Gamma-ray Burst 090308

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 08 Mar 09 18:02:43 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     345777,   Seg_Num: 0
GRB_RA:          183.526d {+12h 14m 06s} (J2000),
                 183.647d {+12h 14m 35s} (current),
                 182.868d {+12h 11m 28s} (1950)
GRB_DEC:         -48.833d {-48d 49' 57"} (J2000),
                 -48.884d {-48d 53' 01"} (current),
                 -48.555d {-48d 33' 17"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=1951 [image_cnts]
TRIGGER_DUR:     64.000 [sec] 
TRIGGER_INDEX:   20000     E_range: 15-50 keV
BKG_INTEN:       0 [cnts]
BKG_TIME:        0.00 SOD {00:00:00.00} UT
BKG_DUR:         0 [sec]
GRB_DATE:        14898 TJD;    67 DOY;   09/03/08
GRB_TIME:        64883.44 SOD {18:01:23.44} UT
GRB_PHI:         133.58 [deg]
GRB_THETA:        15.05 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    8.92 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  -1  +0  +0 +57  +0 
SUN_POSTN:       349.24d {+23h 16m 58s}   -4.63d {-04d 37' 35"}
SUN_DIST:        125.03 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      139.50d {+09h 18m 00s}  +14.80d {+14d 47' 49"}
MOON_DIST:        74.70 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      296.63, 13.58 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      207.13,-42.42 [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 = 124.78,11.09 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:        GCN/SIMBAD_NED NOTICE
NOTICE_DATE:  Sun Mar  8 18:02:50 UTC 2009
NOTICE_TYPE:  Swift-BAT Position search
TRIGGER_NUM:  345777
RA:           183.5260 (J2000)
DEC:          -48.8329 (J2000)
 
SIMBAD search for BAT_RA,Dec=183.5260,-48.8329,radius=10.0arcmin
 
Num   RA         Dec                    Name                        Type  Num_Pub  Distance

 1 183.43333333 -48.84666667                  V* V652 Cen             sr*   0      3.75
 2 183.43333333 -48.84666667                  V* V652 Cen             sr*   0      3.75
 3 183.37695542 -48.79629889                   HD 106242               IR   0      6.28
 4 183.63731750 -48.75417722               TYC 8238-18-1               IR   0      6.46
 5 183.37245708 -48.78270889                  CD-48 7248               IR   0      6.77
 6 183.59457792 -48.72772611             TYC 8234-3000-1               IR   0      6.87
 7 183.72583333 -48.80805556                  CD-48 7266                *   0      8.03
 8 183.55271083 -48.96668028              TYC 8238-678-1               IR   0      8.10
 9 183.74875000 -48.81500000                  CD-48 7268                *   0      8.86
 
 
 
NED search for BAT_RA,Dec=183.5260,-48.8329,radius=10.0arcmin
 
Num    RA           Dec       Name                           Type      Distance

 1   183.544292   -48.835472  SUMSS J121410-485007          , RadioS   0.70
 2   183.561875   -48.787417  2MASX J12141487-4847149       , IrS      3.10
 3   183.633708   -48.732889  2MASX J12143206-4843584       , IrS      7.40
 4   183.440000   -48.705694  2MASX J12134556-4842208       , IrS      8.40

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 08 Mar 09 18:03:43 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     345777,   Seg_Num: 0
POINT_RA:        183.529d {+12h 14m 07s} (J2000)
POINT_DEC:       -48.843d {-48d 50' 35"} (J2000)
IMG_START_DATE:  14898 TJD;    67 DOY;   09/03/08
IMG_START_TIME:  65010.36 SOD {18:03:30.36} UT,   126.9 [sec] since BAT Trigger Time
COUNTS:          19    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:     Sun 08 Mar 09 18:05:41 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     345777,   Seg_Num: 0
GRB_RA:          183.526d {+12h 14m 06s} (J2000),
                 183.647d {+12h 14m 35s} (current),
                 182.868d {+12h 11m 28s} (1950)
GRB_DEC:         -48.833d {-48d 49' 57"} (J2000),
                 -48.884d {-48d 53' 01"} (current),
                 -48.555d {-48d 33' 17"} (1950)
GRB_DATE:        14898 TJD;    67 DOY;   09/03/08
GRB_TIME:        64883.44 SOD {18:01:23.44} UT
TRIGGER_INDEX:   20000
GRB_PHI:         133.58 [deg]
GRB_THETA:        15.05 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    8.92 [sigma]
LC_URL:          sw00345777000msb.lc
SUN_POSTN:       349.24d {+23h 16m 58s}   -4.63d {-04d 37' 32"}
SUN_DIST:        125.03 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      139.53d {+09h 18m 07s}  +14.79d {+14d 47' 08"}
MOON_DIST:        74.68 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      296.63, 13.58 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      207.13,-42.42 [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 = 124.78,11.09 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 08 Mar 09 18:06:47 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     345777,   Seg_Num: 0
POINT_RA:        183.529d {+12h 14m 07s} (J2000)
POINT_DEC:       -48.843d {-48d 50' 35"} (J2000)
POINT_ROLL:      162.501d
IMG_START_DATE:  14898 TJD;    67 DOY;   09/03/08
IMG_START_TIME:  65015.10 SOD {18:03:35.10} UT,   131.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.216
N_STARS:         190
X_OFFSET:        382 [pixels]
Y_OFFSET:        574 [pixels]
X_MAX:           1341 [pixels]
Y_MAX:           1533 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00345777000msufc0131.fits
SUN_POSTN:       349.24d {+23h 16m 58s}   -4.63d {-04d 37' 31"}
SUN_DIST:        125.02 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      139.54d {+09h 18m 09s}  +14.78d {+14d 46' 53"}
MOON_DIST:        74.68 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      296.63, 13.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      207.14,-42.43 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 08 Mar 09 18:07:22 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     345777,   Seg_Num: 0
POINT_RA:        183.529d {+12h 14m 07s} (J2000)
POINT_DEC:       -48.843d {-48d 50' 35"} (J2000)
POINT_ROLL:      162.501d
IMG_START_DATE:  14898 TJD;    67 DOY;   09/03/08
IMG_START_TIME:  65015.10 SOD {18:03:35.10} UT,   131.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.216
N_STARS:         190
X_OFFSET:        382 [pixels]
Y_OFFSET:        574 [pixels]
X_MAX:           1341 [pixels]
Y_MAX:           1533 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00345777000msufc0131.fits
SUN_POSTN:       349.24d {+23h 16m 58s}   -4.63d {-04d 37' 31"}
SUN_DIST:        125.03 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      139.54d {+09h 18m 11s}  +14.78d {+14d 46' 45"}
MOON_DIST:        74.68 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      296.63, 13.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      207.14,-42.43 [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:     Sun 08 Mar 09 18:07:31 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     345777,   Seg_Num: 0
POINT_RA:        183.529d {+12h 14m 07s} (J2000)
POINT_DEC:       -48.843d {-48d 50' 35"} (J2000)
ROLL:            162.501d
IMG_START_DATE:  14898 TJD;    67 DOY;   09/03/08
IMG_START_TIME:  65015.10 SOD {18:03:35.10} UT,   131.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     258228219
X_OFFSET:        701 [pixels]
Y_OFFSET:        893 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       861
Y_GRB_POS:       1053
BINNING_INDEX:   1
IM_URL:          sw00345777000msuni0136.fits
SUN_POSTN:       349.24d {+23h 16m 58s}   -4.63d {-04d 37' 31"}
SUN_DIST:        125.03 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      139.55d {+09h 18m 11s}  +14.78d {+14d 46' 42"}
MOON_DIST:        74.68 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      296.63, 13.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      207.14,-42.43 [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/SIMBAD_NED NOTICE
NOTICE_DATE:  Sun Mar  8 18:09:10 UTC 2009
NOTICE_TYPE:  Swift-XRT Position search
TRIGGER_NUM:  345777
RA:           183.5005 (J2000)
DEC:          -48.8163 (J2000)
 
SIMBAD search for XRT_RA,Dec=183.5005,-48.8163,radius=1.0arcmin
 
Num   RA         Dec                    Name                        Type  Num_Pub  Distance

 
 
 
NED search for XRT_RA,Dec=183.5005,-48.8163,radius=1.0arcmin
 
Num    RA           Dec       Name                           Type      Distance

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 08 Mar 09 18:07:57 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     345777,   Seg_Num: 0
POINT_RA:        183.529d {+12h 14m 07s} (J2000)
POINT_DEC:       -48.843d {-48d 50' 35"} (J2000)
ROLL:            162.501d
IMG_START_DATE:  14898 TJD;    67 DOY;   09/03/08
IMG_START_TIME:  65015.10 SOD {18:03:35.10} UT,   131.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     258228219
X_OFFSET:        701 [pixels]
Y_OFFSET:        893 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       861
Y_GRB_POS:       1053
BINNING_INDEX:   1
IM_URL:          sw00345777000msuni0136.fits
SUN_POSTN:       349.24d {+23h 16m 58s}   -4.63d {-04d 37' 30"}
SUN_DIST:        125.03 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      139.55d {+09h 18m 12s}  +14.78d {+14d 46' 36"}
MOON_DIST:        74.67 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      296.63, 13.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      207.14,-42.43 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_sources_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 08 Mar 09 18:09:08 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     345777,   Seg_Num: 0
GRB_RA:          183.5005d {+12h 14m 00.11s} (J2000),
                 183.6218d {+12h 14m 29.23s} (current),
                 182.8425d {+12h 11m 22.19s} (1950)
GRB_DEC:         -48.8163d {-48d 48' 58.6"} (J2000),
                 -48.8673d {-48d 52' 02.3"} (current),
                 -48.5383d {-48d 32' 17.9"} (1950)
GRB_ERROR:       3.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  14898 TJD;    67 DOY;   09/03/08
IMG_START_TIME:  65065.00 SOD {18:04:25.00} UT,   181.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       349.24d {+23h 16m 59s}   -4.62d {-04d 37' 29"}
SUN_DIST:        125.06 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      139.56d {+09h 18m 15s}  +14.77d {+14d 46' 20"}
MOON_DIST:        74.63 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      296.61, 13.60 [deg] galactic lon,lat of the burst
ECL_COORDS:      207.09,-42.42 [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.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 08 Mar 09 18:06:47 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     345777,   Seg_Num: 0
POINT_RA:        183.529d {+12h 14m 07s} (J2000)
POINT_DEC:       -48.843d {-48d 50' 35"} (J2000)
POINT_ROLL:      162.501d
IMG_START_DATE:  14898 TJD;    67 DOY;   09/03/08
IMG_START_TIME:  65015.10 SOD {18:03:35.10} UT,   131.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.216
N_STARS:         190
X_OFFSET:        382 [pixels]
Y_OFFSET:        574 [pixels]
X_MAX:           1341 [pixels]
Y_MAX:           1533 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00345777000msufc0131.fits
SUN_POSTN:       349.24d {+23h 16m 58s}   -4.63d {-04d 37' 31"}
SUN_DIST:        125.02 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      139.54d {+09h 18m 09s}  +14.78d {+14d 46' 53"}
MOON_DIST:        74.68 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      296.63, 13.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      207.14,-42.43 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 08 Mar 09 18:14:16 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     345777,   Seg_Num: 0
POINT_RA:        183.526d {+12h 14m 06s} (J2000)
POINT_DEC:       -48.846d {-48d 50' 45"} (J2000)
POINT_ROLL:      162.503d
IMG_START_DATE:  14898 TJD;    67 DOY;   09/03/08
IMG_START_TIME:  65172.95 SOD {18:06:12.95} UT,   289.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.643
N_STARS:         190
X_OFFSET:        142 [pixels]
Y_OFFSET:        334 [pixels]
X_MAX:           1581 [pixels]
Y_MAX:           1773 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00345777000msufc0289.fits
SUN_POSTN:       349.25d {+23h 16m 59s}   -4.62d {-04d 37' 24"}
SUN_DIST:        125.03 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      139.61d {+09h 18m 26s}  +14.75d {+14d 45' 09"}
MOON_DIST:        74.62 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      296.63, 13.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      207.14,-42.43 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 08 Mar 09 18:14:16 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     345777,   Seg_Num: 0
POINT_RA:        183.526d {+12h 14m 06s} (J2000)
POINT_DEC:       -48.846d {-48d 50' 45"} (J2000)
POINT_ROLL:      162.503d
IMG_START_DATE:  14898 TJD;    67 DOY;   09/03/08
IMG_START_TIME:  65172.95 SOD {18:06:12.95} UT,   289.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.643
N_STARS:         190
X_OFFSET:        142 [pixels]
Y_OFFSET:        334 [pixels]
X_MAX:           1581 [pixels]
Y_MAX:           1773 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00345777000msufc0289.fits
SUN_POSTN:       349.25d {+23h 16m 59s}   -4.62d {-04d 37' 24"}
SUN_DIST:        125.03 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      139.61d {+09h 18m 26s}  +14.75d {+14d 45' 09"}
MOON_DIST:        74.62 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      296.63, 13.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      207.14,-42.43 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 08 Mar 09 18:14:55 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     345777,   Seg_Num: 0
POINT_RA:        183.526d {+12h 14m 06s} (J2000)
POINT_DEC:       -48.846d {-48d 50' 45"} (J2000)
POINT_ROLL:      162.503d
IMG_START_DATE:  14898 TJD;    67 DOY;   09/03/08
IMG_START_TIME:  65172.95 SOD {18:06:12.95} UT,   289.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.643
N_STARS:         190
X_OFFSET:        142 [pixels]
Y_OFFSET:        334 [pixels]
X_MAX:           1581 [pixels]
Y_MAX:           1773 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00345777000msufc0289.fits
SUN_POSTN:       349.25d {+23h 16m 59s}   -4.62d {-04d 37' 23"}
SUN_DIST:        125.03 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      139.62d {+09h 18m 28s}  +14.75d {+14d 44' 60"}
MOON_DIST:        74.62 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      296.63, 13.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      207.14,-42.43 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:        GCN/SIMBAD_NED NOTICE
NOTICE_DATE:  Sun Mar  8 18:14:59 UTC 2009
NOTICE_TYPE:  Swift-XRT Position search
TRIGGER_NUM:  345777
RA:           183.5016 (J2000)
DEC:          -48.8168 (J2000)
 
SIMBAD search for XRT_RA,Dec=183.5016,-48.8168,radius=1.0arcmin
 
Num   RA         Dec                    Name                        Type  Num_Pub  Distance

 
 
 
NED search for XRT_RA,Dec=183.5016,-48.8168,radius=1.0arcmin
 
Num    RA           Dec       Name                           Type      Distance

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 08 Mar 09 18:14:57 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     345777,   Seg_Num: 0
GRB_RA:          183.5016d {+12h 14m 00.38s} (J2000),
                 183.6229d {+12h 14m 29.49s} (current),
                 182.8436d {+12h 11m 22.45s} (1950)
GRB_DEC:         -48.8168d {-48d 49' 00.4"} (J2000),
                 -48.8678d {-48d 52' 04.1"} (current),
                 -48.5388d {-48d 32' 19.7"} (1950)
GRB_ERROR:       2.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  14898 TJD;    67 DOY;   09/03/08
IMG_START_TIME:  65065.00 SOD {18:04:25.00} UT,   181.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       349.25d {+23h 16m 59s}   -4.62d {-04d 37' 23"}
SUN_DIST:        125.06 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      139.62d {+09h 18m 28s}  +14.75d {+14d 44' 59"}
MOON_DIST:        74.59 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      296.61, 13.59 [deg] galactic lon,lat of the burst
ECL_COORDS:      207.10,-42.42 [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

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 08 Mar 09 18:15:41 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     345777,   Seg_Num: 0
POINT_RA:        183.526d {+12h 14m 06s} (J2000)
POINT_DEC:       -48.846d {-48d 50' 45"} (J2000)
ROLL:            162.503d
IMG_START_DATE:  14898 TJD;    67 DOY;   09/03/08
IMG_START_TIME:  65172.95 SOD {18:06:12.95} UT,   289.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     258228377
X_OFFSET:        701 [pixels]
Y_OFFSET:        893 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       861
Y_GRB_POS:       1053
BINNING_INDEX:   1
IM_URL:          sw00345777000msuni0294.fits
SUN_POSTN:       349.25d {+23h 17m 00s}   -4.62d {-04d 37' 23"}
SUN_DIST:        125.03 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      139.62d {+09h 18m 30s}  +14.75d {+14d 44' 49"}
MOON_DIST:        74.61 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      296.63, 13.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      207.14,-42.43 [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:     Sun 08 Mar 09 18:16:08 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     345777,   Seg_Num: 0
POINT_RA:        183.526d {+12h 14m 06s} (J2000)
POINT_DEC:       -48.846d {-48d 50' 45"} (J2000)
ROLL:            162.503d
IMG_START_DATE:  14898 TJD;    67 DOY;   09/03/08
IMG_START_TIME:  65172.95 SOD {18:06:12.95} UT,   289.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     258228377
X_OFFSET:        701 [pixels]
Y_OFFSET:        893 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       861
Y_GRB_POS:       1053
BINNING_INDEX:   1
IM_URL:          sw00345777000msuni0294.fits
SUN_POSTN:       349.25d {+23h 17m 00s}   -4.62d {-04d 37' 22"}
SUN_DIST:        125.03 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      139.63d {+09h 18m 31s}  +14.75d {+14d 44' 43"}
MOON_DIST:        74.61 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      296.63, 13.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      207.14,-42.43 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_sources_image.fits.gz file does not exist; skipping the attachment.

GCN Circular #8948
P. A. Evans (U Leicester), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), D. N. Burrows (PSU), N. Gehrels (NASA/GSFC), S. T. Holland (CRESST/USRA/GSFC), R. Margutti (Univ Bicocca&OAB), C. B. Markwardt (CRESST/GSFC/UMD), F. E. Marshall (NASA/GSFC), P. T. O'Brien (U Leicester), C. Pagani (PSU), K. L. Page (U Leicester), A. M. Parsons (GSFC), P. Romano (INAF-IASFPA), B. Sbarufatti (INAF-IASFPA), R. L. C. Starling (U Leicester), M. C. Stroh (PSU), T. N. Ukwatta (GSFC/GWU) and L. Vetere (PSU) report on behalf of the Swift Team:
At 18:01:23 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 090308 (trigger=345777). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 183.526, -48.833 which is
```
   RA(J2000) = 12h 14m 06s
   Dec(J2000) = -48d 49' 57"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). This is an image trigger, but even so the BAT light curve shows a weak peak at T+20 to T+35 sec. The peak count rate was ~350 counts/sec (15-350 keV), at ~25 sec after the trigger.
The XRT began observing the field at 18:03:30.4 UT, 126.9 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 183.5017, -48.8169 which is equivalent to:
```
   RA(J2000)  = 12h 14m 0.41s
   Dec(J2000) = -48d 49' 00.9"
```
with an uncertainty of 2.2 arcseconds (radius, 90% containment). This location is 81 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (8.54e+20 cm^-2, Kalberla et al. 2005), with an excess column of 1.8 (+1.51/-1.36) x 10^21 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 131 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. Because part of the 2.7'x2.7' sub-image was not received, there is no overlap with the XRT error circle. The 8'x8' region for the list of sources generated on-board covers the entire XRT error circle. No correction has been made for the expected extinction corresponding to E(B-V) of 0.11.
Burst Advocate for this burst is P. A. Evans (pae9 AT star.le.ac.uk). 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 Circular #8949
C. B. Markwardt (GSFC/UMD), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), P. A. Evans (U Leicester), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), D. M. Palmer (LANL), A. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-60 to T+243 sec from recent telemetry downlinks, we report further analysis of BAT GRB 090308 (trigger #345777) (Evans, et al., GCN Circ. 8948). The BAT ground-calculated position is RA, Dec = 183.545, -48.754 deg, which is
```
   RA(J2000)  =  12h 14m 10.7s 
   Dec(J2000) = -48d 45' 13.8" 
```
with an uncertainty of 3.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 89%.
The mask-weighted light curve shows a single peak starting at ~T-10 sec, peaking at ~T+30 sec, and ending at ~T+65 sec. T90 (15-350 keV) is 48 +- 22 sec (estimated error including systematics).
The time-averaged spectrum from T+4.0 to T+52.0 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.33 +- 0.37. The fluence in the 15-150 keV band is 2.6 +- 0.6 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+27.50 sec in the 15-150 keV band is 0.1 +- 0.0 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/345777/BA/
GCN Circular #8956
P. A. Evans and K.L. Page (U Leicester) report on behalf of the Swift-XRT team:
We have analysed 4.4 ks of XRT data for GRB 090308 (Evans et al. GCN Circ. 8948), from 130 s to 12.2 ks after the BAT trigger. The data comprise 55 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. Using 460 s of PC mode data and 1 UVOT image, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 183.50120, -48.81710 which is equivalent to:
```
RA (J2000): 12 14 0.28
Dec(J2000): -48 49 01.6
```
with an uncertainty of 1.6 arcsec (radius, 90% confidence).
The light curve can be modelled with an initial power-law decay with an index of alpha=2.63 (+0.16, -0.13), followed by a break at T+830 s to an alpha of 1.2 (+0.5, -1.9).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.93 (+0.28, -0.26). The best-fitting absorption column is 2.86 (+1.01, -0.88) x 10^21, in excess of the Galactic value of 8.5 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 4.5 x 10^-11 (6.8 x 10-11) erg cm^-2 count^-1.
If the light curve continues to decay with a power-law decay index of 1.9, the count rate at T+24 hours will be 2.0 x 10^-4 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 9.1 x 10^-15 (1.4 x 10^-14) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00345777.
This circular is an official product of the Swift-XRT team.
GCN Circular #8962
F.E. Marshall (NASA/GSFC) and P. Evans (U. Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT observed the field of GRB 0900308 starting 132 s after the BAT trigger (Evans et al., GCN Circ. 8948). No optical afterglow is detected in the initial UVOT exposures at the position of the X-ray afterglow (Evans and Page, GCN Circ. 8956). Three-sigma upper limits using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for the first finding chart (FC) exposure and subsequent exposures are:
```
Filter          T_start(s)   T_stop(s)      Exp(s)       Mag 

white (FC)         132          282          147         >21.1
white              570        11390         1102         >22.2
v                  620        17423         1101         >20.6
b                  545         6455          382         >20.8
u                  290         6281          639         >20.7
uvw1               669         6077          399         >20.6
uvm2               644        18019          798         >20.8
uvw2               595        12237         1044         >21.2
```
The values quoted above are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.11 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #8965
S. B. Cenko, A. N. Morgan, D. A. Perley, N. R. Butler, and J. S. Bloom (UC Berkeley) report on behalf of a larger collaboration:
We have imaged the field of GRB090308 (Evans et al.; GCN 8948) with GMOS mounted on the Gemini South telescope beginning at approximately 1:38 UT on the night of 9 March 2009 (~ 7.6 hours after the burst). Images were taken in the g', r', i', and z' filters for a total of 300 s in each band.
We find no significant sources inside the revised XRT error circle (Evans et al.; GCN 8956) to the following limits: g' > 23.8; r' > 24.2; i' > 23.6; z' > 22.5. These limits were calculated using reference stars from the USNO-B1 catalog and applying the filter transformations of Jordi, Grebel, and Ammon (A&A 460, 2009).
We do, however, note the presence of an extremely red point source located several arcseconds southwest of the refined XRT position, and immediately outside the X-ray position provided by Butler (AJ 133, 2007; see http://astro.berkeley.edu/~nat/swift/xrt_pos.html). The coordinates of this source are (J2000.0):
```
	RA: 12:13:59.89
	Dec: -48:49:03.5
```
This object is detected only in the r', i', and z' filters with approximate magnitudes: r' = 23.6; i' = 21.6; z' = 20.2 (uncorrected for Galactic extinction). While we consider the association unlikely, further observations are required to determine if this is the afterglow of GRB090308.
We wish to thank the staff at Gemini Observatory for undertaking these observations.
GCN Circular #8966
A. C. Updike (Clemson University), C. Clemens, J. Greiner and P. Afonso (MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 090308 (Swift trigger 345777; Evans et al., GCN #8948) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m ESO/MPI telescope at La Silla Observatory (Chile).
Observations started at 00:01 UT on March 9th, 6 hours after the GRB trigger for 2 hours, and were followed by a second epoch beginning at 07:44 UT and lasting 30 min. They were carried out at an average seeing of 1.7".
The red object just outside the enhanced XRT error circle noted by Cenko et al. (GCN #8965) is detected in both epochs with no sign of fading. Therefore, we conclude this is not the afterglow of GRB 090308.
Based on 30 min of our first epoch, we do not detect a source within the Swift-XRT error circle reported by Evans & Page (GCN #8956) down to (all in AB system)
```
 g' > 22.7,
 r' > 22.9,
 i' > 22.6,
 z' > 22.3,
 J > 21.1,
 H > 20.6 and
 K > 19.6
```
The given limits are derived based on calibrating the images against GROND zeropoints and 2MASS field stars and are not corrected for the Galactic foreground extinction corresponding to a reddening of E_(B-V)= 0.114 in the direction of the burst (Schlegel et al. 1998).
GCN Report 202.1
GCN_Report 202.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_202_1.pdf by P.A. Evans at U.Leicester titled: "Final Swift Observations of GRB 090308"

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Jochen Greiner, last update: 24-Mar-2009 [Disclaimer]