Gamma-ray Burst 240419B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 19 Apr 24 12:25:31 UT
  NOTICE_TYPE:     Swift-BAT GRB Position
  TRIGGER_NUM:     1223072,   Seg_Num: 0
  GRB_RA:          325.877d {+21h 43m 30s} (J2000),
                   326.182d {+21h 44m 44s} (current),
                   325.248d {+21h 40m 59s} (1950)
  GRB_DEC:          +4.234d {+04d 14' 01"} (J2000),
                    +4.346d {+04d 20' 44"} (current),
                    +4.004d {+04d 00' 14"} (1950)
  GRB_ERROR:       3.00 [arcmin radius, statistical only]
  GRB_INTEN:       11136 [cnts]    Image_Peak=294 [image_cnts]
  TRIGGER_DUR:     4.096 [sec] 
  TRIGGER_INDEX:   475     E_range: 25-100 keV
  BKG_INTEN:       96464 [cnts]
  BKG_TIME:        44518.70 SOD {12:21:58.70} UT
  BKG_DUR:         40 [sec]
  GRB_DATE:        20419 TJD;   110 DOY;   24/04/19
  GRB_TIME:        44572.33 SOD {12:22:52.33} UT
  GRB_PHI:          11.85 [deg]
  GRB_THETA:        39.96 [deg]
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     8.48 [sigma]
  IMAGE_SIGNIF:    8.25 [sigma]
  MERIT_PARAMS:     +1  +0  +0  +2  +2  -1  +0  +0 -47  +0 
  SUN_POSTN:        27.85d {+01h 51m 25s}  +11.45d {+11d 26' 57"}
  SUN_DIST:         61.39 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      163.59d {+10h 54m 21s}  +10.30d {+10d 17' 53"}
  MOON_DIST:       157.31 [deg]
  MOON_ILLUM:      83 [%]
  GAL_COORDS:       60.21,-34.88 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      329.62, 16.87 [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:        This trigger occurred at longitude,latitude = 264.24,17.01 [deg].  
  

• red DSS finding chart ps-file
  
  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 19 Apr 24 12:26:16 UT
  NOTICE_TYPE:     Swift-XRT Position
  TRIGGER_NUM:     1223072,   Seg_Num: 0
  GRB_RA:          325.8940d {+21h 43m 34.56s} (J2000),
                   326.1997d {+21h 44m 47.92s} (current),
                   325.2648d {+21h 41m 03.55s} (1950)
  GRB_DEC:          +4.2349d {+04d 14' 05.6"} (J2000),
                    +4.3471d {+04d 20' 49.5"} (current),
                    +4.0052d {+04d 00' 18.8"} (1950)
  GRB_ERROR:       4.8 [arcsec radius, statistical plus systematic, 90% containment]
  GRB_INTEN:       7.01e-09 [erg/cm2/sec]
  GRB_SIGNIF:      13.67 [sigma]
  IMG_START_DATE:  20419 TJD;   110 DOY;   24/04/19
  IMG_START_TIME:  44720.78 SOD {12:25:20.78} UT,   148.4 [sec] since BAT Trigger Time
  TAM[0-3]:        327.68 237.15 261.58 243.79
  AMPLIFIER:       2
  WAVEFORM:        134
  SUN_POSTN:        27.85d {+01h 51m 25s}  +11.45d {+11d 26' 57"}
  SUN_DIST:         61.38 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      163.59d {+10h 54m 22s}  +10.30d {+10d 17' 43"}
  MOON_DIST:       157.32 [deg]
  MOON_ILLUM:      83 [%]
  GAL_COORDS:       60.22,-34.89 [deg] galactic lon,lat of the burst
  ECL_COORDS:      329.64, 16.87 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Coordinates.  
  COMMENTS:        The XRT position is 1.03 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:     Fri 19 Apr 24 12:27:13 UT
  NOTICE_TYPE:     Swift-BAT GRB Lightcurve
  TRIGGER_NUM:     1223072,   Seg_Num: 0
  GRB_RA:          325.877d {+21h 43m 30s} (J2000),
                   326.182d {+21h 44m 44s} (current),
                   325.248d {+21h 40m 59s} (1950)
  GRB_DEC:          +4.234d {+04d 14' 01"} (J2000),
                    +4.346d {+04d 20' 44"} (current),
                    +4.004d {+04d 00' 14"} (1950)
  GRB_DATE:        20419 TJD;   110 DOY;   24/04/19
  GRB_TIME:        44572.33 SOD {12:22:52.33} UT
  TRIGGER_INDEX:   475
  GRB_PHI:          11.85 [deg]
  GRB_THETA:        39.96 [deg]
  DELTA_TIME:      77.00 [sec]
  TRIGGER_DUR:     4.096 [sec] 
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     8.48 [sigma]
  IMAGE_SIGNIF:    8.25 [sigma]
  LC_URL:          sw01223072000msb.lc
  SUN_POSTN:        27.86d {+01h 51m 25s}  +11.45d {+11d 26' 58"}
  SUN_DIST:         61.39 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      163.60d {+10h 54m 24s}  +10.29d {+10d 17' 30"}
  MOON_DIST:       157.30 [deg]
  MOON_ILLUM:      83 [%]
  GAL_COORDS:       60.21,-34.88 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      329.62, 16.87 [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 = 264.24,17.01 [deg].  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 19 Apr 24 12:26:30 UT
  NOTICE_TYPE:     Swift-XRT Processed Image
  TRIGGER_NUM:     1223072,   Seg_Num: 0
  GRB_RA:          325.8940d {+21h 43m 34.5s} (J2000),
                   326.1997d {+21h 44m 47.9s} (current),
                   325.2648d {+21h 41m 03.5s} (1950)
  GRB_DEC:          +4.2349d {+04d 14' 05.6"} (J2000),
                    +4.3471d {+04d 20' 49.5"} (current),
                    +4.0052d {+04d 00' 18.8"} (1950)
  GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
  GRB_INTEN:       187 [cnts]
  IMG_START_DATE:  20419 TJD;   110 DOY;   24/04/19
  IMG_START_TIME:  44720.78 SOD {12:25:20.78} UT,   148.4 [sec] since BAT Trigger Time
  CENTROID_X:      264.20,  raw= 264  [pixels]
  CENTROID_Y:      301.36,  raw= 301  [pixels]
  ROLL:            79.28 [deg]
  GAIN:            4
  MODE:            3, Long Image mode
  WAVEFORM:        134
  EXPO_TIME:       2.50 [sec]
  GRB_POS_XRT_Y:   7.69
  GRB_POS_XRT_Z:   -101.82
  IMAGE_URL:       sw01223072000msxps_rw.img
  SUN_POSTN:        27.85d {+01h 51m 25s}  +11.45d {+11d 26' 58"}
  SUN_DIST:         61.38 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      163.59d {+10h 54m 22s}  +10.29d {+10d 17' 40"}
  MOON_DIST:       157.32 [deg]
  MOON_ILLUM:      83 [%]
  GAL_COORDS:       60.22,-34.89 [deg] galactic lon,lat of the burst
  ECL_COORDS:      329.64, 16.87 [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:     Fri 19 Apr 24 12:26:26 UT
  NOTICE_TYPE:     Swift-XRT Image
  TRIGGER_NUM:     1223072,   Seg_Num: 0
  GRB_RA:          325.8940d {+21h 43m 34.5s} (J2000),
                   326.1997d {+21h 44m 47.9s} (current),
                   325.2648d {+21h 41m 03.5s} (1950)
  GRB_DEC:          +4.2349d {+04d 14' 05.6"} (J2000),
                    +4.3471d {+04d 20' 49.5"} (current),
                    +4.0052d {+04d 00' 18.8"} (1950)
  GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
  GRB_INTEN:       187 [cnts]
  IMG_START_DATE:  20419 TJD;   110 DOY;   24/04/19
  IMG_START_TIME:  44720.78 SOD {12:25:20.78} UT,   148.4 [sec] since BAT Trigger Time
  CENTROID_X:      264.20,  raw= 264  [pixels]
  CENTROID_Y:      301.36,  raw= 301  [pixels]
  ROLL:            79.28 [deg]
  GAIN:            4
  MODE:            3, Long Image mode
  WAVEFORM:        134
  EXPO_TIME:       2.50 [sec]
  GRB_POS_XRT_Y:   7.69
  GRB_POS_XRT_Z:   -101.82
  IMAGE_URL:       sw01223072000msxps_rw.img
  SUN_POSTN:        27.85d {+01h 51m 25s}  +11.45d {+11d 26' 58"}
  SUN_DIST:         61.38 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      163.59d {+10h 54m 22s}  +10.29d {+10d 17' 40"}
  MOON_DIST:       157.32 [deg]
  MOON_ILLUM:      83 [%]
  GAL_COORDS:       60.22,-34.89 [deg] galactic lon,lat of the burst
  ECL_COORDS:      329.64, 16.87 [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:     Fri 19 Apr 24 12:28:43 UT
  NOTICE_TYPE:     Swift-UVOT Source List
  TRIGGER_NUM:     1223072,   Seg_Num: 0
  POINT_RA:        325.867d {+21h 43m 28s} (J2000)
  POINT_DEC:        +4.228d {+04d 13' 39"} (J2000)
  POINT_ROLL:      79.283d
  IMG_START_DATE:  20419 TJD;   110 DOY;   24/04/19
  IMG_START_TIME:  44730.93 SOD {12:25:30.93} UT,   158.6 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        4.236
  N_STARS:         48
  X_OFFSET:        648 [pixels]
  Y_OFFSET:        450 [pixels]
  X_MAX:           1607 [pixels]
  Y_MAX:           1409 [pixels]
  DET_THRESH:      17
  PHOTO_THRESH:    10
  SL_URL:          sw01223072000msufc0158.fits
  SUN_POSTN:        27.86d {+01h 51m 25s}  +11.45d {+11d 26' 60"}
  SUN_DIST:         61.41 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      163.61d {+10h 54m 26s}  +10.29d {+10d 17' 10"}
  MOON_DIST:       157.30 [deg]
  MOON_ILLUM:      83 [%]
  GAL_COORDS:       60.19,-34.88 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      329.61, 16.87 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Source List.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 19 Apr 24 12:28:59 UT
  NOTICE_TYPE:     Swift-UVOT Processed Source List
  TRIGGER_NUM:     1223072,   Seg_Num: 0
  POINT_RA:        325.867d {+21h 43m 28s} (J2000)
  POINT_DEC:        +4.228d {+04d 13' 39"} (J2000)
  POINT_ROLL:      79.283d
  IMG_START_DATE:  20419 TJD;   110 DOY;   24/04/19
  IMG_START_TIME:  44730.93 SOD {12:25:30.93} UT,   158.6 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        4.236
  N_STARS:         48
  X_OFFSET:        648 [pixels]
  Y_OFFSET:        450 [pixels]
  X_MAX:           1607 [pixels]
  Y_MAX:           1409 [pixels]
  DET_THRESH:      17
  PHOTO_THRESH:    10
  SL_URL:          sw01223072000msufc0158.fits
  SUN_POSTN:        27.86d {+01h 51m 26s}  +11.45d {+11d 26' 60"}
  SUN_DIST:         61.41 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      163.61d {+10h 54m 27s}  +10.29d {+10d 17' 06"}
  MOON_DIST:       157.29 [deg]
  MOON_ILLUM:      83 [%]
  GAL_COORDS:       60.19,-34.88 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      329.61, 16.87 [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 19 Apr 24 12:30:34 UT
  NOTICE_TYPE:     Swift-UVOT Image
  TRIGGER_NUM:     1223072,   Seg_Num: 0
  POINT_RA:        325.867d {+21h 43m 28s} (J2000)
  POINT_DEC:        +4.228d {+04d 13' 39"} (J2000)
  ROLL:            79.283d
  IMG_START_DATE:  20419 TJD;   110 DOY;   24/04/19
  IMG_START_TIME:  44730.93 SOD {12:25:30.93} UT,   158.6 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     735222364
  X_OFFSET:        968 [pixels]
  Y_OFFSET:        770 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       1128
  Y_GRB_POS:       930
  BINNING_INDEX:   1
  IM_URL:          sw01223072000msuni0192.fits
  SUN_POSTN:        27.86d {+01h 51m 26s}  +11.45d {+11d 27' 01"}
  SUN_DIST:         61.41 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      163.62d {+10h 54m 30s}  +10.28d {+10d 16' 45"}
  MOON_DIST:       157.29 [deg]
  MOON_ILLUM:      83 [%]
  GAL_COORDS:       60.19,-34.88 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      329.61, 16.87 [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:     Fri 19 Apr 24 12:30:47 UT
  NOTICE_TYPE:     Swift-UVOT Processed Image
  TRIGGER_NUM:     1223072,   Seg_Num: 0
  POINT_RA:        325.867d {+21h 43m 28s} (J2000)
  POINT_DEC:        +4.228d {+04d 13' 39"} (J2000)
  ROLL:            79.283d
  IMG_START_DATE:  20419 TJD;   110 DOY;   24/04/19
  IMG_START_TIME:  44730.93 SOD {12:25:30.93} UT,   158.6 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     735222364
  X_OFFSET:        968 [pixels]
  Y_OFFSET:        770 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       1128
  Y_GRB_POS:       930
  BINNING_INDEX:   1
  IM_URL:          sw01223072000msuni0192.fits
  SUN_POSTN:        27.86d {+01h 51m 26s}  +11.45d {+11d 27' 01"}
  SUN_DIST:         61.41 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      163.63d {+10h 54m 30s}  +10.28d {+10d 16' 43"}
  MOON_DIST:       157.29 [deg]
  MOON_ILLUM:      83 [%]
  GAL_COORDS:       60.19,-34.88 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      329.61, 16.87 [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:     Fri 19 Apr 24 12:36:03 UT
  NOTICE_TYPE:     Swift-UVOT Source List
  TRIGGER_NUM:     1223072,   Seg_Num: 0
  POINT_RA:        325.867d {+21h 43m 28s} (J2000)
  POINT_DEC:        +4.228d {+04d 13' 42"} (J2000)
  POINT_ROLL:      79.284d
  IMG_START_DATE:  20419 TJD;   110 DOY;   24/04/19
  IMG_START_TIME:  44888.97 SOD {12:28:08.97} UT,   316.6 [sec] since BAT Trigger Time
  FILTER:          7, U
  BKG_MEAN:        1.456
  N_STARS:         31
  X_OFFSET:        648 [pixels]
  Y_OFFSET:        450 [pixels]
  X_MAX:           1607 [pixels]
  Y_MAX:           1409 [pixels]
  DET_THRESH:      10
  PHOTO_THRESH:    5
  SL_URL:          sw01223072000msufc0316.fits
  SUN_POSTN:        27.86d {+01h 51m 27s}  +11.45d {+11d 27' 06"}
  SUN_DIST:         61.41 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      163.66d {+10h 54m 39s}  +10.26d {+10d 15' 32"}
  MOON_DIST:       157.27 [deg]
  MOON_ILLUM:      83 [%]
  GAL_COORDS:       60.19,-34.87 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      329.61, 16.87 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Source List.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 19 Apr 24 12:36:10 UT
  NOTICE_TYPE:     Swift-UVOT Processed Source List
  TRIGGER_NUM:     1223072,   Seg_Num: 0
  POINT_RA:        325.867d {+21h 43m 28s} (J2000)
  POINT_DEC:        +4.228d {+04d 13' 42"} (J2000)
  POINT_ROLL:      79.284d
  IMG_START_DATE:  20419 TJD;   110 DOY;   24/04/19
  IMG_START_TIME:  44888.97 SOD {12:28:08.97} UT,   316.6 [sec] since BAT Trigger Time
  FILTER:          7, U
  BKG_MEAN:        1.456
  N_STARS:         31
  X_OFFSET:        648 [pixels]
  Y_OFFSET:        450 [pixels]
  X_MAX:           1607 [pixels]
  Y_MAX:           1409 [pixels]
  DET_THRESH:      10
  PHOTO_THRESH:    5
  SL_URL:          sw01223072000msufc0316.fits
  SUN_POSTN:        27.86d {+01h 51m 27s}  +11.45d {+11d 27' 06"}
  SUN_DIST:         61.41 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      163.67d {+10h 54m 40s}  +10.26d {+10d 15' 31"}
  MOON_DIST:       157.27 [deg]
  MOON_ILLUM:      83 [%]
  GAL_COORDS:       60.19,-34.87 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      329.61, 16.87 [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 19 Apr 24 12:37:28 UT
  NOTICE_TYPE:     Swift-UVOT Image
  TRIGGER_NUM:     1223072,   Seg_Num: 0
  POINT_RA:        325.867d {+21h 43m 28s} (J2000)
  POINT_DEC:        +4.228d {+04d 13' 42"} (J2000)
  ROLL:            79.284d
  IMG_START_DATE:  20419 TJD;   110 DOY;   24/04/19
  IMG_START_TIME:  44888.97 SOD {12:28:08.97} UT,   316.6 [sec] since BAT Trigger Time
  FILTER:          7, U
  EXPOSURE_ID:     735222522
  X_OFFSET:        968 [pixels]
  Y_OFFSET:        770 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       1128
  Y_GRB_POS:       930
  BINNING_INDEX:   1
  IM_URL:          sw01223072000msuni0350.fits
  SUN_POSTN:        27.86d {+01h 51m 27s}  +11.45d {+11d 27' 07"}
  SUN_DIST:         61.41 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      163.67d {+10h 54m 42s}  +10.25d {+10d 15' 14"}
  MOON_DIST:       157.27 [deg]
  MOON_ILLUM:      83 [%]
  GAL_COORDS:       60.19,-34.87 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      329.61, 16.87 [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 Circular #36180
  S. Dichiara (PSU), J.D. Gropp (PSU), R. Gupta (NASA/GSFC), F. E. Marshall (NASA/GSFC), M. J. Moss (GSFC), P. T. O'Brien (U Leicester), M. H. Siegel (PSU) and M. A. Williams (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
  At 12:22:52 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 240419B (trigger=1223072). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 325.877, +4.234 which is

     RA(J2000) = 21h 43m 30s
     Dec(J2000) = +04d 14' 01"
  

  with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure lasted for ~40 seconds and returned to background before showing three bright pulses at ~100 seconds for a total duration of 160 seconds. The peak count rate was ~2049 counts/sec (15-350 keV), at ~119 sec after the trigger.
  The XRT began observing the field at 12:25:20.7 UT, 148.4 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 325.89615, 4.23548 which is equivalent to:

     RA(J2000)  = 21h 43m 35.08s
     Dec(J2000) = +04d 14' 07.7"
  

  with an uncertainty of 3.5 arcseconds (radius, 90% containment). This location is 68 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at https://www.swift.ac.uk/sper.
  A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 6.84 x 10^20 cm^-2 (Willingale et al. 2013).
  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 158 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 0.077.
  Burst Advocate for this burst is S. Dichiara (sbd5667 AT psu.edu). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/)
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 19 Apr 24 12:54:19 UT
  NOTICE_TYPE:     Swift-XRT Position UPDATE
  TRIGGER_NUM:     1223072,   Seg_Num: 0
  GRB_RA:          325.8963d {+21h 43m 35.11s} (J2000),
                   326.2020d {+21h 44m 48.47s} (current),
                   325.2671d {+21h 41m 04.10s} (1950)
  GRB_DEC:          +4.2354d {+04d 14' 07.4"} (J2000),
                    +4.3476d {+04d 20' 51.4"} (current),
                    +4.0057d {+04d 00' 20.6"} (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:  20419 TJD;   110 DOY;   24/04/19
  IMG_START_TIME:  45011.00 SOD {12:30:11.00} UT,   438.7 [sec] since BAT Trigger Time
  TAM[0-3]:        100.00 100.00 100.00 100.00
  AMPLIFIER:       1
  WAVEFORM:        31
  SUN_POSTN:        27.87d {+01h 51m 29s}  +11.46d {+11d 27' 22"}
  SUN_DIST:         61.39 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      163.80d {+10h 55m 12s}  +10.19d {+10d 11' 29"}
  MOON_DIST:       157.23 [deg]
  MOON_ILLUM:      83 [%]
  GAL_COORDS:       60.22,-34.89 [deg] galactic lon,lat of the burst
  ECL_COORDS:      329.64, 16.87 [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 NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 19 Apr 24 12:37:38 UT
  NOTICE_TYPE:     Swift-UVOT Processed Image
  TRIGGER_NUM:     1223072,   Seg_Num: 0
  POINT_RA:        325.867d {+21h 43m 28s} (J2000)
  POINT_DEC:        +4.228d {+04d 13' 42"} (J2000)
  ROLL:            79.284d
  IMG_START_DATE:  20419 TJD;   110 DOY;   24/04/19
  IMG_START_TIME:  44888.97 SOD {12:28:08.97} UT,   316.6 [sec] since BAT Trigger Time
  FILTER:          7, U
  EXPOSURE_ID:     735222522
  X_OFFSET:        968 [pixels]
  Y_OFFSET:        770 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       1128
  Y_GRB_POS:       930
  BINNING_INDEX:   1
  IM_URL:          sw01223072000msuni0350.fits
  SUN_POSTN:        27.86d {+01h 51m 27s}  +11.45d {+11d 27' 07"}
  SUN_DIST:         61.41 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      163.68d {+10h 54m 42s}  +10.25d {+10d 15' 11"}
  MOON_DIST:       157.27 [deg]
  MOON_ILLUM:      83 [%]
  GAL_COORDS:       60.19,-34.87 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      329.61, 16.87 [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 #36186
  J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
  Using 1231 s of XRT Photon Counting mode data and 3 UVOT images for GRB 240419B, 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 = 325.89679, +4.23479 which is equivalent to:

  RA (J2000): 21h 43m 35.23s
  Dec (J2000): +04d 14' 05.2"
  

  with an uncertainty of 2.5 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 #36188
  V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko, G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij (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. Gress, N.M. Budnev, O.Ershova (Irkutsk State University, API),
  L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory),
  A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
  V. Yurkov, A. Gabovich (Blagoveschensk Educational State University)
  MASTER-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) was pointed to the Swift GRB 240419B ( S. Dichiara et al., GCN 36180) errorbox 24752 sec after notice time and 24919 sec after trigger time at 2024-04-19 19:18:11 UT, with upper limit up to 15.6 mag. Observations started at twilight. The observations began at zenith distance = 69 deg. The sun altitude is -11.0 deg.
  The galactic latitude b = -35 deg., longitude l = 61 deg.
  Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2427564
  We obtain a following upper limits.

  Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
  _________|_____________________|_____|_______|______|________
  
     25009 |         MASTER-Amur |   C |   180 | 15.1 |        
     25009 |         MASTER-Amur |   C |   180 | 15.6 |        
  

  Filter C is a clear (unfiltred) band.
  The observation and reduction will continue. The message may be cited.
• GCN Circular #36191
  Daniele B. Malesani (DAWN/NBI and Radboud Univ.) and David Jones (NOT) report on behalf of a larger collaboration.
  We observed the field of GRB 240419B (Dichiara et al., GCN 36180) with the Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. Observations were carried out straddling the morning twilight, at airmass ~2, and the seeing was about 1.7".
  An object consistent with the X-ray localization error circle (Osborne et al., GCN 36186) is detected in our images. Its coordinates are (J2000):

  RA = 21:43:35.289
  Dec = +04:14:05.30
  

  Calibrating against nearby point-like sources from the Pan-STARRS catalog, we measure the following AB magnitudes:

  r = 22.01 +- 0.10  (Apr 20.214 UT, or 0.698 days after the trigger);
  z = 20.81 +- 0.19  (Apr 20.222 UT, or 0.701 days after the trigger).
  

  This object is not visible in the Legacy Survey images, which are deeper than ours, and we thus conclude that it is the optical afterglow of GRB 240419B. We note however the presence of a fainter (r ~ 23.2), distinct source visible in the Legacy Survey, approximately 2.5" to the west of the afterglow. Given the relatively large offset, the relation of this object with the GRB is unclear.
• GCN Circular #36192
  J.P. Osborne (U. Leicester), V. D'Elia (SSDC & INAF-OAR), B. Sbarufatti (INAF-OAB), C. Salvaggio (INAF-OAB), J. D. Gropp (PSU), S. Dichiara (PSU), J.A. Kennea (PSU), K.L. Page (U. Leicester) and P.A. Evans report on behalf of the Swift-XRT team:
  We have analysed 7.5 ks of XRT data for GRB 240419B, from 141 s to 52.1 ks after the BAT trigger. The data comprise 282 s in Windowed Timing (WT) mode (the first 6 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode.
  The late-time light curve (from T0+4.6 ks) can be modelled with a power-law decay with a decay index of alpha=1.02 (+0.12, -0.11).
  A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.95 (+/-0.05). The best-fitting absorption column is 1.21 (+0.16, -0.15) x 10^21 cm^-2, in excess of the Galactic value of 6.8 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.08 (+0.20, -0.19) and a best-fitting absorption column of 1.2 (+/-0.5) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.2 x 10^-11 (4.2 x 10^-11) erg cm^-2 count^-1.
  A summary of the PC-mode spectrum is thus:

  Total column:	     1.2 (+/-0.5) x 10^21 cm^-2
  Galactic foreground: 6.8 x 10^20 cm^-2
  Excess significance: 1.7 sigma
  Photon index:	     2.08 (+0.20, -0.19)
  

  If the light curve continues to decay with a power-law decay index of 1.02, the count rate at T+24 hours will be 10.0 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.2 x 10^-13 (4.2 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/01223072.
  This circular is an official product of the Swift-XRT team.
• GCN Circular #36197
  S. P. R. Shilling (Lancaster U.), S. R. Oates (Lancaster U.), A. A. Breeveld (UCL-MSSL), N. P. M. Kuin (UCL-MSSL) and S. Dichiara (PSU) report on behalf of the Swift/UVOT team:
  The Swift/UVOT began settled observations of the field of GRB 240419B 159 s after the BAT trigger (Dichiara et al., GCN Circ. 36180). No optical afterglow consistent with either the enhanced XRT position (Osborne et al., GCN Circ. 36186) or the NOT optical afterglow position (Malesani et al., GCN Circ. 36191) 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) exposures and subsequent exposures are:

  Filter         T_start(s)   T_stop(s)      Exp(s)         Mag
  
  white_FC           159          308          147         >20.3
  u_FC               317          567          246         >19.5
  white              159          790          186         >20.4
  v                  647          667           19         >17.3
  b                  572          765           39         >18.6
  u                  317          741          265         >19.5
  w1                 696          716           19         >17.5
  m2                 672          691           19         >17.2
  w2                 623          643           19         >17.6
  

  The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.077 in the direction of the burst (Schlegel et al. 1998).
• GCN Circular #36227
  N. Higuchi, Y. Kubo, S. Joshima, H. Hagio, I. Takahashi, M. Sasada, M. Niwano, S. Hayatsu, H. Seki, Y. Yatsu and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
  We observed the field of GRB 240419B (Dichiara et al., GCN 36180) with the optical three-color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50-cm telescope Akeno.
  The observation started at 2024-04-19 17:46:23 UT (5.4 hrs after the Swift/BAT trigger). We stacked the images with good conditions. We did not detect any uncatalogued sources within the enhanced Swift/XRT error region (Osborne et al., GCN 36186), despite the detection report of Daniele et al., (GCN 36191). We obtained the 5-sigma limits of the stacked images as follows.

  T0+[hrs] | MID-UT | T-EXP[sec] | 5-sigma limits
  ------------------------------------------------------------------------------------------------
  6.4 | 2024-04-19 18:44:10.13 | 3660 | g'>18.6, Rc>18.8, Ic>18.4
  ------------------------------------------------------------------------------------------------
  T0+ : Elapsed time after the trigger
  T-EXP: Total Exposure time
  

  We used the PS1 catalog for flux calibration. The catalog magnitudes in PS1 g, r and i bands were converted to our g', Rc and Ic band magnitudes following Tonry et al. (2012), Table 6. The magnitudes are expressed in the AB system. The images were processed in real-time through the MITSuME GPU reduction pipeline (Niwano et al. 2021, PASJ; https://github.com/MNiwano/Eclaire).
• GCN Circular #36292
  T. Sakamoto (AGU), S. D. Barthelmy (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), M. J. Moss (GSFC), D. M. Palmer (LANL), T. Parsotan (GSFC),(i.e. the Swift-BAT team):
  Using the data set from T-61 to T+242 sec from the recent telemetry downlink, we report further analysis of BAT GRB 240419B (trigger #1223072) (Dichiara, et al., GCN Circ. 36180). The BAT ground-calculated position is RA, Dec = 325.853, 4.299 deg which is

     RA(J2000)  =  21h 43m 24.7s
     Dec(J2000) = +04d 17' 58.2"
  

  with an uncertainty of 3.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 43%.
  The BAT light curve shows a complex structure with a duration of ~ 150 sec. T90 (15-350 keV) is 132.16 +- 26.29 sec (estimated error including systematics).
  The time-averaged spectrum from T-3.3 to T+159.5 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.92 +- 0.09. The fluence in the 15-150 keV band is 4.1 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+116.36 sec in the 15-150 keV band is 2.4 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
  The results of the batgrbproduct analysis are available at https://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1223072