Gamma-ray Burst 100805A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 05 Aug 10 04:13:38 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     430957,   Seg_Num: 0
GRB_RA:          299.874d {+19h 59m 30s} (J2000),
                 299.943d {+19h 59m 46s} (current),
                 299.549d {+19h 58m 12s} (1950)
GRB_DEC:         +52.614d {+52d 36' 52"} (J2000),
                 +52.644d {+52d 38' 38"} (current),
                 +52.477d {+52d 28' 35"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       32148 [cnts]    Image_Peak=420 [image_cnts]
TRIGGER_DUR:     8.192 [sec] 
TRIGGER_INDEX:   338     E_range: 25-100 keV
BKG_INTEN:       238151 [cnts]
BKG_TIME:        15073.94 SOD {04:11:13.94} UT
BKG_DUR:         64 [sec]
GRB_DATE:        15413 TJD;   217 DOY;   10/08/05
GRB_TIME:        15162.26 SOD {04:12:42.26} UT
GRB_PHI:         157.16 [deg]
GRB_THETA:        39.12 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.63 [sigma]
IMAGE_SIGNIF:    7.08 [sigma]
MERIT_PARAMS:     +1  +0  +0  +3  +2  -3  +0  +0 +32  +0 
SUN_POSTN:       135.12d {+09h 00m 29s}  +17.01d {+17d 00' 32"}
SUN_DIST:        109.12 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       63.62d {+04h 14m 29s}  +24.24d {+24d 14' 16"}
MOON_DIST:        88.88 [deg]
MOON_ILLUM:      30 [%]
GAL_COORDS:       86.56, 11.78 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      331.09, 69.79 [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 = 318.89,20.21 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 05 Aug 10 04:14:56 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     430957,   Seg_Num: 0
POINT_RA:        299.863d {+19h 59m 27s} (J2000)
POINT_DEC:       +52.623d {+52d 37' 23"} (J2000)
IMG_START_DATE:  15413 TJD;   217 DOY;   10/08/05
IMG_START_TIME:  15288.67 SOD {04:14:48.67} UT,   126.4 [sec] since BAT Trigger Time
COUNTS:          12    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:     Thu 05 Aug 10 04:16:30 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     430957,   Seg_Num: 0
GRB_RA:          299.874d {+19h 59m 30s} (J2000),
                 299.943d {+19h 59m 46s} (current),
                 299.549d {+19h 58m 12s} (1950)
GRB_DEC:         +52.614d {+52d 36' 52"} (J2000),
                 +52.644d {+52d 38' 38"} (current),
                 +52.477d {+52d 28' 35"} (1950)
GRB_DATE:        15413 TJD;   217 DOY;   10/08/05
GRB_TIME:        15162.26 SOD {04:12:42.26} UT
TRIGGER_INDEX:   338
GRB_PHI:         157.16 [deg]
GRB_THETA:        39.12 [deg]
DELTA_TIME:      -31.00 [sec]
TRIGGER_DUR:     8.192 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.63 [sigma]
IMAGE_SIGNIF:    7.08 [sigma]
LC_URL:          sw00430957000msb.lc
SUN_POSTN:       135.12d {+09h 00m 30s}  +17.01d {+17d 00' 30"}
SUN_DIST:        109.12 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       63.65d {+04h 14m 36s}  +24.24d {+24d 14' 26"}
MOON_DIST:        88.89 [deg]
MOON_ILLUM:      30 [%]
GAL_COORDS:       86.56, 11.78 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      331.09, 69.79 [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 = 318.89,20.21 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 05 Aug 10 04:17:49 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     430957,   Seg_Num: 0
POINT_RA:        299.863d {+19h 59m 27s} (J2000)
POINT_DEC:       +52.623d {+52d 37' 24"} (J2000)
POINT_ROLL:      344.539d
IMG_START_DATE:  15413 TJD;   217 DOY;   10/08/05
IMG_START_TIME:  15292.18 SOD {04:14:52.18} UT,   129.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.845
N_STARS:         190
X_OFFSET:        417 [pixels]
Y_OFFSET:        603 [pixels]
X_MAX:           1376 [pixels]
Y_MAX:           1562 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00430957000msufc0129.fits
SUN_POSTN:       135.12d {+09h 00m 30s}  +17.01d {+17d 00' 29"}
SUN_DIST:        109.11 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       63.66d {+04h 14m 39s}  +24.24d {+24d 14' 31"}
MOON_DIST:        88.90 [deg]
MOON_ILLUM:      30 [%]
GAL_COORDS:       86.56, 11.79 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      331.09, 69.80 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 05 Aug 10 04:18:18 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     430957,   Seg_Num: 0
POINT_RA:        299.863d {+19h 59m 27s} (J2000)
POINT_DEC:       +52.623d {+52d 37' 24"} (J2000)
POINT_ROLL:      344.539d
IMG_START_DATE:  15413 TJD;   217 DOY;   10/08/05
IMG_START_TIME:  15292.18 SOD {04:14:52.18} UT,   129.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.845
N_STARS:         190
X_OFFSET:        417 [pixels]
Y_OFFSET:        603 [pixels]
X_MAX:           1376 [pixels]
Y_MAX:           1562 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00430957000msufc0129.fits
SUN_POSTN:       135.12d {+09h 00m 30s}  +17.01d {+17d 00' 28"}
SUN_DIST:        109.11 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       63.67d {+04h 14m 40s}  +24.24d {+24d 14' 32"}
MOON_DIST:        88.90 [deg]
MOON_ILLUM:      30 [%]
GAL_COORDS:       86.56, 11.79 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      331.09, 69.80 [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:     Thu 05 Aug 10 04:19:13 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     430957,   Seg_Num: 0
POINT_RA:        299.863d {+19h 59m 27s} (J2000)
POINT_DEC:       +52.623d {+52d 37' 24"} (J2000)
ROLL:            344.539d
IMG_START_DATE:  15413 TJD;   217 DOY;   10/08/05
IMG_START_TIME:  15292.18 SOD {04:14:52.18} UT,   129.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     302674498
X_OFFSET:        736 [pixels]
Y_OFFSET:        922 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       896
Y_GRB_POS:       1082
BINNING_INDEX:   1
IM_URL:          sw00430957000msuni0136.fits
SUN_POSTN:       135.13d {+09h 00m 30s}  +17.01d {+17d 00' 28"}
SUN_DIST:        109.11 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       63.68d {+04h 14m 42s}  +24.24d {+24d 14' 35"}
MOON_DIST:        88.90 [deg]
MOON_ILLUM:      30 [%]
GAL_COORDS:       86.56, 11.79 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      331.09, 69.80 [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:     Thu 05 Aug 10 04:19:29 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     430957,   Seg_Num: 0
POINT_RA:        299.863d {+19h 59m 27s} (J2000)
POINT_DEC:       +52.623d {+52d 37' 24"} (J2000)
ROLL:            344.539d
IMG_START_DATE:  15413 TJD;   217 DOY;   10/08/05
IMG_START_TIME:  15292.18 SOD {04:14:52.18} UT,   129.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     302674498
X_OFFSET:        736 [pixels]
Y_OFFSET:        922 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       896
Y_GRB_POS:       1082
BINNING_INDEX:   1
IM_URL:          sw00430957000msuni0136.fits
SUN_POSTN:       135.13d {+09h 00m 30s}  +17.01d {+17d 00' 28"}
SUN_DIST:        109.11 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       63.68d {+04h 14m 43s}  +24.24d {+24d 14' 36"}
MOON_DIST:        88.90 [deg]
MOON_ILLUM:      30 [%]
GAL_COORDS:       86.56, 11.79 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      331.09, 69.80 [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:     Thu 05 Aug 10 04:20:23 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     430957,   Seg_Num: 0
GRB_RA:          299.8755d {+19h 59m 30.11s} (J2000),
                 299.9443d {+19h 59m 46.62s} (current),
                 299.5508d {+19h 58m 12.18s} (1950)
GRB_DEC:         +52.6275d {+52d 37' 38.9"} (J2000),
                 +52.6569d {+52d 39' 24.8"} (current),
                 +52.4895d {+52d 29' 22.2"} (1950)
GRB_ERROR:       3.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15413 TJD;   217 DOY;   10/08/05
IMG_START_TIME:  15347.00 SOD {04:15:47.00} UT,   184.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       135.13d {+09h 00m 30s}  +17.01d {+17d 00' 27"}
SUN_DIST:        109.10 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       63.69d {+04h 14m 45s}  +24.24d {+24d 14' 39"}
MOON_DIST:        88.90 [deg]
MOON_ILLUM:      30 [%]
GAL_COORDS:       86.57, 11.79 [deg] galactic lon,lat of the burst
ECL_COORDS:      331.12, 69.80 [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:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 05 Aug 10 04:17:49 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     430957,   Seg_Num: 0
POINT_RA:        299.863d {+19h 59m 27s} (J2000)
POINT_DEC:       +52.623d {+52d 37' 24"} (J2000)
POINT_ROLL:      344.539d
IMG_START_DATE:  15413 TJD;   217 DOY;   10/08/05
IMG_START_TIME:  15292.18 SOD {04:14:52.18} UT,   129.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.845
N_STARS:         190
X_OFFSET:        417 [pixels]
Y_OFFSET:        603 [pixels]
X_MAX:           1376 [pixels]
Y_MAX:           1562 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00430957000msufc0129.fits
SUN_POSTN:       135.12d {+09h 00m 30s}  +17.01d {+17d 00' 29"}
SUN_DIST:        109.11 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       63.66d {+04h 14m 39s}  +24.24d {+24d 14' 31"}
MOON_DIST:        88.90 [deg]
MOON_ILLUM:      30 [%]
GAL_COORDS:       86.56, 11.79 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      331.09, 69.80 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 05 Aug 10 04:23:17 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     430957,   Seg_Num: 0
GRB_RA:          299.8772d {+19h 59m 30.52s} (J2000),
                 299.9460d {+19h 59m 47.02s} (current),
                 299.5525d {+19h 58m 12.59s} (1950)
GRB_DEC:         +52.6278d {+52d 37' 40.0"} (J2000),
                 +52.6572d {+52d 39' 25.9"} (current),
                 +52.4898d {+52d 29' 23.2"} (1950)
GRB_ERROR:       0.6 [arcsec radius, statistical only]
GRB_MAG:         18.00 +/- 0.14 [mag]
FILTER:          10, White
IMG_START_DATE:  15413 TJD;   217 DOY;   10/08/05
IMG_START_TIME:  15296.00 SOD {04:14:56.00} UT,   133.7 [sec] since BAT Trigger Time
SUN_POSTN:       135.13d {+09h 00m 31s}  +17.01d {+17d 00' 25"}
SUN_DIST:        109.10 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       63.72d {+04h 14m 52s}  +24.25d {+24d 14' 49"}
MOON_DIST:        88.91 [deg]
MOON_ILLUM:      30 [%]
GAL_COORDS:       86.57, 11.79 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      331.12, 69.80 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 05 Aug 10 04:25:51 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     430957,   Seg_Num: 0
POINT_RA:        299.866d {+19h 59m 28s} (J2000)
POINT_DEC:       +52.624d {+52d 37' 27"} (J2000)
POINT_ROLL:      344.543d
IMG_START_DATE:  15413 TJD;   217 DOY;   10/08/05
IMG_START_TIME:  15450.30 SOD {04:17:30.30} UT,   288.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.586
N_STARS:         190
X_OFFSET:        177 [pixels]
Y_OFFSET:        363 [pixels]
X_MAX:           1616 [pixels]
Y_MAX:           1802 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00430957000msufc0288.fits
SUN_POSTN:       135.13d {+09h 00m 31s}  +17.01d {+17d 00' 23"}
SUN_DIST:        109.11 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       63.74d {+04h 14m 58s}  +24.25d {+24d 14' 58"}
MOON_DIST:        88.93 [deg]
MOON_ILLUM:      30 [%]
GAL_COORDS:       86.56, 11.79 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      331.10, 69.80 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 05 Aug 10 04:25:51 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     430957,   Seg_Num: 0
POINT_RA:        299.866d {+19h 59m 28s} (J2000)
POINT_DEC:       +52.624d {+52d 37' 27"} (J2000)
POINT_ROLL:      344.543d
IMG_START_DATE:  15413 TJD;   217 DOY;   10/08/05
IMG_START_TIME:  15450.30 SOD {04:17:30.30} UT,   288.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.586
N_STARS:         190
X_OFFSET:        177 [pixels]
Y_OFFSET:        363 [pixels]
X_MAX:           1616 [pixels]
Y_MAX:           1802 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00430957000msufc0288.fits
SUN_POSTN:       135.13d {+09h 00m 31s}  +17.01d {+17d 00' 23"}
SUN_DIST:        109.11 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       63.74d {+04h 14m 58s}  +24.25d {+24d 14' 58"}
MOON_DIST:        88.93 [deg]
MOON_ILLUM:      30 [%]
GAL_COORDS:       86.56, 11.79 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      331.10, 69.80 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 05 Aug 10 04:26:09 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     430957,   Seg_Num: 0
POINT_RA:        299.866d {+19h 59m 28s} (J2000)
POINT_DEC:       +52.624d {+52d 37' 27"} (J2000)
POINT_ROLL:      344.543d
IMG_START_DATE:  15413 TJD;   217 DOY;   10/08/05
IMG_START_TIME:  15450.30 SOD {04:17:30.30} UT,   288.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.586
N_STARS:         190
X_OFFSET:        177 [pixels]
Y_OFFSET:        363 [pixels]
X_MAX:           1616 [pixels]
Y_MAX:           1802 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00430957000msufc0288.fits
SUN_POSTN:       135.13d {+09h 00m 31s}  +17.01d {+17d 00' 23"}
SUN_DIST:        109.11 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       63.75d {+04h 14m 59s}  +24.25d {+24d 14' 59"}
MOON_DIST:        88.93 [deg]
MOON_ILLUM:      30 [%]
GAL_COORDS:       86.56, 11.79 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      331.10, 69.80 [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:     Thu 05 Aug 10 04:26:42 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     430957,   Seg_Num: 0
GRB_RA:          299.8759d {+19h 59m 30.21s} (J2000),
                 299.9447d {+19h 59m 46.71s} (current),
                 299.5512d {+19h 58m 12.28s} (1950)
GRB_DEC:         +52.6278d {+52d 37' 40.0"} (J2000),
                 +52.6572d {+52d 39' 25.9"} (current),
                 +52.4898d {+52d 29' 23.2"} (1950)
GRB_ERROR:       2.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15413 TJD;   217 DOY;   10/08/05
IMG_START_TIME:  15347.00 SOD {04:15:47.00} UT,   184.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       135.13d {+09h 00m 31s}  +17.01d {+17d 00' 23"}
SUN_DIST:        109.10 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       63.75d {+04h 15m 00s}  +24.25d {+24d 15' 00"}
MOON_DIST:        88.92 [deg]
MOON_ILLUM:      30 [%]
GAL_COORDS:       86.57, 11.79 [deg] galactic lon,lat of the burst
ECL_COORDS:      331.12, 69.80 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 05 Aug 10 04:27:17 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     430957,   Seg_Num: 0
POINT_RA:        299.866d {+19h 59m 28s} (J2000)
POINT_DEC:       +52.624d {+52d 37' 27"} (J2000)
ROLL:            344.543d
IMG_START_DATE:  15413 TJD;   217 DOY;   10/08/05
IMG_START_TIME:  15450.30 SOD {04:17:30.30} UT,   288.0 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     302674656
X_OFFSET:        736 [pixels]
Y_OFFSET:        922 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       896
Y_GRB_POS:       1082
BINNING_INDEX:   1
IM_URL:          sw00430957000msuni0295.fits
SUN_POSTN:       135.13d {+09h 00m 31s}  +17.01d {+17d 00' 22"}
SUN_DIST:        109.11 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       63.76d {+04h 15m 02s}  +24.25d {+24d 15' 02"}
MOON_DIST:        88.93 [deg]
MOON_ILLUM:      30 [%]
GAL_COORDS:       86.56, 11.79 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      331.10, 69.80 [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:     Thu 05 Aug 10 04:27:34 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     430957,   Seg_Num: 0
POINT_RA:        299.866d {+19h 59m 28s} (J2000)
POINT_DEC:       +52.624d {+52d 37' 27"} (J2000)
ROLL:            344.543d
IMG_START_DATE:  15413 TJD;   217 DOY;   10/08/05
IMG_START_TIME:  15450.30 SOD {04:17:30.30} UT,   288.0 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     302674656
X_OFFSET:        736 [pixels]
Y_OFFSET:        922 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       896
Y_GRB_POS:       1082
BINNING_INDEX:   1
IM_URL:          sw00430957000msuni0295.fits
SUN_POSTN:       135.13d {+09h 00m 31s}  +17.01d {+17d 00' 22"}
SUN_DIST:        109.11 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       63.76d {+04h 15m 02s}  +24.25d {+24d 15' 03"}
MOON_DIST:        88.93 [deg]
MOON_ILLUM:      30 [%]
GAL_COORDS:       86.56, 11.79 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      331.10, 69.80 [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 #11047
E. A. Hoversten (PSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. M. Gelbord (PSU), C. Gronwall (PSU), S. T. Holland (CRESST/USRA/GSFC), D. M. Palmer (LANL), M. H. Siegel (PSU), M. C. Stroh (PSU) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team:
At 04:12:42 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 100805A (trigger=430957). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 299.874, +52.614 which is
```
   RA(J2000) = 19h 59m 30s
   Dec(J2000) = +52d 36' 52"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a peak with a duration of about 20 sec. The peak count rate was ~600 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 04:14:48.7 UT, 126.4 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source located at RA, Dec 299.87559, 52.62758 which is equivalent to:
```
   RA(J2000)  = 19h 59m 30.14s
   Dec(J2000) = +52d 37' 39.3"
```
with an uncertainty of 3.8 arcseconds (radius, 90% containment). This location is 47 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 1.69e+21 cm^-2 (Kalberla et al. 2005).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 129 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at RA(J2000) = 19:59:30.52 = 299.87716 DEC(J2000) = +52:37:40.3 = 52.62787 with a 90%-confidence error radius of about 0.62 arc sec. This position is 3.6 arc sec. from the center of the XRT error circle. The estimated magnitude is 18.00 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.19.
Burst Advocate for this burst is E. A. Hoversten (hoversten AT astro.psu.edu). 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 #11048
S. B. Pandey (U Mich) and W. Zheng (U Mich), report on behalf of the ROTSE collaboration:
ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB 100805A (Swift trigger 430957; Hoversten , E. A., GCN 11047), producing images beginning 6.2 s after the GCN notice time. An automated response took the first image at 04:13:39.2 UT, 50.9 s after the burst, under fair conditions. We took 10 5-sec, 10 20-sec and 10 60-sec exposures. These unfiltered images are calibrated relative to USNO A2.0 (R). Imaging is on going.
Comparison to the DSS (second epoch) reveals no new sources within the 3-sigma Swift/BAT error circle or at the Swift/UVOT position, for both single images and coadding into sets of 10. Individual images have limiting magnitudes ranging from 16.1-17.3; we set the following specific limits.
```
start UT       end UT      t_exp(s)   mlim   t_start-tGRB(s)  Coadd?
--------------------------------------------------------------------
04:13:39.2   04:13:44.2         5     16.1           50.9       N
04:14:59.3   04:19:41.7       282     18.0          131.0       Y
```
GCN Circular #11049
M. C. Stroh and E. A. Hoversten (PSU) report on behalf of the Swift-XRT team:
Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA,Dec = 299.8760, 52.6279 (degrees) which is equivalent to:
```
RA  (J2000.0) = 19 59 30.23
DEC (J2000.0) = +52 37 40.3
```
with an uncertainty of 2.3 arcsec (radius, 90% containment). This location is 48.4 arcseconds from the BAT onboard position, inside the BAT error circle.
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 #11050
S. B. Cenko (UC Berkeley) reports on behalf of a larger collaboration:
We have imaged the field of GRB 100805A (Swift trigger #430957) with the robotic Palomar 60 inch telescope. Images were obtained in the Sloan r', i', and z' filters beginning at 04:15 UT on 5 August (~ 3 minutes after the Swift trigger time).
At the edge of the XRT error circle we detect a bright point source not present in the Digital Sky Survey imaging of the field at coordinates (J2000.0):
RA: 19:59:30.53 Dec: +52:37:40.0
Calibrating with respect to the USNO-B1 catalog, we measure a preliminary magnitude or R = 17.3.
Observations to confirm the transient nature of this source are ongoing.
GCN Circular #11051
S. B. Cenko (UC Berkeley) reports on behalf of a larger collaboration:
We have continued to image the field of GRB 100805A with the automated Palomar 60 inch telescope (see GCN 11050). The object we identified as a candidate afterglow (first noted by Hoversten at al., GCN 11047) has faded significantly over the last hour, and we can therefore confirm this source is the optical afterglow of GRB 100805A. Using field stars from the USNO-B1 catalog for reference, we measure a magnitude of R = 19.5 at 04:56 UT on 5 August. Comparing with our previous measurement, we infer a power-law decay index of alpha ~ 0.8.
GCN Circular #11052
A. Gomboc (U. Ljubljana), C. Guidorzi (U. Ferrara), D. Kopac (U. Ljubljana) report on behalf of a larger collaboration:
On 2010 August 05 at 04:14:32 UT the 2-m Liverpool Telescope automatically began observing the Swift GRB 100805A (Hoversten et al., GCN Circ. 11047) with Ringo 2 instrument, continuing with multi-filter (g', r', i') observations at 6.7 min after the GRB trigger.
The LT-TRAP procedure automatically identified the optical afterglow at the UVOT position (Hoversten et al., GCN Circ. 11047, Cenko, GCN Circ. 11050) with the following magnitudes:
```
------------------------------------------------------------------------
T-t0 (s)	Exp. (s)		 Filter		   Mag             
------------------------------------------------------------------------
400  	     10                  r'                 17.92 +- 0.07
421       	     10                  r'                 17.93 +- 0.07
726              10                  r'                 18.36 +- 0.10
3386            60                  r'                 19.79 +- 0.12
------------------------------------------------
```
We confirm the power-law decay index of 0.8 found by P60 (Cenko, GCN Circ. 11051).
Magnitudes were calibrated from nearby USNOB1.0 R2 stars. Observations are continuing.
GCN Circular #11053
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 734 s of XRT Photon Counting mode data and 1 UVOT images for GRB 100805A, 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 = 299.87770, +52.62788 which is equivalent to:
```
RA (J2000): 19h 59m 30.65s
Dec (J2000): +52d 37' 40.4"
```
with an uncertainty of 1.8 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 #11054
J. Gorosabel, V. Terron, M. Jelinek, A.J. Castro-Tirado (IAA-CSIC), report on behalf of a larger collaboration:
"Following the detection of GRB 100805A by Swift (Hoversten et al. GCNC 11047) we carried out I-band observations with the 1.23m telescope at Observatory of Calar Alto. The first exposure started on Aug 5.1824 UT (~10 minutes post burst) with an integration time of 120s. The optical afterglow is well detected with a preliminary magnitude of I ~ 16.9, against USNO-B1.0 field stars."
GCN Circular #11056
Markku Nissinen (Taurus Hill Observatory) and Veli-Pekka Hentunen (Taurus Hill Observatory) report:
We used Global-rent-a-scope GRAS 002 Tak Mewlon 300 telescope with SBIG ST-8E CCD at RAS Observatory Mayhill H06 (New Mexico, USA) for follow-up observations of GRB 100805A (D. Palmer et al., GCN 11047). The observations were started on August 05, at 04:56 UTC (44 min after the burst) and stopped on August 05, at 06:29 UTC. Four luminance 600 seconds images and three optical R-band 600 seconds images were taken. We detected a very dim optical afterglow object at the position of RA 19h 59min 30s.64 and DEC +52o 37' 40".5 with respect to POSSII F/USNO-B1.0 (J2000) which is in good correlation with S.B. Cenko observations (GCN 11050). Upper limit for our luminance observations is >20.8 mag (LR) and R-band observations is >20.1 (R). Quoted upper limit has been derived using POSSII F and USNO-B1.0 field stars as reference.
```
Filter              Tmid(s)        Exp(s)      OA Mag  USNO-B1.0

luminance        2949          600          19.6+/-0.5 (LR)
luminance        3614          600          19.6+/-0.5 (LR)
luminance        4276          600          19.8+/-0.5 (LR)
luminance        8177          600          >20.8
optical R         5299          600          >20.1
optical R         5986          600          >20.1
optical R         7501          600          >20.1
```
URL-link to our luminance image: http://cutenews.kassiopeia.net/data/upimages/GRB100805A_web.jpg
GCN Circular #11057
M. C. Stroh and E. A. Hoversten (PSU) report on behalf of the Swift-XRT team:
We have analysed 3.3 ks of XRT data for GRB 100805A (Hoversten et al. GCN Circ. 11047), from 111 s to 6.7 ks after the BAT trigger. The data comprise 48 s in Windowed Timing (WT) mode (the first 8 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 11049).
The light curve can be modelled with an initial power-law decay with an index of alpha=3.6 (+0.5, -0.4), followed by a break at T+294 s to an alpha of 0.45 (+0.12, -0.23).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.97 (+0.17, -0.10). The best-fitting absorption column is 1.7 (+0.5, -0.0) x 10^21 cm^-2, in excess of the Galactic value of 1.7 x 10^21 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.1 x 10^-11 (5.7 x 10^-11) erg cm^-2 count^-1.
If the light curve continues to decay with a power-law decay index of 0.45, the count rate at T+24 hours will be 0.032 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.3 x 10^-12 (1.8 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/00430957.
This circular is an official product of the Swift-XRT team.
GCN Circular #11058
S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), E. A. Hoversten (PSU), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from recent telemetry downlinks, we report further analysis of BAT GRB 100805A (trigger #430957) (Hoversten, et al., GCN Circ. 11047). The BAT ground-calculated position is RA, Dec = 299.846, 52.618 deg, which is
```
   RA(J2000)  =  19h 59m 23.0s 
   Dec(J2000) = +52d 37' 05.8" 
```
with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 39%.
The mask-weighted light curve shows a few overlapping weak peaks starting at ~T-1 sec, peaking at ~T+2 sec, and ending at ~T+20 sec. There is a possible 3-sigma peak at ~T+60 sec. T90 (15-350 keV) is 15.0 +- 3.0 sec (estimated error including systematics).
The time-averaged spectrum from T-1.4 to T+17.1 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.76 +- 0.23. The fluence in the 15-150 keV band is 5.1 +- 0.8 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+1.97 sec in the 15-150 keV band is 0.7 +- 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/430957/BA/
GCN Circular #11060
J. Gorosabel (IAA-CSIC), M. Chioare Diaz-Martin (IAC), R. Iglesias Marzoa (Univ. of La Laguna), M. Jelinek (IAA-CSIC), report on behalf of a larger collaboration:
"We have acquired BVR-band images of the GRB 100805A (Hoversten et al. GCNC 11047) field with the 82-cm IAC80 telescope on the Observatory of Teide, Tenerife, Spain. The optical afterglow (Hoversten et al. GCNC 11047; Cenko et al. GCNC 11050, GCNC 11051; Gomboc et al. GCNC 11052; Gorosabel et al. GCNC 11054; Nissinen et al. GCNC 11056) is detected in the three optical bands with an approximate magnitude of R~19.3 on Aug. 5.2046 UT (mean observing time, ~42 minutes post burst). The calibration is based on USNO B1.0 field stars."
GCN Circular #11062
S. T. Holland (CRESST/GSFC/USRA) and E. A. Hoversten (PSU) report on the behalf of the Swift UVOT team:
The Swift/UVOT observed the field of GRB 100805A starting 112 s after the BAT trigger (Hoversten, et al., 2010, GCN Circ. 11047). Settled observations started at 130 s. We detect the optical afterglow (Hoversten, et al., 2010, GCN Circ, 11047) in all filters except uvw2. The refined UVOT position is
```
     RA (J2000) =  19:59:30.51  =  299.87713 (deg)
    Dec (J2000) = +52:37:40.1   =  +52.62783 (deg)
```
with an estimated uncertainty of 0.43 arcsec (radius, 90% confidence, statistical + systematic). This is 1.31 arcsec west of the UVOT-enhanced XRT position (Goad, et al., 2010, GCN Circ. 11053).
Preliminary magnitudes, and 3-sigma upper limits for detecting a source in the finding charts and in the co-added images, are
```
Filter      T_start   T_stop    Exp(s)      Mag   Err
-----------------------------------------------------------
white (fc)      130      280       147     18.10 0.08
    u (fc)      288      538       246     18.32 0.11

    v           619     5984       432     19.80 0.23
    b           544   10,831      1213     21.22 0.20
    u           288     6600       659     18.55 0.09
 uvw1           668     6395       432     20.78 0.39
 uvm2           643     6189       432     20.68 0.45
 uvw2           594   12,479      1149    >21.6  3-sigma UL
white           130   11,744      1319     19.42 0.07
-----------------------------------------------------------
```
The quoted magnitudes and upper limits have not been corrected for the expected Galactic extinction along the line of sight corresponding to a reddening of E_{B-V} = 0.19 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).
The non-detection in the UVOT uvw2 filter, and the observed UVOT spectral energy distribution at 4895 s, is consistent with GRB 100805A having a redshift of approximately z = 1.3, although we can not rule out the non-detection in uvw2 being due to extinction in the host galaxy. The white light curve exhibits a power-law decay with an index of alpha = -0.71 +/- 0.03, consistent with what was observed by Cenko, et al. (2010, GCN Circ. 11051).
GCN Circular #11063
S. B. Pandey and W. Zheng (U Mich), report on behalf of the ROTSE collaboration:
Further analysis of GRB 100805A data taken from ROTSE-IIIb clearly detects the optical afterglow candidate (Hoversten E. A. et al., GCN 11047) in the images taken ~50.9 s after the burst (Pandey S. B. & Zheng W., GCN 11048).
In the consecutive images taken by ROTSE, the optical afterglow show a temporal decay nature very similar to those reported by Cenko S. B. (GCN 11051) and Holland S. T. et al (GCN 11062). The optical afterglow detection by ROTSE was not reported in the previous circular (GCN 11048) due to a problem in the online data processing.
GCN Circular #11064
J. Wren, W.T. Vestrand, P.R. Wozniak, H. Davis, of Los Alamos National Laboratory report:
The RAPTOR telescope system responded to Swift trigger 430957 (Hoversten et al., GCN 11047) under fair observing conditions. Our narrow-field instruments began observing the location at 04:13:44.3 UTC, 62.2 seconds after the initial BAT trigger. At 100 seconds after the trigger, we estimate the counterpart to have magnitude R~16.7 +/- 0.3. The object fades steadily reaching R~17.4 +/- 0.3 at 200 seconds after the trigger. It appears to remain near this level for the next 150 seconds or so before resuming the fading behavior. Our unfiltered images were calibrated against the USNO-B1 R-band. Further analysis is ongoing.
GCN Circular #11065
L.P. Xin, Z. X. Ling, Y.L. Qiu, J.Y. Wei, J. Wang, J.S. Deng, C. Wu, X. H. Han, J.Y. Hu on behalf of EAFON report:
We began to observe GRB100805A (Hoversten E. A. et al., GCN 11047 ) with Xinglong TNT telescope at 12:29:52 (UT), 8.28h after the burst. Nine R band images were obtained. The exposure time for each frame is 600 sec. The afterglow (Hoversten E. A. et al., GCN 11047) with a brightness of 21.3+/-0.2 mag was detected with the combined 9*600s white-band data at the mean time of 8.95h after the burst.
The reference star is a nearby USNO-B1.0 star with a coordinates of 19:59:33.3, +52:37:54.0, and a brightness of R2=17.41 mag.
Combining TNT data and other data reported in the previous GCN circulars (Cenko, GCN 11050, GCN 11051;Gomboc et al. GCN11052; Nissinen et al. GCN 11056; Gorosabel et al. GCN 11060; Wren et al. GCN 11064 ), we infer that the brightness of OT was decaying with a power-law decay index of alpha~0.73 from 100sec to 8.9h after the burst, consistent with the reports of Cenko, GCN Circ. 11051 and Gomboc et al. GCN 10052.
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 #11066
J. Gorosabel (IAA-CSIC, Granada), M. Chioare Diaz-Martin (IAC, Obs. del T= eide, Tenerife), R. Iglesias Marzoa (Univ. of La Laguna, Tenerife), A. So= ta (IAA-CSIC, Granada), A.J. Castro-Tirado (IAA-CSIC, Granada), J.M. Cast= ro Cer=F3n (ESAC, Madrid), report on behalf of a larger collaboration:
"We observed the field of GRB 100805A (Hoversten et al., GCNC 11047) with= the 0.82m IAC80 (Obs. of Teide, Tenerife, Spain) and 1.5m OSN (Obs. of S= ierra Nevada, Granada, Spain) telescopes in VRI-bands. The observations w= ere carried out on Aug 6.0515-6.1393 UT (IAC80) and Aug 6.1608-6.1875 UT = (1.5m OSN), respectively. The optical afterglow is marginally detected in= our images with a preliminary magnitude of R~21.5, calibrated against U= SNO-B1.0 field stars."
GCN Circular #11071
A. S. Moskvitin, T. A. Fatkhullin, V. V. Sokolov, T. N. Sokolova & V. N. Komarova (SAO RAS, Niznijh Arkhyz, Russia), report:
We observed the field of the GRB100805A (Hoversten E. A. et al., GCN 11047) with the Zeiss-1000 telescope of SAO RAS, Russia. The observations were carried out in the BVRc bands on Aug. 5.843-6.033 UT. Assuming the magnitudes of the reference USNO-B1.0 star (L.P. Xin et al., GCN 11065) as B = 18.94 and R = 17.41 we estimated the brightness of the GRB100805A optical transient as:
```
B = 22.85 +/- 0.11
R = 21.43 +/- 0.10
```
Errors are formal and do not include ones of USNO-B1.0 to Johnson-Cousins photometric system transformation.
This message may be cited.
GCN Circular #11076
A. S. Moskvitin, T. A. Fatkhullin, V. V. Sokolov, T. N. Sokolova & V. N. Komarova (SAO RAS, Niznijh Arkhyz, Russia), report:
We observed the field of the GRB100805A (Hoversten E. A. et al., GCN 11047) once again with the Zeiss-1000 telescope of SAO RAS, Russia. The observations were carried out in the Rc band on Aug. 7.832 - 7.918 UT. At the position of the OT we detected a faint object with R = 23.3 +/- 0.2. We assume the magnitude of the reference USNO-B1.0 star (L. P. Xin et al., GCN 11065; A. S. Moskvitin et al., GCN 11071) as R = 17.41.
Error are formal and do not include one of USNO-B1.0 to Johnson-Cousins photometric system transformation.
This message may be cited.
GCN Circular #11077
V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 100805A (Hoversten et al., GCN 11047) with Shajn telescope of CrAO in filter R between (UT) July, 07 18:57:40 - 20:10:19 under good weather conditions and mean seeing of about 1.7". Within enhanced Swift-XRT position (Goad et al., GCN 11053) we do not detect the afterglow (Cenko, GCN 11050). However we detect the object in coordinates (J2000) RA: 19 59 30.11 Dec: +52 37 37.79. The object is 5.6" away from the center of enhanced XRT position (Goad et al., GCN 11053) and about 4.5" from afterglow position (Cenko, GCN 11050; Holland et al, GCN 11062). The object could be a host galaxy of GRB 100805A.
The photometry is based on USNO-B1.0 star 1426-0390273 (J2000) RA= 19 59 29.55 +52 37 19.6 Dec= +52 37 19.6 and assuming R=17.59 is following:
```
T0+      Filter,   Exposure, Obj. mag.,  Upper Limit
(mid, d)              (s)

2.6401  R       68x60     22.5  +/- 0.1             24.0
```
The combined images can be found http://grb.rssi.ru/GRB100805A/GRB100805a_100807_R_ZTSh.gif
Our observation and photometry is in some contradiction with observation reported in GCN 11076 (Moskvitin et al.)
GCN Circular #11079
A. S. Moskvitin, T. A. Fatkhullin, V. V. Sokolov, T. N. Sokolova & V. N. Komarova (SAO RAS, Niznijh Arkhyz, Russia), report:
We performed the third epoch of observations of the GRB 100805A (Hoversten E. A. et al., GCN 11047) field with the Zeiss-1000 telescope of SAO RAS, Russia. The observations were carried out in the Rc band on Aug. 9.882 - 10.043 UT under good weather conditions and the seeing 1".7.
At the position of OT we detected an object with R = 23.54 +/- 0.22.
We assume the magnitude of the reference USNO-B1.0 star (L. P. Xin et al., GCN 11065; A. S. Moskvitin et al., GCN 11071, A. S. Moskvitin et al., GCN 11076) as R = 17.41.
Also we estimate the magnitude of the source reported by V. Rumyantsev and A. Pozanenko (GCN 11077) as R = 22.31 +/- 0.08 according to their standard star with R=17.59. All errors are formal and they do not include errors of the USNO-B1.0 to Johnson-Cousins photometric system transformation.
Images from all 3 epochs with the marked OT and nearby object (GCN 11077) can be found in ftp://ftp.sao.ru/pub/grb/GRB100805A/GRB100805A_Zeiss1000.jpeg
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GCN Circular #11081
S. T. Holland (CRESST/USRA/GSFC) and E. A. Hoversten (PSU) report on the behalf of the Swift UVOT team:
Swift/UVOT observations of the optical afterglow of GRB 100805A (Hoversten, et al., 2010, GCN Circ, 11047) suggest that the afterglow may have brightened in the UVOT white band between approximately 1 day and 6 days after the BAT trigger. This may indicate the presence of a supernova component in the light curve. Our analysis is complicated by the presence of several bright stars near the optical afterglow. Further observations are needed to confirm that this possible brightening is real. Follow-up observations of this source are strongly encouraged.
GCN Circular #11083
V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 100805A (Hoversten et al., GCN 11047) with Shajn telescope of CrAO in filter R in two epochs Aug. 07 and Aug 08. After revision of our first epoch observation reported in GCN 11077 (Rumyantsev et al.) we do find the afterglow (Cenko, GCN 11050). Our photometry (see below) is compatible with photometry reported for approximately the same epoch observation (Moskvitin et al. GCN 11076). We thank to C.Guidorzi for mention of inconsistency of our results reported in GCN 11077.
Coordinates of the afterglow is following
```
Aug. 07 (J2000) RA:  19 59 30.49 Dec: +52 37 40.3
Aug. 08 (J2000) RA:  19 59 30.47 Dec: +52 37 39.6
```
The coordinates are compatible within error bars with afterglow coordinates (Cenko, GCN 11050; Holland et al, GCN 11062).
The photometry is based on USNO-B1.0 star 1426-0390273 (J2000) RA= 19 59 29.55 +52 37 19.6 Dec= +52 37 19.6 and assuming R=17.59 is following:
```
T0+      Filter,   Exposure, OT. mag.,  Upper Limit
(mid, d)              (s)

2.6401  R       68x60     23.6 +/- 0.25            24.0
3.6417  R      101x60     23.3 +/- 0.15            24.3
```
The combined images can be found http://grb.rssi.ru/GRB100805A/GRB100805a_100808_R_ZTSh.gif
Taken together late time photometry above and (Moskvitin et al., GCN 11076; Moskvitin et al., GCN 11079) one can suggest flattening of the light curve in R-filter in 2.5 - 4.5 days after burst trigger. However some re-brightening suggested by Holland & Hoversten (GCN 11081) could not be excluded in this period too.
GCN Circular #11084
A. S. Moskvitin, T. A. Fatkhullin, V. V. Sokolov, T. N. Sokolova & V. N. Komarova (SAO RAS, Niznijh Arkhyz, Russia), report:
We performed further observations of the GRB100805A (Hoversten E. A. et al., GCN 11047) field with the Zeiss-1000 telescope of SAO RAS, Russia. The observations were carried out in the Rc band on Aug. 12.821 - 13.046 UT under good transparency and seeing of 2".5. Total integration time is 15600 sec.
We do not detect any objects at the position of the OT up to limiting magnitude R = 24.2 (3-sigma limit for stellar-like object).
We assumed the magnitude of the reference USNO-B1.0 star (L. P. Xin et al., GCN 11065; A. S. Moskvitin et al., GCN 11071, A. S. Moskvitin et al., GCN 11076, A. S. Moskvitin et al., GCN 11079) as R = 17.41.
Also we confirm the magnitude of the source reported by V. Rumyantsev and A. Pozanenko (GCN 11077) as R = 22.47 +/- 0.06 according to their standard star with R=17.59. All errors are formal and they do not include errors of the USNO-B1.0 to Johnson-Cousins photometric system transformation.
Combining all data in the R-band we found that late-time light curve (T-T_0 > 2.3 days) behaviour follows the one of the early stage (F ~ t^-0.77, t < 3000 sec). Thus one can conclude that possible re-brightening (Holland & Hoversten (GCN 11081)) occurred within ~0.3-2.3 days after the burst. The R-band light curve can be found at ftp://ftp.sao.ru/pub/grb/GRB100805A/GRB100805A_lc_R.jpeg
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GCN Report 298.1
GCN_Report 298.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_298_1.pdf by E.A. Hoversten at PSU titled: "Final report on Swift Observations of GRB 100805A"

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Jochen Greiner, last update: 05-Aug-2010 [Disclaimer]