Gamma-ray Burst 100305A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 05 Mar 10 09:07:01 UT
  NOTICE_TYPE:     Swift-BAT GRB Position
  TRIGGER_NUM:     414905,   Seg_Num: 0
  GRB_RA:          168.365d {+11h 13m 28s} (J2000),
                   168.506d {+11h 14m 01s} (current),
                   167.672d {+11h 10m 41s} (1950)
  GRB_DEC:         +42.376d {+42d 22' 34"} (J2000),
                   +42.321d {+42d 19' 15"} (current),
                   +42.649d {+42d 38' 55"} (1950)
  GRB_ERROR:       3.00 [arcmin radius, statistical only]
  GRB_INTEN:       0 [cnts]    Image_Peak=1143 [image_cnts]
  TRIGGER_DUR:     64.000 [sec] 
  TRIGGER_INDEX:   20000     E_range: 15-50 keV
  BKG_INTEN:       0 [cnts]
  BKG_TIME:        0.00 SOD {00:00:00.00} UT
  BKG_DUR:         0 [sec]
  GRB_DATE:        15260 TJD;    64 DOY;   10/03/05
  GRB_TIME:        32738.41 SOD {09:05:38.41} UT
  GRB_PHI:         103.29 [deg]
  GRB_THETA:        34.45 [deg]
  SOLN_STATUS:     0x13
  RATE_SIGNIF:     0.00 [sigma]
  IMAGE_SIGNIF:    8.24 [sigma]
  MERIT_PARAMS:     +1  +0  +0  +6  +1  -1  +0  +0 +80  +0 
  SUN_POSTN:       345.89d {+23h 03m 34s}   -6.03d {-06d 01' 53"}
  SUN_DIST:        143.64 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
  MOON_POSTN:      223.86d {+14h 55m 27s}  -21.48d {-21d 28' 47"}
  MOON_DIST:        81.69 [deg]
  MOON_ILLUM:      73 [%]
  GAL_COORDS:      169.17, 64.91 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      150.78, 33.99 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        SWIFT-BAT GRB Coordinates.  
  COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)  
  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 = 315.90,15.91 [deg].  
  

• red DSS finding chart ps-file
  
  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 05 Mar 10 09:08:29 UT
  NOTICE_TYPE:     Swift-XRT Position
  TRIGGER_NUM:     414905,   Seg_Num: 0
  GRB_RA:          168.3683d {+11h 13m 28.39s} (J2000),
                   168.5090d {+11h 14m 02.16s} (current),
                   167.6748d {+11h 10m 41.94s} (1950)
  GRB_DEC:         +42.4042d {+42d 24' 15.1"} (J2000),
                   +42.3487d {+42d 20' 55.3"} (current),
                   +42.6765d {+42d 40' 35.5"} (1950)
  GRB_ERROR:       6.4 [arcsec radius, statistical plus systematic, 90% containment]
  GRB_INTEN:       4.86e-10 [erg/cm2/sec]
  GRB_SIGNIF:      4.69 [sigma]
  IMG_START_DATE:  15260 TJD;    64 DOY;   10/03/05
  IMG_START_TIME:  32877.61 SOD {09:07:57.61} UT,   139.2 [sec] since BAT Trigger Time
  TAM[0-3]:        327.65 237.23 261.54 243.43
  AMPLIFIER:       2
  WAVEFORM:        134
  SUN_POSTN:       345.89d {+23h 03m 34s}   -6.03d {-06d 01' 52"}
  SUN_DIST:        143.61 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
  MOON_POSTN:      223.88d {+14h 55m 31s}  -21.48d {-21d 29' 00"}
  MOON_DIST:        81.71 [deg]
  MOON_ILLUM:      73 [%]
  GAL_COORDS:      169.11, 64.90 [deg] galactic lon,lat of the burst
  ECL_COORDS:      150.76, 34.02 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Coordinates.  
  COMMENTS:        The XRT position is 1.68 arcmin from the BAT position.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 05 Mar 10 09:08:39 UT
  NOTICE_TYPE:     Swift-XRT Image
  TRIGGER_NUM:     414905,   Seg_Num: 0
  GRB_RA:          168.3683d {+11h 13m 28.3s} (J2000),
                   168.5090d {+11h 14m 02.1s} (current),
                   167.6748d {+11h 10m 41.9s} (1950)
  GRB_DEC:         +42.4042d {+42d 24' 15.1"} (J2000),
                   +42.3487d {+42d 20' 55.3"} (current),
                   +42.6765d {+42d 40' 35.5"} (1950)
  GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
  GRB_INTEN:       22 [cnts]
  IMG_START_DATE:  15260 TJD;    64 DOY;   10/03/05
  IMG_START_TIME:  32877.61 SOD {09:07:57.61} UT,   139.2 [sec] since BAT Trigger Time
  CENTROID_X:      284.52,  raw= 285  [pixels]
  CENTROID_Y:      294.56,  raw= 295  [pixels]
  ROLL:            4.14 [deg]
  GAIN:            1
  MODE:            3, Long Image mode
  WAVEFORM:        134
  EXPO_TIME:       2.50 [sec]
  GRB_POS_XRT_Y:   -8.10
  GRB_POS_XRT_Z:   -41.90
  IMAGE_URL:       sw00414905000msxps_rw.img
  SUN_POSTN:       345.89d {+23h 03m 34s}   -6.03d {-06d 01' 51"}
  SUN_DIST:        143.61 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
  MOON_POSTN:      223.88d {+14h 55m 31s}  -21.48d {-21d 29' 01"}
  MOON_DIST:        81.72 [deg]
  MOON_ILLUM:      73 [%]
  GAL_COORDS:      169.11, 64.90 [deg] galactic lon,lat of the burst
  ECL_COORDS:      150.76, 34.02 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Image.  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 05 Mar 10 09:08:46 UT
  NOTICE_TYPE:     Swift-XRT Processed Image
  TRIGGER_NUM:     414905,   Seg_Num: 0
  GRB_RA:          168.3683d {+11h 13m 28.3s} (J2000),
                   168.5090d {+11h 14m 02.1s} (current),
                   167.6748d {+11h 10m 41.9s} (1950)
  GRB_DEC:         +42.4042d {+42d 24' 15.1"} (J2000),
                   +42.3487d {+42d 20' 55.3"} (current),
                   +42.6765d {+42d 40' 35.5"} (1950)
  GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
  GRB_INTEN:       22 [cnts]
  IMG_START_DATE:  15260 TJD;    64 DOY;   10/03/05
  IMG_START_TIME:  32877.61 SOD {09:07:57.61} UT,   139.2 [sec] since BAT Trigger Time
  CENTROID_X:      284.52,  raw= 285  [pixels]
  CENTROID_Y:      294.56,  raw= 295  [pixels]
  ROLL:            4.14 [deg]
  GAIN:            1
  MODE:            3, Long Image mode
  WAVEFORM:        134
  EXPO_TIME:       2.50 [sec]
  GRB_POS_XRT_Y:   -8.10
  GRB_POS_XRT_Z:   -41.90
  IMAGE_URL:       sw00414905000msxps_rw.img
  SUN_POSTN:       345.89d {+23h 03m 34s}   -6.03d {-06d 01' 51"}
  SUN_DIST:        143.61 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
  MOON_POSTN:      223.88d {+14h 55m 31s}  -21.48d {-21d 29' 02"}
  MOON_DIST:        81.72 [deg]
  MOON_ILLUM:      73 [%]
  GAL_COORDS:      169.11, 64.90 [deg] galactic lon,lat of the burst
  ECL_COORDS:      150.76, 34.02 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Processed Image.  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 05 Mar 10 09:09:46 UT
  NOTICE_TYPE:     Swift-BAT GRB Lightcurve
  TRIGGER_NUM:     414905,   Seg_Num: 0
  GRB_RA:          168.365d {+11h 13m 28s} (J2000),
                   168.506d {+11h 14m 01s} (current),
                   167.672d {+11h 10m 41s} (1950)
  GRB_DEC:         +42.376d {+42d 22' 34"} (J2000),
                   +42.321d {+42d 19' 15"} (current),
                   +42.649d {+42d 38' 55"} (1950)
  GRB_DATE:        15260 TJD;    64 DOY;   10/03/05
  GRB_TIME:        32738.41 SOD {09:05:38.41} UT
  TRIGGER_INDEX:   20000
  GRB_PHI:         103.29 [deg]
  GRB_THETA:        34.45 [deg]
  DELTA_TIME:      0.00 [sec]
  TRIGGER_DUR:     64.000 [sec] 
  SOLN_STATUS:     0x13
  RATE_SIGNIF:     0.00 [sigma]
  IMAGE_SIGNIF:    8.24 [sigma]
  LC_URL:          sw00414905000msb.lc
  SUN_POSTN:       345.89d {+23h 03m 34s}   -6.03d {-06d 01' 50"}
  SUN_DIST:        143.64 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
  MOON_POSTN:      223.89d {+14h 55m 34s}  -21.49d {-21d 29' 10"}
  MOON_DIST:        81.71 [deg]
  MOON_ILLUM:      73 [%]
  GAL_COORDS:      169.17, 64.91 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      150.78, 33.99 [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 an image 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 = 315.90,15.91 [deg].  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 05 Mar 10 09:10:43 UT
  NOTICE_TYPE:     Swift-UVOT Source List
  TRIGGER_NUM:     414905,   Seg_Num: 0
  POINT_RA:        168.364d {+11h 13m 27s} (J2000)
  POINT_DEC:       +42.393d {+42d 23' 34"} (J2000)
  POINT_ROLL:      4.140d
  IMG_START_DATE:  15260 TJD;    64 DOY;   10/03/05
  IMG_START_TIME:  32882.54 SOD {09:08:02.54} UT,   144.1 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        2.336
  N_STARS:         40
  X_OFFSET:        368 [pixels]
  Y_OFFSET:        632 [pixels]
  X_MAX:           1327 [pixels]
  Y_MAX:           1591 [pixels]
  DET_THRESH:      13
  PHOTO_THRESH:    7
  SL_URL:          sw00414905000msufc0144.fits
  SUN_POSTN:       345.89d {+23h 03m 35s}   -6.03d {-06d 01' 49"}
  SUN_DIST:        143.62 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
  MOON_POSTN:      223.90d {+14h 55m 36s}  -21.49d {-21d 29' 18"}
  MOON_DIST:        81.73 [deg]
  MOON_ILLUM:      73 [%]
  GAL_COORDS:      169.14, 64.90 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      150.77, 34.01 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Source List.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 05 Mar 10 09:11:22 UT
  NOTICE_TYPE:     Swift-UVOT Processed Source List
  TRIGGER_NUM:     414905,   Seg_Num: 0
  POINT_RA:        168.364d {+11h 13m 27s} (J2000)
  POINT_DEC:       +42.393d {+42d 23' 34"} (J2000)
  POINT_ROLL:      4.140d
  IMG_START_DATE:  15260 TJD;    64 DOY;   10/03/05
  IMG_START_TIME:  32882.54 SOD {09:08:02.54} UT,   144.1 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        2.336
  N_STARS:         40
  X_OFFSET:        368 [pixels]
  Y_OFFSET:        632 [pixels]
  X_MAX:           1327 [pixels]
  Y_MAX:           1591 [pixels]
  DET_THRESH:      13
  PHOTO_THRESH:    7
  SL_URL:          sw00414905000msufc0144.fits
  SUN_POSTN:       345.89d {+23h 03m 35s}   -6.03d {-06d 01' 49"}
  SUN_DIST:        143.62 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
  MOON_POSTN:      223.91d {+14h 55m 37s}  -21.49d {-21d 29' 23"}
  MOON_DIST:        81.73 [deg]
  MOON_ILLUM:      73 [%]
  GAL_COORDS:      169.14, 64.90 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      150.77, 34.01 [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 05 Mar 10 09:13:08 UT
  NOTICE_TYPE:     Swift-UVOT Image
  TRIGGER_NUM:     414905,   Seg_Num: 0
  POINT_RA:        168.364d {+11h 13m 27s} (J2000)
  POINT_DEC:       +42.393d {+42d 23' 34"} (J2000)
  ROLL:            4.140d
  IMG_START_DATE:  15260 TJD;    64 DOY;   10/03/05
  IMG_START_TIME:  32882.54 SOD {09:08:02.54} UT,   144.1 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     289472888
  X_OFFSET:        859 [pixels]
  Y_OFFSET:        856 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       1019
  Y_GRB_POS:       1016
  BINNING_INDEX:   1
  IM_URL:          sw00414905000msuni0150.fits
  SUN_POSTN:       345.90d {+23h 03m 35s}   -6.03d {-06d 01' 47"}
  SUN_DIST:        143.62 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
  MOON_POSTN:      223.92d {+14h 55m 42s}  -21.49d {-21d 29' 38"}
  MOON_DIST:        81.74 [deg]
  MOON_ILLUM:      73 [%]
  GAL_COORDS:      169.14, 64.90 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      150.77, 34.01 [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 05 Mar 10 09:10:43 UT
  NOTICE_TYPE:     Swift-UVOT Source List
  TRIGGER_NUM:     414905,   Seg_Num: 0
  POINT_RA:        168.364d {+11h 13m 27s} (J2000)
  POINT_DEC:       +42.393d {+42d 23' 34"} (J2000)
  POINT_ROLL:      4.140d
  IMG_START_DATE:  15260 TJD;    64 DOY;   10/03/05
  IMG_START_TIME:  32882.54 SOD {09:08:02.54} UT,   144.1 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        2.336
  N_STARS:         40
  X_OFFSET:        368 [pixels]
  Y_OFFSET:        632 [pixels]
  X_MAX:           1327 [pixels]
  Y_MAX:           1591 [pixels]
  DET_THRESH:      13
  PHOTO_THRESH:    7
  SL_URL:          sw00414905000msufc0144.fits
  SUN_POSTN:       345.89d {+23h 03m 35s}   -6.03d {-06d 01' 49"}
  SUN_DIST:        143.62 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
  MOON_POSTN:      223.90d {+14h 55m 36s}  -21.49d {-21d 29' 18"}
  MOON_DIST:        81.73 [deg]
  MOON_ILLUM:      73 [%]
  GAL_COORDS:      169.14, 64.90 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      150.77, 34.01 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Source List.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 05 Mar 10 09:13:34 UT
  NOTICE_TYPE:     Swift-UVOT Processed Image
  TRIGGER_NUM:     414905,   Seg_Num: 0
  POINT_RA:        168.364d {+11h 13m 27s} (J2000)
  POINT_DEC:       +42.393d {+42d 23' 34"} (J2000)
  ROLL:            4.140d
  IMG_START_DATE:  15260 TJD;    64 DOY;   10/03/05
  IMG_START_TIME:  32882.54 SOD {09:08:02.54} UT,   144.1 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     289472888
  X_OFFSET:        859 [pixels]
  Y_OFFSET:        856 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       1019
  Y_GRB_POS:       1016
  BINNING_INDEX:   1
  IM_URL:          sw00414905000msuni0150.fits
  SUN_POSTN:       345.90d {+23h 03m 35s}   -6.03d {-06d 01' 47"}
  SUN_DIST:        143.62 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
  MOON_POSTN:      223.93d {+14h 55m 43s}  -21.50d {-21d 29' 42"}
  MOON_DIST:        81.75 [deg]
  MOON_ILLUM:      73 [%]
  GAL_COORDS:      169.14, 64.90 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      150.77, 34.01 [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 #10470
  E. Troja (NASA/GSFC/ORAU), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), S. Campana (INAF-OAB), J. R. Cummings (NASA/UMBC), A. de Ugarte Postigo (INAF-OAB), P. A. Evans (U Leicester), J. M. Gelbord (PSU), O. Godet (U Leicester), C. Guidorzi (U Ferrara), S. T. Holland (CRESST/USRA/GSFC), H. A. Krimm (CRESST/GSFC/USRA), R. Margutti (Univ Bicocca&OAB), C. Pagani (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), B. Sbarufatti (INAF-OAB/IASFPA), M. H. Siegel (PSU) and R. L. C. Starling (U Leicester) report on behalf of the Swift Team:
  At 09:05:38 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 100305A (trigger=414905). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 168.365, +42.376 which is

     RA(J2000) = 11h 13m 28s
     Dec(J2000) = +42d 22' 34"
  

  with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a total duration of about 20 sec, starting at ~T+50 relative to the start of the image trigger interval. The peak count rate was ~500 counts/sec (15-350 keV), at ~65 sec after the trigger.
  The XRT began observing the field at 09:07:57.6 UT, 139.2 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 168.36762, 42.40281 which is equivalent to:

     RA(J2000)  = 11h 13m 28.23s
     Dec(J2000) = +42d 24' 10.1"
  

  with an uncertainty of 4.4 arcseconds (radius, 90% containment). This location is 96 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time.
  A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 2.14e+20 cm^-2 (Kalberla et al. 2005).
  The initial flux in the 2.5 s image was 4.86e-10 erg cm^-2 s^-1 (0.2-10 keV).
  UVOT took a finding chart exposure of 122 seconds with the White filter starting 144 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 0.01.
  Burst Advocate for this burst is E. Troja (eleonora.troja AT nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 05 Mar 10 09:25:58 UT
  NOTICE_TYPE:     Swift-XRT Position UPDATE
  TRIGGER_NUM:     414905,   Seg_Num: 0
  GRB_RA:          168.3676d {+11h 13m 28.22s} (J2000),
                   168.5083d {+11h 14m 01.99s} (current),
                   167.6741d {+11h 10m 41.77s} (1950)
  GRB_DEC:         +42.4028d {+42d 24' 10.0"} (J2000),
                   +42.3473d {+42d 20' 50.3"} (current),
                   +42.6751d {+42d 40' 30.5"} (1950)
  GRB_ERROR:       4.4 [arcsec radius, statistical plus systematic, 90% containment]
  GRB_INTEN:       1.00e-10 [erg/cm2/sec]
  GRB_SIGNIF:      10.00 [sigma]
  IMG_START_DATE:  15260 TJD;    64 DOY;   10/03/05
  IMG_START_TIME:  32965.00 SOD {09:09:25.00} UT,   226.6 [sec] since BAT Trigger Time
  TAM[0-3]:        100.00 100.00 100.00 100.00
  AMPLIFIER:       1
  WAVEFORM:        31
  SUN_POSTN:       345.90d {+23h 03m 37s}   -6.03d {-06d 01' 35"}
  SUN_DIST:        143.61 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
  MOON_POSTN:      224.05d {+14h 56m 11s}  -21.52d {-21d 31' 24"}
  MOON_DIST:        81.84 [deg]
  MOON_ILLUM:      73 [%]
  GAL_COORDS:      169.11, 64.90 [deg] galactic lon,lat of the burst
  ECL_COORDS:      150.76, 34.02 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Coordinates.  
  COMMENTS:        This Notice was ground-generated -- not flight-generated.  
  COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
  COMMENTS:        TAM values, flux and significance fields are not valid.  
  COMMENTS:        This position was automatically generated on the ground using  
  COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
  COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
  COMMENTS:        The probability that this is a serendipitous source in the  
  COMMENTS:        SPER window is 0.11% < P(seren) < 0.58%.  
  

• GCN Circular #10471
  S. B. Cenko (UC Berkeley) reports on behalf of a larger collaboration:
  We have imaged the field of GRB100305A (Troja et al., GCN 10470) with the automated Palomar 60-inch telescope. Images were obtained in the Sloan g', r', i', and z' filters beginning at 09:09 UT on 5 March 2010 (~ 3.5 minutes after the burst).
  In coadded images, we find no sources inside the XRT error circle to the following limits (calculated with respect several point sources in the SDSS DR7 catalog):

  Filter		Mid-point	t_burst		Exposure	Magnitude
  -------------------------------------------------------------------------
  r'		09:25		19.5 min	720.0		> 22.0
  z'		09:27		21.7 min	420.0		> 20.5
  i'		09:28		23.3 min	660.0		> 22.0
  
  
  The lack of an optical afterglow candidate, together with the long
  duration and lack of X-ray absorption in excess of the Galactic value
  (Troja et al., GCN 10470), make GRB100305A a candidate high redshift
  event.  We encourage additional follow-up at longer wavelengths.
  

• GCN Circular #10472
  A. N. Morgan, J. S. Bloom, and S. B. Cenko (UC Berkeley) report:
  We observed the field of GRB 100305A (Troja et al., GCN 10470) with the 1.3m PAIRITEL located at Mt. Hopkins, Arizona. Observations began at 2010-03-05 09h29m30s UT, ~0.4 hours after the Swift trigger. =A0In initial mosaics (effective exposure time of ~795.6 seconds) taken simultaneously in the J, H, and Ks filters, we do not detect any sources within the XRT error circle.
  The preliminary photometry yields:

  post_burst
  t_mid(min) =A0exp(s) =A0filt =A0 =A0U. Limit (3 sig)
  34.6 =A0 =A0 =A0 =A0795.6  =A0J =A0 =A0 =A0 > 19.2
  34.6 =A0 =A0 =A0 =A0795.6  =A0H =A0 =A0 =A0 > 18.0
  34.6 =A0 =A0 =A0 =A0795.6 =A0 Ks =A0 =A0 =A0> 17.3
  

  Observations are ongoing. =A0All magnitudes given in the Vega system, calibrated to 2MASS. =A0No correction for Galactic extinction has been made to the above reported values.
• GCN Circular #10473
  A. Cucchiara (PSU), report on behalf of a larger collaboration:
  "On March 5.42 UT we observed the field of GRB 100305A (Troja et al., GCN 10470) with the Gemini-N telescope and the GMOS instrument.
  In our 300s r'-band and 900s i'-band images we clearly detect a source inside the XRT error circle at the following position:

  RA (J2000) = 11:13:28.30
  Dec (J2000) = 42:24:10.50
  

  with an uncertainty of 0.5" in each coordinate.
  Using 2 USNO-B1 stars we calibrated our photometry and obtained

  r' = 23.95 +- 0.30 mag
  i' = 23.71 +- 0.50 mag
  

  At the moment no evidence of fading can be addressed. Further analysis are in progress.
  We thank the Gemini staff for performing this observation, in particular Andrew Stephens."
• GCN Circular #10474
  J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
  Using 2448 s of XRT Photon Counting mode data and 6 UVOT images for GRB 100305A, 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 = 168.36691, +42.40393 which is equivalent to:

  RA (J2000): 11h 13m 28.06s
  Dec (J2000): +42d 24' 14.1"
  

  with an uncertainty of 1.7 arcsec (radius, 90% confidence).
  This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
  This circular was automatically generated, and is an official product of the Swift-XRT team.
• GCN Circular #10475
  A. Henden (AAVSO), J. Gross (SRO), B. Denny (DC-3), D. Terrell (SwRI), and W. Cooney (SRO) report:
  We obtained imagery of the GRB 100305A burst reported by Troja et al. (GCN 10470) using the Sonoita Research Observatory (SRO) 35cm telescope in southern Arizona, utilizing an automatic VOevent trigger. The exposures began about 3 minutes after the burst and continued for approximately two hours. 20 Rc-band, 10 V-band, and a set of BVRI exposures for field calibration were acquired. Inspection of the enhanced Swift-XRT position given by Osborne, et al. (GCN 10474) does not show any optical afterglow to the following limits, based on using star USNOB 1323-0268523 at 11:13:38.45 +42:23:45.7 as having magnitudes R=15.98 and V=16.67):

  UTmid     delT    exp   filt  lim
  (hrs)     (min)  (# x s)
  09.1544  003.63  01x060  Rc  19.1
  09.2379  008.64  10x060  Rc  20.5
  09.4821  023.29  05x180  Rc  21.3
  09.8411  044.83  05x300  Rc  21.6
  10.8564  105.75  10x300  V   21.1
  

  The AAVSO thanks the Curry Foundation for its support of the AAVSO International High Energy Network.
• GCN Circular #10476
  A. de Ugarte Postigo, R. Margutti, B. Sbarufatti (INAF-OAB) and E. Troja (NASA/GSFC/ORAU) report on behalf of the Swift-XRT team:
  We have analysed 2.5 ks of the Swift-XRT data for GRB 100305A (Troja et al. GCN Circ. 10470), from 145 s to 6.0 ks after the BAT trigger. The data comprise 84 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode.
  The best position of the X-ray afterglow is the UVOT enhanced XRT position given in Osborne et al. (GCN Circ. 10474).
  Analysis of the light curve shows an initial steep power-law decay with an index of alpha=3.5 (+/-0.4), followed by a break at T+300 s to an alpha of 0.84 (+0.11, -0.58).
  A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.96 (+0.21,-0.20). The best-fitting absorption column is 1.7 (+/-0.5) x 10^21 cm^-2, in excess of the Galactic value of 2.1 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 2.14 (+0.24,-0.20) and a best-fitting absorption column of 1.7 (+0.60, -0.30) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.8 x 10^-11 (5.8 x 10^-11) erg cm^-2 count^-1.
  If the light curve continues to decay with a power-law decay index of 0.84, the count rate at T+24 hours will be 0.015 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 5.8 x 10^-13 (8.7 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/00414905.
  This circular is an official product of the Swift-XRT team.
• GCN Circular #10477
  M. H. Siegel (PSU) and E. Troja (NASA/GSFC/ORAU) report on behalf of the Swift/UVOT team.
  The Swift/UVOT began settled observations of the field of GRB 100305A 144s after the BAT trigger (Troja et al., GCN Circ. 10470). Data summed from the first and second orbits do not reveal a source at the enhanced position of the X-ray afterglow (Osborne et al., GCN Circ. 10474) or the candidate afterglow reported by Cucchiara et al. (GCN Circ. 10473).
  The 3-sigma upper limits for the finding chart (fc) and summed exposures are reported below:

  FILTER     T_start(s)  T_stop    Exposure     Mag/3UL
  ========================================================
  white fc      144        266        120       > 20.60
  white        4636       4836        196       > 21.10
  v            3612       5247        393       > 19.85
  b            4432       6048        373       > 20.68
  u            4227       5863        393       > 20.45
  uvw1         4022       5656        393       > 20.46
  uvm2         3817       5451        393       > 20.2
  uvw2         4842       5042        196       > 20.17
  =======================================================
  

  The above magnitudes are not corrected for the Galactic extinction corresponding to a reddening of E_{B-V} = 0.01 (Schlegel et al., 1998, ApJS, 500, 525). The photometry is on the UVOT photometric system described in Poole et al. (2008, MNRAS, 383, 627).
• GCN Circular #10478
  A. Cucchiara (PSU), report on behalf of a larger collaboration:
  "We continued our observations of GRB 100305A with the Gemini-N telescope mounted with the GMOS camera. A sequence of z'-band images has been taken for a total exposure time of 15 min.
  No clear object is visible in the position of the optical afterglow previously reported (GCN 10473) at the following 3-sigma upper limit:
  z' > 23.42 mag
  We also report a corrected error measure in our photometry. The correct magnitude estimates at T0 + 2h are:

  r' = 23.95 +- 0.30 mag
  i' = 23.71 +- 0.06 mag
  

  We apologize for any inconvenience this may have caused."
• GCN Circular #10479
  H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), A. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), E. Troja (NASA/GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
  Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 100305A (trigger #414905) (Troja, et al., GCN Circ. 10470). The BAT ground-calculated position is RA, Dec = 168.373, 42.381 deg which is

      RA(J2000)  =  11h 13m 29.5s
      Dec(J2000) = +42d 22' 50.7"
  

  with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 22%.
  The mask-weighted light curve shows a broad structure of two overlapping peaks beginning at T+0 and continuing to T+80 sec with the highest peak at T+60 sec. There is soft, low-level emission extending to ~T+200 sec. T90 (15-350 keV) is 69.7 +- 8.7 sec (estimated error including systematics).
  The time-averaged spectrum from T-9.2 to T+70.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.27 +- 0.23. The fluence in the 15-150 keV band is 1.5 +- 0.2 x 10^-6 erg/cm^2. The 1-sec peak photon flux measured from T+62.72 sec in the 15-150 keV band is 0.9 +- 0.3 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/414905/BA/
• GCN Circular #10481
  Adria C. Updike (Clemson University), Peter A. Milne (Steward Observatory), G. Grant Williams (MMTO), and Dieter H. Hartmann (Clemson University) report:
  We observed the field of GRB 100305A (Troja et al., GCN 10470) with the 0.6m Super-LOTIS telescope located at Kitt Peak National Observatory beginning 106 seconds after the trigger. Observations were carried out in the R band for approximately 45 minutes under good conditions. We do not detect any sources within the XRT enhanced error circle (Osborne et al., GCN 10474) or the source detected by Gemini-N (Cucchiara, GCN 10473).

  Band  Exptime  co-adds  time    UL
  -------------------------------------
  R      10        5      106    > 17.5
  R      20        5      202    > 19.2
  R      60       30      389    > 20.5
  

  Exptime is given in seconds; time is seconds after trigger of first observation. All limits given relative to USNO B1.0 field stars.
• GCN Circular #10482
  D. Kuroda (OAO, NAOJ), H. Hanayama, T. Miyaji, J. Watanabe(IAO, NAOJ), K. Yanagisawa (OAO, NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of the MITSuME collaboration:
  We observed the field of GRB 100305A (Troja et al. GCNC 10470) with the optical three color (g', Rc and Ic) CCD camera attached to the Murikabushi 1m telescope of Ishigakijima Astronomical Observatory.
  The observation started on 2010-03-05 13:03:55 UT (~4h after the burst). We did not find any new point source in the XRT error circle (Osborne et al., GCNC 10474) in all the three bands.
  Three sigma upper limits of the OT are listed below. We used SDSS catalog for flux calibration.

  T0+[day]   MID-UT   T-EXP[sec]    g'     Rc     Ic
  ------------------------------------------------------
  0.18816    13:36:35  3300.0      >22.1  >21.6  >20.4
  ------------------------------------------------------
  T0+ : Elapsed time after the burst [day]
  T-EXP: Total Exposure time [sec]
  

• GCN Report 274.1
  GCN_Report 274.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_274_1.pdf by E. Troja at NASA/GSFC/ORAU titled: "Final Swift Observations of GRB 100305A"
• arXiv:1504.02482 due to low excess X-ray column possibly high-z
  proposed optical counterpart of Cucchiara is outside final XRT error circle, and still visible in late Keck images, so likely not the counterpart