Gamma-ray Burst 090401B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Apr 09 08:35:38 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     348152,   Seg_Num: 0
GRB_RA:           95.101d {+06h 20m 24s} (J2000),
                  95.211d {+06h 20m 51s} (current),
                  94.504d {+06h 18m 01s} (1950)
GRB_DEC:          -8.963d {-08d 57' 47"} (J2000),
                  -8.968d {-08d 58' 04"} (current),
                  -8.940d {-08d 56' 23"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       938 [cnts]    Image_Peak=109 [image_cnts]
TRIGGER_DUR:     0.064 [sec] 
TRIGGER_INDEX:   10427     E_range: 50-350 keV
BKG_INTEN:       32926 [cnts]
BKG_TIME:        30915.37 SOD {08:35:15.37} UT
BKG_DUR:         8 [sec]
GRB_DATE:        14922 TJD;    91 DOY;   09/04/01
GRB_TIME:        30924.65 SOD {08:35:24.65} UT
GRB_PHI:           3.88 [deg]
GRB_THETA:        33.14 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     41.40 [sigma]
IMAGE_SIGNIF:    10.13 [sigma]
MERIT_PARAMS:     +1  +0  +0  -4  +3  +0  +0  +0  -8  +0 
SUN_POSTN:        10.81d {+00h 43m 14s}   +4.65d {+04d 38' 47"}
SUN_DIST:         85.22 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       84.72d {+05h 38m 54s}  +26.78d {+26d 46' 38"}
MOON_DIST:        37.17 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      217.48,-10.94 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       95.96,-32.30 [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 = 132.46,20.40 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:        GCN/SIMBAD_NED NOTICE
NOTICE_DATE:  Wed Apr  1 08:35:45 UTC 2009
NOTICE_TYPE:  Swift-BAT Position search
TRIGGER_NUM:  348152
RA:           95.1007 (J2000)
DEC:          -8.9634 (J2000)
 
SIMBAD search for BAT_RA,Dec=95.1007,-8.9634,radius=10.0arcmin
 
Num   RA         Dec                    Name                        Type  Num_Pub  Distance

 1  95.14182167  -8.97236083              TYC 5363-240-1               IR   0      2.50
 2  95.14182167  -8.97236083              TYC 5363-240-1               IR   0      2.50
 3  95.05000000  -9.06666667        [D98] RX J0620.2-0904             Em*   1      6.89
 4  95.04750000  -9.07055556             RX J0620.2-0904                X   1      7.16
 5  95.04791667  -9.07222222        [D98] RX J0620.2-0904               X   1      7.24
 6  95.03599833  -8.83757917                    HD 44199               IR   2      8.47
 
 
 
NED search for BAT_RA,Dec=95.1007,-8.9634,radius=10.0arcmin
 
Num    RA           Dec       Name                           Type      Distance

 1    95.108208    -8.957444  NVSS J062025-085726           , RadioS   0.60
 2    95.149542    -8.943889  NVSS J062035-085638           , RadioS   3.10
 3    95.174250    -8.946194  NVSS J062041-085646           , RadioS   4.50
 4    95.083583    -8.878056  NVSS J062020-085241           , RadioS   5.20
 5    95.166333    -9.036944  NVSS J062039-090213           , RadioS   5.90
 6    95.165667    -9.060194  NVSS J062039-090336           , RadioS   7.00
 7    95.047500    -9.070556  1RXS J062011.4-090414         , XrayS    7.20
 8    95.055167    -8.827389  NVSS J062013-084938           , RadioS   8.60
 9    95.229417    -8.867278  NVSS J062055-085202           , RadioS   9.60

GCN NOTICE

TITLE:        GCN/SIMBAD_NED NOTICE
NOTICE_DATE:  Wed Apr  1 08:37:17 UTC 2009
NOTICE_TYPE:  Swift-XRT Position search
TRIGGER_NUM:  348152
RA:           95.0889 (J2000)
DEC:          -8.9734 (J2000)
 
SIMBAD search for XRT_RA,Dec=95.0889,-8.9734,radius=1.0arcmin
 
Num   RA         Dec                    Name                        Type  Num_Pub  Distance

 
 
NED search for XRT_RA,Dec=95.0889,-8.9734,radius=1.0arcmin
 
Num    RA           Dec       Name                           Type      Distance

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Wed 01 Apr 09 08:36:21 UT
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    5493,   Sub_Num: 0
GRB_INTEN:      9.32 [sigma]   
GRB_TIME:       30923.18 SOD {08:35:23.18} UT
GRB_DATE:       14922 TJD;    91 DOY;   09/04/01
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.
COMMENTS:
ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2009-04-01T08-35-23.0373-24033-00007-0.lc

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Apr 09 08:37:24 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     348152,   Seg_Num: 0
GRB_RA:           95.0889d {+06h 20m 21.3s} (J2000),
                  95.1993d {+06h 20m 47.8s} (current),
                  94.4921d {+06h 17m 58.1s} (1950)
GRB_DEC:          -8.9734d {-08d 58' 24.2"} (J2000),
                  -8.9780d {-08d 58' 40.8"} (current),
                  -8.9501d {-08d 57' 00.5"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       214 [cnts]
IMG_START_DATE:  14922 TJD;    91 DOY;   09/04/01
IMG_START_TIME:  30997.87 SOD {08:36:37.87} UT,   73.2 [sec] since BAT Trigger Time
CENTROID_X:      292.32,  raw= 292  [pixels]
CENTROID_Y:      314.83,  raw= 315  [pixels]
ROLL:            275.50 [deg]
GAIN:            4
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   39.68
GRB_POS_XRT_Z:   -23.52
IMAGE_URL:       sw00348152000msxps_rw.img
SUN_POSTN:        10.81d {+00h 43m 14s}   +4.65d {+04d 38' 49"}
SUN_DIST:         85.21 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       84.74d {+05h 38m 58s}  +26.78d {+26d 46' 36"}
MOON_DIST:        37.17 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      217.48,-10.95 [deg] galactic lon,lat of the burst
ECL_COORDS:       95.95,-32.31 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Apr 09 08:37:31 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     348152,   Seg_Num: 0
GRB_RA:           95.0889d {+06h 20m 21.3s} (J2000),
                  95.1993d {+06h 20m 47.8s} (current),
                  94.4921d {+06h 17m 58.1s} (1950)
GRB_DEC:          -8.9734d {-08d 58' 24.2"} (J2000),
                  -8.9780d {-08d 58' 40.8"} (current),
                  -8.9501d {-08d 57' 00.5"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       214 [cnts]
IMG_START_DATE:  14922 TJD;    91 DOY;   09/04/01
IMG_START_TIME:  30997.87 SOD {08:36:37.87} UT,   73.2 [sec] since BAT Trigger Time
CENTROID_X:      292.32,  raw= 292  [pixels]
CENTROID_Y:      314.83,  raw= 315  [pixels]
ROLL:            275.50 [deg]
GAIN:            4
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   39.68
GRB_POS_XRT_Z:   -23.52
IMAGE_URL:       sw00348152000msxps_rw.img
SUN_POSTN:        10.81d {+00h 43m 14s}   +4.65d {+04d 38' 49"}
SUN_DIST:         85.21 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       84.74d {+05h 38m 59s}  +26.78d {+26d 46' 36"}
MOON_DIST:        37.17 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      217.48,-10.95 [deg] galactic lon,lat of the burst
ECL_COORDS:       95.95,-32.31 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Apr 09 08:37:15 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     348152,   Seg_Num: 0
GRB_RA:           95.0889d {+06h 20m 21.33s} (J2000),
                  95.1993d {+06h 20m 47.83s} (current),
                  94.4921d {+06h 17m 58.11s} (1950)
GRB_DEC:          -8.9734d {-08d 58' 24.2"} (J2000),
                  -8.9780d {-08d 58' 40.8"} (current),
                  -8.9501d {-08d 57' 00.5"} (1950)
GRB_ERROR:       4.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.01e-08 [erg/cm2/sec]
GRB_SIGNIF:      14.62 [sigma]
IMG_START_DATE:  14922 TJD;    91 DOY;   09/04/01
IMG_START_TIME:  30997.87 SOD {08:36:37.87} UT,   73.2 [sec] since BAT Trigger Time
TAM[0-3]:        327.65 237.16 261.38 243.40
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        10.81d {+00h 43m 14s}   +4.65d {+04d 38' 49"}
SUN_DIST:         85.21 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       84.74d {+05h 38m 58s}  +26.78d {+26d 46' 36"}
MOON_DIST:        37.17 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      217.48,-10.95 [deg] galactic lon,lat of the burst
ECL_COORDS:       95.95,-32.31 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.92 arcmin from the BAT position.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Apr 09 08:39:00 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     348152,   Seg_Num: 0
GRB_RA:           95.101d {+06h 20m 24s} (J2000),
                  95.211d {+06h 20m 51s} (current),
                  94.504d {+06h 18m 01s} (1950)
GRB_DEC:          -8.963d {-08d 57' 47"} (J2000),
                  -8.968d {-08d 58' 04"} (current),
                  -8.940d {-08d 56' 23"} (1950)
GRB_DATE:        14922 TJD;    91 DOY;   09/04/01
GRB_TIME:        30924.86 SOD {08:35:24.86} UT
TRIGGER_INDEX:   10427
GRB_PHI:           3.88 [deg]
GRB_THETA:        33.14 [deg]
DELTA_TIME:      11.00 [sec]
TRIGGER_DUR:     0.064 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     41.40 [sigma]
IMAGE_SIGNIF:    10.13 [sigma]
LC_URL:          sw00348152000msb.lc
SUN_POSTN:        10.81d {+00h 43m 14s}   +4.65d {+04d 38' 50"}
SUN_DIST:         85.22 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       84.76d {+05h 39m 03s}  +26.78d {+26d 46' 34"}
MOON_DIST:        37.15 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      217.48,-10.94 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       95.96,-32.30 [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 = 132.46,20.40 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Apr 09 08:39:41 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     348152,   Seg_Num: 0
POINT_RA:         95.097d {+06h 20m 23s} (J2000)
POINT_DEC:        -8.963d {-08d 57' 45"} (J2000)
POINT_ROLL:      275.500d
IMG_START_DATE:  14922 TJD;    91 DOY;   09/04/01
IMG_START_TIME:  31006.38 SOD {08:36:46.38} UT,   81.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.831
N_STARS:         185
X_OFFSET:        464 [pixels]
Y_OFFSET:        576 [pixels]
X_MAX:           1423 [pixels]
Y_MAX:           1535 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00348152000msufc0081.fits
SUN_POSTN:        10.81d {+00h 43m 14s}   +4.65d {+04d 38' 51"}
SUN_DIST:         85.21 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       84.77d {+05h 39m 05s}  +26.78d {+26d 46' 34"}
MOON_DIST:        37.15 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      217.48,-10.94 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.96,-32.30 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Apr 09 08:40:20 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     348152,   Seg_Num: 0
POINT_RA:         95.097d {+06h 20m 23s} (J2000)
POINT_DEC:        -8.963d {-08d 57' 45"} (J2000)
POINT_ROLL:      275.500d
IMG_START_DATE:  14922 TJD;    91 DOY;   09/04/01
IMG_START_TIME:  31006.38 SOD {08:36:46.38} UT,   81.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.831
N_STARS:         185
X_OFFSET:        464 [pixels]
Y_OFFSET:        576 [pixels]
X_MAX:           1423 [pixels]
Y_MAX:           1535 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00348152000msufc0081.fits
SUN_POSTN:        10.81d {+00h 43m 14s}   +4.65d {+04d 38' 52"}
SUN_DIST:         85.21 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       84.78d {+05h 39m 06s}  +26.78d {+26d 46' 33"}
MOON_DIST:        37.15 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      217.48,-10.94 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.96,-32.30 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Apr 09 08:41:16 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     348152,   Seg_Num: 0
POINT_RA:         95.097d {+06h 20m 23s} (J2000)
POINT_DEC:        -8.963d {-08d 57' 45"} (J2000)
ROLL:            275.500d
IMG_START_DATE:  14922 TJD;    91 DOY;   09/04/01
IMG_START_TIME:  31006.38 SOD {08:36:46.38} UT,   81.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     260267811
X_OFFSET:        807 [pixels]
Y_OFFSET:        796 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       967
Y_GRB_POS:       956
BINNING_INDEX:   1
IM_URL:          sw00348152000msuni0086.fits
SUN_POSTN:        10.81d {+00h 43m 15s}   +4.65d {+04d 38' 53"}
SUN_DIST:         85.21 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       84.79d {+05h 39m 09s}  +26.78d {+26d 46' 32"}
MOON_DIST:        37.15 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      217.48,-10.94 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.96,-32.30 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Apr 09 08:41:36 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     348152,   Seg_Num: 0
POINT_RA:         95.097d {+06h 20m 23s} (J2000)
POINT_DEC:        -8.963d {-08d 57' 45"} (J2000)
ROLL:            275.500d
IMG_START_DATE:  14922 TJD;    91 DOY;   09/04/01
IMG_START_TIME:  31006.38 SOD {08:36:46.38} UT,   81.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     260267811
X_OFFSET:        807 [pixels]
Y_OFFSET:        796 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       967
Y_GRB_POS:       956
BINNING_INDEX:   1
IM_URL:          sw00348152000msuni0086.fits
SUN_POSTN:        10.81d {+00h 43m 15s}   +4.65d {+04d 38' 53"}
SUN_DIST:         85.21 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       84.79d {+05h 39m 10s}  +26.78d {+26d 46' 32"}
MOON_DIST:        37.14 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      217.48,-10.94 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.96,-32.30 [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:        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:     Wed 01 Apr 09 08:39:41 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     348152,   Seg_Num: 0
POINT_RA:         95.097d {+06h 20m 23s} (J2000)
POINT_DEC:        -8.963d {-08d 57' 45"} (J2000)
POINT_ROLL:      275.500d
IMG_START_DATE:  14922 TJD;    91 DOY;   09/04/01
IMG_START_TIME:  31006.38 SOD {08:36:46.38} UT,   81.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.831
N_STARS:         185
X_OFFSET:        464 [pixels]
Y_OFFSET:        576 [pixels]
X_MAX:           1423 [pixels]
Y_MAX:           1535 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00348152000msufc0081.fits
SUN_POSTN:        10.81d {+00h 43m 14s}   +4.65d {+04d 38' 51"}
SUN_DIST:         85.21 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       84.77d {+05h 39m 05s}  +26.78d {+26d 46' 34"}
MOON_DIST:        37.15 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      217.48,-10.94 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.96,-32.30 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Apr 09 08:46:14 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     348152,   Seg_Num: 0
POINT_RA:         95.097d {+06h 20m 23s} (J2000)
POINT_DEC:        -8.965d {-08d 57' 54"} (J2000)
POINT_ROLL:      275.500d
IMG_START_DATE:  14922 TJD;    91 DOY;   09/04/01
IMG_START_TIME:  31218.36 SOD {08:40:18.36} UT,   293.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.892
N_STARS:         140
X_OFFSET:        487 [pixels]
Y_OFFSET:        476 [pixels]
X_MAX:           1446 [pixels]
Y_MAX:           1435 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00348152000msufc0293.fits
SUN_POSTN:        10.81d {+00h 43m 15s}   +4.65d {+04d 38' 57"}
SUN_DIST:         85.21 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       84.84d {+05h 39m 22s}  +26.77d {+26d 46' 26"}
MOON_DIST:        37.13 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      217.48,-10.94 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.96,-32.30 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Apr 09 08:46:41 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     348152,   Seg_Num: 0
POINT_RA:         95.097d {+06h 20m 23s} (J2000)
POINT_DEC:        -8.965d {-08d 57' 54"} (J2000)
POINT_ROLL:      275.500d
IMG_START_DATE:  14922 TJD;    91 DOY;   09/04/01
IMG_START_TIME:  31218.36 SOD {08:40:18.36} UT,   293.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.892
N_STARS:         140
X_OFFSET:        487 [pixels]
Y_OFFSET:        476 [pixels]
X_MAX:           1446 [pixels]
Y_MAX:           1435 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00348152000msufc0293.fits
SUN_POSTN:        10.81d {+00h 43m 15s}   +4.65d {+04d 38' 58"}
SUN_DIST:         85.21 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       84.85d {+05h 39m 23s}  +26.77d {+26d 46' 26"}
MOON_DIST:        37.13 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      217.48,-10.94 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.96,-32.30 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Apr 09 08:46:14 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     348152,   Seg_Num: 0
POINT_RA:         95.097d {+06h 20m 23s} (J2000)
POINT_DEC:        -8.965d {-08d 57' 54"} (J2000)
POINT_ROLL:      275.500d
IMG_START_DATE:  14922 TJD;    91 DOY;   09/04/01
IMG_START_TIME:  31218.36 SOD {08:40:18.36} UT,   293.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.892
N_STARS:         140
X_OFFSET:        487 [pixels]
Y_OFFSET:        476 [pixels]
X_MAX:           1446 [pixels]
Y_MAX:           1435 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00348152000msufc0293.fits
SUN_POSTN:        10.81d {+00h 43m 15s}   +4.65d {+04d 38' 57"}
SUN_DIST:         85.21 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       84.84d {+05h 39m 22s}  +26.77d {+26d 46' 26"}
MOON_DIST:        37.13 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      217.48,-10.94 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.96,-32.30 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Apr 09 08:47:37 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     348152,   Seg_Num: 0
POINT_RA:         95.097d {+06h 20m 23s} (J2000)
POINT_DEC:        -8.965d {-08d 57' 54"} (J2000)
ROLL:            275.500d
IMG_START_DATE:  14922 TJD;    91 DOY;   09/04/01
IMG_START_TIME:  31218.36 SOD {08:40:18.36} UT,   293.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     260268022
X_OFFSET:        807 [pixels]
Y_OFFSET:        796 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       967
Y_GRB_POS:       956
BINNING_INDEX:   1
IM_URL:          sw00348152000msuni0298.fits
SUN_POSTN:        10.81d {+00h 43m 15s}   +4.65d {+04d 38' 59"}
SUN_DIST:         85.21 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       84.86d {+05h 39m 25s}  +26.77d {+26d 46' 25"}
MOON_DIST:        37.13 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      217.48,-10.94 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.96,-32.30 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Apr 09 08:48:03 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     348152,   Seg_Num: 0
POINT_RA:         95.097d {+06h 20m 23s} (J2000)
POINT_DEC:        -8.965d {-08d 57' 54"} (J2000)
ROLL:            275.500d
IMG_START_DATE:  14922 TJD;    91 DOY;   09/04/01
IMG_START_TIME:  31218.36 SOD {08:40:18.36} UT,   293.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     260268022
X_OFFSET:        807 [pixels]
Y_OFFSET:        796 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       967
Y_GRB_POS:       956
BINNING_INDEX:   1
IM_URL:          sw00348152000msuni0298.fits
SUN_POSTN:        10.81d {+00h 43m 16s}   +4.65d {+04d 38' 59"}
SUN_DIST:         85.21 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       84.86d {+05h 39m 27s}  +26.77d {+26d 46' 24"}
MOON_DIST:        37.13 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      217.48,-10.94 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.96,-32.30 [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:        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:     Wed 01 Apr 09 08:53:01 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     348152,   Seg_Num: 0
POINT_RA:         95.097d {+06h 20m 23s} (J2000)
POINT_DEC:        -8.965d {-08d 57' 54"} (J2000)
POINT_ROLL:      275.500d
IMG_START_DATE:  14922 TJD;    91 DOY;   09/04/01
IMG_START_TIME:  31798.66 SOD {08:49:58.66} UT,   874.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.776
N_STARS:         190
X_OFFSET:        247 [pixels]
Y_OFFSET:        236 [pixels]
X_MAX:           1686 [pixels]
Y_MAX:           1675 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00348152000msufc0874.fits
SUN_POSTN:        10.82d {+00h 43m 16s}   +4.65d {+04d 39' 04"}
SUN_DIST:         85.20 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       84.92d {+05h 39m 40s}  +26.77d {+26d 46' 19"}
MOON_DIST:        37.11 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      217.48,-10.94 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.96,-32.30 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Apr 09 08:53:29 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     348152,   Seg_Num: 0
POINT_RA:         95.097d {+06h 20m 23s} (J2000)
POINT_DEC:        -8.965d {-08d 57' 54"} (J2000)
POINT_ROLL:      275.500d
IMG_START_DATE:  14922 TJD;    91 DOY;   09/04/01
IMG_START_TIME:  31798.66 SOD {08:49:58.66} UT,   874.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.776
N_STARS:         190
X_OFFSET:        247 [pixels]
Y_OFFSET:        236 [pixels]
X_MAX:           1686 [pixels]
Y_MAX:           1675 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00348152000msufc0874.fits
SUN_POSTN:        10.82d {+00h 43m 16s}   +4.65d {+04d 39' 04"}
SUN_DIST:         85.20 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       84.92d {+05h 39m 41s}  +26.77d {+26d 46' 18"}
MOON_DIST:        37.11 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      217.48,-10.94 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.96,-32.30 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Apr 09 08:53:01 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     348152,   Seg_Num: 0
POINT_RA:         95.097d {+06h 20m 23s} (J2000)
POINT_DEC:        -8.965d {-08d 57' 54"} (J2000)
POINT_ROLL:      275.500d
IMG_START_DATE:  14922 TJD;    91 DOY;   09/04/01
IMG_START_TIME:  31798.66 SOD {08:49:58.66} UT,   874.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.776
N_STARS:         190
X_OFFSET:        247 [pixels]
Y_OFFSET:        236 [pixels]
X_MAX:           1686 [pixels]
Y_MAX:           1675 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00348152000msufc0874.fits
SUN_POSTN:        10.82d {+00h 43m 16s}   +4.65d {+04d 39' 04"}
SUN_DIST:         85.20 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       84.92d {+05h 39m 40s}  +26.77d {+26d 46' 19"}
MOON_DIST:        37.11 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      217.48,-10.94 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.96,-32.30 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Apr 09 08:54:28 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     348152,   Seg_Num: 0
POINT_RA:         95.097d {+06h 20m 23s} (J2000)
POINT_DEC:        -8.965d {-08d 57' 54"} (J2000)
ROLL:            275.500d
IMG_START_DATE:  14922 TJD;    91 DOY;   09/04/01
IMG_START_TIME:  31798.66 SOD {08:49:58.66} UT,   874.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     260268603
X_OFFSET:        806 [pixels]
Y_OFFSET:        795 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       966
Y_GRB_POS:       955
BINNING_INDEX:   1
IM_URL:          sw00348152000msuni0879.fits
SUN_POSTN:        10.82d {+00h 43m 17s}   +4.65d {+04d 39' 05"}
SUN_DIST:         85.20 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       84.93d {+05h 39m 44s}  +26.77d {+26d 46' 17"}
MOON_DIST:        37.11 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      217.48,-10.94 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.96,-32.30 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Apr 09 08:54:52 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     348152,   Seg_Num: 0
POINT_RA:         95.097d {+06h 20m 23s} (J2000)
POINT_DEC:        -8.965d {-08d 57' 54"} (J2000)
ROLL:            275.500d
IMG_START_DATE:  14922 TJD;    91 DOY;   09/04/01
IMG_START_TIME:  31798.66 SOD {08:49:58.66} UT,   874.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     260268603
X_OFFSET:        806 [pixels]
Y_OFFSET:        795 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       966
Y_GRB_POS:       955
BINNING_INDEX:   1
IM_URL:          sw00348152000msuni0879.fits
SUN_POSTN:        10.82d {+00h 43m 17s}   +4.65d {+04d 39' 06"}
SUN_DIST:         85.20 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       84.94d {+05h 39m 45s}  +26.77d {+26d 46' 17"}
MOON_DIST:        37.11 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      217.48,-10.94 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.96,-32.30 [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 #9066
P. Schady (MSSL-UCL), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), O. Godet (U Leicester), H. A. Krimm (CRESST/GSFC/USRA), J. Mao (INAF-OAB), P. T. O'Brien (U Leicester), S. R. Oates (UCL-MSSL), J. P. Osborne (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), A. M. Parsons (GSFC), P. Romano (INAF-IASFPA), B. A. Rowlinson (U Leicester) and H. Ziaeepour (UCL-MSSL) report on behalf of the Swift Team:
At 08:35:25 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 090401B (trigger=348152). The BAT on-board calculated location is RA, Dec 95.101d, -8.963d which is
```
   RA(J2000)  =  06h 20m 24s
   Dec(J2000) = -8d 57' 47"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows at least four overlapping peaks with a total duration of ~20 seconds. The peak count rate was ~55,000 counts/sec (15-350 keV), at ~8 sec after the trigger.
The XRT began observing the field at 08:36:37.9 UT, 73.2 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 95.0889, -8.9734 which is equivalent to:
```
   RA(J2000)  = 06h 20m 21.33s
   Dec(J2000) = -08d 58' 24.2"
```
with an uncertainty of 4.7 arcseconds (radius, 90% containment). This location is 57 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy.
UVOT took a finding chart exposure of 150 seconds with the White filter starting 81 seconds after the BAT trigger. No credible afterglow candidate has been found in the automatic analysis. 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, although we note that there are two bright known sources within the XRT error circle that may be confusing source detection. One of these sources appears to be brighter and slightly offset from the DSS position, suggesting the possible detection of the optical afterglow. However, we shall need more data to check for any variability. The coverage of the XRT error circle by the 8'x8' region for the list of sources generated on-board is uncertain because the large number of sources filled the available telemetry. No correction has been made for the expected extinction corresponding to E(B-V) of 0.67.
Burst Advocate for this burst is P. Schady (ps AT mssl.ucl.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 #9067
P.Schady (MSSL-UCL) and S.R.Oates report on behalf of the Swift/UVOT team
Following from the tentative UVOT afterglow detection of GRB090401B reported in Schady et al. (GCN 9066), we here report a fading by over two magnitudes between the two UVOT white finding charts, taken 792s apart at the following position
```
RA (J2000) = 06:20:21.11 (95.08775deg)
Dec (J2000) = -08:58:19.5 (-8.97199deg)
```
with an estimated uncertainty of 0.5 arcsec (radius, 90% confidence), suggesting this to be the optical afterglow of GRB090401B. This position falls on a known source, making absolute magnitudes and a precise localisation difficult at this stage, and further data will be required in order to carry out source subtraction.
The values quoted above are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.67 in the direction of the burst (Schlegel et al. 1998). All photometry is on the UVOT photometry system described in Poole et al. (2008, MNRAS, 383, 627).
GCN Circular #9068
M. Stamatikos (GSFC/ORAU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (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), P. Schady (MSSL-UCL), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+914 sec from the recent telemetry downlink, we report further analysis of BAT GRB 090401B (trigger #348152) (Schady, et al., GCN Circ. 9066). The BAT ground-calculated position is RA, Dec = 95.095, -8.963 deg, which is
```
   RA(J2000)  =  06h 20m 22.7s 
   Dec(J2000) = -08d 57' 47.1" 
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 67%.
The mask-weighted light curve shows several FRED-like peaks with the first starting at ~T-0.4 sec. The brightest peak is at ~T+7 sec with a long exponential tail out to ~T+600 sec. T90 (15-350 keV) is 183 +- 39 sec (estimated error including systematics).
The time-averaged spectrum from T-0.1 to T+326.1 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.37 +- 0.05. The fluence in the 15-150 keV band is 1.0 +- 0.0 x 10^-5 erg/cm2. The 1-sec peak photon flux measured from T+6.49 sec in the 15-150 keV band is 23.1 +- 0.5 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/348152/BA/
GCN Circular #9069
E. Moretti, F. Longo, G. Barbiellini, E. Vallazza (INFN Trieste), A. Giuliani (INAF/IASF Milan), S. Cutini, C. Pittori (ASDC), A. Chen, S. Mereghetti, F. Perotti, P. Caraveo (INAF/IASF Milan), E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, L. Pacciani, P. Soffitta, E. Costa, F. Lazzarotto, I. Lapshov, M. Rapisarda (INAF/IASF Rome), A. Pellizzoni, M. Pilia (INAF/OA Cagliari), S. Vercellone (INAF/IASF Palermo), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, A. Argan, A. Trois, G. Piano, S. Sabatini (INAF/IASF Rome), P. Picozza, A. Morselli (INFN Roma-2), M. Prest (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), A.Rappoldi, P. Cattaneo (INFN Pavia) and P. Giommi, P. Santolamazza F.Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:
The gamma ray burst 090401B (Schady et al. GCN 9066 & 9067) occurred in the field of view of AGILE, approximately 41 deg off-axis. This 12-s long event was triggered and localized in one dimension by SuperAGILE. It was detected also by the AGILE/ACS and MCAL, with significant detection above 2.8 MeV.
A preliminary analysis of the Gamma-Ray Imaging Detector (GRID) data in temporal and spatial coincidence with the GRB shows a significant excess of gamma-ray events above 30 MeV at the location of the event.
A more detailed analysis of the AGILE-GRID data is in progress. More observations of this interesting burst are strongly encouraged.
This message may be cited.
GCN Circular #9070
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 2409 s of XRT Photon Counting mode data and 5 UVOT images for GRB 090401B, 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 = 95.08773, -8.97244 which is equivalent to:
```
RA (J2000): 06h 20m 21.06s
Dec (J2000): -08d 58' 20.8"
```
with an uncertainty of 1.7 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, arXiv:0812.3662).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #9074
P. Schady (MSSL-UCL) and S.R.Oates (MSSL-UCL) reports on behalf of the Swift/UVOT team:
Swift UVOT began settled exposures of GRB090401B (Schady et al, GCN 9066) 82 s after the burst trigger, and detected a bright optical transient at the position reported in by Schady et al. (GCN 9067), consistent with the enhanced XRT error circle (Osborne et al, GCN 9070).
The source is detected in the white, v, b and u filter, but not in any of UV filters, placing an upper limit on the redshift of z < 3. We note that the afterglow lies close to a known source, which may be contaminating our phometry. The light curve decays steeply at early times at a rate of alpha_1~1.5, and then breaks at ~T+440s to a slope of alpha_2~0.7.
Using 2.5arcsec aperture, the magnitudes and 3 sigma upper limits to our observations our reported below:
```
Filt    T_start (s)  T_stop (s)  Exp (s)  Mag/3-sig UL
white      82           232       147     16.83+/-0.02
white      874          1024      147     19.14+/-0.08
v          623          1248      78      18.31+/-0.20
v          4753         4953      197     19.10+/-0.25
b          549          1346      58      19.48+/-0.26
b          5573         5773      197     20.39+/-0.28
u          293          543       246     17.99+/-0.07
u          698          1312      58      18.67+/-0.22
uvw1       672          1297      78        > 19.42
uvm2       647          1272      78        > 18.99
uvw2       599          1387      78        > 19.39
```
The above magnitudes have not been corrected for the Galactic extinction corresponding to E(B-V) = 0.67 (Schlegel et al 1998). The photometry is on the UVOT flight system described in Poole et al (2008, MNRAS, 383,627)
GCN Circular #9075
A.Giuliani (INAF/IASF Milan), S.Cutini, C. Pittori (ASDC) E. Moretti, F.Longo, G.Barbiellini, E.Vallazza (INFN Trieste), M. Marisaldi, A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Galli, (INAF/IASF Bologna), A. Chen, S. Mereghetti, F. Perotti, P. Caraveo (INAF/IASF Milan), E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, L. Pacciani, P. Soffitta, E. Costa, F. Lazzarotto, I. Lapshov, M. Rapisarda(INAF/IASF Rome), A. Pellizzoni, M. Pilia (INAF/OA Cagliari), S. Vercellone (INAF/IASF Palermo), M. Tavani, G. Pucella, F. D'Ammando, V.Vittorini, A. Argan, A. Trois, G. Piano, S. Sabatini (INAF/IASF Rome), P. Picozza, A. Morselli (INFN Roma-2), M. Prest (Universita` dell'Insubria), P.Lipari, D. Zanello (INFN Roma-1), A.Rappoldi, P.Cattaneo (INFN Pavia) and P. Giommi, P. Santolamazza, F.Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:
A more refined analysis of the AGILE-GRID (Gamma-Ray Imaging Detector) data of GRB 090401B (Moretti et al. GCN 9069) confirms the gamma-ray detection of the GRB at energies above 30 MeV with a statistical significance larger than 4 for a 10-second integration after trigger.
Fluence estimate for a 10 second integration is 0.038+/-0.011 ph/cm2 (above 30 MeV). The GRB 090401B gamma-ray spectrum appears to be relatively hard.
An estimate of fluence in the 500 keV - 10 MeV range, as derived from MCAL data, is (1.6 +/- 0.5)e-5 erg/cm2 in the same time interval.
This message may be cited.
GCN Circular #9076
P. Schady (MSSL-UCL) and S.R.Oates (MSSL-UCL) reports on behalf of the Swift/UVOT team:
Swift UVOT began settled exposures of GRB090401B (Schady et al, GCN 9066) 82 s after the burst trigger, and detected a bright optical transient at the position reported in by Schady et al. (GCN 9067), consistent with the enhanced XRT error circle (Osborne et al, GCN 9070).
The source is detected in the white, v, b and u filter, but not in any of UV filters, placing an upper limit on the redshift of z < 3. We note that the afterglow lies close to a known source, which may be contaminating our phometry. The light curve decays steeply at early times at a rate of alpha_1~1.5, and then breaks at ~T+440s to a slope of alpha_2~0.7.
Using 2.5arcsec aperture, the magnitudes and 3 sigma upper limits to our observations our reported below:
```
Filt    T_start (s)  T_stop (s)  Exp (s)  Mag/3-sig UL
white      82           232       147     16.83+/-0.02
white      874          1024      147     19.14+/-0.08
v          623          1248      78      18.31+/-0.20
v          4753         4953      197     19.10+/-0.25
b          549          1346      58      19.48+/-0.26
b          5573         5773      197     20.39+/-0.28
u          293          543       246     17.99+/-0.07
u          698          1312      58      18.67+/-0.22
uvw1       672          1297      78        > 19.42
uvm2       647          1272      78        > 18.99
uvw2       599          1387      78        > 19.39
```
The above magnitudes have not been corrected for the Galactic extinction corresponding to E(B-V) = 0.67 (Schlegel et al 1998). The photometry is on the UVOT flight system described in Poole et al (2008, MNRAS, 383,627)
GCN Circular #9078
D. Malesani, J.P.U. Fynbo (DARK/NBI), J. Heidt (Heidelberg), T. Liimets (Tartu Observatory), T. Pursimo (NOT), and P. Jakobsson (Univ. Iceland), report on behalf of a larger collaboration:
We observed the optical afterglow of GRB 090401B (Schady et al., GCN 9066; Schady & Oates, GCN 9067), also detected by AGILE (Moretti et al., GCN 9069; Giuliani et al., GCN 9075). Observations were carried out in the R band with the Nordic Optical Telescope, starting on April 1.870 UT, 12.3 hr after the GRB.
In a single 300 s exposure, the afterglow is clearly detected, with a magnitude R ~ 22.2 +- 0.1, referred to USNO-B1 stars in the neighbourhood.
We acknowledge excellent support from the NOT visiting observers and staff.
GCN Circular #9079
K.Kono, K.Noda, E.Sonoda, N.Ohmori, H.hayasi, A.Daikyuji, Y.Nisioka, M.Yamauchi (University of Miyazaki)
We have observed the field covering the error circle of GRB090401B (Swift trigger 348152, GCN 9066, Schady et al.) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki. The observation was started 10:47:10 UT, about 1.8 hr after the Swift trigger time. We have compared our data of 30 sec exposures with the USNO-A2.0 catalog, There is no new source at the reported position. (GCN 9068, Stamatikos et al. GCN 9070, Osborne et al. )
```
the upper limits are as follows:
--------------------------------------------------------------
Start(UT)   End(UT)    Num. of frames    Limit (mag.)
--------------------------------------------------------------
11:41:47    11:42:17          1            16.8
11:41:47    12:32:21         43            17.7
---------------------------------------------------------------
```
GCN Circular #9080
D. Kuroda, M. Yoshida, K. Yanagisawa, Y. Shimizu, S. Nagayama, H. Toda (OAO, NAOJ) and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 090401B (Schady et al. GCN 9066) with optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory. We did not detect the optical afterglow reported by Schady and Oates (GCN 9067; GCN 9074). 3-sigma upper limits to our observation are listed below. We used GSC2.3 catalog for flux calibration.
```
       Mid-UT         T(s)   EXP(s)      g'      Rc     Ic
-------------------------------------------------------------
2009-04-01 10:43:51   7706     660     >18.2   >18.1  >17.6
-------------------------------------------------------------
```
GCN Circular #9081
Poonam Chandra (RMC) and Dale A. Frail (NRAO) report on behalf of the Caltech-NRAO-Carnegie GRB Collaboration:
"We used the Very Large Array to observe the field of view toward GRB 090401B (GCN 9066) at a frequency of 8.46 GHz on 2009 Apr. 02.15 UT. The GRB radio afterglow is undetected at the Swift-UVOT position (GCN 9067). The three-sigma flux density of the GRB afterglow at the Swift UVOT position is 138 uJy.
The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc."
GCN Circular #9082
S.M. Hu, L.P. Xin, W.K. Zheng, Y.L. Qiu, J.Y. Wei, j. Wang, J.S. Deng and J.Y. Hu on behalf of EAFON report:
We have observed GRB 090401B (Schady et al., GCN 9066; Schady & Oates, GCN 9067, GCN 9074) with Xinglong TNT telescope from Apr.1, 11:25:22(UT), 3.37 hr after the burst. After combined 9*300s R band images, no new source was found in our combined image. The 3 sigma upper limits was obtained to be R=19.9 mag at the mean time of 2.71 hr after the trigger, with the calibration to USNO-B1.0 R2 magnitude.
This message may be cited.
For more information about Xinglong GRBs Follow-up observations, please visit the website: http://www.xinglong-naoc.org/grb/
GCN Circular #9083
S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, report:
The long bright GRB 090401B (Swift-BAT trigger #348152: Schady et al., GCN 9066; Stamatikos et al., GCN 9068) triggered Konus-Wind at T0=30922.964 s UT (08:35:22.964).
The burst light curve shows a multipeaked structure with a duration of ~11 s. There is a hint of an extended soft emission.
As observed by Konus-Wind the burst had a fluence of 6.25(-0.75, +0.78)x10^-5 erg/cm2, and a 16-ms peak flux measured from T0+6.576 s of 4.63(-0.86, +0.87)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum of the burst (from T0 to T0+16.996 s) is well fitted (in the 20 keV - 10 MeV range) by GRB (Band) model for which: the low-energy photon index alpha = -0.78(-0.09, +0.11), the high energy photon index beta = -2.14(-0.23, +0.15), the peak energy Ep = 409(-60, +66) keV (chi2 = 61.8/85 dof).
All the quoted errors are at the 90% confidence level.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB090401_T30922/
GCN Circular #9084
M. Suzuki, M. Ohno, M. Kokubun, T. Takahashi (ISAS/JAXA), N. Kodaka, W. Iwakiri, M. Tashiro, Y. Terada, Y. Urata, A. Endo, K. Onda, K. Morigami, T. Sugasahara (Saitama U.), T. Enoto, K. Nakazawa, K. Makishima (Univ. of Tokyo), S. Sugita, K. Yamaoka (Aoyama Gakuin U.), Y. E. Nakagawa, T. Tamagawa (RIKEN), T. Uehara, T. Takahashi, Y. Fukazawa, C. Kira, Y. Hanabata (Hiroshima U.), E. Sonoda, M. Yamauchi, H. Tanaka, R. Hara, N. Ohmori, K. Kono, H. Hayashi (Univ. of Miyazaki), S. Hong (Nihon U.), N. Vasquez (Tokyo Tech.), on behalf of the Suzaku WAM team, report:
The bright long GRB 090401B (Swift/BAT trigger #348152; Schady et al. GCN 9066; Stamatikos et al., GCN 9068) triggered the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 08:35:24.504 UT (=T0).
The observed light curve shows a multi-peaked structure lasting from T0+0s to T0+10s with a duration (T90) of about 9 seconds. The fluence in 100 - 1000 keV was 2.56 (-0.11,+0.09) x 10^-5 erg/cm^2. The 1-s peak flux measured from T0+7s was 21.6 (-1.5,+1.3) photons/cm^2/s in the same energy range.
Preliminary result shows that the time-averaged spectrum from T0+0s to T0+10s is well fitted by a single power-law with a photon index of 2.22 (-0.09,+0.10) (chi^2/d.o.f = 24.9/25).
All the quoted errors are at statistical 90% confidence level, in which the systematic uncertainties are not included.
The light curves for this burst are available at: http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html
GCN Report 208.1
GCN_Report 208.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_208_1.pdf by P. Schady at MSSL-UCL titled: "Final Results on Swift GRB 090401B"

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Jochen Greiner, last update: 23-Apr-2009 [Disclaimer]