        
    4599 |         MASTER-OAFA |   C |   180 | 17.2 |        
    4795 |         MASTER-OAFA |   C |   180 | 17.3 |        
    4996 |         MASTER-OAFA |   C |   180 | 17.4 |        
    5191 |         MASTER-OAFA |   C |   180 | 17.4 |        
    5274 |         MASTER-SAAO |   C |   180 | 16.4 |        
    5391 |         MASTER-OAFA |   C |   180 | 17.4 |        
    5473 |         MASTER-SAAO |   C |   180 | 16.9 |        
    5584 |         MASTER-OAFA |   C |   180 | 17.5 |        
    5673 |         MASTER-SAAO |   C |   180 | 16.5 |        
    5872 |         MASTER-SAAO |   C |   180 | 16.5 |        
    6071 |         MASTER-SAAO |   C |   180 | 16.4 |        
    6271 |         MASTER-SAAO |   C |   180 | 16.0 |        
    6470 |         MASTER-SAAO |   C |   180 | 15.8 |        
    6671 |         MASTER-SAAO |   C |   180 | 15.9 |        
    6870 |         MASTER-SAAO |   C |   180 | 15.5 |        
Filter C is a clear (unfiltred) band. 


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



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

  ID = 12576
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) was pointed to the SWIFT GRB250520.11 (trigger No 1315630,18h 49m 04.32s , -11d 50m 49.2s, R=0.05) errorbox  23 sec after notice time and 46 sec after trigger time at 2025-05-20 02:43:03 UT, with upper limit up to  17.0 mag. The observations began at zenith distance = 25 deg. The sun  altitude  is -33.7 deg. 

The galactic latitude b = -5 deg., longitude l = 22 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2875870

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

      52 |         MASTER-SAAO |   C |    10 | 16.3 |        
      80 |         MASTER-SAAO |   C |    10 | 16.3 |        
     115 |         MASTER-SAAO |   C |    20 | 16.4 |        
     159 |         MASTER-SAAO |   C |    30 | 16.7 |        
     213 |         MASTER-SAAO |   C |    40 | 16.7 |        
     277 |         MASTER-SAAO |   C |    50 | 16.7 |        
     351 |         MASTER-SAAO |   C |    60 | 17.0 |        
     430 |         MASTER-SAAO |   C |    60 | 16.9 |        
Filter C is a clear (unfiltred) band. 


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



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

  ID = 12575
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) was pointed to the SWIFT GRB250520.11 (trigger No 1315630,18h 49m 04.32s , -11d 50m 49.2s, R=0.05) errorbox  23 sec after notice time and 46 sec after trigger time at 2025-05-20 02:43:03 UT, with upper limit up to  17.0 mag. The observations began at zenith distance = 25 deg. The sun  altitude  is -33.7 deg. 

The galactic latitude b = -5 deg., longitude l = 22 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2875870

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

      52 |         MASTER-SAAO |   C |    10 | 16.3 |        
      80 |         MASTER-SAAO |   C |    10 | 16.3 |        
     115 |         MASTER-SAAO |   C |    20 | 16.4 |        
     159 |         MASTER-SAAO |   C |    30 | 16.7 |        
     213 |         MASTER-SAAO |   C |    40 | 16.7 |        
     277 |         MASTER-SAAO |   C |    50 | 16.7 |        
     351 |         MASTER-SAAO |   C |    60 | 17.0 |        
     430 |         MASTER-SAAO |   C |    60 | 16.9 |        
Filter C is a clear (unfiltred) band. 


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



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

  ID = 12574
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) was pointed to the SWIFT GRB250520.11 (trigger No 1315630,18h 49m 04.32s , -11d 50m 49.2s, R=0.05) errorbox  23 sec after notice time and 46 sec after trigger time at 2025-05-20 02:43:03 UT, with upper limit up to  17.0 mag. The observations began at zenith distance = 25 deg. The sun  altitude  is -33.7 deg. 

The galactic latitude b = -5 deg., longitude l = 22 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2875870

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

      52 |         MASTER-SAAO |   C |    10 | 16.3 |        
      80 |         MASTER-SAAO |   C |    10 | 16.3 |        
     115 |         MASTER-SAAO |   C |    20 | 16.4 |        
     159 |         MASTER-SAAO |   C |    30 | 16.7 |        
     213 |         MASTER-SAAO |   C |    40 | 16.7 |        
     277 |         MASTER-SAAO |   C |    50 | 16.7 |        
     351 |         MASTER-SAAO |   C |    60 | 17.0 |        
     430 |         MASTER-SAAO |   C |    60 | 16.9 |        
Filter C is a clear (unfiltred) band. 


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

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