GRB210818.04 page :: MASTER Database

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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Name

SWIFT GRB210818.04

Trignum

1069169

Trigger time

2021-08-18 01:03:06.91

Notice time

2021-08-18 01:05:17.821045

Coord, eb

(09h 55m 23.76s , -87d 01m 30.0s) , 0.00130556

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You are viewing outdated information, relevant error box is here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

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 01:03:05.442	17^h 15^m 32.00^s +05^d 53^m 53.0^s	OAFA	29008	Database OAFA

Errorbox center visibility at MASTER facilities

trigger

notice

notice+1hr

now

2021-08-18 01:03:06 (JD 2459444.543819)

Siderial time 1.334575 h

Ra 09:55:23.76 Dec -87:01:30.00
(148.849000d, -87.025000d)

Rise n/a

Transit n/a

Set n/a

Amur

Object: Altitude: -47.97 Azimuth: 357.21

Sun: Altitude: 42.01 Azimuth: 307.22

Moon: Altitude: -58.97 Azimuth: 224.32

Tunka

Object: Altitude: -50.40 Azimuth: 355.83

Sun: Altitude: 27.60 Azimuth: 284.38

Moon: Altitude: -63.27 Azimuth: 178.02

Kislovodsk

Object: Altitude: -45.35 Azimuth: 356.49

Sun: Altitude: -12.65 Azimuth: 237.42

Moon: Altitude: -37.24 Azimuth: 89.44

Tavrida

Object: Altitude: -46.69 Azimuth: 356.80

Sun: Altitude: -17.00 Azimuth: 230.32

Moon: Altitude: -31.21 Azimuth: 84.39

SAAO

Object: Altitude: 29.91 Azimuth: 358.06

Sun: Altitude: -52.02 Azimuth: 291.92

Moon: Altitude: 7.88 Azimuth: 65.22

IAC

Object: Altitude: -31.27 Azimuth: 0.18

Sun: Altitude: -48.50 Azimuth: 177.91

Moon: Altitude: 11.79 Azimuth: 52.82

Argentina

Object: Altitude: 30.10 Azimuth: 2.84

Sun: Altitude: -37.14 Azimuth: 82.35

Moon: Altitude: 81.12 Azimuth: 137.43

Mexico

Object: Altitude: -30.65 Azimuth: 3.43

Sun: Altitude: 11.22 Azimuth: 98.74

Moon: Altitude: 24.91 Azimuth: 325.62

Ural

Object: Altitude: -57.79 Azimuth: 354.65

Sun: Altitude: 2.92 Azimuth: 250.06

Moon: Altitude: -45.01 Azimuth: 116.11

Vostryakovo

Object: Altitude: -57.17 Azimuth: 355.71

Sun: Altitude: -8.40 Azimuth: 231.72

Moon: Altitude: -33.80 Azimuth: 94.10

Gal. latitude: -25.220382 Gal. longitude: 300.740920

Dist. to Sun: 100.207707

Dist. to Moon: 66.317753

Moon coord.: (266.449143 d, -25.088159 d)

Sun coord.: (147.310991 d, 13.181647 d)

Lunar disk: 0.763881

Lunar phase: 58.145571

Lunar bright limb: 270.393099

No SN in this field

2021-08-18 01:05:17 (JD 2459444.545336)

Siderial time 1.371063 h

Ra 09:55:23.76 Dec -87:01:30.00
(148.849000d, -87.025000d)

Rise n/a

Transit n/a

Set n/a

Amur

Object: Altitude: -47.95 Azimuth: 357.24

Sun: Altitude: 42.28 Azimuth: 307.83

Moon: Altitude: -58.74 Azimuth: 225.12

Tunka

Object: Altitude: -50.38 Azimuth: 355.85

Sun: Altitude: 27.93 Azimuth: 284.86

Moon: Altitude: -63.28 Azimuth: 179.08

Kislovodsk

Object: Altitude: -45.33 Azimuth: 356.47

Sun: Altitude: -12.32 Azimuth: 237.85

Moon: Altitude: -37.62 Azimuth: 89.80

Tavrida

Object: Altitude: -46.67 Azimuth: 356.77

Sun: Altitude: -16.70 Azimuth: 230.78

Moon: Altitude: -31.58 Azimuth: 84.74

SAAO

Object: Altitude: 29.93 Azimuth: 358.04

Sun: Altitude: -51.59 Azimuth: 291.42

Moon: Altitude: 7.48 Azimuth: 64.96

IAC

Object: Altitude: -31.27 Azimuth: 0.15

Sun: Altitude: -48.51 Azimuth: 178.71

Moon: Altitude: 11.42 Azimuth: 53.12

Argentina

Object: Altitude: 30.07 Azimuth: 2.82

Sun: Altitude: -37.60 Azimuth: 82.02

Moon: Altitude: 80.81 Azimuth: 135.12

Mexico

Object: Altitude: -30.68 Azimuth: 3.44

Sun: Altitude: 10.76 Azimuth: 99.01

Moon: Altitude: 25.16 Azimuth: 326.07

Ural

Object: Altitude: -57.76 Azimuth: 354.64

Sun: Altitude: 3.20 Azimuth: 250.51

Moon: Altitude: -45.26 Azimuth: 116.68

Vostryakovo

Object: Altitude: -57.14 Azimuth: 355.68

Sun: Altitude: -8.15 Azimuth: 232.20

Moon: Altitude: -34.10 Azimuth: 94.54

Gal. latitude: -25.220382 Gal. longitude: 300.740920

Dist. to Sun: 100.207217

Dist. to Moon: 66.316515

Moon coord.: (266.472856 d, -25.090478 d)

Sun coord.: (147.312402 d, 13.181159 d)

Lunar disk: 0.764030

Lunar phase: 58.125567

Lunar bright limb: 270.381760

No SN in this field

2021-08-18 02:05:17 (JD 2459444.587002)

Siderial time 2.373801 h

Ra 09:55:23.76 Dec -87:01:30.00
(148.849000d, -87.025000d)

Rise n/a

Transit n/a

Set n/a

Amur

Object: Altitude: -47.57 Azimuth: 358.25

Sun: Altitude: 48.79 Azimuth: 326.58

Moon: Altitude: -51.30 Azimuth: 243.91

Tunka

Object: Altitude: -49.76 Azimuth: 356.59

Sun: Altitude: 36.51 Azimuth: 298.86

Moon: Altitude: -61.31 Azimuth: 207.00

Kislovodsk

Object: Altitude: -44.61 Azimuth: 356.03

Sun: Altitude: -2.65 Azimuth: 248.90

Moon: Altitude: -47.99 Azimuth: 100.58

Tavrida

Object: Altitude: -46.01 Azimuth: 356.18

Sun: Altitude: -7.81 Azimuth: 242.65

Moon: Altitude: -41.83 Azimuth: 94.80

SAAO

Object: Altitude: 30.44 Azimuth: 357.36

Sun: Altitude: -39.38 Azimuth: 279.88

Moon: Altitude: -3.14 Azimuth: 57.40

IAC

Object: Altitude: -31.20 Azimuth: 359.24

Sun: Altitude: -46.34 Azimuth: 200.13

Moon: Altitude: 0.77 Azimuth: 60.66

Argentina

Object: Altitude: 29.51 Azimuth: 2.21

Sun: Altitude: -49.99 Azimuth: 71.22

Moon: Altitude: 69.98 Azimuth: 103.94

Mexico

Object: Altitude: -31.46 Azimuth: 3.45

Sun: Altitude: -1.78 Azimuth: 106.54

Moon: Altitude: 30.77 Azimuth: 339.39

Ural

Object: Altitude: -56.99 Azimuth: 354.54

Sun: Altitude: 11.12 Azimuth: 262.89

Moon: Altitude: -51.71 Azimuth: 133.83

Vostryakovo

Object: Altitude: -56.45 Azimuth: 355.04

Sun: Altitude: -0.90 Azimuth: 244.92

Moon: Altitude: -42.15 Azimuth: 107.59

Gal. latitude: -25.220382 Gal. longitude: 300.740920

Dist. to Sun: 100.193751

Dist. to Moon: 66.283901

Moon coord.: (267.124822 d, -25.152725 d)

Sun coord.: (147.351163 d, 13.167746 d)

Lunar disk: 0.768091

Lunar phase: 57.575853

Lunar bright limb: 270.069156

No SN in this field

2025-05-09 20:21:51 (JD 2460805.348507)

Siderial time 14.065312 h

Ra 09:55:23.76 Dec -87:01:30.00
(148.849000d, -87.025000d)

Rise n/a

Transit n/a

Set n/a

Amur

Object: Altitude: -52.92 Azimuth: 2.32

Sun: Altitude: 3.76 Azimuth: 246.87

Moon: Altitude: -16.34 Azimuth: 95.87

Tunka

Object: Altitude: -53.56 Azimuth: 3.97

Sun: Altitude: -8.30 Azimuth: 227.39

Moon: Altitude: -1.18 Azimuth: 77.13

Kislovodsk

Object: Altitude: -42.52 Azimuth: 3.72

Sun: Altitude: -27.96 Azimuth: 168.37

Moon: Altitude: 34.36 Azimuth: 24.17

Tavrida

Object: Altitude: -43.12 Azimuth: 3.48

Sun: Altitude: -25.33 Azimuth: 159.62

Moon: Altitude: 35.42 Azimuth: 13.99

SAAO

Object: Altitude: 34.45 Azimuth: 2.56

Sun: Altitude: -57.20 Azimuth: 70.94

Moon: Altitude: 66.42 Azimuth: 184.22

IAC

Object: Altitude: -25.35 Azimuth: 0.46

Sun: Altitude: -8.48 Azimuth: 115.19

Moon: Altitude: 37.08 Azimuth: 308.75

Argentina

Object: Altitude: 33.89 Azimuth: 357.47

Sun: Altitude: 16.16 Azimuth: 123.24

Moon: Altitude: 3.10 Azimuth: 278.50

Mexico

Object: Altitude: -30.79 Azimuth: 356.55

Sun: Altitude: 69.92 Azimuth: 51.35

Moon: Altitude: -40.97 Azimuth: 253.45

Ural

Object: Altitude: -56.61 Azimuth: 5.38

Sun: Altitude: -15.28 Azimuth: 186.19

Moon: Altitude: 17.47 Azimuth: 38.59

Vostryakovo

Object: Altitude: -53.92 Azimuth: 4.48

Sun: Altitude: -15.94 Azimuth: 164.65

Moon: Altitude: 24.51 Azimuth: 16.64

Gal. latitude: -25.220382 Gal. longitude: 300.740920

Dist. to Sun: 108.109155

Dist. to Moon: 79.127923

Moon coord.: (195.877991 d, -8.851201 d)

Sun coord.: (46.646166 d, 17.503936 d)

Lunar disk: 0.928391

Lunar phase: 31.042888

Lunar bright limb: 289.337445

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.

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