Gamma-ray Burst 090422

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 22 Apr 09 03:35:31 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     349931,   Seg_Num: 0
GRB_RA:          294.756d {+19h 39m 01s} (J2000),
                 294.835d {+19h 39m 20s} (current),
                 294.331d {+19h 37m 19s} (1950)
GRB_DEC:         +40.384d {+40d 23' 03"} (J2000),
                 +40.406d {+40d 24' 21"} (current),
                 +40.269d {+40d 16' 07"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       447 [cnts]    Image_Peak=52 [image_cnts]
TRIGGER_DUR:     0.064 [sec] 
TRIGGER_INDEX:   10418     E_range: 25-100 keV
BKG_INTEN:       31553 [cnts]
BKG_TIME:        12907.32 SOD {03:35:07.32} UT
BKG_DUR:         8 [sec]
GRB_DATE:        14943 TJD;   112 DOY;   09/04/22
GRB_TIME:        12916.60 SOD {03:35:16.60} UT
GRB_PHI:         -79.64 [deg]
GRB_THETA:        21.39 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     10.39 [sigma]
IMAGE_SIGNIF:    7.00 [sigma]
MERIT_PARAMS:     +1  +0  +0  -4  +2  -3  +0  +1  -7  +0 
SUN_POSTN:        29.97d {+01h 59m 52s}  +12.22d {+12d 13' 08"}
SUN_DIST:         85.95 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:      353.18d {+23h 32m 44s}   +1.13d {+01d 07' 58"}
MOON_DIST:        65.65 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       73.95,  8.96 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      310.24, 60.41 [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 = 58.80,20.34 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(1.0<100sec) coincident with the FERMI_GBM event (trignum=262064119).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 22 Apr 09 03:35:36 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     262064119
GRB_RA:          296.867d {+19h 47m 28s} (J2000),
                 296.952d {+19h 47m 49s} (current),
                 296.407d {+19h 45m 38s} (1950)
GRB_DEC:         +36.067d {+36d 03' 60"} (J2000),
                 +36.090d {+36d 05' 24"} (current),
                 +35.942d {+35d 56' 30"} (1950)
GRB_ERROR:       18.37 [deg radius, statistical plus systematic]
GRB_INTEN:       138 [cnts/sec]
DATA_SIGNIF:     5.00 [sigma]
INTEG_TIME:      0.512 [sec]
GRB_DATE:        14943 TJD;   112 DOY;   09/04/22
GRB_TIME:        12917.07 SOD {03:35:17.07} UT
GRB_PHI:          72.00 [deg]
GRB_THETA:        25.00 [deg]
DATA_TIME_SCALE: 0.5120 [sec]
HARD_RATIO:      0.73
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      57%  GRB
2nd_MOST_LIKELY:  15%  Cyg X-1
DETECTORS:       0,1,0, 0,0,0, 0,0,0, 1,0,0, 0,0,
SUN_POSTN:        29.97d {+01h 59m 52s}  +12.22d {+12d 13' 08"}
SUN_DIST:         85.23 [deg]   Sun_angle= 6.2 [hr] (West of Sun)
MOON_POSTN:      353.18d {+23h 32m 44s}   +1.13d {+01d 07' 59"}
MOON_DIST:        62.56 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       70.95,  5.41 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      310.52, 55.79 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 36.45,-23.27 [deg].

GCN NOTICE

TITLE:        GCN/SIMBAD_NED NOTICE
NOTICE_DATE:  Wed Apr 22 03:35:41 UTC 2009
NOTICE_TYPE:  Swift-BAT Position search
TRIGGER_NUM:  349931
RA:           294.7561 (J2000)
DEC:          40.3842 (J2000)
 
SIMBAD search for BAT_RA,Dec=294.7561,40.3842,radius=10.0arcmin
 
Num   RA         Dec                    Name                        Type  Num_Pub  Distance

 1 294.76114375  40.35936639                   HD 225303               IR   2      1.51
 2 294.76114375  40.35936639                   HD 225303               IR   2      1.51
 3 294.70494333  40.46664472                   HD 225302               IR   1      5.47
 4 294.64086125  40.32388861             TYC 3139-1882-1               IR   0      6.39
 5 294.69708875  40.26732861             TYC 3139-2294-1               IR   0      7.51
 6 294.75995833  40.25591667                  V* V935 Cyg              V*   6      7.70
 7 294.84775000  40.27202778                 Cl* NGC 6819              IR   1      7.93
 8 294.57750000  40.35166667             IRAS 19366+4014               IR   0      8.39
 9 294.85062500  40.26286111                 Cl* NGC 6819              IR   1      8.47
10 294.57958333  40.45611111             IRAS 19366+4020               IR   0      9.14
 
NED search for BAT_RA,Dec=294.7561,40.3842,radius=10.0arcmin
 
Num    RA           Dec       Name                           Type      Distance

 1   294.734875    40.382194  NVSS J193856+402255           , RadioS   1.00
 2   294.647875    40.281917  NVSS J193835+401654           , RadioS   7.90
 3   294.570417    40.386028  2MASXi J1938169+402310        , IrS      8.50
 4   294.896708    40.476833  NVSS J193935+402836           , RadioS   8.50

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 22 Apr 09 03:36:10 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     262064119
GRB_RA:          298.710d {+19h 54m 50s} (J2000),
                 298.779d {+19h 55m 07s} (current),
                 298.341d {+19h 53m 22s} (1950)
GRB_DEC:         +48.000d {+48d 00' 00"} (J2000),
                 +48.025d {+48d 01' 30"} (current),
                 +47.867d {+47d 52' 01"} (1950)
GRB_ERROR:       8.71 [deg radius, statistical only]
DATA_SIGNIF:     4.70 [sigma]
DATA_INTERVAL:   0.512 [sec]
GRB_DATE:        14943 TJD;   112 DOY;   09/04/22
GRB_TIME:        12917.07 SOD {03:35:17.07} UT
GRB_PHI:          72.00 [deg]
GRB_THETA:        37.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   1 (Gnd S/W Version number)
SUN_POSTN:        29.97d {+01h 59m 52s}  +12.22d {+12d 13' 08"}
SUN_DIST:         81.73 [deg]   Sun_angle= 6.1 [hr] (West of Sun)
MOON_POSTN:      353.19d {+23h 32m 45s}   +1.14d {+01d 08' 07"}
MOON_DIST:        66.18 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       82.09, 10.15 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      322.93, 66.24 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:        GCN/SIMBAD_NED NOTICE
NOTICE_DATE:  Wed Apr 22 03:36:51 UTC 2009
NOTICE_TYPE:  Swift-XRT Position search
TRIGGER_NUM:  349931
RA:           294.7489 (J2000)
DEC:          40.3863 (J2000)
 
SIMBAD search for XRT_RA,Dec=294.7489,40.3863,radius=1.0arcmin
 
Num   RA         Dec                    Name                        Type  Num_Pub  Distance

 
  
NED search for XRT_RA,Dec=294.7489,40.3863,radius=1.0arcmin
 
Num    RA           Dec       Name                           Type      Distance

 1   294.734875    40.382194  NVSS J193856+402255           , RadioS   0.70

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 22 Apr 09 03:36:58 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     349931,   Seg_Num: 0
GRB_RA:          294.7489d {+19h 39m 00.2s} (J2000),
                 294.8281d {+19h 39m 18.7s} (current),
                 294.3234d {+19h 37m 17.6s} (1950)
GRB_DEC:         +40.3863d {+40d 23' 10.6"} (J2000),
                 +40.4080d {+40d 24' 28.8"} (current),
                 +40.2707d {+40d 16' 14.4"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       24 [cnts]
IMG_START_DATE:  14943 TJD;   112 DOY;   09/04/22
IMG_START_TIME:  12980.60 SOD {03:36:20.60} UT,   64.0 [sec] since BAT Trigger Time
CENTROID_X:      280.82,  raw= 281  [pixels]
CENTROID_Y:      301.12,  raw= 301  [pixels]
ROLL:            77.29 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   7.37
GRB_POS_XRT_Z:   -50.61
IMAGE_URL:       sw00349931000msxps_rw.img
SUN_POSTN:        29.97d {+01h 59m 53s}  +12.22d {+12d 13' 09"}
SUN_DIST:         85.96 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:      353.19d {+23h 32m 46s}   +1.14d {+01d 08' 19"}
MOON_DIST:        65.66 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       73.94,  8.96 [deg] galactic lon,lat of the burst
ECL_COORDS:      310.23, 60.42 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 22 Apr 09 03:37:03 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     349931,   Seg_Num: 0
GRB_RA:          294.7489d {+19h 39m 00.2s} (J2000),
                 294.8281d {+19h 39m 18.7s} (current),
                 294.3234d {+19h 37m 17.6s} (1950)
GRB_DEC:         +40.3863d {+40d 23' 10.6"} (J2000),
                 +40.4080d {+40d 24' 28.8"} (current),
                 +40.2707d {+40d 16' 14.4"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       24 [cnts]
IMG_START_DATE:  14943 TJD;   112 DOY;   09/04/22
IMG_START_TIME:  12980.60 SOD {03:36:20.60} UT,   64.0 [sec] since BAT Trigger Time
CENTROID_X:      280.82,  raw= 281  [pixels]
CENTROID_Y:      301.12,  raw= 301  [pixels]
ROLL:            77.29 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   7.37
GRB_POS_XRT_Z:   -50.61
IMAGE_URL:       sw00349931000msxps_rw.img
SUN_POSTN:        29.97d {+01h 59m 53s}  +12.22d {+12d 13' 09"}
SUN_DIST:         85.96 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:      353.19d {+23h 32m 47s}   +1.14d {+01d 08' 20"}
MOON_DIST:        65.66 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       73.94,  8.96 [deg] galactic lon,lat of the burst
ECL_COORDS:      310.23, 60.42 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 22 Apr 09 03:39:01 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     349931,   Seg_Num: 0
GRB_RA:          294.756d {+19h 39m 01s} (J2000),
                 294.835d {+19h 39m 20s} (current),
                 294.331d {+19h 37m 19s} (1950)
GRB_DEC:         +40.384d {+40d 23' 03"} (J2000),
                 +40.406d {+40d 24' 21"} (current),
                 +40.269d {+40d 16' 07"} (1950)
GRB_DATE:        14943 TJD;   112 DOY;   09/04/22
GRB_TIME:        12916.76 SOD {03:35:16.76} UT
TRIGGER_INDEX:   10418
GRB_PHI:         -79.64 [deg]
GRB_THETA:        21.39 [deg]
DELTA_TIME:      15.00 [sec]
TRIGGER_DUR:     0.064 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.39 [sigma]
IMAGE_SIGNIF:    7.00 [sigma]
LC_URL:          sw00349931000msb.lc
SUN_POSTN:        29.97d {+01h 59m 53s}  +12.22d {+12d 13' 11"}
SUN_DIST:         85.95 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:      353.21d {+23h 32m 50s}   +1.15d {+01d 08' 49"}
MOON_DIST:        65.66 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       73.95,  8.96 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      310.24, 60.41 [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 = 58.80,20.34 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 22 Apr 09 03:36:47 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     349931,   Seg_Num: 0
GRB_RA:          294.7489d {+19h 39m 00.26s} (J2000),
                 294.8281d {+19h 39m 18.74s} (current),
                 294.3234d {+19h 37m 17.61s} (1950)
GRB_DEC:         +40.3863d {+40d 23' 10.6"} (J2000),
                 +40.4080d {+40d 24' 28.8"} (current),
                 +40.2707d {+40d 16' 14.4"} (1950)
GRB_ERROR:       6.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       5.51e-10 [erg/cm2/sec]
GRB_SIGNIF:      4.89 [sigma]
IMG_START_DATE:  14943 TJD;   112 DOY;   09/04/22
IMG_START_TIME:  12980.60 SOD {03:36:20.60} UT,   64.0 [sec] since BAT Trigger Time
TAM[0-3]:        327.63 237.23 261.53 243.60
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        29.97d {+01h 59m 52s}  +12.22d {+12d 13' 09"}
SUN_DIST:         85.96 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:      353.19d {+23h 32m 46s}   +1.14d {+01d 08' 16"}
MOON_DIST:        65.66 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       73.94,  8.96 [deg] galactic lon,lat of the burst
ECL_COORDS:      310.23, 60.42 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.35 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 22 Apr 09 03:39:52 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     349931,   Seg_Num: 0
POINT_RA:        294.733d {+19h 38m 56s} (J2000)
POINT_DEC:       +40.381d {+40d 22' 52"} (J2000)
POINT_ROLL:      77.293d
IMG_START_DATE:  14943 TJD;   112 DOY;   09/04/22
IMG_START_TIME:  12990.99 SOD {03:36:30.99} UT,   74.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.362
N_STARS:         190
X_OFFSET:        572 [pixels]
Y_OFFSET:        486 [pixels]
X_MAX:           1531 [pixels]
Y_MAX:           1445 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00349931000msufc0074.fits
SUN_POSTN:        29.97d {+01h 59m 53s}  +12.22d {+12d 13' 11"}
SUN_DIST:         85.97 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:      353.22d {+23h 32m 52s}   +1.15d {+01d 09' 02"}
MOON_DIST:        65.68 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       73.93,  8.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.20, 60.41 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 22 Apr 09 03:40:27 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     349931,   Seg_Num: 0
POINT_RA:        294.733d {+19h 38m 56s} (J2000)
POINT_DEC:       +40.381d {+40d 22' 52"} (J2000)
POINT_ROLL:      77.293d
IMG_START_DATE:  14943 TJD;   112 DOY;   09/04/22
IMG_START_TIME:  12990.99 SOD {03:36:30.99} UT,   74.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.362
N_STARS:         190
X_OFFSET:        572 [pixels]
Y_OFFSET:        486 [pixels]
X_MAX:           1531 [pixels]
Y_MAX:           1445 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00349931000msufc0074.fits
SUN_POSTN:        29.97d {+01h 59m 53s}  +12.22d {+12d 13' 12"}
SUN_DIST:         85.97 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:      353.22d {+23h 32m 53s}   +1.15d {+01d 09' 10"}
MOON_DIST:        65.68 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       73.93,  8.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.20, 60.41 [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 22 Apr 09 03:41:34 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     349931,   Seg_Num: 0
POINT_RA:        294.733d {+19h 38m 56s} (J2000)
POINT_DEC:       +40.381d {+40d 22' 52"} (J2000)
ROLL:            77.293d
IMG_START_DATE:  14943 TJD;   112 DOY;   09/04/22
IMG_START_TIME:  12990.99 SOD {03:36:30.99} UT,   74.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     262064195
X_OFFSET:        892 [pixels]
Y_OFFSET:        806 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1052
Y_GRB_POS:       966
BINNING_INDEX:   1
IM_URL:          sw00349931000msuni0079.fits
SUN_POSTN:        29.97d {+01h 59m 53s}  +12.22d {+12d 13' 13"}
SUN_DIST:         85.97 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:      353.23d {+23h 32m 55s}   +1.16d {+01d 09' 27"}
MOON_DIST:        65.68 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       73.93,  8.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.20, 60.41 [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 22 Apr 09 03:42:02 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     349931,   Seg_Num: 0
POINT_RA:        294.733d {+19h 38m 56s} (J2000)
POINT_DEC:       +40.381d {+40d 22' 52"} (J2000)
ROLL:            77.293d
IMG_START_DATE:  14943 TJD;   112 DOY;   09/04/22
IMG_START_TIME:  12990.99 SOD {03:36:30.99} UT,   74.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     262064195
X_OFFSET:        892 [pixels]
Y_OFFSET:        806 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1052
Y_GRB_POS:       966
BINNING_INDEX:   1
IM_URL:          sw00349931000msuni0079.fits
SUN_POSTN:        29.97d {+01h 59m 53s}  +12.22d {+12d 13' 13"}
SUN_DIST:         85.97 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:      353.23d {+23h 32m 56s}   +1.16d {+01d 09' 33"}
MOON_DIST:        65.68 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       73.93,  8.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.20, 60.41 [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/SIMBAD_NED NOTICE
NOTICE_DATE:  Wed Apr 22 03:45:12 UTC 2009
NOTICE_TYPE:  Swift-XRT Position search
TRIGGER_NUM:  349931
RA:           294.7493 (J2000)
DEC:          40.3853 (J2000)
 
SIMBAD search for XRT_RA,Dec=294.7493,40.3853,radius=1.0arcmin
 
Num   RA         Dec                    Name                        Type  Num_Pub  Distance

 

NED search for XRT_RA,Dec=294.7493,40.3853,radius=1.0arcmin
 
Num    RA           Dec       Name                           Type      Distance

 1   294.734875    40.382194  NVSS J193856+402255           , RadioS   0.70

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 22 Apr 09 03:45:08 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     349931,   Seg_Num: 0
GRB_RA:          294.7493d {+19h 39m 00.16s} (J2000),
                 294.8285d {+19h 39m 18.84s} (current),
                 294.3238d {+19h 37m 17.70s} (1950)
GRB_DEC:         +40.3853d {+40d 23' 07.0"} (J2000),
                 +40.4070d {+40d 24' 25.2"} (current),
                 +40.2697d {+40d 16' 10.8"} (1950)
GRB_ERROR:       3.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  14943 TJD;   112 DOY;   09/04/22
IMG_START_TIME:  13006.00 SOD {03:36:46.00} UT,   89.4 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        29.97d {+01h 59m 54s}  +12.22d {+12d 13' 16"}
SUN_DIST:         85.96 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:      353.26d {+23h 33m 02s}   +1.17d {+01d 10' 19"}
MOON_DIST:        65.68 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       73.94,  8.96 [deg] galactic lon,lat of the burst
ECL_COORDS:      310.23, 60.41 [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.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 22 Apr 09 03:47:54 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     349931,   Seg_Num: 0
POINT_RA:        294.728d {+19h 38m 55s} (J2000)
POINT_DEC:       +40.381d {+40d 22' 51"} (J2000)
POINT_ROLL:      77.289d
IMG_START_DATE:  14943 TJD;   112 DOY;   09/04/22
IMG_START_TIME:  13203.51 SOD {03:40:03.51} UT,   286.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.598
N_STARS:         159
X_OFFSET:        572 [pixels]
Y_OFFSET:        486 [pixels]
X_MAX:           1531 [pixels]
Y_MAX:           1445 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00349931000msufc0286.fits
SUN_POSTN:        29.98d {+01h 59m 54s}  +12.22d {+12d 13' 18"}
SUN_DIST:         85.98 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:      353.28d {+23h 33m 08s}   +1.18d {+01d 10' 60"}
MOON_DIST:        65.70 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       73.93,  8.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.20, 60.42 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 22 Apr 09 03:48:26 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     349931,   Seg_Num: 0
POINT_RA:        294.728d {+19h 38m 55s} (J2000)
POINT_DEC:       +40.381d {+40d 22' 51"} (J2000)
POINT_ROLL:      77.289d
IMG_START_DATE:  14943 TJD;   112 DOY;   09/04/22
IMG_START_TIME:  13203.51 SOD {03:40:03.51} UT,   286.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.598
N_STARS:         159
X_OFFSET:        572 [pixels]
Y_OFFSET:        486 [pixels]
X_MAX:           1531 [pixels]
Y_MAX:           1445 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00349931000msufc0286.fits
SUN_POSTN:        29.98d {+01h 59m 54s}  +12.22d {+12d 13' 18"}
SUN_DIST:         85.98 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:      353.29d {+23h 33m 09s}   +1.19d {+01d 11' 07"}
MOON_DIST:        65.70 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:       73.93,  8.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.20, 60.42 [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 22 Apr 09 03:49:40 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     349931,   Seg_Num: 0
POINT_RA:        294.728d {+19h 38m 55s} (J2000)
POINT_DEC:       +40.381d {+40d 22' 51"} (J2000)
ROLL:            77.289d
IMG_START_DATE:  14943 TJD;   112 DOY;   09/04/22
IMG_START_TIME:  13203.51 SOD {03:40:03.51} UT,   286.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     262064408
X_OFFSET:        892 [pixels]
Y_OFFSET:        806 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1052
Y_GRB_POS:       966
BINNING_INDEX:   1
IM_URL:          sw00349931000msuni0291.fits
SUN_POSTN:        29.98d {+01h 59m 54s}  +12.22d {+12d 13' 19"}
SUN_DIST:         85.98 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:      353.30d {+23h 33m 11s}   +1.19d {+01d 11' 26"}
MOON_DIST:        65.71 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:       73.93,  8.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.20, 60.42 [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:     Wed 22 Apr 09 03:49:15 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     349931,   Seg_Num: 0
POINT_RA:        294.728d {+19h 38m 55s} (J2000)
POINT_DEC:       +40.381d {+40d 22' 51"} (J2000)
ROLL:            77.289d
IMG_START_DATE:  14943 TJD;   112 DOY;   09/04/22
IMG_START_TIME:  13203.51 SOD {03:40:03.51} UT,   286.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     262064408
X_OFFSET:        892 [pixels]
Y_OFFSET:        806 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1052
Y_GRB_POS:       966
BINNING_INDEX:   1
IM_URL:          sw00349931000msuni0291.fits
SUN_POSTN:        29.98d {+01h 59m 54s}  +12.22d {+12d 13' 19"}
SUN_DIST:         85.98 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:      353.29d {+23h 33m 10s}   +1.19d {+01d 11' 20"}
MOON_DIST:        65.71 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:       73.93,  8.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.20, 60.42 [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 22 Apr 09 03:53:45 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     349931,   Seg_Num: 0
POINT_RA:        294.728d {+19h 38m 55s} (J2000)
POINT_DEC:       +40.381d {+40d 22' 50"} (J2000)
POINT_ROLL:      77.290d
IMG_START_DATE:  14943 TJD;   112 DOY;   09/04/22
IMG_START_TIME:  13781.36 SOD {03:49:41.36} UT,   864.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.675
N_STARS:         190
X_OFFSET:        332 [pixels]
Y_OFFSET:        246 [pixels]
X_MAX:           1771 [pixels]
Y_MAX:           1685 [pixels]
DET_THRESH:      20
PHOTO_THRESH:    12
SL_URL:          sw00349931000msufc0864.fits
SUN_POSTN:        29.98d {+01h 59m 55s}  +12.22d {+12d 13' 23"}
SUN_DIST:         85.98 [deg]   Sun_angle= 6.4 [hr] (West of Sun)
MOON_POSTN:      353.33d {+23h 33m 19s}   +1.21d {+01d 12' 26"}
MOON_DIST:        65.72 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:       73.93,  8.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.20, 60.42 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 22 Apr 09 03:54:23 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     349931,   Seg_Num: 0
POINT_RA:        294.728d {+19h 38m 55s} (J2000)
POINT_DEC:       +40.381d {+40d 22' 50"} (J2000)
POINT_ROLL:      77.290d
IMG_START_DATE:  14943 TJD;   112 DOY;   09/04/22
IMG_START_TIME:  13781.36 SOD {03:49:41.36} UT,   864.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.675
N_STARS:         190
X_OFFSET:        332 [pixels]
Y_OFFSET:        246 [pixels]
X_MAX:           1771 [pixels]
Y_MAX:           1685 [pixels]
DET_THRESH:      20
PHOTO_THRESH:    12
SL_URL:          sw00349931000msufc0864.fits
SUN_POSTN:        29.98d {+01h 59m 55s}  +12.22d {+12d 13' 23"}
SUN_DIST:         85.98 [deg]   Sun_angle= 6.4 [hr] (West of Sun)
MOON_POSTN:      353.34d {+23h 33m 20s}   +1.21d {+01d 12' 35"}
MOON_DIST:        65.72 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:       73.93,  8.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.20, 60.42 [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 22 Apr 09 03:39:52 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     349931,   Seg_Num: 0
POINT_RA:        294.733d {+19h 38m 56s} (J2000)
POINT_DEC:       +40.381d {+40d 22' 52"} (J2000)
POINT_ROLL:      77.293d
IMG_START_DATE:  14943 TJD;   112 DOY;   09/04/22
IMG_START_TIME:  12990.99 SOD {03:36:30.99} UT,   74.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.362
N_STARS:         190
X_OFFSET:        572 [pixels]
Y_OFFSET:        486 [pixels]
X_MAX:           1531 [pixels]
Y_MAX:           1445 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00349931000msufc0074.fits
SUN_POSTN:        29.97d {+01h 59m 53s}  +12.22d {+12d 13' 11"}
SUN_DIST:         85.97 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:      353.22d {+23h 32m 52s}   +1.15d {+01d 09' 02"}
MOON_DIST:        65.68 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       73.93,  8.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.20, 60.41 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 22 Apr 09 03:56:01 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     349931,   Seg_Num: 0
POINT_RA:        294.728d {+19h 38m 55s} (J2000)
POINT_DEC:       +40.381d {+40d 22' 50"} (J2000)
ROLL:            77.290d
IMG_START_DATE:  14943 TJD;   112 DOY;   09/04/22
IMG_START_TIME:  13781.36 SOD {03:49:41.36} UT,   864.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     262064986
X_OFFSET:        891 [pixels]
Y_OFFSET:        805 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1051
Y_GRB_POS:       965
BINNING_INDEX:   1
IM_URL:          sw00349931000msuni0869.fits
SUN_POSTN:        29.98d {+01h 59m 55s}  +12.22d {+12d 13' 25"}
SUN_DIST:         85.98 [deg]   Sun_angle= 6.4 [hr] (West of Sun)
MOON_POSTN:      353.35d {+23h 33m 24s}   +1.22d {+01d 12' 59"}
MOON_DIST:        65.73 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:       73.93,  8.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.20, 60.42 [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 22 Apr 09 03:56:26 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     349931,   Seg_Num: 0
POINT_RA:        294.728d {+19h 38m 55s} (J2000)
POINT_DEC:       +40.381d {+40d 22' 50"} (J2000)
ROLL:            77.290d
IMG_START_DATE:  14943 TJD;   112 DOY;   09/04/22
IMG_START_TIME:  13781.36 SOD {03:49:41.36} UT,   864.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     262064986
X_OFFSET:        891 [pixels]
Y_OFFSET:        805 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1051
Y_GRB_POS:       965
BINNING_INDEX:   1
IM_URL:          sw00349931000msuni0869.fits
SUN_POSTN:        29.98d {+01h 59m 56s}  +12.22d {+12d 13' 25"}
SUN_DIST:         85.98 [deg]   Sun_angle= 6.4 [hr] (West of Sun)
MOON_POSTN:      353.35d {+23h 33m 24s}   +1.22d {+01d 13' 05"}
MOON_DIST:        65.73 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:       73.93,  8.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.20, 60.42 [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 #9185
T. N. Ukwatta (GSFC/GWU), S. D. Barthelmy (GSFC), N. Gehrels (NASA/GSFC), J. A. Kennea (PSU), D. M. Palmer (LANL), M. Perri (ASDC), G. Stratta (ASDC) and L. Vetere (PSU) report on behalf of the Swift Team:
At 03:35:16 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 090422 (trigger=349931). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 294.756, +40.384 which is
```
   RA(J2000) = 19h 39m 01s
   Dec(J2000) = +40d 23' 03"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows two spikes with a total duration of about 10 sec. The peak count rate was ~3500 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 03:36:20.6 UT, 64.0 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source located at RA, Dec 294.74931, 40.38530 which is equivalent to:
```
   RA(J2000)  = 19h 38m 59.83s
   Dec(J2000) = +40d 23' 07.1"
```
with an uncertainty of 3.9 arcseconds (radius, 90% containment). This location is 18 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 1.65e+21 cm^-2 (Kalberla et al. 2005).
The initial flux in the 2.5 s image was 5.51e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 74 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 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 0.20.
Burst Advocate for this burst is T. N. Ukwatta (tilan.ukwatta AT gmail.com). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 22 Apr 09 03:47:54 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     349931,   Seg_Num: 0
POINT_RA:        294.728d {+19h 38m 55s} (J2000)
POINT_DEC:       +40.381d {+40d 22' 51"} (J2000)
POINT_ROLL:      77.289d
IMG_START_DATE:  14943 TJD;   112 DOY;   09/04/22
IMG_START_TIME:  13203.51 SOD {03:40:03.51} UT,   286.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.598
N_STARS:         159
X_OFFSET:        572 [pixels]
Y_OFFSET:        486 [pixels]
X_MAX:           1531 [pixels]
Y_MAX:           1445 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00349931000msufc0286.fits
SUN_POSTN:        29.98d {+01h 59m 54s}  +12.22d {+12d 13' 18"}
SUN_DIST:         85.98 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:      353.28d {+23h 33m 08s}   +1.18d {+01d 10' 60"}
MOON_DIST:        65.70 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       73.93,  8.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.20, 60.42 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 22 Apr 09 03:53:45 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     349931,   Seg_Num: 0
POINT_RA:        294.728d {+19h 38m 55s} (J2000)
POINT_DEC:       +40.381d {+40d 22' 50"} (J2000)
POINT_ROLL:      77.290d
IMG_START_DATE:  14943 TJD;   112 DOY;   09/04/22
IMG_START_TIME:  13781.36 SOD {03:49:41.36} UT,   864.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.675
N_STARS:         190
X_OFFSET:        332 [pixels]
Y_OFFSET:        246 [pixels]
X_MAX:           1771 [pixels]
Y_MAX:           1685 [pixels]
DET_THRESH:      20
PHOTO_THRESH:    12
SL_URL:          sw00349931000msufc0864.fits
SUN_POSTN:        29.98d {+01h 59m 55s}  +12.22d {+12d 13' 23"}
SUN_DIST:         85.98 [deg]   Sun_angle= 6.4 [hr] (West of Sun)
MOON_POSTN:      353.33d {+23h 33m 19s}   +1.21d {+01d 12' 26"}
MOON_DIST:        65.72 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:       73.93,  8.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.20, 60.42 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN Circular #9187
C. Guidorzi (U. Ferrara), D. Bersier, A. Melandri, C.J. Mottram, C.G. Mundell, R.J. Smith, I.A. Steele (Liverpool JMU) on behalf of a large collaboration report:
On 2009 April 22 at 03:37:40 UT the 2-m Liverpool Telescope robotically reacted and began observing the Swift GRB 090422 (Ukwatta et al., GCN Circ. 9185) using the r',i', and z' filters, corresponding to 2.40 min after the BAT trigger time.
Inside the revised XRT error circle we detect a single object of r' ~ 19 mag, which is already present in the DSS archive images and shows no significant fading from 10 min to 1 hr post burst.
GCN Circular #9194
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 6291 s of XRT Photon Counting mode data and 8 UVOT images for GRB 090422, 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 = 294.74967, +40.38445 which is equivalent to:
```
RA (J2000): 19h 38m 59.92s
Dec (J2000): +40d 23' 04.0"
```
with an uncertainty of 1.5 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, arXiv:0812.3662).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #9195
C. B. Markwardt (GSFC/UMD), 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), 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 090422 (trigger #349931) (Ukwatta, et al., GCN Circ. 9185). The BAT ground-calculated position is RA, Dec = 294.746, 40.398 deg which is
```
   RA(J2000)  =  19h 38m 59.1s 
   Dec(J2000) = +40d 23' 52.1" 
```
with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 72%.
The mask-weighted light curve shows two main peaks at T0 and T+8 sec. They are each about 1 sec wide. There is a third, weaker peat at ~T=50 sec. T90 (15-350 keV) is 8.5 +- 0.4 sec (estimated error including systematics).
The time-averaged spectrum from T-0.4 to T+8.5 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.72 +- 0.30. The fluence in the 15-150 keV band is 2.3 +- 0.4 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-0.37 sec in the 15-150 keV band is 1.7 +- 0.2 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/349931/BA/
GCN Circular #9197
C. Guidorzi (U. Ferrara), D. Bersier, C.G. Mundell (Liverpool JMU) on behalf of a large collaboration report:
Following the distribution of the enhanced Swift-XRT position (Beardmore et al. GCN Circ. 9194) of GRB 090422 (Ukwatta et al. GCN Circ. 9185), we re-analysed the data acquired with the Liverpool Telescope, mentioned in our previous report (Guidorzi et al. GCN Circ. 9187).
Inside the enhanced XRT error circle we detect a single object with magnitude of (21.7 +/- 0.3) in the r' filter, from 11 to 43 min post burst, at the following position (J2000):
```
RA=   19:38:59.91
Decl= +40:23:03.5
```
with an uncertainty of 0.7 arcsec. The calibration was done with respect to nearby USNOB-1 stars, using the R2 magnitudes values. This source is also detected in i' and z' filters. At the moment we cannot assess whether the object is fading. The source of r'~19 mag mentioned in our earlier report lies outside the enhanced XRT error circle. Further observations are planned.
GCN Circular #9203
A. A. Breeveld (MSSL/UCL) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift UVOT team:
The Swift/UVOT observed the field of GRB 090422 starting 55 s after the BAT trigger (Ukwatta, et al., 2009, GCN Circ. 9185). Settled exposures started at T+74 s with a Finding Chart (FC) in the white filter. We do not find any new source, at the enhanced position of the XRT afterglow (Beardmore, et al. 2009, GCN Circ. 9194) nor at the position of the candidate found by the Liverpool Telescope (Guidorzi, et al. 2009, GCN Circ. 9197). 3-sigma upper limits for detecting a source in the white and u FCs, and subsequent co-added images in all filters are:
```
Filter           T_start   T_stop   Exp(s)      Mag
----------------------------------------------------------
white (FC)  74           224       147         >20.5
u (FC)          287        537        246        >19.6		

v                  617         11744   1317      >20.3
b                  542         18318   1145     >20.8
u                  690         24099   2059     >20.8
uvw1          666          23300   2203     >21.0
uvm2          641          22393   2092     >20.8
uvw2          592          10831   1318     >20.8
white          566          5591     341.4    >20.8
---------------------------------------------------------
```
The quoted upper limits have not been corrected for the expected Galactic extinction along the line of sight corresponding to a reddening of E_{B-V} = 0.198 mag (Schlegel, et al., 1998, ApJS, 500, 525). All photometry is on the UVOT photometry system described in Poole et al. (2008, MNRAS, 383, 627).
GCN Circular #9208
M. Perri and G. Stratta (ASDC) report on behalf of the Swift-XRT Team:
We have analysed the first 31 ks of Swift-XRT data obtained from GRB 090422 (trigger 349931; Ukwatta et al., GCN Circ. 9185), starting from T+70 s and ending at T+70 ks.
The best position of the X-ray afterglow is the UVOT-enhanced XRT position given in Beardmore et al. (GCN Circ. 9194).
The 0.3-10 keV X-ray light curve is well described by a double broken power-law model with decay indices alpha1=-1.7+/-0.2, alpha2=-0.2+/-0.3, alpha3=-1.0+/-0.1 and temporal breaks t1=421+/-92 s and t2=1.5+/-0.3 ks .
The X-ray spectrum is well fit by an absorbed power-law model with a photon index of 2.5+/-0.2 and a column density of (2.3+/-0.7)e21 cm**-2 in excess to the Galactic one in the direction of the source (1.7e21 cm**-2, Kalberla et al. 2005). The count-rate to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.6(8.7)E-11 erg cm**-2 count**-1.
Assuming the X-ray emission continues to decline at the same rate, we predict a 0.3-10 keV XRT count rate of 2e-3 count/s at T+48hr, which corresponds to an observed 0.3-10 keV flux of ~7e-14 erg/cm**2/s.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00349931.
This circular is an official product of the Swift-XRT team.
GCN Circular #9228
Sheila McBreen (UCD/MPE) reports on behalf of the Fermi GBM Team:
"At 03:35:17.07 UT on 22 April 2009, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 090422 (trigger 262064119 / 090422150) which was also detected by the Swift-BAT (Ukwatta et al. 2009, GCN 9185 & Markwardt et al. 2009, GCN 9195). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 29 degrees.
The GBM light curve consists of 2 pulses with a duration (T90) of about 10 s (8-1000 keV). The time-averaged spectrum from T0-2.4 s to T0+10.8 s is adequately fit by a simple power law function with index 1.81 +/- 0.15 (chi squared 358 for 361 d.o.f.).
The event fluence (8-1000 keV) in this time interval is (1.0 +/- 0.1)E-6 erg/cm^2. The 0.128 sec peak photon flux measured starting from T0-0.256 s in the 8-1000 keV band is 7.8 +/- 0.5 ph/s/cm^2.
GCN Report 214.1
GCN_Report 214.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_214_1.pdf by T. Ukwatta at GSFC/GWU titled: "Final Results on Swift GRB 090422"

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Jochen Greiner, last update: 08-May-2009 [Disclaimer]