MASTER Net MASTER Database: GRB210403.35 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 GRB210403.35
Trignum 1040345
Trigger time 2021-04-03 08:27:13.95
Notice time 2021-04-03 08:27:36.099385
Coord, eb (00h 11m 04.08s , -32d 59m 56.4s) , 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)

All alerts for this trigger
id noticetime coord2000 satel errorbox type trigger seq trig_type links
1582523 2021-04-03 08:27:44.873961 00h 11m 04.08s -32d 59m 56.4s SWIFT 0.05 alert 1040345 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

2021-04-03 08:27:13 (JD 2459307.852234)

Siderial time 23.754539 h

Ra 00:11:04.08 Dec -32:59:56.40
( 2.767000d, -32.999000d)

Rise 2021-04-03 10:28:41

Transit 2021-04-03 11:52:56

Set 2021-04-03 13:17:12

Amur

Object: Altitude: -20.96 Azimuth: 63.15

Sun: Altitude: 14.44 Azimuth: 80.79

Moon: Altitude: -64.51 Azimuth: 172.33

Tunka

Object: Altitude: -9.26 Azimuth: 46.75

Sun: Altitude: 28.31 Azimuth: 59.07

Moon: Altitude: -55.75 Azimuth: 130.77

Kislovodsk

Object: Altitude: 13.24 Azimuth: 358.67

Sun: Altitude: 50.34 Azimuth: 342.35

Moon: Altitude: -17.95 Azimuth: 72.27

Tavrida

Object: Altitude: 11.74 Azimuth: 351.40

Sun: Altitude: 47.00 Azimuth: 330.50

Moon: Altitude: -12.57 Azimuth: 67.16

SAAO

Object: Altitude: 70.46 Azimuth: 278.13

Sun: Altitude: 41.00 Azimuth: 225.81

Moon: Altitude: 29.46 Azimuth: 77.52

IAC

Object: Altitude: 6.00 Azimuth: 312.73

Sun: Altitude: 19.90 Azimuth: 274.74

Moon: Altitude: 28.28 Azimuth: 33.44

Argentina

Object: Altitude: 0.23 Azimuth: 309.67

Sun: Altitude: -30.70 Azimuth: 283.95

Moon: Altitude: 70.80 Azimuth: 254.36

Mexico

Object: Altitude: -68.31 Azimuth: 281.91

Sun: Altitude: -50.58 Azimuth: 205.41

Moon: Altitude: 8.78 Azimuth: 306.29

Ural

Object: Altitude: -0.98 Azimuth: 12.93

Sun: Altitude: 38.09 Azimuth: 7.36

Moon: Altitude: -30.68 Azimuth: 90.70

Vostryakovo

Object: Altitude: 1.46 Azimuth: 354.75

Sun: Altitude: 38.35 Azimuth: 339.62

Moon: Altitude: -18.53 Azimuth: 72.63

Gal. latitude: -80.081542 Gal. longitude: 356.341040

Dist. to Sun: 39.415177

Dist. to Moon: 78.993441

Moon coord.: (269.818237 d, -24.983771 d)

Sun coord.: (12.432514 d, 5.334009 d)

Lunar disk: 0.619365

Lunar phase: 76.188389

Lunar bright limb: 90.445433

No SN in this field

2021-04-03 08:27:36 (JD 2459307.852500)

Siderial time 23.760945 h

Ra 00:11:04.08 Dec -32:59:56.40
( 2.767000d, -32.999000d)

Rise 2021-04-03 10:28:41

Transit 2021-04-03 11:52:56

Set 2021-04-03 13:17:12

Amur

Object: Altitude: -21.02 Azimuth: 63.21

Sun: Altitude: 14.38 Azimuth: 80.86

Moon: Altitude: -64.52 Azimuth: 172.52

Tunka

Object: Altitude: -9.31 Azimuth: 46.82

Sun: Altitude: 28.26 Azimuth: 59.17

Moon: Altitude: -55.79 Azimuth: 130.90

Kislovodsk

Object: Altitude: 13.24 Azimuth: 358.75

Sun: Altitude: 50.36 Azimuth: 342.49

Moon: Altitude: -18.01 Azimuth: 72.32

Tavrida

Object: Altitude: 11.75 Azimuth: 351.48

Sun: Altitude: 47.03 Azimuth: 330.63

Moon: Altitude: -12.63 Azimuth: 67.21

SAAO

Object: Altitude: 70.54 Azimuth: 278.11

Sun: Altitude: 41.06 Azimuth: 225.71

Moon: Altitude: 29.39 Azimuth: 77.48

IAC

Object: Altitude: 6.06 Azimuth: 312.78

Sun: Altitude: 19.99 Azimuth: 274.79

Moon: Altitude: 28.24 Azimuth: 33.52

Argentina

Object: Altitude: 0.29 Azimuth: 309.62

Sun: Altitude: -30.62 Azimuth: 283.88

Moon: Altitude: 70.88 Azimuth: 254.25

Mexico

Object: Altitude: -68.23 Azimuth: 281.91

Sun: Altitude: -50.54 Azimuth: 205.55

Moon: Altitude: 8.84 Azimuth: 306.34

Ural

Object: Altitude: -0.99 Azimuth: 13.01

Sun: Altitude: 38.09 Azimuth: 7.48

Moon: Altitude: -30.73 Azimuth: 90.78

Vostryakovo

Object: Altitude: 1.46 Azimuth: 354.83

Sun: Altitude: 38.37 Azimuth: 339.74

Moon: Altitude: -18.58 Azimuth: 72.70

Gal. latitude: -80.081542 Gal. longitude: 356.341040

Dist. to Sun: 39.415330

Dist. to Moon: 78.990099

Moon coord.: (269.822341 d, -24.984093 d)

Sun coord.: (12.432757 d, 5.334111 d)

Lunar disk: 0.619336

Lunar phase: 76.191846

Lunar bright limb: 90.443778

No SN in this field

2021-04-03 09:27:36 (JD 2459307.894167)

Siderial time 0.763683 h

Ra 00:11:04.08 Dec -32:59:56.40
( 2.767000d, -32.999000d)

Rise 2021-04-03 10:28:41

Transit 2021-04-03 11:52:56

Set 2021-04-03 13:17:12

Amur

Object: Altitude: -29.92 Azimuth: 73.11

Sun: Altitude: 4.85 Azimuth: 92.54

Moon: Altitude: -63.36 Azimuth: 202.37

Tunka

Object: Altitude: -16.64 Azimuth: 57.35

Sun: Altitude: 19.81 Azimuth: 72.68

Moon: Altitude: -61.30 Azimuth: 153.74

Kislovodsk

Object: Altitude: 12.26 Azimuth: 11.64

Sun: Altitude: 51.45 Azimuth: 6.22

Moon: Altitude: -28.16 Azimuth: 81.25

Tavrida

Object: Altitude: 12.13 Azimuth: 4.36

Sun: Altitude: 50.41 Azimuth: 352.78

Moon: Altitude: -22.37 Azimuth: 76.33

SAAO

Object: Altitude: 83.14 Azimuth: 277.36

Sun: Altitude: 48.64 Azimuth: 207.46

Moon: Altitude: 17.71 Azimuth: 71.13

IAC

Object: Altitude: 15.07 Azimuth: 321.77

Sun: Altitude: 33.04 Azimuth: 282.94

Moon: Altitude: 20.17 Azimuth: 44.78

Argentina

Object: Altitude: 10.64 Azimuth: 302.38

Sun: Altitude: -18.06 Azimuth: 274.98

Moon: Altitude: 81.45 Azimuth: 219.19

Mexico

Object: Altitude: -55.67 Azimuth: 284.22

Sun: Altitude: -43.09 Azimuth: 224.58

Moon: Altitude: 18.12 Azimuth: 315.78

Ural

Object: Altitude: -3.68 Azimuth: 25.34

Sun: Altitude: 35.75 Azimuth: 25.96

Moon: Altitude: -38.53 Azimuth: 103.52

Vostryakovo

Object: Altitude: 1.29 Azimuth: 7.44

Sun: Altitude: 39.96 Azimuth: 358.93

Moon: Altitude: -26.62 Azimuth: 83.85

Gal. latitude: -80.081542 Gal. longitude: 356.341040

Dist. to Sun: 39.439284

Dist. to Moon: 78.467396

Moon coord.: (270.464677 d, -25.032990 d)

Sun coord.: (12.470749 d, 5.350061 d)

Lunar disk: 0.614747

Lunar phase: 76.732697

Lunar bright limb: 90.184281

No SN in this field

2025-05-09 04:56:57 (JD 2460804.706215)

Siderial time 22.608107 h

Ra 00:11:04.08 Dec -32:59:56.40
( 2.767000d, -32.999000d)

Rise 2025-05-09 08:07:01

Transit 2025-05-09 09:31:16

Set 2025-05-09 10:55:31

Amur

Object: Altitude: -11.72 Azimuth: 51.61

Sun: Altitude: 52.23 Azimuth: 37.46

Moon: Altitude: -22.96 Azimuth: 249.32

Tunka

Object: Altitude: -2.38 Azimuth: 34.02

Sun: Altitude: 55.50 Azimuth: 357.55

Moon: Altitude: -35.03 Azimuth: 224.90

Kislovodsk

Object: Altitude: 11.37 Azimuth: 344.05

Sun: Altitude: 31.99 Azimuth: 276.41

Moon: Altitude: -45.69 Azimuth: 142.86

Tavrida

Object: Altitude: 8.42 Azimuth: 337.16

Sun: Altitude: 25.85 Azimuth: 270.80

Moon: Altitude: -40.89 Azimuth: 133.27

SAAO

Object: Altitude: 56.16 Azimuth: 282.25

Sun: Altitude: -4.08 Azimuth: 252.04

Moon: Altitude: -31.76 Azimuth: 58.57

IAC

Object: Altitude: -5.84 Azimuth: 304.52

Sun: Altitude: -16.98 Azimuth: 238.79

Moon: Altitude: -7.71 Azimuth: 88.10

Argentina

Object: Altitude: -10.18 Azimuth: 319.68

Sun: Altitude: -74.49 Azimuth: 337.48

Moon: Altitude: 41.82 Azimuth: 114.12

Mexico

Object: Altitude: -82.66 Azimuth: 287.56

Sun: Altitude: -31.13 Azimuth: 140.35

Moon: Altitude: 53.58 Azimuth: 3.41

Ural

Object: Altitude: -0.05 Azimuth: 358.56

Sun: Altitude: 38.13 Azimuth: 300.94

Moon: Altitude: -37.89 Azimuth: 169.84

Vostryakovo

Object: Altitude: -0.64 Azimuth: 340.50

Sun: Altitude: 27.36 Azimuth: 279.16

Moon: Altitude: -34.55 Azimuth: 143.11

Gal. latitude: -80.081542 Gal. longitude: 356.341040

Dist. to Sun: 65.112736

Dist. to Moon: 141.224036

Moon coord.: (189.083776 d, -5.310766 d)

Sun coord.: (46.020603 d, 17.333364 d)

Lunar disk: 0.894205

Lunar phase: 37.962915

Lunar bright limb: 291.509067

No SN in this field
Recent coverage and limits telegrams

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

  ID = 4051
TYPE = 35
DAYS = 1.1


MASTER-OAFA robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan National University) was pointed to the SWIFT GRB 210403A ( K. L. Page et al., GCN 29748) errorbox  1478 sec after notice time and 1500 sec after trigger time at 2021-04-03 08:52:14 UT, with upper limit up to  18.8 mag. The observations began at zenith distance = 85 deg. The sun  altitude  is -25.4 deg. 

The galactic latitude b = -80 deg., longitude l = 356 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1582518

We obtain a following upper limits.  

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

    1591 |         MASTER-OAFA |   C |   180 | 16.2 |        
    2025 |         MASTER-OAFA |   C |   180 | 17.0 |        
    2205 |         MASTER-OAFA |   C |   540 | 18.0 |  Coadd 
    3222 |         MASTER-OAFA |   C |   180 | 17.8 |        
    3422 |         MASTER-OAFA |   C |   180 | 17.9 |        
    3621 |         MASTER-OAFA |   C |   180 | 18.0 |        
    3801 |         MASTER-OAFA |   C |   540 | 18.8 |  Coadd 
    3820 |         MASTER-OAFA |   C |   180 | 18.0 |        
    4020 |         MASTER-OAFA |   C |   180 | 18.1 |        
    4219 |         MASTER-OAFA |   C |   180 | 18.1 |        
    4419 |         MASTER-OAFA |   C |   180 | 18.0 |        
   89882 |         MASTER-OAFA |   C |   180 | 15.5 |        
   91071 |         MASTER-OAFA |   C |   180 | 17.8 |        
Filter C is a clear (unfiltred) band. 


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



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

  ID = 4046
TYPE = 35
DAYS = 1


MASTER-OAFA robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan National University) was pointed to the SWIFT GRB 210403A ( K. L. Page et al., GCN 29748) errorbox  1478 sec after notice time and 1500 sec after trigger time at 2021-04-03 08:52:14 UT, with upper limit up to  18.8 mag. The observations began at zenith distance = 85 deg. The sun  altitude  is -25.4 deg. 

The galactic latitude b = -80 deg., longitude l = 356 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1582518

We obtain a following upper limits.  

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

    1591 |         MASTER-OAFA |   C |   180 | 16.2 |        
    2025 |         MASTER-OAFA |   C |   180 | 17.0 |        
    2205 |         MASTER-OAFA |   C |   540 | 18.0 |  Coadd 
    3222 |         MASTER-OAFA |   C |   180 | 17.8 |        
    3422 |         MASTER-OAFA |   C |   180 | 17.9 |        
    3621 |         MASTER-OAFA |   C |   180 | 18.0 |        
    3801 |         MASTER-OAFA |   C |   540 | 18.8 |  Coadd 
    3820 |         MASTER-OAFA |   C |   180 | 18.0 |        
    4020 |         MASTER-OAFA |   C |   180 | 18.1 |        
    4219 |         MASTER-OAFA |   C |   180 | 18.1 |        
    4419 |         MASTER-OAFA |   C |   180 | 18.0 |        
Filter C is a clear (unfiltred) band. 


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



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

  ID = 4040
TYPE = 35
DAYS = 0.5


MASTER-OAFA robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan National University) was pointed to the SWIFT GRB 210403A ( K. L. Page et al., GCN 29748) errorbox  1478 sec after notice time and 1500 sec after trigger time at 2021-04-03 08:52:14 UT, with upper limit up to  18.8 mag. The observations began at zenith distance = 85 deg. The sun  altitude  is -25.4 deg. 

The galactic latitude b = -80 deg., longitude l = 356 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1582518

We obtain a following upper limits.  

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

    1591 |         MASTER-OAFA |   C |   180 | 16.2 |        
    2025 |         MASTER-OAFA |   C |   180 | 17.0 |        
    2205 |         MASTER-OAFA |   C |   540 | 18.0 |  Coadd 
    3222 |         MASTER-OAFA |   C |   180 | 17.8 |        
    3422 |         MASTER-OAFA |   C |   180 | 17.9 |        
    3621 |         MASTER-OAFA |   C |   180 | 18.0 |        
    3801 |         MASTER-OAFA |   C |   540 | 18.8 |  Coadd 
    3820 |         MASTER-OAFA |   C |   180 | 18.0 |        
    4020 |         MASTER-OAFA |   C |   180 | 18.1 |        
    4219 |         MASTER-OAFA |   C |   180 | 18.1 |        
    4419 |         MASTER-OAFA |   C |   180 | 18.0 |        
Filter C is a clear (unfiltred) band. 


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



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

  ID = 4038
TYPE = 35
DAYS = 0.1


MASTER-OAFA robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan National University) was pointed to the SWIFT GRB 210403A ( K. L. Page et al., GCN 29748) errorbox  1478 sec after notice time and 1500 sec after trigger time at 2021-04-03 08:52:14 UT, with upper limit up to  18.8 mag. The observations began at zenith distance = 85 deg. The sun  altitude  is -25.4 deg. 

The galactic latitude b = -80 deg., longitude l = 356 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1582518

We obtain a following upper limits.  

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

    1591 |         MASTER-OAFA |   C |   180 | 16.2 |        
    2025 |         MASTER-OAFA |   C |   180 | 17.0 |        
    2205 |         MASTER-OAFA |   C |   540 | 18.0 |  Coadd 
    3222 |         MASTER-OAFA |   C |   180 | 17.8 |        
    3422 |         MASTER-OAFA |   C |   180 | 17.9 |        
    3621 |         MASTER-OAFA |   C |   180 | 18.0 |        
    3801 |         MASTER-OAFA |   C |   540 | 18.8 |  Coadd 
    3820 |         MASTER-OAFA |   C |   180 | 18.0 |        
    4020 |         MASTER-OAFA |   C |   180 | 18.1 |        
    4219 |         MASTER-OAFA |   C |   180 | 18.1 |        
    4419 |         MASTER-OAFA |   C |   180 | 18.0 |        
Filter C is a clear (unfiltred) band. 


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



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

  ID = 4037
TYPE = 35
DAYS = 0


MASTER-OAFA robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan National University) was pointed to the SWIFT GRB210403.35 (trigger No 1040345,00h 11m 04.08s , -32d 59m 56.4s, R=0.05) errorbox  1478 sec after notice time and 1500 sec after trigger time at 2021-04-03 08:52:14 UT, with upper limit up to  18.8 mag. The observations began at zenith distance = 85 deg. The sun  altitude  is -25.4 deg. 

The galactic latitude b = -80 deg., longitude l = 356 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1582518

We obtain a following upper limits.  

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

    1591 |         MASTER-OAFA |   C |   180 | 16.2 |        
    2025 |         MASTER-OAFA |   C |   180 | 17.0 |        
    2205 |         MASTER-OAFA |   C |   540 | 18.0 |  Coadd 
    3222 |         MASTER-OAFA |   C |   180 | 17.8 |        
    3422 |         MASTER-OAFA |   C |   180 | 17.9 |        
    3621 |         MASTER-OAFA |   C |   180 | 18.0 |        
    3801 |         MASTER-OAFA |   C |   540 | 18.8 |  Coadd 
    3820 |         MASTER-OAFA |   C |   180 | 18.0 |        
    4020 |         MASTER-OAFA |   C |   180 | 18.1 |        
    4219 |         MASTER-OAFA |   C |   180 | 18.1 |        
    4419 |         MASTER-OAFA |   C |   180 | 18.0 |        
Filter C is a clear (unfiltred) band. 


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



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

  ID = 4036
TYPE = 35
DAYS = 0


MASTER-OAFA robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan National University) was pointed to the SWIFT GRB210403.35 (trigger No 1040345,00h 11m 04.08s , -32d 59m 56.4s, R=0.05) errorbox  1478 sec after notice time and 1500 sec after trigger time at 2021-04-03 08:52:14 UT, with upper limit up to  18.8 mag. The observations began at zenith distance = 85 deg. The sun  altitude  is -25.4 deg. 

The galactic latitude b = -80 deg., longitude l = 356 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1582518

We obtain a following upper limits.  

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

    1591 |         MASTER-OAFA |   C |   180 | 16.2 |        
    2025 |         MASTER-OAFA |   C |   180 | 17.0 |        
    2205 |         MASTER-OAFA |   C |   540 | 18.0 |  Coadd 
    3222 |         MASTER-OAFA |   C |   180 | 17.8 |        
    3422 |         MASTER-OAFA |   C |   180 | 17.9 |        
    3621 |         MASTER-OAFA |   C |   180 | 18.0 |        
    3801 |         MASTER-OAFA |   C |   540 | 18.8 |  Coadd 
    3820 |         MASTER-OAFA |   C |   180 | 18.0 |        
    4020 |         MASTER-OAFA |   C |   180 | 18.1 |        
    4219 |         MASTER-OAFA |   C |   180 | 18.1 |        
    4419 |         MASTER-OAFA |   C |   180 | 18.0 |        
Filter C is a clear (unfiltred) band. 


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



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

  ID = 4035
TYPE = 34
DAYS = 0


MASTER-OAFA robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan National University) was pointed to the SWIFT GRB210403.35 (trigger No 1040345,00h 11m 04.08s , -32d 59m 56.4s, R=0.05) errorbox  1478 sec after notice time and 1500 sec after trigger time at 2021-04-03 08:52:14 UT, with upper limit up to  18.8 mag. The observations began at zenith distance = 85 deg. The sun  altitude  is -25.4 deg. 

The galactic latitude b = -80 deg., longitude l = 356 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1582518

We obtain a following upper limits.  

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

    1591 |         MASTER-OAFA |   C |   180 | 16.2 |        
    2025 |         MASTER-OAFA |   C |   180 | 17.0 |        
    2205 |         MASTER-OAFA |   C |   540 | 18.0 |  Coadd 
    3222 |         MASTER-OAFA |   C |   180 | 17.8 |        
    3422 |         MASTER-OAFA |   C |   180 | 17.9 |        
    3621 |         MASTER-OAFA |   C |   180 | 18.0 |        
    3801 |         MASTER-OAFA |   C |   540 | 18.8 |  Coadd 
    3820 |         MASTER-OAFA |   C |   180 | 18.0 |        
    4020 |         MASTER-OAFA |   C |   180 | 18.1 |        
    4219 |         MASTER-OAFA |   C |   180 | 18.1 |        
    4419 |         MASTER-OAFA |   C |   180 | 18.0 |        
Filter C is a clear (unfiltred) band. 


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

MASTER, 2002-2025