Gamma-ray Burst 120819A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 19 Aug 12 13:11:43 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     531428,   Seg_Num: 0
GRB_RA:          235.888d {+15h 43m 33s} (J2000),
                 236.057d {+15h 44m 14s} (current),
                 235.218d {+15h 40m 52s} (1950)
GRB_DEC:          -7.305d {-07d 18' 16"} (J2000),
                  -7.344d {-07d 20' 38"} (current),
                  -7.147d {-07d 08' 49"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=1466 [image_cnts]
TRIGGER_DUR:     72.000 [sec] 
TRIGGER_INDEX:   20000     E_range: 15-50 keV
BKG_INTEN:       0 [cnts]
BKG_TIME:        0.00 SOD {00:00:00.00} UT
BKG_DUR:         0 [sec]
GRB_DATE:        16158 TJD;   232 DOY;   12/08/19
GRB_TIME:        47414.44 SOD {13:10:14.44} UT
GRB_PHI:         -63.66 [deg]
GRB_THETA:        36.03 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    7.61 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  -2  +0  +0  -3  +0 
SUN_POSTN:       149.16d {+09h 56m 39s}  +12.53d {+12d 31' 43"}
SUN_DIST:         88.58 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      169.87d {+11h 19m 30s}   -0.79d {-00d 47' 12"}
MOON_DIST:        66.28 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      359.68, 35.97 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      235.32, 12.12 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 139.85,7.41 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 19 Aug 12 13:13:01 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     531428,   Seg_Num: 0
POINT_RA:        235.913d {+15h 43m 39s} (J2000)
POINT_DEC:        -7.316d {-07d 18' 58"} (J2000)
IMG_START_DATE:  16158 TJD;   232 DOY;   12/08/19
IMG_START_TIME:  47570.56 SOD {13:12:50.56} UT,   156.1 [sec] since BAT Trigger Time
COUNTS:          9    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:     Sun 19 Aug 12 13:14:33 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     531428,   Seg_Num: 0
GRB_RA:          235.888d {+15h 43m 33s} (J2000),
                 236.057d {+15h 44m 14s} (current),
                 235.218d {+15h 40m 52s} (1950)
GRB_DEC:          -7.305d {-07d 18' 16"} (J2000),
                  -7.344d {-07d 20' 38"} (current),
                  -7.147d {-07d 08' 49"} (1950)
GRB_DATE:        16158 TJD;   232 DOY;   12/08/19
GRB_TIME:        47414.44 SOD {13:10:14.44} UT
TRIGGER_INDEX:   20000
GRB_PHI:         -63.66 [deg]
GRB_THETA:        36.03 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     72.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    7.61 [sigma]
LC_URL:          sw00531428000msb.lc
SUN_POSTN:       149.17d {+09h 56m 40s}  +12.53d {+12d 31' 40"}
SUN_DIST:         88.58 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      169.90d {+11h 19m 36s}   -0.80d {-00d 47' 48"}
MOON_DIST:        66.26 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      359.68, 35.97 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      235.32, 12.12 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is an image trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 139.85,7.41 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 19 Aug 12 13:15:45 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     531428,   Seg_Num: 0
POINT_RA:        235.914d {+15h 43m 39s} (J2000)
POINT_DEC:        -7.317d {-07d 18' 59"} (J2000)
POINT_ROLL:      282.848d
IMG_START_DATE:  16158 TJD;   232 DOY;   12/08/19
IMG_START_TIME:  47572.82 SOD {13:12:52.82} UT,   158.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.245
N_STARS:         39
X_OFFSET:        687 [pixels]
Y_OFFSET:        487 [pixels]
X_MAX:           1646 [pixels]
Y_MAX:           1446 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00531428000msufc0158.fits
SUN_POSTN:       149.17d {+09h 56m 40s}  +12.53d {+12d 31' 39"}
SUN_DIST:         88.61 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      169.91d {+11h 19m 38s}   -0.80d {-00d 48' 03"}
MOON_DIST:        66.27 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      359.69, 35.94 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      235.35, 12.12 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 19 Aug 12 13:16:16 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     531428,   Seg_Num: 0
POINT_RA:        235.914d {+15h 43m 39s} (J2000)
POINT_DEC:        -7.317d {-07d 18' 59"} (J2000)
POINT_ROLL:      282.848d
IMG_START_DATE:  16158 TJD;   232 DOY;   12/08/19
IMG_START_TIME:  47572.82 SOD {13:12:52.82} UT,   158.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.245
N_STARS:         39
X_OFFSET:        687 [pixels]
Y_OFFSET:        487 [pixels]
X_MAX:           1646 [pixels]
Y_MAX:           1446 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00531428000msufc0158.fits
SUN_POSTN:       149.17d {+09h 56m 40s}  +12.53d {+12d 31' 39"}
SUN_DIST:         88.61 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      169.91d {+11h 19m 39s}   -0.80d {-00d 48' 10"}
MOON_DIST:        66.27 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      359.69, 35.94 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      235.35, 12.12 [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:     Sun 19 Aug 12 13:17:13 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     531428,   Seg_Num: 0
POINT_RA:        235.914d {+15h 43m 39s} (J2000)
POINT_DEC:        -7.317d {-07d 18' 59"} (J2000)
ROLL:            282.848d
IMG_START_DATE:  16158 TJD;   232 DOY;   12/08/19
IMG_START_TIME:  47572.82 SOD {13:12:52.82} UT,   158.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     367074782
X_OFFSET:        1006 [pixels]
Y_OFFSET:        806 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1166
Y_GRB_POS:       966
BINNING_INDEX:   1
IM_URL:          sw00531428000msuni0168.fits
SUN_POSTN:       149.17d {+09h 56m 40s}  +12.53d {+12d 31' 38"}
SUN_DIST:         88.61 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      169.92d {+11h 19m 41s}   -0.81d {-00d 48' 22"}
MOON_DIST:        66.26 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      359.69, 35.94 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      235.35, 12.12 [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:     Sun 19 Aug 12 13:17:34 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     531428,   Seg_Num: 0
POINT_RA:        236.588d {+15h 46m 21s} (J2000)
POINT_DEC:        -7.751d {-07d 45' 03"} (J2000)
POINT_ROLL:      282.611d
IMG_START_DATE:  16158 TJD;   232 DOY;   12/08/19
IMG_START_TIME:  47730.76 SOD {13:15:30.76} UT,   316.3 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.001
N_STARS:         0
X_OFFSET:        447 [pixels]
Y_OFFSET:        247 [pixels]
X_MAX:           1886 [pixels]
Y_MAX:           1686 [pixels]
DET_THRESH:      2
PHOTO_THRESH:    2
SL_URL:          sw00531428000msufc0316.fits
SUN_POSTN:       149.17d {+09h 56m 40s}  +12.53d {+12d 31' 38"}
SUN_DIST:         89.36 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      169.93d {+11h 19m 42s}   -0.81d {-00d 48' 26"}
MOON_DIST:        66.94 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      359.83, 35.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      236.12, 11.84 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 19 Aug 12 13:17:37 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     531428,   Seg_Num: 0
POINT_RA:        235.914d {+15h 43m 39s} (J2000)
POINT_DEC:        -7.317d {-07d 18' 59"} (J2000)
ROLL:            282.848d
IMG_START_DATE:  16158 TJD;   232 DOY;   12/08/19
IMG_START_TIME:  47572.82 SOD {13:12:52.82} UT,   158.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     367074782
X_OFFSET:        1006 [pixels]
Y_OFFSET:        806 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1166
Y_GRB_POS:       966
BINNING_INDEX:   1
IM_URL:          sw00531428000msuni0168.fits
SUN_POSTN:       149.17d {+09h 56m 40s}  +12.53d {+12d 31' 38"}
SUN_DIST:         88.61 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      169.93d {+11h 19m 42s}   -0.81d {-00d 48' 27"}
MOON_DIST:        66.25 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      359.69, 35.94 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      235.35, 12.12 [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:     Sun 19 Aug 12 13:17:41 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     531428,   Seg_Num: 0
GRB_RA:          235.9084d {+15h 43m 38.01s} (J2000),
                 236.0778d {+15h 44m 18.66s} (current),
                 235.2387d {+15h 40m 57.29s} (1950)
GRB_DEC:          -7.3090d {-07d 18' 32.4"} (J2000),
                  -7.3483d {-07d 20' 54.0"} (current),
                  -7.1516d {-07d 09' 05.7"} (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:  16158 TJD;   232 DOY;   12/08/19
IMG_START_TIME:  47635.00 SOD {13:13:55.00} UT,   220.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       149.17d {+09h 56m 40s}  +12.53d {+12d 31' 38"}
SUN_DIST:         88.60 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      169.93d {+11h 19m 42s}   -0.81d {-00d 48' 28"}
MOON_DIST:        66.25 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      359.69, 35.95 [deg] galactic lon,lat of the burst
ECL_COORDS:      235.34, 12.12 [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 0.11% < P(seren) < 0.58%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 19 Aug 12 13:18:45 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     531428,   Seg_Num: 0
POINT_RA:        236.588d {+15h 46m 21s} (J2000)
POINT_DEC:        -7.751d {-07d 45' 03"} (J2000)
ROLL:            282.611d
IMG_START_DATE:  16158 TJD;   232 DOY;   12/08/19
IMG_START_TIME:  47730.76 SOD {13:15:30.76} UT,   316.3 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     367074940
X_OFFSET:        1006 [pixels]
Y_OFFSET:        806 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1166
Y_GRB_POS:       966
BINNING_INDEX:   1
IM_URL:          sw00531428000msuni0326.fits
SUN_POSTN:       149.17d {+09h 56m 40s}  +12.53d {+12d 31' 37"}
SUN_DIST:         89.35 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      169.94d {+11h 19m 45s}   -0.81d {-00d 48' 41"}
MOON_DIST:        66.93 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      359.83, 35.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      236.12, 11.84 [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:     Sun 19 Aug 12 13:19:01 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     531428,   Seg_Num: 0
POINT_RA:        236.588d {+15h 46m 21s} (J2000)
POINT_DEC:        -7.751d {-07d 45' 03"} (J2000)
ROLL:            282.611d
IMG_START_DATE:  16158 TJD;   232 DOY;   12/08/19
IMG_START_TIME:  47730.76 SOD {13:15:30.76} UT,   316.3 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     367074940
X_OFFSET:        1006 [pixels]
Y_OFFSET:        806 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1166
Y_GRB_POS:       966
BINNING_INDEX:   1
IM_URL:          sw00531428000msuni0326.fits
SUN_POSTN:       149.17d {+09h 56m 40s}  +12.53d {+12d 31' 37"}
SUN_DIST:         89.35 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      169.94d {+11h 19m 45s}   -0.81d {-00d 48' 45"}
MOON_DIST:        66.93 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      359.83, 35.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      236.12, 11.84 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN Circular #13681
A. P. Beardmore (U Leicester), S. D. Barthelmy (GSFC), J. R. Cummings (NASA/UMBC), N. Gehrels (NASA/GSFC), F. E. Marshall (NASA/GSFC), C. J. Mountford (U Leicester), C. Pagani (U Leicester) and K. L. Page (U Leicester) report on behalf of the Swift Team:
At 13:10:14 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 120819A (trigger=531428). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 235.888, -7.305 which is
```
   RA(J2000)  =  15h 43m 33s
   Dec(J2000) = -07d 18' 16"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows several peaks with a duration of about 30 sec. The peak count rate was ~1600 counts/sec (15-350 keV), at ~5 sec after the trigger.
The XRT began observing the field at 13:12:50.5 UT, 156.2 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 235.90848, -7.30910 which is equivalent to:
```
   RA(J2000)  = 15h 43m 38.04s
   Dec(J2000) = -07d 18' 32.8"
```
with an uncertainty of 3.8 arcseconds (radius, 90% containment). This location is 74 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. 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 in excess of the Galactic value (8.93 x 10^20 cm^-2, Kalberla et al. 2005), with an excess column of 3.4 (+2.74/-2.85) x 10^21 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 158 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 77% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.17.
Burst Advocate for this burst is A. P. Beardmore (apb AT star.le.ac.uk). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular #13682
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk
K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University
E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina, N.Shatskiy, P.Balanutsa, D.Zimnukhov, A.Kuznetsov, V.V.Chazov, A.Kuznetsov, A.Sankovich Sternberg Astronomical Institute, Moscow State University
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
V.Krushinski, I.Zalozhnih, A. Popov Ural Federal University, Kourovka
Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA)
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Blagoveschensk was pointed to the GRB120819A (Beardmore et al., GCN 13681) sec after GRB time at 2012-08-19 13:12:10.052 UT. On our first (20s exposure) set we haven`t found optical transient within SWIFT error-box. The 5-sigma upper limit has been about 16.5 mag The reduction is continuated. The message may be cited.
GCN Circular #13683
D. Malesani (DARK/NBI), G. Leloudas (OKC Stockholm and DARK/NBI), D. Xu (WIS), J. P. U. Fynbo (DARK/NBI), P. Jakobsson (Univ. Iceland), S. Geier (NOT and DARK/NBI) report on behalf of a larger collaboration:
We observed the field of GRB 120819A (Beardmore et al., GCN 16381) with the NOT equipped with ALFOSC. Observations were carried out in the R and z bands, for a total of 20 and 40 min exposure, respectively.
Within the current XRT position (see http://www.swift.ac.uk/xrt_positions/index.php), we detect a source at the following coordinates (J2000):
```
RA = 15:43:37.84
Dec = -07:18:32.9
```
with an error of about 0.5". Assuming R = 18.05 for the nearby USNO star at RA = 15:43:38.183, Dec = -07:17:51.72, the object has R = 23.0 +- 0.1. The mean time of the R-band observation is Aug 19.913 UT, that is 8.75 hr after the GRB.
Given the faintness of the source and the lack of information on its temporal behaviour, we cannot state whether this object is related to GRB 120819A.
GCN Circular #13684
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 2836 s of XRT Photon Counting mode data and 3 UVOT images for GRB 120819A, 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 = 235.90756, -7.30909 which is equivalent to:
```
RA (J2000): 15h 43m 37.81s
Dec (J2000): -07d 18' 32.7"
```
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 #13685
D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 120819A (Beardmore et al., GCNC 13681) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory.
The observation started on 2012-08-19 13:12:11 UT (~2.0 min after the burst) We did not find any new point source within the enhanced XRT circle (Beardmore et al., GCNC 13681) in all the three bands. We also could not detect the previously reported afterglow (Malesani et al., GCNC 13683).
Three sigma upper limits of the OT are listed below. We used GSC2.3 catalog for flux calibration.
```
T0+[day]   MID-UT   T-EXP[sec]    g'     Rc     Ic
------------------------------------------------------
0.01186    13:27:19    1620.0   >19.1  >19.4  >18.8
------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
```
GCN Circular #13686
D. Kuroda (OAO, NAOJ), H. Hanayama, T. Miyaji, J. Watanabe (IAO, NAOJ), K. Yanagisawa (OAO, NAOJ), S.Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 120819A (Beardmore et al., GCNC 13681) with the optical three color (g', Rc and Ic) CCD camera attached to the Murikabushi 1m telescope of Ishigakijima Astronomical Observatory.
The observation started on 2012-08-19 13:13:11 UT, (~3.0 min after the burst) We did not find any new point source within the enhanced XRT circle (Beardmore et al., GCNC 13681) in all the three bands. We also could not detect the previously reported afterglow (Malesani et al., GCNC 13683).
Three sigma upper limits of the OT are listed below. We used GSC2.3 catalog for flux calibration.
```
T0+[day]   MID-UT   T-EXP[sec]    g'     Rc     Ic
------------------------------------------------------
0.01544    13:32:28    1980.0   >21.5  >21.6  >20.3
------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
```
GCN Circular #13687
O.M. Littlejohns (U. Leicester), V. D'Elia (ASDC), A. Maselli (INAF-IASFPA), V. Mangano (INAF-IASFPA), D.N. Burrows (PSU), J.A. Kennea (PSU), M.C. Stroh (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester) and A.P. Beardmore report on behalf of the Swift-XRT team:
We have analysed 10 ks of XRT data for GRB 120819A (Beardmore et al. GCN Circ. 13681), from 159 s to 23.0 ks after the BAT trigger. The data comprise 67 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN. Circ 13684).
The light curve can be modelled with a power-law decay with a decay index of alpha=1.75 (+0.12, -0.09).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.7 (+/-0.4). The best-fitting absorption column is 3.3 (+2.0, -1.5) x 10^21 cm^-2, in excess of the Galactic value of 8.9 x 10^20 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.2 x 10^-11 (6.0 x 10^-11) erg cm^-2 count^-1.
A summary of the WT-mode spectrum is thus:
```
Total column:	     3.3 (+2.0, -1.5) x 10^21 cm^-2
Galactic foreground: 8.9 x 10^20 cm^-2
Excess significance: 2.6 sigma
Photon index:	     1.7 (+/-0.4)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00531428.
This circular is an official product of the Swift-XRT team.
GCN Circular #13688
V. Sudilovsky (MPE Garching), S. Klose (TLS Tautenburg), and J. Greiner (MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 120819A (Swift trigger 531428; Beardmore et al., GCN 13681) simultaneously in g'r'i'z'JHKs with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG/ESO telescope at La Silla Observatory (Chile).
Observations started at 23:46 UT on 2012-08-19, 10.5 hrs after the GRB trigger. Based on co-added images spanning 2 hours taken at a mean airmass of 1.3 and seeing of 1.6", we confirm the presence of the NOT afterglow candidate (Malesani et al., GCN 13683). We derive preliminary magnitudes (all AB system) of this source:
```
   g' = 23.7 +- 0.1
   r' = 23.1 +- 0.1
   i' = 22.5 +- 0.1
   z' = 22.2 +- 0.1
   J  = 21.5 +- 0.3
   H  > 20.2
   Ks > 20.1
```
We note that although these magnitudes do not suggest fading, the large uncertainties from the USNO calibration used by Malesani et al. do not preclude this possibility.
The consistency with the enhanced XRT position (Evans et al., GCN 13684), combined with the power-law like SED, confirm that this source is the afterglow of GRB 120819A.
The g' band detection does not suggest substantial Ly-alpha or dust effects, implying that the redshift of this burst is likely smaller than 3.0.
The magnitudes are derived based on GROND zeropoints (g'r'i'z') and 2MASS stars (JHK). The magnitudes are not corrected for the expected Galactic reddening along the line of sight of E_(B-V)= 0.16 mag (Schlegel et al. 1998).
GCN Circular #13689
T. Sakamoto (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (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 120819A (trigger #531428) (Beardmore, et al., GCN Circ. 13681). The BAT ground-calculated position is RA, Dec = 235.887, -7.304 deg, which is
```
   RA(J2000)  =  15h 43m 32.8s 
   Dec(J2000) = -07d 18' 13.5" 
```
with an uncertainty of 2.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 30%.
The mask-weighted light curve shows multiple peaks starting at ~T-2 sec, with the largest peak at ~T+0 sec, and returning to baseline at ~T+180 sec. T90 (15-350 keV) is 71 +- 21 sec (estimated error including systematics).
The time-averaged spectrum from T+4.42 to T+82.88 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.49 +- 0.23. The fluence in the 15-150 keV band is 1.4 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+6.20 sec in the 15-150 keV band is 0.8 +- 0.3 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/531428/BA/
GCN Circular #13690
U.Quadri, L.Strabla, R.Girelli and A.Quadri report:
We imaged the field of GRB 120819A detected by SWIFT(trigger 531428) with the robotic telescope of (IAU station 565) Bassano Bresciano Observatory, Italy.
The observations started 6h 35min. after the GRB trigger(delay due to expecting the night) with our Schmidt telescope D=400mm F/D=3.1.
Weather conditions were good.
We co-added 2 series of 15 unfiltered CCD exposures of 120s each.
We did not appear any reasonable optical counterpart in the error box of the XRTcandidate (Beardmore et al., GCNC 13681) at our limiting magnitude.
```
Start      End       M.lim.
395min     454min    19.5
```
Magnitudes were estimated with the USNO-B1 cat.
The message may be cited.
GCN Circular #13691
E. Gorbovskoy, D.Denisenko, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski,N.Tyurina, N.Shatskiy, P.Balanutsa, D.Zimnukhov, A.Kuznetsov, V.V.Chazov Sternberg Astronomical Institute, Moscow State University
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk
K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
V.Krushinski, I.Zalozhnih, A. Popov Ural Federal University, Kourovka
Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA)
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Blagoveschensk was pointed to the GRB120819A (Beardmore et al., GCN 13681) 25 sec after notice time and 115 sec after GRB time at 2012-08-19 13:12:10.052 UT (Yurkov et. al, GCN 13682).
Unfiltered observations were carried out on high zenith distance (78 deg. at the observations beginning moment and above). The unfiltered magnitude is calibrated relative to USNO B1.0 (0.8 R + 0.2 B). After the data processing we have the following results:
```
             Start      Middle    Stop    T-Tgrb Coadd Exp.time  Limit
2012-08-19 13:12:10  13:12:20  13:12:30    125     1       20   16.5
2012-08-19 13:12:10  13:15:00  13:17:51    285     6      140   17.8
2012-08-19 13:19:08  13:39:35  14:00:02   1785    10     1800   18.5
```
The message may be cited.
GCN Circular #13702
F. E. Marshall (NASA/GSFC) and A. P. Beardmore (U. Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 120819A 158 s after the BAT trigger (Beardmore et al., GCN Circ. 13681). No optical afterglow consistent with the optical position (Malesani et al. GCN Circ. 13683) 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           158          308          147         >21.1
white              158         5439          541         >21.7
v                 4214        22619         1278         >20.9
b                 3598        11864         1164         >21.1
u                 4829        17638         1858         >21.6
w1                4625        16836         1998         >21.4
m2                4418        22980         1629         >21.7
w2                4009        21706         1279         >21.8
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.17 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #13713
Yu. Krugly, V. Chiorny (Institute of Astronomy of Kharkiv National University), A. Volnova (SAI MSU), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger collaboration:
We observed the afterglow of GRB 120819A (Beardmore et al. GCN 13681) with 0.7m telescope of Institute of Astronomy, Kharkiv National Univ. starting on Aug. 19 (UT) 18:27:41. A set of images were taken in R-filter. We do not detect optical afterglow (Malesani et al. GCN 13683; Sudilovsky et al.GCN 13688). The photometry is based on the nearby USNO-B1.0 (R2) stars:
```
   T0+,      Filter   Exposure,  OT,   UL (3 sigma)
 mid, d                  (s)

0.22102    R        2160          n/d    20.3
```
GCN Report 395.1
GCN_Report 395.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_395_1.pdf by A.P. Beardmore at U. Leicester titled: "Swift Observations of GRB 120819A"

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Jochen Greiner, last update: 04-Sep-2012 [Disclaimer]