Gamma-ray Burst 201026A

(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:     Mon 26 Oct 20 22:48:25 UT 
NOTICE_TYPE:     Swift-BAT GRB Position 
TRIGGER_NUM:     1002103,   Seg_Num: 0 
GRB_RA:          196.664d {+13h 06m 39s} (J2000), 
                 196.630d {+13h 06m 31s} (current), 
                 196.772d {+13h 07m 05s} (1950) 
GRB_DEC:         +83.761d {+83d 45' 38"} (J2000), 
                 +83.650d {+83d 38' 58"} (current), 
                 +84.027d {+84d 01' 38"} (1950) 
GRB_ERROR:       3.00 [arcmin radius, statistical only] 
GRB_INTEN:       3764 [cnts]    Image_Peak=136 [image_cnts] 
TRIGGER_DUR:     1.024 [sec]  
TRIGGER_INDEX:   149     E_range: 25-100 keV 
BKG_INTEN:       23928 [cnts] 
BKG_TIME:        81438.12 SOD {22:37:18.12} UT 
BKG_DUR:         8 [sec] 
GRB_DATE:        19148 TJD;   300 DOY;   20/10/26 
GRB_TIME:        81454.18 SOD {22:37:34.18} UT 
GRB_PHI:          21.83 [deg] 
GRB_THETA:        34.25 [deg] 
SOLN_STATUS:     0x20000083 
RATE_SIGNIF:     12.04 [sigma] 
IMAGE_SIGNIF:    6.67 [sigma] 
MERIT_PARAMS:     +1  +0  +0  +0  +2  -4  +0  +0 +11  +0  
SUN_POSTN:       211.74d {+14h 06m 56s}  -12.84d {-12d 50' 39"}
SUN_DIST:         96.71 [deg]   Sun_angle= 1.0 [hr] (West of Sun) 
MOON_POSTN:      346.38d {+23h 05m 32s}  -11.37d {-11d 22' 13"} 
MOON_DIST:       106.83 [deg] 
MOON_ILLUM:      82 [%] 
GAL_COORDS:      122.44, 33.35 [deg] galactic lon,lat of the burst (or transient) 
ECL_COORDS:      105.85, 67.58 [deg] ecliptic lon,lat of the burst (or transient) 
COMMENTS:        SWIFT-BAT GRB Coordinates.   
COMMENTS:        This Notice was delayed by more than 60 sec past the end of the trigger integration interval;   
COMMENTS:        probably due to it occurring during a Malindi downlink session.   
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:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.   
COMMENTS:        This trigger occurred at longitude,latitude = 257.97,20.53 [deg].   
COMMENTS:            
COMMENTS:        NOTE: This BAT event is temporally(1.0<100sec) coincident with the FERMI_GBM event (trignum=625444658).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 26 Oct 20 22:37:57 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     625444658
GRB_RA:          144.767d {+09h 39m 04s} (J2000),
                 145.796d {+09h 43m 11s} (current),
                 142.150d {+09h 28m 36s} (1950)
GRB_DEC:         +85.100d {+85d 05' 60"} (J2000),
                 +85.005d {+85d 00' 17"} (current),
                 +85.324d {+85d 19' 26"} (1950)
GRB_ERROR:       24.33 [deg radius, statistical plus systematic]
GRB_INTEN:       54 [cnts/sec]
DATA_SIGNIF:     4.50 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        19148 TJD;   300 DOY;   20/10/26
GRB_TIME:        81453.06 SOD {22:37:33.06} UT
GRB_PHI:         139.00 [deg]
GRB_THETA:        60.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      1.54
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      61%  Distant Particles
2nd_MOST_LIKELY:  32%  GRB
DETECTORS:       0,0,0, 0,0,0, 0,0,0, 1,0,1, 0,0,
SUN_POSTN:       211.73d {+14h 06m 55s}  -12.84d {-12d 50' 31"}
SUN_DIST:        100.77 [deg]   Sun_angle= 4.4 [hr] (West of Sun)
MOON_POSTN:      346.30d {+23h 05m 12s}  -11.40d {-11d 24' 11"}
MOON_DIST:       106.08 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      127.16, 30.34 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       98.98, 63.45 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201026943/quicklook/glg_lc_medres34_bn201026943.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 153.75,-23.20 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 26 Oct 20 22:38:06 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      58
TRIGGER_NUM:     625444658
GRB_RA:          194.217d {+12h 56m 52s} (J2000),
                 194.375d {+12h 57m 30s} (current),
                 193.835d {+12h 55m 20s} (1950)
GRB_DEC:         +75.267d {+75d 16' 00"} (J2000),
                 +75.154d {+75d 09' 16"} (current),
                 +75.537d {+75d 32' 12"} (1950)
GRB_ERROR:       19.23 [deg radius, statistical plus systematic]
GRB_INTEN:       74 [cnts/sec]
DATA_SIGNIF:     6.60 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        19148 TJD;   300 DOY;   20/10/26
GRB_TIME:        81453.06 SOD {22:37:33.06} UT
GRB_PHI:         131.00 [deg]
GRB_THETA:        50.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      1.51
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      64%  Distant Particles
2nd_MOST_LIKELY:  29%  GRB
DETECTORS:       0,0,0, 0,0,0, 0,0,0, 1,0,1, 0,0,
SUN_POSTN:       211.73d {+14h 06m 55s}  -12.84d {-12d 50' 31"}
SUN_DIST:         88.65 [deg]   Sun_angle= 1.2 [hr] (West of Sun)
MOON_POSTN:      346.30d {+23h 05m 12s}  -11.40d {-11d 24' 10"}
MOON_DIST:       114.38 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      122.47, 41.86 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      126.98, 65.81 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201026943/quicklook/glg_lc_medres34_bn201026943.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 153.75,-23.20 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 26 Oct 20 23:06:18 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     625444658
GRB_RA:          191.390d {+12h 45m 34s} (J2000),
                 191.348d {+12h 45m 24s} (current),
                 191.531d {+12h 46m 07s} (1950)
GRB_DEC:         +85.820d {+85d 49' 12"} (J2000),
                 +85.706d {+85d 42' 23"} (current),
                 +86.093d {+86d 05' 34"} (1950)
GRB_ERROR:       5.47 [deg radius, statistical only]
GRB_DATE:        19148 TJD;   300 DOY;   20/10/26
GRB_TIME:        81453.06 SOD {22:37:33.06} UT
GRB_PHI:         134.79 [deg]
GRB_THETA:        59.97 [deg]
E_RANGE:         50.000 - 300.000 [keV]
LOC_ALGORITHM:   415 (Gnd S/W Version number)
SUN_POSTN:       211.75d {+14h 06m 59s}  -12.85d {-12d 50' 55"}
SUN_DIST:         98.82 [deg]   Sun_angle= 1.4 [hr] (West of Sun)
MOON_POSTN:      346.52d {+23h 06m 05s}  -11.31d {-11d 18' 50"}
MOON_DIST:       105.20 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      123.06, 31.31 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      100.55, 67.04 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201026943/quicklook/glg_lc_medres34_bn201026943.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201026943/quicklook/glg_locplot_all_bn201026943.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(1.0<100sec) coincident with the SWIFT_BAT event (trignum=1002103).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 26 Oct 20 22:49:30 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1002103,   Seg_Num: 0
GRB_RA:          196.664d {+13h 06m 39s} (J2000),
                 196.630d {+13h 06m 31s} (current),
                 196.772d {+13h 07m 05s} (1950)
GRB_DEC:         +83.761d {+83d 45' 38"} (J2000),
                 +83.650d {+83d 38' 58"} (current),
                 +84.027d {+84d 01' 38"} (1950)
GRB_DATE:        19148 TJD;   300 DOY;   20/10/26
GRB_TIME:        81454.18 SOD {22:37:34.18} UT
TRIGGER_INDEX:   149
GRB_PHI:          21.83 [deg]
GRB_THETA:        34.25 [deg]
DELTA_TIME:      -5.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x83
RATE_SIGNIF:     12.04 [sigma]
IMAGE_SIGNIF:    6.67 [sigma]
LC_URL:          sw01002103000msb.lc
SUN_POSTN:       211.74d {+14h 06m 57s}  -12.84d {-12d 50' 40"}
SUN_DIST:         96.71 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      346.39d {+23h 05m 34s}  -11.37d {-11d 22' 00"}
MOON_DIST:       106.83 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      122.44, 33.35 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      105.85, 67.58 [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:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 257.97,20.53 [deg].

GCN NOTICE

 
TITLE:           GCN/SWIFT NOTICE 
NOTICE_DATE:     Mon 26 Oct 20 22:49:07 UT 
NOTICE_TYPE:     Swift-XRT Image 
TRIGGER_NUM:     1002103,   Seg_Num: 0 
GRB_RA:          196.7408d {+13h 06m 57.7s} (J2000), 
                 196.7041d {+13h 06m 48.9s} (current), 
                 196.8550d {+13h 07m 25.2s} (1950) 
GRB_DEC:         +83.7849d {+83d 47' 05.6"} (J2000), 
                 +83.6739d {+83d 40' 26.0"} (current), 
                 +84.0514d {+84d 03' 05.1"} (1950) 
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic] 
GRB_INTEN:       177 [cnts] 
IMG_START_DATE:  19148 TJD;   300 DOY;   20/10/26 
IMG_START_TIME:  81533.02 SOD {22:38:53.02} UT,   78.8 [sec] since BAT Trigger Time 
CENTROID_X:      364.63,  raw= 365  [pixels] 
CENTROID_Y:      321.47,  raw= 321  [pixels]
ROLL:            165.27 [deg] 
GAIN:            2 
MODE:            3, Long Image mode 
WAVEFORM:        134 
EXPO_TIME:       2.50 [sec] 
GRB_POS_XRT_Y:   55.09 
GRB_POS_XRT_Z:   134.91 
IMAGE_URL:       sw01002103000msxps_rw.img 
SUN_POSTN:       211.74d {+14h 06m 57s}  -12.84d {-12d 50' 40"} 
SUN_DIST:         96.73 [deg]   Sun_angle= 1.0 [hr] (West of Sun) 
MOON_POSTN:      346.39d {+23h 05m 33s}  -11.37d {-11d 22' 05"} 
MOON_DIST:       106.81 [deg] 
MOON_ILLUM:      82 [%] 
GAL_COORDS:      122.43, 33.33 [deg] galactic lon,lat of the burst 
ECL_COORDS:      105.78, 67.59 [deg] ecliptic lon,lat of the burst 
COMMENTS:        SWIFT-XRT Image.   
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.   
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:   
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 26 Oct 20 22:49:09 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     1002103,   Seg_Num: 0
GRB_RA:          196.7408d {+13h 06m 57.7s} (J2000),
                 196.7041d {+13h 06m 48.9s} (current),
                 196.8550d {+13h 07m 25.2s} (1950)
GRB_DEC:         +83.7849d {+83d 47' 05.6"} (J2000),
                 +83.6739d {+83d 40' 26.0"} (current),
                 +84.0514d {+84d 03' 05.1"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       177 [cnts]
IMG_START_DATE:  19148 TJD;   300 DOY;   20/10/26
IMG_START_TIME:  81533.02 SOD {22:38:53.02} UT,   78.8 [sec] since BAT Trigger Time
CENTROID_X:      364.63,  raw= 365  [pixels]
CENTROID_Y:      321.47,  raw= 321  [pixels]
ROLL:            165.27 [deg]
GAIN:            2
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   55.09
GRB_POS_XRT_Z:   134.91
IMAGE_URL:       sw01002103000msxps_rw.img
SUN_POSTN:       211.74d {+14h 06m 57s}  -12.84d {-12d 50' 40"}
SUN_DIST:         96.73 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      346.39d {+23h 05m 33s}  -11.37d {-11d 22' 04"}
MOON_DIST:       106.81 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      122.43, 33.33 [deg] galactic lon,lat of the burst
ECL_COORDS:      105.78, 67.59 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 26 Oct 20 22:48:57 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     1002103,   Seg_Num: 0
GRB_RA:          196.7408d {+13h 06m 57.79s} (J2000),
                 196.7041d {+13h 06m 48.97s} (current),
                 196.8550d {+13h 07m 25.20s} (1950)
GRB_DEC:         +83.7849d {+83d 47' 05.6"} (J2000),
                 +83.6739d {+83d 40' 26.0"} (current),
                 +84.0514d {+84d 03' 05.1"} (1950)
GRB_ERROR:       4.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       7.01e-09 [erg/cm2/sec]
GRB_SIGNIF:      13.30 [sigma]
IMG_START_DATE:  19148 TJD;   300 DOY;   20/10/26
IMG_START_TIME:  81533.02 SOD {22:38:53.02} UT,   78.8 [sec] since BAT Trigger Time
TAM[0-3]:        327.64 237.15 261.61 243.51
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       211.74d {+14h 06m 56s}  -12.84d {-12d 50' 40"}
SUN_DIST:         96.73 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      346.39d {+23h 05m 33s}  -11.37d {-11d 22' 07"}
MOON_DIST:       106.81 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      122.43, 33.33 [deg] galactic lon,lat of the burst
ECL_COORDS:      105.78, 67.59 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.54 arcmin from the BAT position.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 24 Oct 20 03:08:47 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1001514,   Seg_Num: 0
POINT_RA:        125.915d {+08h 23m 40s} (J2000)
POINT_DEC:        +3.380d {+03d 22' 48"} (J2000)
ROLL:            102.329d
IMG_START_DATE:  19146 TJD;   298 DOY;   20/10/24
IMG_START_TIME:  11015.17 SOD {03:03:35.17} UT,   876.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     625201441
X_OFFSET:        986 [pixels]
Y_OFFSET:        735 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1146
Y_GRB_POS:       895
BINNING_INDEX:   1
IM_URL:          sw01001514000msuni0902.fits
SUN_POSTN:       209.03d {+13h 56m 08s}  -11.88d {-11d 52' 48"}
SUN_DIST:         83.70 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      311.56d {+20h 46m 15s}  -21.82d {-21d 49' 24"}
MOON_DIST:       160.77 [deg]
MOON_ILLUM:      56 [%]
GAL_COORDS:      220.73, 22.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      127.42,-15.52 [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:     Mon 26 Oct 20 22:49:59 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1002103,   Seg_Num: 0
POINT_RA:        196.693d {+13h 06m 46s} (J2000)
POINT_DEC:       +83.745d {+83d 44' 40"} (J2000)
POINT_ROLL:      165.267d
IMG_START_DATE:  19148 TJD;   300 DOY;   20/10/26
IMG_START_TIME:  81541.99 SOD {22:39:01.99} UT,   87.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.270
N_STARS:         29
X_OFFSET:        368 [pixels]
Y_OFFSET:        616 [pixels]
X_MAX:           1327 [pixels]
Y_MAX:           1575 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw01002103000msufc0087.fits
SUN_POSTN:       211.74d {+14h 06m 57s}  -12.84d {-12d 50' 41"}
SUN_DIST:         96.69 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      346.39d {+23h 05m 35s}  -11.37d {-11d 21' 55"}
MOON_DIST:       106.84 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      122.43, 33.37 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      105.89, 67.59 [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:     Mon 26 Oct 20 22:49:43 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1002103,   Seg_Num: 0
POINT_RA:        196.693d {+13h 06m 46s} (J2000)
POINT_DEC:       +83.745d {+83d 44' 40"} (J2000)
POINT_ROLL:      165.267d
IMG_START_DATE:  19148 TJD;   300 DOY;   20/10/26
IMG_START_TIME:  81541.99 SOD {22:39:01.99} UT,   87.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.270
N_STARS:         29
X_OFFSET:        368 [pixels]
Y_OFFSET:        616 [pixels]
X_MAX:           1327 [pixels]
Y_MAX:           1575 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw01002103000msufc0087.fits
SUN_POSTN:       211.74d {+14h 06m 57s}  -12.84d {-12d 50' 41"}
SUN_DIST:         96.69 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      346.39d {+23h 05m 34s}  -11.37d {-11d 21' 58"}
MOON_DIST:       106.84 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      122.43, 33.37 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      105.89, 67.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 24 Oct 20 03:08:55 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1001514,   Seg_Num: 0
POINT_RA:        125.915d {+08h 23m 40s} (J2000)
POINT_DEC:        +3.380d {+03d 22' 48"} (J2000)
ROLL:            102.329d
IMG_START_DATE:  19146 TJD;   298 DOY;   20/10/24
IMG_START_TIME:  11015.17 SOD {03:03:35.17} UT,   876.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     625201441
X_OFFSET:        986 [pixels]
Y_OFFSET:        735 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1146
Y_GRB_POS:       895
BINNING_INDEX:   1
IM_URL:          sw01001514000msuni0902.fits
SUN_POSTN:       209.03d {+13h 56m 08s}  -11.88d {-11d 52' 48"}
SUN_DIST:         83.70 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      311.56d {+20h 46m 15s}  -21.82d {-21d 49' 23"}
MOON_DIST:       160.77 [deg]
MOON_ILLUM:      56 [%]
GAL_COORDS:      220.73, 22.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      127.42,-15.52 [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:     Mon 26 Oct 20 22:52:12 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1002103,   Seg_Num: 0
POINT_RA:        196.693d {+13h 06m 46s} (J2000)
POINT_DEC:       +83.745d {+83d 44' 40"} (J2000)
ROLL:            165.267d
IMG_START_DATE:  19148 TJD;   300 DOY;   20/10/26
IMG_START_TIME:  81541.99 SOD {22:39:01.99} UT,   87.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     625444767
X_OFFSET:        507 [pixels]
Y_OFFSET:        922 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       667
Y_GRB_POS:       1082
BINNING_INDEX:   1
IM_URL:          sw01002103000msuni0113.fits
SUN_POSTN:       211.74d {+14h 06m 57s}  -12.85d {-12d 50' 43"}
SUN_DIST:         96.69 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      346.41d {+23h 05m 39s}  -11.36d {-11d 21' 30"}
MOON_DIST:       106.84 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      122.43, 33.37 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      105.89, 67.59 [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:     Mon 26 Oct 20 22:56:11 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1002103,   Seg_Num: 0
POINT_RA:        196.711d {+13h 06m 51s} (J2000)
POINT_DEC:       +83.744d {+83d 44' 40"} (J2000)
POINT_ROLL:      165.285d
IMG_START_DATE:  19148 TJD;   300 DOY;   20/10/26
IMG_START_TIME:  81754.61 SOD {22:42:34.61} UT,   300.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.456
N_STARS:         33
X_OFFSET:        187 [pixels]
Y_OFFSET:        602 [pixels]
X_MAX:           1146 [pixels]
Y_MAX:           1561 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    3
SL_URL:          sw01002103000msufc0300.fits
SUN_POSTN:       211.74d {+14h 06m 58s}  -12.85d {-12d 50' 46"}
SUN_DIST:         96.69 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      346.44d {+23h 05m 46s}  -11.35d {-11d 20' 44"}
MOON_DIST:       106.83 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      122.43, 33.37 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      105.89, 67.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 26 Oct 20 22:56:25 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1002103,   Seg_Num: 0
POINT_RA:        196.711d {+13h 06m 51s} (J2000)
POINT_DEC:       +83.744d {+83d 44' 40"} (J2000)
POINT_ROLL:      165.285d
IMG_START_DATE:  19148 TJD;   300 DOY;   20/10/26
IMG_START_TIME:  81754.61 SOD {22:42:34.61} UT,   300.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.456
N_STARS:         33
X_OFFSET:        187 [pixels]
Y_OFFSET:        602 [pixels]
X_MAX:           1146 [pixels]
Y_MAX:           1561 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    3
SL_URL:          sw01002103000msufc0300.fits
SUN_POSTN:       211.74d {+14h 06m 58s}  -12.85d {-12d 50' 46"}
SUN_DIST:         96.69 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      346.44d {+23h 05m 47s}  -11.35d {-11d 20' 42"}
MOON_DIST:       106.82 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      122.43, 33.37 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      105.89, 67.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #28783
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-IAC robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Spain (IAC Teide Observatory) was pointed to the Swift GRB201026.94 (trigger No 1002103,13h 06m 39.36s , +83d 45m 39.6s, R=0.05) errorbox 665 sec after trigger time at 2020-10-26 22:48:39 UT, with upper limit up to 16.9 mag. The observations began at zenith distance = 68 deg. The sun altitude is -58.5 deg.
The galactic latitude b = 34 deg., longitude l = 122 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1469722
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

     731 |          MASTER-IAC |   C |   130 | 16.9 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #28784
S. B. Cenko (GSFC), S. D. Barthelmy (GSFC), M. G. Bernardini (INAF-OAB), P. D'Avanzo (INAF-OAB), J.D. Gropp (PSU), J. A. Kennea (PSU), N. J. Klingler (PSU), S. Laha (GSFC/UMBC/CRESST), F. E. Marshall (NASA/GSFC), A. Melandri (INAF-OAB), M. J. Moss (GWU), D. M. Palmer (LANL) and T. Sbarrato (INAF-OAB) report on behalf of the Neil Gehrels Swift Observatory Team:
At 22:37:34 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 201026A (trigger=1002103). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 196.664, +83.761 which is
```
   RA(J2000) = 13h 06m 39s
   Dec(J2000) = +83d 45' 38"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex peak structure with a duration of about 30 sec. The peak count rate was ~1700counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 22:38:53.0 UT, 78.8 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 196.7408, 83.7849 which is equivalent to:
```
   RA(J2000)  = 13h 06m 57.79s
   Dec(J2000) = +83d 47' 05.6"
```
with an uncertainty of 4.8 arcseconds (radius, 90% containment). This location is 91 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy.
The initial flux in the 2.5 s image was 7.01e-09 erg cm^-2 s^-1 (0.2-10 keV).
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 0.18.
Burst Advocate for this burst is S. B. Cenko (brad.cenko AT nasa.gov). 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:     Mon 26 Oct 20 23:00:05 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1002103,   Seg_Num: 0
POINT_RA:        196.710d {+13h 06m 50s} (J2000)
POINT_DEC:       +83.745d {+83d 44' 41"} (J2000)
POINT_ROLL:      165.283d
IMG_START_DATE:  19148 TJD;   300 DOY;   20/10/26
IMG_START_TIME:  82333.43 SOD {22:52:13.43} UT,   879.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        0.262
N_STARS:         92
X_OFFSET:        0 [pixels]
Y_OFFSET:        362 [pixels]
X_MAX:           1439 [pixels]
Y_MAX:           1801 [pixels]
DET_THRESH:      5
PHOTO_THRESH:    2
SL_URL:          sw01002103000msufc0879.fits
SUN_POSTN:       211.74d {+14h 06m 58s}  -12.85d {-12d 50' 49"}
SUN_DIST:         96.70 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      346.47d {+23h 05m 54s}  -11.33d {-11d 20' 00"}
MOON_DIST:       106.81 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      122.43, 33.37 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      105.89, 67.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_srclist.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 26 Oct 20 23:01:10 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1002103,   Seg_Num: 0
POINT_RA:        196.710d {+13h 06m 50s} (J2000)
POINT_DEC:       +83.745d {+83d 44' 41"} (J2000)
ROLL:            165.283d
IMG_START_DATE:  19148 TJD;   300 DOY;   20/10/26
IMG_START_TIME:  82333.43 SOD {22:52:13.43} UT,   879.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     625445559
X_OFFSET:        559 [pixels]
Y_OFFSET:        921 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       719
Y_GRB_POS:       1081
BINNING_INDEX:   1
IM_URL:          sw01002103000msuni0905.fits
SUN_POSTN:       211.74d {+14h 06m 58s}  -12.85d {-12d 50' 50"}
SUN_DIST:         96.70 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      346.48d {+23h 05m 56s}  -11.33d {-11d 19' 48"}
MOON_DIST:       106.81 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      122.43, 33.37 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      105.89, 67.59 [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:     Mon 26 Oct 20 23:10:40 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     1002103,   Seg_Num: 0
GRB_RA:          196.7375d {+13h 06m 57.00s} (J2000),
                 196.7009d {+13h 06m 48.22s} (current),
                 196.8513d {+13h 07m 24.32s} (1950)
GRB_DEC:         +83.7831d {+83d 46' 59.1"} (J2000),
                 +83.6721d {+83d 40' 19.5"} (current),
                 +84.0496d {+84d 02' 58.7"} (1950)
GRB_ERROR:       3.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  19148 TJD;   300 DOY;   20/10/26
IMG_START_TIME:  81888.00 SOD {22:44:48.00} UT,   433.8 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       211.75d {+14h 07m 00s}  -12.85d {-12d 50' 58"}
SUN_DIST:         96.73 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      346.56d {+23h 06m 14s}  -11.30d {-11d 18' 00"}
MOON_DIST:       106.75 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      122.43, 33.33 [deg] galactic lon,lat of the burst
ECL_COORDS:      105.79, 67.59 [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:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 1.1% < P(seren) < 2.8%.

GCN Circular #28785
L. Izzo (DARK/NBI), D. B. Malesani (DTU Space), T. Kuutma (NOT), report on behalf od a larger collaboration:
We observed the optical afterglow of GRB 201026A (Cenko et al., GCN 28784) using the Nordic Optical Telescope (NOT) equipped with the ALFOSC imaging camera. A set of 2x300 s and 5x200 s images was secured in the SDSS r and z bands, respectively. The mid time of the observation was Oct 26.968 (36.2 min after the GRB). Observations were conducted at high airmass under moderate seeing conditions (1.4").
No new object is detected consistent with the XRT position, down to a limiting magnitude r= 21.5, z = 21.4 AB (3 sigma), calibrated against nearby stars from the Pan-STARRS catalog.
We note the presence of a faint, possibly extended object visible in the archival Pan-STARRS images, at a position consistent (RA = 13:06:58.71, Dec = +83:46:58.5) with that of the X-ray afterglow. This object could be the host galaxy of GRB 201026A, but we caution that the currently available uncertainty radius of the XRT position is still relatively large (3.9"), hence the association not robust.
GCN Circular #28786
Z.P. Zhu (NAOC, HUST), S.Y. Fu, X. Liu, D. Xu (NAOC), X. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report:
We observed the field of GRB 201026A (Cenko et al., GCN 28784) using the NEXT-0.6m optical telescope located at Nanshan, Xinjiang, China. Observations automatically started at 22:49:35 UT on 2020-10-26, i.e., 12 min after the BAT trigger. We obtained 3x40 s, 4x60 s and 12x90 s frames in the Sloan r-filter.
No new optical source is detected in our stacked image at the XRT position, down to a limiting magnitude of r = 20.5, calibrated with the nearby Pan-STARRS field.
GCN Circular #28790
Martin Jelinek and Jan Strobl (ASU CAS Ondrejov, CZ), Sergey Karpov, Martin Masek, Petr Janecek, Jakub Jurysek, Jan Ebr, Ronan Cunniffe, Petr Travnicek and Michael Prouza (Institute of Physics, Prague, CZ)
report:
The 25cm robotic telescope FRAM-ORM at La Palma (Spain) reacted robotically to the alert of GRB201026A (Cenko et al GCNC 28784), obtaining a series of 20 s unfiltered images starting at 22:50:58.9 UT, i.e. 13.4 min post trigger.
We do not detect any new source within or near the XRT errorbox neither in single images (3-sigma limit R>~17.1, (Vega), calibrated by the Atlas catalog) nor in a combined 15x20s frame (mean exp time 21.15 min post trigger, 3-sigma limit R>~18.5) similarly to Lipunov et al. (GCNC 28783), Izzo et al. (GCNC 28785) and Zhu et al. (GCNC 28786)
GCN Circular #28791
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 466 s of XRT Photon Counting mode data and 1 UVOT images for GRB 201026A, 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 = 196.74662, +83.78196 which is equivalent to:
```
RA (J2000): 13h 06m 59.19s
Dec (J2000): +83d 46' 55.0"
```
with an uncertainty of 1.9 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 #28793
A. A. Breeveld (UCL-MSSL) and S. B. Cenko (GSFC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 201026A 88 s after the BAT trigger (Cenko et al., GCN Circ. 28784). No optical afterglow consistent with the XRT position (Goad et al., GCN Circ. 28791) 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         >20.6
white               88          904          210         >20.9
u_FC               300          550          246         >20.1
v                  630          823           39         >18.3
b                  563          749           32         >19.2
u                  300          724          265         >20.2
w1                 680          873           39         >18.5
w2                4139         4518          197         >19.3
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.18 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #28796
P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), E. Ambrosi (INAF-IASFPA) , M. Capalbi (INAF-IASFPA), M. Perri (ASDC), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), B. Sbarufatti (PSU), K.L. Page (U. Leicester) and S.B. Cenko report on behalf of the Swift-XRT team:
We have analysed 3.2 ks of XRT data for GRB 201026A (Cenko et al. GCN Circ. 28784), from 85 s to 46.3 ks after the BAT trigger. The data comprise 361 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 28791).
The light curve can be modelled with a power-law decay with a decay index of alpha=0.90 (+1.12, -0.13).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.82 (+/-0.03). The best-fitting absorption column is 4.84 (+0.22, -0.21) x 10^21 cm^-2, in excess of the Galactic value of 1.1 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 4.4 x 10^-11 (6.4 x 10^-11) erg cm^-2 count^-1.
A summary of the WT-mode spectrum is thus:
```
Total column:	     4.84 (+0.22, -0.21) x 10^21 cm^-2
Galactic foreground: 1.1 x 10^21 cm^-2
Excess significance: 29.0 sigma
Photon index:	     1.82 (+/-0.03)
```
If the light curve continues to decay with a power-law decay index of 0.90, the count rate at T+24 hours will be 5.6 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.5 x 10^-13 (3.6 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01002103.
This circular is an official product of the Swift-XRT team.
GCN Circular #28797
R. Hamburg (UAH) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 22:37:33.06 UT on 26 October 2020, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 201026A (trigger 625444658 / 201026943), which was initially misclassified as a distant particle event by the GBM flight software. GRB 201026A was also detected by the Swift/BAT and the Swift/XRT (Cenko et al. 2020, GCN 28784). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 58 degrees.
The GBM light curve shows a main pulse with a duration (T90) of about 35 s (50-300 keV). There is also later emission extending to approximately T0+280 s. We cannot conclusively confirm it is related to the main emission episode with GBM data alone; however, similar late-time emission can be seen in the Swift-XRT lightcurve (Evans et al. 2020, GCN 28796).
The time-averaged spectrum of the main pulse from T0-16 s to T0+23 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.83 +/- 0.10 and the cutoff energy, parameterized as Epeak, is 68 +/- 3 keV. A Band function fits the spectrum equally well with Epeak = 63 +/- 5 keV, alpha = -0.73 +/- 0.14 and beta = -2.84 +/- 0.34.
The event fluence (10-1000 keV) in this time interval is (3.96 +/- 0.14)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+1.47 s in the 10-1000 keV band is 3.04 +/- 0.22 ph/s/cm^2.
For the later emission episode, the time-averaged spectrum from T0+188 s to T0+237 s is best fit by a simple power law function with index -1.84 +/- 0.04. The event fluence (10-1000 keV) in this time interval is (4.51 +/- 0.29)E-06 erg/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 #28800
GRB 201026A: Swift-BAT refined analysis
S. D. Barthelmy (GSFC), S. B. Cenko (GSFC) J. R. Cummings (CPI), 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-60 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 201026A (trigger #1002103) (S. B. Cenko et al., GCN Circ. 28784). The BAT ground-calculated position is RA, Dec = 196.696, 83.807 deg which is
```
   RA(J2000)  =  13h 06m 47.0s
   Dec(J2000) = +83d 48' 24.3"
```
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 46%.
The BAT light curve showed a complex structure. There are two prominent peaks, at ~ T+0 sec and T+210 sec with a duration of about 50 sec and 60 sec respectively. There is a small peak at T+140 to T+170 sec, and possibly a precursor at T-60 to T-40 sec. T90 (15-350 keV) is 135.38 +- 120.84 sec (estimated error including systematics).
The time-averaged spectrum from T-13 to T+146 sec and T+165 to T+230 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.94 +- 0.09. The fluence in the 15-150 keV band is 5.6 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+1.05 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/1002103/BA/

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Jochen Greiner, last update: 29-Oct-2020 [Disclaimer]