Gamma-ray Burst 180925A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Tue 25 Sep 18 14:38:06 UT
  NOTICE_TYPE:     Swift-BAT GRB Position
  TRIGGER_NUM:     863421,   Seg_Num: 0
  GRB_RA:          315.213d {+21h 00m 51s} (J2000),
                   315.606d {+21h 02m 25s} (current),
                   314.157d {+20h 56m 38s} (1950)
  GRB_DEC:         -64.443d {-64d 26' 35"} (J2000),
                   -64.369d {-64d 22' 08"} (current),
                   -64.639d {-64d 38' 20"} (1950)
  GRB_ERROR:       3.00 [arcmin radius, statistical only]
  GRB_INTEN:       6189 [cnts]    Image_Peak=155 [image_cnts]
  TRIGGER_DUR:     2.048 [sec] 
  TRIGGER_INDEX:   486     E_range: 50-350 keV
  BKG_INTEN:       46544 [cnts]
  BKG_TIME:        52618.34 SOD {14:36:58.34} UT
  BKG_DUR:         24 [sec]
  GRB_DATE:        18386 TJD;   268 DOY;   18/09/25
  GRB_TIME:        52651.94 SOD {14:37:31.94} UT
  GRB_PHI:         -146.93 [deg]
  GRB_THETA:        49.08 [deg]
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     27.33 [sigma]
  IMAGE_SIGNIF:    7.58 [sigma]
  MERIT_PARAMS:     +1  +0  +0  +1  +3  -2  +0  +0 +27  +0 
  SUN_POSTN:       182.28d {+12h 09m 07s}   -0.99d {-00d 59' 12"}
  SUN_DIST:        106.33 [deg]   Sun_angle= -8.9 [hr] (East of Sun)
  MOON_POSTN:        9.41d {+00h 37m 39s}   -0.84d {-00d 50' 37"}
  MOON_DIST:        74.41 [deg]
  MOON_ILLUM:      100 [%]
  GAL_COORDS:      330.51,-38.09 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      295.65,-44.98 [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 = 76.41,-0.33 [deg].  
  

• red DSS finding chart ps-file
  
  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Tue 25 Sep 18 14:39:55 UT
  NOTICE_TYPE:     Swift-XRT Image
  TRIGGER_NUM:     863421,   Seg_Num: 0
  GRB_RA:          315.2058d {+21h 00m 49.3s} (J2000),
                   315.5988d {+21h 02m 23.7s} (current),
                   314.1492d {+20h 56m 35.8s} (1950)
  GRB_DEC:         -64.4565d {-64d 27' 23.4"} (J2000),
                   -64.3822d {-64d 22' 56.0"} (current),
                   -64.6523d {-64d 39' 08.1"} (1950)
  GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
  GRB_INTEN:       104 [cnts]
  IMG_START_DATE:  18386 TJD;   268 DOY;   18/09/25
  IMG_START_TIME:  52760.83 SOD {14:39:20.83} UT,   108.9 [sec] since BAT Trigger Time
  CENTROID_X:      260.74,  raw= 261  [pixels]
  CENTROID_Y:      305.85,  raw= 306  [pixels]
  ROLL:            229.61 [deg]
  GAIN:            1
  MODE:            3, Long Image mode
  WAVEFORM:        134
  EXPO_TIME:       2.50 [sec]
  GRB_POS_XRT_Y:   17.57
  GRB_POS_XRT_Z:   -107.61
  IMAGE_URL:       sw00863421000msxps_rw.img
  SUN_POSTN:       182.28d {+12h 09m 07s}   -0.99d {-00d 59' 13"}
  SUN_DIST:        106.32 [deg]   Sun_angle= -8.9 [hr] (East of Sun)
  MOON_POSTN:        9.43d {+00h 37m 43s}   -0.84d {-00d 50' 16"}
  MOON_DIST:        74.43 [deg]
  MOON_ILLUM:      100 [%]
  GAL_COORDS:      330.50,-38.08 [deg] galactic lon,lat of the burst
  ECL_COORDS:      295.64,-44.99 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Image.  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Tue 25 Sep 18 14:39:57 UT
  NOTICE_TYPE:     Swift-XRT Processed Image
  TRIGGER_NUM:     863421,   Seg_Num: 0
  GRB_RA:          315.2058d {+21h 00m 49.3s} (J2000),
                   315.5988d {+21h 02m 23.7s} (current),
                   314.1492d {+20h 56m 35.8s} (1950)
  GRB_DEC:         -64.4565d {-64d 27' 23.4"} (J2000),
                   -64.3822d {-64d 22' 56.0"} (current),
                   -64.6523d {-64d 39' 08.1"} (1950)
  GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
  GRB_INTEN:       104 [cnts]
  IMG_START_DATE:  18386 TJD;   268 DOY;   18/09/25
  IMG_START_TIME:  52760.83 SOD {14:39:20.83} UT,   108.9 [sec] since BAT Trigger Time
  CENTROID_X:      260.74,  raw= 261  [pixels]
  CENTROID_Y:      305.85,  raw= 306  [pixels]
  ROLL:            229.61 [deg]
  GAIN:            1
  MODE:            3, Long Image mode
  WAVEFORM:        134
  EXPO_TIME:       2.50 [sec]
  GRB_POS_XRT_Y:   17.57
  GRB_POS_XRT_Z:   -107.61
  IMAGE_URL:       sw00863421000msxps_rw.img
  SUN_POSTN:       182.28d {+12h 09m 07s}   -0.99d {-00d 59' 13"}
  SUN_DIST:        106.32 [deg]   Sun_angle= -8.9 [hr] (East of Sun)
  MOON_POSTN:        9.43d {+00h 37m 43s}   -0.84d {-00d 50' 16"}
  MOON_DIST:        74.43 [deg]
  MOON_ILLUM:      100 [%]
  GAL_COORDS:      330.50,-38.08 [deg] galactic lon,lat of the burst
  ECL_COORDS:      295.64,-44.99 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Processed Image.  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Tue 25 Sep 18 14:39:45 UT
  NOTICE_TYPE:     Swift-XRT Position
  TRIGGER_NUM:     863421,   Seg_Num: 0
  GRB_RA:          315.2058d {+21h 00m 49.39s} (J2000),
                   315.5988d {+21h 02m 23.70s} (current),
                   314.1492d {+20h 56m 35.81s} (1950)
  GRB_DEC:         -64.4565d {-64d 27' 23.4"} (J2000),
                   -64.3822d {-64d 22' 56.0"} (current),
                   -64.6523d {-64d 39' 08.1"} (1950)
  GRB_ERROR:       4.9 [arcsec radius, statistical plus systematic, 90% containment]
  GRB_INTEN:       3.19e-09 [erg/cm2/sec]
  GRB_SIGNIF:      10.19 [sigma]
  IMG_START_DATE:  18386 TJD;   268 DOY;   18/09/25
  IMG_START_TIME:  52760.83 SOD {14:39:20.83} UT,   108.9 [sec] since BAT Trigger Time
  TAM[0-3]:        327.67 237.16 261.60 243.68
  AMPLIFIER:       2
  WAVEFORM:        134
  SUN_POSTN:       182.28d {+12h 09m 07s}   -0.99d {-00d 59' 13"}
  SUN_DIST:        106.32 [deg]   Sun_angle= -8.9 [hr] (East of Sun)
  MOON_POSTN:        9.43d {+00h 37m 43s}   -0.84d {-00d 50' 18"}
  MOON_DIST:        74.43 [deg]
  MOON_ILLUM:      100 [%]
  GAL_COORDS:      330.50,-38.08 [deg] galactic lon,lat of the burst
  ECL_COORDS:      295.64,-44.99 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Coordinates.  
  COMMENTS:        The XRT position is 0.80 arcmin from the BAT position.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Tue 25 Sep 18 14:41:34 UT
  NOTICE_TYPE:     Swift-BAT GRB Lightcurve
  TRIGGER_NUM:     863421,   Seg_Num: 0
  GRB_RA:          315.213d {+21h 00m 51s} (J2000),
                   315.606d {+21h 02m 25s} (current),
                   314.157d {+20h 56m 38s} (1950)
  GRB_DEC:         -64.443d {-64d 26' 35"} (J2000),
                   -64.369d {-64d 22' 08"} (current),
                   -64.639d {-64d 38' 20"} (1950)
  GRB_DATE:        18386 TJD;   268 DOY;   18/09/25
  GRB_TIME:        52651.94 SOD {14:37:31.94} UT
  TRIGGER_INDEX:   486
  GRB_PHI:         -146.93 [deg]
  GRB_THETA:        49.08 [deg]
  DELTA_TIME:      0.00 [sec]
  TRIGGER_DUR:     2.048 [sec] 
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     27.33 [sigma]
  IMAGE_SIGNIF:    7.58 [sigma]
  LC_URL:          sw00863421000msb.lc
  SUN_POSTN:       182.28d {+12h 09m 07s}   -0.99d {-00d 59' 15"}
  SUN_DIST:        106.33 [deg]   Sun_angle= -8.9 [hr] (East of Sun)
  MOON_POSTN:        9.44d {+00h 37m 46s}   -0.83d {-00d 49' 58"}
  MOON_DIST:        74.43 [deg]
  MOON_ILLUM:      100 [%]
  GAL_COORDS:      330.51,-38.09 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      295.65,-44.98 [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 = 76.41,-0.33 [deg].  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Tue 25 Sep 18 14:42:20 UT
  NOTICE_TYPE:     Swift-UVOT Source List
  TRIGGER_NUM:     863421,   Seg_Num: 0
  POINT_RA:        315.250d {+21h 01m 00s} (J2000)
  POINT_DEC:       -64.434d {-64d 26' 01"} (J2000)
  POINT_ROLL:      229.608d
  IMG_START_DATE:  18386 TJD;   268 DOY;   18/09/25
  IMG_START_TIME:  52770.39 SOD {14:39:30.39} UT,   118.4 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        1.670
  N_STARS:         65
  X_OFFSET:        616 [pixels]
  Y_OFFSET:        496 [pixels]
  X_MAX:           1575 [pixels]
  Y_MAX:           1455 [pixels]
  DET_THRESH:      11
  PHOTO_THRESH:    5
  SL_URL:          sw00863421000msufc0118.fits
  SUN_POSTN:       182.28d {+12h 09m 07s}   -0.99d {-00d 59' 16"}
  SUN_DIST:        106.35 [deg]   Sun_angle= -8.9 [hr] (East of Sun)
  MOON_POSTN:        9.45d {+00h 37m 48s}   -0.83d {-00d 49' 49"}
  MOON_DIST:        74.42 [deg]
  MOON_ILLUM:      100 [%]
  GAL_COORDS:      330.52,-38.10 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      295.67,-44.98 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Source List.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Tue 25 Sep 18 14:42:34 UT
  NOTICE_TYPE:     Swift-UVOT Processed Source List
  TRIGGER_NUM:     863421,   Seg_Num: 0
  POINT_RA:        315.250d {+21h 01m 00s} (J2000)
  POINT_DEC:       -64.434d {-64d 26' 01"} (J2000)
  POINT_ROLL:      229.608d
  IMG_START_DATE:  18386 TJD;   268 DOY;   18/09/25
  IMG_START_TIME:  52770.39 SOD {14:39:30.39} UT,   118.4 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        1.670
  N_STARS:         65
  X_OFFSET:        616 [pixels]
  Y_OFFSET:        496 [pixels]
  X_MAX:           1575 [pixels]
  Y_MAX:           1455 [pixels]
  DET_THRESH:      11
  PHOTO_THRESH:    5
  SL_URL:          sw00863421000msufc0118.fits
  SUN_POSTN:       182.28d {+12h 09m 07s}   -0.99d {-00d 59' 16"}
  SUN_DIST:        106.35 [deg]   Sun_angle= -8.9 [hr] (East of Sun)
  MOON_POSTN:        9.45d {+00h 37m 48s}   -0.83d {-00d 49' 46"}
  MOON_DIST:        74.42 [deg]
  MOON_ILLUM:      100 [%]
  GAL_COORDS:      330.52,-38.10 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      295.67,-44.98 [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 25 Sep 18 14:43:38 UT
  NOTICE_TYPE:     Swift-UVOT Image
  TRIGGER_NUM:     863421,   Seg_Num: 0
  POINT_RA:        315.250d {+21h 01m 00s} (J2000)
  POINT_DEC:       -64.434d {-64d 26' 01"} (J2000)
  ROLL:            229.608d
  IMG_START_DATE:  18386 TJD;   268 DOY;   18/09/25
  IMG_START_TIME:  52770.39 SOD {14:39:30.39} UT,   118.4 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     559579192
  X_OFFSET:        973 [pixels]
  Y_OFFSET:        729 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       1133
  Y_GRB_POS:       889
  BINNING_INDEX:   1
  IM_URL:          sw00863421000msuni0140.fits
  SUN_POSTN:       182.28d {+12h 09m 07s}   -0.99d {-00d 59' 17"}
  SUN_DIST:        106.35 [deg]   Sun_angle= -8.9 [hr] (East of Sun)
  MOON_POSTN:        9.46d {+00h 37m 50s}   -0.83d {-00d 49' 34"}
  MOON_DIST:        74.43 [deg]
  MOON_ILLUM:      100 [%]
  GAL_COORDS:      330.52,-38.10 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      295.67,-44.98 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Image.  
  COMMENTS:        The GRB Position came from the XRT Position Command.  
  COMMENTS:        The image has 2x2 binning (compression).  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Tue 25 Sep 18 14:43:51 UT
  NOTICE_TYPE:     Swift-UVOT Processed Image
  TRIGGER_NUM:     863421,   Seg_Num: 0
  POINT_RA:        315.250d {+21h 01m 00s} (J2000)
  POINT_DEC:       -64.434d {-64d 26' 01"} (J2000)
  ROLL:            229.608d
  IMG_START_DATE:  18386 TJD;   268 DOY;   18/09/25
  IMG_START_TIME:  52770.39 SOD {14:39:30.39} UT,   118.4 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     559579192
  X_OFFSET:        973 [pixels]
  Y_OFFSET:        729 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       1133
  Y_GRB_POS:       889
  BINNING_INDEX:   1
  IM_URL:          sw00863421000msuni0140.fits
  SUN_POSTN:       182.28d {+12h 09m 07s}   -0.99d {-00d 59' 17"}
  SUN_DIST:        106.35 [deg]   Sun_angle= -8.9 [hr] (East of Sun)
  MOON_POSTN:        9.46d {+00h 37m 51s}   -0.83d {-00d 49' 32"}
  MOON_DIST:        74.43 [deg]
  MOON_ILLUM:      100 [%]
  GAL_COORDS:      330.52,-38.10 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      295.67,-44.98 [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:     Tue 25 Sep 18 14:46:40 UT
  NOTICE_TYPE:     Swift-UVOT Source List
  TRIGGER_NUM:     863421,   Seg_Num: 0
  POINT_RA:        315.252d {+21h 01m 01s} (J2000)
  POINT_DEC:       -64.432d {-64d 25' 53"} (J2000)
  POINT_ROLL:      229.606d
  IMG_START_DATE:  18386 TJD;   268 DOY;   18/09/25
  IMG_START_TIME:  52928.32 SOD {14:42:08.32} UT,   276.4 [sec] since BAT Trigger Time
  FILTER:          7, U
  BKG_MEAN:        0.454
  N_STARS:         45
  X_OFFSET:        653 [pixels]
  Y_OFFSET:        409 [pixels]
  X_MAX:           1612 [pixels]
  Y_MAX:           1368 [pixels]
  DET_THRESH:      6
  PHOTO_THRESH:    3
  SL_URL:          sw00863421000msufc0276.fits
  SUN_POSTN:       182.28d {+12h 09m 08s}   -0.99d {-00d 59' 20"}
  SUN_DIST:        106.35 [deg]   Sun_angle= -8.9 [hr] (East of Sun)
  MOON_POSTN:        9.48d {+00h 37m 56s}   -0.82d {-00d 49' 00"}
  MOON_DIST:        74.44 [deg]
  MOON_ILLUM:      100 [%]
  GAL_COORDS:      330.52,-38.10 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      295.68,-44.97 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Source List.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Tue 25 Sep 18 14:46:55 UT
  NOTICE_TYPE:     Swift-UVOT Processed Source List
  TRIGGER_NUM:     863421,   Seg_Num: 0
  POINT_RA:        315.252d {+21h 01m 01s} (J2000)
  POINT_DEC:       -64.432d {-64d 25' 53"} (J2000)
  POINT_ROLL:      229.606d
  IMG_START_DATE:  18386 TJD;   268 DOY;   18/09/25
  IMG_START_TIME:  52928.32 SOD {14:42:08.32} UT,   276.4 [sec] since BAT Trigger Time
  FILTER:          7, U
  BKG_MEAN:        0.454
  N_STARS:         45
  X_OFFSET:        653 [pixels]
  Y_OFFSET:        409 [pixels]
  X_MAX:           1612 [pixels]
  Y_MAX:           1368 [pixels]
  DET_THRESH:      6
  PHOTO_THRESH:    3
  SL_URL:          sw00863421000msufc0276.fits
  SUN_POSTN:       182.28d {+12h 09m 08s}   -0.99d {-00d 59' 20"}
  SUN_DIST:        106.35 [deg]   Sun_angle= -8.9 [hr] (East of Sun)
  MOON_POSTN:        9.49d {+00h 37m 57s}   -0.82d {-00d 48' 57"}
  MOON_DIST:        74.45 [deg]
  MOON_ILLUM:      100 [%]
  GAL_COORDS:      330.52,-38.10 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      295.68,-44.97 [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 25 Sep 18 14:47:47 UT
  NOTICE_TYPE:     Swift-UVOT Image
  TRIGGER_NUM:     863421,   Seg_Num: 0
  POINT_RA:        315.252d {+21h 01m 01s} (J2000)
  POINT_DEC:       -64.432d {-64d 25' 53"} (J2000)
  ROLL:            229.606d
  IMG_START_DATE:  18386 TJD;   268 DOY;   18/09/25
  IMG_START_TIME:  52928.32 SOD {14:42:08.32} UT,   276.4 [sec] since BAT Trigger Time
  FILTER:          7, U
  EXPOSURE_ID:     559579349
  X_OFFSET:        973 [pixels]
  Y_OFFSET:        729 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       1133
  Y_GRB_POS:       889
  BINNING_INDEX:   1
  IM_URL:          sw00863421000msuni0298.fits
  SUN_POSTN:       182.28d {+12h 09m 08s}   -0.99d {-00d 59' 21"}
  SUN_DIST:        106.35 [deg]   Sun_angle= -8.9 [hr] (East of Sun)
  MOON_POSTN:        9.49d {+00h 37m 58s}   -0.81d {-00d 48' 48"}
  MOON_DIST:        74.45 [deg]
  MOON_ILLUM:      100 [%]
  GAL_COORDS:      330.52,-38.10 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      295.68,-44.97 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Image.  
  COMMENTS:        The GRB Position came from the XRT Position Command.  
  COMMENTS:        The image has 2x2 binning (compression).  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Tue 25 Sep 18 14:48:02 UT
  NOTICE_TYPE:     Swift-UVOT Processed Image
  TRIGGER_NUM:     863421,   Seg_Num: 0
  POINT_RA:        315.252d {+21h 01m 01s} (J2000)
  POINT_DEC:       -64.432d {-64d 25' 53"} (J2000)
  ROLL:            229.606d
  IMG_START_DATE:  18386 TJD;   268 DOY;   18/09/25
  IMG_START_TIME:  52928.32 SOD {14:42:08.32} UT,   276.4 [sec] since BAT Trigger Time
  FILTER:          7, U
  EXPOSURE_ID:     559579349
  X_OFFSET:        973 [pixels]
  Y_OFFSET:        729 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       1133
  Y_GRB_POS:       889
  BINNING_INDEX:   1
  IM_URL:          sw00863421000msuni0298.fits
  SUN_POSTN:       182.28d {+12h 09m 08s}   -0.99d {-00d 59' 21"}
  SUN_DIST:        106.35 [deg]   Sun_angle= -8.9 [hr] (East of Sun)
  MOON_POSTN:        9.50d {+00h 37m 59s}   -0.81d {-00d 48' 45"}
  MOON_DIST:        74.45 [deg]
  MOON_ILLUM:      100 [%]
  GAL_COORDS:      330.52,-38.10 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      295.68,-44.97 [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 Circular #23268
  J.D. Gropp (PSU), A. P. Beardmore (U Leicester), P. A. Evans (U Leicester), J. A. Kennea (PSU), H. A. Krimm (NSF/USRA), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), B. Sbarufatti (PSU), M. H. Siegel (PSU), R. L. C. Starling (U Leicester) and A. Tohuvavohu (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
  At 14:37:31 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 180925A (trigger=863421). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 315.213, -64.443 which is

     RA(J2000) = 21h 00m 51s
     Dec(J2000) = -64d 26' 35"
  

  with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of at least 30 sec. The peak count rate was ~3500 counts/sec (15-350 keV), at ~1 sec after the trigger.
  The XRT began observing the field at 14:39:20.8 UT, 108.9 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 315.20546, -64.45727 which is equivalent to:

     RA(J2000)  = 21h 00m 49.31s
     Dec(J2000) = -64d 27' 26.2"
  

  with an uncertainty of 4.5 arcseconds (radius, 90% containment). This location is 52 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. We cannot determine whether the source is fading at the present time. No spectrum from the promptly downlinked event data is yet available to determine the column density.
  The initial flux in the 2.5 s image was 3.19e-09 erg cm^-2 s^-1 (0.2-10 keV).
  UVOT took a finding chart exposure of 150 seconds with the White filter starting 118 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 0.03.
  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/too.html.)
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Tue 25 Sep 18 14:54:44 UT
  NOTICE_TYPE:     Swift-UVOT Source List
  TRIGGER_NUM:     863421,   Seg_Num: 0
  POINT_RA:        315.252d {+21h 01m 01s} (J2000)
  POINT_DEC:       -64.432d {-64d 25' 53"} (J2000)
  POINT_ROLL:      229.606d
  IMG_START_DATE:  18386 TJD;   268 DOY;   18/09/25
  IMG_START_TIME:  53508.62 SOD {14:51:48.62} UT,   856.7 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        1.716
  N_STARS:         186
  X_OFFSET:        413 [pixels]
  Y_OFFSET:        169 [pixels]
  X_MAX:           1852 [pixels]
  Y_MAX:           1608 [pixels]
  DET_THRESH:      11
  PHOTO_THRESH:    5
  SL_URL:          sw00863421000msufc0856.fits
  SUN_POSTN:       182.29d {+12h 09m 09s}   -0.99d {-00d 59' 28"}
  SUN_DIST:        106.35 [deg]   Sun_angle= -8.9 [hr] (East of Sun)
  MOON_POSTN:        9.55d {+00h 38m 12s}   -0.79d {-00d 47' 29"}
  MOON_DIST:        74.49 [deg]
  MOON_ILLUM:      100 [%]
  GAL_COORDS:      330.52,-38.11 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      295.68,-44.97 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Source List.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Tue 25 Sep 18 14:55:03 UT
  NOTICE_TYPE:     Swift-UVOT Processed Source List
  TRIGGER_NUM:     863421,   Seg_Num: 0
  POINT_RA:        315.252d {+21h 01m 01s} (J2000)
  POINT_DEC:       -64.432d {-64d 25' 53"} (J2000)
  POINT_ROLL:      229.606d
  IMG_START_DATE:  18386 TJD;   268 DOY;   18/09/25
  IMG_START_TIME:  53508.62 SOD {14:51:48.62} UT,   856.7 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        1.716
  N_STARS:         186
  X_OFFSET:        413 [pixels]
  Y_OFFSET:        169 [pixels]
  X_MAX:           1852 [pixels]
  Y_MAX:           1608 [pixels]
  DET_THRESH:      11
  PHOTO_THRESH:    5
  SL_URL:          sw00863421000msufc0856.fits
  SUN_POSTN:       182.29d {+12h 09m 09s}   -0.99d {-00d 59' 28"}
  SUN_DIST:        106.35 [deg]   Sun_angle= -8.9 [hr] (East of Sun)
  MOON_POSTN:        9.55d {+00h 38m 13s}   -0.79d {-00d 47' 26"}
  MOON_DIST:        74.49 [deg]
  MOON_ILLUM:      100 [%]
  GAL_COORDS:      330.52,-38.11 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      295.68,-44.97 [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 25 Sep 18 14:55:35 UT
  NOTICE_TYPE:     Swift-XRT Position UPDATE
  TRIGGER_NUM:     863421,   Seg_Num: 0
  GRB_RA:          315.2038d {+21h 00m 48.91s} (J2000),
                   315.5968d {+21h 02m 23.23s} (current),
                   314.1472d {+20h 56m 35.33s} (1950)
  GRB_DEC:         -64.4569d {-64d 27' 24.8"} (J2000),
                   -64.3826d {-64d 22' 57.5"} (current),
                   -64.6527d {-64d 39' 09.5"} (1950)
  GRB_ERROR:       2.5 [arcsec radius, statistical plus systematic, 90% containment]
  GRB_INTEN:       1.00e-10 [erg/cm2/sec]
  GRB_SIGNIF:      10.00 [sigma]
  IMG_START_DATE:  18386 TJD;   268 DOY;   18/09/25
  IMG_START_TIME:  52960.00 SOD {14:42:40.00} UT,   308.1 [sec] since BAT Trigger Time
  TAM[0-3]:        100.00 100.00 100.00 100.00
  AMPLIFIER:       1
  WAVEFORM:        31
  SUN_POSTN:       182.29d {+12h 09m 09s}   -0.99d {-00d 59' 29"}
  SUN_DIST:        106.31 [deg]   Sun_angle= -8.9 [hr] (East of Sun)
  MOON_POSTN:        9.56d {+00h 38m 14s}   -0.79d {-00d 47' 20"}
  MOON_DIST:        74.53 [deg]
  MOON_ILLUM:      100 [%]
  GAL_COORDS:      330.50,-38.08 [deg] galactic lon,lat of the burst
  ECL_COORDS:      295.63,-44.99 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Coordinates.  
  COMMENTS:        This Notice was ground-generated -- not flight-generated.  
  COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
  COMMENTS:        TAM values, flux and significance fields are not valid.  
  COMMENTS:        This position was automatically generated on the ground using  
  COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
  COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
  COMMENTS:        This position was enhanced using UVOT field astrometry.  
  COMMENTS:        The probability that this is a serendipitous source in the  
  COMMENTS:        SPER window is 1.1% < P(seren) < 2.8%.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Tue 25 Sep 18 14:57:12 UT
  NOTICE_TYPE:     Swift-UVOT Image
  TRIGGER_NUM:     863421,   Seg_Num: 0
  POINT_RA:        315.252d {+21h 01m 01s} (J2000)
  POINT_DEC:       -64.432d {-64d 25' 53"} (J2000)
  ROLL:            229.606d
  IMG_START_DATE:  18386 TJD;   268 DOY;   18/09/25
  IMG_START_TIME:  53508.62 SOD {14:51:48.62} UT,   856.7 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     559579930
  X_OFFSET:        972 [pixels]
  Y_OFFSET:        728 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       1132
  Y_GRB_POS:       888
  BINNING_INDEX:   1
  IM_URL:          sw00863421000msuni0878.fits
  SUN_POSTN:       182.29d {+12h 09m 09s}   -0.99d {-00d 59' 30"}
  SUN_DIST:        106.35 [deg]   Sun_angle= -8.9 [hr] (East of Sun)
  MOON_POSTN:        9.57d {+00h 38m 17s}   -0.78d {-00d 47' 02"}
  MOON_DIST:        74.51 [deg]
  MOON_ILLUM:      100 [%]
  GAL_COORDS:      330.52,-38.11 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      295.68,-44.97 [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).  
  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:     Tue 25 Sep 18 14:57:26 UT
  NOTICE_TYPE:     Swift-UVOT Processed Image
  TRIGGER_NUM:     863421,   Seg_Num: 0
  POINT_RA:        315.252d {+21h 01m 01s} (J2000)
  POINT_DEC:       -64.432d {-64d 25' 53"} (J2000)
  ROLL:            229.606d
  IMG_START_DATE:  18386 TJD;   268 DOY;   18/09/25
  IMG_START_TIME:  53508.62 SOD {14:51:48.62} UT,   856.7 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     559579930
  X_OFFSET:        972 [pixels]
  Y_OFFSET:        728 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       1132
  Y_GRB_POS:       888
  BINNING_INDEX:   1
  IM_URL:          sw00863421000msuni0878.fits
  SUN_POSTN:       182.29d {+12h 09m 10s}   -0.99d {-00d 59' 30"}
  SUN_DIST:        106.35 [deg]   Sun_angle= -8.9 [hr] (East of Sun)
  MOON_POSTN:        9.57d {+00h 38m 17s}   -0.78d {-00d 46' 59"}
  MOON_DIST:        74.51 [deg]
  MOON_ILLUM:      100 [%]
  GAL_COORDS:      330.52,-38.11 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      295.68,-44.97 [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.  
  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 Circular #23270
  P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
  Using promptly downlinked XRT event data for GRB 180925A, we find an enhanced XRT position of the afterglow: RA, Dec: 315.2038, -64.4569 which is equivalent to:

     RA (J2000)  = 21 00 48.92
     Dec (J2000) = -64 27 24.9
  

  with an uncertainty of 2.1 arcseconds (radius, 90% confidence). Analysis of the promptly available data is online at http://www.swift.ac.uk/sper/863421.
  Position enhancement is is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
  This circular is an official product of the Swift-XRT team.
• GCN Circular #23271
  M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
  Using 1212 s of XRT Photon Counting mode data and 1 UVOT images for GRB 180925A, 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 = 315.20075, -64.45690 which is equivalent to:

  RA (J2000): 21h 00m 48.18s
  Dec (J2000): -64d 27' 24.8"
  

  with an uncertainty of 3.8 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 #23272
  B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), A. Tohuvavohu (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA) and J.D. Gropp report on behalf of the Swift-XRT team:
  We have analysed 6.8 ks of XRT data for GRB 180925A (Gropp et al. GCN Circ. 23268), from 115 s to 19.2 ks after the BAT trigger. The data comprise 191 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. 23270).
  The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=1.1 (+/-0.4). At T+169 s the decay steepens to an alpha of 2.55 (+0.49, -0.22). The light curve breaks again at T+296 s to a decay with alpha=7.7 (+0.3, -1.3), and again at T+388 s s to alpha=0.71 (+0.26, -0.51), before a final break at T+1241 s s after which the decay index is 1.42 (+0.15, -0.13).
  A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.42 (+/-0.08). The best-fitting absorption column is 1.4 (+/-0.4) x 10^21 cm^-2, in excess of the Galactic value of 3.3 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.77 (+/-0.17) and a best-fitting absorption column of 1.5 (+0.6, -0.5) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.9 x 10^-11 (4.8 x 10^-11) erg cm^-2 count^-1.
  A summary of the PC-mode spectrum is thus:

  Total column:	     1.5 (+0.6, -0.5) x 10^21 cm^-2
  Galactic foreground: 3.3 x 10^20 cm^-2
  Excess significance: 3.7 sigma
  Photon index:	     1.77 (+/-0.17)
  

  If the light curve continues to decay with a power-law decay index of 1.42, the count rate at T+24 hours will be 8.2 x 10^-4 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.2 x 10^-14 (3.9 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/00863421.
  This circular is an official product of the Swift-XRT team.
• GCN Circular #23273
  T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), J. D. Gropp (PSU), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU) (i.e. the Swift-BAT team):
  Using the data set from T-240 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 180925A (trigger #863421) (Gropp et al., GCN Circ. 23268). The BAT ground-calculated position is RA, Dec = 315.212, -64.450 deg which is

    RA(J2000)  =  21h 00m 50.9s
    Dec(J2000) = -64d 26' 59.2"
  

  with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 15%.
  The mask-weighted light curve shows a multi-peaked structure that starts at ~T-5 s and ends at ~T+105 s. The main peak occurs at ~ T+1 s. T90 (15-350 keV) is 81.70 +- 23.25 sec (estimated error including systematics).
  The time-averaged spectrum from T-4.44 to T+103.96 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.53 +- 0.13. The fluence in the 15-150 keV band is 4.1 +- 0.3 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.87 sec in the 15-150 keV band is 3.1 +- 0.6 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
  The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/863421/BA/
• GCN Circular #23274
  S.W.K. Emery (UCL-MSSL) and J. D. Gropp (PSU) report on behalf of the Swift/UVOT team:
  The Swift/UVOT began settled observations of the field of GRB 180925A 119 s after the BAT trigger (Gropp et al., GCN Circ. 23268). A fading source consistent with the XRT position (Goad et al. GCN Circ. 23271) is detected in the initial UVOT exposures.
  The preliminary UVOT position is:

      RA  (J2000) =  21:00:48.70 = 315.20292 (deg.)
      Dec (J2000) = -64:27:24.82 = -64.456894 (deg.)
  

  with an estimated uncertainty of 0.22 arc sec. (radius, 90% confidence),
  Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:

  Filter         T_start(s)   T_stop(s)      Exp(s)           Mag
  
  white              119          269          147         19.73 +/- 0.17
  white              557         6943          674         20.32 +/- 0.13
  v                  607         7354          549         >19.66
  b                  533         6739          347         20.89 +/- 0.37
  u                  277         6533          579         19.78 +/- 0.21
  uvw1               657         7755          540          20.07 +/- 0.29
  uvm2              1062         7559          413         >20.14
  uvw2               583         7149          510         >20.60
  

  The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.03 in the direction of the burst (Schlegel et al. 1998).
• GCN Circular #23275
  Q. Luo,Y. Huang,G. Li,S. L. Xiong,X. B. Li, C. K. Li, C.Z. Liu, X.F. Li, Z. W. Li, Z. Chang, J. L. Zhao, A. M. Zhang, Y. F. Zhang, X. F. Lu, C. L. Zou (IHEP), Y. J. Jin, Z. Zhang (THU), T. P. Li (IHEP/THU),F. J. Lu, L. M. Song, H. Y. Wang, M. Wu, Y. P. Xu, S. N. Zhang (IHEP), report on behalf of the Insight-HXMT team:
  At 2018-09-25T14:37:27.900 (T0), the Insight-HXMT/HE detected GRB 180925A(trigger ID: HEB180925609) in a routine search of the data, which was also triggered by Swift-BAT (Gropp et al.,GCN 23268).
  The Insight-HXMT/HE light curve mainly consists of a bright pulse with a duration (T90) of 23.23 s measured from T0-2.82 s. The 1-s peak rate, measured from T0+1.8640 s, is 1845.76 cnts/sec. The total counts from this burst is 10107.89 counts. URL_LC: http://www.hxmt.org/images/GRB/HEB180925609_lc.jpg
  All measurements above are made with the CsI detectors operating in the regular mode with the energy range of about 80-800 keV (record energy). Only gamma-rays with energy greater than about 200 keV can penetrate the spacecraft and leave signals in the CsI detectors installed inside of the telescope.
  The analysis results presented above are preliminary, final results will be published elsewhere.
  Insight-HXMT is the first Chinese space X-ray telescope, which was funded jointly by the China National Space Administration (CNSA) and the Chinese Academy of Sciences (CAS). More information about it could be found at: http://www.hxmt.org.
  
• GCN Circular #23276
  D. B. Malesani (DAWN/NBI and DARK/NBI), P. Schady (Univ. Bath), C. C. Thoene (HETH/IAA-CSIC), D. A. Kann (HETH/IAA-CSIC), and N. R. Tanvir (Univ. Leicester) report on behalf of the Stargate collaboration:
  We observed the optical counterpart of GRB 180925A (Gropp et al., GCN 23268; Emery & Gropp, GCN 23274) using the ESO VLT UT2 (Kueyen) equipped with the X-shooter instrument. A 60-seconds image in the SDSS r filter was taken with the acquisition camera, at approximate time 2018 September 26.17 UT (0.56 days after the GRB).
  At a location consistent with that of the UVOT afterglow (Emery & Gropp, GCN 23274), a faint source is marginally visible. Forced photometry, calibrated against nearby USNO-B1 stars, yields R = 22.9 +- 0.4 (Vega).
  No further observations are planned.
  We acknowledge support from the ESO staff at Paranal, in particular Joe Anderson and Jorge Lillo-Box.
• GCN Circular #23291
  A. Kozlova, S. Golenetskii, R. Aptekar, D. Frederiks, M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, report:
  The long-duration GRB 180925A (Swift-BAT detection: Gropp et al., GCN 23268; Ukwatta et al., GCN 23273; Insight-HXMT/HE observation: Luo et al., GCN 23275) triggered Konus-Wind at T0=52650.967 s UT (14:37:30.967).
  The burst light curve shows a multipeaked structure which starts at ~T0 and has a total duration of ~26 s. The emission is seen up to ~6 MeV.
  As observed by Konus-Wind, the burst had a fluence of 1.44(-0.23,+0.32)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+5.088 s, of 4.99(-1.51,+1.66)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+24.832 s) is best fit in the 20 keV - 6 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.99(-0.17,+0.21) and Ep = 528(-135,+239) keV (chi2 = 77/76 dof). Fitting by a GRB (Band) model yields alpha = -0.84(-0.33,+0.40), Ep = 374(-139,+403) keV, and beta = -2.0(-8.0,+0.3) (chi2 = 77/75 dof).
  The spectrum near the maximum count rate (measured from T0+0.256 to T0+8.448 s) is best fit in the 20 keV - 6 MeV range by a power law with exponential cutoff model with alpha = -0.85(-0.20,+0.23) and Ep = 544(-125,+200) keV (chi2 = 93/76 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.8 (chi2 = 93/75 dof).
  The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB180925_T52650/
  All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
• GCN Circular #23304
  V. Sharma and T. Khanam (IUCAA), V. Bhalerao (IIT-B), D. Bhattacharya (IUCAA), A. R. Rao (TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
  Analysis of AstroSat CZTI data showed the detection of a long GRB 180925A, which was also detected by Swift (Gropp J. D. et al., GCN 23268), Insight-HXMT/HE (Luo Q. et al., GCN 23275) and Konus-Wind (Kozlova A. et al., GCN 23291).
  The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks of emission with strongest peak at 14:37:33.5 UT. The measured peak count rate is 246 cts/s above the background in combined data of four quadrants, with a total of 2223 cts. The local mean background count rate was 506 cts/s. Using cumulative rates, we measure a T90 of around 34.7 s.
  It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range.
  CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC and PRL. The Indian Space Research Organisation funded, managed and facilitated the project.