Gamma-ray Burst 220611A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 11 Jun 22 18:02:55 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1110090,   Seg_Num: 0
GRB_RA:           66.526d {+04h 26m 06s} (J2000),
                  66.727d {+04h 26m 54s} (current),
                  66.080d {+04h 24m 19s} (1950)
GRB_DEC:         -37.289d {-37d 17' 20"} (J2000),
                 -37.240d {-37d 14' 22"} (current),
                 -37.401d {-37d 24' 03"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       16405 [cnts]    Image_Peak=351 [image_cnts]
TRIGGER_DUR:     8.192 [sec] 
TRIGGER_INDEX:   477     E_range: 25-100 keV
BKG_INTEN:       117830 [cnts]
BKG_TIME:        64818.69 SOD {18:00:18.69} UT
BKG_DUR:         64 [sec]
GRB_DATE:        19741 TJD;   162 DOY;   22/06/11
GRB_TIME:        64911.17 SOD {18:01:51.17} UT
GRB_PHI:           6.52 [deg]
GRB_THETA:        31.17 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     8.42 [sigma]
IMAGE_SIGNIF:    7.49 [sigma]
MERIT_PARAMS:     +1  +0  +0  +3  +2  -2  +0  +0 -47  +0 
SUN_POSTN:        79.99d {+05h 19m 58s}  +23.12d {+23d 07' 00"}
SUN_DIST:         61.64 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      220.49d {+14h 41m 58s}  -14.91d {-14d 54' 29"}
MOON_DIST:       122.30 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      239.77,-44.09 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       53.52,-57.79 [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 = 273.47,20.49 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 11 Jun 22 18:04:35 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     1110090,   Seg_Num: 0
POINT_RA:         66.564d {+04h 26m 15s} (J2000)
POINT_DEC:       -37.264d {-37d 15' 48"} (J2000)
IMG_START_DATE:  19741 TJD;   162 DOY;   22/06/11
IMG_START_TIME:  65060.42 SOD {18:04:20.42} UT,   149.2 [sec] since BAT Trigger Time
COUNTS:          2    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        1    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 11 Jun 22 18:08:51 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1110090,   Seg_Num: 0
POINT_RA:         66.564d {+04h 26m 15s} (J2000)
POINT_DEC:       -37.263d {-37d 15' 47"} (J2000)
POINT_ROLL:      14.024d
IMG_START_DATE:  19741 TJD;   162 DOY;   22/06/11
IMG_START_TIME:  65063.77 SOD {18:04:23.77} UT,   152.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        6.476
N_STARS:         14
X_OFFSET:        195 [pixels]
Y_OFFSET:        533 [pixels]
X_MAX:           1154 [pixels]
Y_MAX:           1492 [pixels]
DET_THRESH:      22
PHOTO_THRESH:    13
SL_URL:          sw01110090000msufc0152.fits
SUN_POSTN:        80.00d {+05h 19m 59s}  +23.12d {+23d 07' 01"}
SUN_DIST:         61.60 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      220.55d {+14h 42m 11s}  -14.93d {-14d 55' 52"}
MOON_DIST:       122.31 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      239.73,-44.06 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       53.58,-57.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 11 Jun 22 18:08:59 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1110090,   Seg_Num: 0
POINT_RA:         66.564d {+04h 26m 15s} (J2000)
POINT_DEC:       -37.263d {-37d 15' 47"} (J2000)
POINT_ROLL:      14.024d
IMG_START_DATE:  19741 TJD;   162 DOY;   22/06/11
IMG_START_TIME:  65063.77 SOD {18:04:23.77} UT,   152.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        6.476
N_STARS:         14
X_OFFSET:        195 [pixels]
Y_OFFSET:        533 [pixels]
X_MAX:           1154 [pixels]
Y_MAX:           1492 [pixels]
DET_THRESH:      22
PHOTO_THRESH:    13
SL_URL:          sw01110090000msufc0152.fits
SUN_POSTN:        80.00d {+05h 19m 59s}  +23.12d {+23d 07' 01"}
SUN_DIST:         61.61 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      220.55d {+14h 42m 12s}  -14.93d {-14d 55' 53"}
MOON_DIST:       122.31 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      239.73,-44.06 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       53.58,-57.78 [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:     Sat 11 Jun 22 18:10:41 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1110090,   Seg_Num: 0
POINT_RA:         66.564d {+04h 26m 15s} (J2000)
POINT_DEC:       -37.263d {-37d 15' 47"} (J2000)
ROLL:            14.024d
IMG_START_DATE:  19741 TJD;   162 DOY;   22/06/11
IMG_START_TIME:  65063.77 SOD {18:04:23.77} UT,   152.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     676663493
X_OFFSET:        514 [pixels]
Y_OFFSET:        852 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       674
Y_GRB_POS:       1012
BINNING_INDEX:   1
IM_URL:          sw01110090000msuni0182.fits
SUN_POSTN:        80.00d {+05h 19m 59s}  +23.12d {+23d 07' 01"}
SUN_DIST:         61.61 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      220.57d {+14h 42m 16s}  -14.94d {-14d 56' 17"}
MOON_DIST:       122.31 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      239.73,-44.06 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       53.58,-57.78 [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:     Sat 11 Jun 22 18:10:48 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1110090,   Seg_Num: 0
POINT_RA:         66.564d {+04h 26m 15s} (J2000)
POINT_DEC:       -37.263d {-37d 15' 47"} (J2000)
ROLL:            14.024d
IMG_START_DATE:  19741 TJD;   162 DOY;   22/06/11
IMG_START_TIME:  65063.77 SOD {18:04:23.77} UT,   152.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     676663493
X_OFFSET:        514 [pixels]
Y_OFFSET:        852 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       674
Y_GRB_POS:       1012
BINNING_INDEX:   1
IM_URL:          sw01110090000msuni0182.fits
SUN_POSTN:        80.00d {+05h 19m 59s}  +23.12d {+23d 07' 01"}
SUN_DIST:         61.61 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      220.57d {+14h 42m 16s}  -14.94d {-14d 56' 19"}
MOON_DIST:       122.31 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      239.73,-44.06 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       53.58,-57.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 11 Jun 22 18:16:10 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1110090,   Seg_Num: 0
POINT_RA:         66.563d {+04h 26m 15s} (J2000)
POINT_DEC:       -37.263d {-37d 15' 45"} (J2000)
POINT_ROLL:      14.025d
IMG_START_DATE:  19741 TJD;   162 DOY;   22/06/11
IMG_START_TIME:  65221.93 SOD {18:07:01.93} UT,   310.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.184
N_STARS:         116
X_OFFSET:        0 [pixels]
Y_OFFSET:        293 [pixels]
X_MAX:           1439 [pixels]
Y_MAX:           1732 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw01110090000msufc0310.fits
SUN_POSTN:        80.00d {+05h 20m 00s}  +23.12d {+23d 07' 02"}
SUN_DIST:         61.61 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      220.62d {+14h 42m 28s}  -14.96d {-14d 57' 34"}
MOON_DIST:       122.31 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      239.73,-44.06 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       53.58,-57.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 11 Jun 22 18:16:43 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1110090,   Seg_Num: 0
POINT_RA:         66.563d {+04h 26m 15s} (J2000)
POINT_DEC:       -37.263d {-37d 15' 45"} (J2000)
ROLL:            14.025d
IMG_START_DATE:  19741 TJD;   162 DOY;   22/06/11
IMG_START_TIME:  65221.93 SOD {18:07:01.93} UT,   310.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     676663651
X_OFFSET:        559 [pixels]
Y_OFFSET:        852 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       719
Y_GRB_POS:       1012
BINNING_INDEX:   1
IM_URL:          sw01110090000msuni0340.fits
SUN_POSTN:        80.00d {+05h 20m 00s}  +23.12d {+23d 07' 02"}
SUN_DIST:         61.61 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      220.62d {+14h 42m 30s}  -14.96d {-14d 57' 41"}
MOON_DIST:       122.31 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      239.73,-44.06 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       53.58,-57.78 [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:     Sat 11 Jun 22 18:16:53 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1110090,   Seg_Num: 0
POINT_RA:         66.563d {+04h 26m 15s} (J2000)
POINT_DEC:       -37.263d {-37d 15' 45"} (J2000)
ROLL:            14.025d
IMG_START_DATE:  19741 TJD;   162 DOY;   22/06/11
IMG_START_TIME:  65221.93 SOD {18:07:01.93} UT,   310.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     676663651
X_OFFSET:        559 [pixels]
Y_OFFSET:        852 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       719
Y_GRB_POS:       1012
BINNING_INDEX:   1
IM_URL:          sw01110090000msuni0340.fits
SUN_POSTN:        80.00d {+05h 20m 00s}  +23.12d {+23d 07' 02"}
SUN_DIST:         61.61 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      220.62d {+14h 42m 30s}  -14.96d {-14d 57' 44"}
MOON_DIST:       122.31 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      239.73,-44.06 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       53.58,-57.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 11 Jun 22 18:16:21 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1110090,   Seg_Num: 0
POINT_RA:         66.563d {+04h 26m 15s} (J2000)
POINT_DEC:       -37.263d {-37d 15' 45"} (J2000)
POINT_ROLL:      14.025d
IMG_START_DATE:  19741 TJD;   162 DOY;   22/06/11
IMG_START_TIME:  65221.93 SOD {18:07:01.93} UT,   310.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.184
N_STARS:         116
X_OFFSET:        0 [pixels]
Y_OFFSET:        293 [pixels]
X_MAX:           1439 [pixels]
Y_MAX:           1732 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw01110090000msufc0310.fits
SUN_POSTN:        80.00d {+05h 20m 00s}  +23.12d {+23d 07' 02"}
SUN_DIST:         61.61 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      220.62d {+14h 42m 29s}  -14.96d {-14d 57' 36"}
MOON_DIST:       122.31 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      239.73,-44.06 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       53.58,-57.78 [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:     Sat 11 Jun 22 18:19:42 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1110090,   Seg_Num: 0
POINT_RA:         66.562d {+04h 26m 15s} (J2000)
POINT_DEC:       -37.263d {-37d 15' 47"} (J2000)
POINT_ROLL:      14.026d
IMG_START_DATE:  19741 TJD;   162 DOY;   22/06/11
IMG_START_TIME:  65777.26 SOD {18:16:17.26} UT,   866.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.813
N_STARS:         72
X_OFFSET:        0 [pixels]
Y_OFFSET:        293 [pixels]
X_MAX:           1439 [pixels]
Y_MAX:           1732 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw01110090000msufc0866.fits
SUN_POSTN:        80.00d {+05h 20m 01s}  +23.12d {+23d 07' 03"}
SUN_DIST:         61.61 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      220.65d {+14h 42m 36s}  -14.97d {-14d 58' 23"}
MOON_DIST:       122.31 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      239.73,-44.06 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       53.58,-57.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 11 Jun 22 18:21:03 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1110090,   Seg_Num: 0
POINT_RA:         66.562d {+04h 26m 15s} (J2000)
POINT_DEC:       -37.263d {-37d 15' 47"} (J2000)
ROLL:            14.026d
IMG_START_DATE:  19741 TJD;   162 DOY;   22/06/11
IMG_START_TIME:  65777.26 SOD {18:16:17.26} UT,   866.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     676664206
X_OFFSET:        559 [pixels]
Y_OFFSET:        852 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       719
Y_GRB_POS:       1012
BINNING_INDEX:   1
IM_URL:          sw01110090000msuni0896.fits
SUN_POSTN:        80.00d {+05h 20m 01s}  +23.12d {+23d 07' 03"}
SUN_DIST:         61.61 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      220.66d {+14h 42m 40s}  -14.98d {-14d 58' 42"}
MOON_DIST:       122.32 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      239.73,-44.06 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       53.58,-57.78 [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:     Sat 11 Jun 22 18:19:50 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1110090,   Seg_Num: 0
POINT_RA:         66.562d {+04h 26m 15s} (J2000)
POINT_DEC:       -37.263d {-37d 15' 47"} (J2000)
POINT_ROLL:      14.026d
IMG_START_DATE:  19741 TJD;   162 DOY;   22/06/11
IMG_START_TIME:  65777.26 SOD {18:16:17.26} UT,   866.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.813
N_STARS:         72
X_OFFSET:        0 [pixels]
Y_OFFSET:        293 [pixels]
X_MAX:           1439 [pixels]
Y_MAX:           1732 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw01110090000msufc0866.fits
SUN_POSTN:        80.00d {+05h 20m 01s}  +23.12d {+23d 07' 03"}
SUN_DIST:         61.61 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      220.65d {+14h 42m 37s}  -14.97d {-14d 58' 25"}
MOON_DIST:       122.31 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      239.73,-44.06 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       53.58,-57.78 [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:     Sat 11 Jun 22 18:20:32 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     1110090,   Seg_Num: 0
GRB_RA:           66.5141d {+04h 26m 03.38s} (J2000),
                  66.7145d {+04h 26m 51.48s} (current),
                  66.0679d {+04h 24m 16.28s} (1950)
GRB_DEC:         -37.2589d {-37d 15' 32.0"} (J2000),
                 -37.2093d {-37d 12' 33.5"} (current),
                 -37.3708d {-37d 22' 15.0"} (1950)
GRB_ERROR:       1.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  19741 TJD;   162 DOY;   22/06/11
IMG_START_TIME:  65339.00 SOD {18:08:59.00} UT,   427.8 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        80.00d {+05h 20m 01s}  +23.12d {+23d 07' 03"}
SUN_DIST:         61.61 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      220.66d {+14h 42m 38s}  -14.98d {-14d 58' 35"}
MOON_DIST:       122.34 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      239.72,-44.10 [deg] galactic lon,lat of the burst
ECL_COORDS:       53.52,-57.76 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 1.1% < P(seren) < 2.8%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 11 Jun 22 18:21:17 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1110090,   Seg_Num: 0
POINT_RA:         66.562d {+04h 26m 15s} (J2000)
POINT_DEC:       -37.263d {-37d 15' 47"} (J2000)
ROLL:            14.026d
IMG_START_DATE:  19741 TJD;   162 DOY;   22/06/11
IMG_START_TIME:  65777.26 SOD {18:16:17.26} UT,   866.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     676664206
X_OFFSET:        559 [pixels]
Y_OFFSET:        852 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       719
Y_GRB_POS:       1012
BINNING_INDEX:   1
IM_URL:          sw01110090000msuni0896.fits
SUN_POSTN:        80.01d {+05h 20m 01s}  +23.12d {+23d 07' 03"}
SUN_DIST:         61.61 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      220.67d {+14h 42m 40s}  -14.98d {-14d 58' 45"}
MOON_DIST:       122.32 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      239.73,-44.06 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       53.58,-57.78 [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 #32191
S. B. Cenko (GSFC), E. Ambrosi (INAF-IASFPA), S. D. Barthelmy (GSFC), V. D'Elia (SSDC & INAF-OAR), J.D. Gropp (PSU), J. A. Kennea (PSU), S. Laha (GSFC/UMBC), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL) and A. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift Observatory Team:
At 18:01:51 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 220611A (trigger=1110090). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 66.526d, -37.289d which is
```
   RA(J2000) = 04h 26m 06s
   Dec(J2000) = -37d 17' 20
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). Due to a telemetry gap, the BAT onboard lightcurve is not immediately available. However, the triggering algorithm found the source in an 8 second image, indicating a long GRB.
The XRT began observing the field at 18:04:20.4 UT, 149.2 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 66.51418, -37.25899 which is equivalent to:
```
   RA(J2000)  = 04h 26m 03.40s
   Dec(J2000) = -37d 15' 32.4"
```
with an uncertainty of 1.9 arcseconds (radius, 90% containment). This location is 113 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 https://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 2.66 x 10^20 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 152 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers none of the XRT error circle. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.033.
We note that this source location is ~15 arcsec from the line of sight to the galaxy MCG-06-10-007, which is described in Simbad as an S0 galaxy, B=16.3, z~0.049, angular size 18"x16".
Burst Advocate for this burst is S. B. Cenko (brad.cenko AT nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/)
GCN Circular #32192
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 496 s of XRT Photon Counting mode data and 1 UVOT images for GRB 220611A, 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 = 66.51464, -37.26019 which is equivalent to:
```
RA (J2000): 04h 26m 3.51s
Dec (J2000): -37d 15' 36.7"
```
with an uncertainty of 2.4 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #32194
J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), E. Ambrosi (INAF-IASFPA) , M. Capalbi (INAF-IASFPA), M. Perri (SSDC & INAF-OAR), J. D. Gropp (PSU), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), A.P. Beardmore (U. Leicester) and S.B. Cenko report on behalf of the Swift-XRT team:
We have analysed 6.8 ks of XRT data for GRB 220611A (Cenko et al. GCN Circ. 32191), from 133 s to 40.2 ks after the BAT trigger. The data comprise 270 s in Windowed Timing (WT) mode (the first 10 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 32192).
The late-time light curve (from T0+5.3 ks) can be modelled with a power-law decay with a decay index of alpha=0.28 (+0.19, -0.21).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.31 (+/-0.06). The best-fitting absorption column is 1.04 (+0.13, -0.12) x 10^21 cm^-2, in excess of the Galactic value of 2.7 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.96 (+0.18, -0.08) and a best-fitting absorption column consistent with the Galactic value. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.2 x 10^-11 (3.4 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.7 (+1.8, -0.0) x 10^20 cm^-2
Galactic foreground: 2.7 x 10^20 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.96 (+0.18, -0.08)
```
If the light curve continues to decay with a power-law decay index of 0.28, the count rate at T+24 hours will be 0.045 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.5 x 10^-12 (1.6 x 10^-12) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01110090.
This circular is an official product of the Swift-XRT team.
GCN Circular #32195
V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin (Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA),
R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias),
D. Buckley (South African Astronomical Observatory),
O.A. Gres, N.M. Budnev (Irkutsk State University, API),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov (Blagoveschensk Educational State University)
MASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) was pointed to the Swift GRB 220611A ( S. B. Cenko et al., GCN 32191) errorbox 55433 sec after notice time and 55505 sec after trigger time at 2022-06-12 09:26:56 UT, with upper limit up to 18.6 mag. The observations began at zenith distance = 74 deg. The sun altitude is -25.6 deg.
The galactic latitude b = -44 deg., longitude l = 240 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2003639
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________


   55596 |         MASTER-OAFA |   C |   180 | 18.0 |        
   56606 |         MASTER-OAFA |   C |   180 | 18.1 |        
   56950 |         MASTER-OAFA |   C |   180 | 18.6 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #32197
C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), S. B. Cenko (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), D. M. Palmer (LANL), T. Parsotan (GSFC/UMBC), T. Sakamoto (AGU), M. Stamatikos (OSU) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 220611A (trigger #1110090) (Cenko et al., GCN Circ. 32191). The BAT ground-calculated position is RA, Dec = 66.505, -37.265 deg which is
```
   RA(J2000)  =  04h 26m 01.2s
   Dec(J2000) = -37d 15' 54.2"
```
with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 70%.
The mask-weighted light curve shows a weak pulse that starts at ~T0 and ends at ~T+60 s. There might be a possible precursor emission (~ 5 sigma in the 15-350 keV image) from ~T-90 s to ~T-85 s. T90 (15-350 keV) is 57.00 +- 12.37 sec (estimated error including systematics).
The time-averaged spectrum from T+0.52 to T+61.52 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.87 +- 0.29. The fluence in the 15-150 keV band is 6.7 +- 1.3 x 10^-7 erg/cm2. 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/1110090/BA/
GCN Circular #32201
M. H. Siegel (PSU) and S. B. Cenko (GSFC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 220611A 153 s after the BAT trigger (Cenko et al., GCN Circ. 32191). No optical afterglow consistent with the XRT position (Cenko et al. GCN Circ. 32191) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC           153          302          147         >19.5
u_FC               311          561          246         >19.1
white              153          926          245         >19.5
v                  641          835           39         >17.0
b                  566          759           39         >18.2
u                  311          734          265         >19.1
w1                 690          710           19         >17.7
m2                 665          685           19         >17.9
w2                 616          636           19         >18.7
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.033 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #32203
B. O'Connor (UMD/GWU), E. Troja (Tor Vergata), S. Dichiara (PSU), on behalf of a larger collaboration:
We performed target of opportunity observations of GRB 220611A (Cenko et al. GCN 32191) with the FLAMINGOS-2 spectrograph mounted on the Gemini-South telescope. Observations were carried out in the Ks filter with a total exposure of 260 s beginning at 3.7 d post-trigger.
We detect a faint source within the XRT position (Goad et al. 32192) with magnitude Ks = 20.0+/-0.3 AB mag. The object is located at:
RA, DEC = 04:26:03.56, -37:15:34.97
with an uncertainty of 0.5". This source is offset by 6" and 13", respectively, from two bright galaxies. The latter is located at redshift z~0.049 (Cenko et al. GCN 32191). Further observations are planned to determine whether the source is fading or if it is dominated by the contribution from an underlying host galaxy.
We thank the staff of the Gemini Observatory, in particular Steve Margheim and Joan Font-Serra, for rapid scheduling of these observations. We thank Rodrigo Carrasco for carrying out the observations.
GCN Circular #32208
J. Rastinejad (Northwestern), A. J. Levan (Radboud), D. B. Malesani (Radbou= d and DAWN/NBI), B. P. Gompertz (Birmingham), W. Fong, C. D. Kilpatrick (No= rthwestern) report on behalf of a larger collaboration:
We observed the location of GRB 220611A (Cenko et al., GCN 32191) with the = FLAMINGOS-2 instrument mounted on the Gemini-South 8-meter telescope on Cer= ro Pachon, Chile. At a mid-time of 2022 Jun 17.43 UT (~5.7 days post-burst)= , we obtained 48 x 11 s of K-band imaging at a median airmass of 2.15 and s= eeing of 1.1 arcsec. A K-band source is detected at the location reported b= y O'Connor et al. (GCN 32203). Based on calibration to 2MASS, we estimate a= preliminary magnitude for the source of K_AB ~ 21.1 +/- 0.2 mag. Compared = to the measurement reported by O'Connor et al. (K_AB =3D 20.0 +/- 0.3 mag),= our value is indicative of fading, though we note that the strong, non-uni= form background due to the nearby galaxy MCG-06-10-007 and the lack of a co= mmon set of calibrators prevent a definitive statement. Furthermore, the so= urce is not detected in archival imaging from the VISTA Hemisphere Survey (= VHS; Cross et al. 2012), from which we measure a limiting magnitude K_AB > = 20.5 mag. If confirmed, the fading and the non-detection in the VHS images = would indicate that this object is transient, thus likely associated with G= RB 220611A.=20
We also note that a faint optical source is visible in r-band Legacy Source= imaging (Dey et al. 2019) at the location reported by O'Connor et al. (GCN= 32203). We measure a preliminary magnitude of r_AB ~ 24.5 +/- 0.3 mag for = this source (again, uncertain due to the strong, non-uniform background). A= t present, it is not possible to discern if this source is associated with = the z =3D 0.049 galaxy, or is a fainter, background galaxy.=20
Further observations are planned. We thank Jen Andrews, German Gimeno and R= icardo Salinas at Gemini for the rapid planning and execution of these obse= rvations.
GCN Circular #32217
B. O’Connor (UMD/GWU), E. Troja (U Tor Vergata/ASU) , S. Dichiara (PSU), and S. B. Cenko (NASA/GSFC) report on behalf of a larger collaboration:
We carried out additional target of opportunity observations of GRB220611A (Cenko et al. GCN 32191) with the Gemini Multi Object Spectrograph (GMOS) mounted on the Gemini-South telescope. The observations began 5.7 d after the GRB trigger, and were performed in i-band for a total exposure of 540 s.
We detect the source reported by O’Connor et al. (GCN 32203) with magnitude i~21 AB. This source is not detected in archival images from the Dark Energy Survey (Abbott et al. 2021), and is likely the GRB afterglow. We determine that the X-ray, optical, and infrared data (O’Connor et al. GCN 32203, Rastinejad et al. GCN 32208) can be modeled by a power-law with spectral index beta~1.
Further observations are planned.
We thank the Gemini staff for rapid scheduling of these observations.
GCN Circular #32222
D. B. Malesani (Radboud Univ. and DAWN/NBI), G. Pugliese (Amsterdam Univ. and Leiden Observatory), P. Schady (Univ. Bath), A. J. Levan (Radboud Univ.), B. P. Gompertz (Birmingham), report on behalf of the Stargate collaboration:
We observed the candidate counterpart (O'Connor et al., GCN 32203; Rastinejad et al., GCN 32208) of GRB 221106A (Cenko et al., GCN 32191) using the ESO VLT UT1 (Antu) equipped with the FORS2 imager. Observations were taken in twilight using the I filter, at an average airmass of 2.6, and with a delivered seeing of 1.9". The mean time of the observation (twenty 30-s images) was Jun 18.42 UT (6.67 days after the GRB).
The object noted by O'Connor et al. (GCN 32203) is detected in the stack of our data. Calibrating against three stars from the SkyMapper survey, we measure a preliminary magnitude of i = 23.0 +- 0.2 (AB).
Compared to the archival brightness r = 24.5 from the Legacy Survey (Rastinejad et al., GCN 32208), our measurement favors some transient contribution, consolidating the association of this object to GRB 220611A. Alternatively, the source could be very red, which would however be in contrast with the non-detection in the Legacy Survey z-band image.
We note that the observed magnitude is fainter by ~4.5 mag than what SN 1998bw would look like at z = 0.049, likely ruling out a traditional collapsar GRB in MCG-06-10-007. GRB 221106A might be a background event (consistent with the detection of a potential host galaxy in the Legacy Survey) or, speculatively, originate from a merger event, which would be more consistent with the offset and spectral type of MCG-06-10-007.
We acknowledge support with this difficult observation from the VLT staff at Paranal, in particular Cedric Ledoux and Joseph Anderson.
GCN Circular #32228
B. O'Connor (UMD/GWU), E. Troja (U Tor Vergata/ASU), S. Dichiara (PSU), S. B. Cenko (UMD/GSFC), report on behalf of a larger collaboration:
Additional target of opportunity observations of GRB 220611A (Cenko et al. GCN 32191) were carried out with the FLAMINGOS-2 spectrograph mounted on the Gemini-South telescope. Observations began at ~7.7 d in the Ks filter with a total exposure of 912 s.
We detect the GRB afterglow (O’Connor et al. GCNs 32203 and 32217, Rastinejad et al. GCN 32208, Malesani et al. GCN 32222) with magnitude Ks~21.8 AB mag calibrated against stars in the 2MASS catalog. Compared to earlier Ks data (O’Connor et al. GCN 32203, Rastinejad et al. GCN 32208), the infrared counterpart’s temporal decay is consistent with the decay observed in X-rays by Swift/XRT.
We thank the Gemini staff for rapid scheduling of these observations.
GCN Circular #32262
A. J. Levan (Radboud Univ.), D. B. Malesani (Radboud Univ. and DAWN/NBI), B. P. Gompertz (Birmingham) report on behalf of a larger collaboration:
The Chandra X-ray observatory imaged the X-ray afterglow of GRB 220611A (Cenko et al., GCN 32191). Observations started on 2022 Jun 23.92 UT (12.15 days after the GRB), using the ACIS-S instrument, for a total exposure time of 15 ks.
We detect a single object consistent with the Swift X-ray position (Goad et al., GCN 32192), with a total of ~30 source counts. Its coordinates are (J2000):
```
RA = 04:26:03.57
Dec = -37:15:35.1
```
with an uncertainty of ~0.5". This position is consistent with the optical and near-infrared source reported by Gemini-S (O’Connor et al., GCN 32203, 32217; Rastinejad et al., GCN 32208) and VLT (Malesani et al., GCN 32222), as well as with the source seen in archival images from the Legacy Survey. This detection thus cements the nature of this object as the mutli-wavelength afterglow of GRB 220611A.
We thank the Chandra director, Pat Slane, for awarding discretionary time to this project, and the observatory staff for rapidly planning and scheduling these observations.
GCN Circular #32595
B. Schneider (CEA Paris-Saclay), D. B. Malesani (Radboud Univ. and DAWN/NBI), J. P. U. Fynbo (DAWN/NBI), K. Wiersema (Univ. Lancaster), L. Izzo (DARK/NBI), A. J. Levan (Radboud Univ.) report on behalf of the Stargate collaboration:
We observed the location of GRB 220611A (Cenko et al., GCN 32191; Goad et al., GCN 32192; O’Connor et al., GCN 32203; Rastinejad et al., GCN 32208; Malesani et al., GCN 32222; Levan et al., GCN 32262) using the X-shooter spectrograph mounted on the ESO VLT UT3 (Melipal). Our target was the faint object visible in the archival optical images from the Legacy Survey, coincident with the optical and X-ray afterglow, first noticed by Rastinejad et al. (GCN 32208).
The observation was performed on 2022 September 23 (104 days after the GRB) and consisted of 4x1200 s in the UVB and VIS arms and 8x600 s in the NIR arm. A filter was adopted to block part of the K band which in return increases the efficiency of the J and H bands, resulting in a wavelength coverage between 3000 to 21000 AA.
In a preliminary reduction, we detect several strong emission lines that we identify as Lyman-alpha, [O II] 3729, [O III] 4959 and [O III] 5007 at a common redshift of z = 2.3608 +/- 0.0002. The [O II] 3726 and H-beta lines are affected by sky lines and are consequently not clearly detected. H-alpha falls outside the covered wavelength range.
This result is supported by a VLT/MUSE spectrum obtained on 2022 August 24, covering the wavelength range 4800 to 9300 AA, which shows no emission nor absorption features, consistent with the measured redshift from X-shooter.
The positional coincidence between our target and the optical and X-ray afterglow suggests a physical association. Furthermore, our spectra show that the archival counterpart is a star-forming galaxy, akin to a typical long GRB host. Our observations bring thus evidence that the GRB was not physically associated with the local, nearby galaxy MCG-06-10-007 at z = 0.049 (Cenko et al., GCN 32191), and their proximity is a chance coincidence.
We acknowledge expert support from the ESO staff in Paranal, in particular Thomas Rivinius and Michael Abdul-Masih.

Back to JG's homepage

Jochen Greiner, last update: 27-Sep-2022 [Disclaimer]