Gamma-ray Burst 110208A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Feb 11 21:11:11 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     445038,   Seg_Num: 0
GRB_RA:           22.484d {+01h 29m 56s} (J2000),
                  22.617d {+01h 30m 28s} (current),
                  21.883d {+01h 27m 32s} (1950)
GRB_DEC:         -20.628d {-20d 37' 41"} (J2000),
                 -20.571d {-20d 34' 16"} (current),
                 -20.886d {-20d 53' 09"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       5021 [cnts]    Image_Peak=214 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   137     E_range: 15-50 keV
BKG_INTEN:       33512 [cnts]
BKG_TIME:        76233.35 SOD {21:10:33.35} UT
BKG_DUR:         8 [sec]
GRB_DATE:        15600 TJD;    39 DOY;   11/02/08
GRB_TIME:        76246.34 SOD {21:10:46.34} UT
GRB_PHI:         158.85 [deg]
GRB_THETA:        13.78 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.48 [sigma]
IMAGE_SIGNIF:    7.81 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +1  -2  +0  +0 -54  +0 
SUN_POSTN:       322.17d {+21h 28m 40s}  -14.89d {-14d 53' 24"}
SUN_DIST:         57.55 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       19.40d {+01h 17m 35s}  +13.35d {+13d 20' 49"}
MOON_DIST:        34.07 [deg]
MOON_ILLUM:      27 [%]
GAL_COORDS:      178.52,-79.07 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       12.28,-27.75 [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 = 295.08,2.05 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Feb 11 21:12:13 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     445038,   Seg_Num: 0
POINT_RA:         22.497d {+01h 29m 59s} (J2000)
POINT_DEC:       -20.620d {-20d 37' 10"} (J2000)
IMG_START_DATE:  15600 TJD;    39 DOY;   11/02/08
IMG_START_TIME:  76326.47 SOD {21:12:06.47} UT,   80.1 [sec] since BAT Trigger Time
COUNTS:          4    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        1    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Feb 11 21:14:36 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     445038,   Seg_Num: 0
GRB_RA:           22.484d {+01h 29m 56s} (J2000),
                  22.617d {+01h 30m 28s} (current),
                  21.883d {+01h 27m 32s} (1950)
GRB_DEC:         -20.628d {-20d 37' 41"} (J2000),
                 -20.571d {-20d 34' 16"} (current),
                 -20.886d {-20d 53' 09"} (1950)
GRB_DATE:        15600 TJD;    39 DOY;   11/02/08
GRB_TIME:        76246.34 SOD {21:10:46.34} UT
TRIGGER_INDEX:   137
GRB_PHI:         158.85 [deg]
GRB_THETA:        13.78 [deg]
DELTA_TIME:      -18.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.48 [sigma]
IMAGE_SIGNIF:    7.81 [sigma]
LC_URL:          sw00445038000msb.lc
SUN_POSTN:       322.17d {+21h 28m 41s}  -14.89d {-14d 53' 22"}
SUN_DIST:         57.55 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       19.42d {+01h 17m 42s}  +13.36d {+13d 21' 24"}
MOON_DIST:        34.07 [deg]
MOON_ILLUM:      27 [%]
GAL_COORDS:      178.52,-79.07 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       12.28,-27.75 [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 = 295.08,2.05 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Feb 11 21:15:02 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     445038,   Seg_Num: 0
POINT_RA:         22.497d {+01h 29m 59s} (J2000)
POINT_DEC:       -20.620d {-20d 37' 10"} (J2000)
POINT_ROLL:      265.123d
IMG_START_DATE:  15600 TJD;    39 DOY;   11/02/08
IMG_START_TIME:  76331.12 SOD {21:12:11.12} UT,   84.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.415
N_STARS:         19
X_OFFSET:        519 [pixels]
Y_OFFSET:        459 [pixels]
X_MAX:           1478 [pixels]
Y_MAX:           1418 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00445038000msufc0084.fits
SUN_POSTN:       322.17d {+21h 28m 41s}  -14.89d {-14d 53' 21"}
SUN_DIST:         57.56 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       19.43d {+01h 17m 43s}  +13.36d {+13d 21' 28"}
MOON_DIST:        34.07 [deg]
MOON_ILLUM:      27 [%]
GAL_COORDS:      178.52,-79.05 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       12.30,-27.75 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Feb 11 21:15:29 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     445038,   Seg_Num: 0
POINT_RA:         22.497d {+01h 29m 59s} (J2000)
POINT_DEC:       -20.620d {-20d 37' 10"} (J2000)
POINT_ROLL:      265.123d
IMG_START_DATE:  15600 TJD;    39 DOY;   11/02/08
IMG_START_TIME:  76331.12 SOD {21:12:11.12} UT,   84.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.415
N_STARS:         19
X_OFFSET:        519 [pixels]
Y_OFFSET:        459 [pixels]
X_MAX:           1478 [pixels]
Y_MAX:           1418 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00445038000msufc0084.fits
SUN_POSTN:       322.17d {+21h 28m 41s}  -14.89d {-14d 53' 21"}
SUN_DIST:         57.56 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       19.43d {+01h 17m 44s}  +13.36d {+13d 21' 33"}
MOON_DIST:        34.07 [deg]
MOON_ILLUM:      27 [%]
GAL_COORDS:      178.52,-79.05 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       12.30,-27.75 [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:     Tue 08 Feb 11 21:16:39 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     445038,   Seg_Num: 0
GRB_RA:           22.4640d {+01h 29m 51.35s} (J2000),
                  22.5974d {+01h 30m 23.37s} (current),
                  21.8632d {+01h 27m 27.17s} (1950)
GRB_DEC:         -20.5924d {-20d 35' 32.6"} (J2000),
                 -20.5353d {-20d 32' 07.0"} (current),
                 -20.8502d {-20d 51' 00.8"} (1950)
GRB_ERROR:       3.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15600 TJD;    39 DOY;   11/02/08
IMG_START_TIME:  76343.00 SOD {21:12:23.00} UT,   96.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       322.17d {+21h 28m 41s}  -14.89d {-14d 53' 20"}
SUN_DIST:         57.53 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       19.44d {+01h 17m 46s}  +13.36d {+13d 21' 45"}
MOON_DIST:        34.04 [deg]
MOON_ILLUM:      27 [%]
GAL_COORDS:      178.31,-79.06 [deg] galactic lon,lat of the burst
ECL_COORDS:       12.28,-27.71 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Feb 11 21:16:54 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     445038,   Seg_Num: 0
POINT_RA:         22.497d {+01h 29m 59s} (J2000)
POINT_DEC:       -20.620d {-20d 37' 10"} (J2000)
ROLL:            265.123d
IMG_START_DATE:  15600 TJD;    39 DOY;   11/02/08
IMG_START_TIME:  76331.12 SOD {21:12:11.12} UT,   84.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     318892337
X_OFFSET:        838 [pixels]
Y_OFFSET:        778 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       998
Y_GRB_POS:       938
BINNING_INDEX:   1
IM_URL:          sw00445038000msuni0091.fits
SUN_POSTN:       322.17d {+21h 28m 41s}  -14.89d {-14d 53' 20"}
SUN_DIST:         57.56 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       19.44d {+01h 17m 46s}  +13.36d {+13d 21' 48"}
MOON_DIST:        34.07 [deg]
MOON_ILLUM:      27 [%]
GAL_COORDS:      178.52,-79.05 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       12.30,-27.75 [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:     Tue 08 Feb 11 21:17:05 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     445038,   Seg_Num: 0
POINT_RA:         22.497d {+01h 29m 59s} (J2000)
POINT_DEC:       -20.620d {-20d 37' 10"} (J2000)
ROLL:            265.123d
IMG_START_DATE:  15600 TJD;    39 DOY;   11/02/08
IMG_START_TIME:  76331.12 SOD {21:12:11.12} UT,   84.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     318892337
X_OFFSET:        838 [pixels]
Y_OFFSET:        778 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       998
Y_GRB_POS:       938
BINNING_INDEX:   1
IM_URL:          sw00445038000msuni0091.fits
SUN_POSTN:       322.17d {+21h 28m 41s}  -14.89d {-14d 53' 20"}
SUN_DIST:         57.56 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       19.44d {+01h 17m 47s}  +13.36d {+13d 21' 49"}
MOON_DIST:        34.07 [deg]
MOON_ILLUM:      27 [%]
GAL_COORDS:      178.52,-79.05 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       12.30,-27.75 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #11674
V. D'Elia (ASDC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), D. N. Burrows (PSU), S. Campana (INAF-OAB), N. Gehrels (NASA/GSFC), J. M. Gelbord (PSU), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), N. P. M. Kuin (UCL-MSSL), C. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), T. Sakamoto (NASA/UMBC), M. H. Siegel (PSU), E. Sonbas (GSFC/USRA/Adiyaman Univ.), G. Stratta (ASDC), C. A. Swenson (PSU) and E. Troja (NASA/GSFC/ORAU) report on behalf of the Swift Team:
At 21:10:46 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 110208A (trigger=445038). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 22.484, -20.628 which is
```
   RA(J2000)  =  01h 29m 56s
   Dec(J2000) = -20d 37' 41"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows one peak with a duration of about 15 sec. The peak count rate was ~1200 counts/sec (15-350 keV), at 0 sec after the trigger.
The XRT began observing the field at 21:12:06.5 UT, 80.1 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 22.46404, -20.59248 which is equivalent to:
```
   RA(J2000)  = 01h 29m 51.37s
   Dec(J2000) = -20d 35' 32.9"
```
with an uncertainty of 3.9 arcseconds (radius, 90% containment). This location is 145 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 2.31 x 10^20 cm^-2 (Kalberla et al. 2005).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 84 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers none of the XRT error circle. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.02.
Burst Advocate for this burst is V. D'Elia (delia AT asdc.asi.it). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Feb 11 21:22:38 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     445038,   Seg_Num: 0
POINT_RA:         22.496d {+01h 29m 59s} (J2000)
POINT_DEC:       -20.619d {-20d 37' 06"} (J2000)
POINT_ROLL:      265.122d
IMG_START_DATE:  15600 TJD;    39 DOY;   11/02/08
IMG_START_TIME:  76544.17 SOD {21:15:44.17} UT,   297.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.874
N_STARS:         29
X_OFFSET:        279 [pixels]
Y_OFFSET:        219 [pixels]
X_MAX:           1718 [pixels]
Y_MAX:           1658 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00445038000msufc0297.fits
SUN_POSTN:       322.18d {+21h 28m 42s}  -14.89d {-14d 53' 15"}
SUN_DIST:         57.56 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       19.49d {+01h 17m 57s}  +13.38d {+13d 22' 46"}
MOON_DIST:        34.08 [deg]
MOON_ILLUM:      28 [%]
GAL_COORDS:      178.51,-79.05 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       12.30,-27.74 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Feb 11 21:22:53 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     445038,   Seg_Num: 0
POINT_RA:         22.496d {+01h 29m 59s} (J2000)
POINT_DEC:       -20.619d {-20d 37' 06"} (J2000)
POINT_ROLL:      265.122d
IMG_START_DATE:  15600 TJD;    39 DOY;   11/02/08
IMG_START_TIME:  76544.17 SOD {21:15:44.17} UT,   297.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.874
N_STARS:         29
X_OFFSET:        279 [pixels]
Y_OFFSET:        219 [pixels]
X_MAX:           1718 [pixels]
Y_MAX:           1658 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00445038000msufc0297.fits
SUN_POSTN:       322.18d {+21h 28m 42s}  -14.89d {-14d 53' 15"}
SUN_DIST:         57.56 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       19.49d {+01h 17m 58s}  +13.38d {+13d 22' 49"}
MOON_DIST:        34.08 [deg]
MOON_ILLUM:      28 [%]
GAL_COORDS:      178.51,-79.05 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       12.30,-27.74 [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:     Tue 08 Feb 11 21:23:39 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     445038,   Seg_Num: 0
GRB_RA:           22.4625d {+01h 29m 50.99s} (J2000),
                  22.5959d {+01h 30m 23.01s} (current),
                  21.8617d {+01h 27m 26.81s} (1950)
GRB_DEC:         -20.5927d {-20d 35' 33.7"} (J2000),
                 -20.5356d {-20d 32' 08.1"} (current),
                 -20.8505d {-20d 51' 01.9"} (1950)
GRB_ERROR:       2.4 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15600 TJD;    39 DOY;   11/02/08
IMG_START_TIME:  76343.00 SOD {21:12:23.00} UT,   96.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       322.18d {+21h 28m 43s}  -14.89d {-14d 53' 14"}
SUN_DIST:         57.53 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       19.50d {+01h 17m 59s}  +13.38d {+13d 22' 57"}
MOON_DIST:        34.05 [deg]
MOON_ILLUM:      28 [%]
GAL_COORDS:      178.31,-79.06 [deg] galactic lon,lat of the burst
ECL_COORDS:       12.28,-27.71 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Feb 11 21:24:04 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     445038,   Seg_Num: 0
POINT_RA:         22.496d {+01h 29m 59s} (J2000)
POINT_DEC:       -20.619d {-20d 37' 06"} (J2000)
ROLL:            265.122d
IMG_START_DATE:  15600 TJD;    39 DOY;   11/02/08
IMG_START_TIME:  76544.17 SOD {21:15:44.17} UT,   297.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     318892550
X_OFFSET:        838 [pixels]
Y_OFFSET:        778 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       998
Y_GRB_POS:       938
BINNING_INDEX:   1
IM_URL:          sw00445038000msuni0304.fits
SUN_POSTN:       322.18d {+21h 28m 43s}  -14.89d {-14d 53' 14"}
SUN_DIST:         57.56 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       19.50d {+01h 18m 00s}  +13.38d {+13d 23' 01"}
MOON_DIST:        34.08 [deg]
MOON_ILLUM:      28 [%]
GAL_COORDS:      178.51,-79.05 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       12.30,-27.74 [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:     Tue 08 Feb 11 21:24:20 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     445038,   Seg_Num: 0
POINT_RA:         22.496d {+01h 29m 59s} (J2000)
POINT_DEC:       -20.619d {-20d 37' 06"} (J2000)
ROLL:            265.122d
IMG_START_DATE:  15600 TJD;    39 DOY;   11/02/08
IMG_START_TIME:  76544.17 SOD {21:15:44.17} UT,   297.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     318892550
X_OFFSET:        838 [pixels]
Y_OFFSET:        778 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       998
Y_GRB_POS:       938
BINNING_INDEX:   1
IM_URL:          sw00445038000msuni0304.fits
SUN_POSTN:       322.18d {+21h 28m 43s}  -14.89d {-14d 53' 14"}
SUN_DIST:         57.56 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       19.50d {+01h 18m 01s}  +13.38d {+13d 23' 04"}
MOON_DIST:        34.08 [deg]
MOON_ILLUM:      28 [%]
GAL_COORDS:      178.51,-79.05 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       12.30,-27.74 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Feb 11 21:28:24 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     445038,   Seg_Num: 0
POINT_RA:         22.495d {+01h 29m 59s} (J2000)
POINT_DEC:       -20.619d {-20d 37' 07"} (J2000)
POINT_ROLL:      265.122d
IMG_START_DATE:  15600 TJD;    39 DOY;   11/02/08
IMG_START_TIME:  77121.23 SOD {21:25:21.23} UT,   874.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.303
N_STARS:         36
X_OFFSET:        279 [pixels]
Y_OFFSET:        219 [pixels]
X_MAX:           1718 [pixels]
Y_MAX:           1658 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00445038000msufc0874.fits
SUN_POSTN:       322.18d {+21h 28m 43s}  -14.89d {-14d 53' 11"}
SUN_DIST:         57.55 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       19.53d {+01h 18m 08s}  +13.40d {+13d 23' 45"}
MOON_DIST:        34.09 [deg]
MOON_ILLUM:      28 [%]
GAL_COORDS:      178.51,-79.05 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       12.30,-27.74 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Feb 11 21:28:45 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     445038,   Seg_Num: 0
POINT_RA:         22.495d {+01h 29m 59s} (J2000)
POINT_DEC:       -20.619d {-20d 37' 07"} (J2000)
POINT_ROLL:      265.122d
IMG_START_DATE:  15600 TJD;    39 DOY;   11/02/08
IMG_START_TIME:  77121.23 SOD {21:25:21.23} UT,   874.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.303
N_STARS:         36
X_OFFSET:        279 [pixels]
Y_OFFSET:        219 [pixels]
X_MAX:           1718 [pixels]
Y_MAX:           1658 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00445038000msufc0874.fits
SUN_POSTN:       322.18d {+21h 28m 43s}  -14.89d {-14d 53' 10"}
SUN_DIST:         57.55 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       19.54d {+01h 18m 09s}  +13.40d {+13d 23' 49"}
MOON_DIST:        34.09 [deg]
MOON_ILLUM:      28 [%]
GAL_COORDS:      178.51,-79.05 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       12.30,-27.74 [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:     Tue 08 Feb 11 21:30:00 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     445038,   Seg_Num: 0
POINT_RA:         22.495d {+01h 29m 59s} (J2000)
POINT_DEC:       -20.619d {-20d 37' 07"} (J2000)
ROLL:            265.122d
IMG_START_DATE:  15600 TJD;    39 DOY;   11/02/08
IMG_START_TIME:  77121.23 SOD {21:25:21.23} UT,   874.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     318893127
X_OFFSET:        838 [pixels]
Y_OFFSET:        778 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       998
Y_GRB_POS:       938
BINNING_INDEX:   1
IM_URL:          sw00445038000msuni0881.fits
SUN_POSTN:       322.18d {+21h 28m 44s}  -14.89d {-14d 53' 09"}
SUN_DIST:         57.55 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       19.55d {+01h 18m 11s}  +13.40d {+13d 24' 02"}
MOON_DIST:        34.10 [deg]
MOON_ILLUM:      28 [%]
GAL_COORDS:      178.51,-79.05 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       12.30,-27.74 [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:     Tue 08 Feb 11 21:30:12 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     445038,   Seg_Num: 0
POINT_RA:         22.495d {+01h 29m 59s} (J2000)
POINT_DEC:       -20.619d {-20d 37' 07"} (J2000)
ROLL:            265.122d
IMG_START_DATE:  15600 TJD;    39 DOY;   11/02/08
IMG_START_TIME:  77121.23 SOD {21:25:21.23} UT,   874.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     318893127
X_OFFSET:        838 [pixels]
Y_OFFSET:        778 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       998
Y_GRB_POS:       938
BINNING_INDEX:   1
IM_URL:          sw00445038000msuni0881.fits
SUN_POSTN:       322.18d {+21h 28m 44s}  -14.89d {-14d 53' 09"}
SUN_DIST:         57.55 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       19.55d {+01h 18m 12s}  +13.40d {+13d 24' 04"}
MOON_DIST:        34.10 [deg]
MOON_ILLUM:      28 [%]
GAL_COORDS:      178.51,-79.05 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       12.30,-27.74 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #11676
E. Berger, W. Fong (Harvard), and J. Mulchaey (OCIW) report:
"We observed the position of GRB 110208A (GCN #11674) with LDSS3 on the Magellan/Clay 6.5-m telescope on 2011 February 9.022 UT (3.35 hours after the burst) in the r- and i-band filters. In single 180 sec exposures in each filter no object is detected inside the XRT error circle (GCN #11674) to the limit of the Digitized Sky Survey."
GCN Circular #11677
T. Sakamoto (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), V. D'Elia (ASDC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from recent telemetry downlinks, we report further analysis of BAT GRB 110208A (trigger #445038) (D'Ella, et al., GCN Circ. 11674). The BAT ground-calculated position is RA, Dec = 22.487, -20.561 deg, which is
```
   RA(J2000)  =  01h 29m 56.9s 
   Dec(J2000) = -20d 33' 40.5" 
```
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted light curve shows a single peak starting at ~T-2 sec, peaking at ~T+0.5 sec, and ending at ~T+20 sec. T90 (15-350 keV) is 37.4 +- 7.9 sec (estimated error including systematics).
The time-averaged spectrum from T-1.5 to T+40.7 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.08 +- 0.31. The fluence in the 15-150 keV band is 2.7 +- 0.6 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.46 sec in the 15-150 keV band is 0.6 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/445038/BA/
GCN Circular #11678
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 5594 s of XRT Photon Counting mode data and 7 UVOT images for GRB 110208A, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 22.46218, -20.59277 which is equivalent to:
```
RA (J2000): 01h 29m 50.92s
Dec (J2000): -20d 35' 34.0"
```
with an uncertainty of 1.5 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #11679
V. D'Elia (ASDC) reports on behalf of the Swift-XRT team:
We have analysed 20 ks of XRT data for GRB 110208A (D'Elia et al. GCN Circ. 11674), from 64 s to 47.3 ks after the BAT trigger. The data comprise 55 s in Windowed Timing (WT) mode (the first 9 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN. Circ 11678).
The late-time light curve (from T0+4.3 ks) can be modelled with a power-law decay with a decay index of alpha=1.21 (+0.20, -0.18).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.27 (+/-0.25). The best-fitting absorption column is 1.1 (+0.4, -0.6) x 10^21 cm^-2, in excess of the Galactic value of 2.3 x 10^20 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.3 x 10^-11 (4.7 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.1 (+0.4, -0.6) x 10^21 cm^-2
Galactic foreground: 2.3 x 10^20 cm^-2
Excess significance: 3.2 sigma
Photon index:	     2.27 (+/-0.25)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00445038.
This circular is an official product of the Swift-XRT team.
GCN Circular #11681
E. Berger, W. Fong (Harvard), and J. Mulchaey (OCIW) report:
"We inspected our Magellan/LDSS3 r- and i-band images (GCN #11676) at the location of the refined XRT error circle (GCN #11678). We detect a single point source in coincidence with the new XRT position in both filters. The position of the optical source is (J2000):
```
RA = 01:29:50.86
DEC = -20:35:33.5
```
with an uncertainty of about 0.3" in each coordinate. The i-band magnitude is about 21.8 mag. At present we do not have any evidence for fading of this source."
GCN Circular #11683
M. De Pasquale (MSSL-UCL) and V. D'Elia (ASI-ASDC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 110208a 85s s after the BAT trigger (D'Elia, GCN Circ. 11674). No optical afterglow consistent with the enhanced XRT position (Evans et al, GCN Circ. 11678) or the Magellan position (Berger et al., GCN Circ. 11681) is detected in the initial UVOT exposures or in the summed ones. Preliminary 3-sigma upper limits using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for the first finding chart (FC) exposures and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)  Exp(s)   Mag

white_FC           85          240     147 	>20.6
white              85        18443    1425 	>21.5

u_FC               298         548     246 	>20.0
u                  298       30010    3111 >	21.2

v                  628       11030    1190 	>20.0
b                  553       24229    2021 	>21.4
w1                 703       29283    2919 	>21.3
m2                 652       28376    1771 	>21.1
w2                 603        6810     393 	>20.5
```
We note that there is a bright galaxy a few arcminutes from the GRB position.
The values quoted above are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.02 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #11685
W. Fong, E. Berger (Harvard), and J. Mulchaey (OCIW) report:
"We re-observed the position of GRB 110208A (GCN #11678) with LDSS3 on the Magellan/Clay 6.5-m telescope starting on 2011 February 10.03 UT (27.5 hrs post-burst). In a single 180-sec i-band exposure we no longer detect the point source described by Berger et al. (GCN #11681) to a limiting magnitude of i>22.8 mag (3-sigma). We therefore conclude that this source is the optical afterglow of GRB 110208A."
GCN Report 318.1
GCN_Report 318.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_318_1.pdf by V. D Elia at ASDC titled: "Swift Observations of GRB 110208A"

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Jochen Greiner, last update: 10-Feb-2011 [Disclaimer]