Gamma-ray Burst 200829A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 29 Aug 20 14:00:51 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     993768,   Seg_Num: 0
GRB_RA:          251.212d {+16h 44m 51s} (J2000),
                 251.135d {+16h 44m 33s} (current),
                 251.402d {+16h 45m 36s} (1950)
GRB_DEC:         +72.335d {+72d 20' 07"} (J2000),
                 +72.298d {+72d 17' 53"} (current),
                 +72.424d {+72d 25' 28"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=2691 [image_cnts]
TRIGGER_DUR:     64.000 [sec] 
TRIGGER_INDEX:   20000     E_range: 15-50 keV
BKG_INTEN:       0 [cnts]
BKG_TIME:        0.00 SOD {00:00:00.00} UT
BKG_DUR:         0 [sec]
GRB_DATE:        19090 TJD;   242 DOY;   20/08/29
GRB_TIME:        50374.45 SOD {13:59:34.45} UT
GRB_PHI:         -33.40 [deg]
GRB_THETA:        22.68 [deg]
SOLN_STATUS:     0x20000013
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    11.74 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  +1  +0  +0 -13  +0 
SUN_POSTN:       158.43d {+10h 33m 43s}   +9.06d {+09d 03' 19"}
SUN_DIST:         82.20 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      296.69d {+19h 46m 45s}  -23.60d {-23d 35' 47"}
MOON_DIST:       100.73 [deg]
MOON_ILLUM:      87 [%]
GAL_COORDS:      104.51, 35.18 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      130.25, 81.30 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 74.12,10.54 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(81.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=8700).

red DSS finding chart ps-file

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sat 29 Aug 20 13:59:24 UT
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    8700,   Sub_Num: 0
GRB_INTEN:      9.43 [sigma]   
GRB_TIME:       50293.39 SOD {13:58:13.39} UT
GRB_DATE:       19090 TJD;   242 DOY;   20/08/29
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.
COMMENTS:       Time_Scale=2.0000 and Time_Error=1.0000.
COMMENTS:
COMMENTS:       NOTE: This SPIACS event is temporally(1.0<100sec) coincident with the FERMI_GBM event (trignum=620402299). 
COMMENTS:
COMMENTS:       The SPIACS lightcurve can be found at:
COMMENTS:       ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2020-08/2020-08-29T13-58-13.1935-19633-07056-0.lc

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 29 Aug 20 13:58:21 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     620402299
GRB_RA:          274.600d {+18h 18m 24s} (J2000),
                 274.297d {+18h 17m 11s} (current),
                 275.331d {+18h 21m 20s} (1950)
GRB_DEC:         +78.583d {+78d 34' 60"} (J2000),
                 +78.592d {+78d 35' 32"} (current),
                 +78.559d {+78d 33' 33"} (1950)
GRB_ERROR:       11.17 [deg radius, statistical plus systematic]
GRB_INTEN:       390 [cnts/sec]
DATA_SIGNIF:     7.00 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        19090 TJD;   242 DOY;   20/08/29
GRB_TIME:        50294.66 SOD {13:58:14.66} UT
GRB_PHI:         264.00 [deg]
GRB_THETA:       155.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      1.39
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      74%  Distant Particles
2nd_MOST_LIKELY:  25%  GRB
DETECTORS:       0,0,0, 0,1,0, 0,0,1, 0,0,0, 0,0,
SUN_POSTN:       158.43d {+10h 33m 42s}   +9.06d {+09d 03' 22"}
SUN_DIST:         86.04 [deg]   Sun_angle= -7.7 [hr] (East of Sun)
MOON_POSTN:      296.66d {+19h 46m 39s}  -23.60d {-23d 35' 55"}
MOON_DIST:       102.99 [deg]
MOON_ILLUM:      87 [%]
GAL_COORDS:      110.09, 28.18 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       85.65, 77.91 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200829582/quicklook/glg_lc_medres34_bn200829582.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 48.30,-25.45 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 29 Aug 20 13:58:44 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      71
TRIGGER_NUM:     620402299
GRB_RA:          271.617d {+18h 06m 28s} (J2000),
                 271.286d {+18h 05m 09s} (current),
                 272.416d {+18h 09m 40s} (1950)
GRB_DEC:         +79.067d {+79d 04' 00"} (J2000),
                 +79.070d {+79d 04' 11"} (current),
                 +79.057d {+79d 03' 25"} (1950)
GRB_ERROR:       3.27 [deg radius, statistical plus systematic]
GRB_INTEN:       18699 [cnts/sec]
DATA_SIGNIF:     463.90 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        19090 TJD;   242 DOY;   20/08/29
GRB_TIME:        50294.66 SOD {13:58:14.66} UT
GRB_PHI:         264.00 [deg]
GRB_THETA:       155.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.32
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      89%  Distant Particles
2nd_MOST_LIKELY:  10%  GRB
DETECTORS:       0,0,0, 0,1,0, 0,0,1, 0,0,0, 0,0,
SUN_POSTN:       158.43d {+10h 33m 42s}   +9.06d {+09d 03' 21"}
SUN_DIST:         85.31 [deg]   Sun_angle= -7.5 [hr] (East of Sun)
MOON_POSTN:      296.67d {+19h 46m 40s}  -23.60d {-23d 35' 53"}
MOON_DIST:       103.65 [deg]
MOON_ILLUM:      87 [%]
GAL_COORDS:      110.68, 28.73 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       88.58, 77.49 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200829582/quicklook/glg_lc_medres34_bn200829582.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 48.30,-25.45 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 29 Aug 20 13:58:37 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      68
TRIGGER_NUM:     620402299
GRB_RA:          244.700d {+16h 18m 48s} (J2000),
                 244.394d {+16h 17m 34s} (current),
                 245.459d {+16h 21m 50s} (1950)
GRB_DEC:         +79.717d {+79d 43' 00"} (J2000),
                 +79.667d {+79d 40' 02"} (current),
                 +79.834d {+79d 50' 03"} (1950)
GRB_ERROR:       4.30 [deg radius, statistical plus systematic]
GRB_INTEN:       3805 [cnts/sec]
DATA_SIGNIF:     46.70 [sigma]
INTEG_TIME:      0.512 [sec]
GRB_DATE:        19090 TJD;   242 DOY;   20/08/29
GRB_TIME:        50294.66 SOD {13:58:14.66} UT
GRB_PHI:         276.00 [deg]
GRB_THETA:       155.00 [deg]
DATA_TIME_SCALE: 0.5120 [sec]
HARD_RATIO:      0.29
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      80%  Distant Particles
2nd_MOST_LIKELY:  20%  GRB
DETECTORS:       0,0,0, 0,1,0, 0,0,1, 0,0,0, 0,0,
SUN_POSTN:       158.43d {+10h 33m 42s}   +9.06d {+09d 03' 21"}
SUN_DIST:         80.37 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:      296.66d {+19h 46m 40s}  -23.60d {-23d 35' 54"}
MOON_DIST:       107.05 [deg]
MOON_ILLUM:      87 [%]
GAL_COORDS:      113.28, 33.15 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      107.41, 75.23 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200829582/quicklook/glg_lc_medres34_bn200829582.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 48.30,-25.45 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 29 Aug 20 14:02:21 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     993768,   Seg_Num: 0
GRB_RA:          251.2096d {+16h 44m 50.3s} (J2000),
                 251.1330d {+16h 44m 31.9s} (current),
                 251.3990d {+16h 45m 35.7s} (1950)
GRB_DEC:         +72.3273d {+72d 19' 38.2"} (J2000),
                 +72.2902d {+72d 17' 24.6"} (current),
                 +72.4165d {+72d 24' 59.5"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       221 [cnts]
IMG_START_DATE:  19090 TJD;   242 DOY;   20/08/29
IMG_START_TIME:  50503.11 SOD {14:01:43.11} UT,   128.7 [sec] since BAT Trigger Time
CENTROID_X:      274.78,  raw= 275  [pixels]
CENTROID_Y:      309.32,  raw= 309  [pixels]
ROLL:            275.48 [deg]
GAIN:            4
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   26.46
GRB_POS_XRT_Z:   -76.88
IMAGE_URL:       sw00993768000msxps_rw.img
SUN_POSTN:       158.43d {+10h 33m 43s}   +9.05d {+09d 03' 18"}
SUN_DIST:         82.20 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      296.70d {+19h 46m 48s}  -23.60d {-23d 35' 42"}
MOON_DIST:       100.73 [deg]
MOON_ILLUM:      87 [%]
GAL_COORDS:      104.50, 35.19 [deg] galactic lon,lat of the burst
ECL_COORDS:      130.30, 81.30 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 29 Aug 20 14:02:23 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     993768,   Seg_Num: 0
GRB_RA:          251.2096d {+16h 44m 50.3s} (J2000),
                 251.1330d {+16h 44m 31.9s} (current),
                 251.3990d {+16h 45m 35.7s} (1950)
GRB_DEC:         +72.3273d {+72d 19' 38.2"} (J2000),
                 +72.2902d {+72d 17' 24.6"} (current),
                 +72.4165d {+72d 24' 59.5"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       221 [cnts]
IMG_START_DATE:  19090 TJD;   242 DOY;   20/08/29
IMG_START_TIME:  50503.11 SOD {14:01:43.11} UT,   128.7 [sec] since BAT Trigger Time
CENTROID_X:      274.78,  raw= 275  [pixels]
CENTROID_Y:      309.32,  raw= 309  [pixels]
ROLL:            275.48 [deg]
GAIN:            4
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   26.46
GRB_POS_XRT_Z:   -76.88
IMAGE_URL:       sw00993768000msxps_rw.img
SUN_POSTN:       158.43d {+10h 33m 43s}   +9.05d {+09d 03' 18"}
SUN_DIST:         82.20 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      296.70d {+19h 46m 48s}  -23.60d {-23d 35' 42"}
MOON_DIST:       100.73 [deg]
MOON_ILLUM:      87 [%]
GAL_COORDS:      104.50, 35.19 [deg] galactic lon,lat of the burst
ECL_COORDS:      130.30, 81.30 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 29 Aug 20 14:11:55 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     993768,   Seg_Num: 0
POINT_RA:        251.285d {+16h 45m 08s} (J2000)
POINT_DEC:       +72.331d {+72d 19' 53"} (J2000)
ROLL:            275.481d
IMG_START_DATE:  19090 TJD;   242 DOY;   20/08/29
IMG_START_TIME:  50670.91 SOD {14:04:30.91} UT,   296.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     620402696
X_OFFSET:        918 [pixels]
Y_OFFSET:        759 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1078
Y_GRB_POS:       919
BINNING_INDEX:   1
IM_URL:          sw00993768000msuni0322.fits
SUN_POSTN:       158.43d {+10h 33m 44s}   +9.05d {+09d 03' 09"}
SUN_DIST:         82.22 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      296.79d {+19h 47m 11s}  -23.59d {-23d 35' 11"}
MOON_DIST:       100.73 [deg]
MOON_ILLUM:      87 [%]
GAL_COORDS:      104.49, 35.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.19, 81.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 29 Aug 20 14:12:08 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     993768,   Seg_Num: 0
POINT_RA:        251.285d {+16h 45m 08s} (J2000)
POINT_DEC:       +72.331d {+72d 19' 53"} (J2000)
ROLL:            275.481d
IMG_START_DATE:  19090 TJD;   242 DOY;   20/08/29
IMG_START_TIME:  50670.91 SOD {14:04:30.91} UT,   296.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     620402696
X_OFFSET:        918 [pixels]
Y_OFFSET:        759 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1078
Y_GRB_POS:       919
BINNING_INDEX:   1
IM_URL:          sw00993768000msuni0322.fits
SUN_POSTN:       158.43d {+10h 33m 44s}   +9.05d {+09d 03' 09"}
SUN_DIST:         82.22 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      296.80d {+19h 47m 11s}  -23.59d {-23d 35' 10"}
MOON_DIST:       100.73 [deg]
MOON_ILLUM:      87 [%]
GAL_COORDS:      104.49, 35.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.19, 81.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 29 Aug 20 14:17:05 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     993768,   Seg_Num: 0
POINT_RA:        251.285d {+16h 45m 08s} (J2000)
POINT_DEC:       +72.331d {+72d 19' 52"} (J2000)
POINT_ROLL:      275.481d
IMG_START_DATE:  19090 TJD;   242 DOY;   20/08/29
IMG_START_TIME:  51251.08 SOD {14:14:11.08} UT,   876.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.230
N_STARS:         144
X_OFFSET:        358 [pixels]
Y_OFFSET:        199 [pixels]
X_MAX:           1797 [pixels]
Y_MAX:           1638 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00993768000msufc0876.fits
SUN_POSTN:       158.44d {+10h 33m 45s}   +9.05d {+09d 03' 05"}
SUN_DIST:         82.22 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      296.84d {+19h 47m 23s}  -23.58d {-23d 34' 54"}
MOON_DIST:       100.73 [deg]
MOON_ILLUM:      87 [%]
GAL_COORDS:      104.49, 35.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.19, 81.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 29 Aug 20 14:17:24 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     993768,   Seg_Num: 0
POINT_RA:        251.285d {+16h 45m 08s} (J2000)
POINT_DEC:       +72.331d {+72d 19' 52"} (J2000)
POINT_ROLL:      275.481d
IMG_START_DATE:  19090 TJD;   242 DOY;   20/08/29
IMG_START_TIME:  51251.08 SOD {14:14:11.08} UT,   876.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.230
N_STARS:         144
X_OFFSET:        358 [pixels]
Y_OFFSET:        199 [pixels]
X_MAX:           1797 [pixels]
Y_MAX:           1638 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00993768000msufc0876.fits
SUN_POSTN:       158.44d {+10h 33m 45s}   +9.05d {+09d 03' 05"}
SUN_DIST:         82.22 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      296.85d {+19h 47m 24s}  -23.58d {-23d 34' 53"}
MOON_DIST:       100.73 [deg]
MOON_ILLUM:      87 [%]
GAL_COORDS:      104.49, 35.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.19, 81.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 29 Aug 20 14:18:16 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     993768,   Seg_Num: 0
POINT_RA:        251.285d {+16h 45m 08s} (J2000)
POINT_DEC:       +72.331d {+72d 19' 52"} (J2000)
ROLL:            275.481d
IMG_START_DATE:  19090 TJD;   242 DOY;   20/08/29
IMG_START_TIME:  51251.08 SOD {14:14:11.08} UT,   876.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     620403276
X_OFFSET:        917 [pixels]
Y_OFFSET:        758 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1077
Y_GRB_POS:       918
BINNING_INDEX:   1
IM_URL:          sw00993768000msuni0902.fits
SUN_POSTN:       158.44d {+10h 33m 45s}   +9.05d {+09d 03' 04"}
SUN_DIST:         82.22 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      296.86d {+19h 47m 26s}  -23.58d {-23d 34' 50"}
MOON_DIST:       100.73 [deg]
MOON_ILLUM:      87 [%]
GAL_COORDS:      104.49, 35.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.19, 81.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 29 Aug 20 14:18:36 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     993768,   Seg_Num: 0
POINT_RA:        251.285d {+16h 45m 08s} (J2000)
POINT_DEC:       +72.331d {+72d 19' 52"} (J2000)
ROLL:            275.481d
IMG_START_DATE:  19090 TJD;   242 DOY;   20/08/29
IMG_START_TIME:  51251.08 SOD {14:14:11.08} UT,   876.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     620403276
X_OFFSET:        917 [pixels]
Y_OFFSET:        758 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1077
Y_GRB_POS:       918
BINNING_INDEX:   1
IM_URL:          sw00993768000msuni0902.fits
SUN_POSTN:       158.44d {+10h 33m 45s}   +9.05d {+09d 03' 03"}
SUN_DIST:         82.22 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      296.86d {+19h 47m 26s}  -23.58d {-23d 34' 49"}
MOON_DIST:       100.73 [deg]
MOON_ILLUM:      87 [%]
GAL_COORDS:      104.49, 35.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.19, 81.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #28307
M. H. Siegel (PSU), J.D. Gropp (PSU), J. A. Kennea (PSU), N. P. M. Kuin (UCL-MSSL), S. Laha (GSFC/UMBC/CRESST) and B. Sbarufatti (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 13:59:34 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 200829A (trigger=993768). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 251.212, +72.335 which is
```
   RA(J2000) = 16h 44m 51s
   Dec(J2000) = +72d 20' 07"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 30 sec. The peak count rate was ~1335 counts/sec (15-350 keV), at ~6 sec after the trigger.
The XRT began observing the field at 14:01:43.1 UT, 128.7 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 251.2096, 72.3273 which is equivalent to:
```
   RA(J2000)  = 16h 44m 50.30s
   Dec(J2000) = +72d 19' 38.3"
```
with an uncertainty of 4.7 arcseconds (radius, 90% containment). This location is 27 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy.
The initial flux in the 2.5 s image was 9.30e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 138 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	16:44:49.05 = 251.20439
  DEC(J2000) = +72:19:45.3  =  72.32924
```
with a 90%-confidence error radius of about 0.61 arc sec. This position is 9.0 arc sec. from the center of the XRT error circle. The estimated magnitude is 14.28 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.04.
Burst Advocate for this burst is M. H. Siegel (siegel AT swift.psu.edu). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 29 Aug 20 14:10:45 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     993768,   Seg_Num: 0
POINT_RA:        251.285d {+16h 45m 08s} (J2000)
POINT_DEC:       +72.331d {+72d 19' 53"} (J2000)
POINT_ROLL:      275.481d
IMG_START_DATE:  19090 TJD;   242 DOY;   20/08/29
IMG_START_TIME:  50670.91 SOD {14:04:30.91} UT,   296.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.339
N_STARS:         25
X_OFFSET:        598 [pixels]
Y_OFFSET:        439 [pixels]
X_MAX:           1557 [pixels]
Y_MAX:           1398 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00993768000msufc0296.fits
SUN_POSTN:       158.43d {+10h 33m 44s}   +9.05d {+09d 03' 10"}
SUN_DIST:         82.22 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      296.78d {+19h 47m 08s}  -23.59d {-23d 35' 15"}
MOON_DIST:       100.73 [deg]
MOON_ILLUM:      87 [%]
GAL_COORDS:      104.49, 35.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.19, 81.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 29 Aug 20 14:04:01 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     993768,   Seg_Num: 0
GRB_RA:          251.212d {+16h 44m 51s} (J2000),
                 251.135d {+16h 44m 33s} (current),
                 251.402d {+16h 45m 36s} (1950)
GRB_DEC:         +72.335d {+72d 20' 07"} (J2000),
                 +72.298d {+72d 17' 53"} (current),
                 +72.424d {+72d 25' 28"} (1950)
GRB_DATE:        19090 TJD;   242 DOY;   20/08/29
GRB_TIME:        50374.45 SOD {13:59:34.45} UT
TRIGGER_INDEX:   20000
GRB_PHI:         -33.40 [deg]
GRB_THETA:        22.68 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    11.74 [sigma]
LC_URL:          sw00993768000msb.lc
SUN_POSTN:       158.43d {+10h 33m 43s}   +9.05d {+09d 03' 17"}
SUN_DIST:         82.20 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      296.72d {+19h 46m 52s}  -23.59d {-23d 35' 36"}
MOON_DIST:       100.74 [deg]
MOON_ILLUM:      87 [%]
GAL_COORDS:      104.51, 35.18 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      130.25, 81.30 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is an image trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 74.12,10.54 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 29 Aug 20 14:04:45 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     993768,   Seg_Num: 0
POINT_RA:        251.281d {+16h 45m 07s} (J2000)
POINT_DEC:       +72.333d {+72d 19' 57"} (J2000)
POINT_ROLL:      275.478d
IMG_START_DATE:  19090 TJD;   242 DOY;   20/08/29
IMG_START_TIME:  50512.71 SOD {14:01:52.71} UT,   138.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.281
N_STARS:         44
X_OFFSET:        624 [pixels]
Y_OFFSET:        488 [pixels]
X_MAX:           1583 [pixels]
Y_MAX:           1447 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00993768000msufc0138.fits
SUN_POSTN:       158.43d {+10h 33m 43s}   +9.05d {+09d 03' 16"}
SUN_DIST:         82.22 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      296.72d {+19h 46m 54s}  -23.59d {-23d 35' 34"}
MOON_DIST:       100.72 [deg]
MOON_ILLUM:      87 [%]
GAL_COORDS:      104.49, 35.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.19, 81.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 29 Aug 20 14:05:58 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     993768,   Seg_Num: 0
POINT_RA:        251.281d {+16h 45m 07s} (J2000)
POINT_DEC:       +72.333d {+72d 19' 57"} (J2000)
ROLL:            275.478d
IMG_START_DATE:  19090 TJD;   242 DOY;   20/08/29
IMG_START_TIME:  50512.71 SOD {14:01:52.71} UT,   138.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     620402538
X_OFFSET:        918 [pixels]
Y_OFFSET:        759 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1078
Y_GRB_POS:       919
BINNING_INDEX:   1
IM_URL:          sw00993768000msuni0164.fits
SUN_POSTN:       158.43d {+10h 33m 43s}   +9.05d {+09d 03' 15"}
SUN_DIST:         82.22 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      296.74d {+19h 46m 57s}  -23.59d {-23d 35' 30"}
MOON_DIST:       100.72 [deg]
MOON_ILLUM:      87 [%]
GAL_COORDS:      104.49, 35.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.19, 81.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 29 Aug 20 14:06:11 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     993768,   Seg_Num: 0
POINT_RA:        251.281d {+16h 45m 07s} (J2000)
POINT_DEC:       +72.333d {+72d 19' 57"} (J2000)
ROLL:            275.478d
IMG_START_DATE:  19090 TJD;   242 DOY;   20/08/29
IMG_START_TIME:  50512.71 SOD {14:01:52.71} UT,   138.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     620402538
X_OFFSET:        918 [pixels]
Y_OFFSET:        759 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1078
Y_GRB_POS:       919
BINNING_INDEX:   1
IM_URL:          sw00993768000msuni0164.fits
SUN_POSTN:       158.43d {+10h 33m 43s}   +9.05d {+09d 03' 15"}
SUN_DIST:         82.22 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      296.74d {+19h 46m 57s}  -23.59d {-23d 35' 29"}
MOON_DIST:       100.72 [deg]
MOON_ILLUM:      87 [%]
GAL_COORDS:      104.49, 35.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.19, 81.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 29 Aug 20 14:05:03 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     993768,   Seg_Num: 0
POINT_RA:        251.281d {+16h 45m 07s} (J2000)
POINT_DEC:       +72.333d {+72d 19' 57"} (J2000)
POINT_ROLL:      275.478d
IMG_START_DATE:  19090 TJD;   242 DOY;   20/08/29
IMG_START_TIME:  50512.71 SOD {14:01:52.71} UT,   138.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.281
N_STARS:         44
X_OFFSET:        624 [pixels]
Y_OFFSET:        488 [pixels]
X_MAX:           1583 [pixels]
Y_MAX:           1447 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00993768000msufc0138.fits
SUN_POSTN:       158.43d {+10h 33m 43s}   +9.05d {+09d 03' 16"}
SUN_DIST:         82.22 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      296.73d {+19h 46m 55s}  -23.59d {-23d 35' 33"}
MOON_DIST:       100.72 [deg]
MOON_ILLUM:      87 [%]
GAL_COORDS:      104.49, 35.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.19, 81.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 29 Aug 20 14:02:12 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     993768,   Seg_Num: 0
GRB_RA:          251.2096d {+16h 44m 50.30s} (J2000),
                 251.1330d {+16h 44m 31.92s} (current),
                 251.3990d {+16h 45m 35.75s} (1950)
GRB_DEC:         +72.3273d {+72d 19' 38.2"} (J2000),
                 +72.2902d {+72d 17' 24.6"} (current),
                 +72.4165d {+72d 24' 59.5"} (1950)
GRB_ERROR:       4.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       9.30e-09 [erg/cm2/sec]
GRB_SIGNIF:      14.86 [sigma]
IMG_START_DATE:  19090 TJD;   242 DOY;   20/08/29
IMG_START_TIME:  50503.11 SOD {14:01:43.11} UT,   128.7 [sec] since BAT Trigger Time
TAM[0-3]:        327.68 237.12 261.64 243.57
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       158.43d {+10h 33m 43s}   +9.06d {+09d 03' 18"}
SUN_DIST:         82.20 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      296.70d {+19h 46m 48s}  -23.60d {-23d 35' 42"}
MOON_DIST:       100.73 [deg]
MOON_ILLUM:      87 [%]
GAL_COORDS:      104.50, 35.19 [deg] galactic lon,lat of the burst
ECL_COORDS:      130.30, 81.30 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.47 arcmin from the BAT position.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 29 Aug 20 14:08:42 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     993768,   Seg_Num: 0
GRB_RA:          251.2043d {+16h 44m 49.03s} (J2000),
                 251.1277d {+16h 44m 30.64s} (current),
                 251.3938d {+16h 45m 34.50s} (1950)
GRB_DEC:         +72.3292d {+72d 19' 45.1"} (J2000),
                 +72.2921d {+72d 17' 31.4"} (current),
                 +72.4185d {+72d 25' 06.4"} (1950)
GRB_ERROR:       0.6 [arcsec radius, statistical only]
GRB_MAG:         14.27 +/- 0.14 [mag]
FILTER:          10, White
IMG_START_DATE:  19090 TJD;   242 DOY;   20/08/29
IMG_START_TIME:  50509.00 SOD {14:01:49.00} UT,   134.6 [sec] since BAT Trigger Time
SUN_POSTN:       158.43d {+10h 33m 44s}   +9.05d {+09d 03' 12"}
SUN_DIST:         82.20 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      296.76d {+19h 47m 03s}  -23.59d {-23d 35' 21"}
MOON_DIST:       100.74 [deg]
MOON_ILLUM:      87 [%]
GAL_COORDS:      104.50, 35.19 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      130.29, 81.30 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The UVOT position is 8.6 arcsec from the XRT position.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 29 Aug 20 14:10:58 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     993768,   Seg_Num: 0
POINT_RA:        251.285d {+16h 45m 08s} (J2000)
POINT_DEC:       +72.331d {+72d 19' 53"} (J2000)
POINT_ROLL:      275.481d
IMG_START_DATE:  19090 TJD;   242 DOY;   20/08/29
IMG_START_TIME:  50670.91 SOD {14:04:30.91} UT,   296.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.339
N_STARS:         25
X_OFFSET:        598 [pixels]
Y_OFFSET:        439 [pixels]
X_MAX:           1557 [pixels]
Y_MAX:           1398 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00993768000msufc0296.fits
SUN_POSTN:       158.43d {+10h 33m 44s}   +9.05d {+09d 03' 10"}
SUN_DIST:         82.22 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      296.79d {+19h 47m 08s}  -23.59d {-23d 35' 14"}
MOON_DIST:       100.73 [deg]
MOON_ILLUM:      87 [%]
GAL_COORDS:      104.49, 35.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.19, 81.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #28308
A. Pozanenko (IKI), I. Reva (FAPHI), A. Serebryanskiy (FAPHI), S. Belkin (IKI), M. Krugov (FAPHI), E. Mazaeva (IKI), A. Volnova (IKI) report on behalf of IKI-GRB-FuN:
We are observing the afterglow of GRB 200829A (Siegel et al. GCN 28307) with Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory starting on Aug. 29 (UT) 14:49:05. The afterglow is clearly visible in single images of 60 s exposure. Preliminary photometry of the afterglow is R=16.8 +/- 0.1 at mid time (UT) 15:00:41.
Observations is continuing.
GCN Circular #28309
V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA),
R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias),
D. Buckley (South African Astronomical Observatory),
O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University)
MASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Swift GRB 200829A ( M. H. Siegel et al., GCN 28307) errorbox 12423 sec after notice time and 12502 sec after trigger time at 2020-08-29 17:27:56 UT, with upper limit up to 18.5 mag. Observations started at twilight. The observations began at zenith distance = 30 deg. The sun altitude is -11.7 deg.
The galactic latitude b = 35 deg., longitude l = 104 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1429750
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

   12592 |      MASTER-Tavrida |   C |   180 | 18.5 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.

GCN Circular #28311
N.P.M. Kuin (MSSL-UCL) and M. H. Siegel (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 200829A 138 s after the BAT trigger (Siegel et al., GCN Circ. 28307). The UV-optical source position is RA=251.204709, Dec=72.329356 deg (J2000) which is in sexagesimal:

RA(J2000) = 16h 44m 49.14s
Dec(J2000) = 72d 19' 45.63"

with a positional uncertainty of 0.35" radius (90% confidence).
Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white              138          288          147         14.29 +/- 0.02
white              576          596           19         15.43 +/- 0.04
white             1527         1547           19         16.38 +/- 0.06
v                  626          646           19         15.50 +/- 0.10
b                  552          572           19         15.68 +/- 0.07
u                  296          546          246         14.54 +/- 0.03
u                  700          720           19         15.12 +/- 0.07
w1                 675          696           19         15.19 +/- 0.12
m2                1080         1100           19         16.25 +/- 0.25
w2                1032         1398           39         17.64 +/- 0.30

Note that the times are since the BAT trigger time. The main burst took place around 60s earlier during a Swift Slew.
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.04 in the direction of the burst (Schlegel et al. 1998).

GCN Circular #28313
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 1810 s of XRT Photon Counting mode data and 4 UVOT images for GRB 200829A, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 251.20605, +72.32921 which is equivalent to:
```
RA (J2000): 16h 44m 49.45s
Dec (J2000): +72d 19' 45.2"
```
with an uncertainty of 1.7 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #28314
A. Ursi (INAF/IAPS), C. Pittori (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Argan, M. Cardillo, C. Casentini, Y. Evangelista, G. Piano (INAF/IAPS), F. Lucarelli, F. Verrecchia (SSDC, and INAF/OAR), A. Bulgarelli, V. Fioretti, F. Fuschino, N. Parmiggiani (INAF/OAS-Bologna), M. Marisaldi (INAF/OAS-Bologna, and Bergen University), M. Pilia, A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), F. Longo (Univ. Trieste and INFN Trieste), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team:
The AGILE Mini-CALorimeter (MCAL) detected GRB 200829A at T0 = 2020-08-29 13:58:30.90 +/- 0.01 s (UTC), reported by Swift-BAT (Siegel et al., GCN #28307) and Swift-UVOT (Kuin et al., GCN #28311).
The event lasted about 5.6 s and it released a total number of ~15550 counts in the detector (in the 0.4-100 MeV energy range), above an average background rate of 570 Hz.
The time-integrated spectrum of the burst can be fitted in the energy range 0.4-20 MeV with a single power-law with ph.ind. = 2.26 -0.03/+0.03, resulting in a reduced chi-squared of 1.67 (62 d.o.f.) and a fluence of 6.2e-05 ergs/cm^2 (90% confidence level), in the same energy range. The MCAL light curve can be found at http://www.agilescienceapp.it/notices/GRB_069336_525794310.907011.png .
The event is also clearly visible in the scientific ratemeters (RMs) of the SuperAGILE (18-60 keV), MCAL (0.4-100 MeV), and Anti-Coincidence (50-200 keV) detectors. Their light curves can be found at http://www.agilescienceapp.it/notices/GRB200829A_AGILE_RMs.png .
The AGILE/MCAL detector is a CsI detector with a 4 pi FoV, sensitive in the energy range 0.4-100 MeV. Additional analysis of AGILE data is in progress. Automatic MCAL GRB alert Notices can be found at: https://gcn.gsfc.nasa.gov/agile_mcal.html.
GCN Circular #28315
V. Lipunov, N.Tyurina, E. Gorbovskoy, V.Kornilov, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA),
R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias),
D. Buckley (South African Astronomical Observatory),
O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University)
MASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Swift GRB 200829A ( M. H. Siegel et al., GCN 28307) errorbox 12423 sec after notice time and 12502 sec after trigger time at 2020-08-29 17:27:56 UT, with upper limit up to 18.5 mag.
We see OT at Swift/UVOT position (Kuin et al GCN 28311).
```
Datetime:  2020-08-29 17:36:40
Coord:     16h 44m 48.88s , +72d 19m 45s.8
Mag:       18.1
```
Observations started at twilight. The observations began at zenith distance = 30 deg. The sun altitude is -11.7 deg.
GCN Circular #28316
GRB200829A: optical afterglow detection from Konkoly Observatory
J. Vinko, K. Vida, A. Pal, L. Kriskovics, R. Szakats, A. Ordasi and K. Sarneczky (Konkoly Observatory, Hungary) report:
The optical afterglow of GRB 200829A (Siegel et al. GCN 28307) is detected with the 0.8m RC80 robotic telescope at Piszkesteto Station of Konkoly Observatory starting on Aug 29 19:22:00 UT, 19346 s after the Swift/BAT trigger. The afterglow is measured on stacked Sloan r'- and i'-band frames of 3x300 s exposure.
Photometry, tied to nearby comparison stars with PS1 magnitudes, gives. r' = 18.45 +/- 0.09 and i' = 18.49 +/- 0.11 mag, in accord with previous optical detections (Pozanenko et al. GCN 28308; Kuin et al. GCN 28311; Ursi et al. GCN 28314; Lipunov et al. GCN 28315)..
GCN Circular #28317
J. D. Gropp (PSU), J.A. Kennea (PSU), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), T. Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB), A. Tohuvavohu (U. Toronto) and M.H. Siegel report on behalf of the Swift-XRT team:
We have analysed 6.8 ks of XRT data for GRB 200829A (Siegel et al. GCN Circ. 28307), from 135 s to 24.2 ks after the BAT trigger. The data comprise 1.7 ks in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 28313).
The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=0.62 (+0.09, -0.10). At T+279 s the decay steepens to an alpha of 8.0 (+0.0, -6.9). The light curve breaks again at T+283 s to a decay with alpha=0.885 (+0.016, -0.017), before a final break at T+1174 s s after which the decay index is 1.19 (+/-0.04).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.700 (+/-0.014). The best-fitting absorption column is 9.9 (+/-0.4) x 10^20 cm^-2, in excess of the Galactic value of 4.7 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.89 (+/-0.09) and a best-fitting absorption column of 1.36 (+0.28, -0.26) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.7 x 10^-11 (4.5 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.36 (+0.28, -0.26) x 10^21 cm^-2
Galactic foreground: 4.7 x 10^20 cm^-2
Excess significance: 5.6 sigma
Photon index:	     1.89 (+/-0.09)
```
If the light curve continues to decay with a power-law decay index of 1.19, the count rate at T+24 hours will be 0.23 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 8.4 x 10^-12 (1.0 x 10^-11) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00993768.
This circular is an official product of the Swift-XRT team.
GCN Circular #28318
Veli-Pekka Hentunen and Markku Nissinen (Taurus Hill
Observatory, Varkaus, Finland) report:
We have detected GRB 200829A optical afterglow at Taurus Hill Observatory (A95) using C-14SC 0.35-m f/7.3 telescope, SBIG STT-8300M CCD and RGB filters. The observations were started at 2020-08-29 18:48:29 (UT).
The afterglow was detected at the position RA 16 44 49.16 and DEC +72 19 45.9.
The following magnitudes were obtained from the observations using NOMAD1 1623-0124683 (R=17.05, V=17.32, B=17.55) as a comparison star:
Tmid(h:min:sec)+T0 Filter Exp.time(sec) Mag MagErr
4:53:37 R 3x180 17.98 0.28
5:02:49 R 3x180 18.11 0.34
5:12:36 R 3x180 18.22 0.27
5:25:05 R 5x180 18.26 0.17
6:00:06 R 5x180 18.27 0.14
6:25:44 B 3x180 18.66 0.21
6:35:32 G 3x180 18.69 0.26
URL link for the RGB image: www.kassiopeia.net/wp-content/uploads/2020/08/GRB200829A_RGB_web.png
GCN Circular #28322
A. S. Moskvitin, V. N. Aitov (SAO RAS) on behalf of GRB follow-up team report.
We observed the field of the GRB 200829A (Siegel et al., GCN 28307) with Zeiss-1000 (1-m telescope of SAO RAS) equipped with Multi-Mode Photometer-Polarimeter (MMPP). We obtained 4 x 300 sec. frames in Rc band and similar sequence in Ic band.
The OT (Siegel et al., GCN 28307; Pozanenko et al., GCN 28308; Kuin and Siegel, GCN 28311; Lipunov et al., GCN 28315; Vinko et al., 28316; Hentunen and Nissinen, GCN 28318) is clearly detected with the brightness R = 17.84 +/- 0.09 (T_mid - T0 = 4.587 h), I = 17.65 +/- 0.09 (T_mid - T0 = 4.204 h). Preliminary photometry is based on R2 and I magnitudes of nearby USNO-B1 stars.
GCN Circular #28323
A. Ridnaia, S. Golenetskii, R. Aptekar, D. Frederiks, M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, report:
The long-duration, very bright GRB 200829A (Swift detection: Siegel et al., GCN 28307; Goad et al., GCN 28313; Gropp et al., GCN 28317; AGILE/MCAL detection: Ursi et al., GCN 28314) triggered Konus-Wind at T0=50309.99 s UT (13:58:29.990).
The burst light curve shows a bright, multi-peaked pulse which started at ~T0-24 s and had a total duration of ~39 s. A weak post-burst emission is visible in the 18-70 keV band up to the end of the KW trigger record at ~T0+250 s. The emission is seen up to ~10 MeV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB200829_T50309/
As observed by Konus-Wind, the burst had a fluence of 3.02(-0.07,+0.07)x10^-4 erg/cm2, and a 64-ms peak flux, measured from T0+3.456 s, of 1.08(-0.07,+0.07)x10^-4 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the burst (measured from T0 to T0+16.384 s) can be described, in the 20 keV - 15 MeV range, by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.49(-0.03,+0.03), the high energy photon index beta = -2.34(-0.05,+0.04), the peak energy Ep = 336(-11,+11) keV (chi2 = 163/98 dof).
The spectrum near the maximum count rate (measured from T0+3.072 to T0+3.840 s) is best fit in the 20 keV - 15 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.23(-0.07,+0.08), the high energy photon index beta = -2.17(-0.06,+0.06), the peak energy Ep = 372(-26,+27) keV (chi2 = 78/71 dof).
We note, that this burst is very similar to GRB 200826B, which, as detected by KW (Ridnaia et al., GCN 28304), had the time-integrated spectrum with alpha = -0.54, beta = -2.38, Ep = 337 keV; a factor of ~1.5 smaller energy fluence (~2.0x10^-4 erg/cm^2), and a factor of ~2 smaller peak energy flux ~5x10^-5 erg/cm^2/s. Interestingly, light curves of both bursts are also very similar if we scale the time axis by a factor of ~1.5 (http://www.ioffe.ru/LEA/GRBs/GRB200829_T50309/gWind64_29A_26B.pdf). Given the angular distance between the directions to GRB 200829A (Swift-XRT GCN 28307) and GRB 200826B (IPN GCN 28303) of ~38.6 arcdeg, and the ~3 day difference in the burst arrival times, an idea of a lensed GRB cannot be excluded.
All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
GCN Circular #28324
Z.P. Zhu, S.Y Fu, X. Liu, D. Xu (NAOC), X. Gao (Urumqi No.1 Senior High School), X. Zhang, J.Z. Liu (XAO) report:
We observed the field of GRB 200829A (Siegel et al., GCN 28307) using the NEXT-0.6m telescope located at Nanshan, Xinjiang, China. We obtained a series of frames in the Sloan g-/r-/i- bands, starting at 19:55:23 UT on 2020-08-29, i.e., 5.93 hr after the BAT trigger.
The GRB optical afterglow (e.g., Pozanenko et al., GCN 28308; Kuin et al., GCN 28311; Ursi et al., GCN 28314; Lipunov et al., GCN 28315; Vinko et al., GCN 28316; Hentunen & Nissinen, GCN 28318; Moskvitin et al., GCN 28322) is clearly detected in our images.
Preliminary photometric measurements are as follows:
```
Filter	      T-mid(hr)  Mag    Mag_err
SDSS-g	6.72	    18.89	0.04
SDSS-r	5.98	    18.77	0.04
SDSS-i	6.40	    18.50	0.05
```
calibrated with nearby Pan-STARRS stars.
GCN Circular #28325
D. M. Palmer (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), T. Sakamoto (AGU), M. H. Siegel (PSU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 200829A (trigger #993768) (Siegel, et al., GCN Circ. 28307). The BAT ground-calculated position is RA, Dec = 251.136, 72.363 deg which is
```
   RA(J2000)  =  16h 44m 32.7s
   Dec(J2000) = +72d 21' 45.6"
```
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 88%.
The mask weighted light curve shows a peak at ~ T-60 s followed by an extended emission. The duration of the initial bright peak is ~15 sec. We note that Swift was slewing from T-150 s to T s. The overall structure starts at ~T-75 s and lasts till ~T+200 s. T90 (15-350 keV) is 13.04 +- 2.91 sec (estimated error including systematics).
The time-averaged spectrum from T-74 to T+204 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 0.83 +- 0.03. The fluence in the 15-150 keV band is 5.1 +- 0.1 x 10^-5 erg/cm2. The 1-sec peak photon flux measured from T-60.07 sec in the 15-150 keV band is 98.7 +- 1.6 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/993768/BA/
GCN Circular #28326
S. Lesage (UAH) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 13:58:14.66 UT on 29 August 2020, the Fermi Gamma-Ray Burst Monitor (GBM)
triggered and located GRB 200829A (trigger 620402299 / 200829582)
which was also detected by the Swift Burst Alert Telescope (BAT)
(M. H. Siegel et al. 2020, GCN 28307). GBM initially triggered on a weak
spike ~15-20 s before the very bright emission. The GBM on-ground location
is consistent with the Swift BAT position.
The angle from the Fermi LAT boresight at the GBM trigger time is ~148 degrees.
The GBM light curve shows an exceptionally bright long GRB
with a duration (T90) of about 6.9 s (50-300 keV).
The time-averaged spectrum from T0+16.64 s to T0+25.856 s is
best fit by a Band function with Epeak = 336.8 +/- 4.3 keV,
alpha = -0.43 +/- 0.01, and beta = -2.4 +/- 0.02
The event fluence (10-1000 keV) in this time interval is
(2.069 +/- 0.009)E-04 erg/cm^2.
The 1.024-sec peak photon flux measured starting from T0+19.7 s in
the 10-1000 keV band is 213.9 +/- 1.7 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog:
https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
For Fermi GBM data and info, please visit the official Fermi GBM Support Page:
https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
GCN Circular #28328
A. S. Moskvitin, V. N. Aitov (SAO RAS) on behalf of GRB follow-up team report.
We observed the field of the GRB 200829A (Siegel et al., GCN 28307) with Zeiss-1000 (1-m telescope of SAO RAS) equipped with Multi-Mode Photometer-Polarimeter (MMPP) on August 30. We obtained 5 x 300 sec. frames in Rc band and similar sequence in Ic band.
The OT (Siegel et al., GCN 28307; Pozanenko et al., GCN 28308; Kuin and Siegel, GCN 28311; Lipunov et al., GCN 28315; Vinko et al., 28316; Hentunen and Nissinen, GCN 28318; Zhu et al., GCN 28324) is clearly detected in individual images as well as stacked frames with the brightness of R = 20.37 +/- 0.13 (T_mid - T0 = 1.1492 days), I = 20.14 +/- 0.10 (T_mid - T0 = 1.1662 days). Preliminary photometry is based on R2 and I magnitudes of the same nearby USNO-B1 stars (Moskvitin and Aitov, GCN 28322).
GCN Circular #28329
N. Pankov (HSE), A. Novichonok (Petrozavodsk State University, KIAM), A. Zhornichenko (KIAM), A. Pozanenko (IKI), S. Belkin (IKI), E. Mazaeva (IKI), A. Volnova (IKI), Sh. Ehgamberdiev (UBAI) report on behalf of IKI-GRB-FuN:
We observed the field of a GRB 200829A (Siegel et al., GCN 28307; see also Ursi et al., GCN 28314; Ridnaia et al., GCN 28323; Lesage et al., GCN 28326) with Kitab-ISON RC-36 telescope in R-filter. We do not detect optical afterglow (Siegel et al., GCN 28307; Pozanenko et al., GCN 28308; Kuin and Siegel, GCN 28311; Lipunov et al., GCN 28315; Vinko et al., 28316; Hentunen et al., GCN 28318; Zhu et al., GCN 28324; Moskvitin et al., GCNs 28322, 28328). Preliminary photometry of the filed is following
```
Date,      UT start, t-T0,    Exp.,  Filter, OT,   Err.,  UL
                     (mid, days)

2020-08-30  15:57:25 1.08184  3600   R       n/d    n/d   18.8
```
The photometry is based on nearby USNO-B1.0 star, R2 magnitude
```
USNO_B10_id      R2
1626-0124132     14.76
```
GCN Circular #28330
Z.P. Zhu, S.Y Fu, X. Liu, D. Xu (NAOC), X. Gao (Urumqi No.1 Senior High School), X. Zhang, J.Z. Liu (XAO) report:
We continued to observe the optical afterglow (e.g., Siegel et al., GCN 28307; Pozanenko et al., GCN 28308; Kuin and Siegel, GCN 28311; Lipunov et al., GCN 28315; Vinko et al., 28316; Hentunen et al., GCN 28318; Zhu et al., GCN 28324; Moskvitin et al., GCNs 28322, 28328; Pankov et al., GCN 28329) of GRB 200829A (Siegel et al., GCN 28307; Ursi et al., GCN 28314; Ridnaia et al., GCN 28323; Lesage et al., GCN 28326), using the NEXT-0.6m telescope located at Nanshan, Xinjiang, China. We obtained 28 frames in the Sloan r band, starting at 15:24:17 UT on 2020-08-30, i.e., about 1.058 d after the BAT trigger.
Preliminary photometric measurements are as follows:
```
Filter	        T_exp/s	T_mid/d	Mag	     Mag_err
SDSS-r	8x120	1.062       >20.6
SDSS-r	20x120	1.307       21.20        0.16
```
calibrated with nearby Pan-STARRS stars.
GCN Circular #28331
L. Izzo (DARK/NBI) reports:
We observed the field of GRB 200829A (Siegel et al., GCN #28307; Ursi et al., GCN #28314; Ridnaia et al., GCN #28323; Lesage & Meegan, GCN #28326) with the IO:O camera mounted on the 2-m Liverpool Telescope located in La Palma, Spain. Observations started on August 29 at 20:31:39 UT (0.272 days after the GRB trigger) and a second epoch was obtained on August 30 at 22:38:42 UT (1.362 days). In both epochs, we obtained a series of 5x60s images in the griz filters. The optical afterglow (Siegel et al., GCN #28307, Pozanenko et al., GCN #28308; Kuin & Siegel, GCN #28311; Lipunov et al., GCN #28315; Vinko et al., GCN #28316; Hentunen et al., GCN #28318; Moskvitin et al., GCN #28322, GCN #28328, Zhu et al., GCN #28324, GCN #28330; Pankov et al., GCN #28329) is visible in the stacked images in both epochs. We measure the following preliminary AB magnitudes, calibrated against Pan-STARRS catalog stars:
```
Filter      mag     err     MJD

SDSS-g  18.91  0.05  (59090.855)
SDSS-g  21.17  0.09  (59091.944)
SDSS-r  18.76  0.04  (59090.860)
SDSS-r  21.34  0.10  (59091.948)
SDSS-i  18.65  0.04  (59090.865)
SDSS-i  21.25  0.09  (59091.953)
SDSS-z  18.57  0.04  (59090.870)
SDSS-z  20.50  0.08  (59091.958)
```
GCN Circular #28333
A. Volnova (IKI), S. Naroenkov (INASAN), A. Pozanenko (IKI), N. Pankov (HSE), S. Belkin (IKI), E. Mazaeva (IKI) report on behalf of larger GRB IKI FuN collaboration:
We observed the the field of GRB 200829A (Siegel et al., GCN 28307; Ursi et al., GCN 28314; Ridnaia et al., GCN 28323; Lesage & Meegan, GCN 28326) with Zeiss-1000 1-m telescope of Koshka Observatory on August, 30 starting (UT) 19:18:21 in I- and R-filters. The optical afterglow (Siegel et al., GCN 28307, Pozanenko et al., GCN 28308; Kuin & Siegel, GCN 28311; Lipunov et al., GCN 28315; Vinko et al., GCN 28316; Hentunen et al., GCN 28318; Moskvitin et al., GCNs 28322, 28328, Zhu et al., GCN 28324, GCN 28330; Pankov et al., GCN 28329; Izzo, GCN 28331) is detected in stacked images of both filters. Preliminary photometry of the afterglow is following.
```
Date       UT start   t-T0       Filter Exp.   OT   Err.   UL
                      (mid, days)        (s)

2020-08-30 19:18:21   1.29067    I     47*120  20.14  0.20  20.8
2020-08-30 19:20:31   1.29217    R     47*120  21.0   0.25  21.4
```
The photometry is based on nearby USNO-B1.0 stars.
GCN Circular #28338
S. R. Oates (U.Birmingham), N.P.M. Kuin (MSSL-UCL), M. De Pasquale (Istanbul U.), S. Campana (INAF-OAB), A. Tohuvavohu (U Toronto) and M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
We have performed a joint spectral analysis of Swift UVOT and XRT observations of GRB 200829A (Siegel et al., GCN Circ. 28307; Kuin et al. GCN Circ. 28311, Goad et al., GCN Circ. 28313), based on the methodology of Schady et al. (2010, MNRAS, 401, 2773). Using this method, we created an SED at 900s after the BAT trigger consisting of 6 UVOT filters and WT mode XRT data. The model with the best fit, broken power-law with a Milky Way extinction curve for the host extinction, gives a photometric redshift for GRB 200829A of 1.25 +\- 0.02 (1 sigma uncertainty; chi^2/dof = 586/538).
This circular is an official product of the Swift team.
GCN Circular #28359
A. Pozanenko (IKI), N. Pankov (HSE), S. Belkin (IKI), A. Volnova (IKI), I. Reva (FAPHI), A. Zhornichenko (KIAM), A. Novichonok (Petrozavodsk State University, KIAM), S. Naroenkov (INASAN), K. Antoniuk (CrAO), R.Ya. Inasaridze (AbAO), E. Mazaeva (IKI), Sh. Ehgamberdiev (UBAI) report on behalf of larger GRB IKI FuN collaboration:
We observed the the field of GRB 200829A (Siegel et al., GCN 28307; Ursi et al., GCN 28314; Ridnaia et al., GCN 28323; Lesage & Meegan, GCN 28326) with Zeiss-1000 telescope of TShAO observatory, RC-36 telescope of Kitab observatory, Zeiss-1000 telescope of Koshka Observatory, AZT-11 telescope of CrAO observatory, and AS-23 telescope of AbAO observatory. The optical afterglow (Siegel et al., GCN 28307, Pozanenko et al., GCN 28308; Kuin & Siegel, GCN 28311; Lipunov et al., GCN 28315; Vinko et al., GCN 28316; Hentunen et al., GCN 28318; Moskvitin et al., GCNs 28322, 28328, Zhu et al., GCNs 28324, 28330; Pankov et al., GCN 28329; Izzo, GCN 28331; Volnova et al., GCN 28333) is detected on first two days after GRB trigger. Preliminary light curve of the afterglow in R-filter can be found at
http://grb.rssi.ru/GRB200829A/GRB200829A_LC1_R.png
One can tentatively assume a jet break in the light curve at ~0.33 days.
(The photometry is based on nearby USNO-B1.0 stars identical for all observations.)
GCN Circular #28404
De Pasquale, M. (Istanbul Univ.) Sonbas, E. (Adiyaman Univ.), Ozdonmez, A., Er, H. (Ataturk Univ.), Ivantsov, A., (Akdeniz Univ.), Eryilmaz, S. (TUG) on behalf of a larger collaboration:
We observed the field of GRB 200829A (Siegel et al., GCN #28307) with the 1.0 meter T100 telescope (TUBITAK National Observatory, Antalya - Turkey), starting on 2020-09-01, at 20:36:18 UT (~78 hours after the trigger). We obtained 12 x 300 s exposures with R filter under good weather conditions. The Moon was present in the sky during observations.
We do not detect an optical afterglow within the reported XRT error circle down to a 3 sigma limiting magnitude of 21 in the combined R band image.
We are grateful to the TUBITAK National Observatory staff for promptly scheduling the observations and their technical support.

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Jochen Greiner, last update: 09-Sep-2020 [Disclaimer]