Gamma-ray Burst 061222B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 22 Dec 06 04:12:22 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     252593,   Seg_Num: 0
GRB_RA:          105.357d {+07h 01m 26s} (J2000),
                 105.428d {+07h 01m 43s} (current),
                 104.847d {+06h 59m 23s} (1950)
GRB_DEC:         -25.855d {-25d 51' 19"} (J2000),
                 -25.866d {-25d 51' 56"} (current),
                 -25.783d {-25d 46' 58"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=1510 [image_cnts]
TRIGGER_DUR:     64.000 [sec] 
TRIGGER_INDEX:   20000     E_range: 25-100 keV
BKG_INTEN:       0 [cnts]
BKG_TIME:        0.00 SOD {00:00:00.00} UT
BKG_DUR:         0 [sec]
GRB_DATE:        14091 TJD;   356 DOY;   06/12/22
GRB_TIME:        15062.35 SOD {04:11:02.35} UT
GRB_PHI:         104.08 [deg]
GRB_THETA:        37.18 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    10.83 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +2  -3  +0  +1 +62  +1 
SUN_POSTN:       270.18d {+18h 00m 42s}  -23.44d {-23d 26' 15"}
SUN_DIST:        128.53 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      292.27d {+19h 29m 04s}  -26.29d {-26d 17' 34"}
MOON_DIST:       127.43 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      237.24, -9.44 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      110.94,-48.18 [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 = 353.71,-3.95 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 22 Dec 06 04:13:53 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     252593,   Seg_Num: 0
GRB_RA:          105.3531d {+07h 01m 24.7s} (J2000),
                 105.4243d {+07h 01m 41.8s} (current),
                 104.8427d {+06h 59m 22.2s} (1950)
GRB_DEC:         -25.8597d {-25d 51' 34.9"} (J2000),
                 -25.8700d {-25d 52' 12.0"} (current),
                 -25.7872d {-25d 47' 13.8"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       58 [cnts]
IMG_START_DATE:  14091 TJD;   356 DOY;   06/12/22
IMG_START_TIME:  15207.43 SOD {04:13:27.43} UT,   145.1 [sec] since BAT Trigger Time
CENTROID_X:      333.57,  raw= 334  [pixels]
CENTROID_Y:      288.67,  raw= 289  [pixels]
ROLL:            162.08 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -21.98
GRB_POS_XRT_Z:   73.72
IMAGE_URL:       sw00252593000msxps_rw.img
SUN_POSTN:       270.18d {+18h 00m 43s}  -23.44d {-23d 26' 15"}
SUN_DIST:        128.53 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      292.28d {+19h 29m 08s}  -26.29d {-26d 17' 25"}
MOON_DIST:       127.42 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      237.24, -9.44 [deg] galactic lon,lat of the burst
ECL_COORDS:      110.94,-48.19 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 22 Dec 06 04:13:53 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     252593,   Seg_Num: 0
GRB_RA:          105.3531d {+07h 01m 24.7s} (J2000),
                 105.4243d {+07h 01m 41.8s} (current),
                 104.8427d {+06h 59m 22.2s} (1950)
GRB_DEC:         -25.8597d {-25d 51' 34.9"} (J2000),
                 -25.8700d {-25d 52' 12.0"} (current),
                 -25.7872d {-25d 47' 13.8"} (1950)
GRB_ERROR:       5.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.30e-09 [erg/cm2/sec]
GRB_SIGNIF:      7.61 [sigma]
IMG_START_DATE:  14091 TJD;   356 DOY;   06/12/22
IMG_START_TIME:  15207.43 SOD {04:13:27.43} UT,   145.1 [sec] since BAT Trigger Time
TAM[0-3]:        327.59 237.23 261.15 243.38
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       270.18d {+18h 00m 43s}  -23.44d {-23d 26' 15"}
SUN_DIST:        128.53 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      292.28d {+19h 29m 08s}  -26.29d {-26d 17' 25"}
MOON_DIST:       127.42 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      237.24, -9.44 [deg] galactic lon,lat of the burst
ECL_COORDS:      110.94,-48.19 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 22 Dec 06 04:13:56 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     252593,   Seg_Num: 0
GRB_RA:          105.3531d {+07h 01m 24.7s} (J2000),
                 105.4243d {+07h 01m 41.8s} (current),
                 104.8427d {+06h 59m 22.2s} (1950)
GRB_DEC:         -25.8597d {-25d 51' 34.9"} (J2000),
                 -25.8700d {-25d 52' 12.0"} (current),
                 -25.7872d {-25d 47' 13.8"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       58 [cnts]
IMG_START_DATE:  14091 TJD;   356 DOY;   06/12/22
IMG_START_TIME:  15207.43 SOD {04:13:27.43} UT,   145.1 [sec] since BAT Trigger Time
CENTROID_X:      333.57,  raw= 334  [pixels]
CENTROID_Y:      288.67,  raw= 289  [pixels]
ROLL:            162.08 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -21.98
GRB_POS_XRT_Z:   73.72
IMAGE_URL:       sw00252593000msxps_rw.img
SUN_POSTN:       270.18d {+18h 00m 43s}  -23.44d {-23d 26' 15"}
SUN_DIST:        128.53 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      292.28d {+19h 29m 08s}  -26.29d {-26d 17' 24"}
MOON_DIST:       127.42 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      237.24, -9.44 [deg] galactic lon,lat of the burst
ECL_COORDS:      110.94,-48.19 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 22 Dec 06 04:14:59 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     252593,   Seg_Num: 0
GRB_RA:          105.357d {+07h 01m 26s} (J2000),
                 105.428d {+07h 01m 43s} (current),
                 104.847d {+06h 59m 23s} (1950)
GRB_DEC:         -25.855d {-25d 51' 19"} (J2000),
                 -25.866d {-25d 51' 56"} (current),
                 -25.783d {-25d 46' 58"} (1950)
GRB_DATE:        14091 TJD;   356 DOY;   06/12/22
GRB_TIME:        15062.35 SOD {04:11:02.35} UT
TRIGGER_INDEX:   20000
GRB_PHI:         104.08 [deg]
GRB_THETA:        37.18 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    10.83 [sigma]
LC_URL:          sw00252593000msb.lc
SUN_POSTN:       270.18d {+18h 00m 43s}  -23.44d {-23d 26' 15"}
SUN_DIST:        128.53 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      292.29d {+19h 29m 11s}  -26.29d {-26d 17' 17"}
MOON_DIST:       127.43 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      237.24, -9.44 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      110.94,-48.18 [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 = 353.71,-3.95 [deg].

GCN Circular #5956
E. Berger (Carnegie) reports:
"We imaged the location of GRB 061222b with LDSS3 on Magellan. Within the XRT error circle we find a bright optical afterglow at:
```
 	RA = 07:01:24.6
 	DEC = -25:51:36
```
with an uncertainty of about 1". Spectroscopic observations are in progress."

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 22 Dec 06 04:35:09 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     252593,   Seg_Num: 0
POINT_RA:        105.367d {+07h 01m 28s} (J2000)
POINT_DEC:       -25.877d {-25d 52' 37"} (J2000)
POINT_ROLL:      162.083d
IMG_START_DATE:  14091 TJD;   356 DOY;   06/12/22
IMG_START_TIME:  15208.86 SOD {04:13:28.86} UT,   146.5 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.784
N_STARS:         190
X_OFFSET:        353 [pixels]
Y_OFFSET:        663 [pixels]
X_MAX:           1312 [pixels]
Y_MAX:           1622 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00252593000msufc0146.fits
SUN_POSTN:       270.19d {+18h 00m 47s}  -23.44d {-23d 26' 15"}
SUN_DIST:        128.52 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      292.50d {+19h 30m 01s}  -26.25d {-26d 15' 05"}
MOON_DIST:       127.42 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      237.26, -9.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      110.96,-48.20 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 22 Dec 06 04:35:36 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     252593,   Seg_Num: 0
POINT_RA:        105.367d {+07h 01m 28s} (J2000)
POINT_DEC:       -25.877d {-25d 52' 37"} (J2000)
POINT_ROLL:      162.083d
IMG_START_DATE:  14091 TJD;   356 DOY;   06/12/22
IMG_START_TIME:  15208.86 SOD {04:13:28.86} UT,   146.5 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.784
N_STARS:         190
X_OFFSET:        353 [pixels]
Y_OFFSET:        663 [pixels]
X_MAX:           1312 [pixels]
Y_MAX:           1622 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00252593000msufc0146.fits
SUN_POSTN:       270.19d {+18h 00m 47s}  -23.44d {-23d 26' 15"}
SUN_DIST:        128.52 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      292.51d {+19h 30m 02s}  -26.25d {-26d 15' 02"}
MOON_DIST:       127.42 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      237.26, -9.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      110.96,-48.20 [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 22 Dec 06 04:36:33 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     252593,   Seg_Num: 0
POINT_RA:        105.367d {+07h 01m 28s} (J2000)
POINT_DEC:       -25.877d {-25d 52' 37"} (J2000)
ROLL:            162.083d
IMG_START_DATE:  14091 TJD;   356 DOY;   06/12/22
IMG_START_TIME:  15208.86 SOD {04:13:28.86} UT,   146.5 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     188453610
X_OFFSET:        673 [pixels]
Y_OFFSET:        983 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       833
Y_GRB_POS:       1143
BINNING_INDEX:   1
IM_URL:          sw00252593000msuni0146.fits
SUN_POSTN:       270.20d {+18h 00m 47s}  -23.44d {-23d 26' 15"}
SUN_DIST:        128.52 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      292.52d {+19h 30m 04s}  -26.25d {-26d 14' 55"}
MOON_DIST:       127.42 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      237.26, -9.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      110.96,-48.20 [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 22 Dec 06 04:36:50 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     252593,   Seg_Num: 0
POINT_RA:        105.366d {+07h 01m 28s} (J2000)
POINT_DEC:       -25.879d {-25d 52' 44"} (J2000)
POINT_ROLL:      162.083d
IMG_START_DATE:  14091 TJD;   356 DOY;   06/12/22
IMG_START_TIME:  15935.13 SOD {04:25:35.13} UT,   872.8 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        0.170
N_STARS:         75
X_OFFSET:        353 [pixels]
Y_OFFSET:        663 [pixels]
X_MAX:           1312 [pixels]
Y_MAX:           1622 [pixels]
DET_THRESH:      5
PHOTO_THRESH:    2
SL_URL:          sw00252593000msufc0872.fits
SUN_POSTN:       270.20d {+18h 00m 47s}  -23.44d {-23d 26' 15"}
SUN_DIST:        128.51 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      292.52d {+19h 30m 05s}  -26.25d {-26d 14' 53"}
MOON_DIST:       127.42 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      237.26, -9.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      110.96,-48.21 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 22 Dec 06 04:36:56 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     252593,   Seg_Num: 0
POINT_RA:        105.367d {+07h 01m 28s} (J2000)
POINT_DEC:       -25.877d {-25d 52' 37"} (J2000)
ROLL:            162.083d
IMG_START_DATE:  14091 TJD;   356 DOY;   06/12/22
IMG_START_TIME:  15208.86 SOD {04:13:28.86} UT,   146.5 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     188453610
X_OFFSET:        673 [pixels]
Y_OFFSET:        983 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       833
Y_GRB_POS:       1143
BINNING_INDEX:   1
IM_URL:          sw00252593000msuni0146.fits
SUN_POSTN:       270.20d {+18h 00m 47s}  -23.44d {-23d 26' 15"}
SUN_DIST:        128.52 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      292.52d {+19h 30m 05s}  -26.25d {-26d 14' 53"}
MOON_DIST:       127.42 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      237.26, -9.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      110.96,-48.20 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 22 Dec 06 04:37:17 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     252593,   Seg_Num: 0
POINT_RA:        105.366d {+07h 01m 28s} (J2000)
POINT_DEC:       -25.879d {-25d 52' 44"} (J2000)
POINT_ROLL:      162.083d
IMG_START_DATE:  14091 TJD;   356 DOY;   06/12/22
IMG_START_TIME:  15935.13 SOD {04:25:35.13} UT,   872.8 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        0.170
N_STARS:         75
X_OFFSET:        353 [pixels]
Y_OFFSET:        663 [pixels]
X_MAX:           1312 [pixels]
Y_MAX:           1622 [pixels]
DET_THRESH:      5
PHOTO_THRESH:    2
SL_URL:          sw00252593000msufc0872.fits
SUN_POSTN:       270.20d {+18h 00m 47s}  -23.44d {-23d 26' 15"}
SUN_DIST:        128.51 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      292.52d {+19h 30m 06s}  -26.25d {-26d 14' 50"}
MOON_DIST:       127.42 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      237.26, -9.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      110.96,-48.21 [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 22 Dec 06 04:37:55 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     252593,   Seg_Num: 0
POINT_RA:        105.366d {+07h 01m 28s} (J2000)
POINT_DEC:       -25.879d {-25d 52' 44"} (J2000)
ROLL:            162.083d
IMG_START_DATE:  14091 TJD;   356 DOY;   06/12/22
IMG_START_TIME:  15935.13 SOD {04:25:35.13} UT,   872.8 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     188454336
X_OFFSET:        672 [pixels]
Y_OFFSET:        982 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       832
Y_GRB_POS:       1142
BINNING_INDEX:   1
IM_URL:          sw00252593000msuni0872.fits
SUN_POSTN:       270.20d {+18h 00m 47s}  -23.44d {-23d 26' 15"}
SUN_DIST:        128.51 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      292.53d {+19h 30m 07s}  -26.25d {-26d 14' 46"}
MOON_DIST:       127.42 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      237.26, -9.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      110.96,-48.21 [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 Circular #5957
J. L. Racusin (PSU), L. M. Barbier (NASA/GSFC), S. D. Barthelmy (GSFC), P. J. Brown (PSU), M. M. Chester (PSU), J. R. Cummings (NASA/UMBC), N. Gehrels (NASA/GSFC), D. Grupe (PSU), J. A. Kennea (PSU), F. E. Marshall (NASA/GSFC), K. M. McLean (LANL/UTD), D. M. Palmer (LANL) and M. Stamatikos (NASA/ORAU) report on behalf of the Swift Team:
At 04:11:02 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 061222B (trigger=252593). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 105.357, -25.855 which is
```
   RA(J2000) = 07h 01m 26s
   Dec(J2000) = -25d 51' 19"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single rounded peak with a duration of about 50 sec. The peak count rate was ~800 counts/sec (15-350 keV), at ~48 sec after the trigger.
The XRT began observing the field at 04:13:27 UT, 145 seconds after the BAT trigger. XRT found a bright, fading, uncatalogued X-ray source located at RA, Dec 105.35372, -25.8592 which is
```
   RA(J2000) = 07h 01m 24.89s 
   Dec(J2000) = -25d 51' 33.1" 
```
with an estimated uncertainty of 4.1 arcseconds (90% confidence radius). This location is 18.5 arcseconds from the BAT on-board position, within the BAT error circle. The initial flux in the 2.5s image was 1.3e-09 erg/cm2/s (0.2-10 keV).
UVOT took a finding chart exposure of 400 seconds with the V filter starting 146 seconds after the BAT trigger. No afterglow candidate has been found in the initial data products. We note that there is no detected source flux in the UVOT V image at the position of the afterglow candidate reported in GCN 5956. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The 3-sigma upper limit is 19.0 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The limiting magnitude is expected to be about 17.8. No correction has been made for the expected extinction of about 1.3 magnitudes.
GCN Circular #5958
E. Berger (Carnegie) reports:
"Spectroscopic observations of the afterglow (GCN 5956) of GRB 061222b (GCN 5957) with LDSS3 on Magellan reveal a strong continuum break at about 5340A corresponding to Ly-alpha at z~3.4."
GCN Circular #5959
Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report:
We imaged the field of GRB 061222B detected by SWIFT (trigger 252593) with the TAROT robotic telescope (D=25cm) located at the European Southern Observatory, La Silla observatory, Chile.
The observations started 149.8s after the GRB trigger (70.0s after the notice). The elevation of the field increased from from 70 degrees above horizon and weather conditions were excellents.
The date of trigger : t0 = 2006-12-22T04:11:02.112
The first image is 30.0s exposure in tracking mode. We do not detect any OT in the XRT error box (Racusin et al. 2006 CNC circ. 5957) with a limiting magnitude of: t0+149.8s to t0+179.8s : R > 17.9
It must be noticed that the XRT position is near the star USNO-B1.0 0641-0103283 (R=9.3) that can masks a faint afterglow on TAROT images.
The second image is 30.0s exposure in tracking mode: t0+185.4s to t0+215.4s : R > 17.9
We co-added a series of exposures: t0+149.8s to t0+534.5s : R > 19.9
Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.
N.B. Galactic coordinates are lon=237.2359 lat= -9.4366 and the galactic extinction in R band is 0.6 magnitudes estimated from D. Schlegel et al. 1998ApJ...500..525S.
This message may be cited.
GCN Circular #5960
Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report:
We analyzed carefully the afterglow position provided by Berger GNC Circ. 5956 on TAROT la Silla images. A very faint source is detected only on the first 30s image obtained from 150 to 180 seconds after the trigger.
We estimate a magnitude R=18.2 +/- 0.5 (S/N=2).
N.B. As we mentioned in the GCN Circ. 5959, the GRB position is near the star USNO-B1.0 0641-0103283 (R=9.3). The afterglow lies at the end of a "arm spider" of the star.
GCN Circular #5961
B. E. Cobb (Yale), part of the larger SMARTS consortium, reports:
Using the ANDICAM instrument on the 1.3m telescope at CTIO, we obtained optical/IR imaging of the error region of GRB 061222b (GCN 5957, Racusin et al.), with a mid-exposure time of 2006-12-22 04:42:11 UT, which is ~0.5 hours post-burst. Several dithered images were obtained in each filter, with total summed exposure times of 180s in each of BRIYJK and 120s in each of H and V.
In the I-band a dim object is detected with a preliminary magnitude of I=20.7+/-0.4 at the position of the afterglow reported by Berger (GCN 5956). This source is not significantly detected in the J-band to a limiting magnitude of J<18. Photometry is calibrated with USNO-B1.0 stars in the optical and 2MASS stars in the IR. Photometry is effect by high background due to the nearby bright star.
GCN Circular #5962
E. Berger (Carnegie) reports:
"Using several metal absorption features (e.g., SiII, CII, SiIV, etc.) in our first 1800 sec spectroscopic observation we determine a refined redshift for GRB 061222b of z=3.355."
GCN Circular #5963
S. Covino, E. Di Stefano, E. Molinari, G. Chincarini, F.M. Zerbi, V. Testa, G. Tosti, F. Vitali, P. Conconi, L.A. Antonelli, G. Cutispoto, G. Malaspina, L. Nicastro, E. Palazzi, E. Meurs, and P. Goldoni report on behalf of the REM/ROSS team:
We imaged the field of GRB 061222B (Racusin et al. GCN 5957) with the robotic 60-cm REM telescope located at La Silla (Chile). A first set of observations was performed automatically in the optical and near infrared (V,R,I and z', J, H, K bands).
A preliminary analysis allows to marginally detect the afterglow identified by Berger (GCN 5956) at H ~ 16.0 at 4:14:48 UT.
This message may be cited.
GCN Circular #5967
A. C. Updike and D. H. Hartmann (Clemson University) report on behalf of the Clemson GRB Follow-Up Team:
We imaged the field of GRB 061222B 45 minutes after Swift Trigger 252593 with the SARA 0.9m at Kitt Peak under good weather conditions. We obtained 20 180-second exposures in the R band. We find no fading OT candidate at the position noted by E. Berger (GCN 5956) in the stacked images down to a limiting magnitude of R = 19.0 +/- 0.2 mag (based on calibration to USNO A2.0).
The Clemson Unversity GRB Response Site may be found at: http://people.clemson.edu/~kgarime/burst/index.php
The SARA Homepage can be found at: http://saraobservatory.org
This message may be cited.
GCN Circular #5968
A. de Ugarte Postigo, M. Jel=EDnek, A. J. Castro-Tirado, V. Casanova, J. Gorosabel, R. Cunniffe, S. Vitek (IAA-CSIC Granada), P. Kub=E1nek (Univ. de Valencia), R. Hudec (ASU-CAS Ondrejov) and L. Sabau-Graziati (INTA Madrid),
report:
"Following the detection of GRB 061222B by SWIFT (GCN 5957), the field was imaged with the 60-cm BOOTES-IR robotic telescope located at Observatorio de Sierra Nevada (Granada, Spain). Observations were taken in the R-band starting at 04:12:44 U.T. (i.e. 102 s after the onset of the event). On a co-add of several images (30s total time) taken at 04:18:46 (464 s after the GRB trigger), the optical afterglow (GCNC 5956) is detected with R = 17.7 +/- 0.5. The high airmass (~4.3) prevented taking high quality data. Further analysis is ongoing."
This message may be cited.
GCN Circular #5970
J. L. Racusin, J. Kennea (PSU), J. P. Osborne, and K. L. Page (U Leicester) report on behalf of the Swift XRT team:
We have analyzed the first two orbits of Swift-XRT data on GRB 061222B (Racusin et al. GCN 5957), with a total exposure of 119 seconds in Window Timing (WT) mode and 906 seconds in Photon Counting (PC) mode. This provides a refined XRT position at RA, Dec = 105.35321, -25.8594 which is:
```
RA(J2000) = 7h 01m 24.77s
Dec(J2000) = -25d 51' 33.9"
```
with an estimated error radius of 3.7 arcseconds (90% confidence). This position is 20 arcseconds from the initial BAT position (Racusin et al. GCN 5957), 1.8 arcseconds from the initial XRT position (Racusin et al. GCN 5957), and 3.1 arcseconds from the optical candidate discovered by Berger et al. (GCN 5956).
The 0.3-10 keV X-ray light curve between 145s and 4900s after the trigger can be fit with a broken power-law with an initial decay slope of 3.26 +/- 0.10, a break at 450s, and a post-break slope of 1.24 +/- 0.15.
The X-ray spectrum from the WT data covering the time period from T+145s to T+264s is well fit by an absorbed power-law with a photon index of 2.6 +/- 0.2 and column density of (4.0 +/-0.6 )e21 cm**-2. We note the Galactic column density in the direction of the source is 2.7e20 cm**-2. The unabsorbed 0.3-10 keV flux for this spectrum is 8.7e-10 erg/cm**2/s.
Assuming the X-ray emission continues to decline at the same rate, we predict a 0.3-10 keV XRT count rate of 1e-3 count/s at T+24hr, which corresponds to an observed 0.3-10 keV flux of 3.6e-14 erg/cm**2/s.
After the initial first orbit and partial second orbit of automated observations, the automated target was changed back to GRB061222A due to XRT thermal constraints. Observations of GRB061222B will continue at a later time.
This circular is an official product of the Swift XRT Team.
GCN Circular #5971
M. Uemura, A. Arai, and T. Uehara (Hiroshima Univ.), report on behalf of the KANATA GRB team:
We perfomed optical imaging of the field of GRB061222B (GCN 5957) at 15:10-15:17 UT 22 Dec. using the TRISPEC attached to the KANATA 1.5-m telescope at Higashi-Hiroshima Observatory, Japan. We obtained 4 R-band images with a 123-s exposure time. The images were calibrated with neighbor stars in the USNO A2.0 catalog (r mag.).
We cannot significantly detect the afterglow at the position reported in GCN 5956 in our images. The limit magnitude is estimated to be 20.2 (3-sigma).
```
UT            Time after the burst (s)    Limit mag in R   Exp. Time
Dec. 22.63480        39784                    20.2          123 * 4
```
GCN Circular #5972
S. B. Pandey (UCL-MSSL), J. L. Racusin (PSU), S. R. Oates (UCL-MSSL) report on the behalf of the Swift UVOT team:
The Swift/UVOT observed the field of GRB061222B starting 136 sec after the BAT trigger (GCN Circ. 5957). We do not detect the afterglow candidate reported in GCN Circ.5956 in our V band exposures. This is in accordance with the observed redshift of z=3.355 (GCN Circ. 5962) for the burst.
The determined 3-sigma upper limits for V band settling, finding-chart exposures and for the co-added frames of the observed UVOT filters are:
```
Filter         T_start   T_stop    Exp(s)    Mag (3-sigma upper limit)
-----------------------------------------------------------------
V settling     136       145       9         17.29
V finding      146       546       393       19.77

V              136       890       475       19.86
B              624       4884      141       20.29
U              600       4755      235       19.98
UVW1           576       4551      255       19.76
UVM2           552       4346      255       19.96
UVW2           640       794       38        18.64
-----------------------------------------------------------------
```
The values quoted above are not corrected for the expected Galactic extinction of E_{B-V} = 0.38 mag towards the burst direction (Schlegel et al. 1998).
GCN Circular #5974
L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), J. L. Racusin (PSU), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC) on behalf of the Swift-BAT team:
Using the data set from T-239.0 to T+903.1 sec from the recent telemetry downlink, we report further analysis of BAT GRB 061222 (trigger #252593) (Racusin, et al., GCN Circ. 5957). The BAT ground-calculated position is RA, Dec = 105.352, -25.865 deg which is
```
   RA(J2000) = 7h 1m 24.6s 
   Dec(J2000) = -25d 51' 55.6" 
```
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 16%.
The burst had a single gradual peak with several sub peaks. T90 (15-350 keV) is 40 +- 5 sec (estimated error including systematics). At this time, there is a gap in the downlinked data from T+480 sec to T+660 and T+720 to T+840 sec. A further Circular will be issued if burst activity is found in these intervals.
The time-averaged spectrum from T+35.1 to T+84.3 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.98 +- 0.13. The fluence in the 15-150 keV band is 2.2 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+59.16 sec in the 15-150 keV band is 1.5 +- 0.4 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
GCN Circular #5977
T. Ishimura, Y. Yatsu, T. Shimokawabe, N. Vasquez, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the error box of GRB061222B (Racusin et al., GCN 5957) with the 3-color 50cm MITSuME Telescope at Akeno, Japan starting at 12:52:28 UT, 8.7 hours after the trigger. In the co-added images of Ic, Rc, and g' bands, we did not detect the afterglow (Berger, GCN 5956). The 3-sigma limiting magnitudes based on USNO-B1.0 (I-band) and NOMAD (R-band,g'-band) stars are following.
```
Filter   start time   end time    Exp(s)    Mag (3-sigma upper limit)
-----------------------------------------------------------------
Ic       12:52:28    13:29:50     60s * 29       18.3
Rc       12:52:28    13:29:50     60s * 29	 19.7
g'       12:52:28    13:29:50     60s * 29	 19.4
-----------------------------------------------------------------
```
GCN Report 23.1
GCN_Report 23.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_23_1.pdf by J.L. Racusin at PSU titled: "Swift observations of GRB 061222B"
GCN Circular #5981
Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report:
We solve technichal problems that prevent to acces to the first trailed image of GRB 061222B obtained with TAROT located at the European Southern Observatory, La Silla observatory, Chile.
The observations started 84.1s after the GRB trigger (4s after the notice). The trailed image allows to follow continuously variable source during the 60s integration time (see technichal description in Klotz et al., 2006, A&A 451, L39). The GRB expected trail is blended with the trail of the USNO-B1 star 0641-0103259 of R=14.7 after 24s. During the 24 first seconds we do not detect the optical transient brighter than R~17.7. Moreover, we confirm the optical detection in the first non trailed image (Klotz et al. GCN Circ. 5960) taken in the range t0+150 to t0+180s. To summarize:
```
t0+ 84s to t0+108s : R > 17.7
t0+108s to t0+144s : R > 14.7
t0+150s to t0+180s : R = 18.2 +/- 0.5 (GCNC 5960)
t0+185s to t0+215s : R > 18.2
t0+150s to t0+534s : R = 19.9 (GCNC 5959)
```
Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.
This message may be cited.
GCN Circular #5998
Poonam Chandra (NRAO/UVA) and Dale A. Frail (NRAO) report on behalf of the Caltech-NRAO-Carnegie GRB Collaboration:
"We used the Very Large Array to observe the field of view toward GRB 061222B (GCN 5957) at a frequency of 8.46 GHz on 2006 December 23 at 8.11 UT. The peak radio brightness at the XRT position (GCN 5970) is -34 uJy +- 54 uJy.
The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc."

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Jochen Greiner, last update: 06-Jan-2007 [Disclaimer]