Gamma-ray Burst 090709B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 09 Jul 09 15:08:01 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     356912,   Seg_Num: 0
GRB_RA:           93.593d {+06h 14m 22s} (J2000),
                  93.824d {+06h 15m 18s} (current),
                  92.380d {+06h 09m 31s} (1950)
GRB_DEC:         +64.085d {+64d 05' 07"} (J2000),
                 +64.082d {+64d 04' 55"} (current),
                 +64.100d {+64d 05' 59"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       4189 [cnts]    Image_Peak=120 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   148     E_range: 25-100 keV
BKG_INTEN:       25717 [cnts]
BKG_TIME:        54451.10 SOD {15:07:31.10} UT
BKG_DUR:         8 [sec]
GRB_DATE:        15021 TJD;   190 DOY;   09/07/09
GRB_TIME:        54462.87 SOD {15:07:42.87} UT
GRB_PHI:         -87.57 [deg]
GRB_THETA:        37.03 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     15.74 [sigma]
IMAGE_SIGNIF:    7.47 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  -2 -100  +0 -73  +0 
SUN_POSTN:       109.00d {+07h 16m 00s}  +22.29d {+22d 17' 18"}
SUN_DIST:         42.99 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      314.02d {+20h 56m 05s}  -16.19d {-16d 11' 10"}
MOON_DIST:       124.85 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      150.32, 20.33 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       92.07, 40.67 [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 = 13.02,17.82 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(1.0<100sec) coincident with the FERMI_GBM event (trignum=268844863).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 09 Jul 09 15:08:02 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     268844863
GRB_RA:           76.617d {+05h 06m 28s} (J2000),
                  76.846d {+05h 07m 23s} (current),
                  75.416d {+05h 01m 40s} (1950)
GRB_DEC:         +64.267d {+64d 15' 60"} (J2000),
                 +64.279d {+64d 16' 44"} (current),
                 +64.199d {+64d 11' 58"} (1950)
GRB_ERROR:       19.35 [deg radius, statistical plus systematic]
GRB_INTEN:       114 [cnts/sec]
DATA_SIGNIF:     7.00 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        15021 TJD;   190 DOY;   09/07/09
GRB_TIME:        54461.14 SOD {15:07:41.14} UT
GRB_PHI:          23.00 [deg]
GRB_THETA:        40.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.34
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      91%  GRB
2nd_MOST_LIKELY:   4%  GRO_J0422_32
DETECTORS:       1,1,0, 0,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       109.00d {+07h 16m 00s}  +22.29d {+22d 17' 18"}
SUN_DIST:         47.03 [deg]   Sun_angle= 2.1 [hr] (West of Sun)
MOON_POSTN:      314.02d {+20h 56m 05s}  -16.19d {-16d 11' 10"}
MOON_DIST:       118.50 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      146.58, 13.88 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       82.33, 41.18 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 187.35,14.68 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 09 Jul 09 15:08:40 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     268844863
GRB_RA:           57.990d {+03h 51m 58s} (J2000),
                  58.209d {+03h 52m 50s} (current),
                  56.845d {+03h 47m 23s} (1950)
GRB_DEC:         +65.130d {+65d 07' 48"} (J2000),
                 +65.158d {+65d 09' 29"} (current),
                 +64.980d {+64d 58' 48"} (1950)
GRB_ERROR:       4.62 [deg radius, statistical only]
DATA_SIGNIF:     15.00 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        15021 TJD;   190 DOY;   09/07/09
GRB_TIME:        54461.14 SOD {15:07:41.14} UT
GRB_PHI:          23.00 [deg]
GRB_THETA:        32.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:       109.00d {+07h 16m 00s}  +22.29d {+22d 17' 18"}
SUN_DIST:         53.85 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      314.02d {+20h 56m 06s}  -16.18d {-16d 11' 03"}
MOON_DIST:       110.60 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      140.48,  8.61 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       72.05, 43.67 [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/FERMI NOTICE
NOTICE_DATE:     Thu 09 Jul 09 15:08:07 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      57
TRIGGER_NUM:     268844863
GRB_RA:           65.383d {+04h 21m 32s} (J2000),
                  65.618d {+04h 22m 28s} (current),
                  64.158d {+04h 16m 38s} (1950)
GRB_DEC:         +66.750d {+66d 45' 00"} (J2000),
                 +66.772d {+66d 46' 19"} (current),
                 +66.631d {+66d 37' 53"} (1950)
GRB_ERROR:       9.85 [deg radius, statistical plus systematic]
GRB_INTEN:       145 [cnts/sec]
DATA_SIGNIF:     14.50 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        15021 TJD;   190 DOY;   09/07/09
GRB_TIME:        54461.14 SOD {15:07:41.14} UT
GRB_PHI:          26.00 [deg]
GRB_THETA:        35.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      1.02
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   2%  Solar Flare
DETECTORS:       1,1,0, 0,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       109.00d {+07h 16m 00s}  +22.29d {+22d 17' 18"}
SUN_DIST:         52.14 [deg]   Sun_angle= 2.9 [hr] (West of Sun)
MOON_POSTN:      314.02d {+20h 56m 05s}  -16.19d {-16d 11' 09"}
MOON_DIST:       113.30 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      141.60, 11.84 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       76.68, 44.45 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 187.35,14.68 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 09 Jul 09 15:12:57 UT            
NOTICE_TYPE:     Swift-BAT GRB Lightcurve             
TRIGGER_NUM:     1769985,   Seg_Num: 67
GRB_RA:           93.593d {+06h 14m 22s} (J2000),
                  93.824d {+06h 15m 18s} (current),
                  92.380d {+06h 09m 31s} (1950)
GRB_DEC:         +64.085d {+64d 05' 07"} (J2000),
                 +64.082d {+64d 04' 55"} (current),
                 +64.100d {+64d 05' 59"} (1950)
GRB_DATE:        15021 TJD;   190 DOY;   09/07/09
GRB_TIME:        54462.87 SOD {15:07:42.87} UT
TRIGGER_INDEX:   148
GRB_PHI:         -87.57 [deg]
GRB_THETA:        37.03 [deg]
DELTA_TIME:      -31059.00 [sec]
TRIGGER_DUR:     1.024 [sec]
SOLN_STATUS:     0x3
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    0.00 [sigma]
LC_URL:          sw00356912000msb.lc
SUN_POSTN:       109.00d {+07h 16m 01s}  +22.29d {+22d 17' 17"}
SUN_DIST:         42.99 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      314.06d {+20h 56m 14s}  -16.17d {-16d 10' 17"}
MOON_DIST:       124.82 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      150.32, 20.33 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       92.07, 40.67 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.
COMMENTS:
COMMENTS:        WARNING: No BAT_Position TDRSS message was received for this
trigger_number!
COMMENTS:
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 = 13.02,17.82 [deg].
COMMENTS:        The 3rd packet (of 3) was missing in the lightcurve data stream.

GCN Circular #9633
F. E. Marshall (NASA/GSFC), S. D. Barthelmy (GSFC), D. N. Burrows (PSU), V. D'Elia (ASDC), P. A. Evans (U Leicester), O. Godet (U Leicester), C. Guidorzi (U Ferrara), S. T. Holland (CRESST/USRA/GSFC), E. A. Hoversten (PSU), H. A. Krimm (CRESST/GSFC/USRA), K. L. Page (U Leicester), D. M. Palmer (LANL), A. Rowlinson (U Leicester), B. Sbarufatti (INAF-IASFPA), M. H. Siegel (PSU), M. A. Stark (PSU), R. L. C. Starling (U Leicester) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team:
At 15:07:42 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 090709B (trigger=356912). Swift did not slew because of Sun constraint. The BAT on-board calculated location is RA, Dec 93.593, +64.085, which is
```
   RA(J2000)  =  06h 14m 22s
   Dec(J2000) = +64d 05' 07"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single peak with a duration of at least 10 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~0 sec after the trigger.
Due to a Sun constraint, Swift cannot slew to the BAT position until 18th July 2009. There will thus be no immediate XRT or UVOT data for this trigger.
Burst Advocate for this burst is F. E. Marshall (marshall AT milkyway.gsfc.nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular #9641
T. N. Ukwatta (GWU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), A. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), (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 090709B (trigger #356912) (Marshall et al., GCN Circ. 9633). The BAT ground-calculated position is RA, Dec = 93.522, 64.081 deg which is
```
   RA(J2000)  =  06h 14m 05.4s
   Dec(J2000) = +64d 04' 51.9"
```
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 15%.
The mask-weighted light curve shows a main peak beginning at T-5 seconds and continuing until T+10 sec. There are then two much weaker peaks at approximately T+25 and T+35 sec. At T+240 sec, a pre-planned spacecraft slew took the source out of the BAT FOV. T90 (15-350 keV) is 27.2 +- 6.6 sec (estimated error including systematics).
The time-averaged spectrum from T-5.4 to T+35.9 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.51 +- 0.18. The fluence in the 15-150 keV band is 1.5 +- 0.2 x 10-6 erg/cm2. The 1-sec peak photon flux measured from T+1.47 sec in the 15-150 keV band is 2.1 +- 0.4 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/356912/BA/
GCN Circular #9650
C. Meegan (USRA) and A. J. van der Horst (NASA/MSFC/ORAU) report on behalf of the Fermi GBM Team:
"At 15:07:41.14 UT on 09 July 2009, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 090709B (trigger 268844863 / 090709630), which was also detected by the SWIFT-BAT (GCN 9633). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 35 degrees.
The GBM light curve consists of two pulses with a duration (T90) of about 32 s (8-1000 keV). The time-averaged spectrum from T0-2.0 s to T0+27.6 s is best fit by a power law function with an exponential high energy cutoff. The power law index is -1.01 +/- 0.16 and the cutoff energy, parameterized as Epeak, is 130 +/- 24 keV (chi squared 354 for 365 d.o.f.).
The event fluence (8-1000 keV) in this time interval is (1.3 +/- 0.2)E-6 erg/cm^2. The 1-sec peak photon flux measured starting from T0+2.0 s in the 8-1000 keV band is 2.0 +/- 0.3 ph/s/cm^2.
The temporal and spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Report 231.1
GCN_Report 231.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_231_1.pdf by F.E. Marshall at NASA/GSFC titled: "Final Results on Swift GRB 090709B"

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Jochen Greiner, last update: 22-Jul-2009 [Disclaimer]