Gamma-ray Burst 130131B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Thu 31 Jan 13 19:10:37 UT
  NOTICE_TYPE:     Swift-BAT GRB Position
  TRIGGER_NUM:     547420,   Seg_Num: 0
  GRB_RA:          173.952d {+11h 35m 48s} (J2000),
                   174.121d {+11h 36m 29s} (current),
                   173.303d {+11h 33m 13s} (1950)
  GRB_DEC:         +15.036d {+15d 02' 08"} (J2000),
                   +14.963d {+14d 57' 47"} (current),
                   +15.312d {+15d 18' 44"} (1950)
  GRB_ERROR:       3.00 [arcmin radius, statistical only]
  GRB_INTEN:       9163 [cnts]    Image_Peak=270 [image_cnts]
  TRIGGER_DUR:     2.048 [sec] 
  TRIGGER_INDEX:   262     E_range: 25-100 keV
  BKG_INTEN:       87589 [cnts]
  BKG_TIME:        68973.83 SOD {19:09:33.83} UT
  BKG_DUR:         24 [sec]
  GRB_DATE:        16323 TJD;    31 DOY;   13/01/31
  GRB_TIME:        69008.90 SOD {19:10:08.90} UT
  GRB_PHI:          28.11 [deg]
  GRB_THETA:        33.12 [deg]
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     16.73 [sigma]
  IMAGE_SIGNIF:    7.85 [sigma]
  MERIT_PARAMS:     +1  +0  +0  +1  +2  -2  +0  +0 +79  +0 
  SUN_POSTN:       314.54d {+20h 58m 10s}  -17.17d {-17d 10' 11"}
  SUN_DIST:        141.97 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
  MOON_POSTN:      184.91d {+12h 19m 38s}   -6.06d {-06d 03' 18"}
  MOON_DIST:        23.58 [deg]
  MOON_ILLUM:      79 [%]
  GAL_COORDS:      243.62, 68.66 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      168.43, 11.39 [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 = 161.65,15.06 [deg].
  

• red DSS finding chart ps-file
  
  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Thu 31 Jan 13 19:12:16 UT
  NOTICE_TYPE:     Swift-XRT Nack-Position
  TRIGGER_NUM:     547420,   Seg_Num: 0
  POINT_RA:        173.936d {+11h 35m 45s} (J2000)
  POINT_DEC:       +15.037d {+15d 02' 12"} (J2000)
  IMG_START_DATE:  16323 TJD;    31 DOY;   13/01/31
  IMG_START_TIME:  69118.36 SOD {19:11:58.36} UT,   109.5 [sec] since BAT Trigger Time
  COUNTS:          4    Min_needed= 20
  STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
  PH2_ITER:        1    Max_iter_allowed= 4
  ERROR_CODE:      1
  COMMENTS:        SWIFT-XRT Nack Position.  
  COMMENTS:        No source found in the image.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Thu 31 Jan 13 19:14:06 UT
  NOTICE_TYPE:     Swift-BAT GRB Lightcurve
  TRIGGER_NUM:     547420,   Seg_Num: 0
  GRB_RA:          173.952d {+11h 35m 48s} (J2000),
                   174.121d {+11h 36m 29s} (current),
                   173.303d {+11h 33m 13s} (1950)
  GRB_DEC:         +15.036d {+15d 02' 08"} (J2000),
                   +14.963d {+14d 57' 47"} (current),
                   +15.312d {+15d 18' 44"} (1950)
  GRB_DATE:        16323 TJD;    31 DOY;   13/01/31
  GRB_TIME:        69008.90 SOD {19:10:08.90} UT
  TRIGGER_INDEX:   262
  GRB_PHI:          28.11 [deg]
  GRB_THETA:        33.12 [deg]
  DELTA_TIME:      12.00 [sec]
  TRIGGER_DUR:     2.048 [sec] 
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     16.73 [sigma]
  IMAGE_SIGNIF:    7.85 [sigma]
  LC_URL:          sw00547420000msb.lc
  SUN_POSTN:       314.55d {+20h 58m 11s}  -17.17d {-17d 10' 09"}
  SUN_DIST:        141.97 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
  MOON_POSTN:      184.94d {+12h 19m 46s}   -6.07d {-06d 03' 57"}
  MOON_DIST:        23.61 [deg]
  MOON_ILLUM:      79 [%]
  GAL_COORDS:      243.62, 68.66 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      168.43, 11.39 [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 = 161.65,15.06 [deg].
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Thu 31 Jan 13 19:15:00 UT
  NOTICE_TYPE:     Swift-UVOT Source List
  TRIGGER_NUM:     547420,   Seg_Num: 0
  POINT_RA:        173.936d {+11h 35m 45s} (J2000)
  POINT_DEC:       +15.037d {+15d 02' 12"} (J2000)
  POINT_ROLL:      98.778d
  IMG_START_DATE:  16323 TJD;    31 DOY;   13/01/31
  IMG_START_TIME:  69122.81 SOD {19:12:02.81} UT,   113.9 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        2.584
  N_STARS:         17
  X_OFFSET:        580 [pixels]
  Y_OFFSET:        503 [pixels]
  X_MAX:           1539 [pixels]
  Y_MAX:           1462 [pixels]
  DET_THRESH:      13
  PHOTO_THRESH:    7
  SL_URL:          sw00547420000msufc0113.fits
  SUN_POSTN:       314.55d {+20h 58m 11s}  -17.17d {-17d 10' 08"}
  SUN_DIST:        141.98 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
  MOON_POSTN:      184.95d {+12h 19m 47s}   -6.07d {-06d 04' 08"}
  MOON_DIST:        23.62 [deg]
  MOON_ILLUM:      79 [%]
  GAL_COORDS:      243.59, 68.65 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      168.42, 11.39 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Source List.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Thu 31 Jan 13 19:15:25 UT
  NOTICE_TYPE:     Swift-UVOT Processed Source List
  TRIGGER_NUM:     547420,   Seg_Num: 0
  POINT_RA:        173.936d {+11h 35m 45s} (J2000)
  POINT_DEC:       +15.037d {+15d 02' 12"} (J2000)
  POINT_ROLL:      98.778d
  IMG_START_DATE:  16323 TJD;    31 DOY;   13/01/31
  IMG_START_TIME:  69122.81 SOD {19:12:02.81} UT,   113.9 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        2.584
  N_STARS:         17
  X_OFFSET:        580 [pixels]
  Y_OFFSET:        503 [pixels]
  X_MAX:           1539 [pixels]
  Y_MAX:           1462 [pixels]
  DET_THRESH:      13
  PHOTO_THRESH:    7
  SL_URL:          sw00547420000msufc0113.fits
  SUN_POSTN:       314.55d {+20h 58m 11s}  -17.17d {-17d 10' 08"}
  SUN_DIST:        141.99 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
  MOON_POSTN:      184.95d {+12h 19m 48s}   -6.07d {-06d 04' 12"}
  MOON_DIST:        23.62 [deg]
  MOON_ILLUM:      79 [%]
  GAL_COORDS:      243.59, 68.65 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      168.42, 11.39 [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 31 Jan 13 19:16:29 UT
  NOTICE_TYPE:     Swift-UVOT Image
  TRIGGER_NUM:     547420,   Seg_Num: 0
  POINT_RA:        173.936d {+11h 35m 45s} (J2000)
  POINT_DEC:       +15.037d {+15d 02' 12"} (J2000)
  ROLL:            98.778d
  IMG_START_DATE:  16323 TJD;    31 DOY;   13/01/31
  IMG_START_TIME:  69122.81 SOD {19:12:02.81} UT,   113.9 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     381352332
  X_OFFSET:        899 [pixels]
  Y_OFFSET:        822 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       1059
  Y_GRB_POS:       982
  BINNING_INDEX:   1
  IM_URL:          sw00547420000msuni0124.fits
  SUN_POSTN:       314.55d {+20h 58m 11s}  -17.17d {-17d 10' 07"}
  SUN_DIST:        141.99 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
  MOON_POSTN:      184.96d {+12h 19m 51s}   -6.07d {-06d 04' 24"}
  MOON_DIST:        23.63 [deg]
  MOON_ILLUM:      79 [%]
  GAL_COORDS:      243.59, 68.65 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      168.42, 11.39 [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 31 Jan 13 19:16:42 UT
  NOTICE_TYPE:     Swift-UVOT Processed Image
  TRIGGER_NUM:     547420,   Seg_Num: 0
  POINT_RA:        173.936d {+11h 35m 45s} (J2000)
  POINT_DEC:       +15.037d {+15d 02' 12"} (J2000)
  ROLL:            98.778d
  IMG_START_DATE:  16323 TJD;    31 DOY;   13/01/31
  IMG_START_TIME:  69122.81 SOD {19:12:02.81} UT,   113.9 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     381352332
  X_OFFSET:        899 [pixels]
  Y_OFFSET:        822 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       1059
  Y_GRB_POS:       982
  BINNING_INDEX:   1
  IM_URL:          sw00547420000msuni0124.fits
  SUN_POSTN:       314.55d {+20h 58m 11s}  -17.17d {-17d 10' 07"}
  SUN_DIST:        141.99 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
  MOON_POSTN:      184.96d {+12h 19m 51s}   -6.07d {-06d 04' 27"}
  MOON_DIST:        23.63 [deg]
  MOON_ILLUM:      79 [%]
  GAL_COORDS:      243.59, 68.65 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      168.42, 11.39 [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 NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Thu 31 Jan 13 19:16:46 UT
  NOTICE_TYPE:     Swift-XRT Position
  TRIGGER_NUM:     547420,   Seg_Num: 0
  GRB_RA:          173.9539d {+11h 35m 48.93s} (J2000),
                   174.1236d {+11h 36m 29.66s} (current),
                   173.3050d {+11h 33m 13.20s} (1950)
  GRB_DEC:         +15.0387d {+15d 02' 19.3"} (J2000),
                   +14.9662d {+14d 57' 58.4"} (current),
                   +15.3154d {+15d 18' 55.3"} (1950)
  GRB_ERROR:       3.8 [arcsec radius, statistical plus systematic, 90% containment]
  GRB_INTEN:       1.00e-10 [erg/cm2/sec]
  GRB_SIGNIF:      10.00 [sigma]
  IMG_START_DATE:  16323 TJD;    31 DOY;   13/01/31
  IMG_START_TIME:  69134.00 SOD {19:12:14.00} UT,   125.1 [sec] since BAT Trigger Time
  TAM[0-3]:        100.00 100.00 100.00 100.00
  AMPLIFIER:       1
  WAVEFORM:        31
  SUN_POSTN:       314.55d {+20h 58m 11s}  -17.17d {-17d 10' 07"}
  SUN_DIST:        141.97 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
  MOON_POSTN:      184.96d {+12h 19m 51s}   -6.07d {-06d 04' 27"}
  MOON_DIST:        23.63 [deg]
  MOON_ILLUM:      79 [%]
  GAL_COORDS:      243.62, 68.66 [deg] galactic lon,lat of the burst
  ECL_COORDS:      168.43, 11.40 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Coordinates.  
  COMMENTS:        This Notice was ground-generated -- not flight-generated.  
  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 0.58% < P(seren) < 1.1%.  
  

• GCN Circular #14159
  M. H. Siegel (PSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), D. N. Burrows (PSU), J. R. Cummings (NASA/UMBC), S. T. Holland (STScI), J. A. Kennea (PSU), K. L. Page (U Leicester), D. M. Palmer (LANL), B. Sbarufatti (INAF-OAB/PSU) and B.-B. Zhang (PSU) report on behalf of the Swift Team:
  At 19:10:08 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 130131B (trigger=547420). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 173.952, +15.036 which is

     RA(J2000)  =  11h 35m 48s
     Dec(J2000) = +15d 02' 08"
  

  with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows two peaks with a total duration of about 5 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~4 sec after the trigger.
  The XRT began observing the field at 19:11:58.3 UT, 109.5 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source located at RA, Dec 173.95398, 15.03873 which is equivalent to:

     RA(J2000)  = 11h 35m 48.96s
     Dec(J2000) = +15d 02' 19.4"
  

  with an uncertainty of 3.8 arcseconds (radius, 90% containment). This location is 11 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.
  A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (2.81 x 10^20 cm^-2, Kalberla et al. 2005), with an excess column of 2.8 (+2.32/-2.04) x 10^21 cm^-2 (90% confidence).
  UVOT took a finding chart exposure of 150 seconds with the White filter starting 113 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.03.
  Burst Advocate for this burst is M. H. Siegel (siegel AT swift.psu.edu). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Thu 31 Jan 13 19:23:00 UT
  NOTICE_TYPE:     Swift-UVOT Source List
  TRIGGER_NUM:     547420,   Seg_Num: 0
  POINT_RA:        173.935d {+11h 35m 44s} (J2000)
  POINT_DEC:       +15.039d {+15d 02' 20"} (J2000)
  POINT_ROLL:      98.775d
  IMG_START_DATE:  16323 TJD;    31 DOY;   13/01/31
  IMG_START_TIME:  69336.20 SOD {19:15:36.20} UT,   327.3 [sec] since BAT Trigger Time
  FILTER:          7, U
  BKG_MEAN:        1.756
  N_STARS:         17
  X_OFFSET:        340 [pixels]
  Y_OFFSET:        263 [pixels]
  X_MAX:           1779 [pixels]
  Y_MAX:           1702 [pixels]
  DET_THRESH:      11
  PHOTO_THRESH:    5
  SL_URL:          sw00547420000msufc0327.fits
  SUN_POSTN:       314.55d {+20h 58m 12s}  -17.17d {-17d 10' 02"}
  SUN_DIST:        141.99 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
  MOON_POSTN:      185.02d {+12h 20m 04s}   -6.09d {-06d 05' 38"}
  MOON_DIST:        23.68 [deg]
  MOON_ILLUM:      79 [%]
  GAL_COORDS:      243.59, 68.65 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      168.42, 11.39 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Source List.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Thu 31 Jan 13 19:23:18 UT
  NOTICE_TYPE:     Swift-UVOT Processed Source List
  TRIGGER_NUM:     547420,   Seg_Num: 0
  POINT_RA:        173.935d {+11h 35m 44s} (J2000)
  POINT_DEC:       +15.039d {+15d 02' 20"} (J2000)
  POINT_ROLL:      98.775d
  IMG_START_DATE:  16323 TJD;    31 DOY;   13/01/31
  IMG_START_TIME:  69336.20 SOD {19:15:36.20} UT,   327.3 [sec] since BAT Trigger Time
  FILTER:          7, U
  BKG_MEAN:        1.756
  N_STARS:         17
  X_OFFSET:        340 [pixels]
  Y_OFFSET:        263 [pixels]
  X_MAX:           1779 [pixels]
  Y_MAX:           1702 [pixels]
  DET_THRESH:      11
  PHOTO_THRESH:    5
  SL_URL:          sw00547420000msufc0327.fits
  SUN_POSTN:       314.55d {+20h 58m 12s}  -17.17d {-17d 10' 02"}
  SUN_DIST:        141.99 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
  MOON_POSTN:      185.02d {+12h 20m 05s}   -6.10d {-06d 05' 41"}
  MOON_DIST:        23.68 [deg]
  MOON_ILLUM:      79 [%]
  GAL_COORDS:      243.59, 68.65 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      168.42, 11.39 [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 31 Jan 13 19:24:15 UT
  NOTICE_TYPE:     Swift-UVOT Image
  TRIGGER_NUM:     547420,   Seg_Num: 0
  POINT_RA:        173.935d {+11h 35m 44s} (J2000)
  POINT_DEC:       +15.039d {+15d 02' 20"} (J2000)
  ROLL:            98.775d
  IMG_START_DATE:  16323 TJD;    31 DOY;   13/01/31
  IMG_START_TIME:  69336.20 SOD {19:15:36.20} UT,   327.3 [sec] since BAT Trigger Time
  FILTER:          7, U
  EXPOSURE_ID:     381352546
  X_OFFSET:        899 [pixels]
  Y_OFFSET:        822 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       1059
  Y_GRB_POS:       982
  BINNING_INDEX:   1
  IM_URL:          sw00547420000msuni0338.fits
  SUN_POSTN:       314.55d {+20h 58m 13s}  -17.17d {-17d 10' 02"}
  SUN_DIST:        141.99 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
  MOON_POSTN:      185.03d {+12h 20m 07s}   -6.10d {-06d 05' 52"}
  MOON_DIST:        23.68 [deg]
  MOON_ILLUM:      79 [%]
  GAL_COORDS:      243.59, 68.65 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      168.42, 11.39 [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 31 Jan 13 19:24:38 UT
  NOTICE_TYPE:     Swift-UVOT Processed Image
  TRIGGER_NUM:     547420,   Seg_Num: 0
  POINT_RA:        173.935d {+11h 35m 44s} (J2000)
  POINT_DEC:       +15.039d {+15d 02' 20"} (J2000)
  ROLL:            98.775d
  IMG_START_DATE:  16323 TJD;    31 DOY;   13/01/31
  IMG_START_TIME:  69336.20 SOD {19:15:36.20} UT,   327.3 [sec] since BAT Trigger Time
  FILTER:          7, U
  EXPOSURE_ID:     381352546
  X_OFFSET:        899 [pixels]
  Y_OFFSET:        822 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       1059
  Y_GRB_POS:       982
  BINNING_INDEX:   1
  IM_URL:          sw00547420000msuni0338.fits
  SUN_POSTN:       314.55d {+20h 58m 13s}  -17.17d {-17d 10' 01"}
  SUN_DIST:        141.99 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
  MOON_POSTN:      185.03d {+12h 20m 08s}   -6.10d {-06d 05' 56"}
  MOON_DIST:        23.69 [deg]
  MOON_ILLUM:      79 [%]
  GAL_COORDS:      243.59, 68.65 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      168.42, 11.39 [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:        If you have elected to receive attachments:  
  COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Thu 31 Jan 13 19:25:12 UT
  NOTICE_TYPE:     Swift-XRT Position UPDATE
  TRIGGER_NUM:     547420,   Seg_Num: 0
  GRB_RA:          173.9553d {+11h 35m 49.27s} (J2000),
                   174.1250d {+11h 36m 29.99s} (current),
                   173.3064d {+11h 33m 13.53s} (1950)
  GRB_DEC:         +15.0381d {+15d 02' 17.1"} (J2000),
                   +14.9656d {+14d 57' 56.3"} (current),
                   +15.3148d {+15d 18' 53.2"} (1950)
  GRB_ERROR:       2.2 [arcsec radius, statistical plus systematic, 90% containment]
  GRB_INTEN:       1.00e-10 [erg/cm2/sec]
  GRB_SIGNIF:      10.00 [sigma]
  IMG_START_DATE:  16323 TJD;    31 DOY;   13/01/31
  IMG_START_TIME:  69134.00 SOD {19:12:14.00} UT,   125.1 [sec] since BAT Trigger Time
  TAM[0-3]:        100.00 100.00 100.00 100.00
  AMPLIFIER:       1
  WAVEFORM:        31
  SUN_POSTN:       314.55d {+20h 58m 13s}  -17.17d {-17d 10' 01"}
  SUN_DIST:        141.97 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
  MOON_POSTN:      185.04d {+12h 20m 09s}   -6.10d {-06d 06' 02"}
  MOON_DIST:        23.68 [deg]
  MOON_ILLUM:      79 [%]
  GAL_COORDS:      243.62, 68.66 [deg] galactic lon,lat of the burst
  ECL_COORDS:      168.44, 11.40 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Coordinates.  
  COMMENTS:        This Notice was ground-generated -- not flight-generated.  
  COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
  COMMENTS:        TAM values, flux and significance fields are not valid.  
  COMMENTS:        This position was automatically generated on the ground using  
  COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
  COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
  COMMENTS:        This position was enhanced using UVOT field astrometry.  
  COMMENTS:        The probability that this is a serendipitous source in the  
  COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.  
  

• GCN Circular #14161
  A. Klotz (IRAP-CNRS-OMP), D. Macpherson (UWA/ICRAR), D. Coward (UWA), B. Gendre (IRAP-CNRS-OMP), M. Boer, K. Siellez, H. Dereli , O. Bardho (UNS-CNRS-OCA), A. Williams (PO-UWA), R. Martin (PO-UWA) report:
  We imaged the field of GRB 130131B detected by SWIFT (trigger 547420) with the Zadko robotic telescope (D=100cm) located at the observatory - Gingin, Australia.
  The observations started 70.2s after the GRB trigger (43.4s after the notice). The elevation of the field decreased from 43 degrees above horizon but gibbous moon was at 23 degrees away from the GRB position.
  The first image is trailed with a duration of 60.0s (see the description in Klotz et al., 2006, A&A 451, L39). We do not detect any OT at the XRT position (Siegel et al. GCNC 14159) with a limiting magnitude of: t0+70.2s to t0+130.2s : R > 15.6
  The second image is 30.0s exposure in tracking mode: t0+149s to t0+179s : R > 16.5
  An image follow-up continued until 1.5h after the GRB showing no optical transcient at the limiting magnitude 16.5. The gibbous moon prevents to obtain deeper limiting magnitudes.
  Magnitudes were estimated with the nearby NOMAD1 stars and are not corrected for galactic dust extinction.
• GCN Circular #14162
  Klotz A. (IRAP-CNRS-OMP), Gendre B. (IRAP-CNRS-OMP), Boer M., Siellez K., Dereli H., Bardho O. (UNS-CNRS-OCA), Atteia J.L. (IRAP-CNRS-OMP) report:
  We imaged the field of GRB 130131B detected by SWIFT (trigger 547420) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France.
  The observations started 1.2h after the GRB trigger because the GRB occured when the field of view was under the local horizon. At the start of the observations, the elevation of the field increased from 10 degrees above horizon and gibbous moon was at 25 degrees away from the GRB position.
  We co-added a series of exposures. No optical transcient was detected at the XRT position (Siegel et al. GCNC 14159) with a limiting magnitude of: t0+1.3h - 2.2h : R > 17.1
  Magnitudes were estimated with the nearby NOMAD1 stars and are not corrected for galactic dust extinction.
• GCN Circular #14164
  T. Sakamoto (AGU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Lien (GSFC/ORAU), C. B. Markwardt (GSFC), D. M. Palmer (LANL), G. Sato (ISAS), M. H. Siegel (PSU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
  Using the data set from T-119 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 130131B (trigger #547420) (Siegel, et al., GCN Circ. 14159). The BAT ground-calculated position is RA, Dec = 173.957, 15.033 deg which is

     RA(J2000)  =  11h 35m 49.6s 
     Dec(J2000) = +15d 01' 59.3" 
  

  with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 51%.
  The mask-weighted light curve shows a single pulse starting at ~T-1 sec, peaking at ~T+0.5 sec, and ending at ~T+10 sec. T90 (15-350 keV) is 4.30 +- 0.26 sec (estimated error including systematics).
  The time-averaged spectrum from T-0.28 to T+4.37 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.15 +- 0.20. The fluence in the 15-150 keV band is 3.4 +- 0.4 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-0.28 sec in the 15-150 keV band is 1.0 +- 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/547420/BA/
• GCN Circular #14165
  M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
  Using 2472 s of XRT Photon Counting mode data and 5 UVOT images for GRB 130131B, 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 = 173.95566, +15.03818 which is equivalent to:

  RA (J2000): 11h 35m 49.36s
  Dec (J2000): +15d 02' 17.5"
  

  with an uncertainty of 1.8 arcsec (radius, 90% confidence).
  This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
  This circular was automatically generated, and is an official product of the Swift-XRT team.
• GCN Circular #14167
  D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), S. Nagayama (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 130131B (Siegel et al., GCNC 14159) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory.
  The observation started on 2013-01-31 19:11:04 UT (~57 sec after the burst). We did not find any new point source within the enhanced XRT circle (Goad et al., GCNC 14165) 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
  ------------------------------------------------------
  0.03838    20:05:23    4800.0   >19.8  >19.9  >19.2
  ------------------------------------------------------
  T0+ : Elapsed time after the burst [day]
  T-EXP: Total Exposure time [sec]
  

• GCN Circular #14169
  M. H. Siegel (PSU) reports on behalf of the Swift/UVOT team:
  The Swift/UVOT began settled observations of the field of GRB 130131B 114 s after the BAT trigger (Siegel et al., GCN Circ. 14159). No optical afterglow consistent with the XRT position 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           114          264          147         >20.9
  u_FC               327          577          246         >20.2
  white              114         6416          449         >22.0
  v                 3871         5506          393         >19.8
  b                  583         6325          413         >20.5
  u                  327         6120          639         >21.0
  w1                4281         5915          393         >20.4
  m2                4076         5710          393         >20.6
  w2                5101         5301          197         >21.1
  

  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 #14170
  J. Gorosabel (IAA/CSIC-UPV/EHU), L. Monteagudo Narvion (IAC), D. Malesani (DARK/NBI), S. Schulze (PUC, MCSS), report on behalf of a larger collaboration:
  "We observed the GRB 130131B (Siegel et al., GCNC 14159) at the Swift/XRT location reported in Goad et al. (GCNC 14165) with the 82cm IAC80 telescope at the Observatorio del Teide (Tenerife, Spain). I-band images with a total exposure time of 13x250s were taken on Feb 1.0135-1.0832 UT (5.2-6.8 hours post burst). No object brighter than I~21.2 mag (Vega, calibrated against USNO B1.0 and not corrected for Galactic Extinction) was detected inside the XRT error circle (Goad et al., GCNC 14165)."
• GCN Circular #14173
  F. Knust, K. Varela, J. Greiner (all MPE Garching) report on behalf of the GROND team:
  We observed the field of GRB 130131B (Swift trigger 547420; Siegel et al., GCN 14159) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG/ESO telescope at La Silla Observatory (Chile).
  Observations started at 04:00 UT on February 1st, 9 hrs after the GRB trigger, only 27 deg away from the moon. They were performed at an average seeing of 2.9 and at an average airmass of 1.6.
  We do not detect a source within the Swift-XRT error circle reported by Goad et al. (GCN 14165) down to 3-sigma AB limiting magnitudes
  g' > 23.4,
  r' > 23.7,
  i' > 23.4,
  z' > 23.3,
  J > 21.2,
  H > 20.5 and
  K > 19.7
  The given limits are derived based on calibrating the images against GROND zeropoints in g'r'i'z' and 2MASS field stars in JHK and are not corrected for the Galactic foreground extinction corresponding to a reddening of E_(B-V) = 0.03 mag in the direction of the burst (Schlegel et al. 1998).
• GCN Circular #14174
  S. Schulze (PUC, MCSS), Z. Cano (U. Iceland), J. Hjorth, D. Malesani, J. P. U. Fynbo, D. Xu (DARK/NBI) and N. R. Tanvir (U. Leicester) report on behalf of a larger collaboration:
  We observed GRB 130131B (Siegel et al., GCN Circ. 14159) with ESO/VLT X-shooter. Our observation began at 5:49 UT on 1 February, i.e. 10.7 hours post burst. We imaged the field with the acquisition camera in the r' and z' bands for 3x100 and 4x100 seconds, respectively.
  We found no optical counterpart within the revised Swift/XRT X-ray error circle reported in Goad et al. (GCN Circ. 14165) down to a limiting magnitudes of approximately 23.2 and 22.7 mag in r' and z' band, respectively. These measurements are given in the AB system and not corrected for foreground extinction.
  We thank the ESO staff at Paranal, and in particular Maja Vuckovic and Stephane Brillant for quickly performing the observations.
• GCN Circular #14176
  M.C. Stroh (PSU), D.N. Burrows (PSU), P.A. Evans (U. Leicester), O.M. Littlejohns (U. Leicester), J.P. Osborne (U. Leicester), V. Mangano (INAF-IASFPA), A. Melandri (INAF-OAB), B. Sbarufatti (INAF-OAB/PSU), J.A. Kennea (PSU) and M.H. Siegel report on behalf of the Swift-XRT team:
  We have analysed 3.1 ks of XRT data for GRB 130131B (Siegel et al. GCN Circ. 14159), from 117 s to 6.4 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN. Circ 14165).
  The light curve can be modelled with a power-law decay with a decay index of alpha=1.15 (+0.09, -0.08).
  A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.2 (+/-0.3). The best-fitting absorption column is 4.2 (+1.3, -1.1) x 10^21 cm^-2, in excess of the Galactic value of 2.8 x 10^20 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.9 x 10^-11 (7.9 x 10^-11) erg cm^-2 count^-1.
  A summary of the PC-mode spectrum is thus:

  Total column:	     4.2 (+1.3, -1.1) x 10^21 cm^-2
  Galactic foreground: 2.8 x 10^20 cm^-2
  Excess significance: 5.6 sigma
  Photon index:	     2.2 (+/-0.3)
  

  If the light curve continues to decay with a power-law decay index of 1.15, the count rate at T+24 hours will be 1.7 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 6.7 x 10^-14 (1.4 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/00547420.
  This circular is an official product of the Swift-XRT team.
• GCN Circular #14179
  Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB) J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UCSC), Eleonora Troja (GSFC), Enrico Ramirez=E2=80=90Ruiz (UCSC), José A. de Diego (UNAM), Leonid Georgiev (UNAM), Jesús González (UNAM), Carlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report:
  We observed the field of GRB 130131B (Siegel et al., GCN 14159) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir. Between 2013 February 1.42 and 2013 February 1.54 UTC (14.86 to 17.70 hrs after the BAT trigger), we obtained 1.96 hrs exposure in the r and i bands and 0.73 hrs exposure in the Z, Y, J, and H bands.
  We detect no source within the XRT error circle (Goad et al., GCN 14165). In comparison with SDSS DR8 and 2MASS, we derive the following upper limits (3-sigma) in the AB magnitude system:

   r' > 23.8
   i' > 23.1
  Z > 22.1
  Y > 21.7
  J  > 21.8
  H > 21.4
  

  These magnitudes are not corrected for Galactic extinction in the direction of the GRB.
  We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.
• GCN Circular #14187
  A. Volnova (SAI MSU/IKI), I. Korobtsev (ISTP), E. Klunko (ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
  We observed the field of the Swift GRB 130131B (Siegel et al., GCN 14159) with AZT-33IK telescope of Sayan observatory (Mondy) on Jan. 31 between (UT) 19:51:32-20:51:58. We took several images in R-filter of 60 s exposure. Within enhanced XRT position (Goad et al., GCN 14165) we do not detect any source in a combined image. Photometry is based on nearby SDSS DR8 stars.

  UT start,    t-t0           filter      Exp.   OT      UL (3 sigma)
               (mid, days)                (s)
  
  19:51:32     0.04973        R          60x60   n/d     22.5
  

• GCN Report 416.1
  GCN_Report 416.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_416_1.pdf by M.H. Siegel at PSU titled: "Swift Observations of GRB 130131B"
• GCN Circular #14193
  M. Hayashi, T. Yoshii, R. Usui, Y.Aoki, S. Kurita, Y. Saito, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
  We observed GRB 130131B (Siegel et al., GCNC 14159) with the optical three color (g, Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan.
  The observation started on 2013-01-31 19:10:57 UT (~49 sec after the burst). And we could not find any new point source within the XRT error circle in all the three bands. The results of photometry (3 sigma upper limits) are listed below.
  The photon flux were calibrated against GSC2.3 catalog.

  T0+[sec]   MID-UT   T-EXP[sec]    g'           Rc          Ic
  -------------------------------------------------------------------------------------------
       70       19:12:07       60        >16.4   >16.4   >16.2
      178      19:13:55      240       >17.4   >17.6   >17.4
     1183     19:30:40      1320      >18.6   >19.0   >18.9
     2769     19:57:06     4200       >19.1   >19.6   >19.5
  -------------------------------------------------------------------------------------------
  T0+ : Elapsed time after the burst [sec]
  T-EXP: Total Exposure time [sec]
  

• GCN Circular #14202
  D. Calder=F3n Espinoza, B. Indahl, L. Paredes Alvarez, C. Kaleida (CTIO),= and F. J. Virgili (LJMU) report:
  "As part of the REU/PIA student program at the Cerro Tololo Inter-American Observatory (CTIO) we observed GRB 130131B (Siegel et al., GCN 14159) with the SMARTS 0.9-m telescope beginning 11.6 hrs after the Swift trigger. No optical counterpart is detected within the XRT error circle to the following conservative limits:

  Midtime of exposure     Exposure time     Filter     Magnitude
  --------------------------------------------------------------------------
        12.7 hr               7x450s            R        > 20.7
        12.8 hr               7x450s            V        > 20.3
  --------------------------------------------------------------------------
  

  Magnitudes are calibrated using nearby USNOB-1 (R-band) and NOMAD (V-band) stars."
• GCN Circular #14286
  Johan P. U. Fynbo, Dong Xu, Daniele Malesani, Thomas Kruehler (DARK/NBI), Dan A. Perley (Caltech), Valerio D'Elia (ASDC, INAF), report on behalf of the X-shooter GTO GRB collaboration:
  We observed the field of GRB 130131B (Siegel et al., GCN 14159) using the Keck-I telescope equipped with the LRIS instrument. Observations were carried out on 2013 February 10 (9.62 days after the burst), simultaneously in the g and I bands, for a total exposure time of 750 and 720 s, respectively.
  A source with g = 25.7 (AB) and I = 24.9 (Vega) is detected inside the enhanced XRT error circle (which has a radius of 1.8"; Goad et al., GCN 14165), at coordinates:

  R.A.(J2000) = 11:35:49.31
  Dec.(J2000) = +15:02:18.0
  

  We consider this object to be the likely host galaxy of GRB 130131B.
  A spectrum of this source was taken on 2013 March 9 with the ESO VLT equipped with the X-shooter spectrograph, covering the wavelength range 3000-20000 AA. The exposure time was 8x900 s. In the NIR arm, we detect three emission lines, interpreted as [O III] (4960, 5007) and [O II] (3727), all at a common redshift z = 2.539. In the UVB arm, the host continuum is detected down to ~4400 AA, which corresponds to the onset of the Lyman alpha forest at the proposed redshift.
  We acknowledge excellent support from the observing staff at Mauna Kea and Paranal, in particular Emanuela Pompei, Claudio Melo, and Thomas Rivinius.