Gamma-ray Burst 051210

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 10 Dec 05 05:46:36 UT
  NOTICE_TYPE:     Swift-BAT GRB Position
  TRIGGER_NUM:     171931,   Seg_Num: 0
  GRB_RA:          330.197d {+22h 00m 47s} (J2000),
                   330.299d {+22h 01m 12s} (current),
                   329.334d {+21h 57m 20s} (1950)
  GRB_DEC:         -57.634d {-57d 38' 01"} (J2000),
                   -57.605d {-57d 36' 18"} (current),
                   -57.874d {-57d 52' 27"} (1950)
  GRB_ERROR:       3.00 [arcmin radius, statistical only]
  GRB_INTEN:       5184 [cnts]    Image_Peak=240 [image_cnts]
  TRIGGER_DUR:     1.024 [sec] 
  TRIGGER_INDEX:   146     E_range: 25-100 keV
  BKG_INTEN:       32097 [cnts]
  BKG_TIME:        20768.00 SOD {05:46:08.00} UT
  BKG_DUR:         8 [sec]
  GRB_DATE:        13714 TJD;   344 DOY;   05/12/10
  GRB_TIME:        20781.16 SOD {05:46:21.16} UT
  GRB_PHI:         -162.89 [deg]
  GRB_THETA:        27.22 [deg]
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     15.77 [sigma]
  IMAGE_SIGNIF:    8.97 [sigma]
  MERIT_PARAMS:     +1  +0  +0  +0  +2  +4  +0  +0 -47  +1 
  SUN_POSTN:       257.25d {+17h 08m 59s}  -22.92d {-22d 55' 11"}
  SUN_DIST:         61.79 [deg]
  MOON_POSTN:       10.97d {+00h 43m 53s}   +4.77d {+04d 46' 22"}
  MOON_DIST:        70.45 [deg]
  MOON_ILLUM:      70 [%]
  GAL_COORDS:      335.31,-47.35 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      308.69,-42.00 [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 = 155.24,-18.45 [deg].  
  

• red DSS finding chart ps-file
  
  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 10 Dec 05 05:48:12 UT
  NOTICE_TYPE:     Swift-XRT Position
  TRIGGER_NUM:     171931,   Seg_Num: 0
  GRB_RA:          330.1740d {+22h 00m 41.7s} (J2000),
                   330.2760d {+22h 01m 06.2s} (current),
                   329.3113d {+21h 57m 14.7s} (1950)
  GRB_DEC:         -57.6134d {-57d 36' 48.2"} (J2000),
                   -57.5847d {-57d 35' 04.8"} (current),
                   -57.8539d {-57d 51' 13.9"} (1950)
  GRB_ERROR:       5.8 [arcsec radius, statistical plus systematic, 90% containment]
  GRB_INTEN:       9.66e-10 [erg/cm2/sec]
  GRB_SIGNIF:      6.55 [sigma]
  IMG_START_DATE:  13714 TJD;   344 DOY;   05/12/10
  IMG_START_TIME:  20860.40 SOD {05:47:40.40} UT,   79.2 [sec] since BAT Trigger Time
  TAM[0-3]:        327.60 237.20 261.25 243.16
  AMPLIFIER:       2
  WAVEFORM:        134
  SUN_POSTN:       257.25d {+17h 08m 59s}  -22.92d {-22d 55' 12"}
  SUN_DIST:         61.78 [deg]
  MOON_POSTN:       10.98d {+00h 43m 56s}   +4.78d {+04d 46' 48"}
  MOON_DIST:        70.45 [deg]
  MOON_ILLUM:      70 [%]
  GAL_COORDS:      335.34,-47.35 [deg] galactic lon,lat of the burst
  ECL_COORDS:      308.69,-41.97 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Coordinates.  
  COMMENTS:        WARNING: XRT alignment calibration is on-going, and there may be  
  COMMENTS:        residual systematic offsets of several arcseconds not accounted for yet  
  COMMENTS:        by our on-board position determination algorithm.  We have increased  
  COMMENTS:        the estimated error circle radius to take this into account.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 10 Dec 05 05:48:13 UT
  NOTICE_TYPE:     Swift-XRT Image
  TRIGGER_NUM:     171931,   Seg_Num: 0
  GRB_RA:          330.1740d {+22h 00m 41.7s} (J2000),
                   330.2760d {+22h 01m 06.2s} (current),
                   329.3113d {+21h 57m 14.7s} (1950)
  GRB_DEC:         -57.6134d {-57d 36' 48.2"} (J2000),
                   -57.5847d {-57d 35' 04.8"} (current),
                   -57.8539d {-57d 51' 13.9"} (1950)
  GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
  GRB_INTEN:       43 [cnts]
  IMG_START_DATE:  13714 TJD;   344 DOY;   05/12/10
  IMG_START_TIME:  20860.40 SOD {05:47:40.40} UT,   79.2 [sec] since BAT Trigger Time
  CENTROID_X:      282.67,  raw= 283  [pixels]
  CENTROID_Y:      284.64,  raw= 285  [pixels]
  ROLL:            271.27 [deg]
  GAIN:            1
  MODE:            3, Long Image mode
  WAVEFORM:        134
  EXPO_TIME:       2.50 [sec]
  GRB_POS_XRT_Y:   -36.24
  GRB_POS_XRT_Z:   -38.78
  IMAGE_URL:       sw00171931000msxim.img
  SUN_POSTN:       257.25d {+17h 08m 59s}  -22.92d {-22d 55' 12"}
  SUN_DIST:         61.78 [deg]
  MOON_POSTN:       10.98d {+00h 43m 56s}   +4.78d {+04d 46' 48"}
  MOON_DIST:        70.45 [deg]
  MOON_ILLUM:      70 [%]
  GAL_COORDS:      335.34,-47.35 [deg] galactic lon,lat of the burst
  ECL_COORDS:      308.69,-41.97 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Image.  
  COMMENTS:        WARNING: XRT alignment calibration is on-going, and there may be  
  COMMENTS:        residual systematic offsets of several arcseconds not accounted for yet  
  COMMENTS:        by our on-board position determination algorithm.  We have increased  
  COMMENTS:        the estimated error circle radius to take this into account.  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 10 Dec 05 05:48:43 UT
  NOTICE_TYPE:     Swift-XRT Processed Image
  TRIGGER_NUM:     171931,   Seg_Num: 0
  GRB_RA:          330.1740d {+22h 00m 41.7s} (J2000),
                   330.2760d {+22h 01m 06.2s} (current),
                   329.3113d {+21h 57m 14.7s} (1950)
  GRB_DEC:         -57.6134d {-57d 36' 48.2"} (J2000),
                   -57.5847d {-57d 35' 04.8"} (current),
                   -57.8539d {-57d 51' 13.9"} (1950)
  GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
  GRB_INTEN:       43 [cnts]
  IMG_START_DATE:  13714 TJD;   344 DOY;   05/12/10
  IMG_START_TIME:  20860.40 SOD {05:47:40.40} UT,   79.2 [sec] since BAT Trigger Time
  CENTROID_X:      282.67,  raw= 283  [pixels]
  CENTROID_Y:      284.64,  raw= 285  [pixels]
  ROLL:            271.27 [deg]
  GAIN:            1
  MODE:            3, Long Image mode
  WAVEFORM:        134
  EXPO_TIME:       2.50 [sec]
  GRB_POS_XRT_Y:   -36.24
  GRB_POS_XRT_Z:   -38.78
  IMAGE_URL:       sw00171931000msxim.img
  SUN_POSTN:       257.25d {+17h 08m 59s}  -22.92d {-22d 55' 12"}
  SUN_DIST:         61.78 [deg]
  MOON_POSTN:       10.99d {+00h 43m 57s}   +4.78d {+04d 46' 57"}
  MOON_DIST:        70.46 [deg]
  MOON_ILLUM:      70 [%]
  GAL_COORDS:      335.34,-47.35 [deg] galactic lon,lat of the burst
  ECL_COORDS:      308.69,-41.97 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Processed Image.  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 10 Dec 05 05:50:17 UT
  NOTICE_TYPE:     Swift-XRT Lightcurve
  TRIGGER_NUM:     171931,   Seg_Num: 0
  POINT_RA:        330.195d {+22h 00m 47s} (J2000)
  POINT_DEC:       -57.621d {-57d 37' 13"} (J2000)
  LC_START_DATE:   13714 TJD;   344 DOY;   05/12/10
  LC_START_TIME:   20865.71 SOD {05:47:45.71} UT,   84.5 [sec] since BAT Trigger Time
  LC_STOP_DATE:    13714 TJD;   344 DOY;   05/12/10
  LC_STOP_TIME:    21002.64 SOD {05:50:02.64} UT
  LC_LIVE_TIME:    133.27 [sec], 97.3%
  DELTA_TIME:      86263.07 [sec]
  N_BINS:          100
  TERM_COND:       0
  LC_URL:          sw00171931000msx.lc
  SUN_POSTN:       257.25d {+17h 08m 60s}  -22.92d {-22d 55' 12"}
  SUN_DIST:         61.79 [deg]
  MOON_POSTN:       11.00d {+00h 44m 00s}   +4.79d {+04d 47' 22"}
  MOON_DIST:        70.46 [deg]
  MOON_ILLUM:      70 [%]
  GAL_COORDS:      335.32,-47.35 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      308.69,-41.99 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-XRT Lightcurve.  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 10 Dec 05 05:50:00 UT
  NOTICE_TYPE:     Swift-BAT GRB Lightcurve
  TRIGGER_NUM:     171931,   Seg_Num: 0
  GRB_RA:          330.197d {+22h 00m 47s} (J2000),
                   330.299d {+22h 01m 12s} (current),
                   329.334d {+21h 57m 20s} (1950)
  GRB_DEC:         -57.634d {-57d 38' 01"} (J2000),
                   -57.605d {-57d 36' 18"} (current),
                   -57.874d {-57d 52' 27"} (1950)
  GRB_DATE:        13714 TJD;   344 DOY;   05/12/10
  GRB_TIME:        20781.16 SOD {05:46:21.16} UT
  TRIGGER_INDEX:   146
  GRB_PHI:         -162.89 [deg]
  GRB_THETA:        27.22 [deg]
  DELTA_TIME:      65510.00 [sec]
  TRIGGER_DUR:     1.024 [sec] 
  LC_URL:          sw00171931000msb.lc
  SUN_POSTN:       257.25d {+17h 08m 60s}  -22.92d {-22d 55' 12"}
  SUN_DIST:         61.79 [deg]
  MOON_POSTN:       11.00d {+00h 43m 60s}   +4.79d {+04d 47' 17"}
  MOON_DIST:        70.47 [deg]
  MOON_ILLUM:      70 [%]
  GAL_COORDS:      335.31,-47.35 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      308.69,-42.00 [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 = 155.24,-18.45 [deg].  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 10 Dec 05 05:51:35 UT
  NOTICE_TYPE:     Swift-UVOT Source List
  TRIGGER_NUM:     171931,   Seg_Num: 0
  POINT_RA:        330.195d {+22h 00m 47s} (J2000)
  POINT_DEC:       -57.622d {-57d 37' 19"} (J2000)
  POINT_ROLL:      271.266d
  IMG_START_DATE:  13714 TJD;   344 DOY;   05/12/10
  IMG_START_TIME:  20863.66 SOD {05:47:43.66} UT,   82.5 [sec] since BAT Trigger Time
  FILTER:          3, V
  BKG_MEAN:        1.049
  N_STARS:         37
  X_OFFSET:        625 [pixels]
  Y_OFFSET:        640 [pixels]
  X_MAX:           1584 [pixels]
  Y_MAX:           1599 [pixels]
  DET_THRESH:      9
  PHOTO_THRESH:    4
  SL_URL:          sw00171931000msufc0082.fits
  SUN_POSTN:       257.25d {+17h 08m 60s}  -22.92d {-22d 55' 12"}
  SUN_DIST:         61.79 [deg]
  MOON_POSTN:       11.01d {+00h 44m 03s}   +4.80d {+04d 47' 43"}
  MOON_DIST:        70.48 [deg]
  MOON_ILLUM:      70 [%]
  GAL_COORDS:      335.32,-47.35 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      308.69,-41.99 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Source List.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 10 Dec 05 05:52:01 UT
  NOTICE_TYPE:     Swift-UVOT Processed Source List
  TRIGGER_NUM:     171931,   Seg_Num: 0
  POINT_RA:        330.195d {+22h 00m 47s} (J2000)
  POINT_DEC:       -57.622d {-57d 37' 19"} (J2000)
  POINT_ROLL:      271.266d
  IMG_START_DATE:  13714 TJD;   344 DOY;   05/12/10
  IMG_START_TIME:  20863.66 SOD {05:47:43.66} UT,   82.5 [sec] since BAT Trigger Time
  FILTER:          3, V
  BKG_MEAN:        1.049
  N_STARS:         37
  X_OFFSET:        625 [pixels]
  Y_OFFSET:        640 [pixels]
  X_MAX:           1584 [pixels]
  Y_MAX:           1599 [pixels]
  DET_THRESH:      9
  PHOTO_THRESH:    4
  SL_URL:          sw00171931000msufc0082.fits
  SUN_POSTN:       257.25d {+17h 09m 00s}  -22.92d {-22d 55' 13"}
  SUN_DIST:         61.79 [deg]
  MOON_POSTN:       11.02d {+00h 44m 04s}   +4.80d {+04d 47' 50"}
  MOON_DIST:        70.48 [deg]
  MOON_ILLUM:      70 [%]
  GAL_COORDS:      335.32,-47.35 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      308.69,-41.99 [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:     Sat 10 Dec 05 05:53:07 UT
  NOTICE_TYPE:     Swift-UVOT Processed Image
  TRIGGER_NUM:     171931,   Seg_Num: 0
  POINT_RA:        330.195d {+22h 00m 47s} (J2000)
  POINT_DEC:       -57.622d {-57d 37' 19"} (J2000)
  ROLL:            271.266d
  IMG_START_DATE:  13714 TJD;   344 DOY;   05/12/10
  IMG_START_TIME:  20863.66 SOD {05:47:43.66} UT,   82.5 [sec] since BAT Trigger Time
  FILTER:          3, V
  EXPOSURE_ID:     155886463
  X_OFFSET:        945 [pixels]
  Y_OFFSET:        960 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       1105
  Y_GRB_POS:       1120
  BINNING_INDEX:   1
  IM_URL:          sw00171931000msuni0082.fits
  SUN_POSTN:       257.25d {+17h 09m 00s}  -22.92d {-22d 55' 13"}
  SUN_DIST:         61.79 [deg]
  MOON_POSTN:       11.03d {+00h 44m 06s}   +4.80d {+04d 48' 08"}
  MOON_DIST:        70.49 [deg]
  MOON_ILLUM:      70 [%]
  GAL_COORDS:      335.32,-47.35 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      308.69,-41.99 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Processed Image.  
  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:     Sat 10 Dec 05 05:52:39 UT
  NOTICE_TYPE:     Swift-UVOT Image
  TRIGGER_NUM:     171931,   Seg_Num: 0
  POINT_RA:        330.195d {+22h 00m 47s} (J2000)
  POINT_DEC:       -57.622d {-57d 37' 19"} (J2000)
  ROLL:            271.266d
  IMG_START_DATE:  13714 TJD;   344 DOY;   05/12/10
  IMG_START_TIME:  20863.66 SOD {05:47:43.66} UT,   82.5 [sec] since BAT Trigger Time
  FILTER:          3, V
  EXPOSURE_ID:     155886463
  X_OFFSET:        945 [pixels]
  Y_OFFSET:        960 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       1105
  Y_GRB_POS:       1120
  BINNING_INDEX:   1
  IM_URL:          sw00171931000msuni0082.fits
  SUN_POSTN:       257.25d {+17h 09m 00s}  -22.92d {-22d 55' 13"}
  SUN_DIST:         61.79 [deg]
  MOON_POSTN:       11.02d {+00h 44m 05s}   +4.80d {+04d 48' 01"}
  MOON_DIST:        70.48 [deg]
  MOON_ILLUM:      70 [%]
  GAL_COORDS:      335.32,-47.35 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      308.69,-41.99 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Image.  
  COMMENTS:        The GRB Position came from the XRT Position Command.  
  COMMENTS:        The image has 2x2 binning (compression).  
  

  
• GCN Circular #4315
  V. Mangano (INAF-IASS), S. Barthelmy (GSFC), D. Burrows (PSU), J. Cummings (GSFC/NRC), N. Gehrels (GSFC), S. Hunsberger (PSU), D. Palmer (LANL), A. Parsons (GSFC) on behalf of the Swift team:
  At 05:46:21 UT, Swift-BAT triggered and located GRB 051210 (trigger=171931). The spacecraft slewed immediately. The BAT on-board calculated location is RA,Dec 330.197d,-57.634d {22h 00m 47s,-57d 38' 01"} (J2000), with an uncertainty of 3 arcmin (radius, 90% containment, stat+sys). The BAT light curve shows two ~1-sec peaks with a total duration of ~6 sec. The peak count rate was ~2200 counts/sec (15-350 keV), at ~0 sec after the trigger.
  XRT began observing the field at 05:47:40.40, 79.2 sec after the BAT trigger. Onboard centroiding found a bright fading uncatalogued X-ray source in the field of view at the following coordinates:

  RA(J2000):   22h 00m 41.7s
  Dec(J2000):  -57d 36' 48.2"
  

  We estimate the uncertainty of this position to be 6 arcsec (radius, 90% containment). This position is 84 arcsec from the BAT position above. The source initial flux is 9.7e-10 erg/cm2/sec.
  The UVOT data products were delayed and the results will be forthcoming in a second Circular.
• GCN Circular #4316
  E. Berger (Carnegie Observatories) and D. Fox (Penn State) report:
  "The position of GRB 051210 (GCN 4315) is located about 8' from the center of the galaxy cluster APMCC 736 (Dalton et al. 1997, MNRAS, 289, 263) with an estimated radius of at least 6' and z=0.114. We note that the XRT position (GCN 4315) does not contain any obvious galaxy possibly indicating a chance coincidence. However, the burst duration and temporal structure may indicate a short GRB."
• GCN Circular #4317
  Sally Hunsberger at PSU on behalf of the Swift UVOT team.
  The Swift Ultra-Violet/Optical Telescope began observing the field at 05:47:43 UT, 82.5 seconds after BAT trigger 171931 (Barthelmy et al. GCN 4315).
  The 200s V-band image shows no optical counterpart within the XRT positional error circle (Barthelmy et al. GCN 4315).
• GCN Circular #4318
  G. Sato (ISAS), L. Angelini (GSFC-JHU), L. Barbier (GSFC), S. Barthelmy (GSFC), M. Chester (PSU), J. Cummings (GSFC/NRC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (UMD), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/NRC), J. Tueller (GSFC) on behalf of the Swift-BAT team:
  Using the BAT data set from T-60 to T+120 sec from the recent telemetry downlink, we report further analysis of GRB 051210 (trigger #171931, Mangano, et al., GCN 4315). The BAT ground-calculated position is (RA,Dec) = 330.194,-57.623 (deg. J2000) {22h 0m 46.6s, -57d 37'21.0"} 2.0 arcmin radius (sys+stat, 90% containment). The partial coding was 90%.
  The burst light curve shape is a single, symmetric triangular peak. T90 (15-350 keV) is 1.4 +- 0.2 sec (estimated error including systematics).
  The power law index of the time-averaged spectrum is 1.1 +- 0.3. The fluence in the 15-150 keV band is (8.3 +- 1.4) x 10^-8 erg/cm2. The 1-sec peak photon flux measured starting from T+0.1 sec in the 15-150 keV band is (7.5 +- 1.2) x 10^-1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
• GCN Circular #4319
  Martin Jelinek (IAA Granada, Spain), Petr Kubanek (ISDC Versoix, Swizerland and ASU Ondrejov, Czech Republic), Michael Prouza (FZU Praha, Czech Republic) Martin F. Nekola and Rene Hudec (ASU Ondrejov, Czech Republic)
  report
  We have observed GRB051210 using robotic telescope FRAM located in Malargue, Argentina, with it's Wide Field camera, starting 57.5s after the event. The first 10s exposure shows no counterpart at the XRT position reported by Mangano et al. (GCN 4315) down to 2-sigma limit R=14.0.
  This message may be cited.
• GCN Circular #4320
  V. Mangano, G. Cusumano, V. La Parola (INAF-IASF), D. N. Burrows (PSU), L. Angelini (GSFC-JHU), and N. White (GSFC) report on behalf of the Swift team:
  We have analyzed the Swift XRT data from the first observation of GRB 051210 (Mangano et al. 2005, GCN 4315) consisting of three orbits (about 5.7 ks exposure). The refined coordinates of the X-ray afterglow are:

  RA(J2000)  = +22h 00m 41.3s
  Dec(J2000) = -57d 36' 48.2"
  

  with an estimated uncertainty of 4.2 arcseconds radius (90% containment). The XRT boresight correction has been applied through the new TELDEF file provided by the Swift Science Data Center (Angelini et al. 2005, GCN 4313). This position is 54.4 arcsec from the revised BAT position given in GCN 4318 (Sato et al. 2005) and 3 arcsec from the XRT position determined on board (Mangano et al. 2005, GCN 4315).
  The 0.2-10 keV light curve, that starts in Windowed Timing (WT) mode 87.3 seconds after the BAT trigger, shows a fading behaviour with a decaying slope of 2.3+/-0.1 over the first two orbits and is not detectable anymore during the third (the expected count rate at the end of the third orbit would be 7.0e-4 c/s).
  A preliminary spectral fit to WT and PC data of the first two orbits with an absorbed power law gives a photon index of 1.5+/-0.1 and an absorption column of (7.5 +/- 3) x 1e20 cm^-2. The Galactic absorption in the GRB direction is 2.2e20 cm^-2. Assuming the current steep decay we predict a flux lower than 1.e-16 erg cm^-2 s^-1 at one day from the burst.
• GCN Circular #4321
  S. Barthelmy (GSFC), J. Cummings (GSFC/NRC), N. Gehrels (GSFC), J. Norris (GSFC), D. Palmer (LANL), A. Parsons (GSFC) on behalf of the Swift-BAT team:
  The BAT team now believes this burst to be definitely short. The formal T90 value is 1.2 +/- 0.2 sec (Sato, Circ 4318). The 6-sec_duration statement in our 1st circ (Mangano, Circ 4315) was based on a non-background-subtracted raw TDRSS lightcurve. We now have the mask-tagged lightcurve with a ground energy scale calibration applied to the events, and the 2nd peak at T+6 sec is not present (it may be attributable to a background fluctuation or noisy detector(s)). We further note that the peak at T0 is resolved into 3 separate peaks which is not uncommon in the BATSE short bursts.
  The spectral lag (Norris & Bonnell, submitted to ApJ) for this burst is -0.0010 sec (+0.0150 -0.0170 sec); very typical for short bursts.
  Swift-XRT & UVOT follow-up observations are continuing and we encourage other follow-up observations on this short burst.
• GCN Circular #4322
  M. Still, A. Kniazev, S. Siyengo (SAAO)
  The Southern African Large Telescope, currently in Performance-Verification phase, observed the field of GRB 051210 during evening twilight, and through thickening cloud, with the Salticam CCD camera. Based on comparison with nearby sources, and assuming R-I = 0, we find no sources inside the Swift-XRT error circle (Mangano et al; GCN 4315) down to a limiting magnitude of I = 20.2 at 2005/12/10 18:48 UT.
• GCN Circular #4323
  E. Berger (Carnegie Observatories) and A. Boss (Carnegie DTM) reoprt:
  "We imaged the error circle of GRB 051210 (GCNs 4318, 4320) with the du Pont 100-inch telescope at Las Campanas Observatory in I-band for a total of 30 min starting on 2005 December 11.04 UT (19.2 hours after the burst). The images were obtained at an airmass of about 1.4 and an average seeing of about 0.8". We do not detect any objects within the XRT error circle to an estimated 5-sigma limit of I>23 mag."
• GCN Circular #4330
  J. S. Bloom (UC Berkeley), M. Modjaz (CfA/Harvard), P. Challis (CfA/Harvard), R. P. Kirshner (CfA/Harvard), W.-W. Chen (Chicago), J. X. Prochaska (UCO/Lick) report:
  Starting 11 Dec 2005 01:10:41 UTC, we observed the field of the short burst GRB 051210 (Mangano et al. 4315, 4320; Sato et al. 4318) with the 6.5m Clay/Magellan using the LDSS3 instrument (*). In a stack of 2x10min exposures in r'-band, we find one clearly detected source consistent the revised (GCN 4320) error circle. The J2000 coordinates of this source is:

      RA    = 22:00:40.93
      DEC = -57:36:47.1
  

  We make no claim of variability at this time, and note that the source appears somewhat extended (north by north east). In addition there appears to be a marginally detected source at (end figures) 41.41, 47.0. Follow-up is encouraged."
  A finding chart may be found at: http://astro.berkeley.edu/~jbloom/grb051210_find.pdf (red diamonds are USNO B1.0 positions)
  This message may be cited. (*) http://www.ociw.edu/lco/magellan/instruments/LDSS3/
• GCN Circular #4331
  A. J. Blustin (UCL-MSSL), V. Mangano (INAF-IASS), W. Voges (MPE), F. Marshall (GSFC), N. Gehrels (GSFC) on behalf of the Swift/UVOT team report:
  The Swift/UVOT began observing the field of GRB 051210 at 05:47:43 UT on 2005-12-10, 70 s after the BAT trigger (Mangano et al., GCN 4315). No source was observed in any of the UVOT filters at the refined XRT position (Mangano et al., GCN 4320) or at the position of the Magellan source (Bloom et al. GCN 4330). 3-sigma upper limits in summed images from each of the filters are listed below (not corrected for extinction; E(B-V) = 0.019).

  Filter   T_range(s)  Exp(s)  3sigUL(mag)
  
  V        70-76498    3721    20.6
  B        450-74933   4954    21.7
  U        395-70715   4276    21.2
  W1       341-81624   4338    21.7
  M2       287-80716   4377    22.1
  W2       558-75839   4005    22.3
  White    503-931      100    19.9
  

• astro-ph/0602541 from 24 Feb 2006
  Parola:
  The short/hard GRB051210 was detected and located by the Swift-BAT instrument and rapidly pointed towards by the narrow field instrumens. The XRT was able to observe a bright X-ray afterglow, one of the few ever observed for this class of bursts. We present the analysis of the prompt and afterglow emission of this event The BAT spectrum is a power-law with photon index 1.1 +/-0.3. The X-ray light curve decays with slope 2.58+/-0.11 and shows a small flare in the early phases. The spectrum can be described with a power law with photon index 1.54+/-0.16 and absorption (7.5 (-3.2, +4.3)*10^20 cm-2 We find that the X-ray emission is consistent with the hypothesis that we are observing the curvature effect of a GRB occurred in a low density medium, with no detectable afterglow. We estimate the density of the circumburst medium to be lower than 4*10^-3 cm^-3. We also discuss different hypothesis on the possible origin of the flare.
• astro-ph/0701818 from 29 Jan 2007
  Parola: The short GRB 051210 observed by Swift
  We report on the short GRB051210 detected by the Swift-BAT. The light curve, on which we focus mainly, shows a hint of extended emission in the BAT energy range, a steep decay of the X-ray emission, without any flattening or break, and two small flares in the first 300 sec. The emission fades out after ~1000 s.
• photometric redshift z = 2.58 +0.11 -0.17
  of host-galaxy: A. E. Nugent et al. 2022, ApJ, 940, 57