Gamma-ray Burst 200612A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 12 Jun 20 04:47:31 UT
  NOTICE_TYPE:     Swift-BAT GRB Position
  TRIGGER_NUM:     977310,   Seg_Num: 0
  GRB_RA:          302.681d {+20h 10m 43s} (J2000),
                   303.040d {+20h 12m 10s} (current),
                   301.802d {+20h 07m 12s} (1950)
  GRB_DEC:         -45.357d {-45d 21' 24"} (J2000),
                   -45.295d {-45d 17' 41"} (current),
                   -45.505d {-45d 30' 19"} (1950)
  GRB_ERROR:       3.00 [arcmin radius, statistical only]
  GRB_INTEN:       7233 [cnts]    Image_Peak=254 [image_cnts]
  TRIGGER_DUR:     2.048 [sec] 
  TRIGGER_INDEX:   262     E_range: 25-100 keV
  BKG_INTEN:       71146 [cnts]
  BKG_TIME:        16742.90 SOD {04:39:02.90} UT
  BKG_DUR:         24 [sec]
  GRB_DATE:        19012 TJD;   164 DOY;   20/06/12
  GRB_TIME:        16777.14 SOD {04:39:37.14} UT
  GRB_PHI:          33.18 [deg]
  GRB_THETA:        15.60 [deg]
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     10.09 [sigma]
  IMAGE_SIGNIF:    8.04 [sigma]
  MERIT_PARAMS:     +1  +0  +0  +1  +2  -2  +0  +0 +76  +0 
  SUN_POSTN:        80.96d {+05h 23m 50s}  +23.18d {+23d 10' 32"}
  SUN_DIST:        139.44 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
  MOON_POSTN:      343.35d {+22h 53m 25s}  -12.49d {-12d 29' 37"}
  MOON_DIST:        47.36 [deg]
  MOON_ILLUM:      60 [%]
  GAL_COORDS:      354.50,-32.45 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      294.68,-24.68 [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 = 17.02,-20.02 [deg].  
  

• red DSS finding chart ps-file
  
  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 12 Jun 20 04:48:23 UT
  NOTICE_TYPE:     Swift-XRT Processed Image
  TRIGGER_NUM:     977310,   Seg_Num: 0
  GRB_RA:          302.7017d {+20h 10m 48.4s} (J2000),
                   303.0603d {+20h 12m 14.4s} (current),
                   301.8224d {+20h 07m 17.3s} (1950)
  GRB_DEC:         -45.3343d {-45d 20' 03.4"} (J2000),
                   -45.2725d {-45d 16' 21.0"} (current),
                   -45.4829d {-45d 28' 58.4"} (1950)
  GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
  GRB_INTEN:       66 [cnts]
  IMG_START_DATE:  19012 TJD;   164 DOY;   20/06/12
  IMG_START_TIME:  16864.76 SOD {04:41:04.76} UT,   87.6 [sec] since BAT Trigger Time
  CENTROID_X:      276.66,  raw= 277  [pixels]
  CENTROID_Y:      341.04,  raw= 341  [pixels]
  ROLL:            109.09 [deg]
  GAIN:            1
  MODE:            3, Long Image mode
  WAVEFORM:        134
  EXPO_TIME:       2.50 [sec]
  GRB_POS_XRT_Y:   101.24
  GRB_POS_XRT_Z:   -72.44
  IMAGE_URL:       sw00977310000msxps_rw.img
  SUN_POSTN:        80.96d {+05h 23m 50s}  +23.18d {+23d 10' 32"}
  SUN_DIST:        139.43 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
  MOON_POSTN:      343.36d {+22h 53m 27s}  -12.49d {-12d 29' 28"}
  MOON_DIST:        47.34 [deg]
  MOON_ILLUM:      60 [%]
  GAL_COORDS:      354.53,-32.46 [deg] galactic lon,lat of the burst
  ECL_COORDS:      294.70,-24.66 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Processed Image.  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 12 Jun 20 04:49:00 UT
  NOTICE_TYPE:     Swift-BAT GRB Lightcurve
  TRIGGER_NUM:     977310,   Seg_Num: 0
  GRB_RA:          302.681d {+20h 10m 43s} (J2000),
                   303.040d {+20h 12m 10s} (current),
                   301.802d {+20h 07m 12s} (1950)
  GRB_DEC:         -45.357d {-45d 21' 24"} (J2000),
                   -45.295d {-45d 17' 41"} (current),
                   -45.505d {-45d 30' 19"} (1950)
  GRB_DATE:        19012 TJD;   164 DOY;   20/06/12
  GRB_TIME:        16777.14 SOD {04:39:37.14} UT
  TRIGGER_INDEX:   262
  GRB_PHI:          33.18 [deg]
  GRB_THETA:        15.60 [deg]
  DELTA_TIME:      -63.00 [sec]
  TRIGGER_DUR:     2.048 [sec] 
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     10.09 [sigma]
  IMAGE_SIGNIF:    8.04 [sigma]
  LC_URL:          sw00977310000msb.lc
  SUN_POSTN:        80.96d {+05h 23m 50s}  +23.18d {+23d 10' 32"}
  SUN_DIST:        139.44 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
  MOON_POSTN:      343.37d {+22h 53m 28s}  -12.49d {-12d 29' 21"}
  MOON_DIST:        47.37 [deg]
  MOON_ILLUM:      60 [%]
  GAL_COORDS:      354.50,-32.45 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      294.68,-24.68 [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 = 17.02,-20.02 [deg].  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 12 Jun 20 04:49:26 UT
  NOTICE_TYPE:     Swift-UVOT Processed Source List
  TRIGGER_NUM:     977310,   Seg_Num: 0
  POINT_RA:        302.662d {+20h 10m 39s} (J2000)
  POINT_DEC:       -45.355d {-45d 21' 17"} (J2000)
  POINT_ROLL:      109.091d
  IMG_START_DATE:  19012 TJD;   164 DOY;   20/06/12
  IMG_START_TIME:  16872.66 SOD {04:41:12.66} UT,   95.5 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        5.022
  N_STARS:         81
  X_OFFSET:        560 [pixels]
  Y_OFFSET:        496 [pixels]
  X_MAX:           1519 [pixels]
  Y_MAX:           1455 [pixels]
  DET_THRESH:      19
  PHOTO_THRESH:    11
  SL_URL:          sw00977310000msufc0095.fits
  SUN_POSTN:        80.96d {+05h 23m 50s}  +23.18d {+23d 10' 32"}
  SUN_DIST:        139.45 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
  MOON_POSTN:      343.37d {+22h 53m 29s}  -12.49d {-12d 29' 17"}
  MOON_DIST:        47.38 [deg]
  MOON_ILLUM:      60 [%]
  GAL_COORDS:      354.50,-32.43 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      294.67,-24.67 [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 12 Jun 20 04:49:09 UT
  NOTICE_TYPE:     Swift-UVOT Source List
  TRIGGER_NUM:     977310,   Seg_Num: 0
  POINT_RA:        302.662d {+20h 10m 39s} (J2000)
  POINT_DEC:       -45.355d {-45d 21' 17"} (J2000)
  POINT_ROLL:      109.091d
  IMG_START_DATE:  19012 TJD;   164 DOY;   20/06/12
  IMG_START_TIME:  16872.66 SOD {04:41:12.66} UT,   95.5 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        5.022
  N_STARS:         81
  X_OFFSET:        560 [pixels]
  Y_OFFSET:        496 [pixels]
  X_MAX:           1519 [pixels]
  Y_MAX:           1455 [pixels]
  DET_THRESH:      19
  PHOTO_THRESH:    11
  SL_URL:          sw00977310000msufc0095.fits
  SUN_POSTN:        80.96d {+05h 23m 50s}  +23.18d {+23d 10' 32"}
  SUN_DIST:        139.45 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
  MOON_POSTN:      343.37d {+22h 53m 28s}  -12.49d {-12d 29' 20"}
  MOON_DIST:        47.38 [deg]
  MOON_ILLUM:      60 [%]
  GAL_COORDS:      354.50,-32.43 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      294.67,-24.67 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Source List.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 12 Jun 20 04:48:17 UT
  NOTICE_TYPE:     Swift-XRT Image
  TRIGGER_NUM:     977310,   Seg_Num: 0
  GRB_RA:          302.7017d {+20h 10m 48.4s} (J2000),
                   303.0603d {+20h 12m 14.4s} (current),
                   301.8224d {+20h 07m 17.3s} (1950)
  GRB_DEC:         -45.3343d {-45d 20' 03.4"} (J2000),
                   -45.2725d {-45d 16' 21.0"} (current),
                   -45.4829d {-45d 28' 58.4"} (1950)
  GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
  GRB_INTEN:       66 [cnts]
  IMG_START_DATE:  19012 TJD;   164 DOY;   20/06/12
  IMG_START_TIME:  16864.76 SOD {04:41:04.76} UT,   87.6 [sec] since BAT Trigger Time
  CENTROID_X:      276.66,  raw= 277  [pixels]
  CENTROID_Y:      341.04,  raw= 341  [pixels]
  ROLL:            109.09 [deg]
  GAIN:            1
  MODE:            3, Long Image mode
  WAVEFORM:        134
  EXPO_TIME:       2.50 [sec]
  GRB_POS_XRT_Y:   101.24
  GRB_POS_XRT_Z:   -72.44
  IMAGE_URL:       sw00977310000msxps_rw.img
  SUN_POSTN:        80.96d {+05h 23m 50s}  +23.18d {+23d 10' 32"}
  SUN_DIST:        139.43 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
  MOON_POSTN:      343.36d {+22h 53m 27s}  -12.49d {-12d 29' 29"}
  MOON_DIST:        47.34 [deg]
  MOON_ILLUM:      60 [%]
  GAL_COORDS:      354.53,-32.46 [deg] galactic lon,lat of the burst
  ECL_COORDS:      294.70,-24.66 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Image.  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 12 Jun 20 04:48:07 UT
  NOTICE_TYPE:     Swift-XRT Position
  TRIGGER_NUM:     977310,   Seg_Num: 0
  GRB_RA:          302.7017d {+20h 10m 48.40s} (J2000),
                   303.0603d {+20h 12m 14.46s} (current),
                   301.8224d {+20h 07m 17.37s} (1950)
  GRB_DEC:         -45.3343d {-45d 20' 03.4"} (J2000),
                   -45.2725d {-45d 16' 21.0"} (current),
                   -45.4829d {-45d 28' 58.4"} (1950)
  GRB_ERROR:       5.1 [arcsec radius, statistical plus systematic, 90% containment]
  GRB_INTEN:       2.13e-09 [erg/cm2/sec]
  GRB_SIGNIF:      8.12 [sigma]
  IMG_START_DATE:  19012 TJD;   164 DOY;   20/06/12
  IMG_START_TIME:  16864.76 SOD {04:41:04.76} UT,   87.6 [sec] since BAT Trigger Time
  TAM[0-3]:        327.64 237.22 261.58 243.66
  AMPLIFIER:       2
  WAVEFORM:        134
  SUN_POSTN:        80.96d {+05h 23m 50s}  +23.18d {+23d 10' 32"}
  SUN_DIST:        139.43 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
  MOON_POSTN:      343.36d {+22h 53m 26s}  -12.49d {-12d 29' 31"}
  MOON_DIST:        47.34 [deg]
  MOON_ILLUM:      60 [%]
  GAL_COORDS:      354.53,-32.46 [deg] galactic lon,lat of the burst
  ECL_COORDS:      294.70,-24.66 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Coordinates.  
  COMMENTS:        The XRT position is 1.60 arcmin from the BAT position.
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 12 Jun 20 04:51:48 UT
  NOTICE_TYPE:     Swift-UVOT Image
  TRIGGER_NUM:     977310,   Seg_Num: 0
  POINT_RA:        302.662d {+20h 10m 39s} (J2000)
  POINT_DEC:       -45.355d {-45d 21' 17"} (J2000)
  ROLL:            109.091d
  IMG_START_DATE:  19012 TJD;   164 DOY;   20/06/12
  IMG_START_TIME:  16872.66 SOD {04:41:12.66} UT,   95.5 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     613629697
  X_OFFSET:        829 [pixels]
  Y_OFFSET:        634 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       989
  Y_GRB_POS:       794
  BINNING_INDEX:   1
  IM_URL:          sw00977310000msuni0121.fits
  SUN_POSTN:        80.96d {+05h 23m 50s}  +23.18d {+23d 10' 33"}
  SUN_DIST:        139.45 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
  MOON_POSTN:      343.39d {+22h 53m 33s}  -12.48d {-12d 28' 51"}
  MOON_DIST:        47.40 [deg]
  MOON_ILLUM:      60 [%]
  GAL_COORDS:      354.50,-32.43 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      294.67,-24.67 [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 12 Jun 20 04:52:11 UT
  NOTICE_TYPE:     Swift-UVOT Processed Image
  TRIGGER_NUM:     977310,   Seg_Num: 0
  POINT_RA:        302.662d {+20h 10m 39s} (J2000)
  POINT_DEC:       -45.355d {-45d 21' 17"} (J2000)
  ROLL:            109.091d
  IMG_START_DATE:  19012 TJD;   164 DOY;   20/06/12
  IMG_START_TIME:  16872.66 SOD {04:41:12.66} UT,   95.5 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     613629697
  X_OFFSET:        829 [pixels]
  Y_OFFSET:        634 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       989
  Y_GRB_POS:       794
  BINNING_INDEX:   1
  IM_URL:          sw00977310000msuni0121.fits
  SUN_POSTN:        80.96d {+05h 23m 51s}  +23.18d {+23d 10' 33"}
  SUN_DIST:        139.45 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
  MOON_POSTN:      343.39d {+22h 53m 34s}  -12.48d {-12d 28' 47"}
  MOON_DIST:        47.40 [deg]
  MOON_ILLUM:      60 [%]
  GAL_COORDS:      354.50,-32.43 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      294.67,-24.67 [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 12 Jun 20 04:55:28 UT
  NOTICE_TYPE:     Swift-UVOT Source List
  TRIGGER_NUM:     977310,   Seg_Num: 0
  POINT_RA:        302.662d {+20h 10m 39s} (J2000)
  POINT_DEC:       -45.355d {-45d 21' 17"} (J2000)
  POINT_ROLL:      109.091d
  IMG_START_DATE:  19012 TJD;   164 DOY;   20/06/12
  IMG_START_TIME:  17084.71 SOD {04:44:44.71} UT,   307.6 [sec] since BAT Trigger Time
  FILTER:          7, U
  BKG_MEAN:        0.900
  N_STARS:         21
  X_OFFSET:        509 [pixels]
  Y_OFFSET:        314 [pixels]
  X_MAX:           1468 [pixels]
  Y_MAX:           1273 [pixels]
  DET_THRESH:      8
  PHOTO_THRESH:    4
  SL_URL:          sw00977310000msufc0307.fits
  SUN_POSTN:        80.96d {+05h 23m 51s}  +23.18d {+23d 10' 33"}
  SUN_DIST:        139.45 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
  MOON_POSTN:      343.42d {+22h 53m 40s}  -12.47d {-12d 28' 12"}
  MOON_DIST:        47.42 [deg]
  MOON_ILLUM:      60 [%]
  GAL_COORDS:      354.50,-32.43 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      294.67,-24.67 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Source List.  
  COMMENTS:        The Pointing RA,Dec,Roll values came from the 1st SrcList Notice.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 12 Jun 20 04:55:42 UT
  NOTICE_TYPE:     Swift-UVOT Processed Source List
  TRIGGER_NUM:     977310,   Seg_Num: 0
  POINT_RA:        302.662d {+20h 10m 39s} (J2000)
  POINT_DEC:       -45.355d {-45d 21' 17"} (J2000)
  POINT_ROLL:      109.091d
  IMG_START_DATE:  19012 TJD;   164 DOY;   20/06/12
  IMG_START_TIME:  17084.71 SOD {04:44:44.71} UT,   307.6 [sec] since BAT Trigger Time
  FILTER:          7, U
  BKG_MEAN:        0.900
  N_STARS:         21
  X_OFFSET:        509 [pixels]
  Y_OFFSET:        314 [pixels]
  X_MAX:           1468 [pixels]
  Y_MAX:           1273 [pixels]
  DET_THRESH:      8
  PHOTO_THRESH:    4
  SL_URL:          sw00977310000msufc0307.fits
  SUN_POSTN:        80.96d {+05h 23m 51s}  +23.18d {+23d 10' 33"}
  SUN_DIST:        139.45 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
  MOON_POSTN:      343.42d {+22h 53m 41s}  -12.47d {-12d 28' 10"}
  MOON_DIST:        47.43 [deg]
  MOON_ILLUM:      60 [%]
  GAL_COORDS:      354.50,-32.43 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      294.67,-24.67 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Processed Source List.  
  COMMENTS:        All 4 attachments are included.  
  

  
• GCN Circular #27915
  E. Sonbas (Adiyaman Univ.), C. Gronwall (PSU), N. J. Klingler (PSU), H. A. Krimm (NSF), A. Y. Lien (GSFC/UMBC), K. L. Page (U Leicester), D. M. Palmer (LANL), M. H. Siegel (PSU) and A. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift Observatory Team:
  At 04:39:37 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 200612A (trigger=977310). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 302.681, -45.357 which is

     RA(J2000) = 20h 10m 43s
     Dec(J2000) = -45d 21' 24"
  

  with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 40 sec. There is possible lower-level activity out to T+180s. The peak count rate was ~1400 counts/sec (15-350 keV), at ~1 sec after the trigger.
  The XRT began observing the field at 04:41:04.7 UT, 87.7 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 302.7017, -45.3343 which is equivalent to:

     RA(J2000)  = 20h 10m 48.41s
     Dec(J2000) = -45d 20' 03.5"
  

  with an uncertainty of 5.1 arcseconds (radius, 90% containment). This location is 97 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy.
  The initial flux in the 2.5 s image was 2.13e-09 erg cm^-2 s^-1 (0.2-10 keV).
  UVOT took a finding chart exposure of 150 seconds with the White filter starting 95 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.
  We note that Fermi-GBM sees a GRB in a similar location at T+10 minutes, (trigger 613630183) which may be extended activity of the same source. At that time, BAT had slewed away from the source.
  Burst Advocate for this burst is E. Sonbas (edasonbas AT yahoo.com). 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 Circular #27915
  V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department),
  R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA),
  H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE),
  R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias),
  D. Buckley (South African Astronomical Observatory),
  O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API),
  A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
  V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University)
  MASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) was pointed to the Swift GRB200612.19 (trigger No 977310,20h 10m 43.44s , -45d 21m 25.2s, R=0.05) errorbox 10 sec after notice time and 495 sec after trigger time at 2020-06-12 04:47:52 UT, with upper limit up to 18.3 mag. The observations began at zenith distance = 33 deg. The sun altitude is -81.6 deg.
  The galactic latitude b = -33 deg., longitude l = 355 deg.
  Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1380088
  We obtain a following upper limits.

  Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
  _________|_____________________|_____|_______|______|________
  
       546 |         MASTER-OAFA |   C |   100 | 18.3 |        
  

  Filter C is a clear (unfiltred) band.
  The observation and reduction will continue. The message may be cited.
• GCN Circular #27918
  V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department),
  R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA),
  H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE),
  R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias),
  D. Buckley (South African Astronomical Observatory),
  O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API),
  A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
  V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University)
  MASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB200612.20 (trigger No 613630183,18h 53m 52.08s , -36d 55m 01.2s, R=34.25) errorbox 25 sec after trigger time at 2020-06-12 04:50:04 UT, with upper limit up to 18.9 mag. The observations began at zenith distance = 33 deg. The sun altitude is -81.4 deg.
  The galactic latitude b = -17 deg., longitude l = 360 deg.
  Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1380117
  We obtain a following upper limits.

  Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
  _________|_____________________|_____________________|____________________________________|_____|_______|_______|________
  
        85 | 2020-06-12 04:50:04 |         MASTER-OAFA | (20h 09m 37.26s , -45d 26m 59.1s) |   C |   120 | 18.5 |        
       252 | 2020-06-12 04:52:35 |         MASTER-OAFA | (20h 09m 33.88s , -45d 25m 35.5s) |   C |   150 | 18.6 |        
       449 | 2020-06-12 04:55:38 |         MASTER-OAFA | (20h 09m 34.04s , -45d 27m 14.1s) |   C |   180 | 18.7 |        
       661 | 2020-06-12 04:59:09 |         MASTER-OAFA | (20h 09m 37.75s , -45d 25m 33.7s) |   C |   180 | 18.8 |        
       872 | 2020-06-12 05:02:40 |         MASTER-OAFA | (20h 09m 30.94s , -45d 26m 22.0s) |   C |   180 | 18.9 |        
      1083 | 2020-06-12 05:06:11 |         MASTER-OAFA | (20h 09m 31.75s , -45d 25m 21.9s) |   C |   180 | 18.9 |        
      1295 | 2020-06-12 05:09:43 |         MASTER-OAFA | (20h 09m 37.94s , -45d 26m 20.9s) |   C |   180 | 18.8 |        
      1505 | 2020-06-12 05:13:14 |         MASTER-OAFA | (20h 09m 31.14s , -45d 27m 20.6s) |   C |   180 | 18.9 |        
      1717 | 2020-06-12 05:16:45 |         MASTER-OAFA | (20h 09m 37.75s , -45d 26m 57.9s) |   C |   180 | 18.9 |        
  

  Filter C is a clear (unfiltred) band.
  The observation and reduction will continue. The message may be cited.
• GCN Circular #27919
  Y.-D. Hu, E. Fernandez-Garcia, A. J. Castro-Tirado (IAA-CSIC), I. Carrasco and C. Perez del Pulgar (Univ. de Malaga), M. D. Caballero-Garcia (ASU-CAS, CZ) and R. Querel (NIWA), on behalf of a larger collaboration, report:
  The 60cm BOOTES-3/YA robotic telescope at NIWA Lauder in Otago (New Zealand) responded to the Swift trigger of GRB 200612A (Sonbas et al. GCNC 27915). The first image (clear filter) was obtained starting at 09:51:32 UT(~ 5.2 hr after trigger). In the co-added image (20 exposures 60s each), no source is found at the position reported by Swift/XRT (Sonbas et al. GCNC 27915) and MASTER-Net (Lipunov et al. GCNC 27917) down to 20.3 mag.
  We thank the staff at NIWA for its excellent support.
• GCN Circular #27920
  N.Tiurina, Lomonosow NSU
  We find very late OT (Lipunov et al., GCN 27917) maximum ~17.5 around 2020-06-12 04:59:09 UT .
  This message can be cited.
• GCN Circular #27921
  J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
  Using 2651 s of XRT Photon Counting mode data and 7 UVOT images for GRB 200612A, 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 = 302.70204, -45.33550 which is equivalent to:

  RA (J2000): 20h 10m 48.49s
  Dec (J2000): -45d 20' 07.8"
  

  with an uncertainty of 1.5 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 #27922
  D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, M. Ulanov, A. Tsvetkova, A.Lysenko, A. Ridnaia, and T. Cline on behalf of the Konus-Wind team, report:
  The ultra-long GRB 200612A (Swift-BAT detection Sonbas et al., GCN 27915; MASTER OT detection: Lipunov et al., GCN 27917) was detected by Konus-Wind in the waiting mode.
  The burst light curve shows four emission episodes in the interval from ~T0(BAT) s to ~T0(BAT)+1020 s.
  The K-W light curve of this burst is available at http://www.ioffe.ru/LEA/GRBs/GRB200612A/
  As observed by Konus-Wind, the burst had a fluence of 4.08(-0.34,+1.04)x10^-5 erg/cm2 and a 2.944-s peak flux, measured from ~T0(BAT)+478.8 s, of 2.75(-0.62,+0.85)x10^-7 erg/cm2/s (both in the 20 - 1500 keV energy band).
  The K-W 3-channel time-integrated spectrum (from ~T0(BAT) s to ~T0(BAT)+1020 s) is well described by a cutoff power-law model with alpha = -1.0(-0.2,+0.3) and Ep= 253(-65,+95) keV.
  All the quoted errors are estimated at the 1 sigma confidence level. All the presented results are preliminary.
• ATel #13803
  Title: MASTER: unique late maximum of optical counterpart from ultralong GRB 200612A
  V. Lipunov (Lomonosov MSU), D. Svinkin (Ioffe Institute), R. Podesta (OAFA), E. Gorbovskoy, V. Kornilov, N. Tyurina, I. Gorbunov, P. Balanutsa, A. Kuznetsov, F. Balakin, V. Vladimirov, D. Vlasenko, D. Zimnukhov, V. Senik, T. Pogrosheva, D. Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department), F. Podesta, C. Francile (OAFA), H. Levato (ICATE), R. Rebolo, M. Serra (IAC), D. Buckley (SAAO), O. A. Gres, N. M. Budnev (ISU, API), A. Tlatov (KSS of the Pulkovo Observatory), A. Gabovich, Yu. Sergienko, V. Yurkov(BSPU)
  MASTER OT J201048.64-452006.7 discovery - optical counterpart of ultralong GRB 200612A
  MASTER Global Robotic Net ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) started alert observation of Swift GRB 200612A (Sonbas et al. GCN #27915) 10s after notice time (Lipunov et al. GCN #27916, GCN #27917, GCN #27920) at 2020-06-12 04:47:52 UT (495 sec after trigger time). The optical counterpart MASTER OT J201048.64-452006.7 was discovered by MASTER auto-detection system (GCN #27917) more then 10 minutes after trigger time.
  We report late optical maximum (~20 min after trigger time) of this unique very long GRB, see Konus-Wind team report (Svinkin et al. GCN #27922)
  Deep photometry is requested (5.2h later there is no OT up to 20.3 , Hu et al. GCN #27919).
  MASTER Global Robotic Net: http://observ.pereplet.ru
• GCN Circular #27923
  A. D'Ai (INAF-IASFPA), J. D. Gropp (PSU), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), A. Melandri (INAF-OAB), T. Sbarrato (INAF-OAB) and E. Sonbas report on behalf of the Swift-XRT team:
  We have analysed 7.4 ks of XRT data for GRB 200612A (Sonbas et al. GCN Circ. 27915), from 93 s to 63.5 ks after the BAT trigger. The data comprise 281 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN Circ. 27921).
  The late-time light curve (from T0+3.7 ks) can be modelled with a power-law decay with a decay index of alpha=1.37 (+/-0.09).
  A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.07 (+/-0.05). The best-fitting absorption column is 9.1 (+2.3, -2.1) x 10^20 cm^-2, in excess of the Galactic value of 3.7 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.06 (+0.19, -0.17) and a best-fitting absorption column of 5.7 (+4.1, -2.0) x 10^20 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.1 x 10^-11 (3.6 x 10^-11) erg cm^-2 count^-1.
  A summary of the PC-mode spectrum is thus:

  Total column:	     5.7 (+4.1, -2.0) x 10^20 cm^-2
  Galactic foreground: 3.7 x 10^20 cm^-2
  Excess significance: <1.6 sigma
  Photon index:	     2.06 (+0.19, -0.17)
  

  If the light curve continues to decay with a power-law decay index of 1.37, the count rate at T+24 hours will be 0.010 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.2 x 10^-13 (3.7 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/00977310.
  This circular is an official product of the Swift-XRT team.
• GCN Circular #27924
  C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), D. M. Palmer (LANL), T. Sakamoto (AGU), E. Sonbas (Adiyaman Univ.), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
  Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 200612A (trigger #977310) (E. Sonbas et al., GCN Circ. 27915). The BAT ground-calculated position is RA, Dec = 302.691, -45.354 deg which is

     RA(J2000)  =  20h 10m 45.8s
     Dec(J2000) = -45d 21' 12.7"
  

  with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 96%.
  The mask weighted light curve shows a complex structure. The overall structure starts at ~T-20 s and lasts till ~T+200 s. T90 (15-350 keV) is 171.48 +- 19.74 sec (estimated error including systematics).
  The time-averaged spectrum from T-11 to T+193 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.34 +- 0.09. The fluence in the 15-150 keV band is 3.8 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+4.03 sec in the 15-150 keV band is 0.7 +- 0.2 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/977310/BA/
• GCN Circular #27925
  GRB 200612A: Swift/UVOT Upper Limits
  S. J. LaPorte (PSU) and E. Sonbas (Adiyaman Univ.) report on behalf of the Swift/UVOT team:
  The Swift/UVOT began settled observations of the field of GRB 200612A 96 s after the BAT trigger (Sonbas et al., GCN Circ. 27915). No optical afterglow consistent with the optical position (Lipunov et al. GCN Circ. 27917) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:

  Filter         T_start(s)   T_stop(s)      Exp(s)         Mag
  
  white_FC            96          245          147         >20.6
  white               96          245          147         >20.6
  u                  308          375           67         >19.2
  

  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 #27929
  GRB 200612A: Swift/UVOT Upper Limits
  S. J. LaPorte (PSU) and E. Sonbas (Adiyaman Univ.) report on behalf of the Swift/UVOT team:
  The Swift/UVOT began settled observations of the field of GRB 200612A 96 s after the BAT trigger (Sonbas et al., GCN Circ. 27915). No optical afterglow consistent with the optical position (Lipunov et al. GCN Circ. 27917) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:

  Filter         T_start(s)   T_stop(s)      Exp(s)         Mag
  
  white_FC            96          245          147         >20.6
  white               96          245          147         >20.6
  u                  308          375           67         >19.2
  

  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 #27934
  C. Malacaria (NASA-MSFC/USRA), E. Burns (NASA-GSFC) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
  At 04:49:38.68 UT on June 06 2020, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 200612A (trigger 613630183/200612201), which was also detected by the Swift (Osborne et al. 2020, GCN 27921) and Konus-Wind (Sonbas et al. 2020, GCN 27915; Svinkin et al. 2020, GCN 27922). The GBM on-ground location is consistent with the Swift position.
  The angle from the Fermi LAT boresight at the GBM trigger time is 50 degrees.
  The GBM light curve shows multiple pulses with a duration (T90) of about 88 s (50-300 keV). The GBM light curve also shows evidence of emission preceding the trigger time, in agreement with the super-long GRB classification by Konus-Wind.
  The time-averaged spectrum from T0-214 s to T0+89 s is best-fit by a power-law with a photon index of -1.80 +/- 0.02.
  The event fluence (10-1000 keV) in this time interval is (4.187 +/- 0.109)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+52 s in the 10-1000 keV band is 2.8 +/- 0.2 ph/s/cm^2.
  The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
  For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/