Gamma-ray Burst 110207A

(All information courtesy of the instrument teams.)

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 07 Feb 11 11:17:34 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     444912,   Seg_Num: 0
GRB_RA:           12.542d {+00h 50m 10s} (J2000),
                  12.682d {+00h 50m 44s} (current),
                  11.913d {+00h 47m 39s} (1950)
GRB_DEC:         -10.806d {-10d 48' 20"} (J2000),
                 -10.745d {-10d 44' 42"} (current),
                 -11.078d {-11d 04' 39"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       557 [cnts]    Image_Peak=62 [image_cnts]
TRIGGER_DUR:     0.064 [sec] 
TRIGGER_INDEX:   10418     E_range: 25-100 keV
BKG_INTEN:       35752 [cnts]
BKG_TIME:        40625.35 SOD {11:17:05.35} UT
BKG_DUR:         8 [sec]
GRB_DATE:        15599 TJD;    38 DOY;   11/02/07
GRB_TIME:        40639.75 SOD {11:17:19.75} UT
GRB_PHI:         -35.00 [deg]
GRB_THETA:        14.37 [deg]
SOLN_STATUS:     0x2003
RATE_SIGNIF:     15.58 [sigma]
IMAGE_SIGNIF:    7.39 [sigma]
MERIT_PARAMS:     +1  +0  +0  -4  +2  -3  -5  +0 -63  +0 
SUN_POSTN:       320.76d {+21h 23m 02s}  -15.34d {-15d 20' 07"}
SUN_DIST:         50.68 [deg]   Sun_angle= -3.5 [hr] (East of Sun)
MOON_POSTN:        3.65d {+00h 14m 35s}   +7.15d {+07d 08' 57"}
MOON_DIST:        20.03 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      121.82,-73.67 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        7.20,-14.88 [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:        There is a bright star (mag=5.19) 9.70 arcmin from this position.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 48.37,-13.78 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 07 Feb 11 11:17:38 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      49
TRIGGER_NUM:     318770242
GRB_RA:           14.267d {+00h 57m 04s} (J2000),
                  14.406d {+00h 57m 37s} (current),
                  13.641d {+00h 54m 34s} (1950)
GRB_DEC:         -12.283d {-12d 16' 59"} (J2000),
                 -12.223d {-12d 13' 23"} (current),
                 -12.553d {-12d 33' 12"} (1950)
GRB_ERROR:       13.40 [deg radius, statistical plus systematic]
GRB_INTEN:       251 [cnts/sec]
DATA_SIGNIF:     8.70 [sigma]
INTEG_TIME:      0.512 [sec]
GRB_DATE:        15599 TJD;    38 DOY;   11/02/07
GRB_TIME:        40640.29 SOD {11:17:20.29} UT
GRB_PHI:         312.00 [deg]
GRB_THETA:        70.00 [deg]
DATA_TIME_SCALE: 0.5120 [sec]
HARD_RATIO:      0.66
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      94%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,0,0, 1,1,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       320.76d {+21h 23m 03s}  -15.34d {-15d 20' 06"}
SUN_DIST:         52.07 [deg]   Sun_angle= -3.6 [hr] (East of Sun)
MOON_POSTN:        3.65d {+00h 14m 35s}   +7.15d {+07d 08' 58"}
MOON_DIST:        22.13 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      128.29,-75.10 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        8.19,-16.92 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 170.30,-16.53 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 07 Feb 11 11:17:54 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     318770242
GRB_RA:           12.150d {+00h 48m 36s} (J2000),
                  12.291d {+00h 49m 10s} (current),
                  11.514d {+00h 46m 03s} (1950)
GRB_DEC:          -4.430d {-04d 25' 47"} (J2000),
                  -4.370d {-04d 22' 10"} (current),
                  -4.702d {-04d 42' 08"} (1950)
GRB_ERROR:       8.33 [deg radius, statistical only]
DATA_SIGNIF:     9.20 [sigma]  
DATA_INTERVAL:   0.064 [sec]
GRB_DATE:        15599 TJD;    38 DOY;   11/02/07
GRB_TIME:        40640.29 SOD {11:17:20.29} UT
GRB_PHI:         310.00 [deg]  
GRB_THETA:        78.00 [deg]  
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:       320.76d {+21h 23m 03s}  -15.34d {-15d 20' 06"}
SUN_DIST:         51.80 [deg]   Sun_angle= -3.4 [hr] (East of Sun)
MOON_POSTN:        3.65d {+00h 14m 36s}   +7.15d {+07d 09' 01"} 
MOON_DIST:        14.39 [deg]  
MOON_ILLUM:      16 [%]        
GAL_COORDS:      121.10,-67.29 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        9.43, -8.88 [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:     Mon 07 Feb 11 11:21:02 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     444912,   Seg_Num: 0
GRB_RA:           12.542d {+00h 50m 10s} (J2000),
                  12.682d {+00h 50m 44s} (current),
                  11.913d {+00h 47m 39s} (1950)
GRB_DEC:         -10.806d {-10d 48' 20"} (J2000),
                 -10.745d {-10d 44' 42"} (current),
                 -11.078d {-11d 04' 39"} (1950)
GRB_DATE:        15599 TJD;    38 DOY;   11/02/07
GRB_TIME:        40640.01 SOD {11:17:20.01} UT
TRIGGER_INDEX:   10418
GRB_PHI:         -35.00 [deg]
GRB_THETA:        14.37 [deg]
DELTA_TIME:      -24.00 [sec]
TRIGGER_DUR:     0.064 [sec] 
SOLN_STATUS:     0x2003
RATE_SIGNIF:     15.58 [sigma]
IMAGE_SIGNIF:    7.39 [sigma]
LC_URL:          sw00444912000msb.lc
SUN_POSTN:       320.76d {+21h 23m 03s}  -15.33d {-15d 20' 04"}
SUN_DIST:         50.68 [deg]   Sun_angle= -3.5 [hr] (East of Sun)
MOON_POSTN:        3.67d {+00h 14m 42s}   +7.16d {+07d 09' 37"}
MOON_DIST:        20.03 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      121.82,-73.67 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        7.20,-14.88 [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:        There is a bright star (mag=5.19) 9.70 arcmin from this position.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 48.37,-13.78 [deg].

GCN Circular #11658
O. M. Littlejohns (U Leicester), A. P. Beardmore (U Leicester), S. Campana (INAF-OAB), V. D'Elia (ASDC), P. A. Evans (U Leicester), J. M. Gelbord (PSU), S. T. Holland (CRESST/USRA/GSFC), N. P. M. Kuin (UCL-MSSL), P. T. O'Brien (U Leicester), C. Pagani (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), P. Romano (INAF-IASFPA), A. Rowlinson (U Leicester), T. Sakamoto (NASA/UMBC), B. Sbarufatti (INAF-OAB/IASFPA), M. H. Siegel (PSU) and R. L. C. Starling (U Leicester) report on behalf of the Swift Team:
At 11:17:20 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 110207A (trigger=444912). Swift could not slew to the burst due to a Moon constraint. The BAT on-board calculated location is RA, Dec 12.542, -10.806 which is
```
   RA(J2000) = 00h 50m 10s
   Dec(J2000) = -10d 48' 20"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex multi-peaked structure with a duration of about 40 sec. The peak count rate was ~8000 counts/sec (15-350 keV), at ~0.5 sec after the trigger.
Due to a Moon observing constraint, Swift cannot slew to the BAT position until 13:20 UT on 2011 February 08. There will thus be no XRT or UVOT data for this trigger before this time.
Burst Advocate for this burst is O. M. Littlejohns (oml2 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 #11660
V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina Blagoveschensk Educational State University, Blagoveschensk
K.Ivanov, O.Chuvalaev, V.Poleschuk, E.Konstantinov, V.Lenok, O.Gres, S.Yazev, N.M.Budnev, Irkutsk State University
E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zimnukhov, M. Kornilov, V.Shumkov, S.Shurpakov Sternberg Astronomical Institute, Moscow State University
V.Krushinski, I.Zalozhnich, A. Popov Ural State University, Kourovka
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
Two MASTER II robotic telescopes (MASTER-Net: http://observ.pereplet.ru) located in Amur-Blagoveschensk and Tunka-Baykal was pointed to the GRB110207A 65 and 30 sec after GRB time correspondingly. On our first (10s exposure) set we haven`t found optical transient within SWIFT-BAT error-box (Littlejohns et al., GCN Curc 11658). Because GRB duration is 40 sec, the first images from Tunka is prompt. The obdervations was done at high zenith distance (>80 degrees).
The 3-sigma upper limit has been about:
```
-----------------------------------------------------------------------
Start Time     mean time       Exp     Limit   Filter    Site 
after trigger  after trigger   (s)
-----------------------------------------------------------------------
    30s           35s           10      13.0     V+P\/   Tunka-Baykal
    65s           70s           10      14.1     V+P-|  Amur-Blagoveschensk
    65s          747s         1370      17.0     V+P-|  Amur-Blagoveschensk
   1700s        1790s          180      17.4      R       Tunka-Baykal
------------------------------------------------------------------------
```
P - is polarization.
The message may be cited.
mailto: lipunov@sai.msu.ru
GCN Circular #11664
D. M. Palmer (LANL), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), O. M. Littlejohns (U Leicester), C. B. Markwardt (GSFC), 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-240 to T+962 sec from recent telemetry downlinks, we report further analysis of BAT GRB 110207A (trigger #444912) (Littlejohns, et al., GCN Circ. 11658). The BAT ground-calculated position is RA, Dec = 12.540, -10.790 deg, which is
```
   RA(J2000)  =  00h 50m 09.5s 
   Dec(J2000) = -10d 47' 23.8" 
```
with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted light curve shows at least seven short peaks starting at ~T-0.1 sec and ending at ~T+20 sec with a long decay extending out to ~T+110 sec. T90 (15-350 keV) is 80.3 +- 16.2 sec (estimated error including systematics).
The time-averaged spectrum from T-0.1 to T+108.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.30 +- 0.12. The fluence in the 15-150 keV band is 1.6 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-0.11 sec in the 15-150 keV band is 1.1 +- 0.1 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/444912/BA/
GCN Circular #11667
Klotz A. (CESR-OMP), Gendre B. (ASDC), Laas-Bourez M. (UWA) Boer M. (OHP-OAMP), Atteia J.L. (LATT-OMP) report:
We imaged the field of GRB 110207A detected by SWIFT (trigger 444912) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France.
The observations started 6.62h after the GRB trigger (beginning of the night). The elevation of the field decreased from 25 degrees above horizon and weather conditions were good.
We co-added a series of exposures. No OT was detected : t0+6.62h to t0+7.79h : R > 19.8
Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.
N.B. Galactic coordinates are lon=121.8238 lat=-73.6747 and the galactic extinction in R band is 0.1 magnitude estimated from D. Schlegel et al. 1998ApJ...500..525S.
This message may be cited.
GCN Circular #11671
A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team:
"At 11:17:20.29 UT on 07 February 2011, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 110207A (trigger 318770242/ 110207470), which was also detected by the Swift/BAT (Littlejohns et al. 2011, GCN 11658) The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 72.8 degrees.
The GBM light curve shows a multi-peaked structure with a duration (T90) of about 39 s (50-300 keV). The time-averaged spectrum from T0-0.256 s to T0+38.912 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.09 (+0.13/-0.12) and the cutoff energy, parameterized as Epeak, is 450 (+290/-130) keV. The event fluence (10-1000 keV) in this time interval is (4.4 +/- 0.6)E-06 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+0.211 s in the 10-1000 keV band is 2.3 +/- 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 #11680
P.A. Evans and O.M. Littlejohns (U. Leicester) report on behalf of the Swift team:
Swift observed the field of GRB 110207A (Littlejohns et al., GCN Circ. 11658) for 5 ks from T0+99 ks to T0+112 ks; earlier observations were impossible due to the proximity of the GRB to the Moon. We find no X-ray sources in the BAT field of view, placing a 3-sigma upper limit on the afterglow brightness of 7.6e-14 erg/cm^2/sec during this interval (0.3-10 keV; assuming a typical GRB spectrum). Due to the proximity of the GRB to the Sun, no further observations are planned.
This circular is an official product of the Swift-XRT team.
GCN Circular #11695
P. Tsai, Y. Urata (NCU), T. Uehara, Y. Hanabata, T. Takahashi, Y. Fukazawa (Hiroshima U.), N. Vasquez (Tokyo Tech.), K. Yamaoka (Aoyama Gakuin U.), S. Sugita (Nagoya U.), Y. Terada, M. Tashiro, S. Hong, W. Iwakiri, K. Takahara, T. Yasuda (Saitama U.), M. Ohno, M. Kokubun, T. Takahashi (ISAS/JAXA), Y. E. Nakagawa, T. Tamagawa, M. Serino (RIKEN), N. Ohmori, A. Daikyuji, Y. Nishioka, M. Yamauchi (Univ. of Miyazaki), K. Nakazawa, K. Makishima (Univ. of Tokyo), on behalf of the Suzaku WAM team, report:
The GRB 110207A (Swift/BAT trigger #444912 ; Littlejohns et al., GCN 11658; Palmer et al., GCN 11664) triggered the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 2011/02/07 11:17:20.05 UT (=T0).
The observed light curve shows a multi-peaked structure lasting from T0-0.2s to T0+3.2s with a duration (T90) of about 2.9 seconds. The fluence in 100 - 1000 keV was 5.98 (+/-0.54) x 10^-7 erg/cm^2. The 1-s peak flux measured from T0+0.32s was 0.27 (+/-0.06) photons/cm^2/s in the same energy range.
Preliminary result shows that the time-averaged spectrum from T0-0.2s to T0+3.2s is well fitted by a single power-law with a photon index of 1.53 (-0.24, +0.29) (chi^2/d.o.f = 34.22/34).
All the quoted errors are at statistical 90% confidence level, in which the systematic uncertainties are not included.
The light curves for this burst are available at: http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html
GCN Report 321.1
GCN_Report 321.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_321_1.pdf by O.M. Littlejohns at U. Leicester titled: "Final Swift Observations of GRB 110207A"

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Jochen Greiner, last update: 11-Feb-2011 [Disclaimer]