Gamma-ray Burst 051109

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 09 Nov 05 01:12:48 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     163136,   Seg_Num: 0
GRB_RA:          330.296d {+22h 01m 11s} (J2000),
                 330.357d {+22h 01m 26s} (current),
                 329.775d {+21h 59m 06s} (1950)
GRB_DEC:         +40.837d {+40d 50' 15"} (J2000),
                 +40.866d {+40d 51' 57"} (current),
                 +40.596d {+40d 35' 46"} (1950)
GRB_ERROR:       4.00 [arcmin radius, statistical only]
GRB_INTEN:       9453 [cnts]    Image_Peak=264 [image_cnts]
TRIGGER_DUR:     2.048 [sec] 
TRIGGER_INDEX:   265     E_range: 50-350 keV
BKG_INTEN:       87329 [cnts]
BKG_TIME:        4304.00 SOD {01:11:44.00} UT
BKG_DUR:         24 [sec]
GRB_DATE:        13683 TJD;   313 DOY;   05/11/09
GRB_TIME:        4340.52 SOD {01:12:20.52} UT
GRB_PHI:           7.35 [deg]
GRB_THETA:        53.59 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     20.07 [sigma]
IMAGE_SIGNIF:    11.47 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +3  +7  +0  +0 +39  +1 
SUN_POSTN:       224.27d {+14h 57m 04s}  -16.84d {-16d 50' 11"}
SUN_DIST:        112.96 [deg]
MOON_POSTN:      320.23d {+21h 20m 56s}  -20.09d {-20d 05' 18"}
MOON_DIST:        61.68 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:       91.46,-11.41 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      352.73, 48.51 [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.

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 09 Nov 05 01:14:55 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     163136,   Seg_Num: 0
GRB_RA:          330.3149d {+22h 01m 15.5s} (J2000),
                 330.3760d {+22h 01m 30.2s} (current),
                 329.7939d {+21h 59m 10.5s} (1950)
GRB_DEC:         +40.8227d {+40d 49' 21.7"} (J2000),
                 +40.8510d {+40d 51' 03.7"} (current),
                 +40.5815d {+40d 34' 53.2"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       48 [cnts]
IMG_START_DATE:  13683 TJD;   313 DOY;   05/11/09
IMG_START_TIME:  4460.18 SOD {01:14:20.18} UT,   119.7 [sec] since BAT Trigger Time
CENTROID_X:      270.71,  raw= 271  [pixels]
CENTROID_Y:      338.01,  raw= 338  [pixels]
ROLL:            267.13 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   89.41
GRB_POS_XRT_Z:   -66.82
IMAGE_URL:       sw00163136000msxim.img
SUN_POSTN:       224.27d {+14h 57m 04s}  -16.84d {-16d 50' 12"}
SUN_DIST:        112.97 [deg]
MOON_POSTN:      320.25d {+21h 21m 00s}  -20.08d {-20d 04' 53"}
MOON_DIST:        61.66 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:       91.46,-11.43 [deg] galactic lon,lat of the burst
ECL_COORDS:      352.74, 48.49 [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:     Wed 09 Nov 05 01:14:54 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     163136,   Seg_Num: 0
GRB_RA:          330.3149d {+22h 01m 15.5s} (J2000),
                 330.3760d {+22h 01m 30.2s} (current),
                 329.7939d {+21h 59m 10.5s} (1950)
GRB_DEC:         +40.8227d {+40d 49' 21.7"} (J2000),
                 +40.8510d {+40d 51' 03.7"} (current),
                 +40.5815d {+40d 34' 53.2"} (1950)
GRB_ERROR:       5.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       611.81 [arb]
GRB_SIGNIF:      6.92 [sigma]
IMG_START_DATE:  13683 TJD;   313 DOY;   05/11/09
IMG_START_TIME:  4460.18 SOD {01:14:20.18} UT,   119.7 [sec] since BAT Trigger Time
TAM[0-3]:        327.61 237.18 261.26 243.13
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       224.27d {+14h 57m 04s}  -16.84d {-16d 50' 12"}
SUN_DIST:        112.97 [deg]
MOON_POSTN:      320.25d {+21h 21m 00s}  -20.08d {-20d 04' 53"}
MOON_DIST:        61.66 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:       91.46,-11.43 [deg] galactic lon,lat of the burst
ECL_COORDS:      352.74, 48.49 [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:     Wed 09 Nov 05 01:15:10 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     163136,   Seg_Num: 0
GRB_RA:          330.3149d {+22h 01m 15.5s} (J2000),
                 330.3760d {+22h 01m 30.2s} (current),
                 329.7939d {+21h 59m 10.5s} (1950)
GRB_DEC:         +40.8227d {+40d 49' 21.7"} (J2000),
                 +40.8510d {+40d 51' 03.7"} (current),
                 +40.5815d {+40d 34' 53.2"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       48 [cnts]
IMG_START_DATE:  13683 TJD;   313 DOY;   05/11/09
IMG_START_TIME:  4460.18 SOD {01:14:20.18} UT,   119.7 [sec] since BAT Trigger Time
CENTROID_X:      270.71,  raw= 271  [pixels]
CENTROID_Y:      338.01,  raw= 338  [pixels]
ROLL:            267.13 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   89.41
GRB_POS_XRT_Z:   -66.82
IMAGE_URL:       sw00163136000msxim.img
SUN_POSTN:       224.27d {+14h 57m 04s}  -16.84d {-16d 50' 12"}
SUN_DIST:        112.97 [deg]
MOON_POSTN:      320.25d {+21h 21m 00s}  -20.08d {-20d 04' 53"}
MOON_DIST:        61.66 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:       91.46,-11.43 [deg] galactic lon,lat of the burst
ECL_COORDS:      352.74, 48.49 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 09 Nov 05 01:15:56 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     163136,   Seg_Num: 0
GRB_RA:          330.296d {+22h 01m 11s} (J2000),
                 330.357d {+22h 01m 26s} (current),
                 329.775d {+21h 59m 06s} (1950)
GRB_DEC:         +40.837d {+40d 50' 15"} (J2000),
                 +40.866d {+40d 51' 57"} (current),
                 +40.596d {+40d 35' 46"} (1950)
GRB_DATE:        13683 TJD;   313 DOY;   05/11/09
GRB_TIME:        4340.52 SOD {01:12:20.52} UT
TRIGGER_INDEX:   265
GRB_PHI:           7.35 [deg]
GRB_THETA:        53.59 [deg]
DELTA_TIME:      44.00 [sec]
TRIGGER_DUR:     2.048 [sec] 
LC_URL:          sw00163136000msb.lc
SUN_POSTN:       224.27d {+14h 57m 04s}  -16.84d {-16d 50' 11"}
SUN_DIST:        112.96 [deg]
MOON_POSTN:      320.23d {+21h 20m 56s}  -20.09d {-20d 05' 18"}
MOON_DIST:        61.68 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:       91.46,-11.41 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      352.73, 48.51 [deg] ecliptic lon,lat of the pointing direction
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.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 09 Nov 05 01:16:08 UT
NOTICE_TYPE:     Swift-XRT Lightcurve
TRIGGER_NUM:     163136,   Seg_Num: 0
POINT_RA:        330.340d {+22h 01m 22s} (J2000)
POINT_DEC:       +40.849d {+40d 50' 56"} (J2000)
LC_START_DATE:   13683 TJD;   313 DOY;   05/11/09
LC_START_TIME:   4465.36 SOD {01:14:25.36} UT,   124.8 [sec] since BAT Trigger Time
LC_STOP_DATE:    13683 TJD;   313 DOY;   05/11/09
LC_STOP_TIME:    4551.41 SOD {01:15:51.41} UT
LC_LIVE_TIME:    86.00 [sec], 99.9%
DELTA_TIME:      86313.95 [sec]
N_BINS:          80
TERM_COND:       2
LC_URL:          sw00163136000msx.lc
SUN_POSTN:       224.27d {+14h 57m 04s}  -16.84d {-16d 50' 12"}
SUN_DIST:        112.99 [deg]
MOON_POSTN:      320.25d {+21h 21m 00s}  -20.08d {-20d 04' 52"}
MOON_DIST:        61.68 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:       91.50,-11.42 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      352.78, 48.50 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-XRT Lightcurve.  
COMMENTS:        This Lightcurve was terminated by the 'Snapshot End' condition.

GCN NOTICE

 
TITLE:           GCN/SWIFT NOTICE 
NOTICE_DATE:     Wed 09 Nov 05 01:16:47 UT 
NOTICE_TYPE:     Swift-UVOT Source List 
TRIGGER_NUM:     163136,   Seg_Num: 0 
POINT_RA:        330.338d {+22h 01m 21s} (J2000) 
POINT_DEC:       +40.850d {+40d 51' 02"} (J2000) 
POINT_ROLL:      267.134d 
IMG_START_DATE:  13683 TJD;   313 DOY;   05/11/09 
IMG_START_TIME:  4463.24 SOD {01:14:23.24} UT,   122.7 [sec] since BAT Trigger Time 
FILTER:          3, V 
BKG_MEAN:        0.360 
N_STARS:         169 
X_OFFSET:        333 [pixels] 
Y_OFFSET:        506 [pixels] 
X_MAX:           1292 [pixels] 
Y_MAX:           1465 [pixels] 
DET_THRESH:      6 
PHOTO_THRESH:    2 
SL_URL:          sw00163136000msufc0122.fits 
SUN_POSTN:       224.27d {+14h 57m 04s}  -16.84d {-16d 50' 12"} 
SUN_DIST:        112.99 [deg] 
MOON_POSTN:      320.25d {+21h 21m 00s}  -20.08d {-20d 04' 52"} 
MOON_DIST:        61.69 [deg] 
MOON_ILLUM:      50 [%] 
GAL_COORDS:       91.50,-11.42 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      352.78, 48.51 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 09 Nov 05 01:17:49 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     163136,   Seg_Num: 0
POINT_RA:        330.338d {+22h 01m 21s} (J2000)
POINT_DEC:       +40.850d {+40d 51' 02"} (J2000)
ROLL:            267.134d
IMG_START_DATE:  13683 TJD;   313 DOY;   05/11/09
IMG_START_TIME:  4463.24 SOD {01:14:23.24} UT,   122.7 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     153191663
X_OFFSET:        653 [pixels]
Y_OFFSET:        826 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       813
Y_GRB_POS:       986
BINNING_INDEX:   1
IM_URL:          sw00163136000msuni0122.fits
SUN_POSTN:       224.27d {+14h 57m 04s}  -16.84d {-16d 50' 12"}
SUN_DIST:        112.99 [deg]
MOON_POSTN:      320.25d {+21h 21m 00s}  -20.08d {-20d 04' 52"}
MOON_DIST:        61.69 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:       91.50,-11.42 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      352.78, 48.51 [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:     Wed 09 Nov 05 01:18:06 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     163136,   Seg_Num: 0
POINT_RA:        330.338d {+22h 01m 21s} (J2000)
POINT_DEC:       +40.850d {+40d 51' 02"} (J2000)
ROLL:            267.134d
IMG_START_DATE:  13683 TJD;   313 DOY;   05/11/09
IMG_START_TIME:  4463.24 SOD {01:14:23.24} UT,   122.7 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     153191663
X_OFFSET:        653 [pixels]
Y_OFFSET:        826 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       813
Y_GRB_POS:       986
BINNING_INDEX:   1
IM_URL:          sw00163136000msuni0122.fits
SUN_POSTN:       224.27d {+14h 57m 04s}  -16.84d {-16d 50' 12"}
SUN_DIST:        112.99 [deg]
MOON_POSTN:      320.25d {+21h 21m 00s}  -20.08d {-20d 04' 52"}
MOON_DIST:        61.69 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:       91.50,-11.42 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      352.78, 48.51 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 09 Nov 05 01:18:08 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     163136,   Seg_Num: 0
POINT_RA:        330.338d {+22h 01m 21s} (J2000)
POINT_DEC:       +40.850d {+40d 51' 02"} (J2000)
POINT_ROLL:      267.134d
IMG_START_DATE:  13683 TJD;   313 DOY;   05/11/09
IMG_START_TIME:  4463.24 SOD {01:14:23.24} UT,   122.7 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        0.360
N_STARS:         169
X_OFFSET:        333 [pixels]
Y_OFFSET:        506 [pixels]
X_MAX:           1292 [pixels]
Y_MAX:           1465 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00163136000msufc0122.fits
SUN_POSTN:       224.27d {+14h 57m 04s}  -16.84d {-16d 50' 12"}
SUN_DIST:        112.99 [deg]
MOON_POSTN:      320.25d {+21h 21m 00s}  -20.08d {-20d 04' 52"}
MOON_DIST:        61.69 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:       91.50,-11.42 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      352.78, 48.51 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #4211
E.S. Rykoff (U Mich), B. Schaefer (Louisiana State), W. Rujopakarn (U Mich), F. Yuan (U Mich), R. Quimby (U Texas), report on behalf of the ROTSE collaboration:
ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB 051109 (Swift trigger 163136). The first image was at 01:12:52.7 UT, 32.1 s after the burst (4.7 s after the GCN notice time). The unfiltered images are calibrated relative to USNO A2.0. We detect a new object, not visible in the DSS (second epoch), with coordinates:
22:01:15.3 +40:49:23.3 (J2000)
```
 
start UT        mag     mlim(of image) 
---------------------------------- 
01:12:52.7     15.4     16.8 
```
Continuing observations are in progress.
GCN Circular #4212
J. S. Bloom, on behalf of a larger collaboration, reports:
"The Peters Automated Infrared Imaging Telescope (PAIRITEL) autonomously began observing the field of GRB 051109a (Swift trigger 163136) at 2005-11-09 01:13:55.59 UTC (1min35 sec after the trigger). In the first several individual 7.8 second exposures we detected the candidate afterglow proposed by Rykoff et al. (GCN #4211) in simultaneous J, H, and Ks imaging. Further observations are in progress as well as analysis."
Josh
GCN Circular #4213
G. Tagliaferri (INAF-OAB), S. Barthelmy (GSFC), D. Burrows (PSU), M. Chester (PSU), N. Gehrels (GSFC), J. Hill (GSFC/USRA), S. T. Holland (GSFC/USRA), J. Kennea (PSU), F. Marshall (GSFC), T. Mineo (INAF-IASFPA), D. Palmer (LANL), T. Sakamoto (GSFC), on behalf of the Swift team:
At 01:12:20 UT, Swift-BAT triggered and located GRB051109 (trigger=163136). The spacecraft slewed immediately. The BAT on-board calculated location is RA,Dec= 330.296d, +40.837d {22h 01m 11s, +40d 50' 15"} (J2000), with an uncertainty of 3 arcmin (radius, 90% containment, stat+sys). The BAT light curve showed a multi-peak structure with a total duration of at least 25 sec. The peak count rate was ~2000 counts/sec (15-350 keV), at ~2 seconds after the trigger.
The XRT began observing at 01:14:20 UT, 120 seconds after the BAT trigger. The XRT on-board software located a bright, previously uncatalogued, fading point source in the field at the following location:
```
RA(J2000):   22:01:15.5,
Dec(J2000): +40:49:21.7,
```
with an estimated uncertainty of 5.8 arcseconds (90% containment). This position lies 74 arcseconds from the BAT position reported above, and 2.8 arcseconds from the ROTSE position (Rykoff et al., GCN 4211). The initial flux estimate of this source is 1.1 x 10^-9 erg/s/cm^2.
The UVOT began observing at 01:14:23, 123 seconds after the BAT trigger. A bright, uncataloged source is apparent at RA,dec=330.3136,+40.8231 {22h01m15.26s, +40o49'23.2"} (J2000), coincident with the position of the ROTSE detection. The V-band magnitude is approximately 17; this magnitude is based on an on-board source detection algorithm and a more accurate brightness will be available following analysis of the full data set. V-band extinction in the direction of the UVOT position is A_V = 0.63.
JCG: Info:
The following four UVOT messages were sent again, most likely due to missing information in the first transmission.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 09 Nov 05 02:16:26 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     163136,   Seg_Num: 0
POINT_RA:        330.279d {+22h 01m 07s} (J2000)
POINT_DEC:       +40.854d {+40d 51' 15"} (J2000)
POINT_ROLL:      267.083d
IMG_START_DATE:  13683 TJD;   313 DOY;   05/11/09
IMG_START_TIME:  7782.36 SOD {02:09:42.36} UT,   3441.8 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        2.011
N_STARS:         180
X_OFFSET:        476 [pixels]
Y_OFFSET:        555 [pixels]
X_MAX:           1435 [pixels]
Y_MAX:           1514 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00163136000msufc3441.fits
SUN_POSTN:       224.31d {+14h 57m 14s}  -16.85d {-16d 50' 52"}
SUN_DIST:        112.93 [deg]
MOON_POSTN:      320.79d {+21h 23m 10s}  -19.89d {-19d 53' 14"}
MOON_DIST:        61.41 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:       91.46,-11.38 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      352.73, 48.53 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 09 Nov 05 02:16:47 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     163136,   Seg_Num: 0
POINT_RA:        330.279d {+22h 01m 07s} (J2000)
POINT_DEC:       +40.854d {+40d 51' 15"} (J2000)
POINT_ROLL:      267.083d
IMG_START_DATE:  13683 TJD;   313 DOY;   05/11/09
IMG_START_TIME:  7782.36 SOD {02:09:42.36} UT,   3441.8 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        2.011
N_STARS:         180
X_OFFSET:        476 [pixels]
Y_OFFSET:        555 [pixels]
X_MAX:           1435 [pixels]
Y_MAX:           1514 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00163136000msufc3441.fits
SUN_POSTN:       224.31d {+14h 57m 14s}  -16.85d {-16d 50' 52"}
SUN_DIST:        112.93 [deg]
MOON_POSTN:      320.79d {+21h 23m 10s}  -19.89d {-19d 53' 14"}
MOON_DIST:        61.41 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:       91.46,-11.38 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      352.73, 48.53 [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:     Wed 09 Nov 05 02:17:50 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     163136,   Seg_Num: 0
POINT_RA:        330.279d {+22h 01m 07s} (J2000)
POINT_DEC:       +40.854d {+40d 51' 15"} (J2000)
ROLL:            267.083d
IMG_START_DATE:  13683 TJD;   313 DOY;   05/11/09
IMG_START_TIME:  7782.36 SOD {02:09:42.36} UT,   3441.8 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     153194982
X_OFFSET:        795 [pixels]
Y_OFFSET:        874 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       955
Y_GRB_POS:       1034
BINNING_INDEX:   1
IM_URL:          sw00163136000msuni3441.fits
SUN_POSTN:       224.31d {+14h 57m 14s}  -16.85d {-16d 50' 52"}
SUN_DIST:        112.93 [deg]
MOON_POSTN:      320.79d {+21h 23m 10s}  -19.89d {-19d 53' 14"}
MOON_DIST:        61.41 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:       91.46,-11.38 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      352.73, 48.53 [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:     Wed 09 Nov 05 02:18:36 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     163136,   Seg_Num: 0
POINT_RA:        330.279d {+22h 01m 07s} (J2000)
POINT_DEC:       +40.854d {+40d 51' 15"} (J2000)
ROLL:            267.083d
IMG_START_DATE:  13683 TJD;   313 DOY;   05/11/09
IMG_START_TIME:  7782.36 SOD {02:09:42.36} UT,   3441.8 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     153194982
X_OFFSET:        795 [pixels]
Y_OFFSET:        874 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       955
Y_GRB_POS:       1034
BINNING_INDEX:   1
IM_URL:          sw00163136000msuni3441.fits
SUN_POSTN:       224.31d {+14h 57m 14s}  -16.85d {-16d 50' 52"}
SUN_DIST:        112.93 [deg]
MOON_POSTN:      320.79d {+21h 23m 10s}  -19.89d {-19d 53' 14"}
MOON_DIST:        61.41 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:       91.46,-11.38 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      352.73, 48.53 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        All 4 attachments are included.

GCN Circular #4214
B. E. Schaefer (Louisiana State), E.S. Rykoff (U Mich), W. Rujopakarn (U Mich), F. Yuan (U Mich), R. Quimby (U Texas), K. Alatalo (Berkeley), T.A. McKay (U Mich), C. Akerlof (U Mich), report on behalf of the ROTSE collaboration:
A fast fading optical transient has been discovered inside the error circle for GRB 051109A (Swift trigger 163136) by the ROTSE-IIIb telescope, located at McDonald Observatory (cf. Rykoff et al. GCN 4211). The source faded as a power law. At the central time of UT 01:16:05 (228 seconds after the Swift trigger), the magnitude was 16.21. (Magnitudes are unfiltered and calibrated against R-band magnitudes for nearby comparison stars.) The source is continuing to fade, but accurate magnitudes will have to await a more detailed analysis due to nearby faint stars.
With these magnitudes, the power law index for the decline is -0.4. If this decline continues unbroken, then at a time around two hours after the burst (UT 03:12), the magnitude should be 17.7. Eight hours after the burst (UT 09:12), a magnitude of 18.3 might be expected.
GCN Circular #4215
N. Mirabal (U. Michigan), J. P. Halpern, and S. Tonnesen (Columbia U.) report on behalf of the MDM Observatory GRB follow-up team:
"We are observing the afterglow of Swift GRB 051109 detected by ROTSE-IIIb (Rykoff et al. GCN #4211, Schaefer et al. GCN #4214) using the MDM 2.4m telescope and a Gunn r filter under partly cloudy conditions. From 38 minutes to 148 minutes after the burst, the OT faded from R = 18.21 +/- 0.05 to R = 19.22 +/- 0.08. Magnitudes are referenced to a USNO B1.0 star at 22h01m14.60s +40d49'25.3" (J2000) having R=17.23. This corresponds to a power-law decay index of -0.68. Observations are continuing."
GCN Circular #4216
J. S. Bloom (UC Berkeley), C. H. Blake (Harvard), D. Starr (Gemini) and K. Alatalo (UC Berkeley) report:
"We have continued to observe the field of GRB 051109a (Tagliaferri et al. 4213) at the position of the optical transient (GCNs 4211, 4214, 4215). Using a stack of PAIRITEL imaging from 2005-11-09 01:18:42.25 to 2005-11-09 01:33:14.94 UTC we find a 2MASS calibrated photometry of J = 15.69 +/- 0.03, H = 14.95 +/- 0.03, Ks = 14.44 +/- 0.04. We also find an astrometric position of (J2000) 22:01:15.313, +40:49:23.31 with an uncertainty of 100 mas in each axis. This is consistent with the Rykoff et al. position."
This message may be cited
GCN Circular #4217
E. Fenimore (LANL), L. Angelini (GSFC-JHU), L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/NRC), N. Gehrels (GSFC), J. Greiner (MPE), D. Hullinger (UMD), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/NRC), G. Sato (ISAS), J. Tueller (GSFC), on behalf of the Swift-BAT team:
Using the data set from T-60 to T+70 sec from the recent telemetry downlink, we report further analysis of BAT GRB 051109 (trigger #163136) (Tagliaferri, et al., GCN 4213). The BAT ground-calculated position is (RA,Dec) = 330.295, +40.836 {22h 01m 10.7s, +40d 50' 10.5"} [deg; J2000] +-2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 9%.
The lightcurve has two peaks. The initial strong peak starts at T-5 sec with a duration of 20 sec. The second weaker peak starts at T+21 sec. with a duration of 20 sec. T90 (15-350 keV) is (36 +- 2) sec (estimated error including systematics).
The power law index of the time-averaged spectrum is 1.5 +- 0.2. The fluence in the 15-150 keV band is (2.1 +- 0.3) x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T0+0.4 sec in the 15-150 keV band is (3.7 +- 0.7) ph/cm2/sec. All the quoted errors are at the 90% confidence level.
GCN Circular #4218
P. A. Milne, G. G. Williams (U. of Arizona), H. S. Park (LLNL), S. Barthelmy (GSFC)
The automated 0.6-m Super-LOTIS telescope began observations of the error region of GRB051109 (Swift trigger 163136) at 01:13:03.6 UT, 43.0 seconds after the burst. The OT detected by the Rykoff et al. (GCN 4211) is clearly visible in the first image and subsequent images. We confirm that the OT has faded in images taken 13 minutes after the burst.
The R-band magnitude of the afterglow in the first image is:
```
UT Time         Delta-Time  R magnitude     error
01:13:03.6      43.0 s       15.27           0.13
```
Reported magnitudes are relative to the R1 magnitudes of five stars in the USNO-B catalog.
Additional observations are underway.
GCN Circular #4219
K. Torii (Osaka U.) reports:
The error region of GRB 051109 (Tagliaferri et al. GCN 4213) was observed by the 0.3 m telescopes in the New Mexico Skies Observatory. Starting at 01:17:46 UT (326 s after the burst), 120 s exposures in Ic band was obtained. We also observed the field in Rc band (120 s exposures) with another 0.3 m telescope at the same site, starting at 01:29:39 UT.
As a result of the preliminary analysis, the optical afterglow (Rykoff et al. GCN 4211) is detected in Ic band as follows, relative to USNO-B1.0 I magnitude.
```
------------------------------------------
StartUT	Filter	Mag	Nframes
------------------------------------------
01:25:25 Ic	16.6	1
------------------------------------------
```
GCN Circular #4220
J. Haislip, M. Nysewander, M. Bayliss, A. LaCluyze, D. Reichart, J. A. Crain, and A. Foster report on behalf of the UNC team of the FUN GRB Collaboration.
Under the control of Skynet, PROMPT Temporary Telescope 3 automatically observed the localization of GRB 051109 (Tagliaferri et al., GCN 4213) beginning 1.7 min after the burst in repeating blocks of B and V.
PROMPT Temporary Telescope 5 joined PROMPT-3 15.6 min after the burst in repeating blocks Rc and Ic. These observations were carried out in synch with PROMPT-3's observations.
We detect the afterglow (Rykoff et al., GCN 4211) in single V, Rc, and Ic exposures and measure its brightness to be V ~ 16.6 mag at 3.3 min after the burst.
PROMPT is still being built and commissioned.
GCN Circular #4221
R. Quimby (U. Texas), D. Fox (PSU), P. Hoeflich (U. Texas), B. Roman, and J. C. Wheeler (U. Texas) report:
We observed the optical afterglow (Rykoff et al. GCN 4211) of GRB 051109 (Tagliaferri et al. GCN 4213) with the 9.2m Hobby-Eberly Telescope (+ Marcario Low-Resolution Spectrograph) beginning November 9, 03:55:40 UT (~2.5 hrs after the burst trigger). Several absorption lines are present in the spectrum corresponding to Si II (1526.7), C IV, Cr II (2056.3, 2066.2), and Fe II (2344.2, 2382.8) among others at a redshift of z=2.346.
GCN Circular #4227
M. Jel=EDnek, A. de Ugarte Postigo, A. J. Castro-Tirado, S. Vitek, J. Gorosabel, S. B. Pandey and S. S. Guziy (IAA-CSIC Granada), P. Kubanek (ISDC Versoix, and ASU AV CR Ondrejov) and R. Hudec (ASU AV CR)
report:
"BOOTES-1B in El Arenosillo (southern Spain), responded to the GRB 051109a trigger (Tagliaferri et al. GCNC 4213). A sequence of exposures started at 01:13:15.3 UT (54.8s after the GRB, 27s after the GCN notice), simultaneously in the R and I-bands. We detect the optical afterglow first reported by Rykoff et al. (GCNC 4211) in both passbands. The approximate magnitude on the first 10s R-band image is 16.2 calibrated against USNO-A2.0. Further analysis is in progress."
This message may be cited.
GCN Circular #4228
S. Campana (INAF-OAB), T. Mineo (INAF-IASFPA), G. Tagliaferri (INAF-OAB), V. Mangano (INAF-IASFPA), P. Romano (INAF-OAB), D.N. Burrows (PSU) on behalf of the Swift/XRT team:
We have analysed 10 ks of XRT observations of GRB051109 (Tagliaferri et al., GCN 4213). The afterglow is bright and well detected. The refined coordinates for this X-ray afterglow are:
```
RA(J2000):   22 01 15.3
Dec(J2000): +40 49 24
```
with an estimated uncertainty of 3.5 arcsec (90% containment) and including the latest XRT boresight correction. The position is 3.2 arcsec from the on-board position reported by Tagliaferri et al. (and 1.2 arcsec from the one by UVOT, ibid.) and 0.9 arcsec from the optical afterglow first detected by ROTSE (Rykoff et al., GCN 4211).
The X-ray light-curve shows a clear break between the first and the second Swift orbit (close to the end of the first orbit). In the first part the decay is very steep with index alpha_1=-3.1 +/- 0.6 (90% containment) whereas in the second part it flattens to alpha_2=-0.6 +/- 0.2.
The spectrum of the full data (WT and PC) can be modelled with a power-law with photon index Gamma = 2.07 +/- 0.08 (90% containment). There is evidence for an absorbing column higher than the Galactic value (1.9e21 cm^-2) at a level of (8.2+/-5.2)e21 cm^-2 at the observed redshift z=2.346 (Quimby et al., GCN 4221).
At 150 s the 0.5-10 keV unabsorbed flux was 3.2e-10 erg cm^-2 s^-1. At 5000 s the afterglow had faded to flux level of 2.4e-11 erg cm^-2 s^-1. Assuming the currect decay (which is very flat) we predict a flux of ~5e-12 erg cm^-2 s^-1 at 1 d from the burst.
GCN Circular #4229
S. Campana (INAF-OAB), T. Mineo (INAF-IASFPA), G. Tagliaferri (INAF-OAB), V. Mangano (INAF-IASFPA), P. Romano (INAF-OAB) on behalf of the Swift/XRT team:
After the analysis of the full initial dataset, we see that the light curve of GRB051109A shows a further break besides the one already highlighted previously (Campana et al., GCN 4228). This second break is relatively unconstrained occurring between the first (<200 s) and the second (>3000 s) Swift orbit. In the first part the decay is very steep with index alpha_1=-3.1 +/- 0.6 (90% containment, as reported). The second power law contains basically no data and it is only loosely constrained. The third power law has alpha_3=-1.2 +/- 0.1. The reduced chi2 is 1.2 (57 dof). The expected flux at 1 day is 8e-13 erg cm^-2 s^-1.
GCN Circular #4230
GRB 051109A : Lulin BVRI Optical afterglow observation
F.Y. Huang, K.Y. Huang, W.H. Ip (NCU), Y. Urata(RIKEN), Y. Qiu (BAO), Y.Q. Lou (THCA) on behalf of EAFON report:
"We have observed GRB 051109A afterglow (Rykoff et al. GCN4211) using Lulin 1-m telescope from 9.59 to 13.34 hours after ther burst. The afterglow was detected in our B,V,R,I band images. The R band magnitude of afterglow at 10.97 UT is estimated as R=20.3 calibrated against USNO-B1.0 catalog.
Further analysis is in progress.
This message may be cited."
GCN Circular #4235
GRB 051109A: Swift-UVOT Observations
S. T. Holland (GSFC/USRA), S. Campana (INAF-OAB), P. Smith (UCL/MSSL), H. Huckle (UCL/MSSL), & N. Gehrels (GSFC) on behalf of the Swift-UVOT team report:
The Swift-UVOT began observing the field of GRB 051109A (BAT Trigger 163136; Palmer, et al. GCN Circular 4213) at 2005-11-09T01:14:09, 109 seconds after the burst.
We detect an optical transient at
```
RA(J2000) =  22:01:15.32
Dec(J2000) = +40:49:23.7
```
with a positional uncertainty of +/-0.5 arcsec (90% confidence), in agreement with the position of Rykoff, et al. (2005, GCN Circular 4211). The transient has V = 16.49 +/- 0.07 (1-sigma, statistical) in an 89 s exposure starting at 2005-11-09T01:14:23, 123 seconds after the BAT trigger. This value supercedes the approximate magnitude given in Palmer, et al. (2005, GCN Circular 4213). This magnitude has not been corrected for Galactic extinction.
Further observations and analysis are underway.
GCN Circular #4238
S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, and T. Cline on behalf of the Konus-Wind team report:
The long soft GRB 051109A (Swift-BAT trigger #163136; Tagliaferri et al., GCN 4213, E. Fenimore et al., GCN 4217) triggered Konus-Wind at T0= 4342.541 s UT (01:12:22.541).
As observed by Konus-Wind it had a single pulse with a duration about ~11 sec and a long decaying tail. This tail was seen up to ~130 sec after T0.
The preliminary analysis of the Konus-Wind data gave the burst fluence 4.0(-3.4, +0.3)10^-6 erg/cm2,and peak flux on 256-ms time scale 5.8(-4.9, +0.3)10^-7 erg/cm2/sec (both in the 20 - 500 keV energy range). These values are very uncertain due to weakness and softness of the burst.
The K-W spectrum integrated over the most intense part of the GRB (from T0 to T0+8.448 s) is well fitted (in the 20 - 500 keV range) by a power law with exponential cutoff model: dN/dE ~ E^(-alpha) * exp(-E/E0) with alpha = 1.25 (-0.59, +0.44) and E0 = 213 (-126, +246) keV (chi^2 = 56/56 dof). The peak energy Ep = 161 (-58, +224) keV.
All the quoted errors are at the 90% confidence level.
Assuming z = 2.346 (Quimby et al., GCN 4221) and a standard cosmology model with H_0 = 70 km/s/Mpc, Omega_M = 0.3, Omega_\Lambda = 0.7, the isotropic energy release is E_iso ~5x10^52 erg, the maximum luminosity is (L_iso)_max ~2.4x10^52 erg/s.
Further analysis and refinement is in progress.
GCN Circular #4239
P.R. Wozniak, W.T. Vestrand, J. Wren, R. White, S. Evans on behalf of the RAPTOR team report:
Starting at 01:12:54.42 UT on November 9, 33.9 seconds after the Swift BAT trigger, the Raptor-S robotic telescope at Los Alamos National Laboratory responded to Swift trigger 163136 (Tagliaferri et al., GCN 4213). The automated response was composed of a series of ten 5-second duration exposures followed by 20 10-second exposures and finally by 183 30-second exposures. The unfiltered images show an optical transient at the position identifed by Rykoff et al. (GCN 4211) that fades from magnitude R ~15.1 to ~17.5 over the course of 20 minutes. The unfiltered magnitudes were transformed to the R2 magnitude scale of the USNO B1.0 catalog. Short animations derived from the RAPTOR images can be viewed at:
EPISODE I: "The First Four Minutes" http://www.raptor.lanl.gov/images/GRB051109a/grb051109a_early_movie.gif
EPISODE II: "The Next Half Hour" http://www.raptor.lanl.gov/images/GRB051109a/grb051109a_late_movie.gif
GCN Circular #4240
W. Li, University of California, Berkeley, on behalf of the KAIT GRB team, report:
We remotely observed GRB 051109A (Tagliaferri et al., GCN 4213) with the 0.76-m Katzman Automatic Imaging Telescope (KAIT) at Lick Observatory, and detected the afterglow (Rykoff et al., GCN 4211) in a series of unfiltered exposures. The following photometry are measured (calibrated to the USNO B1.0 catalog):
```
           Start UT  Exp(s)    mag     err

2005-11-09 02:25:48  120.0    18.67   0.04  
2005-11-09 02:28:28  120.0    18.73   0.06
2005-11-09 02:31:05  240.0    18.75   0.05
2005-11-09 02:35:37  240.0    18.82   0.04
2005-11-09 02:40:14  360.0    18.80   0.04
2005-11-09 02:46:48  360.0    18.88   0.04
2005-11-09 02:53:27  600.0    18.93   0.04
```
Within this period (74.5 to 106.1 minutes after the burst), the afterglow declined with a power-law decay index of -0.62 +/- 0.07, consistent with the result resported by Mirabal et al. (GCN 4215).
GCN Circular #4243
Guy Pooley, MRAO, Cavendish Lab, University of Cambridge reports:
The Ryle Telescope (Cambridge, UK) was used to map the field containing GRB051109A (GCN 4211) at 15GHz. The observation ran from 2005Nov09 12h57m to 2005Nov10 00h54m, centred 17h45m after the initial detection. No source was detected at the position of the GRB (Rykoff et al, GCN 4211; Holland et al, GCN 4235); the formal value was S = 0.40 mJy with rms noise 0.16 mJy.
When the data were divided into two halves, the resulting estimates of flux density were
First half (centred on 2005Nov09.75) 0.25 +- 0.23 mJy
Second half (centred on 2005Nov10.25) 0.54 +- 0.23 mJy
GCN Circular #4244
Dale A. Frail (NRAO), P. Brian Cameron (Caltech), and Alicia M. Soderberg (Caltech) report on behalf of a larger collaboration:
"We observed the field of GRB 051109A (GCN 4213) with the Very Large Array at 8.5 GHz around November 11.15 UT. At the position of the optical transient (GCN 4211) there is a weak radio source with flux density 117 +- 24 uJy. We identify this as the radio afterglow of GRB 051109A.
The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc."
GCN Circular #4259
Kuntal Misra (ARIES, Nainital), Atish P. Kamble (Raman Research Institute, Bangalore), D. K. Sahu, S. Srividya, P. Bama, G.C. Anupama and Mr. S. Vanniarajan (Indian Institute of Astrophysics, Bangalore) on behalf of a larger Indian GRB collaboration
We observed the field of GRB 051109A (swift trigger=163136) using the 1-m Sampurnanand Telescope (ST) at ARIES, Naini Tal in Cousins R and I filters and the 2-m Himalayan Chandra Telescope (HCT), IAO, Hanle in Bessell B and V filters, starting nearly 12 hours after the burst. The Optical Transient (OT) mentioned by Rykoff et al. (GCN 4211) is clearly seen in images of 10 minutes exposure time. The preliminary magnitude of the OT in different bands in comparison to 5 nearby USNO-B1.0 stars is:
```
UT           Magnitude  error  Band   Telescope used
Nov 09.5681  19.449     0.08    I         ST
Nov 09.5796  20.715     0.09    R         ST
Nov 09.5463  22.044     0.09    B        HCT
```
The OT decayed by ~ 0.6 mag from Nov 09.5681 to Nov 09.7201 UT in R band and by 0.28 mag in B in ~2.4 hrs. Further analysis is in progress.
This message may be cited.
GCN Circular #4265
Pablo Saz Parkinson (UC Santa Cruz) on behalf of the Milagro collaboration reports:
We have searched Milagro data for emission at GeV/TeV energies from GRB 051109A (GCN Circ 4213, G. Tagliaferri et al.), during the burst duration (36 s) reported by the Swift team (GCN Circ 4217, E. Fenimore et al.). No evidence for prompt GeV/TeV emission was found. A preliminary analysis, assuming a differential photon spectral index of -2.4, gives an upper limit on E^2dN/dE at 99% confidence of:
E^2dN/dE at 2.5 TeV < 8.4 * 10^(-8) erg cm^(-2) (No EBL absorption assumed)
The spectrum of the host galaxy of the proposed afterglow of GRB 051109A implies a redshift of 2.346 (GCN Circ 4221, R. Quimby et al.). TeV photons are attenuated by pair production with infrared photons in intergalactic space so we also calculate upper limits assuming different extragalactic infrared background light (EBL) absorption models, one by Kneiske et al. 2004 (A&A 413, 807) and one by Primack et al. 2005 (AIP Conf. Proc. 745, p. 23). We find 99% confidence level upper limits on E^2dN/dE of:
E^2dN/dE at 55 GeV < 1.7 * 10^(-3) erg cm^(-2) (Primack et al. EBL model)
E^2dN/dE at 60 GeV < 2.3 * 10^(-4) erg cm^(-2) (Kneiske et al. EBL model)
The energies quoted represent the approximate median energy of the events that would be detected assuming a power law spectrum with differential index -2.4 convolved with each of the absorption models. These upper limits are preliminary and will be refined with further analysis.
GCN Circular #4273
E. Pavlenko (CrAO), K. Berezovsky (=F3SAS), V.Rumyantsev (CrAO), A.Pozanenko (IKI) on behalf of larger GRB follow up collaboration report:
We observed GRB051109A afterglow (Rykoff et al. GCN4211) with 0.38-m telescope in R band on Nov.9 between 15:51 and 17:34 (UT). Preliminary photometry of a stacked image against of USNO A2.0 is followi= ng:
```
Mid time,    Exposure, Filter, Mag.
(UT)           (s)

Nov. 9 16:43   120x50   R       20.7 +/- 0.2
```
The message may be cited.
GCN Circular #4295
K. Kinugasa (Gunma Astronomical Observatory) and K. Torii (Osaka U.) report:
The error region of GRB 051109A (Tagliaferri et al. GCN 4213) was imaged by the LN2 cooled CCD camera atattched on the 150 cm telescope of the Gunma Astronomical Observatory. Starting at 2005 November 9, 14:56 UT (0.57 days after the burst), nine 30 s and five 180 s exposures in Rc band were obtained.
In a stacked frame, the optical afterglow (Rykoff et al. GCN 4211) is detected as follows, relative to USNO-B1.0 R2 magnitude.
```
------------------------
MidUT   Filter  Mag
------------------------
15:08   Rc      20.5
------------------------
```

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Jochen Greiner, last update: 22-Nov-2005 [Disclaimer]