Gamma-ray Burst 191004A

(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:     Fri 04 Oct 19 18:07:18 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     927825,   Seg_Num: 0
GRB_RA:           31.721d {+02h 06m 53s} (J2000),
                  31.931d {+02h 07m 43s} (current),
                  31.190d {+02h 04m 46s} (1950)
GRB_DEC:         -36.932d {-36d 55' 53"} (J2000),
                 -36.838d {-36d 50' 16"} (current),
                 -37.169d {-37d 10' 08"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       537 [cnts]    Image_Peak=71 [image_cnts]
TRIGGER_DUR:     0.064 [sec] 
TRIGGER_INDEX:   10419     E_range: 25-100 keV
BKG_INTEN:       19446 [cnts]
BKG_TIME:        65208.30 SOD {18:06:48.30} UT
BKG_DUR:         8 [sec]
GRB_DATE:        18760 TJD;   277 DOY;   19/10/04
GRB_TIME:        65222.70 SOD {18:07:02.70} UT
GRB_PHI:         117.79 [deg]
GRB_THETA:        35.98 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     32.83 [sigma]
IMAGE_SIGNIF:    9.12 [sigma]
MERIT_PARAMS:     +1  +0  +0  -4  +2  +0  +0  +0 +69  +0 
SUN_POSTN:       190.32d {+12h 41m 18s}   -4.44d {-04d 26' 29"}
SUN_DIST:        134.06 [deg]   Sun_angle= 10.6 [hr] (West of Sun)
MOON_POSTN:      270.38d {+18h 01m 32s}  -22.24d {-22d 14' 27"}
MOON_DIST:        99.24 [deg]
MOON_ILLUM:      41 [%]
GAL_COORDS:      249.23,-71.30 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       12.17,-45.93 [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 = 105.13,3.12 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Fri 04 Oct 19 18:07:54 UT
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    8383,   Sub_Num: 0
GRB_INTEN:      9.23 [sigma]   
GRB_TIME:       65224.91 SOD {18:07:04.91} UT
GRB_DATE:       18760 TJD;   277 DOY;   19/10/04
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.
COMMENTS:       Time_Scale=0.8000 and Time_Error=0.4000. 
COMMENTS:
COMMENTS:       NOTE: This SPIACS event is temporally(2.0<100sec) coincident with the SWIFT_BAT event (trignum=927825).
COMMENTS:
COMMENTS:       The SPIACS lightcurve can be found at:
COMMENTS:       ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2019-10/2019-10-04T18-07-04.7132-02120-27536-0.lc

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 04 Oct 19 18:08:31 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     927825,   Seg_Num: 0
POINT_RA:         31.695d {+02h 06m 47s} (J2000)
POINT_DEC:       -36.946d {-36d 56' 46"} (J2000)
IMG_START_DATE:  18760 TJD;   277 DOY;   19/10/04
IMG_START_TIME:  65304.23 SOD {18:08:24.23} UT,   81.5 [sec] since BAT Trigger Time
COUNTS:          14    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        2    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:     Fri 04 Oct 19 18:10:33 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     927825,   Seg_Num: 0
GRB_RA:           31.721d {+02h 06m 53s} (J2000),
                  31.931d {+02h 07m 43s} (current),
                  31.190d {+02h 04m 46s} (1950)
GRB_DEC:         -36.932d {-36d 55' 53"} (J2000),
                 -36.838d {-36d 50' 16"} (current),
                 -37.169d {-37d 10' 08"} (1950)
GRB_DATE:        18760 TJD;   277 DOY;   19/10/04
GRB_TIME:        65222.86 SOD {18:07:02.86} UT
TRIGGER_INDEX:   10419
GRB_PHI:         117.79 [deg]
GRB_THETA:        35.98 [deg]
DELTA_TIME:      -14.00 [sec]
TRIGGER_DUR:     0.064 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     32.83 [sigma]
IMAGE_SIGNIF:    9.12 [sigma]
LC_URL:          sw00927825000msb.lc
SUN_POSTN:       190.33d {+12h 41m 18s}   -4.44d {-04d 26' 32"}
SUN_DIST:        134.06 [deg]   Sun_angle= 10.6 [hr] (West of Sun)
MOON_POSTN:      270.42d {+18h 01m 40s}  -22.24d {-22d 14' 35"}
MOON_DIST:        99.22 [deg]
MOON_ILLUM:      41 [%]
GAL_COORDS:      249.23,-71.30 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       12.17,-45.93 [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 = 105.13,3.12 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 04 Oct 19 18:11:22 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     927825,   Seg_Num: 0
POINT_RA:         31.694d {+02h 06m 47s} (J2000)
POINT_DEC:       -36.946d {-36d 56' 46"} (J2000)
POINT_ROLL:      149.545d
IMG_START_DATE:  18760 TJD;   277 DOY;   19/10/04
IMG_START_TIME:  65307.56 SOD {18:08:27.56} UT,   84.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.531
N_STARS:         21
X_OFFSET:        351 [pixels]
Y_OFFSET:        393 [pixels]
X_MAX:           1310 [pixels]
Y_MAX:           1352 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00927825000msufc0084.fits
SUN_POSTN:       190.33d {+12h 41m 18s}   -4.44d {-04d 26' 33"}
SUN_DIST:        134.06 [deg]   Sun_angle= 10.6 [hr] (West of Sun)
MOON_POSTN:      270.42d {+18h 01m 42s}  -22.24d {-22d 14' 38"}
MOON_DIST:        99.19 [deg]
MOON_ILLUM:      41 [%]
GAL_COORDS:      249.30,-71.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       12.13,-45.93 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 04 Oct 19 18:11:43 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     927825,   Seg_Num: 0
POINT_RA:         31.694d {+02h 06m 47s} (J2000)
POINT_DEC:       -36.946d {-36d 56' 46"} (J2000)
POINT_ROLL:      149.545d
IMG_START_DATE:  18760 TJD;   277 DOY;   19/10/04
IMG_START_TIME:  65307.56 SOD {18:08:27.56} UT,   84.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.531
N_STARS:         21
X_OFFSET:        351 [pixels]
Y_OFFSET:        393 [pixels]
X_MAX:           1310 [pixels]
Y_MAX:           1352 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00927825000msufc0084.fits
SUN_POSTN:       190.33d {+12h 41m 18s}   -4.44d {-04d 26' 33"}
SUN_DIST:        134.06 [deg]   Sun_angle= 10.6 [hr] (West of Sun)
MOON_POSTN:      270.43d {+18h 01m 42s}  -22.24d {-22d 14' 39"}
MOON_DIST:        99.19 [deg]
MOON_ILLUM:      41 [%]
GAL_COORDS:      249.30,-71.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       12.13,-45.93 [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:     Fri 04 Oct 19 18:12:53 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     927825,   Seg_Num: 0
POINT_RA:         31.694d {+02h 06m 47s} (J2000)
POINT_DEC:       -36.946d {-36d 56' 46"} (J2000)
ROLL:            149.545d
IMG_START_DATE:  18760 TJD;   277 DOY;   19/10/04
IMG_START_TIME:  65307.56 SOD {18:08:27.56} UT,   84.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     591905331
X_OFFSET:        670 [pixels]
Y_OFFSET:        712 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       830
Y_GRB_POS:       872
BINNING_INDEX:   1
IM_URL:          sw00927825000msuni0108.fits
SUN_POSTN:       190.33d {+12h 41m 19s}   -4.44d {-04d 26' 34"}
SUN_DIST:        134.06 [deg]   Sun_angle= 10.6 [hr] (West of Sun)
MOON_POSTN:      270.44d {+18h 01m 45s}  -22.25d {-22d 14' 42"}
MOON_DIST:        99.18 [deg]
MOON_ILLUM:      41 [%]
GAL_COORDS:      249.30,-71.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       12.13,-45.93 [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:     Fri 04 Oct 19 18:12:57 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     927825,   Seg_Num: 0
POINT_RA:         31.694d {+02h 06m 47s} (J2000)
POINT_DEC:       -36.946d {-36d 56' 46"} (J2000)
ROLL:            149.545d
IMG_START_DATE:  18760 TJD;   277 DOY;   19/10/04
IMG_START_TIME:  65307.56 SOD {18:08:27.56} UT,   84.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     591905331
X_OFFSET:        670 [pixels]
Y_OFFSET:        712 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       830
Y_GRB_POS:       872
BINNING_INDEX:   1
IM_URL:          sw00927825000msuni0108.fits
SUN_POSTN:       190.33d {+12h 41m 19s}   -4.44d {-04d 26' 34"}
SUN_DIST:        134.06 [deg]   Sun_angle= 10.6 [hr] (West of Sun)
MOON_POSTN:      270.44d {+18h 01m 45s}  -22.25d {-22d 14' 42"}
MOON_DIST:        99.18 [deg]
MOON_ILLUM:      41 [%]
GAL_COORDS:      249.30,-71.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       12.13,-45.93 [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:     Fri 04 Oct 19 18:13:16 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     927825,   Seg_Num: 0
GRB_RA:           31.6700d {+02h 06m 40.80s} (J2000),
                  31.8797d {+02h 07m 31.12s} (current),
                  31.1390d {+02h 04m 33.36s} (1950)
GRB_DEC:         -36.9341d {-36d 56' 02.7"} (J2000),
                 -36.8406d {-36d 50' 26.1"} (current),
                 -37.1717d {-37d 10' 18.1"} (1950)
GRB_ERROR:       4.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18760 TJD;   277 DOY;   19/10/04
IMG_START_TIME:  65399.00 SOD {18:09:59.00} UT,   176.3 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       190.33d {+12h 41m 19s}   -4.44d {-04d 26' 35"}
SUN_DIST:        134.08 [deg]   Sun_angle= 10.6 [hr] (West of Sun)
MOON_POSTN:      270.44d {+18h 01m 46s}  -22.25d {-22d 14' 43"}
MOON_DIST:        99.17 [deg]
MOON_ILLUM:      41 [%]
GAL_COORDS:      249.30,-71.33 [deg] galactic lon,lat of the burst
ECL_COORDS:       12.11,-45.91 [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 0.11% < P(seren) < 0.58%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 04 Oct 19 18:20:07 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     927825,   Seg_Num: 0
POINT_RA:         31.694d {+02h 06m 47s} (J2000)
POINT_DEC:       -36.949d {-36d 56' 57"} (J2000)
POINT_ROLL:      149.546d
IMG_START_DATE:  18760 TJD;   277 DOY;   19/10/04
IMG_START_TIME:  65519.62 SOD {18:11:59.62} UT,   296.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.439
N_STARS:         22
X_OFFSET:        111 [pixels]
Y_OFFSET:        153 [pixels]
X_MAX:           1550 [pixels]
Y_MAX:           1592 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    3
SL_URL:          sw00927825000msufc0296.fits
SUN_POSTN:       190.33d {+12h 41m 20s}   -4.45d {-04d 26' 41"}
SUN_DIST:        134.06 [deg]   Sun_angle= 10.6 [hr] (West of Sun)
MOON_POSTN:      270.51d {+18h 02m 02s}  -22.25d {-22d 15' 01"}
MOON_DIST:        99.13 [deg]
MOON_ILLUM:      41 [%]
GAL_COORDS:      249.31,-71.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       12.13,-45.93 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 04 Oct 19 18:20:21 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     927825,   Seg_Num: 0
POINT_RA:         31.694d {+02h 06m 47s} (J2000)
POINT_DEC:       -36.949d {-36d 56' 57"} (J2000)
POINT_ROLL:      149.546d
IMG_START_DATE:  18760 TJD;   277 DOY;   19/10/04
IMG_START_TIME:  65519.62 SOD {18:11:59.62} UT,   296.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.439
N_STARS:         22
X_OFFSET:        111 [pixels]
Y_OFFSET:        153 [pixels]
X_MAX:           1550 [pixels]
Y_MAX:           1592 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    3
SL_URL:          sw00927825000msufc0296.fits
SUN_POSTN:       190.33d {+12h 41m 20s}   -4.45d {-04d 26' 41"}
SUN_DIST:        134.06 [deg]   Sun_angle= 10.6 [hr] (West of Sun)
MOON_POSTN:      270.51d {+18h 02m 02s}  -22.25d {-22d 15' 02"}
MOON_DIST:        99.13 [deg]
MOON_ILLUM:      41 [%]
GAL_COORDS:      249.31,-71.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       12.13,-45.93 [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:     Fri 04 Oct 19 18:21:17 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     927825,   Seg_Num: 0
POINT_RA:         31.694d {+02h 06m 47s} (J2000)
POINT_DEC:       -36.949d {-36d 56' 57"} (J2000)
ROLL:            149.546d
IMG_START_DATE:  18760 TJD;   277 DOY;   19/10/04
IMG_START_TIME:  65519.62 SOD {18:11:59.62} UT,   296.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     591905543
X_OFFSET:        670 [pixels]
Y_OFFSET:        712 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       830
Y_GRB_POS:       872
BINNING_INDEX:   1
IM_URL:          sw00927825000msuni0320.fits
SUN_POSTN:       190.33d {+12h 41m 20s}   -4.45d {-04d 26' 42"}
SUN_DIST:        134.06 [deg]   Sun_angle= 10.6 [hr] (West of Sun)
MOON_POSTN:      270.52d {+18h 02m 05s}  -22.25d {-22d 15' 04"}
MOON_DIST:        99.12 [deg]
MOON_ILLUM:      41 [%]
GAL_COORDS:      249.31,-71.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       12.13,-45.93 [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:     Fri 04 Oct 19 18:21:27 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     927825,   Seg_Num: 0
POINT_RA:         31.694d {+02h 06m 47s} (J2000)
POINT_DEC:       -36.949d {-36d 56' 57"} (J2000)
ROLL:            149.546d
IMG_START_DATE:  18760 TJD;   277 DOY;   19/10/04
IMG_START_TIME:  65519.62 SOD {18:11:59.62} UT,   296.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     591905543
X_OFFSET:        670 [pixels]
Y_OFFSET:        712 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       830
Y_GRB_POS:       872
BINNING_INDEX:   1
IM_URL:          sw00927825000msuni0320.fits
SUN_POSTN:       190.33d {+12h 41m 20s}   -4.45d {-04d 26' 43"}
SUN_DIST:        134.06 [deg]   Sun_angle= 10.6 [hr] (West of Sun)
MOON_POSTN:      270.52d {+18h 02m 05s}  -22.25d {-22d 15' 05"}
MOON_DIST:        99.12 [deg]
MOON_ILLUM:      41 [%]
GAL_COORDS:      249.31,-71.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       12.13,-45.93 [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 Circular #25944
V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, F. Balakin Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University D. Buckley, S. Potter, A. Kniazev, M. Kotze South African Astronomical Observatory K. Ivanov, O. Gres, N.M. Budnev, S. Yazev, O. Chuvalaev, V. Poleshchuk Irkutsk State University
A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory
V. Yurkov, A. Gabovich, Yu. Sergienko Blagoveschensk Educational State University, Blagoveschensk
R. Podesta, Carlos Lopez and F. Podesta Observatorio Astronomico Felix Aguilar (OAFA)
Hugo Levato Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias
MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) was pointed to the GRB191004.75 25 sec after notice time and 43 sec after trigger time at 2019-10-04 18:07:45 UT. On our first (10s exposure) set we found 1 optical transient within Swift error-box (ra=31.7208 dec=-36.9319 r=0.05) brighter than 23.
```
  T-Tmid      Date      Time       Expt.        Ra                Dec 
Mag
---------|---------------------|-------|-----------------|-----------------|-------
       48   2019-10-04 18:07:45      10   (02h 06m 40.526s , -36d 56m 
00.41s)    15.11
```
The 5-sigma upper limit has been about 23mag The message may be cited.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 04 Oct 19 18:27:34 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     927825,   Seg_Num: 0
POINT_RA:         31.694d {+02h 06m 46s} (J2000)
POINT_DEC:       -36.950d {-36d 56' 57"} (J2000)
POINT_ROLL:      149.546d
IMG_START_DATE:  18760 TJD;   277 DOY;   19/10/04
IMG_START_TIME:  66096.97 SOD {18:21:36.97} UT,   874.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.576
N_STARS:         48
X_OFFSET:        111 [pixels]
Y_OFFSET:        153 [pixels]
X_MAX:           1550 [pixels]
Y_MAX:           1592 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00927825000msufc0874.fits
SUN_POSTN:       190.34d {+12h 41m 21s}   -4.45d {-04d 26' 48"}
SUN_DIST:        134.06 [deg]   Sun_angle= 10.6 [hr] (West of Sun)
MOON_POSTN:      270.58d {+18h 02m 19s}  -22.26d {-22d 15' 21"}
MOON_DIST:        99.08 [deg]
MOON_ILLUM:      41 [%]
GAL_COORDS:      249.31,-71.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       12.13,-45.93 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 04 Oct 19 18:27:47 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     927825,   Seg_Num: 0
POINT_RA:         31.694d {+02h 06m 46s} (J2000)
POINT_DEC:       -36.950d {-36d 56' 57"} (J2000)
POINT_ROLL:      149.546d
IMG_START_DATE:  18760 TJD;   277 DOY;   19/10/04
IMG_START_TIME:  66096.97 SOD {18:21:36.97} UT,   874.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.576
N_STARS:         48
X_OFFSET:        111 [pixels]
Y_OFFSET:        153 [pixels]
X_MAX:           1550 [pixels]
Y_MAX:           1592 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00927825000msufc0874.fits
SUN_POSTN:       190.34d {+12h 41m 21s}   -4.45d {-04d 26' 49"}
SUN_DIST:        134.06 [deg]   Sun_angle= 10.6 [hr] (West of Sun)
MOON_POSTN:      270.58d {+18h 02m 20s}  -22.26d {-22d 15' 21"}
MOON_DIST:        99.08 [deg]
MOON_ILLUM:      41 [%]
GAL_COORDS:      249.31,-71.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       12.13,-45.93 [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:     Fri 04 Oct 19 18:29:40 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     927825,   Seg_Num: 0
POINT_RA:         31.694d {+02h 06m 46s} (J2000)
POINT_DEC:       -36.950d {-36d 56' 57"} (J2000)
ROLL:            149.546d
IMG_START_DATE:  18760 TJD;   277 DOY;   19/10/04
IMG_START_TIME:  66096.97 SOD {18:21:36.97} UT,   874.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     591906120
X_OFFSET:        670 [pixels]
Y_OFFSET:        712 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       830
Y_GRB_POS:       872
BINNING_INDEX:   1
IM_URL:          sw00927825000msuni0898.fits
SUN_POSTN:       190.34d {+12h 41m 21s}   -4.45d {-04d 26' 50"}
SUN_DIST:        134.06 [deg]   Sun_angle= 10.6 [hr] (West of Sun)
MOON_POSTN:      270.60d {+18h 02m 24s}  -22.26d {-22d 15' 26"}
MOON_DIST:        99.07 [deg]
MOON_ILLUM:      41 [%]
GAL_COORDS:      249.31,-71.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       12.13,-45.93 [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:     Fri 04 Oct 19 18:29:53 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     927825,   Seg_Num: 0
POINT_RA:         31.694d {+02h 06m 46s} (J2000)
POINT_DEC:       -36.950d {-36d 56' 57"} (J2000)
ROLL:            149.546d
IMG_START_DATE:  18760 TJD;   277 DOY;   19/10/04
IMG_START_TIME:  66096.97 SOD {18:21:36.97} UT,   874.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     591906120
X_OFFSET:        670 [pixels]
Y_OFFSET:        712 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       830
Y_GRB_POS:       872
BINNING_INDEX:   1
IM_URL:          sw00927825000msuni0898.fits
SUN_POSTN:       190.34d {+12h 41m 21s}   -4.45d {-04d 26' 51"}
SUN_DIST:        134.06 [deg]   Sun_angle= 10.6 [hr] (West of Sun)
MOON_POSTN:      270.60d {+18h 02m 25s}  -22.26d {-22d 15' 27"}
MOON_DIST:        99.06 [deg]
MOON_ILLUM:      41 [%]
GAL_COORDS:      249.31,-71.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       12.13,-45.93 [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 #25945
S. B. Cenko (GSFC), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), A. D'Ai (INAF-IASFPA), V. D'Elia (SSDC), J.D. Gropp (PSU), N. J. Klingler (PSU), S Laha (CRESST/GSFC/UMD), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), M. J. Moss (GWU), K. L. Page (U Leicester), B. Sbarufatti (PSU) and A. Tohuvavohu (Toronto) report on behalf of the Neil Gehrels Swift Observatory Team:
At 18:07:02 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 191004A (trigger=927825). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 31.721, -36.932 which is
```
   RA(J2000)  =  02h 06m 53s
   Dec(J2000) = -36d 55' 53"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a double-peaked structure with a duration of about 5 sec. The peak count rate was ~8000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 18:08:24.2 UT, 81.5 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 31.66950, -36.93368 which is equivalent to:
```
   RA(J2000)  = 02h 06m 40.68s
   Dec(J2000) = -36d 56' 01.2"
```
with an uncertainty of 3.6 arcseconds (radius, 90% containment). This location is 148 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 http://www.swift.ac.uk/sper. No spectrum from the promptly downlinked event data is yet available to determine the column density.
UVOT took a finding chart exposure of 150 seconds with the White filter starting 84 seconds after the BAT trigger. Results from the list of sources generated on-board shows an optical source consistent with the XRT position. Because there was not automatic aspect solution for the image, the precise position and magnitude will be reported later. The 2.7'x2.7' sub-image covers none of the XRT error circle. No correction has been made for the expected extinction corresponding to E(B-V) of 0.01.
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:     Fri 04 Oct 19 18:42:36 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     927825,   Seg_Num: 0
GRB_RA:           31.6694d {+02h 06m 40.65s} (J2000),
                  31.8791d {+02h 07m 30.97s} (current),
                  31.1384d {+02h 04m 33.21s} (1950)
GRB_DEC:         -36.9334d {-36d 56' 00.2"} (J2000),
                 -36.8399d {-36d 50' 23.6"} (current),
                 -37.1710d {-37d 10' 15.6"} (1950)
GRB_ERROR:       3.5 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18760 TJD;   277 DOY;   19/10/04
IMG_START_TIME:  65399.00 SOD {18:09:59.00} UT,   176.3 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       190.35d {+12h 41m 23s}   -4.45d {-04d 27' 03"}
SUN_DIST:        134.08 [deg]   Sun_angle= 10.6 [hr] (West of Sun)
MOON_POSTN:      270.73d {+18h 02m 54s}  -22.27d {-22d 16' 01"}
MOON_DIST:        98.97 [deg]
MOON_ILLUM:      41 [%]
GAL_COORDS:      249.30,-71.33 [deg] galactic lon,lat of the burst
ECL_COORDS:       12.11,-45.91 [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 0.11% < P(seren) < 0.58%.

GCN Circular #25950
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 2401 s of XRT Photon Counting mode data and 5 UVOT images for GRB 191004A, 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 = 31.66842, -36.93302 which is equivalent to:
```
RA (J2000): 02h 06m 40.42s
Dec (J2000): -36d 55' 58.9"
```
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 #25952
K. E. Heintz (Univ. of Iceland), D. B. Malesani (DTU space), and S. Moran (NOT), report on behalf of a larger collaboration:
We observed the field of the Swift-detected GRB 191004A (Cenko et al., GCN 25945) with the Nordic Optical Telescope (NOT) equipped with StanCAM. We obtained 3x300s exposures with the Bessel R filter starting at 02:10:34 UT on October 5 (i.e. 8.05 hr post-burst). We do not detect the previously reported optical afterglow (Cenko et al., GCN 25945; Lipunov et al., GCN 25944), down to a limit of R > 23.5 mag, calibrated against the photometry of nearby field stars from the USNO-B1 catalog.
GCN Circular #25953
T. Sakamoto (AGU), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), S. B. Cenko (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-61 to T+242 sec from recent telemetry downlinks, we report further analysis of BAT GRB 191004A (trigger #927825) (Cenko, et al., GCN Circ. 25945). The BAT ground-calculated position is RA, Dec = 31.716, -36.932 deg, which is
```
   RA(J2000)  =  02h 06m 51.8s
   Dec(J2000) = -36d 55' 54.0"
```
with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 26%.
The mask-weighted light curve has two overlapping peaks starting at ~T-0.2 sec, peaking at ~T_zero, and ending at ~3.1 sec. T90 (15-350 keV) is 2.44 +- 0.08 sec (estimated error including systematics).
The time-averaged spectrum from T-0.09 to T+2.58 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.35 +- 0.08. The fluence in the 15-150 keV band is 1.3 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-0.09 sec in the 15-150 keV band is 7.8 +- 0.5 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/927825/BA/
GCN Circular #25957
J. D. Gropp (PSU), A. Tohuvavohu (U. Toronto), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) , M. Capalbi (INAF-IASFPA), J.A. Kennea (PSU) and V. Lipunov report on behalf of the Swift-XRT team: report on behalf of the Swift-XRT team:
We have analysed 4.8 ks of XRT data for GRB 191004A (Lipunov et al. GCN Circ. 25944), from 86 s to 12.4 ks after the BAT trigger. The data comprise 88 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN Circ. 25950).
The light curve can be modelled with an initial power-law decay with an index of alpha=0.74 (+0.07, -0.08), followed by a break at T+883 s to an alpha of 1.36 (+0.34, -0.10).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.04 (+0.21, -0.13). The best-fitting absorption column is 2.0 (+3.8, -0.5) x 10^20 cm^-2, consistent with the Galactic value of 1.5 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.81 (+0.14, -0.13) and a best-fitting absorption column of 6.0 (+3.4, -3.1) x 10^20 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.6 x 10^-11 (4.0 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     6.0 (+3.4, -3.1) x 10^20 cm^-2
Galactic foreground: 1.5 x 10^20 cm^-2
Excess significance: 2.4 sigma
Photon index:	     1.81 (+0.14, -0.13)
```
If the light curve continues to decay with a power-law decay index of 1.36, the count rate at T+24 hours will be 2.9 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.1 x 10^-13 (1.2 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/00927825.
This circular is an official product of the Swift-XRT team.
GCN Circular #25959
P. Schady (Univ. of Bath), J. Balmer (MPE Garching), and A. Nicuesa Guelbenzu (TLS Tautenburg) report:
We observed the field of GRB 191004A (Swift trigger 927825; Cenko et al., GCN #25945) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at ESO La Silla Observatory (Chile).
Observations started at 01:56 UT on 5th October, 7.8 hours after the GRB trigger. They were performed at an average seeing of 1.4" and at an average airmass of 1.5.
We do not detect a source at the position of the Swift-XRT and MASTER afterglow (Osborne et al., GCN #25950; Lipunov et al., GCN #25944) down to the following 3-sigma limits (all AB magnitude):
```
g' > 23.7 mag
r' > 24.2 mag
i' > 23.5 mag
z' > 23.3 mag
J > 21.4 mag
H > 20.4 mag
K > 19.9 mag
```
The given limits are derived based on calibrating the images against Sky-Mapper and 2MASS field stars and are not corrected for the Galactic foreground extinction corresponding to a reddening of E_(B-V)= 0.01 in the direction of the burst (Schlafly & Finkbeiner 2011).
We acknowledge the excellent support from Regis Lachaume in La Silla in acquiring these observations.
GCN Circular #25971
R. Strausbaugh (U. of the Virgin Islands), A. Cucchiara (U. of the Virgin Islands/College of Marin) report on behalf of a larger collaboration:
We observed Swift GRB 191004A (Barthelmy et al., GCN 25945) with the LCO 1-m Sinistro instrument on September 4, from 20:12 to 20:47 UT (corresponding to 1.70 to 2.28 hours from the GRB trigger time) with the Bessel R and I filters.
We performed a series of 10x180s exposures in each band. We do not detect a significant source in individual frames, but we do detect a source in co-added frames that is not present in either USNO-B1.0 or 2MASS surveys and is consistent with the optical afterglow location (Evans et al., GCN 25950) with the following magnitudes:
```
R = 22.89 +/- 0.10
I = 21.00 +/- 0.09
```
This flux is calibrated against several USNO-B1.0 objects near the GRB location but is not corrected for Galactic Extinction.
These observations were possible thanks to the USVI NASA-EPSCoR Research Infrastructure Development (RID) grant NNX16AL44A.
GCN Circular #25972
GRB 191004A: Swift/UVOT Detection
S. J. LaPorte (PSU) and S. B. Cenko (GSFC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 191004A 84 s after the BAT trigger (Cenko et al., GCN Circ. 25945). A fading source consistent with the XRT position (Osborne et al. GCN Circ. 25950) 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

b                       582             775             38         >18.83
uvm2                680             873             38         >18.00
u                       327             750           265         >19.60
v                       656            1104            58         >18.06
uvw1                705              898            38         >17.89
uvw2                632            1080            58         >18.28
white                115            1054          333           19.78+-0.16

white              5567          12438          956         >21.24
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.01 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #25973
D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, M. Ulanov, A. Tsvetkova, A. Lysenko, A. Kozlova, and T. Cline on behalf of the Konus-Wind team, report:
The long-duration GRB 191004A (Swift-BAT detection: Cenko et al., GCN circ. 25945; Sakamoto et al., GCN circ. 25953) triggered Konus-Wind at T0=65226.378 s UT (18:07:06.378).
The burst light curve shows a multi-peaked structure which starts at ~T0-0.2 s and has a total duration of ~5 s. The emission is seen up to ~1 MeV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB191004_T65226/
As observed by Konus-Wind, the burst had a fluence of 2.00(-0.41,+0.62)x10^-6 erg/cm2, and a 64-ms peak flux, measured from T0+1.872 s, of 2.38(-0.83,+1.02)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the burst (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 2 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.69(-0.61,+0.83) and Ep = 157(-37,+95) keV (chi2 = 49/57 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.0 (chi2 = 48/56 dof).
All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
GCN Circular #25981
K. Yamaoka (Nagoya U), A. Yoshida, T. Sakamoto, V. Pal'shin, S. Sugita (AGU), Y. Kawakubo (LSU), S. Nakahira (RIKEN), Y. Asaoka, S. Torii (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC), M. L. Cherry (LSU), S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena), and the CALET collaboration:
The soft GRB 191004A (Swift-BAT detection: Cenko et al., GCN Circ. 25945, Sakamoto et al., GCN Circ. 25953; Konus-Wind observation: Svinkin et al., GCN Circ. 25973) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 18:07:05.528 UTC on 4 October 2019. The burst signal was seen by all CGBM detectors. No real-time CGBM GCN notice was distributed about this trigger because the real-time communication from the ISS was off (loss of signal).
The burst light curve shows two pulses which start at T-2.7 sec and end at T+0.0 sec. The T90 and T50 durations measured by the SGM data are 2.6 +- 0.3 sec and 1.9 +- 1.4 sec (40-1000 keV), respectively.
The ground processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1254247608/
The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University.
GCN Circular #26324
P. Schady (Univ. of Bath) reports:
I would like to correct a mistake in the GROND g'r'i'z' upper limits reported in Schady et al. (GCN #25959). The reported afterglow position (Osborne et al., GCN #25950; Lipunov et al., GCN #25944) lay at the edge of the g'r'i'z' field of view, where the exposure coverage is not complete. Taking into account the exposure map reduces the optical band 3 sigma upper limits reported in GCN #25959 by around 0.5 mag. The correct 3 sigma upper limits (AB system) are as follows:
```
g� > 23.3
r� > 23.7
i� > 23.1
z� > 22.7
```
I would like to thank Jochen Greiner for bringing this mistake to my attention.

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Jochen Greiner, last update: 02-Dec-2019 [Disclaimer]