Gamma-ray Burst 100302A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 02 Mar 10 19:54:34 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     414592,   Seg_Num: 0
GRB_RA:          195.344d {+13h 01m 23s} (J2000),
                 195.420d {+13h 01m 41s} (current),
                 194.970d {+12h 59m 53s} (1950)
GRB_DEC:         +74.581d {+74d 34' 51"} (J2000),
                 +74.526d {+74d 31' 34"} (current),
                 +74.850d {+74d 50' 58"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=1502 [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:        15257 TJD;    61 DOY;   10/03/02
GRB_TIME:        71586.42 SOD {19:53:06.42} UT
GRB_PHI:         -43.02 [deg]
GRB_THETA:        13.83 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    7.73 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  -2  +0  +0 +34  +0 
SUN_POSTN:       343.52d {+22h 54m 04s}   -7.01d {-07d 00' 44"}
SUN_DIST:        110.03 [deg]   Sun_angle= 9.9 [hr] (West of Sun)
MOON_POSTN:      189.04d {+12h 36m 09s}   -9.37d {-09d 22' 22"}
MOON_DIST:        83.99 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      122.04, 42.53 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      128.80, 65.85 [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 = 119.60,-1.81 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 02 Mar 10 19:55:42 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     414592,   Seg_Num: 0
GRB_RA:          195.5119d {+13h 02m 02.85s} (J2000),
                 195.5872d {+13h 02m 20.93s} (current),
                 195.1408d {+13h 00m 33.78s} (1950)
GRB_DEC:         +74.5869d {+74d 35' 12.8"} (J2000),
                 +74.5324d {+74d 31' 56.5"} (current),
                 +74.8554d {+74d 51' 19.4"} (1950)
GRB_ERROR:       5.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.96e-09 [erg/cm2/sec]
GRB_SIGNIF:      9.05 [sigma]
IMG_START_DATE:  15257 TJD;    61 DOY;   10/03/02
IMG_START_TIME:  71711.87 SOD {19:55:11.87} UT,   125.4 [sec] since BAT Trigger Time
TAM[0-3]:        327.64 237.25 261.47 243.36
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       343.52d {+22h 54m 04s}   -7.01d {-07d 00' 43"}
SUN_DIST:        110.00 [deg]   Sun_angle= 9.9 [hr] (West of Sun)
MOON_POSTN:      189.05d {+12h 36m 12s}   -9.38d {-09d 22' 39"}
MOON_DIST:        84.01 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      121.98, 42.52 [deg] galactic lon,lat of the burst
ECL_COORDS:      128.82, 65.89 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 2.69 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 02 Mar 10 19:55:52 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     414592,   Seg_Num: 0
GRB_RA:          195.5119d {+13h 02m 02.8s} (J2000),
                 195.5872d {+13h 02m 20.9s} (current),
                 195.1408d {+13h 00m 33.7s} (1950)
GRB_DEC:         +74.5869d {+74d 35' 12.8"} (J2000),
                 +74.5324d {+74d 31' 56.5"} (current),
                 +74.8554d {+74d 51' 19.4"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       82 [cnts]
IMG_START_DATE:  15257 TJD;    61 DOY;   10/03/02
IMG_START_TIME:  71711.87 SOD {19:55:11.87} UT,   125.4 [sec] since BAT Trigger Time
CENTROID_X:      228.77,  raw= 229  [pixels]
CENTROID_Y:      256.69,  raw= 257  [pixels]
ROLL:            33.84 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -97.36
GRB_POS_XRT_Z:   -173.31
IMAGE_URL:       sw00414592000msxps_rw.img
SUN_POSTN:       343.52d {+22h 54m 04s}   -7.01d {-07d 00' 43"}
SUN_DIST:        110.00 [deg]   Sun_angle= 9.9 [hr] (West of Sun)
MOON_POSTN:      189.05d {+12h 36m 12s}   -9.38d {-09d 22' 41"}
MOON_DIST:        84.01 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      121.98, 42.52 [deg] galactic lon,lat of the burst
ECL_COORDS:      128.82, 65.89 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 02 Mar 10 19:56:00 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     414592,   Seg_Num: 0
GRB_RA:          195.5119d {+13h 02m 02.8s} (J2000),
                 195.5872d {+13h 02m 20.9s} (current),
                 195.1408d {+13h 00m 33.7s} (1950)
GRB_DEC:         +74.5869d {+74d 35' 12.8"} (J2000),
                 +74.5324d {+74d 31' 56.5"} (current),
                 +74.8554d {+74d 51' 19.4"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       82 [cnts]
IMG_START_DATE:  15257 TJD;    61 DOY;   10/03/02
IMG_START_TIME:  71711.87 SOD {19:55:11.87} UT,   125.4 [sec] since BAT Trigger Time
CENTROID_X:      228.77,  raw= 229  [pixels]
CENTROID_Y:      256.69,  raw= 257  [pixels]
ROLL:            33.84 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -97.36
GRB_POS_XRT_Z:   -173.31
IMAGE_URL:       sw00414592000msxps_rw.img
SUN_POSTN:       343.52d {+22h 54m 04s}   -7.01d {-07d 00' 43"}
SUN_DIST:        110.00 [deg]   Sun_angle= 9.9 [hr] (West of Sun)
MOON_POSTN:      189.05d {+12h 36m 12s}   -9.38d {-09d 22' 43"}
MOON_DIST:        84.01 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      121.98, 42.52 [deg] galactic lon,lat of the burst
ECL_COORDS:      128.82, 65.89 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 02 Mar 10 19:57:17 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     414592,   Seg_Num: 0
GRB_RA:          195.344d {+13h 01m 23s} (J2000),
                 195.420d {+13h 01m 41s} (current),
                 194.970d {+12h 59m 53s} (1950)
GRB_DEC:         +74.581d {+74d 34' 51"} (J2000),
                 +74.526d {+74d 31' 34"} (current),
                 +74.850d {+74d 50' 58"} (1950)
GRB_DATE:        15257 TJD;    61 DOY;   10/03/02
GRB_TIME:        71586.42 SOD {19:53:06.42} UT
TRIGGER_INDEX:   20000
GRB_PHI:         -43.02 [deg]
GRB_THETA:        13.83 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    7.73 [sigma]
LC_URL:          sw00414592000msb.lc
SUN_POSTN:       343.52d {+22h 54m 04s}   -7.01d {-07d 00' 41"}
SUN_DIST:        110.03 [deg]   Sun_angle= 9.9 [hr] (West of Sun)
MOON_POSTN:      189.06d {+12h 36m 15s}   -9.38d {-09d 23' 02"}
MOON_DIST:        84.00 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      122.04, 42.53 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      128.80, 65.85 [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 = 119.60,-1.81 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 02 Mar 10 19:58:10 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     414592,   Seg_Num: 0
POINT_RA:        195.328d {+13h 01m 19s} (J2000)
POINT_DEC:       +74.562d {+74d 33' 43"} (J2000)
POINT_ROLL:      33.839d
IMG_START_DATE:  15257 TJD;    61 DOY;   10/03/02
IMG_START_TIME:  71719.14 SOD {19:55:19.14} UT,   132.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.552
N_STARS:         38
X_OFFSET:        584 [pixels]
Y_OFFSET:        456 [pixels]
X_MAX:           1543 [pixels]
Y_MAX:           1415 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00414592000msufc0132.fits
SUN_POSTN:       343.52d {+22h 54m 04s}   -7.01d {-07d 00' 40"}
SUN_DIST:        110.04 [deg]   Sun_angle= 9.9 [hr] (West of Sun)
MOON_POSTN:      189.07d {+12h 36m 17s}   -9.39d {-09d 23' 15"}
MOON_DIST:        83.99 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      122.04, 42.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.84, 65.83 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 02 Mar 10 19:58:37 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     414592,   Seg_Num: 0
POINT_RA:        195.328d {+13h 01m 19s} (J2000)
POINT_DEC:       +74.562d {+74d 33' 43"} (J2000)
POINT_ROLL:      33.839d
IMG_START_DATE:  15257 TJD;    61 DOY;   10/03/02
IMG_START_TIME:  71719.14 SOD {19:55:19.14} UT,   132.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.552
N_STARS:         38
X_OFFSET:        584 [pixels]
Y_OFFSET:        456 [pixels]
X_MAX:           1543 [pixels]
Y_MAX:           1415 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00414592000msufc0132.fits
SUN_POSTN:       343.52d {+22h 54m 04s}   -7.01d {-07d 00' 40"}
SUN_DIST:        110.04 [deg]   Sun_angle= 9.9 [hr] (West of Sun)
MOON_POSTN:      189.08d {+12h 36m 18s}   -9.39d {-09d 23' 22"}
MOON_DIST:        83.99 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      122.04, 42.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.84, 65.83 [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 02 Mar 10 19:58:10 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     414592,   Seg_Num: 0
POINT_RA:        195.328d {+13h 01m 19s} (J2000)
POINT_DEC:       +74.562d {+74d 33' 43"} (J2000)
POINT_ROLL:      33.839d
IMG_START_DATE:  15257 TJD;    61 DOY;   10/03/02
IMG_START_TIME:  71719.14 SOD {19:55:19.14} UT,   132.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.552
N_STARS:         38
X_OFFSET:        584 [pixels]
Y_OFFSET:        456 [pixels]
X_MAX:           1543 [pixels]
Y_MAX:           1415 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00414592000msufc0132.fits
SUN_POSTN:       343.52d {+22h 54m 04s}   -7.01d {-07d 00' 40"}
SUN_DIST:        110.04 [deg]   Sun_angle= 9.9 [hr] (West of Sun)
MOON_POSTN:      189.07d {+12h 36m 17s}   -9.39d {-09d 23' 15"}
MOON_DIST:        83.99 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      122.04, 42.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.84, 65.83 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 02 Mar 10 19:59:43 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     414592,   Seg_Num: 0
POINT_RA:        195.328d {+13h 01m 19s} (J2000)
POINT_DEC:       +74.562d {+74d 33' 43"} (J2000)
ROLL:            33.839d
IMG_START_DATE:  15257 TJD;    61 DOY;   10/03/02
IMG_START_TIME:  71719.14 SOD {19:55:19.14} UT,   132.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     289252524
X_OFFSET:        1205 [pixels]
Y_OFFSET:        882 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1365
Y_GRB_POS:       1042
BINNING_INDEX:   1
IM_URL:          sw00414592000msuni0138.fits
SUN_POSTN:       343.52d {+22h 54m 04s}   -7.01d {-07d 00' 39"}
SUN_DIST:        110.04 [deg]   Sun_angle= 9.9 [hr] (West of Sun)
MOON_POSTN:      189.09d {+12h 36m 21s}   -9.39d {-09d 23' 38"}
MOON_DIST:        83.99 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      122.04, 42.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.84, 65.83 [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:     Tue 02 Mar 10 19:59:56 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     414592,   Seg_Num: 0
POINT_RA:        195.328d {+13h 01m 19s} (J2000)
POINT_DEC:       +74.562d {+74d 33' 43"} (J2000)
ROLL:            33.839d
IMG_START_DATE:  15257 TJD;    61 DOY;   10/03/02
IMG_START_TIME:  71719.14 SOD {19:55:19.14} UT,   132.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     289252524
X_OFFSET:        1205 [pixels]
Y_OFFSET:        882 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1365
Y_GRB_POS:       1042
BINNING_INDEX:   1
IM_URL:          sw00414592000msuni0138.fits
SUN_POSTN:       343.52d {+22h 54m 04s}   -7.01d {-07d 00' 39"}
SUN_DIST:        110.04 [deg]   Sun_angle= 9.9 [hr] (West of Sun)
MOON_POSTN:      189.09d {+12h 36m 21s}   -9.40d {-09d 23' 41"}
MOON_DIST:        83.99 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      122.04, 42.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.84, 65.83 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 02 Mar 10 20:04:44 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     414592,   Seg_Num: 0
POINT_RA:        195.322d {+13h 01m 17s} (J2000)
POINT_DEC:       +74.562d {+74d 33' 43"} (J2000)
POINT_ROLL:      33.831d
IMG_START_DATE:  15257 TJD;    61 DOY;   10/03/02
IMG_START_TIME:  71877.11 SOD {19:57:57.11} UT,   290.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.394
N_STARS:         18
X_OFFSET:        885 [pixels]
Y_OFFSET:        562 [pixels]
X_MAX:           1844 [pixels]
Y_MAX:           1521 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00414592000msufc0290.fits
SUN_POSTN:       343.52d {+22h 54m 05s}   -7.01d {-07d 00' 34"}
SUN_DIST:        110.04 [deg]   Sun_angle= 9.9 [hr] (West of Sun)
MOON_POSTN:      189.13d {+12h 36m 32s}   -9.41d {-09d 24' 52"}
MOON_DIST:        84.01 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      122.04, 42.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.84, 65.83 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 02 Mar 10 20:04:44 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     414592,   Seg_Num: 0
POINT_RA:        195.322d {+13h 01m 17s} (J2000)
POINT_DEC:       +74.562d {+74d 33' 43"} (J2000)
POINT_ROLL:      33.831d
IMG_START_DATE:  15257 TJD;    61 DOY;   10/03/02
IMG_START_TIME:  71877.11 SOD {19:57:57.11} UT,   290.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.394
N_STARS:         18
X_OFFSET:        885 [pixels]
Y_OFFSET:        562 [pixels]
X_MAX:           1844 [pixels]
Y_MAX:           1521 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00414592000msufc0290.fits
SUN_POSTN:       343.52d {+22h 54m 05s}   -7.01d {-07d 00' 34"}
SUN_DIST:        110.04 [deg]   Sun_angle= 9.9 [hr] (West of Sun)
MOON_POSTN:      189.13d {+12h 36m 32s}   -9.41d {-09d 24' 52"}
MOON_DIST:        84.01 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      122.04, 42.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.84, 65.83 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 02 Mar 10 20:05:16 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     414592,   Seg_Num: 0
POINT_RA:        195.322d {+13h 01m 17s} (J2000)
POINT_DEC:       +74.562d {+74d 33' 43"} (J2000)
POINT_ROLL:      33.831d
IMG_START_DATE:  15257 TJD;    61 DOY;   10/03/02
IMG_START_TIME:  71877.11 SOD {19:57:57.11} UT,   290.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.394
N_STARS:         18
X_OFFSET:        885 [pixels]
Y_OFFSET:        562 [pixels]
X_MAX:           1844 [pixels]
Y_MAX:           1521 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00414592000msufc0290.fits
SUN_POSTN:       343.52d {+22h 54m 05s}   -7.01d {-07d 00' 34"}
SUN_DIST:        110.04 [deg]   Sun_angle= 9.9 [hr] (West of Sun)
MOON_POSTN:      189.14d {+12h 36m 33s}   -9.42d {-09d 25' 00"}
MOON_DIST:        84.01 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      122.04, 42.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.84, 65.83 [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 02 Mar 10 20:05:51 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     414592,   Seg_Num: 0
POINT_RA:        195.322d {+13h 01m 17s} (J2000)
POINT_DEC:       +74.562d {+74d 33' 43"} (J2000)
ROLL:            33.831d
IMG_START_DATE:  15257 TJD;    61 DOY;   10/03/02
IMG_START_TIME:  71877.11 SOD {19:57:57.11} UT,   290.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     289252682
X_OFFSET:        1205 [pixels]
Y_OFFSET:        882 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1365
Y_GRB_POS:       1042
BINNING_INDEX:   1
IM_URL:          sw00414592000msuni0296.fits
SUN_POSTN:       343.52d {+22h 54m 05s}   -7.01d {-07d 00' 33"}
SUN_DIST:        110.04 [deg]   Sun_angle= 9.9 [hr] (West of Sun)
MOON_POSTN:      189.14d {+12h 36m 34s}   -9.42d {-09d 25' 08"}
MOON_DIST:        84.02 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      122.04, 42.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.84, 65.83 [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:     Tue 02 Mar 10 20:05:57 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     414592,   Seg_Num: 0
GRB_RA:          195.5168d {+13h 02m 04.03s} (J2000),
                 195.5921d {+13h 02m 22.10s} (current),
                 195.1458d {+13h 00m 34.99s} (1950)
GRB_DEC:         +74.5901d {+74d 35' 24.3"} (J2000),
                 +74.5356d {+74d 32' 08.0"} (current),
                 +74.8586d {+74d 51' 30.9"} (1950)
GRB_ERROR:       4.4 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15257 TJD;    61 DOY;   10/03/02
IMG_START_TIME:  71811.00 SOD {19:56:51.00} UT,   224.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       343.52d {+22h 54m 05s}   -7.01d {-07d 00' 33"}
SUN_DIST:        109.99 [deg]   Sun_angle= 9.9 [hr] (West of Sun)
MOON_POSTN:      189.14d {+12h 36m 35s}   -9.42d {-09d 25' 10"}
MOON_DIST:        84.05 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      121.97, 42.52 [deg] galactic lon,lat of the burst
ECL_COORDS:      128.82, 65.89 [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 0.11% < P(seren) < 0.58%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 02 Mar 10 20:06:12 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     414592,   Seg_Num: 0
POINT_RA:        195.322d {+13h 01m 17s} (J2000)
POINT_DEC:       +74.562d {+74d 33' 43"} (J2000)
ROLL:            33.831d
IMG_START_DATE:  15257 TJD;    61 DOY;   10/03/02
IMG_START_TIME:  71877.11 SOD {19:57:57.11} UT,   290.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     289252682
X_OFFSET:        1205 [pixels]
Y_OFFSET:        882 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1365
Y_GRB_POS:       1042
BINNING_INDEX:   1
IM_URL:          sw00414592000msuni0296.fits
SUN_POSTN:       343.52d {+22h 54m 05s}   -7.01d {-07d 00' 33"}
SUN_DIST:        110.04 [deg]   Sun_angle= 9.9 [hr] (West of Sun)
MOON_POSTN:      189.15d {+12h 36m 35s}   -9.42d {-09d 25' 14"}
MOON_DIST:        84.02 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      122.04, 42.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.84, 65.83 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 02 Mar 10 20:10:50 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     414592,   Seg_Num: 0
POINT_RA:        195.321d {+13h 01m 17s} (J2000)
POINT_DEC:       +74.562d {+74d 33' 43"} (J2000)
POINT_ROLL:      33.830d
IMG_START_DATE:  15257 TJD;    61 DOY;   10/03/02
IMG_START_TIME:  72453.82 SOD {20:07:33.82} UT,   867.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.159
N_STARS:         124
X_OFFSET:        608 [pixels]
Y_OFFSET:        322 [pixels]
X_MAX:           2047 [pixels]
Y_MAX:           1761 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00414592000msufc0867.fits
SUN_POSTN:       343.53d {+22h 54m 06s}   -7.01d {-07d 00' 28"}
SUN_DIST:        110.04 [deg]   Sun_angle= 9.9 [hr] (West of Sun)
MOON_POSTN:      189.19d {+12h 36m 46s}   -9.44d {-09d 26' 22"}
MOON_DIST:        84.04 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      122.04, 42.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.84, 65.83 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 02 Mar 10 20:11:17 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     414592,   Seg_Num: 0
POINT_RA:        195.321d {+13h 01m 17s} (J2000)
POINT_DEC:       +74.562d {+74d 33' 43"} (J2000)
POINT_ROLL:      33.830d
IMG_START_DATE:  15257 TJD;    61 DOY;   10/03/02
IMG_START_TIME:  72453.82 SOD {20:07:33.82} UT,   867.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.159
N_STARS:         124
X_OFFSET:        608 [pixels]
Y_OFFSET:        322 [pixels]
X_MAX:           2047 [pixels]
Y_MAX:           1761 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00414592000msufc0867.fits
SUN_POSTN:       343.53d {+22h 54m 06s}   -7.01d {-07d 00' 28"}
SUN_DIST:        110.04 [deg]   Sun_angle= 9.9 [hr] (West of Sun)
MOON_POSTN:      189.19d {+12h 36m 47s}   -9.44d {-09d 26' 28"}
MOON_DIST:        84.04 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      122.04, 42.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.84, 65.83 [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 02 Mar 10 20:10:50 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     414592,   Seg_Num: 0
POINT_RA:        195.321d {+13h 01m 17s} (J2000)
POINT_DEC:       +74.562d {+74d 33' 43"} (J2000)
POINT_ROLL:      33.830d
IMG_START_DATE:  15257 TJD;    61 DOY;   10/03/02
IMG_START_TIME:  72453.82 SOD {20:07:33.82} UT,   867.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.159
N_STARS:         124
X_OFFSET:        608 [pixels]
Y_OFFSET:        322 [pixels]
X_MAX:           2047 [pixels]
Y_MAX:           1761 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00414592000msufc0867.fits
SUN_POSTN:       343.53d {+22h 54m 06s}   -7.01d {-07d 00' 28"}
SUN_DIST:        110.04 [deg]   Sun_angle= 9.9 [hr] (West of Sun)
MOON_POSTN:      189.19d {+12h 36m 46s}   -9.44d {-09d 26' 22"}
MOON_DIST:        84.04 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      122.04, 42.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.84, 65.83 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 02 Mar 10 20:12:11 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     414592,   Seg_Num: 0
POINT_RA:        195.321d {+13h 01m 17s} (J2000)
POINT_DEC:       +74.562d {+74d 33' 43"} (J2000)
ROLL:            33.830d
IMG_START_DATE:  15257 TJD;    61 DOY;   10/03/02
IMG_START_TIME:  72453.82 SOD {20:07:33.82} UT,   867.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     289253259
X_OFFSET:        1167 [pixels]
Y_OFFSET:        881 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1327
Y_GRB_POS:       1041
BINNING_INDEX:   1
IM_URL:          sw00414592000msuni0873.fits
SUN_POSTN:       343.53d {+22h 54m 06s}   -7.01d {-07d 00' 27"}
SUN_DIST:        110.04 [deg]   Sun_angle= 9.9 [hr] (West of Sun)
MOON_POSTN:      189.20d {+12h 36m 49s}   -9.45d {-09d 26' 42"}
MOON_DIST:        84.04 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      122.04, 42.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.84, 65.83 [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 02 Mar 10 20:12:33 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     414592,   Seg_Num: 0
POINT_RA:        195.321d {+13h 01m 17s} (J2000)
POINT_DEC:       +74.562d {+74d 33' 43"} (J2000)
ROLL:            33.830d
IMG_START_DATE:  15257 TJD;    61 DOY;   10/03/02
IMG_START_TIME:  72453.82 SOD {20:07:33.82} UT,   867.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     289253259
X_OFFSET:        1167 [pixels]
Y_OFFSET:        881 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1327
Y_GRB_POS:       1041
BINNING_INDEX:   1
IM_URL:          sw00414592000msuni0873.fits
SUN_POSTN:       343.53d {+22h 54m 06s}   -7.01d {-07d 00' 27"}
SUN_DIST:        110.04 [deg]   Sun_angle= 9.9 [hr] (West of Sun)
MOON_POSTN:      189.21d {+12h 36m 49s}   -9.45d {-09d 26' 47"}
MOON_DIST:        84.04 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      122.04, 42.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      128.84, 65.83 [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 #10458
J. R. Cummings (NASA/UMBC), A. P. Beardmore (U Leicester), D. N. Burrows (PSU), N. Gehrels (NASA/GSFC), J. M. Gelbord (PSU), O. Godet (U Leicester), D. Grupe (PSU), S. T. Holland (CRESST/USRA/GSFC), S. Immler (CRESST/GSFC/UMD), J. A. Kennea (PSU), R. Margutti (Univ Bicocca&OAB), F. E. Marshall (NASA/GSFC), P. T. O'Brien (U Leicester), M. Perri (ASDC), M. H. Siegel (PSU), M. A. Stark (PSU), E. Troja (NASA/GSFC/ORAU), T. N. Ukwatta (GSFC/GWU) and L. Vetere (PSU) report on behalf of the Swift Team:
At 19:53:06 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 100302A trigger=414592). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 195.344, +74.581 which is
```
   RA(J2000) = 13h 01m 23s
   Dec(J2000) = +74d 34' 51"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single broad peak with a duration of about 35 sec, beginning about 40 sec after the trigger time (the beginning of the 64-second interval for this "image trigger"). The peak count rate was ~500 counts/sec (15-350 keV), at ~55 sec after the trigger.
The XRT began observing the field at 19:55:11.9 UT, 125.4 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source with an enhanced position: RA, Dec 195.5146, 74.5895 which is equivalent to:
```
   RA(J2000)  = 13h 02m 3.50s
   Dec(J2000) = +74d 35' 22.1"
```
with an uncertainty of 2.3 arcseconds (radius, 90% containment). This location is 166 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 consistent with the Galactic value of 1.92e+20 cm^-2 (Kalberla et al. 2005).
The initial flux in the 2.5 s image was 1.96e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 132 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 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. 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 J. R. Cummings (jayc AT milkyway.gsfc.nasa.gov). 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 #10459
J. Haislip, K. Ivarsen, A. LaCluyze, D. Reichart, R. Egger, A. Foster, J. Moore, A. Oza, M. Schubel, J. Styblova, A. Trotter, J. A. Crain, and M. Nysewander report:
Skynet observed the Swift/BAT localization of GRB 100302A (Cummings et al., GCN 10458) with the 16" telescope at the Dolomiti Astronomical Observatory in Italy beginning 2.7 minutes after the trigger (1.3 minutes after notification) in Red, which we have calibrated to R.
We do not detect the afterglow (Cummings et al., GCN 10458). Stacking only images that increase the limiting magnitude yields:
```
mean                                             1-sig.  1-sig.
time                         3-sig.              sys.    stat.
since                        lim.    cal.        cal.    cal.
trig.  tel.  exp.      fil.  mag.    stars       unc.    unc.
(m)          (# x s)                             (mag)   (mag)

73.3   DAO   28 x 160  Red   20.3    78 USNO B1  0.429   0.000
```
GCN Circular #10460
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 478 s of XRT Photon Counting mode data and 1 UVOT images for GRB 100302A, 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 = 195.51524, +74.58959 which is equivalent to:
```
RA (J2000): 13h 02m 3.66s
Dec (J2000): +74d 35' 22.5"
```
with an uncertainty of 1.9 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 #10460
GRB 1000302A : A possible afterglow candidate
K.Y. Huang (ASIAA), H.Y. Hsiao, and Y. Urata (NCU) on behalf of the EAFON team.
We took several R and I band images for the GRB 1000302A field (Cummings et al. GCN 10458) with Lulin 1-m telescope in Taiwan. The observations started at 16 mins after the bursts. Our R-band combined image (300sx5) shows a marginal source (R~ 21) in the XRT error circle. However, the source is clearly detected (I~ 19.9) in our single I(300s)-band image taken around 44 mins after the burst.
No observations will be made with LOT becasue of morning twilight. Further deep observations are encouraged to confirm variability of this candidate. The brightness of the candidate were calibrated with a nearby USNOB star.
This message can be cited
GCN Circular #10462
J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), 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 the recent telemetry downlink, we report further analysis of BAT GRB 100302A (trigger #414592) (Cummings, et al., GCN Circ. 10458). The BAT ground-calculated position is RA, Dec = 195.504, 74.568 deg which is
```
    RA(J2000)  =  13h 02m 01.0s
    Dec(J2000) = +74d 34' 04.0"
```
with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 98%.
The mask-weighted light curve shows one group of multiple overlapping peaks from T+40 to T+70. T90 (15-350 keV) is 17.9 +- 1.7 sec (estimated error including systematics).
The time-averaged spectrum from T+47.6 to T+67.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.72 +- 0.19. The fluence in the 15-150 keV band is 3.1 +- 0.4 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+63.87 sec in the 15-150 keV band is 0.5 +- 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/414592/BA/
GCN Circular #10463
V.Yurkov, S.Sergienko, D.Varda, Blagoveschensk Educational State University, Blagoveschensk
E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zemnukhov, M. Kornilov Sternberg Astronomical Institute, Moscow State University
A. Tlatov, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory
V.Krushinski, I.Zalozhnih, T.Kopytova, A. Popov Ural State University, Kourovka
K.Ivanov, S.Yazev, N.M.Budnev, E.Konstantinov, V.Lenok Irkutsk State University
MASTER robotic telescope (MASTER-Net: http://observ.pereplet.ru, 200 mm, FOV=8 square degrees (testing telescope) and Very Wide Field Camera (D=50 mm, 1000 square degrees, 11 Mpx, 36" per pix, mounted on telescope) located at Blagoveschensk was responted to the GRB 100302A (Swift Bat alert, Cummings et al, GCN CIRC 10458) 51 sec after Notice time and 139 s after the GRB time.
There is now OT in our images inside Swift XRT error box (Goad et al., GCN CIRC 10460).
```
GRB_time     start UT       end UT       t_exp(s)   mlim     Coadd?
-------------------------------------------------------------------

139s          19:55:25      19:55:55       30       16.9       no
139s-4046s    19:55:25      21:14:17     4020       18.5       68
```
The coadded image is available at http://observ.pereplet.ru/images/GRB100302A/GRB_summ.jpg . The message may be cited.
mailto: lipunov@sai.msu.ru
GCN Circular #10464
B. Dintinjana and H. Mikuz on behalf of PIKA observing program at Crni Vrh Observatory.
We observed the field of GRB 100302A (Cummings et al., GCN 10458) from Crni Vrh Observatory with a 60 cm robotic telescope, R filter and CCD. Twenty consecutive exposures of 60 second duration were taken in moonlight conditions. First exposure started at 2010-03-02 19:56:20 UT, 194 seconds after the burst (105 seconds after the SWIFT trigger).
No optical candidate was detected within the uncertainty radius on single exposures, having R limiting magnitude 18.3, calibrated against the nerby USNO-B R2 magnitude stars. Also we found no optical candidate on 20 sumed R images with total exposure of 1200 seconds and limiting R band magnitude 19.6 (calibrated against the nerby USNO-B R2 magnitude stars).
GCN Circular #10465
A. Cucchiara, D. B. Fox (PSU) report on behalf of a larger collaboration:
"On March 3.40 UT we observed the field of GRB 100302A (Cummings et al., GCN 10458) with the Gemini-N telescope and the GMOS spectrograph.
In our 300s i'-band acquisition image we clearly identify a source inside the XRT refined error circle (Goad et al. 10460). Using 3 USNO-B1 stars we calibrated our photometry and obtained
i' = 22.01 +- 0.05 mag
This value is significantly below the detection reported by Huang et al. (GCN 10461) confirming that this is the afterglow of GRB 100302A.
We also performed a single 1200s spectroscopic observation. No absorption or emission features have been detected over the 4000-9000A coverage of our spectrum.
We thank the Gemini staff for performing this observation, in particular Andrew Stephens."
GCN Circular #10466
R. Chornock (Harvard), A. Cucchiara, D. Fox (Penn St.), and E. Berger (Harvard) report on behalf of a larger collaboration:
Further analysis of the Gemini-North GMOS spectrum of the afterglow (Huang et al., GCN 10461) of GRB 100302A (Cummings et al., GCN 10458) described in GCN 10465 (Cucchiara et al.) reveals that the afterglow shows a sharp increase in continuum flux redward of 7100 Angs, with only a weak continuum detected between 5500 and 7000 Angs, consistent with absorption by H I at z~4.8. There are several narrow absorption features superposed on the noisy red continuum, consistent with N V, Si II, Si II*, and C II at a mean redshift of 4.813, which we identify as the redshift of this burst.
GCN Circular #10467
V. D'Elia, M. Perri (ASDC) and J.R. Cummings (NASA/UMBC) report on behalf of the Swift-XRT team:
We have analysed the first 3 orbits of Swift-XRT data obtained from GRB 100302A (trigger 414592; Cummings, et al., GCN Circ. 10458) from 125 s to 28.8 ks after the BAT trigger.
The best position of the X-ray afterglow is the UVOT enhanced XRT position given in Goad et al. (GCN Circ. 10460).
The 0.3-10 keV light curve shows a multiple peak structure, with three main spikes at about T+200, T+250 and T+400s, followed by a fast decay with index 3.35+-0.3 and by a break at 1ks. Later time data are fitted by a second power law with a decay index of 0.26+-0.12.
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.28 (-0.15, +0.17). The best-fitting absorption column is 1.1 (-0.20, +0.17) x 10^21 cm^-2, in excess of the Galactic value of 1.9 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.
If the light curve continues to decay with a power-law decay index of 0.26, the count rate at T+24 hours will be 0.01 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.3 x 10^-13 (4.7 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00414592.
This circular is an official product of the Swift-XRT team.
GCN Circular #10468
M. A. Stark (PSU) and J. R. Cummings (NASA/UMBC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 100302A 132 s after the BAT trigger (Cummings et al., GCN 10458). No optical afterglow consistent with the XRT position (Cummings et al., GCN 10458) is detected in the initial UVOT exposures. We do not see any source within the XRT error circle that might correspond to the R and I-band source reported by Huang et al. (GCN 10461) from the Lulin 1-meter telescope or the i' source reported by Cucchiara and Fox (GCN 10465) from Gemini-N.
Preliminary 3-sigma upper limits using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for the initial exposures are:
```
Filter     T_start(s)   T_stop(s)   Exp(s)   Mag
---------------------------------------------------
white_FC   133          282         147      >21.06
white      133          2044        431      >21.24
v          621          1933        156      >18.82
b          547          2032        136      >19.58
u          291          2007        382      >20.10
w1         670          1982        155      >19.49
m2         645          1957        136      >19.26
w2         596          1908        156      >19.61
```
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 #10469
K. Hornoch (Astronomical Institute, Academy of Sciences of the Czech Republic) & P. Kubanek (IPL UV Valencia & IAA CSIC Granada, Spain) reports on behalf of a larger collaboration:
We acquired unfiltered CCD images of GRB 100302A XRT error box (J.R.Cummings, GCN 10458) with Ondrejov 65cm telescope + CCD. AS the CCD is equipped with IR-block filter its sensitivity in I band is very close to 0.
Observation started March 3 00:40 UT (4h47m after the BAT trigger). During observation which run till 03:00 UT 45 of 3 minutes exposures were obtained. On the combined image we do not identify any new object down to R ~22 magnitude. Particularly we do not see anything significant at the proposed OT position (K.Y. Huang, GCN 10461).
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GCN Circular #10480
GRB100302A : LOAO observations and Lulin afterglow analysis
K.Y. Huang (ASIAA), Myungshin Im (CEOU/Seoul National Univ) and Y. Urata (NCU) on behalf of EAFON team :
We observed GRB100302A afterglow position (Goad et al. GCN 10460, Huang et al. GCN 10461 and Cucchiarar & Fox GCN 10465) in i-band (12x300s) using 1.0 telescope at Mt. Lemmon (Arizona, US) operated by the Korea Astronomy Space Science Institute.
No significant detection of afterglow in our i-band combined image at 11.0709 hours after the burst. The 3-sigma limiting magnitude is 20.8, which calibrated with five nearby USNOB stars.
We also reduced R and i band images taken by Lulin 1-m telescopes. Our photometric results, combined with the i-band detection reported by Cucchiarar & Fox (GCN 10465), indicate the i-band power law index is about -0.65.
```
Delay time    filter   EXPTIME    Magnitude   error
   (hour)
---------------------------------------------------
   0.450        R       300s x 5   21.54      0.22
   0.780        I        300s      20.02      0.12
   0.873        I        300s      20.24      0.15
   0.966        I        300s      20.08      0.13
   1.060        I        300s      20.17      0.17
   1.153        I        300s      20.34      0.19
   1.357        I      300s x 4    20.31      0.17
--------------------------------------------------
```
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GCN Report 275.1
GCN_Report 275.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_275_1.pdf by J.R. Cummings at CRESST/GSFC titled: "Final Swift Observations of GRB 100302A"

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Jochen Greiner, last update: 02-Mar-2010 [Disclaimer]