Gamma-ray Burst 201006A

(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:     Tue 06 Oct 20 01:18:17 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     998907,   Seg_Num: 0
GRB_RA:           61.880d {+04h 07m 31s} (J2000),
                  62.367d {+04h 09m 28s} (current),
                  60.714d {+04h 02m 51s} (1950)
GRB_DEC:         +65.150d {+65d 08' 59"} (J2000),
                 +65.204d {+65d 12' 14"} (current),
                 +65.016d {+65d 00' 58"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       1589 [cnts]    Image_Peak=109 [image_cnts]
TRIGGER_DUR:     0.512 [sec] 
TRIGGER_INDEX:   40     E_range: 25-100 keV
BKG_INTEN:       16659 [cnts]
BKG_TIME:        4662.24 SOD {01:17:42.24} UT
BKG_DUR:         8 [sec]
GRB_DATE:        19128 TJD;   280 DOY;   20/10/06
GRB_TIME:        4672.03 SOD {01:17:52.03} UT
GRB_PHI:          85.33 [deg]
GRB_THETA:        31.35 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     20.19 [sigma]
IMAGE_SIGNIF:    8.04 [sigma]
MERIT_PARAMS:     +1  +0  +0  -1  +2  -2  +0  +1 +35  +0 
SUN_POSTN:       192.20d {+12h 48m 47s}   -5.23d {-05d 13' 55"}
SUN_DIST:        110.51 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:       56.97d {+03h 47m 53s}  +17.93d {+17d 56' 03"}
MOON_DIST:        47.41 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      141.71,  9.70 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       74.22, 43.24 [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 = 11.43,19.88 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(0.0<100sec) coincident with the FERMI_GBM event (trignum=623639877).

red DSS finding chart ps-file

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Tue 06 Oct 20 01:18:09 UT
NOTICE_TYPE:    INTEGRAL Weak
TRIGGER_NUM:    8745,   Sub_Num: 0
GRB_RA:          61.8075d {+04h 07m 14s} (J2000),
                 62.2945d {+04h 09m 11s} (current),
                 60.6410d {+04h 02m 34s} (1950)
GRB_DEC:        +65.1768d {+65d 10' 37"} (J2000),
                +65.2310d {+65d 13' 52"} (current),
                +65.0428d {+65d 02' 34"} (1950)
GRB_ERROR:      3.80 [arcmin, radius, statistical only]
GRB_INTEN:      6.03 [sigma]   
GRB_TIME:       4680.15 SOD {01:18:00.15} UT
GRB_DATE:       19128 TJD;   280 DOY;   20/10/06
SC_RA:           73.02 [deg] (J2000)
SC_DEC:          55.77 [deg] (J2000)
SUN_POSTN:      192.20d {+12h 48m 47s}   -5.23d {-05d 13' 55"}
SUN_DIST:       110.51 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:      56.97d {+03h 47m 52s}  +17.93d {+17d 56' 02"}
MOON_DIST:       47.43 [deg]   
GAL_COORDS:     141.67,  9.70 [deg] galactic lon,lat of the burst
ECL_COORDS:      74.19, 43.28 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates -- this is the weak/subthreshold trigger notice.
COMMENTS:       This notice may or may not be followed by a Wakeup/Refined/Offline notice.
COMMENTS:       Time_Scale=0.3199 and Time_Error=8.0000.
COMMENTS:       Possibly real GRB event (WEAK detection)
COMMENTS:
COMMENTS:       NOTE: This INTEGRAL event is temporally(8.0<100sec) coincident with the FERMI_GBM event (trignum=623639877).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 06 Oct 20 01:18:20 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     623639877
GRB_RA:           52.517d {+03h 30m 04s} (J2000),
                  52.931d {+03h 31m 44s} (current),
                  51.523d {+03h 26m 06s} (1950)
GRB_DEC:         +58.233d {+58d 13' 60"} (J2000),
                 +58.303d {+58d 18' 12"} (current),
                 +58.062d {+58d 03' 43"} (1950)
GRB_ERROR:       24.80 [deg radius, statistical plus systematic]
GRB_INTEN:       188 [cnts/sec]
DATA_SIGNIF:     6.30 [sigma]
INTEG_TIME:      0.512 [sec]
GRB_DATE:        19128 TJD;   280 DOY;   20/10/06
GRB_TIME:        4672.27 SOD {01:17:52.27} UT
GRB_PHI:         209.00 [deg]
GRB_THETA:        50.00 [deg]
DATA_TIME_SCALE: 0.5120 [sec]
HARD_RATIO:      1.44
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   1%  Generic SGR
DETECTORS:       0,0,0, 0,0,0, 0,1,1, 0,0,0, 0,0,
SUN_POSTN:       192.20d {+12h 48m 47s}   -5.23d {-05d 13' 55"}
SUN_DIST:        118.30 [deg]   Sun_angle= 9.3 [hr] (West of Sun)
MOON_POSTN:       56.97d {+03h 47m 53s}  +17.93d {+17d 56' 03"}
MOON_DIST:        40.48 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      142.57,  1.54 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       66.06, 37.87 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201006054/quicklook/glg_lc_medres34_bn201006054.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 143.82,24.08 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=998907).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 06 Oct 20 01:59:54 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     623639877
GRB_RA:           37.270d {+02h 29m 05s} (J2000),
                  37.606d {+02h 30m 25s} (current),
                  36.465d {+02h 25m 52s} (1950)
GRB_DEC:         +44.740d {+44d 44' 24"} (J2000),
                 +44.832d {+44d 49' 54"} (current),
                 +44.517d {+44d 31' 02"} (1950)
GRB_ERROR:       17.55 [deg radius, statistical only]
GRB_DATE:        19128 TJD;   280 DOY;   20/10/06
GRB_TIME:        4672.27 SOD {01:17:52.27} UT
GRB_PHI:         201.00 [deg]
GRB_THETA:        65.00 [deg]
E_RANGE:         50.000 - 300.000 [keV]
LOC_ALGORITHM:   415 (Gnd S/W Version number)
SUN_POSTN:       192.22d {+12h 48m 54s}   -5.24d {-05d 14' 35"}
SUN_DIST:        134.63 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:       57.31d {+03h 49m 15s}  +18.04d {+18d 02' 07"}
MOON_DIST:        31.45 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      140.60,-14.76 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       50.04, 28.34 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201006054/quicklook/glg_lc_medres34_bn201006054.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201006054/quicklook/glg_locplot_all_bn201006054.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 has human-in-the-loop processing.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=998907).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 06 Oct 20 01:19:23 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     998907,   Seg_Num: 0
POINT_RA:         61.914d {+04h 07m 39s} (J2000)
POINT_DEC:       +65.166d {+65d 09' 59"} (J2000)
IMG_START_DATE:  19128 TJD;   280 DOY;   20/10/06
IMG_START_TIME:  4755.97 SOD {01:19:15.97} UT,   83.9 [sec] since BAT Trigger Time
COUNTS:          2    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        1    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Oct 20 10:11:17 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     998344,   Seg_Num: 0
POINT_RA:        110.100d {+07h 20m 24s} (J2000)
POINT_DEC:        -2.214d {-02d 12' 48"} (J2000)
POINT_ROLL:      93.055d
IMG_START_DATE:  19123 TJD;   275 DOY;   20/10/01
IMG_START_TIME:  36209.84 SOD {10:03:29.84} UT,   278.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.075
N_STARS:         190
X_OFFSET:        42 [pixels]
Y_OFFSET:        406 [pixels]
X_MAX:           1481 [pixels]
Y_MAX:           1845 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00998344000msufc0278.fits
SUN_POSTN:       187.99d {+12h 31m 58s}   -3.45d {-03d 26' 50"}
SUN_DIST:         77.52 [deg]   Sun_angle= 5.2 [hr] (West of Sun)
MOON_POSTN:        5.35d {+00h 21m 24s}   -3.02d {-03d 01' 22"}
MOON_DIST:       104.85 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      218.22,  5.42 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      112.10,-24.12 [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:     Tue 06 Oct 20 01:22:13 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     998907,   Seg_Num: 0
POINT_RA:         61.914d {+04h 07m 39s} (J2000)
POINT_DEC:       +65.166d {+65d 09' 58"} (J2000)
POINT_ROLL:      54.304d
IMG_START_DATE:  19128 TJD;   280 DOY;   20/10/06
IMG_START_TIME:  4759.84 SOD {01:19:19.84} UT,   87.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.966
N_STARS:         32
X_OFFSET:        345 [pixels]
Y_OFFSET:        678 [pixels]
X_MAX:           1304 [pixels]
Y_MAX:           1637 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00998907000msufc0087.fits
SUN_POSTN:       192.20d {+12h 48m 48s}   -5.23d {-05d 14' 00"}
SUN_DIST:        110.49 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:       57.00d {+03h 48m 00s}  +17.94d {+17d 56' 37"}
MOON_DIST:        47.41 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      141.71,  9.72 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       74.25, 43.26 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 06 Oct 20 01:21:25 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     998907,   Seg_Num: 0
GRB_RA:           61.880d {+04h 07m 31s} (J2000),
                  62.367d {+04h 09m 28s} (current),
                  60.714d {+04h 02m 51s} (1950)
GRB_DEC:         +65.150d {+65d 08' 59"} (J2000),
                 +65.204d {+65d 12' 14"} (current),
                 +65.016d {+65d 00' 58"} (1950)
GRB_DATE:        19128 TJD;   280 DOY;   20/10/06
GRB_TIME:        4672.03 SOD {01:17:52.03} UT
TRIGGER_INDEX:   40
GRB_PHI:          85.33 [deg]
GRB_THETA:        31.35 [deg]
DELTA_TIME:      -18.00 [sec]
TRIGGER_DUR:     0.512 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     20.19 [sigma]
IMAGE_SIGNIF:    8.04 [sigma]
LC_URL:          sw00998907000msb.lc
SUN_POSTN:       192.20d {+12h 48m 48s}   -5.23d {-05d 13' 58"}
SUN_DIST:        110.51 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:       57.00d {+03h 47m 59s}  +17.94d {+17d 56' 30"}
MOON_DIST:        47.40 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      141.71,  9.70 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       74.22, 43.24 [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 = 11.43,19.88 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 06 Oct 20 01:23:36 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     998907,   Seg_Num: 0
POINT_RA:         61.914d {+04h 07m 39s} (J2000)
POINT_DEC:       +65.166d {+65d 09' 58"} (J2000)
ROLL:            54.304d
IMG_START_DATE:  19128 TJD;   280 DOY;   20/10/06
IMG_START_TIME:  4759.84 SOD {01:19:19.84} UT,   87.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     623639985
X_OFFSET:        664 [pixels]
Y_OFFSET:        997 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       824
Y_GRB_POS:       1157
BINNING_INDEX:   1
IM_URL:          sw00998907000msuni0113.fits
SUN_POSTN:       192.20d {+12h 48m 48s}   -5.23d {-05d 14' 01"}
SUN_DIST:        110.49 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:       57.01d {+03h 48m 03s}  +17.95d {+17d 56' 49"}
MOON_DIST:        47.41 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      141.71,  9.72 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       74.25, 43.26 [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 01 Oct 20 10:06:15 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     998344,   Seg_Num: 0
POINT_RA:        110.097d {+07h 20m 23s} (J2000)
POINT_DEC:        -2.214d {-02d 12' 48"} (J2000)
ROLL:            93.057d
IMG_START_DATE:  19123 TJD;   275 DOY;   20/10/01
IMG_START_TIME:  36051.18 SOD {10:00:51.18} UT,   119.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     623239276
X_OFFSET:        601 [pixels]
Y_OFFSET:        965 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       761
Y_GRB_POS:       1125
BINNING_INDEX:   1
IM_URL:          sw00998344000msuni0145.fits
SUN_POSTN:       187.99d {+12h 31m 57s}   -3.45d {-03d 26' 45"}
SUN_DIST:         77.52 [deg]   Sun_angle= 5.2 [hr] (West of Sun)
MOON_POSTN:        5.31d {+00h 21m 15s}   -3.04d {-03d 02' 24"}
MOON_DIST:       104.89 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      218.22,  5.42 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      112.10,-24.12 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 06 Oct 20 01:23:40 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     998907,   Seg_Num: 0
GRB_RA:           61.8909d {+04h 07m 33.81s} (J2000),
                  62.3780d {+04h 09m 30.72s} (current),
                  60.7243d {+04h 02m 53.83s} (1950)
GRB_DEC:         +65.1650d {+65d 09' 54.0"} (J2000),
                 +65.2190d {+65d 13' 08.5"} (current),
                 +65.0313d {+65d 01' 52.7"} (1950)
GRB_ERROR:       4.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  19128 TJD;   280 DOY;   20/10/06
IMG_START_TIME:  4768.00 SOD {01:19:28.00} UT,   96.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       192.20d {+12h 48m 48s}   -5.23d {-05d 14' 01"}
SUN_DIST:        110.50 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:       57.01d {+03h 48m 03s}  +17.95d {+17d 56' 50"}
MOON_DIST:        47.41 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      141.70,  9.71 [deg] galactic lon,lat of the burst
ECL_COORDS:       74.23, 43.26 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
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:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Oct 20 10:16:44 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     998344,   Seg_Num: 0
POINT_RA:        110.100d {+07h 20m 24s} (J2000)
POINT_DEC:        -2.214d {-02d 12' 48"} (J2000)
POINT_ROLL:      93.055d
IMG_START_DATE:  19123 TJD;   275 DOY;   20/10/01
IMG_START_TIME:  36788.87 SOD {10:13:08.87} UT,   857.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.757
N_STARS:         190
X_OFFSET:        42 [pixels]
Y_OFFSET:        406 [pixels]
X_MAX:           1481 [pixels]
Y_MAX:           1845 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00998344000msufc0857.fits
SUN_POSTN:       187.99d {+12h 31m 58s}   -3.45d {-03d 26' 55"}
SUN_DIST:         77.53 [deg]   Sun_angle= 5.2 [hr] (West of Sun)
MOON_POSTN:        5.39d {+00h 21m 34s}   -3.00d {-03d 00' 14"}
MOON_DIST:       104.81 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      218.22,  5.42 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      112.10,-24.12 [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 01 Oct 20 10:12:27 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     998344,   Seg_Num: 0
POINT_RA:        110.100d {+07h 20m 24s} (J2000)
POINT_DEC:        -2.214d {-02d 12' 48"} (J2000)
ROLL:            93.055d
IMG_START_DATE:  19123 TJD;   275 DOY;   20/10/01
IMG_START_TIME:  36209.84 SOD {10:03:29.84} UT,   278.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     623239435
X_OFFSET:        601 [pixels]
Y_OFFSET:        965 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       761
Y_GRB_POS:       1125
BINNING_INDEX:   1
IM_URL:          sw00998344000msuni0304.fits
SUN_POSTN:       187.99d {+12h 31m 58s}   -3.45d {-03d 26' 51"}
SUN_DIST:         77.52 [deg]   Sun_angle= 5.2 [hr] (West of Sun)
MOON_POSTN:        5.36d {+00h 21m 26s}   -3.02d {-03d 01' 08"}
MOON_DIST:       104.85 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      218.22,  5.42 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      112.10,-24.12 [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:     Tue 06 Oct 20 01:29:36 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     998907,   Seg_Num: 0
POINT_RA:         61.919d {+04h 07m 41s} (J2000)
POINT_DEC:       +65.169d {+65d 10' 08"} (J2000)
POINT_ROLL:      54.309d
IMG_START_DATE:  19128 TJD;   280 DOY;   20/10/06
IMG_START_TIME:  4971.70 SOD {01:22:51.70} UT,   299.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.539
N_STARS:         27
X_OFFSET:        105 [pixels]
Y_OFFSET:        438 [pixels]
X_MAX:           1544 [pixels]
Y_MAX:           1877 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00998907000msufc0299.fits
SUN_POSTN:       192.20d {+12h 48m 49s}   -5.24d {-05d 14' 06"}
SUN_DIST:        110.49 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:       57.06d {+03h 48m 15s}  +17.96d {+17d 57' 42"}
MOON_DIST:        47.40 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      141.71,  9.73 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       74.25, 43.26 [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:     Tue 06 Oct 20 01:29:46 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     998907,   Seg_Num: 0
GRB_RA:           61.8932d {+04h 07m 34.36s} (J2000),
                  62.3803d {+04h 09m 31.27s} (current),
                  60.7266d {+04h 02m 54.38s} (1950)
GRB_DEC:         +65.1650d {+65d 09' 54.0"} (J2000),
                 +65.2190d {+65d 13' 08.4"} (current),
                 +65.0313d {+65d 01' 52.8"} (1950)
GRB_ERROR:       2.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  19128 TJD;   280 DOY;   20/10/06
IMG_START_TIME:  4768.00 SOD {01:19:28.00} UT,   96.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       192.20d {+12h 48m 49s}   -5.24d {-05d 14' 06"}
SUN_DIST:        110.50 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:       57.06d {+03h 48m 15s}  +17.96d {+17d 57' 43"}
MOON_DIST:        47.39 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      141.70,  9.71 [deg] galactic lon,lat of the burst
ECL_COORDS:       74.23, 43.26 [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 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 06 Aug 20 15:45:16 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     987016,   Seg_Num: 0
POINT_RA:         52.903d {+03h 31m 37s} (J2000)
POINT_DEC:       +37.071d {+37d 04' 15"} (J2000)
POINT_ROLL:      80.071d
IMG_START_DATE:  19067 TJD;   219 DOY;   20/08/06
IMG_START_TIME:  55816.15 SOD {15:30:16.15} UT,   86.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.993
N_STARS:         77
X_OFFSET:        480 [pixels]
Y_OFFSET:        488 [pixels]
X_MAX:           1439 [pixels]
Y_MAX:           1447 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    9
SL_URL:          sw00987016000msufc0086.fits
SUN_POSTN:       137.10d {+09h 08m 24s}  +16.44d {+16d 26' 28"}
SUN_DIST:         75.37 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      352.09d {+23h 28m 21s}   -8.91d {-08d 54' 50"}
MOON_DIST:        73.35 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:      155.14,-15.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       59.70, 17.45 [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 06 Aug 20 15:53:39 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     987016,   Seg_Num: 0
POINT_RA:          0.000d {+00h 00m 00s} (J2000)
POINT_DEC:        +0.000d {+00d 00' 00"} (J2000)
ROLL:            37.074d
IMG_START_DATE:  19067 TJD;   219 DOY;   20/08/06
IMG_START_TIME:  56749.86 SOD {15:45:49.86} UT,   1019.9 [sec] since BAT Trigger Time
FILTER:          0, illegal value
EXPOSURE_ID:     65537
X_OFFSET:        911 [pixels]
Y_OFFSET:        1280 [pixels]
WIDTH:           800 [pixels]
HEIGHT:          1821 [pixels]
X_GRB_POS:       0
Y_GRB_POS:       0
BINNING_INDEX:   0
IM_URL:          sw00987016000msuni0325.fits
SUN_POSTN:       137.10d {+09h 08m 25s}  +16.44d {+16d 26' 22"}
SUN_DIST:        134.35 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      352.15d {+23h 28m 37s}   -8.89d {-08d 53' 12"}
MOON_DIST:        12.09 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:       96.34,-60.19 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        0.00,  0.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        WARNING: This Notice was received with 1 (or more) critical values out of range.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 1x1 binning (ie no compression).  
COMMENTS:        This notice was forced out after watchdog timer expiring -- most likely due to missing packet(s);  
COMMENTS:        as a consequence some of the fields may be incoorect (eg TRIGGER_NUM,RA,DEC).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 06 Aug 20 15:55:33 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     987016,   Seg_Num: 0
POINT_RA:         52.901d {+03h 31m 36s} (J2000)
POINT_DEC:       +37.074d {+37d 04' 26"} (J2000)
ROLL:            80.069d
IMG_START_DATE:  19067 TJD;   219 DOY;   20/08/06
IMG_START_TIME:  56605.99 SOD {15:43:25.99} UT,   876.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     618421431
X_OFFSET:        938 [pixels]
Y_OFFSET:        778 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1098
Y_GRB_POS:       938
BINNING_INDEX:   1
IM_URL:          sw00987016000msuni0902.fits
SUN_POSTN:       137.11d {+09h 08m 25s}  +16.44d {+16d 26' 21"}
SUN_DIST:         75.37 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      352.17d {+23h 28m 41s}   -8.88d {-08d 52' 49"}
MOON_DIST:        73.27 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:      155.13,-15.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       59.70, 17.46 [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:     Tue 06 Oct 20 01:35:55 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     998907,   Seg_Num: 0
POINT_RA:         61.919d {+04h 07m 41s} (J2000)
POINT_DEC:       +65.169d {+65d 10' 08"} (J2000)
POINT_ROLL:      54.308d
IMG_START_DATE:  19128 TJD;   280 DOY;   20/10/06
IMG_START_TIME:  5548.19 SOD {01:32:28.19} UT,   876.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.482
N_STARS:         132
X_OFFSET:        105 [pixels]
Y_OFFSET:        438 [pixels]
X_MAX:           1544 [pixels]
Y_MAX:           1877 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00998907000msufc0876.fits
SUN_POSTN:       192.21d {+12h 48m 50s}   -5.24d {-05d 14' 12"}
SUN_DIST:        110.49 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:       57.12d {+03h 48m 28s}  +17.98d {+17d 58' 37"}
MOON_DIST:        47.38 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      141.71,  9.73 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       74.25, 43.26 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #28559
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 GRB201006.05 (trigger No 998907,04h 07m 31.20s , +65d 09m 00.0s, R=0.05) errorbox 66 sec after trigger time at 2020-10-06 01:18:58 UT, with upper limit up to 18.0 mag. The observations began at zenith distance = 22 deg. The sun altitude is -26.9 deg.
The galactic latitude b = 10 deg., longitude l = 142 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1455690
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

      71 |      MASTER-Tavrida |   C |    10 | 17.1 |        
     107 |      MASTER-Tavrida |   C |    20 | 17.5 |        
     152 |      MASTER-Tavrida |   C |    30 | 17.8 |        
     207 |      MASTER-Tavrida |   C |    40 | 18.0 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #28560
J.D. Gropp (PSU), S. D. Barthelmy (GSFC), S. Laha (GSFC/UMBC/CRESST), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), B. Sbarufatti (PSU), M. H. Siegel (PSU) and A. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift Observatory Team:
At 01:17:52 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 201006A (trigger=998907). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 61.880, +65.150 which is
```
   RA(J2000)  =  04h 07m 31s
   Dec(J2000) = +65d 08' 59"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single spike structure with a duration of about 5 sec. The peak count rate was ~2500 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 01:19:15.9 UT, 83.9 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 61.8932, 65.1650 which is equivalent to:
```
   RA(J2000)  = 04h 07m 34.36s
   Dec(J2000) = +65d 09' 54.0"
```
with an uncertainty of 2.6 arcseconds (radius, 90% containment). This location is 57 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. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 4.50 x 10^21 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 87 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. The typical 3-sigma upper limit has been about 19.6 mag. 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 1.27.
Burst Advocate for this burst is J.D. Gropp (jdg44 AT 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:     Tue 06 Oct 20 01:37:15 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     998907,   Seg_Num: 0
POINT_RA:         61.919d {+04h 07m 41s} (J2000)
POINT_DEC:       +65.169d {+65d 10' 08"} (J2000)
ROLL:            54.308d
IMG_START_DATE:  19128 TJD;   280 DOY;   20/10/06
IMG_START_TIME:  5548.19 SOD {01:32:28.19} UT,   876.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     623640773
X_OFFSET:        664 [pixels]
Y_OFFSET:        997 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       824
Y_GRB_POS:       1157
BINNING_INDEX:   1
IM_URL:          sw00998907000msuni0902.fits
SUN_POSTN:       192.21d {+12h 48m 50s}   -5.24d {-05d 14' 14"}
SUN_DIST:        110.49 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:       57.13d {+03h 48m 30s}  +17.98d {+17d 58' 49"}
MOON_DIST:        47.37 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      141.71,  9.73 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       74.25, 43.26 [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 #28561
S.Mereghetti (INAF, IASF-Milano), D.Gotz (CEA, Saclay), C.Ferrigno, E.Bozzo, V.Savchenko (ISDC, Versoix), L.Ducci (IAAT, Germany and ISDC, Versoix) and J.Borkowski (CAMK, Torun) report:
GRB 201006A detected by Swift (Gropp et al., GCN 28560) has been also revealed as a sub-threshold GRB by IBAS in the IBIS/ISGRI data. The corresponding WEAK type Alert Packet with the burst position was distributed in real time (Alert n. 8745).
The burst coordinates (J2000) obtained with the offline analysis of the IBIS/ISGRI data are:
```
R.A.= 61.9045 deg
DEC.= +65.1478  deg
```
with an uncertainty of 3 arcmin (90% c.l.).
GCN Circular #28562
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 1436 s of XRT Photon Counting mode data and 2 UVOT images for GRB 201006A, 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 = 61.89270, +65.16462 which is equivalent to:
```
RA (J2000): 04h 07m 34.25s
Dec (J2000): +65d 09' 52.6"
```
with an uncertainty of 2.1 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 #28563
```
TITLE:   GCN CIRCULAR
NUMBER:  28563 
SUBJECT: GRB 201006A is likely a short burst
DATE:    20/10/06 17:04:58 GMT 
FROM:    Aaron Tohuvavohu at U Toronto  
```
GRB 201006A, detected by Swift/BAT (Gropp et al. GCN 28560), INTEGRAL/IBAS (Mereghetti et al. GCN 28561) and Fermi/GBM (trig num 623639877), appears likely to be a short burst, despite the real-time duration estimate (~5s) reported in GCN 28560. The T90 estimate from downlinked Swift/BAT event data is less than 0.5 seconds. Follow-up is encouraged.
GCN Circular #28564
R. Hamburg (UAH) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 01:17:52.27 UT on 06 October 2020, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 201006A (trigger 623639877 / 201006054), which was also detected by the Swift/BAT and the Swift/XRT (Gropp et al. 2020, GCN 28560). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 42 degrees.
The GBM light curve consists of one main spike with a duration (T90) of about 1.7 s (50-300 keV). The time-averaged spectrum from T0-0.19 s to T0+0.83 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.97 +/- 0.19 and the cutoff energy, parameterized as Epeak, is 130 +/- 26 keV.
The event fluence (10-1000 keV) in this time interval is (3.33 +/- 0.38)E-07 erg/cm^2. The 64-ms peak photon flux measured starting from T0-0.064 s in the 10-1000 keV band is 6.86 +/- 0.97 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 #28565
F. E. Marshall (NASA/GSFC) and J. D. Gropp (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 201006A 88 s after the BAT trigger (Gropp et al., GCN Circ. 28560). No optical afterglow consistent with the XRT position (Goad et al. GCN Circ. 28562) 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 88 238 147 >21.1
u_FC 300 549 246 >20.2
white 88 1539 385 >21.0
v 629 1423 97 >18.9
b 555 1521 97 >19.8
u 300 722 265 >20.3
w1 678 1472 97 >18.7
w2 1205 1225 19 >17.3
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 1.27 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #28567
S. D. Barthelmy (GSFC), J. R. Cummings (CPI), J. D. Gropp (PSU), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), 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-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 201006A (trigger #998907) (Group et al., GCN Circ. 28560). The BAT ground-calculated position is RA, Dec = 61.917, 65.148 deg which is
```
   RA(J2000)  =  04h 07m 40.1s
   Dec(J2000) = +65d 08' 53.3"
```
with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 33%.
The mask-weighted light curve shows a pulse that starts and peaks at ~T0, and ends at ~T+0.5 s. T90 (15-350 keV) is 0.49 +- 0.09 sec (estimated error including systematics).
The time-averaged spectrum from T-0.01 to T+0.54 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.42 +- 0.24. The fluence in the 15-150 keV band is 1.3 +- 0.2 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-0.23 sec in the 15-150 keV band is 2.2 +- 0.3 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/998907/BA/
GCN Circular #28568
J. D. Gropp (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), P. D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) , J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto) and J.D. Gropp report on behalf of the Swift-XRT team:
We have analysed 6.0 ks of XRT data for GRB 201006A (Gropp et al. GCN Circ. 28560), from 91 s to 70.3 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 28562).
The light curve can be modelled with a power-law decay with a decay index of alpha=0.99 (+0.14, -0.13).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.1 (+/-0.6). The best-fitting absorption column is 1.3 (+0.7, -0.5) x 10^22 cm^-2, in excess of the Galactic value of 4.5 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 4.9 x 10^-11 (1.1 x 10^-10) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.3 (+0.7, -0.5) x 10^22 cm^-2
Galactic foreground: 4.5 x 10^21 cm^-2
Excess significance: 2.5 sigma
Photon index:	     2.1 (+/-0.6)
```
If the light curve continues to decay with a power-law decay index of 0.99, the count rate at T+24 hours will be 4.0 x 10^-4 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.0 x 10^-14 (4.3 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/00998907.
This circular is an official product of the Swift-XRT team.
GCN Circular #28571
N. Ito, R. Hosokawa, K. L. Murata, R. Adachi, M. Niwano, F. Ogawa, N. Nakamura, S. Ogata, H. Takamatsu, H. Hara, Y. Yatsu, and N. Kawai (TokyoTech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 201006A (J.D. Gropp et al.,GCN #28560, S.Mereghetti et al., GCN #28561, R. Hamburg et al., GCN # 28564) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan. The observation started at 13:31:53 UT. Since some images were heavily affected by bad weather and the moon, we stacked the images with good conditions. We did not find any new point sources within the enhanced Swift/XRT circle (M.R. Goad et al., GCN #28562) in all three bands. We obtained the 5-sigma limits as follows.
```
T0+[hour] MID-UT T-EXP[sec] 5-sigma limits
------------------------------------------------------------------------------------------------
12.2 16:27:01 4020.0 g'>19.5,Rc>19.4,Ic>18.9
------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
```
We used PS1 catalog for flux calibration. The magnitudes are expressed in the AB system. The images were processed in real-time through the MITSuME GPU reduction pipeline (Niwano et al., accepted for publication in PASJ; arXiv2008.11486 https://github.com/MNiwano/Eclaire)
GCN Circular #28572
S.Dichiara (UMD, NASA-GSFC), S.B. Cenko (NASA-GSFC), E. Troja (UMD, NASA-GSFC), P. Gatkine (UMD), J.M. Durbak (UMD), A. Kutyrev (UMD, NASA-GSFC), S. Veilleux (UMD), report on behalf of a larger collaboration:
We observed the field of the short GRB 201006A (Gropp et al., GCN Circ. 28560) using the Large Monolithic Imager (LMI) on the 4.3m Lowell Discovery Telescope (LDT) at Happy Jack, AZ. Observations started on October 7, 11:50:54 UT (1.44 days after the Swift trigger) taking 3 exposures of 150 s each with SDSS i filter. Observations were taken at an airmass of about 1.19 and seeing of about 0.5". We do not find any source inside the enhanced XRT position (Goad et al., GCN Circ. 28562) down to a 3-sigma limiting magnitude of i>23.8 AB mag. Magnitudes are calibrated against the PanSTARRS catalog and not corrected for Galactic extinction.
We thank the staff of the Lowell Discovery Telescope for assistance with these observations.
GCN Circular #28573
H. Kumar (IITB), J. Stanzin (IAO), V. Bhalerao(IITB), G. C. Anupama(IIA), S. Barway(IIA), report on behalf of the GROWTH-India collaboration:
We observed GRB 201006A reported by Swift-BAT (J.D. Gropp et al., GCN 28560; also see: S.Mereghetti et al., GCN 28561; M.R. Goad et al., GCN 28562; Aaron Tohuvavohu GCN 28563; R. Hamburg and C. Meegan, GCN 28564; F. E. Marshall and J. D. Gropp GCN 28565; S. D. Barthelmy et al., GCN 28567; J. D. Gropp et al., GCN 28568; N. Ito et al., 28571, S.Dichiara et al., GCN 28572) with 0.7m GROWTH-India Telescope (GIT). The field was observed in the SDSS r’ filter starting at 2020-10-06T18:32:40.4 UT i.e. ~17.25 hrs after the event detection by Swift-BAT. We obtained 20 exposures of 300 sec each. The field was close to the moon (~43 deg) during observations. We did not find any source in the stacked image within the uncertainty region of 2.1 arcsec around the Swift-XRT position of RA(J2000): 04h 07m 34.25s, Dec(J2000): +65d 09' 52.6" (GCN 28562). We obtained an upper limit of r > 20.09 mag, calibrated against PanSTARRs PS1 data release (Flewelling et al., 2018).
The GROWTH India Telescope (GIT) is a 70-cm telescope with a 0.7-degree field of view, set up by the Indian Institute of Astrophysics and the Indian Institute of Technology Bombay with support from the Indo-US Science and Technology Forum (IUSSTF) and the Science and Engineering Research Board (SERB) of the Department of Science and Technology (DST), Government of India (https://sites.google.com/view/growthindia/). It is located at the Indian Astronomical Observatory (Hanle), operated by the Indian Institute of Astrophysics (IIA).
GCN Circular #28598
A. Rouco Escorial, W. Fong, G. Schroeder, K. Paterson, C. D. Kilpatrick, A. Nugent, J. Rastinejad, R. Margutti, K. D. Alexander (Northwestern), T. Laskar (Bath), and E. Berger (Harvard) report:
�We initiated observations with the Chandra X-ray Observatory of the short-duration GRB 201006A (Barthelmy et al., GCN 28560; Tohuvavohu, GCN 28563; Hamburg et al., GCN 28564; Lien et al., GCN 28567) starting on 2020 October 09 20:57:42 UT, with a median observation time of 3.98 days post-trigger. We obtained one ACIS-S observation under the Proposal 21400447 (ObsID 22401; PI: Fong), with an effective exposure time of 24.7 ks.
We do not detect an X-ray source within the enhanced Swift-XRT position (90% confidence; Evans et al., GCN 28562). Centered on the XRT position, we obtain a 3-sigma limit of <3.6e-4 cts/s in the 0.5-8 keV energy range (following Gehrels 1986). Applying the best-fit PC-mode XRT spectral parameters (Gamma=2.1, total NH=1.3e22 cm^-2; Evans et al., GCN 28568), we calculate a 3-sigma unabsorbed flux limit of FX<1.15e-14 erg/s/cm^2 in the 0.3-10 keV energy range.
The XRT afterglow, starting at ~153.3 s post-burst, can be modeled with a power law decline (where FX~t^alpha) with a decay index of alpha=-0.99(+0.14,-0.13) consistent with the results of Evans et al. (GCN 28568). Our Chandra upper limit is marginally consistent with the expected flux at dt~3.98 days drawn by this model.
We thank the Chandra Director, Patrick Slane, and staff for the rapid planning and scheduling of these observations.

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Jochen Greiner, last update: 11-Oct-2020 [Disclaimer]