MASTER Net MASTER Database: GRB210818.04 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 GRB210818.04
Trignum 1069169
Trigger time 2021-08-18 01:02:07.95
Notice time 2021-08-18 01:04:28.304031
Coord, eb (09h 56m 31.51s , -87d 01m 53.4s) , 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)

You are viewing outdated information, relevant error box is here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
2220757 2023-06-03 12:02:22.185403 09h 56m 31.51s -87d 01m 53.4s SWIFT 0.05 retraction 1069169 1 4044 retraction
1693407 2021-08-18 01:12:56.07211 09h 55m 28.08s -87d 01m 30.0s SWIFT 0.000111111 alert 1069169 2 81 alert
1693397 2021-08-18 01:05:32.432253 09h 55m 23.76s -87d 01m 30.0s SWIFT 0 alert 1069169 1 78 alert
1693394 2021-08-18 01:05:17.821045 09h 55m 23.76s -87d 01m 30.0s SWIFT 0.00130556 alert 1069169 4 69 alert
1693399 2021-08-18 01:06:58.708687 09h 56m 17.78s -87d 01m 35.0s SWIFT 0 alert 1069169 10 68 alert
1693389 2021-08-18 01:05:07.959115 09h 55m 23.76s -87d 01m 30.0s SWIFT 0.00130556 alert 1069169 4 67 alert
1693372 2021-08-18 01:04:28.304031 09h 56m 31.51s -87d 01m 53.4s SWIFT 0.05 alert 1069169 6 61 alert

DAYS:

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

Synchronous WFC images
Distance datetime coord2000 observatory camera links
96.9 2021-08-18 01:02:05.439 17h 15m 32.00s +05d 53m 53.0s OAFA 29008 Database OAFA
Errorbox center visibility at MASTER facilities
trigger notice notice+1hr now

2021-08-18 01:02:07 (JD 2459444.543137)

Siderial time 1.318141 h

Ra 09:56:31.51 Dec -87:01:53.40
(149.131292d, -87.031500d)

Rise n/a

Transit n/a

Set n/a

Amur

Object: Altitude: -47.99 Azimuth: 357.18

Sun: Altitude: 41.88 Azimuth: 306.94

Moon: Altitude: -59.07 Azimuth: 223.96

Tunka

Object: Altitude: -50.43 Azimuth: 355.81

Sun: Altitude: 27.45 Azimuth: 284.17

Moon: Altitude: -63.26 Azimuth: 177.55

Kislovodsk

Object: Altitude: -45.37 Azimuth: 356.51

Sun: Altitude: -12.80 Azimuth: 237.23

Moon: Altitude: -37.07 Azimuth: 89.28

Tavrida

Object: Altitude: -46.71 Azimuth: 356.83

Sun: Altitude: -17.13 Azimuth: 230.11

Moon: Altitude: -31.04 Azimuth: 84.24

SAAO

Object: Altitude: 29.90 Azimuth: 358.09

Sun: Altitude: -52.21 Azimuth: 292.16

Moon: Altitude: 8.06 Azimuth: 65.33

IAC

Object: Altitude: -31.26 Azimuth: 0.21

Sun: Altitude: -48.49 Azimuth: 177.55

Moon: Altitude: 11.96 Azimuth: 52.68

Argentina

Object: Altitude: 30.12 Azimuth: 2.86

Sun: Altitude: -36.93 Azimuth: 82.50

Moon: Altitude: 81.25 Azimuth: 138.52

Mexico

Object: Altitude: -30.63 Azimuth: 3.42

Sun: Altitude: 11.43 Azimuth: 98.62

Moon: Altitude: 24.80 Azimuth: 325.42

Ural

Object: Altitude: -57.82 Azimuth: 354.68

Sun: Altitude: 2.79 Azimuth: 249.86

Moon: Altitude: -44.89 Azimuth: 115.86

Vostryakovo

Object: Altitude: -57.19 Azimuth: 355.75

Sun: Altitude: -8.50 Azimuth: 231.50

Moon: Altitude: -33.66 Azimuth: 93.90

Gal. latitude: -25.215350 Gal. longitude: 300.757724

Dist. to Sun: 100.214849

Dist. to Moon: 66.302351

Moon coord.: (266.438464 d, -25.087113 d)

Sun coord.: (147.310356 d, 13.181867 d)

Lunar disk: 0.763815

Lunar phase: 58.154581

Lunar bright limb: 270.398206

No SN in this field

2021-08-18 01:04:28 (JD 2459444.544769)

Siderial time 1.357415 h

Ra 09:56:31.51 Dec -87:01:53.40
(149.131292d, -87.031500d)

Rise n/a

Transit n/a

Set n/a

Amur

Object: Altitude: -47.97 Azimuth: 357.22

Sun: Altitude: 42.18 Azimuth: 307.60

Moon: Altitude: -58.82 Azimuth: 224.83

Tunka

Object: Altitude: -50.40 Azimuth: 355.84

Sun: Altitude: 27.80 Azimuth: 284.68

Moon: Altitude: -63.28 Azimuth: 178.68

Kislovodsk

Object: Altitude: -45.35 Azimuth: 356.49

Sun: Altitude: -12.45 Azimuth: 237.69

Moon: Altitude: -37.48 Azimuth: 89.67

Tavrida

Object: Altitude: -46.69 Azimuth: 356.80

Sun: Altitude: -16.81 Azimuth: 230.61

Moon: Altitude: -31.44 Azimuth: 84.61

SAAO

Object: Altitude: 29.92 Azimuth: 358.06

Sun: Altitude: -51.75 Azimuth: 291.61

Moon: Altitude: 7.62 Azimuth: 65.06

IAC

Object: Altitude: -31.26 Azimuth: 0.18

Sun: Altitude: -48.51 Azimuth: 178.41

Moon: Altitude: 11.56 Azimuth: 53.01

Argentina

Object: Altitude: 30.10 Azimuth: 2.83

Sun: Altitude: -37.43 Azimuth: 82.14

Moon: Altitude: 80.93 Azimuth: 135.97

Mexico

Object: Altitude: -30.66 Azimuth: 3.43

Sun: Altitude: 10.93 Azimuth: 98.91

Moon: Altitude: 25.07 Azimuth: 325.90

Ural

Object: Altitude: -57.79 Azimuth: 354.67

Sun: Altitude: 3.09 Azimuth: 250.34

Moon: Altitude: -45.17 Azimuth: 116.47

Vostryakovo

Object: Altitude: -57.16 Azimuth: 355.72

Sun: Altitude: -8.24 Azimuth: 232.02

Moon: Altitude: -33.98 Azimuth: 94.38

Gal. latitude: -25.215350 Gal. longitude: 300.757724

Dist. to Sun: 100.214322

Dist. to Moon: 66.301018

Moon coord.: (266.463986 d, -25.089611 d)

Sun coord.: (147.311874 d, 13.181342 d)

Lunar disk: 0.763974

Lunar phase: 58.133049

Lunar bright limb: 270.386001

No SN in this field

2021-08-18 02:04:28 (JD 2459444.586435)

Siderial time 2.360153 h

Ra 09:56:31.51 Dec -87:01:53.40
(149.131292d, -87.031500d)

Rise n/a

Transit n/a

Set n/a

Amur

Object: Altitude: -47.59 Azimuth: 358.22

Sun: Altitude: 48.72 Azimuth: 326.30

Moon: Altitude: -51.41 Azimuth: 243.69

Tunka

Object: Altitude: -49.78 Azimuth: 356.57

Sun: Altitude: 36.40 Azimuth: 298.65

Moon: Altitude: -61.37 Azimuth: 206.65

Kislovodsk

Object: Altitude: -44.64 Azimuth: 356.05

Sun: Altitude: -2.79 Azimuth: 248.76

Moon: Altitude: -47.86 Azimuth: 100.42

Tavrida

Object: Altitude: -46.03 Azimuth: 356.20

Sun: Altitude: -7.93 Azimuth: 242.50

Moon: Altitude: -41.69 Azimuth: 94.65

SAAO

Object: Altitude: 30.42 Azimuth: 357.38

Sun: Altitude: -39.55 Azimuth: 280.01

Moon: Altitude: -3.00 Azimuth: 57.51

IAC

Object: Altitude: -31.20 Azimuth: 359.27

Sun: Altitude: -46.40 Azimuth: 199.86

Moon: Altitude: 0.92 Azimuth: 60.57

Argentina

Object: Altitude: 29.53 Azimuth: 2.22

Sun: Altitude: -49.83 Azimuth: 71.40

Moon: Altitude: 70.14 Azimuth: 104.16

Mexico

Object: Altitude: -31.43 Azimuth: 3.44

Sun: Altitude: -1.61 Azimuth: 106.43

Moon: Altitude: 30.72 Azimuth: 339.19

Ural

Object: Altitude: -57.01 Azimuth: 354.54

Sun: Altitude: 11.01 Azimuth: 262.72

Moon: Altitude: -51.63 Azimuth: 133.57

Vostryakovo

Object: Altitude: -56.47 Azimuth: 355.07

Sun: Altitude: -1.01 Azimuth: 244.75

Moon: Altitude: -42.05 Azimuth: 107.40

Gal. latitude: -25.215350 Gal. longitude: 300.757724

Dist. to Sun: 100.200846

Dist. to Moon: 66.268384

Moon coord.: (267.115944 d, -25.151897 d)

Sun coord.: (147.350635 d, 13.167928 d)

Lunar disk: 0.768036

Lunar phase: 57.583335

Lunar bright limb: 270.073423

No SN in this field

2025-05-09 20:06:31 (JD 2460805.337859)

Siderial time 13.809057 h

Ra 09:56:31.51 Dec -87:01:53.40
(149.131292d, -87.031500d)

Rise n/a

Transit n/a

Set n/a

Amur

Object: Altitude: -52.80 Azimuth: 2.61

Sun: Altitude: 1.54 Azimuth: 243.97

Moon: Altitude: -13.92 Azimuth: 92.99

Tunka

Object: Altitude: -53.37 Azimuth: 4.15

Sun: Altitude: -10.00 Azimuth: 224.11

Moon: Altitude: 1.10 Azimuth: 74.24

Kislovodsk

Object: Altitude: -42.34 Azimuth: 3.58

Sun: Altitude: -27.31 Azimuth: 164.31

Moon: Altitude: 35.42 Azimuth: 19.87

Tavrida

Object: Altitude: -42.95 Azimuth: 3.30

Sun: Altitude: -24.30 Azimuth: 155.76

Moon: Altitude: 36.02 Azimuth: 9.51

SAAO

Object: Altitude: 34.59 Azimuth: 2.37

Sun: Altitude: -54.11 Azimuth: 74.40

Moon: Altitude: 65.88 Azimuth: 193.24

IAC

Object: Altitude: -25.34 Azimuth: 0.22

Sun: Altitude: -5.40 Azimuth: 113.20

Moon: Altitude: 34.50 Azimuth: 305.50

Argentina

Object: Altitude: 33.72 Azimuth: 357.31

Sun: Altitude: 18.85 Azimuth: 125.84

Moon: Altitude: -0.06 Azimuth: 280.40

Mexico

Object: Altitude: -31.01 Azimuth: 356.54

Sun: Altitude: 72.33 Azimuth: 42.83

Moon: Altitude: -43.97 Azimuth: 250.55

Ural

Object: Altitude: -56.40 Azimuth: 5.29

Sun: Altitude: -15.43 Azimuth: 182.40

Moon: Altitude: 18.73 Azimuth: 34.95

Vostryakovo

Object: Altitude: -53.74 Azimuth: 4.27

Sun: Altitude: -15.30 Azimuth: 160.92

Moon: Altitude: 25.10 Azimuth: 12.64

Gal. latitude: -25.215350 Gal. longitude: 300.757724

Dist. to Sun: 108.119934

Dist. to Moon: 79.174989

Moon coord.: (195.764559 d, -8.793452 d)

Sun coord.: (46.635786 d, 17.501124 d)

Lunar disk: 0.927875

Lunar phase: 31.157250

Lunar bright limb: 289.382024

No SN in this field
Recent coverage and limits telegrams

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

  ID = 4824
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 GRB 210818A ( A. P. Beardmore et al., GCN 30652) errorbox  22995 sec after notice time and 23077 sec after trigger time at 2021-08-18 07:27:44 UT, with upper limit up to  18.9 mag. The observations began at zenith distance = 62 deg. The sun  altitude  is -47.3 deg. 

The galactic latitude b = -25 deg., longitude l = 301 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1693376

We obtain a following upper limits.  

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

   23167 |         MASTER-OAFA |   C |   180 | 13.8 |        
   23347 |         MASTER-OAFA |   C |   540 | 14.9 |  Coadd 
   23379 |         MASTER-OAFA |   C |   180 | 14.9 |        
   23559 |         MASTER-OAFA |   C |   540 | 15.3 |  Coadd 
   23592 |         MASTER-OAFA |   C |   180 | 14.6 |        
   23812 |         MASTER-OAFA |   C |   180 | 14.3 |        
   24026 |         MASTER-OAFA |   C |   180 | 14.8 |        
   24242 |         MASTER-OAFA |   C |   180 | 15.8 |        
   24456 |         MASTER-OAFA |   C |   180 | 15.0 |        
   24636 |         MASTER-OAFA |   C |   540 | 17.0 |  Coadd 
   24668 |         MASTER-OAFA |   C |   180 | 14.9 |        
   24883 |         MASTER-OAFA |   C |   180 | 16.4 |        
   25099 |         MASTER-OAFA |   C |   180 | 17.3 |        
   25279 |         MASTER-OAFA |   C |   540 | 18.0 |  Coadd 
   25329 |         MASTER-OAFA |   C |   180 | 17.4 |        
   25546 |         MASTER-OAFA |   C |   180 | 17.4 |        
   25762 |         MASTER-OAFA |   C |   180 | 16.9 |        
   25942 |         MASTER-OAFA |   C |   540 | 18.0 |  Coadd 
   25975 |         MASTER-OAFA |   C |   180 | 18.0 |        
   26190 |         MASTER-OAFA |   C |   180 | 17.3 |        
   26405 |         MASTER-OAFA |   C |   180 | 17.3 |        
   26585 |         MASTER-OAFA |   C |   540 | 17.6 |  Coadd 
   26621 |         MASTER-OAFA |   C |   180 | 17.7 |        
   26833 |         MASTER-OAFA |   C |   180 | 17.5 |        
   27049 |         MASTER-OAFA |   C |   180 | 17.7 |        
   27229 |         MASTER-OAFA |   C |   540 | 18.3 |  Coadd 
   27264 |         MASTER-OAFA |   C |   180 | 17.5 |        
   27479 |         MASTER-OAFA |   C |   180 | 17.7 |        
   27691 |         MASTER-OAFA |   C |   180 | 17.5 |        
   27871 |         MASTER-OAFA |   C |   540 | 18.5 |  Coadd 
   27906 |         MASTER-OAFA |   C |   180 | 17.6 |        
   28123 |         MASTER-OAFA |   C |   180 | 18.2 |        
   28337 |         MASTER-OAFA |   C |   180 | 17.7 |        
   28517 |         MASTER-OAFA |   C |   540 | 18.1 |  Coadd 
   28551 |         MASTER-OAFA |   C |   180 | 17.3 |        
   28765 |         MASTER-OAFA |   C |   180 | 18.0 |        
   28983 |         MASTER-OAFA |   C |   180 | 18.0 |        
   29199 |         MASTER-OAFA |   C |   180 | 17.9 |        
   29415 |         MASTER-OAFA |   C |   180 | 17.7 |        
   29595 |         MASTER-OAFA |   C |   540 | 18.0 |  Coadd 
   29630 |         MASTER-OAFA |   C |   180 | 17.5 |        
   29810 |         MASTER-OAFA |   C |   540 | 18.6 |  Coadd 
   29842 |         MASTER-OAFA |   C |   180 | 18.2 |        
   30058 |         MASTER-OAFA |   C |   180 | 18.4 |        
   30272 |         MASTER-OAFA |   C |   180 | 18.2 |        
   30488 |         MASTER-OAFA |   C |   180 | 17.8 |        
   30701 |         MASTER-OAFA |   C |   180 | 18.0 |        
   30881 |         MASTER-OAFA |   C |   540 | 18.9 |  Coadd 
   30917 |         MASTER-OAFA |   C |   180 | 18.1 |        
   31130 |         MASTER-OAFA |   C |   180 | 18.3 |        
   31329 |         MASTER-OAFA |   C |   180 | 18.3 |        
   31729 |         MASTER-OAFA |   C |   180 | 18.4 |        
   31909 |         MASTER-OAFA |   C |   540 | 18.5 |  Coadd 
   31928 |         MASTER-OAFA |   C |   180 | 18.4 |        
   32127 |         MASTER-OAFA |   C |   180 | 18.0 |        
   32327 |         MASTER-OAFA |   C |   180 | 17.4 |        
   32507 |         MASTER-OAFA |   C |   540 | 18.0 |  Coadd 
   32527 |         MASTER-OAFA |   C |   180 | 17.3 |        
   32726 |         MASTER-OAFA |   C |   180 | 17.1 |        
   32926 |         MASTER-OAFA |   C |   180 | 17.3 |        
   33106 |         MASTER-OAFA |   C |   540 | 17.9 |  Coadd 
   33125 |         MASTER-OAFA |   C |   180 | 17.5 |        
   33325 |         MASTER-OAFA |   C |   180 | 17.1 |        
   33524 |         MASTER-OAFA |   C |   180 | 16.7 |        
Filter C is a clear (unfiltred) band. 


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



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

  ID = 4823
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 GRB 210818A ( A. P. Beardmore et al., GCN 30652) errorbox  22995 sec after notice time and 23077 sec after trigger time at 2021-08-18 07:27:44 UT, with upper limit up to  18.9 mag. The observations began at zenith distance = 62 deg. The sun  altitude  is -47.3 deg. 

The galactic latitude b = -25 deg., longitude l = 301 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1693376

We obtain a following upper limits.  

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

   23167 |         MASTER-OAFA |   C |   180 | 13.8 |        
   23347 |         MASTER-OAFA |   C |   540 | 14.9 |  Coadd 
   23379 |         MASTER-OAFA |   C |   180 | 14.9 |        
   23559 |         MASTER-OAFA |   C |   540 | 15.3 |  Coadd 
   23592 |         MASTER-OAFA |   C |   180 | 14.6 |        
   23812 |         MASTER-OAFA |   C |   180 | 14.3 |        
   24026 |         MASTER-OAFA |   C |   180 | 14.8 |        
   24242 |         MASTER-OAFA |   C |   180 | 15.8 |        
   24456 |         MASTER-OAFA |   C |   180 | 15.0 |        
   24636 |         MASTER-OAFA |   C |   540 | 17.0 |  Coadd 
   24668 |         MASTER-OAFA |   C |   180 | 14.9 |        
   24883 |         MASTER-OAFA |   C |   180 | 16.4 |        
   25099 |         MASTER-OAFA |   C |   180 | 17.3 |        
   25279 |         MASTER-OAFA |   C |   540 | 18.0 |  Coadd 
   25329 |         MASTER-OAFA |   C |   180 | 17.4 |        
   25546 |         MASTER-OAFA |   C |   180 | 17.4 |        
   25762 |         MASTER-OAFA |   C |   180 | 16.9 |        
   25942 |         MASTER-OAFA |   C |   540 | 18.0 |  Coadd 
   25975 |         MASTER-OAFA |   C |   180 | 18.0 |        
   26190 |         MASTER-OAFA |   C |   180 | 17.3 |        
   26405 |         MASTER-OAFA |   C |   180 | 17.3 |        
   26585 |         MASTER-OAFA |   C |   540 | 17.6 |  Coadd 
   26621 |         MASTER-OAFA |   C |   180 | 17.7 |        
   26833 |         MASTER-OAFA |   C |   180 | 17.5 |        
   27049 |         MASTER-OAFA |   C |   180 | 17.7 |        
   27229 |         MASTER-OAFA |   C |   540 | 18.3 |  Coadd 
   27264 |         MASTER-OAFA |   C |   180 | 17.5 |        
   27479 |         MASTER-OAFA |   C |   180 | 17.7 |        
   27691 |         MASTER-OAFA |   C |   180 | 17.5 |        
   27871 |         MASTER-OAFA |   C |   540 | 18.5 |  Coadd 
   27906 |         MASTER-OAFA |   C |   180 | 17.6 |        
   28123 |         MASTER-OAFA |   C |   180 | 18.2 |        
   28337 |         MASTER-OAFA |   C |   180 | 17.7 |        
   28517 |         MASTER-OAFA |   C |   540 | 18.1 |  Coadd 
   28551 |         MASTER-OAFA |   C |   180 | 17.3 |        
   28765 |         MASTER-OAFA |   C |   180 | 18.0 |        
   28983 |         MASTER-OAFA |   C |   180 | 18.0 |        
   29199 |         MASTER-OAFA |   C |   180 | 17.9 |        
   29415 |         MASTER-OAFA |   C |   180 | 17.7 |        
   29595 |         MASTER-OAFA |   C |   540 | 18.0 |  Coadd 
   29630 |         MASTER-OAFA |   C |   180 | 17.5 |        
   29810 |         MASTER-OAFA |   C |   540 | 18.6 |  Coadd 
   29842 |         MASTER-OAFA |   C |   180 | 18.2 |        
   30058 |         MASTER-OAFA |   C |   180 | 18.4 |        
   30272 |         MASTER-OAFA |   C |   180 | 18.2 |        
   30488 |         MASTER-OAFA |   C |   180 | 17.8 |        
   30701 |         MASTER-OAFA |   C |   180 | 18.0 |        
   30881 |         MASTER-OAFA |   C |   540 | 18.9 |  Coadd 
   30917 |         MASTER-OAFA |   C |   180 | 18.1 |        
   31130 |         MASTER-OAFA |   C |   180 | 18.3 |        
   31329 |         MASTER-OAFA |   C |   180 | 18.3 |        
   31729 |         MASTER-OAFA |   C |   180 | 18.4 |        
   31909 |         MASTER-OAFA |   C |   540 | 18.5 |  Coadd 
   31928 |         MASTER-OAFA |   C |   180 | 18.4 |        
   32127 |         MASTER-OAFA |   C |   180 | 18.0 |        
   32327 |         MASTER-OAFA |   C |   180 | 17.4 |        
   32507 |         MASTER-OAFA |   C |   540 | 18.0 |  Coadd 
   32527 |         MASTER-OAFA |   C |   180 | 17.3 |        
   32726 |         MASTER-OAFA |   C |   180 | 17.1 |        
   32926 |         MASTER-OAFA |   C |   180 | 17.3 |        
   33106 |         MASTER-OAFA |   C |   540 | 17.9 |  Coadd 
   33125 |         MASTER-OAFA |   C |   180 | 17.5 |        
   33325 |         MASTER-OAFA |   C |   180 | 17.1 |        
   33524 |         MASTER-OAFA |   C |   180 | 16.7 |        
Filter C is a clear (unfiltred) band. 


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



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  ID = 4822
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 GRB 210818A ( A. P. Beardmore et al., GCN 30652) errorbox  22995 sec after notice time and 23077 sec after trigger time at 2021-08-18 07:27:44 UT, with upper limit up to  18.9 mag. The observations began at zenith distance = 62 deg. The sun  altitude  is -47.3 deg. 

The galactic latitude b = -25 deg., longitude l = 301 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1693376

We obtain a following upper limits.  

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

   23167 |         MASTER-OAFA |   C |   180 | 13.8 |        
   23347 |         MASTER-OAFA |   C |   540 | 14.9 |  Coadd 
   23379 |         MASTER-OAFA |   C |   180 | 14.9 |        
   23559 |         MASTER-OAFA |   C |   540 | 15.3 |  Coadd 
   23592 |         MASTER-OAFA |   C |   180 | 14.6 |        
   23812 |         MASTER-OAFA |   C |   180 | 14.3 |        
   24026 |         MASTER-OAFA |   C |   180 | 14.8 |        
   24242 |         MASTER-OAFA |   C |   180 | 15.8 |        
   24456 |         MASTER-OAFA |   C |   180 | 15.0 |        
   24636 |         MASTER-OAFA |   C |   540 | 17.0 |  Coadd 
   24668 |         MASTER-OAFA |   C |   180 | 14.9 |        
   24883 |         MASTER-OAFA |   C |   180 | 16.4 |        
   25099 |         MASTER-OAFA |   C |   180 | 17.3 |        
   25279 |         MASTER-OAFA |   C |   540 | 18.0 |  Coadd 
   25329 |         MASTER-OAFA |   C |   180 | 17.4 |        
   25546 |         MASTER-OAFA |   C |   180 | 17.4 |        
   25762 |         MASTER-OAFA |   C |   180 | 16.9 |        
   25942 |         MASTER-OAFA |   C |   540 | 18.0 |  Coadd 
   25975 |         MASTER-OAFA |   C |   180 | 18.0 |        
   26190 |         MASTER-OAFA |   C |   180 | 17.3 |        
   26405 |         MASTER-OAFA |   C |   180 | 17.3 |        
   26585 |         MASTER-OAFA |   C |   540 | 17.6 |  Coadd 
   26621 |         MASTER-OAFA |   C |   180 | 17.7 |        
   26833 |         MASTER-OAFA |   C |   180 | 17.5 |        
   27049 |         MASTER-OAFA |   C |   180 | 17.7 |        
   27229 |         MASTER-OAFA |   C |   540 | 18.3 |  Coadd 
   27264 |         MASTER-OAFA |   C |   180 | 17.5 |        
   27479 |         MASTER-OAFA |   C |   180 | 17.7 |        
   27691 |         MASTER-OAFA |   C |   180 | 17.5 |        
   27871 |         MASTER-OAFA |   C |   540 | 18.5 |  Coadd 
   27906 |         MASTER-OAFA |   C |   180 | 17.6 |        
   28123 |         MASTER-OAFA |   C |   180 | 18.2 |        
   28337 |         MASTER-OAFA |   C |   180 | 17.7 |        
   28517 |         MASTER-OAFA |   C |   540 | 18.1 |  Coadd 
   28551 |         MASTER-OAFA |   C |   180 | 17.3 |        
   28765 |         MASTER-OAFA |   C |   180 | 18.0 |        
   28983 |         MASTER-OAFA |   C |   180 | 18.0 |        
   29199 |         MASTER-OAFA |   C |   180 | 17.9 |        
   29415 |         MASTER-OAFA |   C |   180 | 17.7 |        
   29595 |         MASTER-OAFA |   C |   540 | 18.0 |  Coadd 
   29630 |         MASTER-OAFA |   C |   180 | 17.5 |        
   29810 |         MASTER-OAFA |   C |   540 | 18.6 |  Coadd 
   29842 |         MASTER-OAFA |   C |   180 | 18.2 |        
   30058 |         MASTER-OAFA |   C |   180 | 18.4 |        
   30272 |         MASTER-OAFA |   C |   180 | 18.2 |        
   30488 |         MASTER-OAFA |   C |   180 | 17.8 |        
   30701 |         MASTER-OAFA |   C |   180 | 18.0 |        
   30881 |         MASTER-OAFA |   C |   540 | 18.9 |  Coadd 
   30917 |         MASTER-OAFA |   C |   180 | 18.1 |        
   31130 |         MASTER-OAFA |   C |   180 | 18.3 |        
   31329 |         MASTER-OAFA |   C |   180 | 18.3 |        
   31729 |         MASTER-OAFA |   C |   180 | 18.4 |        
   31909 |         MASTER-OAFA |   C |   540 | 18.5 |  Coadd 
   31928 |         MASTER-OAFA |   C |   180 | 18.4 |        
   32127 |         MASTER-OAFA |   C |   180 | 18.0 |        
   32327 |         MASTER-OAFA |   C |   180 | 17.4 |        
   32507 |         MASTER-OAFA |   C |   540 | 18.0 |  Coadd 
   32527 |         MASTER-OAFA |   C |   180 | 17.3 |        
   32726 |         MASTER-OAFA |   C |   180 | 17.1 |        
   32926 |         MASTER-OAFA |   C |   180 | 17.3 |        
   33106 |         MASTER-OAFA |   C |   540 | 17.9 |  Coadd 
   33125 |         MASTER-OAFA |   C |   180 | 17.5 |        
   33325 |         MASTER-OAFA |   C |   180 | 17.1 |        
   33524 |         MASTER-OAFA |   C |   180 | 16.7 |        
Filter C is a clear (unfiltred) band. 


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

MASTER, 2002-2025