Gamma-ray Burst 200109A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE 
NOTICE_DATE:     Thu 09 Jan 20 01:47:11 UT 
NOTICE_TYPE:     Swift-BAT GRB Position 
TRIGGER_NUM:     948361,   Seg_Num: 0 
GRB_RA:          307.171d {+20h 28m 41s} (J2000), 
                 307.310d {+20h 29m 14s} (current), 
                 306.825d {+20h 27m 18s} (1950) 
GRB_DEC:         +53.003d {+53d 00' 12"} (J2000), 
                 +53.071d {+53d 04' 14"} (current), 
                 +52.836d {+52d 50' 08"} (1950) 
GRB_ERROR:       3.00 [arcmin radius, statistical only] 
GRB_INTEN:       19961 [cnts]    Image_Peak=761 [image_cnts] 
TRIGGER_DUR:     8.192 [sec]  
TRIGGER_INDEX:   477     E_range: 25-100 keV 
BKG_INTEN:       129100 [cnts] 
BKG_TIME:        6287.77 SOD {01:44:47.77} UT 
BKG_DUR:         64 [sec] 
GRB_DATE:        18857 TJD;     9 DOY;   20/01/09 
GRB_TIME:        6376.21 SOD {01:46:16.21} UT 
GRB_PHI:         -179.97 [deg] 
GRB_THETA:        15.25 [deg] 
SOLN_STATUS:     0x20000003 
RATE_SIGNIF:     19.57 [sigma] 
IMAGE_SIGNIF:    12.72 [sigma] 
MERIT_PARAMS:     +1  +0  +0  +3  +2  +2  +0  +1 -23  +0  
SUN_POSTN:       289.76d {+19h 19m 03s}  -22.19d {-22d 11' 35"} 
SUN_DIST:         76.79 [deg]   Sun_angle= -1.2 [hr] (East of Sun) 
MOON_POSTN:       85.75d {+05h 43m 01s}  +22.21d {+22d 12' 24"} 
MOON_DIST:        96.55 [deg] 
MOON_ILLUM:      96 [%] 
GAL_COORDS:       89.28,  8.26 [deg] galactic lon,lat of the burst (or transient) 
ECL_COORDS:      341.42, 67.44 [deg] ecliptic lon,lat of the burst (or transient) 
COMMENTS:        SWIFT-BAT GRB Coordinates.   
COMMENTS:        This is a rate 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 = 118.28,-2.14 [deg].   
COMMENTS:            
COMMENTS:        NOTE: This BAT event is temporally(25.0<100sec) coincident with the FERMI_GBM event (trignum=600227156).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 09 Jan 20 01:46:15 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     600227156
GRB_RA:          301.517d {+20h 06m 04s} (J2000),
                 301.636d {+20h 06m 33s} (current),
                 301.217d {+20h 04m 52s} (1950)
GRB_DEC:         +55.200d {+55d 12' 00"} (J2000),
                 +55.258d {+55d 15' 30"} (current),
                 +55.055d {+55d 03' 18"} (1950)
GRB_ERROR:       23.30 [deg radius, statistical plus systematic]
GRB_INTEN:       157 [cnts/sec]
DATA_SIGNIF:     7.50 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        18857 TJD;     9 DOY;   20/01/09
GRB_TIME:        6351.89 SOD {01:45:51.89} UT
GRB_PHI:          25.00 [deg]
GRB_THETA:        55.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.58
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      87%  GRB
2nd_MOST_LIKELY:   7%  Cyg X-1
DETECTORS:       0,0,1, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       289.76d {+19h 19m 02s}  -22.19d {-22d 11' 35"}
SUN_DIST:         78.11 [deg]   Sun_angle= -0.8 [hr] (East of Sun)
MOON_POSTN:       85.74d {+05h 42m 59s}  +22.21d {+22d 12' 20"}
MOON_DIST:        96.71 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:       89.34, 12.24 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      338.13, 71.25 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200109074/quicklook/glg_lc_medres34_bn200109074.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 35.38,22.12 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 09 Jan 20 01:46:32 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     600227156
GRB_RA:          302.670d {+20h 10m 41s} (J2000),
                 302.814d {+20h 11m 15s} (current),
                 302.311d {+20h 09m 15s} (1950)
GRB_DEC:         +50.260d {+50d 15' 36"} (J2000),
                 +50.320d {+50d 19' 13"} (current),
                 +50.110d {+50d 06' 38"} (1950)
GRB_ERROR:       14.95 [deg radius, statistical only]
DATA_SIGNIF:     8.00 [sigma]
DATA_INTERVAL:   1.024 [sec]
GRB_DATE:        18857 TJD;     9 DOY;   20/01/09
GRB_TIME:        6351.89 SOD {01:45:51.89} UT
GRB_PHI:          25.00 [deg]
GRB_THETA:        60.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       289.76d {+19h 19m 02s}  -22.19d {-22d 11' 35"}
SUN_DIST:         73.43 [deg]   Sun_angle= -0.9 [hr] (East of Sun)
MOON_POSTN:       85.75d {+05h 42m 59s}  +22.21d {+22d 12' 21"}
MOON_DIST:       100.42 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:       85.41,  9.08 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      331.43, 66.86 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200109074/quicklook/glg_lc_medres34_bn200109074.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_600227156.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 09 Jan 20 01:55:11 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     600227156
GRB_RA:          284.700d {+18h 58m 48s} (J2000),
                 284.677d {+18h 58m 43s} (current),
                 284.755d {+18h 59m 01s} (1950)
GRB_DEC:         +68.860d {+68d 51' 36"} (J2000),
                 +68.888d {+68d 53' 18"} (current),
                 +68.789d {+68d 47' 21"} (1950)
GRB_ERROR:       10.41 [deg radius, statistical only]
GRB_DATE:        18857 TJD;     9 DOY;   20/01/09
GRB_TIME:        6351.89 SOD {01:45:51.89} UT
GRB_PHI:          19.00 [deg]
GRB_THETA:        40.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       289.77d {+19h 19m 04s}  -22.19d {-22d 11' 32"}
SUN_DIST:         91.16 [deg]   Sun_angle= 0.3 [hr] (West of Sun)
MOON_POSTN:       85.83d {+05h 43m 20s}  +22.22d {+22d 12' 56"}
MOON_DIST:        87.87 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:       99.59, 24.52 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       29.11, 83.99 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200109074/quicklook/glg_lc_medres34_bn200109074.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200109074/quicklook/glg_locplot_all_bn200109074.png
COMMENTS:        Fermi-GBM Final Position.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file should be available by the time this FINAL notice is produced.  
COMMENTS:        This notice was generated completely by automated pipeline processing.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(25.0<100sec) coincident with the SWIFT_BAT event (trignum=948361).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 09 Jan 20 01:48:40 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     948361,   Seg_Num: 0
GRB_RA:          307.1249d {+20h 28m 29.9s} (J2000),
                 307.2635d {+20h 29m 03.2s} (current),
                 306.7787d {+20h 27m 06.8s} (1950)
GRB_DEC:         +52.9945d {+52d 59' 40.2"} (J2000),
                 +53.0619d {+53d 03' 42.7"} (current),
                 +52.8271d {+52d 49' 37.6"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       33 [cnts]
IMG_START_DATE:  18857 TJD;     9 DOY;   20/01/09
IMG_START_TIME:  6479.12 SOD {01:47:59.12} UT,   102.9 [sec] since BAT Trigger Time
CENTROID_X:      272.69,  raw= 273  [pixels]
CENTROID_Y:      257.14,  raw= 257  [pixels]
ROLL:            196.53 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -96.54
GRB_POS_XRT_Z:   -81.82
IMAGE_URL:       sw00948361000msxps_rw.img
SUN_POSTN:       289.76d {+19h 19m 03s}  -22.19d {-22d 11' 34"}
SUN_DIST:         76.78 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       85.77d {+05h 43m 04s}  +22.21d {+22d 12' 30"}
MOON_DIST:        96.58 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:       89.26,  8.28 [deg] galactic lon,lat of the burst
ECL_COORDS:      341.34, 67.45 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 09 Jan 20 01:48:28 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     948361,   Seg_Num: 0
GRB_RA:          307.1249d {+20h 28m 29.97s} (J2000),
                 307.2635d {+20h 29m 03.23s} (current),
                 306.7787d {+20h 27m 06.88s} (1950)
GRB_DEC:         +52.9945d {+52d 59' 40.2"} (J2000),
                 +53.0619d {+53d 03' 42.7"} (current),
                 +52.8271d {+52d 49' 37.6"} (1950)
GRB_ERROR:       5.5 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.12e-09 [erg/cm2/sec]
GRB_SIGNIF:      5.74 [sigma]
IMG_START_DATE:  18857 TJD;     9 DOY;   20/01/09
IMG_START_TIME:  6479.12 SOD {01:47:59.12} UT,   102.9 [sec] since BAT Trigger Time
TAM[0-3]:        327.61 237.20 261.46 243.43
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       289.76d {+19h 19m 03s}  -22.19d {-22d 11' 34"}
SUN_DIST:         76.78 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       85.77d {+05h 43m 04s}  +22.21d {+22d 12' 29"}
MOON_DIST:        96.58 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:       89.26,  8.28 [deg] galactic lon,lat of the burst
ECL_COORDS:      341.34, 67.45 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.73 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Jan 20 20:02:32 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     948219,   Seg_Num: 0
POINT_RA:        107.014d {+07h 08m 03s} (J2000)
POINT_DEC:       -83.742d {-83d 44' 30"} (J2000)
ROLL:            181.346d
IMG_START_DATE:  18855 TJD;     7 DOY;   20/01/07
IMG_START_TIME:  70891.39 SOD {19:41:31.39} UT,   902.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     600118915
X_OFFSET:        613 [pixels]
Y_OFFSET:        951 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       773
Y_GRB_POS:       1111
BINNING_INDEX:   1
IM_URL:          sw00948219000msuni0927.fits
SUN_POSTN:       288.41d {+19h 13m 38s}  -22.36d {-22d 21' 26"}
SUN_DIST:         73.86 [deg]   Sun_angle= -11.9 [hr] (East of Sun)
MOON_POSTN:       68.35d {+04h 33m 24s}  +19.34d {+19d 20' 37"}
MOON_DIST:       104.39 [deg]
MOON_ILLUM:      90 [%]
GAL_COORDS:      295.95,-26.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      263.93,-72.45 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 09 Jan 20 01:50:14 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     948361,   Seg_Num: 0
GRB_RA:          307.171d {+20h 28m 41s} (J2000),
                 307.310d {+20h 29m 14s} (current),
                 306.825d {+20h 27m 18s} (1950)
GRB_DEC:         +53.003d {+53d 00' 12"} (J2000),
                 +53.071d {+53d 04' 14"} (current),
                 +52.836d {+52d 50' 08"} (1950)
GRB_DATE:        18857 TJD;     9 DOY;   20/01/09
GRB_TIME:        6376.21 SOD {01:46:16.21} UT
TRIGGER_INDEX:   477
GRB_PHI:         -179.97 [deg]
GRB_THETA:        15.25 [deg]
DELTA_TIME:      -43.00 [sec]
TRIGGER_DUR:     8.192 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     19.57 [sigma]
IMAGE_SIGNIF:    12.72 [sigma]
LC_URL:          sw00948361000msb.lc
SUN_POSTN:       289.76d {+19h 19m 03s}  -22.19d {-22d 11' 34"}
SUN_DIST:         76.79 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       85.78d {+05h 43m 08s}  +22.21d {+22d 12' 36"}
MOON_DIST:        96.56 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:       89.28,  8.26 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      341.42, 67.44 [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 a rate 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 = 118.28,-2.14 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 09 Jan 20 01:48:43 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     948361,   Seg_Num: 0
GRB_RA:          307.1249d {+20h 28m 29.9s} (J2000),
                 307.2635d {+20h 29m 03.2s} (current),
                 306.7787d {+20h 27m 06.8s} (1950)
GRB_DEC:         +52.9945d {+52d 59' 40.2"} (J2000),
                 +53.0619d {+53d 03' 42.7"} (current),
                 +52.8271d {+52d 49' 37.6"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       33 [cnts]
IMG_START_DATE:  18857 TJD;     9 DOY;   20/01/09
IMG_START_TIME:  6479.12 SOD {01:47:59.12} UT,   102.9 [sec] since BAT Trigger Time
CENTROID_X:      272.69,  raw= 273  [pixels]
CENTROID_Y:      257.14,  raw= 257  [pixels]
ROLL:            196.53 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -96.54
GRB_POS_XRT_Z:   -81.82
IMAGE_URL:       sw00948361000msxps_rw.img
SUN_POSTN:       289.76d {+19h 19m 03s}  -22.19d {-22d 11' 34"}
SUN_DIST:         76.78 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       85.77d {+05h 43m 05s}  +22.21d {+22d 12' 30"}
MOON_DIST:        96.58 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:       89.26,  8.28 [deg] galactic lon,lat of the burst
ECL_COORDS:      341.34, 67.45 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 09 Jan 20 01:54:02 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     948361,   Seg_Num: 0
POINT_RA:        307.178d {+20h 28m 43s} (J2000)
POINT_DEC:       +53.009d {+53d 00' 31"} (J2000)
POINT_ROLL:      196.525d
IMG_START_DATE:  18857 TJD;     9 DOY;   20/01/09
IMG_START_TIME:  6485.80 SOD {01:48:05.80} UT,   109.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        7.845
N_STARS:         190
X_OFFSET:        520 [pixels]
Y_OFFSET:        536 [pixels]
X_MAX:           1479 [pixels]
Y_MAX:           1495 [pixels]
DET_THRESH:      24
PHOTO_THRESH:    15
SL_URL:          sw00948361000msufc0109.fits
SUN_POSTN:       289.77d {+19h 19m 04s}  -22.19d {-22d 11' 33"}
SUN_DIST:         76.80 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       85.82d {+05h 43m 17s}  +22.21d {+22d 12' 51"}
MOON_DIST:        96.57 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:       89.29,  8.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      341.43, 67.45 [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:     Thu 09 Jan 20 01:53:42 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     948361,   Seg_Num: 0
POINT_RA:        307.178d {+20h 28m 43s} (J2000)
POINT_DEC:       +53.009d {+53d 00' 31"} (J2000)
POINT_ROLL:      196.525d
IMG_START_DATE:  18857 TJD;     9 DOY;   20/01/09
IMG_START_TIME:  6485.80 SOD {01:48:05.80} UT,   109.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        7.845
N_STARS:         190
X_OFFSET:        520 [pixels]
Y_OFFSET:        536 [pixels]
X_MAX:           1479 [pixels]
Y_MAX:           1495 [pixels]
DET_THRESH:      24
PHOTO_THRESH:    15
SL_URL:          sw00948361000msufc0109.fits
SUN_POSTN:       289.77d {+19h 19m 04s}  -22.19d {-22d 11' 33"}
SUN_DIST:         76.80 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       85.82d {+05h 43m 17s}  +22.21d {+22d 12' 50"}
MOON_DIST:        96.56 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:       89.29,  8.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      341.43, 67.45 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 09 Jan 20 01:55:22 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     948361,   Seg_Num: 0
POINT_RA:        307.178d {+20h 28m 43s} (J2000)
POINT_DEC:       +53.009d {+53d 00' 31"} (J2000)
ROLL:            196.525d
IMG_START_DATE:  18857 TJD;     9 DOY;   20/01/09
IMG_START_TIME:  6485.80 SOD {01:48:05.80} UT,   109.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     600227310
X_OFFSET:        1025 [pixels]
Y_OFFSET:        952 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1185
Y_GRB_POS:       1112
BINNING_INDEX:   1
IM_URL:          sw00948361000msuni0134.fits
SUN_POSTN:       289.77d {+19h 19m 04s}  -22.19d {-22d 11' 32"}
SUN_DIST:         76.80 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       85.84d {+05h 43m 21s}  +22.22d {+22d 12' 56"}
MOON_DIST:        96.57 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:       89.29,  8.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      341.43, 67.45 [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:     Thu 09 Jan 20 01:55:43 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     948361,   Seg_Num: 0
POINT_RA:        307.178d {+20h 28m 43s} (J2000)
POINT_DEC:       +53.009d {+53d 00' 31"} (J2000)
ROLL:            196.525d
IMG_START_DATE:  18857 TJD;     9 DOY;   20/01/09
IMG_START_TIME:  6485.80 SOD {01:48:05.80} UT,   109.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     600227310
X_OFFSET:        1025 [pixels]
Y_OFFSET:        952 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1185
Y_GRB_POS:       1112
BINNING_INDEX:   1
IM_URL:          sw00948361000msuni0134.fits
SUN_POSTN:       289.77d {+19h 19m 04s}  -22.19d {-22d 11' 32"}
SUN_DIST:         76.80 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       85.84d {+05h 43m 22s}  +22.22d {+22d 12' 58"}
MOON_DIST:        96.57 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:       89.29,  8.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      341.43, 67.45 [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:     Thu 09 Jan 20 01:57:42 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     948361,   Seg_Num: 0
POINT_RA:        307.175d {+20h 28m 42s} (J2000)
POINT_DEC:       +53.009d {+53d 00' 33"} (J2000)
POINT_ROLL:      196.521d
IMG_START_DATE:  18857 TJD;     9 DOY;   20/01/09
IMG_START_TIME:  6644.09 SOD {01:50:44.09} UT,   267.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.877
N_STARS:         161
X_OFFSET:        705 [pixels]
Y_OFFSET:        632 [pixels]
X_MAX:           1664 [pixels]
Y_MAX:           1591 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00948361000msufc0267.fits
SUN_POSTN:       289.77d {+19h 19m 04s}  -22.19d {-22d 11' 31"}
SUN_DIST:         76.80 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       85.86d {+05h 43m 26s}  +22.22d {+22d 13' 06"}
MOON_DIST:        96.58 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:       89.29,  8.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      341.43, 67.45 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 09 Jan 20 01:57:52 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     948361,   Seg_Num: 0
POINT_RA:        307.175d {+20h 28m 42s} (J2000)
POINT_DEC:       +53.009d {+53d 00' 33"} (J2000)
POINT_ROLL:      196.521d
IMG_START_DATE:  18857 TJD;     9 DOY;   20/01/09
IMG_START_TIME:  6644.09 SOD {01:50:44.09} UT,   267.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.877
N_STARS:         161
X_OFFSET:        705 [pixels]
Y_OFFSET:        632 [pixels]
X_MAX:           1664 [pixels]
Y_MAX:           1591 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00948361000msufc0267.fits
SUN_POSTN:       289.77d {+19h 19m 04s}  -22.19d {-22d 11' 31"}
SUN_DIST:         76.80 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       85.86d {+05h 43m 27s}  +22.22d {+22d 13' 06"}
MOON_DIST:        96.58 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:       89.29,  8.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      341.43, 67.45 [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:     Thu 09 Jan 20 01:59:04 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     948361,   Seg_Num: 0
POINT_RA:        307.175d {+20h 28m 42s} (J2000)
POINT_DEC:       +53.009d {+53d 00' 33"} (J2000)
ROLL:            196.521d
IMG_START_DATE:  18857 TJD;     9 DOY;   20/01/09
IMG_START_TIME:  6644.09 SOD {01:50:44.09} UT,   267.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     600227468
X_OFFSET:        1025 [pixels]
Y_OFFSET:        952 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1185
Y_GRB_POS:       1112
BINNING_INDEX:   1
IM_URL:          sw00948361000msuni0292.fits
SUN_POSTN:       289.77d {+19h 19m 05s}  -22.19d {-22d 11' 31"}
SUN_DIST:         76.80 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       85.87d {+05h 43m 30s}  +22.22d {+22d 13' 11"}
MOON_DIST:        96.58 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:       89.29,  8.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      341.43, 67.45 [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:     Thu 09 Jan 20 01:58:23 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     948361,   Seg_Num: 0
GRB_RA:          307.1258d {+20h 28m 30.19s} (J2000),
                 307.2644d {+20h 29m 03.45s} (current),
                 306.7796d {+20h 27m 07.09s} (1950)
GRB_DEC:         +52.9932d {+52d 59' 35.5"} (J2000),
                 +53.0606d {+53d 03' 38.0"} (current),
                 +52.8258d {+52d 49' 33.0"} (1950)
GRB_ERROR:       2.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18857 TJD;     9 DOY;   20/01/09
IMG_START_TIME:  6535.00 SOD {01:48:55.00} UT,   158.8 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       289.77d {+19h 19m 05s}  -22.19d {-22d 11' 31"}
SUN_DIST:         76.77 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       85.87d {+05h 43m 28s}  +22.22d {+22d 13' 08"}
MOON_DIST:        96.61 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:       89.26,  8.28 [deg] galactic lon,lat of the burst
ECL_COORDS:      341.34, 67.45 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 1.1% < P(seren) < 2.8%.

GCN Circular #26677
The Fermi GBM team reports the detection of a likely LONG GRB
At 01:45:51 UT on 9 Jan 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200109A (trigger 600227156.894404 / 200109074).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 284.7, Dec = 68.9 (J2000 degrees, equivalent to J2000 18h 58m, 68d 54'), with a statistical uncertainty of 10.4 degrees.
The angle from the Fermi LAT boresight is 40.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200109074/quicklook/glg_skymap_all_bn200109074.png
The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200109074/quicklook/glg_healpix_all_bn200109074.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200109074/quicklook/glg_lc_medres34_bn200109074.gif
GCN Circular #26678
A. Melandri (INAF-OAB), M. G. Bernardini (INAF-OAB), P. D'Avanzo (INAF-OAB), J.D. Gropp (PSU), N. J. Klingler (PSU), S Laha (GSFC/UMBC/CRESST), D. M. Palmer (LANL), M. H. Siegel (PSU), K. K. Simpson (PSU) and A. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift Observatory Team:
At 01:46:16 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 200109A (trigger=948361). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 307.171, +53.003 which is
```
   RA(J2000) = 20h 28m 41s
   Dec(J2000) = +53d 00' 12"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of 70 sec. The peak count rate was ~1600 counts/sec (15-350 keV), at ~2 sec after the trigger.
The XRT began observing the field at 01:47:59.1 UT, 102.9 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source with an enhanced position: RA, Dec 307.1258, 52.9932 which is equivalent to:
```
   RA(J2000)  = 20h 28m 30.19s
   Dec(J2000) = +52d 59' 35.5"
```
with an uncertainty of 2.2 arcseconds (radius, 90% containment). This location is 104 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at https://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 3.98 x 10^21 cm^-2 (Willingale et al. 2013).
The initial flux in the 2.5 s image was 1.12e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 109 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. Because of the density of catalogued stars, further analysis is required to report an upper limit for any afterglow in the sub-image. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.29.
Burst Advocate for this burst is A. Melandri (andrea.melandri AT brera.inaf.it). 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:     Thu 09 Jan 20 01:59:18 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     948361,   Seg_Num: 0
POINT_RA:        307.175d {+20h 28m 42s} (J2000)
POINT_DEC:       +53.009d {+53d 00' 33"} (J2000)
ROLL:            196.521d
IMG_START_DATE:  18857 TJD;     9 DOY;   20/01/09
IMG_START_TIME:  6644.09 SOD {01:50:44.09} UT,   267.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     600227468
X_OFFSET:        1025 [pixels]
Y_OFFSET:        952 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1185
Y_GRB_POS:       1112
BINNING_INDEX:   1
IM_URL:          sw00948361000msuni0292.fits
SUN_POSTN:       289.77d {+19h 19m 05s}  -22.19d {-22d 11' 31"}
SUN_DIST:         76.80 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       85.88d {+05h 43m 30s}  +22.22d {+22d 13' 12"}
MOON_DIST:        96.58 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:       89.29,  8.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      341.43, 67.45 [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:     Thu 09 Jan 20 02:04:48 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     948361,   Seg_Num: 0
POINT_RA:        307.175d {+20h 28m 42s} (J2000)
POINT_DEC:       +53.009d {+53d 00' 33"} (J2000)
POINT_ROLL:      196.521d
IMG_START_DATE:  18857 TJD;     9 DOY;   20/01/09
IMG_START_TIME:  7249.53 SOD {02:00:49.53} UT,   873.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        6.578
N_STARS:         190
X_OFFSET:        465 [pixels]
Y_OFFSET:        392 [pixels]
X_MAX:           1904 [pixels]
Y_MAX:           1831 [pixels]
DET_THRESH:      22
PHOTO_THRESH:    13
SL_URL:          sw00948361000msufc0873.fits
SUN_POSTN:       289.77d {+19h 19m 06s}  -22.19d {-22d 11' 29"}
SUN_DIST:         76.80 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       85.93d {+05h 43m 44s}  +22.23d {+22d 13' 34"}
MOON_DIST:        96.60 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:       89.29,  8.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      341.43, 67.45 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 09 Jan 20 02:06:27 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     948361,   Seg_Num: 0
POINT_RA:        307.175d {+20h 28m 42s} (J2000)
POINT_DEC:       +53.009d {+53d 00' 33"} (J2000)
ROLL:            196.521d
IMG_START_DATE:  18857 TJD;     9 DOY;   20/01/09
IMG_START_TIME:  7249.53 SOD {02:00:49.53} UT,   873.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     600228073
X_OFFSET:        1024 [pixels]
Y_OFFSET:        951 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1184
Y_GRB_POS:       1111
BINNING_INDEX:   1
IM_URL:          sw00948361000msuni0898.fits
SUN_POSTN:       289.78d {+19h 19m 06s}  -22.19d {-22d 11' 28"}
SUN_DIST:         76.79 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       85.95d {+05h 43m 48s}  +22.23d {+22d 13' 40"}
MOON_DIST:        96.60 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:       89.29,  8.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      341.43, 67.45 [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:     Thu 09 Jan 20 02:05:07 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     948361,   Seg_Num: 0
POINT_RA:        307.175d {+20h 28m 42s} (J2000)
POINT_DEC:       +53.009d {+53d 00' 33"} (J2000)
POINT_ROLL:      196.521d
IMG_START_DATE:  18857 TJD;     9 DOY;   20/01/09
IMG_START_TIME:  7249.53 SOD {02:00:49.53} UT,   873.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        6.578
N_STARS:         190
X_OFFSET:        465 [pixels]
Y_OFFSET:        392 [pixels]
X_MAX:           1904 [pixels]
Y_MAX:           1831 [pixels]
DET_THRESH:      22
PHOTO_THRESH:    13
SL_URL:          sw00948361000msufc0873.fits
SUN_POSTN:       289.77d {+19h 19m 06s}  -22.19d {-22d 11' 29"}
SUN_DIST:         76.80 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       85.93d {+05h 43m 44s}  +22.23d {+22d 13' 35"}
MOON_DIST:        96.60 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:       89.29,  8.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      341.43, 67.45 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #26679
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),
H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE),
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-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Swift GRB200109.07 (trigger No 948361,20h 28m 41.04s , +53d 00m 10.8s, R=0.05) errorbox 12 sec after notice time and 70 sec after trigger time at 2020-01-09 01:47:26 UT, with upper limit up to 17.9 mag. The observations began at zenith distance = 75 deg. The sun altitude is -31.2 deg.
The galactic latitude b = 8 deg., longitude l = 90 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1254883
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

      75 |   MASTER-Kislovodsk |  P- |    10 | 16.3 |        
      75 |   MASTER-Kislovodsk |  P| |    10 | 16.1 |        
     106 |   MASTER-Kislovodsk |  P- |    20 | 16.7 |        
     106 |   MASTER-Kislovodsk |  P| |    20 | 16.6 |        
     133 |   MASTER-Kislovodsk |  P- |    20 | 16.6 |        
     133 |   MASTER-Kislovodsk |  P| |    20 | 16.6 |        
     164 |   MASTER-Kislovodsk |  P| |    30 | 16.8 |        
     209 |   MASTER-Kislovodsk |  P| |   120 | 17.4 |  Coadd 
     205 |   MASTER-Kislovodsk |  P| |    40 | 16.8 |        
     257 |   MASTER-Kislovodsk |  P- |    50 | 17.1 |        
     322 |   MASTER-Kislovodsk |  P- |   180 | 17.9 |  Coadd 
     257 |   MASTER-Kislovodsk |  P| |    50 | 16.9 |        
     318 |   MASTER-Kislovodsk |  P- |    60 | 17.2 |        
     318 |   MASTER-Kislovodsk |  P| |    60 | 17.0 |        
     398 |   MASTER-Kislovodsk |  P| |   220 | 17.7 |  Coadd 
     390 |   MASTER-Kislovodsk |  P- |    70 | 17.4 |        
     390 |   MASTER-Kislovodsk |  P| |    70 | 17.1 |        
     477 |   MASTER-Kislovodsk |  P- |    90 | 17.4 |        
     477 |   MASTER-Kislovodsk |  P| |    90 | 17.4 |        
     584 |   MASTER-Kislovodsk |  P- |   110 | 17.5 |        
     584 |   MASTER-Kislovodsk |  P| |   110 | 17.3 |        
     710 |   MASTER-Kislovodsk |  P- |   130 | 17.6 |        
     710 |   MASTER-Kislovodsk |  P| |   130 | 17.4 |        
```
The observation and reduction will continue. The message may be cited.
GCN Circular #26681
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 406 s of XRT Photon Counting mode data and 1 UVOT images for GRB 200109A, 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 = 307.12462, +52.99363 which is equivalent to:
```
RA (J2000): 20h 28m 29.91s
Dec (J2000): +52d 59' 37.1"
```
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 #26682
V. D'Elia (ASDC), D.N. Burrows (PSU), J. D. Gropp (PSU), A. Tohuvavohu (U. Toronto), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), A. D'Ai (INAF-IASFPA) and A. Melandri report on behalf of the Swift-XRT team:
We have analysed 6.3 ks of XRT data for GRB 200109A (Melandri et al. GCN Circ. 26678), from 91 s to 24.1 ks after the BAT trigger. The data comprise 48 s in Windowed Timing (WT) mode (the first 7 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 26681).
The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=1.9 (+/-0.3). At T+216 s the decay steepens to an alpha of 8.0 (+0.0, -3.2) before breaking again at T+262 s to a final decay with index alpha=1.50 (+0.28, -0.38).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.70 (+0.32, -0.30). The best-fitting absorption column is 6.9 (+2.7, -2.2) x 10^21 cm^-2, in excess of the Galactic value of 4.0 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 5.2 x 10^-11 (7.6 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     6.9 (+2.7, -2.2) x 10^21 cm^-2
Galactic foreground: 4.0 x 10^21 cm^-2
Excess significance: 2.2 sigma
Photon index:	     1.70 (+0.32, -0.30)
```
If the light curve continues to decay with a power-law decay index of 1.50, the count rate at T+24 hours will be 1.3 x 10^-4 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 7.0 x 10^-15 (1.0 x 10^-14) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00948361.
This circular is an official product of the Swift-XRT team.
GCN Circular #26689
R. Hamburg (UAH) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 01:45:51.89 UT on 9 January 2020, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 200109A (trigger 600227156 / 200109074), which also triggered the Swift/BAT approximately 25 s later (Melandri et al. 2019, GCN 26678). The Fermi GBM Final Real-time Localization (GCN 26677) is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 57 degrees.
The GBM light curve shows a complex structure with a duration (T90) of about 41 s (50-300 keV). The time-averaged spectrum from T0-0.8 s to T0+41.2 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.98 +/- 0.08 and the cutoff energy, parameterized as Epeak, is 449 +/- 109 keV.
The event fluence (10-1000 keV) in this time interval is (6.9 +/- 0.6)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0-0.7 s in the 10-1000 keV band is 2.3 +/- 0.2 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 #26690
GRB 200109A: Swift/UVOT Upper Limits
K. K. Simpson (PSU) and A. Melandri (INAF-OAB) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 200109A 110 s after the BAT trigger (Melandri et al., GCN Circ. 26678). No optical afterglow consistent with the XRT position (Melandri et al. GCN Circ. 26678) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC           110          259          147         >20.5
u_FC               268          518          246         >19.0
white              110         1023          295         >20.9
u                  268          518          246         >19.0
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.29 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #26692
H. A. Krimm (NSF), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), A. Melandri (INAF-OAB), D. M. Palmer (LANL), T. Sakamoto (AGU), 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 200109A (trigger #948361) (Melandri et al., GCN Circ. 26678). The BAT ground-calculated position is RA, Dec = 307.116, 52.988 deg which is
```
   RA(J2000)  =  20h 28m 27.7s
   Dec(J2000) = +52d 59' 17.7"
```
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted light curve shows a weak structure with several overlapping pulses that start at ~T-30 s to ~T+20 s, followed by a weaker tail emission that lasts till ~T+100 s. T90 (15-350 keV) is 112.0 +- 32.0 sec (estimated error including systematics).
The time-averaged spectrum from T-31.45 to T+112.55 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.31 +- 0.14. The fluence in the 15-150 keV band is 2.1 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+8.05 sec in the 15-150 keV band is 0.7 +- 0.2 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/948361/BA/
GCN Circular #26710
S. Xiao, Y. F. Du, Y. G. Zheng, C. Cai, Q. Luo, Q. B. Yi, Y. Huang, C. K. Li, G. Li, X. B. Li, J. Y. Liao, S. L. Xiong, C. Z. Liu, X. F. Li, Z. W. Li, Z. Chang, A. M. Zhang, Y. F. Zhang, X. F. Lu, C. L. Zou (IHEP), Y. J. Jin, Z. Zhang (THU), T. P. Li (IHEP/THU), F. J. Lu, L. M. Song, M. Wu, Y. P. Xu, S. N. Zhang (IHEP), report on behalf of the Insight-HXMT team:
At 2020-01-09T01:45:51.89 (T0), Insight-HXMT/HE detected GRB 200109A (trigger ID: HEB200109073) in a routine search of the data, which also triggered Fermi/GBM (GCN #26689), and Swift (GCN #26678).
The Insight-HXMT/HE light curve mainly consists of multiple pulses with a duration (T90) of 36.405 s measured from T0-0.650 s. The 1-ms peak rate, measured from T0+ 9.281 s, is 595 cnts/sec. The total counts from this burst is 6014 counts. URL_LC: http://www.hxmt.org/images/GRB/HEB200109073_lc.jpg
All measurements above are made with the CsI detectors operating in the regular mode with the energy range of about 80-800 keV (deposited energy). Only gamma-rays with energy greater than about 200 keV can penetrate the spacecraft and leave signals in the CsI detectors installed inside of the telescope.
Insight-HXMT is the first Chinese space X-ray telescope, which was funded jointly by the China National Space Administration (CNSA) and the Chinese Academy of Sciences (CAS). More information about it could be found at: http://www.hxmt.org.

Back to JG's homepage

Jochen Greiner, last update: 14-Jan-2020 [Disclaimer]