Gamma-ray Burst 240516A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Thu 16 May 24 03:36:47 UT
  NOTICE_TYPE:     Swift-BAT GRB Position
  TRIGGER_NUM:     1228797,   Seg_Num: 0
  GRB_RA:          212.770d {+14h 11m 05s} (J2000),
                   213.231d {+14h 12m 56s} (current),
                   211.833d {+14h 07m 20s} (1950)
  GRB_DEC:         -63.505d {-63d 30' 17"} (J2000),
                   -63.619d {-63d 37' 06"} (current),
                   -63.270d {-63d 16' 09"} (1950)
  GRB_ERROR:       3.00 [arcmin radius, statistical only]
  GRB_INTEN:       2498 [cnts]    Image_Peak=116 [image_cnts]
  TRIGGER_DUR:     1.024 [sec] 
  TRIGGER_INDEX:   155     E_range: 50-350 keV
  BKG_INTEN:       13932 [cnts]
  BKG_TIME:        12974.54 SOD {03:36:14.54} UT
  BKG_DUR:         8 [sec]
  GRB_DATE:        20446 TJD;   137 DOY;   24/05/16
  GRB_TIME:        12988.30 SOD {03:36:28.30} UT
  GRB_PHI:          -3.34 [deg]
  GRB_THETA:        43.24 [deg]
  SOLN_STATUS:     0x20000003
  RATE_SIGNIF:     15.81 [sigma]
  IMAGE_SIGNIF:    7.02 [sigma]
  MERIT_PARAMS:     +1  +0  +0  +0  +3  -3  +0  +1 +68  +0 
  SUN_POSTN:        53.45d {+03h 33m 47s}  +19.20d {+19d 11' 54"}
  SUN_DIST:        133.50 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
  MOON_POSTN:      156.34d {+10h 25m 21s}  +13.64d {+13d 38' 23"}
  MOON_DIST:        88.59 [deg]
  MOON_ILLUM:      56 [%]
  GAL_COORDS:      311.68, -1.99 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      237.00,-46.47 [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 = 295.86,2.25 [deg].  
  COMMENTS:           
  COMMENTS:        NOTE: This BAT event is temporally(4.0<100sec) coincident with the FERMI_GBM event (trignum=737523389).  
  

• red DSS finding chart ps-file
  
  
• GCN NOTICE
  

  TITLE:           GCN/FERMI NOTICE
  NOTICE_DATE:     Thu 16 May 24 03:36:54 UT
  NOTICE_TYPE:     Fermi-GBM Flight Position
  RECORD_NUM:      47
  TRIGGER_NUM:     737523389
  GRB_RA:          210.333d {+14h 01m 20s} (J2000),
                   210.776d {+14h 03m 06s} (current),
                   209.433d {+13h 57m 44s} (1950)
  GRB_DEC:         -62.000d {-62d 00' 00"} (J2000),
                   -62.117d {-62d 07' 00"} (current),
                   -61.759d {-61d 45' 30"} (1950)
  GRB_ERROR:       14.10 [deg radius, statistical plus systematic]
  GRB_INTEN:       115 [cnts/sec]
  DATA_SIGNIF:     6.30 [sigma]
  INTEG_TIME:      2.048 [sec]
  GRB_DATE:        20446 TJD;   137 DOY;   24/05/16
  GRB_TIME:        12984.84 SOD {03:36:24.84} UT
  GRB_PHI:         122.00 [deg]
  GRB_THETA:        45.00 [deg]
  DATA_TIME_SCALE: 2.0480 [sec]
  HARD_RATIO:      0.48
  LOC_ALGORITHM:   3 (version number of)
  MOST_LIKELY:      51%  GRB
  2nd_MOST_LIKELY:  46%  Distant Particles
  DETECTORS:       0,0,0, 0,0,0, 0,0,0, 1,1,0, 0,0,
  SUN_POSTN:        53.45d {+03h 33m 47s}  +19.20d {+19d 11' 55"}
  SUN_DIST:        134.28 [deg]   Sun_angle= -10.5 [hr] (East of Sun)
  MOON_POSTN:      156.34d {+10h 25m 21s}  +13.64d {+13d 38' 21"}
  MOON_DIST:        86.80 [deg]
  MOON_ILLUM:      56 [%]
  GAL_COORDS:      311.04, -0.23 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      234.53,-45.71 [deg] ecliptic lon,lat of the burst (or transient)
  LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240516150/quicklook/glg_lc_medres34_bn240516150.gif
  COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
  COMMENTS:        This trigger occurred at longitude,latitude = 249.83,24.42 [deg].  
  COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger. 
  COMMENTS:           
  COMMENTS:        NOTE: This GBM event is temporally(4.0<100sec) coincident with the SWIFT_BAT event (trignum=1228797).  
  

• GCN NOTICE
  

  TITLE:           GCN/FERMI NOTICE
  NOTICE_DATE:     Thu 16 May 24 03:37:04 UT
  NOTICE_TYPE:     Fermi-GBM Flight Position
  RECORD_NUM:      58
  TRIGGER_NUM:     737523389
  GRB_RA:          202.933d {+13h 31m 44s} (J2000),
                   203.364d {+13h 33m 27s} (current),
                   202.059d {+13h 28m 14s} (1950)
  GRB_DEC:         -65.617d {-65d 37' 00"} (J2000),
                   -65.741d {-65d 44' 28"} (current),
                   -65.359d {-65d 21' 33"} (1950)
  GRB_ERROR:       11.05 [deg radius, statistical plus systematic]
  GRB_INTEN:       131 [cnts/sec]
  DATA_SIGNIF:     11.40 [sigma]
  INTEG_TIME:      4.096 [sec]
  GRB_DATE:        20446 TJD;   137 DOY;   24/05/16
  GRB_TIME:        12984.84 SOD {03:36:24.84} UT
  GRB_PHI:         115.00 [deg]
  GRB_THETA:        45.00 [deg]
  DATA_TIME_SCALE: 4.0960 [sec]
  HARD_RATIO:      0.42
  LOC_ALGORITHM:   3 (version number of)
  MOST_LIKELY:      51%  Distant Particles
  2nd_MOST_LIKELY:  46%  GRB
  DETECTORS:       0,0,0, 0,0,0, 0,0,0, 1,1,0, 0,0,
  SUN_POSTN:        53.45d {+03h 33m 47s}  +19.20d {+19d 11' 55"}
  SUN_DIST:        129.46 [deg]   Sun_angle= -10.0 [hr] (East of Sun)
  MOON_POSTN:      156.34d {+10h 25m 21s}  +13.64d {+13d 38' 19"}
  MOON_DIST:        86.72 [deg]
  MOON_ILLUM:      56 [%]
  GAL_COORDS:      307.08, -3.07 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      233.29,-50.50 [deg] ecliptic lon,lat of the burst (or transient)
  LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240516150/quicklook/glg_lc_medres34_bn240516150.gif
  COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
  COMMENTS:        This trigger occurred at longitude,latitude = 249.83,24.42 [deg].  
  COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger. 
  COMMENTS:           
  COMMENTS:        NOTE: This GBM event is temporally(4.0<100sec) coincident with the SWIFT_BAT event (trignum=1228797).  
  
  

• GCN NOTICE
  

  TITLE:           GCN/FERMI NOTICE
  NOTICE_DATE:     Thu 16 May 24 04:50:37 UT
  NOTICE_TYPE:     Fermi-GBM Final Position
  RECORD_NUM:      0
  TRIGGER_NUM:     737523389
  GRB_RA:          209.320d {+13h 57m 17s} (J2000),
                   209.739d {+13h 58m 57s} (current),
                   208.466d {+13h 53m 52s} (1950)
  GRB_DEC:         -57.960d {-57d 57' 35"} (J2000),
                   -58.078d {-58d 04' 40"} (current),
                   -57.716d {-57d 42' 57"} (1950)
  GRB_ERROR:       4.61 [deg radius, statistical only]
  GRB_DATE:        20446 TJD;   137 DOY;   24/05/16
  GRB_TIME:        12984.84 SOD {03:36:24.84} UT
  GRB_PHI:         126.37 [deg]
  GRB_THETA:        42.25 [deg]
  E_RANGE:         50.000 - 300.000 [keV]
  LOC_ALGORITHM:   415 (Gnd S/W Version number)
  SUN_POSTN:        53.50d {+03h 33m 59s}  +19.21d {+19d 12' 37"}
  SUN_DIST:        137.42 [deg]   Sun_angle= -10.4 [hr] (East of Sun)
  MOON_POSTN:      156.90d {+10h 27m 36s}  +13.38d {+13d 22' 47"}
  MOON_DIST:        83.43 [deg]
  MOON_ILLUM:      57 [%]
  GAL_COORDS:      311.60,  3.80 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      231.21,-42.41 [deg] ecliptic lon,lat of the burst (or transient)
  LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240516150/quicklook/glg_lc_medres34_bn240516150.gif
  LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240516150/quicklook/glg_locplot_all_bn240516150.png
  COMMENTS:        Fermi-GBM Final Position.  
  COMMENTS:        This Notice was ground-generated -- not flight-generated.  
  COMMENTS:        The LC_URL file should be available by the time this FINAL notice is produced.  
  COMMENTS:        This notice has human-in-the-loop processing.  
  COMMENTS:           
  COMMENTS:        NOTE: This GBM event is temporally(4.0<100sec) coincident with the SWIFT_BAT event (trignum=1228797).  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Thu 16 May 24 03:39:28 UT
  NOTICE_TYPE:     Swift-XRT Processed Image
  TRIGGER_NUM:     1228797,   Seg_Num: 0
  GRB_RA:          212.8071d {+14h 11m 13.7s} (J2000),
                   213.2680d {+14h 13m 04.3s} (current),
                   211.8696d {+14h 07m 28.7s} (1950)
  GRB_DEC:         -63.4878d {-63d 29' 16.0"} (J2000),
                   -63.6015d {-63d 36' 05.5"} (current),
                   -63.2526d {-63d 15' 09.2"} (1950)
  GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
  GRB_INTEN:       23 [cnts]
  IMG_START_DATE:  20446 TJD;   137 DOY;   24/05/16
  IMG_START_TIME:  13130.43 SOD {03:38:50.43} UT,   142.1 [sec] since BAT Trigger Time
  CENTROID_X:      351.20,  raw= 351  [pixels]
  CENTROID_Y:      308.69,  raw= 309  [pixels]
  ROLL:            207.42 [deg]
  GAIN:            1
  MODE:            3, Long Image mode
  WAVEFORM:        134
  EXPO_TIME:       2.50 [sec]
  GRB_POS_XRT_Y:   24.96
  GRB_POS_XRT_Z:   103.26
  IMAGE_URL:       sw01228797000msxps_rw.img
  SUN_POSTN:        53.45d {+03h 33m 47s}  +19.20d {+19d 11' 56"}
  SUN_DIST:        133.52 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
  MOON_POSTN:      156.36d {+10h 25m 26s}  +13.63d {+13d 37' 49"}
  MOON_DIST:        88.58 [deg]
  MOON_ILLUM:      56 [%]
  GAL_COORDS:      311.70, -1.98 [deg] galactic lon,lat of the burst
  ECL_COORDS:      237.00,-46.45 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Processed Image.  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Thu 16 May 24 03:39:26 UT
  NOTICE_TYPE:     Swift-XRT Image
  TRIGGER_NUM:     1228797,   Seg_Num: 0
  GRB_RA:          212.8071d {+14h 11m 13.7s} (J2000),
                   213.2680d {+14h 13m 04.3s} (current),
                   211.8696d {+14h 07m 28.7s} (1950)
  GRB_DEC:         -63.4878d {-63d 29' 16.0"} (J2000),
                   -63.6015d {-63d 36' 05.5"} (current),
                   -63.2526d {-63d 15' 09.2"} (1950)
  GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
  GRB_INTEN:       23 [cnts]
  IMG_START_DATE:  20446 TJD;   137 DOY;   24/05/16
  IMG_START_TIME:  13130.43 SOD {03:38:50.43} UT,   142.1 [sec] since BAT Trigger Time
  CENTROID_X:      351.20,  raw= 351  [pixels]
  CENTROID_Y:      308.69,  raw= 309  [pixels]
  ROLL:            207.42 [deg]
  GAIN:            1
  MODE:            3, Long Image mode
  WAVEFORM:        134
  EXPO_TIME:       2.50 [sec]
  GRB_POS_XRT_Y:   24.96
  GRB_POS_XRT_Z:   103.26
  IMAGE_URL:       sw01228797000msxps_rw.img
  SUN_POSTN:        53.45d {+03h 33m 47s}  +19.20d {+19d 11' 56"}
  SUN_DIST:        133.52 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
  MOON_POSTN:      156.36d {+10h 25m 26s}  +13.63d {+13d 37' 49"}
  MOON_DIST:        88.58 [deg]
  MOON_ILLUM:      56 [%]
  GAL_COORDS:      311.70, -1.98 [deg] galactic lon,lat of the burst
  ECL_COORDS:      237.00,-46.45 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Image.  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Thu 16 May 24 03:40:08 UT
  NOTICE_TYPE:     Swift-UVOT Source List
  TRIGGER_NUM:     1228797,   Seg_Num: 0
  POINT_RA:        212.764d {+14h 11m 03s} (J2000)
  POINT_DEC:       -63.510d {-63d 30' 34"} (J2000)
  POINT_ROLL:      207.420d
  IMG_START_DATE:  20446 TJD;   137 DOY;   24/05/16
  IMG_START_TIME:  13138.98 SOD {03:38:58.98} UT,   150.7 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        0.065
  N_STARS:         137
  X_OFFSET:        440 [pixels]
  Y_OFFSET:        576 [pixels]
  X_MAX:           1399 [pixels]
  Y_MAX:           1535 [pixels]
  DET_THRESH:      3
  PHOTO_THRESH:    2
  SL_URL:          sw01228797000msufc0150.fits
  SUN_POSTN:        53.45d {+03h 33m 47s}  +19.20d {+19d 11' 56"}
  SUN_DIST:        133.50 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
  MOON_POSTN:      156.36d {+10h 25m 27s}  +13.63d {+13d 37' 40"}
  MOON_DIST:        88.57 [deg]
  MOON_ILLUM:      56 [%]
  GAL_COORDS:      311.67, -2.00 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      237.00,-46.48 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Source List.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Thu 16 May 24 03:39:16 UT
  NOTICE_TYPE:     Swift-XRT Position
  TRIGGER_NUM:     1228797,   Seg_Num: 0
  GRB_RA:          212.8071d {+14h 11m 13.70s} (J2000),
                   213.2680d {+14h 13m 04.32s} (current),
                   211.8696d {+14h 07m 28.70s} (1950)
  GRB_DEC:         -63.4878d {-63d 29' 16.0"} (J2000),
                   -63.6015d {-63d 36' 05.5"} (current),
                   -63.2526d {-63d 15' 09.2"} (1950)
  GRB_ERROR:       6.1 [arcsec radius, statistical plus systematic, 90% containment]
  GRB_INTEN:       6.10e-10 [erg/cm2/sec]
  GRB_SIGNIF:      4.79 [sigma]
  IMG_START_DATE:  20446 TJD;   137 DOY;   24/05/16
  IMG_START_TIME:  13130.43 SOD {03:38:50.43} UT,   142.1 [sec] since BAT Trigger Time
  TAM[0-3]:        327.65 237.17 261.55 243.90
  AMPLIFIER:       2
  WAVEFORM:        134
  SUN_POSTN:        53.45d {+03h 33m 47s}  +19.20d {+19d 11' 56"}
  SUN_DIST:        133.52 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
  MOON_POSTN:      156.36d {+10h 25m 25s}  +13.63d {+13d 37' 51"}
  MOON_DIST:        88.58 [deg]
  MOON_ILLUM:      56 [%]
  GAL_COORDS:      311.70, -1.98 [deg] galactic lon,lat of the burst
  ECL_COORDS:      237.00,-46.45 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Coordinates.  
  COMMENTS:        The XRT position is 1.42 arcmin from the BAT position.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Thu 16 May 24 03:40:23 UT
  NOTICE_TYPE:     Swift-UVOT Processed Source List
  TRIGGER_NUM:     1228797,   Seg_Num: 0
  POINT_RA:        212.764d {+14h 11m 03s} (J2000)
  POINT_DEC:       -63.510d {-63d 30' 34"} (J2000)
  POINT_ROLL:      207.420d
  IMG_START_DATE:  20446 TJD;   137 DOY;   24/05/16
  IMG_START_TIME:  13138.98 SOD {03:38:58.98} UT,   150.7 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        0.065
  N_STARS:         137
  X_OFFSET:        440 [pixels]
  Y_OFFSET:        576 [pixels]
  X_MAX:           1399 [pixels]
  Y_MAX:           1535 [pixels]
  DET_THRESH:      3
  PHOTO_THRESH:    2
  SL_URL:          sw01228797000msufc0150.fits
  SUN_POSTN:        53.45d {+03h 33m 47s}  +19.20d {+19d 11' 57"}
  SUN_DIST:        133.50 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
  MOON_POSTN:      156.36d {+10h 25m 27s}  +13.63d {+13d 37' 37"}
  MOON_DIST:        88.57 [deg]
  MOON_ILLUM:      56 [%]
  GAL_COORDS:      311.67, -2.00 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      237.00,-46.48 [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:     Thu 16 May 24 03:41:14 UT
  NOTICE_TYPE:     Swift-UVOT Image
  TRIGGER_NUM:     1228797,   Seg_Num: 0
  POINT_RA:        212.764d {+14h 11m 03s} (J2000)
  POINT_DEC:       -63.510d {-63d 30' 34"} (J2000)
  ROLL:            207.420d
  IMG_START_DATE:  20446 TJD;   137 DOY;   24/05/16
  IMG_START_TIME:  13138.98 SOD {03:38:58.98} UT,   150.7 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     737523572
  X_OFFSET:        594 [pixels]
  Y_OFFSET:        930 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       754
  Y_GRB_POS:       1090
  BINNING_INDEX:   1
  IM_URL:          sw01228797000msuni0184.fits
  SUN_POSTN:        53.45d {+03h 33m 48s}  +19.20d {+19d 11' 57"}
  SUN_DIST:        133.50 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
  MOON_POSTN:      156.37d {+10h 25m 29s}  +13.62d {+13d 37' 26"}
  MOON_DIST:        88.56 [deg]
  MOON_ILLUM:      56 [%]
  GAL_COORDS:      311.67, -2.00 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      237.00,-46.48 [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:     Thu 16 May 24 03:41:32 UT
  NOTICE_TYPE:     Swift-BAT GRB Lightcurve
  TRIGGER_NUM:     1228797,   Seg_Num: 0
  GRB_RA:          212.770d {+14h 11m 05s} (J2000),
                   213.231d {+14h 12m 56s} (current),
                   211.833d {+14h 07m 20s} (1950)
  GRB_DEC:         -63.505d {-63d 30' 17"} (J2000),
                   -63.619d {-63d 37' 06"} (current),
                   -63.270d {-63d 16' 09"} (1950)
  GRB_DATE:        20446 TJD;   137 DOY;   24/05/16
  GRB_TIME:        12988.30 SOD {03:36:28.30} UT
  TRIGGER_INDEX:   155
  GRB_PHI:          -3.34 [deg]
  GRB_THETA:        43.24 [deg]
  DELTA_TIME:      64.00 [sec]
  TRIGGER_DUR:     1.024 [sec] 
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     15.81 [sigma]
  IMAGE_SIGNIF:    7.02 [sigma]
  LC_URL:          sw01228797000msb.lc
  SUN_POSTN:        53.45d {+03h 33m 48s}  +19.20d {+19d 11' 57"}
  SUN_DIST:        133.50 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
  MOON_POSTN:      156.37d {+10h 25m 29s}  +13.62d {+13d 37' 23"}
  MOON_DIST:        88.56 [deg]
  MOON_ILLUM:      56 [%]
  GAL_COORDS:      311.68, -1.99 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      237.00,-46.47 [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 = 295.86,2.25 [deg].  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Thu 16 May 24 03:41:29 UT
  NOTICE_TYPE:     Swift-UVOT Processed Image
  TRIGGER_NUM:     1228797,   Seg_Num: 0
  POINT_RA:        212.764d {+14h 11m 03s} (J2000)
  POINT_DEC:       -63.510d {-63d 30' 34"} (J2000)
  ROLL:            207.420d
  IMG_START_DATE:  20446 TJD;   137 DOY;   24/05/16
  IMG_START_TIME:  13138.98 SOD {03:38:58.98} UT,   150.7 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     737523572
  X_OFFSET:        594 [pixels]
  Y_OFFSET:        930 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       754
  Y_GRB_POS:       1090
  BINNING_INDEX:   1
  IM_URL:          sw01228797000msuni0184.fits
  SUN_POSTN:        53.45d {+03h 33m 48s}  +19.20d {+19d 11' 57"}
  SUN_DIST:        133.50 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
  MOON_POSTN:      156.37d {+10h 25m 29s}  +13.62d {+13d 37' 23"}
  MOON_DIST:        88.56 [deg]
  MOON_ILLUM:      56 [%]
  GAL_COORDS:      311.67, -2.00 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      237.00,-46.48 [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 #36492
  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-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 Swift GRB240516.15 (trigger No 1228797,14h 11m 04.80s , -63d 30m 18.0s, R=0.05) errorbox 18 sec after notice time and 45 sec after trigger time at 2024-05-16 03:37:13 UT, with upper limit up to 17.3 mag. The observations began at zenith distance = 65 deg. The sun altitude is -21.9 deg.
  The galactic latitude b = -2 deg., longitude l = 312 deg.
  Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2458686
  We obtain a following upper limits.

  Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
  _________|_____________________|_____|_______|______|________
  
        50 |         MASTER-SAAO | P\\ |    10 | 16.5 |        
        50 |         MASTER-SAAO |  P/ |    10 | 16.4 |        
        68 |         MASTER-SAAO | P\\ |    10 | 16.5 |        
        68 |         MASTER-SAAO |  P/ |    10 | 16.3 |        
        93 |         MASTER-SAAO | P\\ |    20 | 16.8 |        
        93 |         MASTER-SAAO |  P/ |    20 | 16.6 |        
       122 |         MASTER-SAAO | P\\ |    20 | 16.8 |        
       122 |         MASTER-SAAO |  P/ |    20 | 16.5 |        
       154 |         MASTER-SAAO | P\\ |    30 | 17.1 |        
       154 |         MASTER-SAAO |  P/ |    30 | 16.8 |        
       192 |         MASTER-SAAO | P\\ |    30 | 16.9 |        
       192 |         MASTER-SAAO |  P/ |    30 | 16.7 |        
       236 |         MASTER-SAAO | P\\ |    40 | 17.2 |        
       236 |         MASTER-SAAO |  P/ |    40 | 16.8 |        
       289 |         MASTER-SAAO | P\\ |    50 | 17.3 |        
  

  The observation and reduction will continue. The message may be cited.
• GCN Circular #36493
  T. M. Parsotan (GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL) and A. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift Observatory Team:
  At 03:36:28 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 240516A (trigger=1228797). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 212.770, -63.505 which is

     RA(J2000) = 14h 11m 05s
     Dec(J2000) = -63d 30' 17"
  

  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 20 sec. The peak count rate was ~1400 counts/sec (15-350 keV), at ~1 sec after the trigger.
  The XRT began observing the field at 03:38:50.4 UT, 142.1 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 212.8071, -63.4878 which is equivalent to:

     RA(J2000)  = 14h 11m 13.70s
     Dec(J2000) = -63d 29' 16.1"
  

  with an uncertainty of 6.1 arcseconds (radius, 90% containment). This location is 85 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy.
  UVOT took a finding chart exposure of 2 seconds with the White filter starting 150 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. Because of the density of catalogued stars, further analysis is required to report an upper limit for any afterglow in the sub-image. Results from the list of sources generated on-board are not available at this time. No correction has been made for the large, but uncertain, extinction expected.
  Burst Advocate for this burst is T. M. Parsotan (parsotat AT umbc.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:     Thu 16 May 24 04:05:39 UT
  NOTICE_TYPE:     Swift-UVOT Source List
  TRIGGER_NUM:     1228797,   Seg_Num: 0
  POINT_RA:        212.764d {+14h 11m 03s} (J2000)
  POINT_DEC:       -63.510d {-63d 30' 34"} (J2000)
  POINT_ROLL:      207.417d
  IMG_START_DATE:  20446 TJD;   137 DOY;   24/05/16
  IMG_START_TIME:  14588.44 SOD {04:03:08.44} UT,   1600.1 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        2.952
  N_STARS:         190
  X_OFFSET:        274 [pixels]
  Y_OFFSET:        610 [pixels]
  X_MAX:           1233 [pixels]
  Y_MAX:           1569 [pixels]
  DET_THRESH:      14
  PHOTO_THRESH:    8
  SL_URL:          sw01228797000msufc1600.fits
  SUN_POSTN:        53.47d {+03h 33m 52s}  +19.20d {+19d 12' 11"}
  SUN_DIST:        133.50 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
  MOON_POSTN:      156.56d {+10h 26m 14s}  +13.54d {+13d 32' 17"}
  MOON_DIST:        88.42 [deg]
  MOON_ILLUM:      57 [%]
  GAL_COORDS:      311.67, -2.00 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      237.00,-46.48 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Source List.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Thu 16 May 24 04:05:58 UT
  NOTICE_TYPE:     Swift-UVOT Processed Source List
  TRIGGER_NUM:     1228797,   Seg_Num: 0
  POINT_RA:        212.764d {+14h 11m 03s} (J2000)
  POINT_DEC:       -63.510d {-63d 30' 34"} (J2000)
  POINT_ROLL:      207.417d
  IMG_START_DATE:  20446 TJD;   137 DOY;   24/05/16
  IMG_START_TIME:  14588.44 SOD {04:03:08.44} UT,   1600.1 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        2.952
  N_STARS:         190
  X_OFFSET:        274 [pixels]
  Y_OFFSET:        610 [pixels]
  X_MAX:           1233 [pixels]
  Y_MAX:           1569 [pixels]
  DET_THRESH:      14
  PHOTO_THRESH:    8
  SL_URL:          sw01228797000msufc1600.fits
  SUN_POSTN:        53.47d {+03h 33m 52s}  +19.20d {+19d 12' 11"}
  SUN_DIST:        133.50 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
  MOON_POSTN:      156.56d {+10h 26m 14s}  +13.54d {+13d 32' 13"}
  MOON_DIST:        88.42 [deg]
  MOON_ILLUM:      57 [%]
  GAL_COORDS:      311.67, -2.00 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      237.00,-46.48 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Processed Source List.  
  COMMENTS:        All 4 attachments are included.  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Thu 16 May 24 04:06:36 UT
  NOTICE_TYPE:     Swift-UVOT Image
  TRIGGER_NUM:     1228797,   Seg_Num: 0
  POINT_RA:        212.764d {+14h 11m 03s} (J2000)
  POINT_DEC:       -63.510d {-63d 30' 34"} (J2000)
  ROLL:            207.417d
  IMG_START_DATE:  20446 TJD;   137 DOY;   24/05/16
  IMG_START_TIME:  14588.44 SOD {04:03:08.44} UT,   1600.1 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     737525021
  X_OFFSET:        593 [pixels]
  Y_OFFSET:        929 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       753
  Y_GRB_POS:       1089
  BINNING_INDEX:   1
  IM_URL:          sw01228797000msuni1634.fits
  SUN_POSTN:        53.47d {+03h 33m 52s}  +19.20d {+19d 12' 11"}
  SUN_DIST:        133.50 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
  MOON_POSTN:      156.56d {+10h 26m 16s}  +13.53d {+13d 32' 05"}
  MOON_DIST:        88.41 [deg]
  MOON_ILLUM:      57 [%]
  GAL_COORDS:      311.67, -2.00 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      237.00,-46.48 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Image.  
  COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
  COMMENTS:        The image has 2x2 binning (compression).  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Thu 16 May 24 04:06:41 UT
  NOTICE_TYPE:     Swift-UVOT Processed Image
  TRIGGER_NUM:     1228797,   Seg_Num: 0
  POINT_RA:        212.764d {+14h 11m 03s} (J2000)
  POINT_DEC:       -63.510d {-63d 30' 34"} (J2000)
  ROLL:            207.417d
  IMG_START_DATE:  20446 TJD;   137 DOY;   24/05/16
  IMG_START_TIME:  14588.44 SOD {04:03:08.44} UT,   1600.1 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     737525021
  X_OFFSET:        593 [pixels]
  Y_OFFSET:        929 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       753
  Y_GRB_POS:       1089
  BINNING_INDEX:   1
  IM_URL:          sw01228797000msuni1634.fits
  SUN_POSTN:        53.47d {+03h 33m 52s}  +19.20d {+19d 12' 12"}
  SUN_DIST:        133.50 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
  MOON_POSTN:      156.57d {+10h 26m 16s}  +13.53d {+13d 32' 04"}
  MOON_DIST:        88.41 [deg]
  MOON_ILLUM:      57 [%]
  GAL_COORDS:      311.67, -2.00 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      237.00,-46.48 [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 #36496
  Y. Julakanti, B. P. Gompertz, A. Kumar, J. Lyman, R. Starling, K. Ackley, M. J. Dyer, K. Ulaczyk, F. Jimenez-Ibarra, D. O'Neill, D. Steeghs, D. K. Galloway, V. Dhillon, P. O'Brien, G. Ramsay, K. Noysena, R. Kotak, R. P. Breton, L. K. Nuttall, E. Pall'e and D. Pollacco report on behalf of the GOTO collaboration:
  The Gravitational-wave Optical Transient Observer (GOTO, Steeghs et al. 2022) performed a targeted observation in response to Swift detected GRB 240516A (Parostan et al. GCN 36493) also detected by Fermi/GBM (trigger number 737523389) at 2024-05-16 UT 08:29:06 (4.9 hours after trigger). The observation consisted of 3x90s exposures in the GOTO L-band (400-700 nm).
  Images were processed immediately after acquisition using the GOTO pipeline. No optical counterpart is detected within the Swift/XRT 90% localisation region to a 3-sigma limiting magnitude of L > 20.3 (AB).
  Magnitudes were calibrated using ATLAS-REFCAT2 (Tonry et al. 2018) and are not corrected for Galactic extinction.
  GOTO (https://goto-observatory.org) is a network of telescopes that is principally funded by the STFC and operated at the Roque de los Muchachos Observatory on La Palma, Spain, and Siding Spring Observatory in NSW, Australia, on behalf of a consortium including the University of Warwick, Monash University, Armagh Observatory & Planetarium, the University of Leicester, the University of Sheffield, the National Astronomical Research Institute of Thailand (NARIT), the University of Turku, the University of Portsmouth, the University of Manchester and the Instituto de Astrofisica de Canarias (IAC).
• GCN Circular #36499
  S. Bala (USRA), S. Dalessi (UAH) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team:
  "At 03:36:24.84 UT on 16 May 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240516A (trigger 737523389/240516150). which was also detected by Swift BAT (T. M. Parsotan et al. 2024, GCN 36493). The Fermi GBM on-ground location is consistent with the Swift BAT position.
  The angle from the Fermi LAT boresight is 47 degrees.
  The GBM light curve consists of a single emission episode with a duration (T90) of about 46 s (50-300 keV). The time-averaged spectrum from T0+1.0 to T0+45.1 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.69 +/- 0.09 and the cutoff energy, parameterized as Epeak, is 528 +/- 72 keV.
  The event fluence (10-1000 keV) in this time interval is (1.12 +/- 0.06)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+3.7 s in the 10-1000 keV band is 2.4 +/- 0.2 ph/s/cm^2.
  A Band function fits the spectrum equally well with Epeak= 490 +/- 107 keV, alpha = -0.7 +/- 0.1 and beta = -2.1 +/- 0.3.
  The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
  For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
• GCN Circular #36502
  K.L. Page (U. Leicester) reports on behalf of the Swift-XRT team:
  We have analysed 6.7 ks of XRT data for GRB 240516A. Following the prompt detection of an X-ray source reported in GCN Circ. 36493 (Parsotan et al.), Swift passed into the South Atlantic Anomaly, and so no further data were collected until 1.6 ks after the BAT trigger. Combining all the Photon Counting (PC) mode data collected after this time (6.7 ks, from 1.6 to 45.5 ks post-trigger), the source is no longer detected, with a 3-sigma upper limit of 2.2 x 10^-3 count s^-1.
  Assuming a typical GRB spectrum with a photon spectral index of 1.9 and the Galactic absorption column of 1.29 x 10^22 cm^-2 (Willingale et al. 2013), the counts to observed (unabsorbed) 0.3-10 keV flux conversion deduced from this spectrum is 5.6 x 10^-11 (1.0 x 10^-10) erg cm^-2 count^-1. The observed (unabsorbed) flux upper limit for the X-ray source is thus 1.2 x 10^-13 (2.2 x 10^-13) erg cm^-2 s^-1.
  This circular is an official product of the Swift-XRT team.
• GCN Circular #36503
  J. Joshi (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
  Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long-duration GRB 240516A which was also detected by Swift-BAT (Parsotan et al., GCN Circ. 36493) and Fermi-GBM (Fermi GBM team, GCN Circ. 36499).
  The source was detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2024-05-16 03:36:35.02 UTC. The measured peak count rate associated with the burst is 181 (+32, -25) counts/s above the background in the combined data of all quadrants, with a total of 2323 (+336, -367) counts. The local mean background count rate was 1420 (+4, -4) counts/s. We measure a T90 of 22 (+2, -2) s from the cumulative Veto light curve.
  CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.
  CZTI GRB detections are reported regularly on the payload site at: http://astrosat.iucaa.in/czti/?q=grb
• GCN Circular #36508
  S. Chastain (UNM), J. K. Leung (U. Toronto/HUJI), G. E. Anderson (Curtin University), A. Gulati (U. Sydney), L. Rhodes (U. Oxford), A. J. van der Horst (GWU) on behalf of the PanRadio GRB collaboration
  The Australia Telescope Compact Array (ATCA) performed observations of the long GRB 240516A detected by Swift-BAT (Parsotan et al., GCN 36493), Fermi-GBM (S. Bala et al., GCN 26499), and AstroSat CZTI (Joshi et al., GCN 36503) at 5.5, 9, 17 and 19 GHz as part of the Large ATCA "PanRadio GRB" follow-up programme C3542 (PI. Anderson). ATCA start observing on 2024-05-16 at 13:24 UT (~10 hours post-burst) and continued to observe until 21:00 UT on 2024-05-16. In our preliminary analysis, we find no radio source coincident with the Swift XRT uncataloged source (Parsotan et al., GCN 36493) with 3 sigma upper limits of 186, 126, 276 and 381 microJy/beam at 5.5, 9.0, 17 and 19 GHz, respectively.
  We thank the CSIRO Space and Astronomy staff for supporting these observations. We acknowledge the Gomeroi people as the traditional owners of the Observatory site. The Australia Telescope Compact Array is part of the Australia Telescope National Facility (https://ror.org/05qajvd42) which is funded by the Australian Government for operation as a National Facility managed by CSIRO.
• GCN Circular #36510
  S. Laha (GSFC/UMBC), S. D. Barthelmy (GSFC), R. Gupta (GSFC), H. A. Krimm (NSF), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), M. J. Moss (GSFC), D. M. Palmer (LANL), T. Parsotan (GSFC), D. Sadaula (GSFC/UMBC), T. Sakamoto (AGU) (i.e. the Swift-BAT team):
  Using the data set from T-200 to T+200 sec from the recent telemetry downlink, we report further analysis of BAT GRB 240516A (trigger #1228797) (Parsotan et al., GCN Circ. 36493). The BAT ground-calculated position is RA, Dec = 212.784, -63.495 deg which is

     RA(J2000)  =  14h 11m 08.3s
     Dec(J2000) = -63d 29' 41.7"
  

  with an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 45%.
  The mask-weighted light curve shows a single-peaked, FRED-like structure that starts at ~T-5 s, peaks at ~T-2 s, and ends at ~T+15 s. In addition, there are some weak tail emissions that last till ~T+110 s. T90 (15-350 keV) is 94.69 +- 34.00 sec (estimated error including systematics).
  The time-averaged spectrum from T-4.75 to T+112.50 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.09 +- 0.19. The fluence in the 15-150 keV band is 2.0 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-2.20 sec in the 15-150 keV band is 1.1 +- 0.3 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/1228797
• GCN Circular #36517
  S. P. R. Shilling (Lancaster U.), S. R. Oates (Lancaster U.), N. P. Kuin (UCL-MSSL), A. A. Breeveld (UCL-MSSL) and T. M. Parsotan (GSFC) report on behalf of the Swift/UVOT team:
  The Swift/UVOT began settled observations of the field of GRB 240516A 150 s after the BAT trigger (Parsotan et al., GCN Circ. 36493). No optical afterglow consistent with the XRT position (Parsotan et al., GCN Circ. 36493) 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 initial exposures are:

  Filter         T_start(s)   T_stop(s)      Exp(s)         Mag
  
  white_FC          151          153            2          >17.8
  white             150          1689           90         >19.9
  v                 5228         5427           197        >18.9
  m2                5432         5632           197        >18.9
  w1                5638         5838           197        >19.1
  u                 5843         5948           104        >19.1
  

  We note that the first orbit of data only contained observations in the white filter. The other filters are from a later orbit of data.
  The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 2.390 in the direction of the burst (Schlegel et al. 1998).