Gamma-ray Burst 130206A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 06 Feb 13 19:37:09 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     547918,   Seg_Num: 0
GRB_RA:          140.375d {+09h 21m 30s} (J2000),
                 140.468d {+09h 21m 52s} (current),
                 140.020d {+09h 20m 05s} (1950)
GRB_DEC:         -58.160d {-58d 09' 36"} (J2000),
                 -58.217d {-58d 12' 59"} (current),
                 -57.947d {-57d 56' 46"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       9064 [cnts]    Image_Peak=273 [image_cnts]
TRIGGER_DUR:     2.048 [sec] 
TRIGGER_INDEX:   473     E_range: 25-100 keV
BKG_INTEN:       88404 [cnts]
BKG_TIME:        70557.81 SOD {19:35:57.81} UT
BKG_DUR:         24 [sec]
GRB_DATE:        16329 TJD;    37 DOY;   13/02/06
GRB_TIME:        70588.59 SOD {19:36:28.59} UT
GRB_PHI:          36.84 [deg]
GRB_THETA:        30.62 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     14.35 [sigma]
IMAGE_SIGNIF:    8.15 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +2  -2  +0  +1 +28  +0 
SUN_POSTN:       320.62d {+21h 22m 29s}  -15.38d {-15d 22' 41"}
SUN_DIST:        106.40 [deg]   Sun_angle= -12.0 [hr] (East of Sun)
MOON_POSTN:      271.28d {+18h 05m 07s}  -20.16d {-20d 09' 28"}
MOON_DIST:        91.73 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      278.06, -5.82 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      184.12,-65.96 [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 = 187.11,-11.79 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(2.0<100sec) coincident with the FERMI_GBM event (trignum=381872193).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 06 Feb 13 19:36:37 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     381872193
GRB_RA:          149.433d {+09h 57m 44s} (J2000),
                 149.541d {+09h 58m 10s} (current),
                 149.024d {+09h 56m 06s} (1950)
GRB_DEC:         -58.517d {-58d 31' 00"} (J2000),
                 -58.580d {-58d 34' 45"} (current),
                 -58.277d {-58d 16' 38"} (1950)
GRB_ERROR:       17.62 [deg radius, statistical plus systematic]
GRB_INTEN:       68 [cnts/sec]
DATA_SIGNIF:     4.50 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        16329 TJD;    37 DOY;   13/02/06
GRB_TIME:        70590.45 SOD {19:36:30.45} UT
GRB_PHI:         280.00 [deg]
GRB_THETA:        15.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      1.08
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      98%  GRB
2nd_MOST_LIKELY:   1%  Generic SGR
DETECTORS:       0,0,0, 1,0,0, 1,0,0, 0,0,0, 0,0,
SUN_POSTN:       320.62d {+21h 22m 29s}  -15.38d {-15d 22' 42"}
SUN_DIST:        105.68 [deg]   Sun_angle= 11.4 [hr] (West of Sun)
MOON_POSTN:      271.27d {+18h 05m 06s}  -20.16d {-20d 09' 30"}
MOON_DIST:        87.90 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      281.86, -2.94 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      192.00,-62.63 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 129.88,-6.97 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 06 Feb 13 19:36:43 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     381872193
GRB_RA:            1.050d {+00h 04m 12s} (J2000),
                   1.218d {+00h 04m 52s} (current),
                   0.408d {+00h 01m 38s} (1950)
GRB_DEC:         +20.400d {+20d 23' 60"} (J2000),
                 +20.473d {+20d 28' 23"} (current),
                 +20.122d {+20d 07' 18"} (1950)
GRB_ERROR:       6.32 [deg radius, statistical only]
DATA_SIGNIF:     5.00 [sigma]
DATA_INTERVAL:   0.512 [sec]
GRB_DATE:        16329 TJD;    37 DOY;   13/02/06
GRB_TIME:        70590.45 SOD {19:36:30.45} UT
GRB_PHI:         311.00 [deg]
GRB_THETA:       149.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       320.62d {+21h 22m 29s}  -15.38d {-15d 22' 42"}
SUN_DIST:         53.62 [deg]   Sun_angle= -2.7 [hr] (East of Sun)
MOON_POSTN:      271.28d {+18h 05m 06s}  -20.16d {-20d 09' 29"}
MOON_DIST:        96.87 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      108.18,-41.11 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        9.36, 18.24 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 06 Feb 13 19:40:07 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     547918,   Seg_Num: 0
GRB_RA:          140.375d {+09h 21m 30s} (J2000),
                 140.468d {+09h 21m 52s} (current),
                 140.020d {+09h 20m 05s} (1950)
GRB_DEC:         -58.160d {-58d 09' 36"} (J2000),
                 -58.217d {-58d 12' 59"} (current),
                 -57.947d {-57d 56' 46"} (1950)
GRB_DATE:        16329 TJD;    37 DOY;   13/02/06
GRB_TIME:        70588.59 SOD {19:36:28.59} UT
TRIGGER_INDEX:   473
GRB_PHI:          36.84 [deg]
GRB_THETA:        30.62 [deg]
DELTA_TIME:      -37.00 [sec]
TRIGGER_DUR:     2.048 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     14.35 [sigma]
IMAGE_SIGNIF:    8.15 [sigma]
LC_URL:          sw00547918000msb.lc
SUN_POSTN:       320.62d {+21h 22m 30s}  -15.38d {-15d 22' 39"}
SUN_DIST:        106.41 [deg]   Sun_angle= -12.0 [hr] (East of Sun)
MOON_POSTN:      271.31d {+18h 05m 15s}  -20.16d {-20d 09' 20"}
MOON_DIST:        91.75 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      278.06, -5.82 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      184.12,-65.96 [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 = 187.11,-11.79 [deg].

GCN Circular #14181
M. De Pasquale (UCL-MSSL), N. Gehrels (NASA/GSFC), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), S. R. Oates (UCL-MSSL), D. M. Palmer (LANL), B. Sbarufatti (INAF-OAB/PSU), M. H. Siegel (PSU), M. Stamatikos (OSU/NASA/GSFC) and V. N. Yershov (UCL-MSSL) report on behalf of the Swift Team:
At 19:36:28 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 130206A (trigger=547918). The BAT on-board calculated location is RA, Dec 140.375, -58.160 which is
```
   RA(J2000) = 09h 21m 30s
   Dec(J2000) = -58d 09' 36"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a total duration of about 50 sec. The peak count rate was ~2500 counts/sec (15-350 keV), at ~4 sec after the trigger.
Due to an observing constraint, Swift will not slew until T0+48.5 minutes. There will be no XRT or UVOT data until this time.
Burst Advocate for this burst is M. De Pasquale (mdp AT mssl.ucl.ac.uk). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 06 Feb 13 20:27:56 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     547918,   Seg_Num: 0
POINT_RA:        140.354d {+09h 21m 25s} (J2000)
POINT_DEC:       -58.156d {-58d 09' 21"} (J2000)
IMG_START_DATE:  16329 TJD;    37 DOY;   13/02/06
IMG_START_TIME:  73666.29 SOD {20:27:46.29} UT,   3077.7 [sec] since BAT Trigger Time
COUNTS:          1    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        0    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:     Wed 06 Feb 13 20:30:52 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     547918,   Seg_Num: 0
POINT_RA:        140.354d {+09h 21m 25s} (J2000)
POINT_DEC:       -58.156d {-58d 09' 22"} (J2000)
POINT_ROLL:      180.289d
IMG_START_DATE:  16329 TJD;    37 DOY;   13/02/06
IMG_START_TIME:  73669.48 SOD {20:27:49.48} UT,   3080.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.039
N_STARS:         190
X_OFFSET:        463 [pixels]
Y_OFFSET:        448 [pixels]
X_MAX:           1422 [pixels]
Y_MAX:           1407 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    8
SL_URL:          sw00547918000msufc3080.fits
SUN_POSTN:       320.66d {+21h 22m 38s}  -15.37d {-15d 22' 00"}
SUN_DIST:        106.42 [deg]   Sun_angle= -12.0 [hr] (East of Sun)
MOON_POSTN:      271.86d {+18h 07m 26s}  -20.12d {-20d 06' 59"}
MOON_DIST:        92.00 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      278.05, -5.83 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      184.09,-65.97 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 06 Feb 13 20:31:30 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     547918,   Seg_Num: 0
POINT_RA:        140.354d {+09h 21m 25s} (J2000)
POINT_DEC:       -58.156d {-58d 09' 22"} (J2000)
POINT_ROLL:      180.289d
IMG_START_DATE:  16329 TJD;    37 DOY;   13/02/06
IMG_START_TIME:  73669.48 SOD {20:27:49.48} UT,   3080.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.039
N_STARS:         190
X_OFFSET:        463 [pixels]
Y_OFFSET:        448 [pixels]
X_MAX:           1422 [pixels]
Y_MAX:           1407 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    8
SL_URL:          sw00547918000msufc3080.fits
SUN_POSTN:       320.66d {+21h 22m 38s}  -15.37d {-15d 21' 59"}
SUN_DIST:        106.42 [deg]   Sun_angle= -12.0 [hr] (East of Sun)
MOON_POSTN:      271.86d {+18h 07m 27s}  -20.12d {-20d 06' 57"}
MOON_DIST:        92.00 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      278.05, -5.83 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      184.09,-65.97 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 06 Feb 13 20:32:30 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     547918,   Seg_Num: 0
POINT_RA:        140.354d {+09h 21m 25s} (J2000)
POINT_DEC:       -58.156d {-58d 09' 22"} (J2000)
ROLL:            180.289d
IMG_START_DATE:  16329 TJD;    37 DOY;   13/02/06
IMG_START_TIME:  73669.48 SOD {20:27:49.48} UT,   3080.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     381875279
X_OFFSET:        782 [pixels]
Y_OFFSET:        767 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       942
Y_GRB_POS:       927
BINNING_INDEX:   1
IM_URL:          sw00547918000msuni3091.fits
SUN_POSTN:       320.66d {+21h 22m 39s}  -15.37d {-15d 21' 58"}
SUN_DIST:        106.42 [deg]   Sun_angle= -12.0 [hr] (East of Sun)
MOON_POSTN:      271.87d {+18h 07m 30s}  -20.12d {-20d 06' 54"}
MOON_DIST:        92.00 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      278.05, -5.83 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      184.09,-65.97 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 06 Feb 13 20:32:45 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     547918,   Seg_Num: 0
POINT_RA:        140.354d {+09h 21m 25s} (J2000)
POINT_DEC:       -58.156d {-58d 09' 22"} (J2000)
ROLL:            180.289d
IMG_START_DATE:  16329 TJD;    37 DOY;   13/02/06
IMG_START_TIME:  73669.48 SOD {20:27:49.48} UT,   3080.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     381875279
X_OFFSET:        782 [pixels]
Y_OFFSET:        767 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       942
Y_GRB_POS:       927
BINNING_INDEX:   1
IM_URL:          sw00547918000msuni3091.fits
SUN_POSTN:       320.66d {+21h 22m 39s}  -15.37d {-15d 21' 58"}
SUN_DIST:        106.42 [deg]   Sun_angle= -12.0 [hr] (East of Sun)
MOON_POSTN:      271.88d {+18h 07m 31s}  -20.12d {-20d 06' 53"}
MOON_DIST:        92.00 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      278.05, -5.83 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      184.09,-65.97 [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:     Wed 06 Feb 13 20:34:10 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     547918,   Seg_Num: 0
GRB_RA:          140.4200d {+09h 21m 40.79s} (J2000),
                 140.5129d {+09h 22m 03.10s} (current),
                 140.0653d {+09h 20m 15.66s} (1950)
GRB_DEC:         -58.1845d {-58d 11' 04.1"} (J2000),
                 -58.2408d {-58d 14' 26.7"} (current),
                 -57.9705d {-57d 58' 13.7"} (1950)
GRB_ERROR:       1.1 [arcsec radius, statistical only]
GRB_MAG:         18.19 +/- 0.40 [mag]
FILTER:          10, White
IMG_START_DATE:  16329 TJD;    37 DOY;   13/02/06
IMG_START_TIME:  73668.00 SOD {20:27:48.00} UT,   3079.4 [sec] since BAT Trigger Time
SUN_POSTN:       320.66d {+21h 22m 39s}  -15.37d {-15d 21' 57"}
SUN_DIST:        106.39 [deg]   Sun_angle= -12.0 [hr] (East of Sun)
MOON_POSTN:      271.89d {+18h 07m 34s}  -20.11d {-20d 06' 49"}
MOON_DIST:        91.97 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      278.09, -5.82 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      184.20,-65.96 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        Result based on srclist data.  
COMMENTS:        Notice generated automatically.

GCN Circular #14183
J.P. Osborne (U. Leicester), D.N. Burrows (PSU), J.A. Kennea (PSU), G. Cusumano (INAF-IASF PA), M. Perri (ASDC) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team:
The XRT began observing the field of GRB 130206A at 20:27:46.2 UT, 3077.7 seconds after the BAT trigger. No source was detected in 1.9 ks of promptly downlinked data. We are waiting for the full dataset to detect and localise the XRT counterpart.
GCN Circular #14184
M. De Pasquale (MSSL-UCL) on behalf of the Swift/UVOT team reports:
UVOT took a finding chart exposure of 150 seconds with the White filter starting 3080 seconds after the BAT trigger. No credible candidates have been identified in the initial data products. The 8'x8' region for the list of sources generated on-board covers about 86% of the BAT error circle. The list of sources is typically complete to about 18 mag.
The GRB occurred in a crowded field only 5.8 deg from the Galactic Plane.
No correction has been made for the expected extinction corresponding to E(B-V) of 0.49.
GCN Circular #14185
A. Klotz (IRAP-CNRS-OMP), D. Macpherson (UWA/ICRAR), D. Coward (UWA), B. Gendre (IRAP-CNRS-OMP), M. Boer, K. Siellez, H. Dereli , O. Bardho (UNS-CNRS-OCA), A. Williams (PO-UWA), R. Martin (PO-UWA) report:
We imaged the field of GRB 130206A detected by SWIFT (trigger 547918) with the Zadko robotic telescope (D=100cm) located at the observatory - Gingin, Australia.
The observations started 106s after the GRB trigger (73s after the notice). The elevation of the field decreased from 48 degrees above horizon and weather conditions were good.
The first image is trailed with a duration of 60.0s (see the description in Klotz et al., 2006, A&A 451, L39). We do not detect any OT in the BAT error box with a limiting magnitude of: t0+106s to t0+166s : R > 16.5
The second image is 30.0s exposure in tracking mode: t0+187s to t0+217s : R > 18.3
We co-added a series of images in tracking mode: t0+187s to t0+482s : R > 20.1
The analysis was made by substraction with images acquired one hour later.
Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.
N.B. Galactic coordinates are lon=278.0587 lat=-5.8228 and the corresponding galactic absorption in R band should be about 1.1 mag (Schlegel et al. 1998).
This message may be cited.
GCN Circular #14186
M. Stamatikos (OSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), M. De Pasquale (UCL-MSSL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
Using the data set from T-61 to T+242 sec from the recent telemetry downlink, we report further analysis of BAT GRB 130206A (trigger #547918) (De Pasquale, et al., GCN Circ. 14181). The BAT ground-calculated position is RA, Dec = 140.387, -58.193 deg which is
```
     RA(J2000)  =  09h 21m 32.9s
     Dec(J2000) = -58d 11' 35.6"
```
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 52%.
The mask-weighted light curve shows two clusters of peaks. The first runs from approximately T-10 sec to T+15 sec and the second from T+20 sec to T+60 sec, though the count rate does not return to baseline between the two clusters. Each of these clusters consists of multiple sub-peaks. There is also some low-level emission extending out to T+150 sec. T90 (15-350 keV) is 128.0 +- 50.6 sec (estimated error including systematics).
The time-averaged spectrum from -12.78 to 147.21 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.56 +- 0.17. The fluence in the 15-150 keV band is 2.0 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+42.72 sec in the 15-150 keV band is 0.3 +- 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/547918/BA/
GCN Circular #14188
Andy Beardomore (Univ. Leicester), A. Breeveld (MSSL-UCL) and M. De Pasquale (MSSL-UCL) on behalf of the Swift team, report:
The Swift-XRT began observing the field of GRB130206A (De Pasquale et al., GCN Circ. 14181) in photon counting mode at 2013-02-06 20:28 UT, 3090 s after the trigger. In 10.3 ks of data we find a faint source at RA, Dec = 140.37670, -58.19362 which is equivalent to
```
RA  (J2000) = 09h 21m 30.41s
Dec (J2000) = -58d 11' 37.0"
```
with an uncertainty of 5.6 arcseconds (radius, 90% confidence). The source is located 20 arcseconds from the BAT refined position (Stamatikos et al, GCN Circ, 14186), within the BAT error circle.
The source is detected at a count rate of 0.0017 =C2=B1 0.0006 count/s. We cannot tell if it is fading at this time.
The Swift/UVOT began settled observations of the field of GRB130206A 3081 s after the BAT trigger. No optical afterglow consistent with the XRT position 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          3081          3231           147         >21.4
white             3081        16409         2114         >23.1
v                 4062        22199         1319         >20.3
b                 3445        15497         1278         >22.3
u                 3239        28222           634         >21.2
w1                4473         27971         1082         >21.0
m2                4268        27065         1312         >20.7
w2                3857         32412         2546         >21.3
```
The magnitudes in the table are not corrected for the strong Galactic extinction due to the reddening of E(B-V) =3D 0.48 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #14189
A. Goldstein (UAH) reports on behalf of the Fermi GBM Team:
At 19:36:30.45 UT on 06 February 2013, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 130206A (trigger 381872193 /130206817) which was also detected by the Swift/BAT (De Pasquale et al. 2013, GCN 14181). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 19 degrees.
The GBM light curve consists of three overlapping pulses with a duration (T90) of about 91 s (50-300 keV). The time-averaged spectrum from T0=-1.5 s to T0+85.6 s is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is -1.1 +/- 0.2 and the cutoff energy, parameterized as Epeak, is 132.6 +/- 34.0 keV.
The event fluence (10-1000 keV) in this time interval is (3.3 +/- 0.4)E-6 erg/cm^2. The 1-sec peak photon flux measured starting from T0+1.8 s in the 10-1000 keV band is 2.1 +/- 0.2 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog.
GCN Circular #14190
J. L. Racusin (NASA/GSFC), G. Vianello (Stanford), N. Omodei (Stanford), and D. Kocevski (NASA/GSFC), report on behalf of the Fermi-LAT team:
The Fermi Large Area Telescope (LAT) observed GRB 130206A, detected by Fermi-GBM (Goldstein et al., GCN 14189) and Swift-BAT (De Pasquale et al., GCN 14181).
The burst location was within the LAT field of view at an angle of ~19.4 degrees to the LAT boresight, and had a zenith angle of 69 degrees. No significant excess is seen using standard analysis procedures. The burst exited the nominal LAT field of view roughly ~600 s after the GBM trigger.
We estimate the 95% confidence upper limits in the energy range of 100 MeV - 10 GeV, assuming spectral index of -2.1, over the time interval 0-40 s:
```
                   F(100MeV-10GeV)  < 3.7e-05 (ph/cm^2/s)
                                    <1.5e-02  (MeV/cm^2/s)
                                    <2.4e-08 (erg/cm^2/s)
```
Using the non-standard LAT Low Energy (LLE) data selection, >60 counts above background were observed in a single FRED like pulse, peaking ~15 s after the GBM trigger. This corresponds to a significance of 2.9 sigma without taking into account trial factors, and therefore does not constitute a clear detection. On the other hand, the putative signal shows good correlation with the low-energy (GBM) light curve. Such faint signal is constituted by low energy gamma-rays, below 75 MeV, and therefore has insufficient spatial resolution to provide a reliable LAT localization. Indeed, no events were observed above 75 MeV using the standard analysis classes.
The Fermi LAT point of contact for this burst is Judith Racusin (judith.racusin@nasa.gov).
The Fermi LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.
GCN Circular #14191
F. Knust (MPE Garching), A. Nicuesa Guelbenzu (TLS Tautenburg) and J. Greiner (MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 130206A (Swift trigger 547918; De Pasquale et al.,GCN 14181) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2m MPG/ESO telescope at La Silla Observatory (Chile).
The first observations started at 01:10 UT on 07 Feb 2013, 6.5 hrs after the GRB trigger, and a second epoch was taken at 7:47 UT on 8 Feb 2013. These observations were performed at an average seeing of 1.4/1.0 arcsec and at an average airmass of 1.3/1.4.
We detect three sources within the 5.6 arcsec Swift-XRT error circle (Beardmore et al., GCN 14188), at positions:
Source 1 RA (2000.0) = 09h 21m 30.45s Decl. (2000.0) = -58d 11' 34.7"
Source 2 RA (2000.0) = 09h 21m 30.10s Decl. (2000.0) = -58d 11' 36.5"
Source 3 RA (2000.0) = 09h 21m 30.14s Decl. (2000.0) = -58d 11' 41.2"
with an uncertainty of 0.5" in each coordinate.
For the aforementioned three sources, the preliminary photometry does not show any variability. Image subtraction between the two epochs has revealed no residuals either.
Based on exposures of 42 min in g'r'i'z' and 54 min in JHK, we do not detect the afterglow within the 5.6" XRT error circle to the following 3-sigma upper limits (AB system):
```
g' > 24.7,
r' > 24.6,
i' > 23.8,
z' > 23.8,
J > 21.6,
H > 21.2 and
K > 20.6
```
The given limits are derived based on calibrating the images against GROND zeropoints and 2MASS field stars and are not corrected for the Galactic foreground extinction corresponding to a reddening of E_(B-V)= 0.5 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #14203
M. De Pasquale (MSSL-UCL), A. Beardmore (Univ. Leicester) report, on behalf of the Swift team:
The X-ray source described in GCN circ. 14188 (Beardmore et al. 2013) is not detected anymore in XRT observations performed between 33 and 550 ks after the trigger, for a total of 35.2 ks of integration time. The 3 sigma upper limit is 0.00089 count/s, appreciably lower than the count rate observed in previous observations. Because of the fading behaviour of this source, we conclude it was likely the X-ray afterglow of GRB130206A.
We also note that successive analysis of late data has reduced the error circle
radius of the source to 4.6'' (90% confidence level).
GCN Report 425.1
GCN_Report 425.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_425_1.pdf by M. De Pasquale at MSSL-UCL titled: "Swift Observations of GRB 130206A"

Back to JG's homepage

Jochen Greiner, last update: 14-Feb-2013 [Disclaimer]