Gamma-ray Burst 090712

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sun 12 Jul 09 03:51:46 UT
  NOTICE_TYPE:     Swift-BAT GRB Position
  TRIGGER_NUM:     357072,   Seg_Num: 0
  GRB_RA:           70.103d {+04h 40m 25s} (J2000),
                    70.246d {+04h 40m 59s} (current),
                    69.354d {+04h 37m 25s} (1950)
  GRB_DEC:         +22.557d {+22d 33' 26"} (J2000),
                   +22.575d {+22d 34' 30"} (current),
                   +22.461d {+22d 27' 38"} (1950)
  GRB_ERROR:       3.00 [arcmin radius, statistical only]
  GRB_INTEN:       19352 [cnts]    Image_Peak=370 [image_cnts]
  TRIGGER_DUR:     4.096 [sec] 
  TRIGGER_INDEX:   298     E_range: 25-100 keV
  BKG_INTEN:       168715 [cnts]
  BKG_TIME:        13811.09 SOD {03:50:11.09} UT
  BKG_DUR:         40 [sec]
  GRB_DATE:        15024 TJD;   193 DOY;   09/07/12
  GRB_TIME:        13865.17 SOD {03:51:05.17} UT
  GRB_PHI:         -22.08 [deg]
  GRB_THETA:        35.16 [deg]
  SOLN_STATUS:     0x20000003
  RATE_SIGNIF:     10.67 [sigma]
  IMAGE_SIGNIF:    7.56 [sigma]
  MERIT_PARAMS:     +1  +0  +0  +2  +2  -2 -100  +0 -78  +0 
  SUN_POSTN:       111.58d {+07h 26m 19s}  +21.96d {+21d 57' 20"}
  SUN_DIST:         38.13 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
  MOON_POSTN:      342.11d {+22h 48m 25s}   -3.71d {-03d 42' 44"}
  MOON_DIST:        89.71 [deg]
  MOON_ILLUM:      81 [%]
  GAL_COORDS:      176.69,-15.65 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:       71.68,  0.37 [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 = 107.31,18.95 [deg].  
  COMMENTS:           
  COMMENTS:        NOTE: This BAT event is temporally(5.0<100sec) coincident with the FERMI_GBM event (trignum=269063462).  
  

• red DSS finding chart ps-file
  
  
• GCN NOTICE
  

  TITLE:           GCN/FERMI NOTICE
  NOTICE_DATE:     Sun 12 Jul 09 03:51:07 UT
  NOTICE_TYPE:     Fermi-GBM Flight Position
  RECORD_NUM:      45
  TRIGGER_NUM:     269063462
  GRB_RA:           79.900d {+05h 19m 36s} (J2000),
                    80.035d {+05h 20m 08s} (current),
                    79.191d {+05h 16m 46s} (1950)
  GRB_DEC:         +14.133d {+14d 07' 60"} (J2000),
                   +14.143d {+14d 08' 33"} (current),
                   +14.083d {+14d 04' 58"} (1950)
  GRB_ERROR:       34.77 [deg radius, statistical plus systematic]
  GRB_INTEN:       42 [cnts/sec]
  DATA_SIGNIF:     4.50 [sigma]
  INTEG_TIME:      4.096 [sec]
  GRB_DATE:        15024 TJD;   193 DOY;   09/07/12
  GRB_TIME:        13860.34 SOD {03:51:00.34} UT
  GRB_PHI:         338.00 [deg]
  GRB_THETA:        45.00 [deg]
  DATA_TIME_SCALE: 4.0960 [sec]
  HARD_RATIO:      1.22
  LOC_ALGORITHM:   3 (version number of)
  MOST_LIKELY:      88%  GRB
  2nd_MOST_LIKELY:   9%  Solar Flare
  DETECTORS:       0,1,0, 1,0,0, 0,0,0, 0,0,0, 0,0,
  SUN_POSTN:       111.58d {+07h 26m 19s}  +21.96d {+21d 57' 20"}
  SUN_DIST:         30.93 [deg]   Sun_angle= 2.1 [hr] (West of Sun)
  MOON_POSTN:      342.10d {+22h 48m 24s}   -3.71d {-03d 42' 52"}
  MOON_DIST:        98.59 [deg]
  MOON_ILLUM:      81 [%]
  GAL_COORDS:      189.35,-13.02 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:       80.09, -8.96 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
  COMMENTS:        This trigger occurred at longitude,latitude = 28.72,-8.62 [deg].  
  

• GCN NOTICE
  

  TITLE:           GCN/FERMI NOTICE
  NOTICE_DATE:     Sun 12 Jul 09 03:51:40 UT
  NOTICE_TYPE:     Fermi-GBM Ground Position
  RECORD_NUM:      57
  TRIGGER_NUM:     269063462
  GRB_RA:           81.510d {+05h 26m 02s} (J2000),
                    81.652d {+05h 26m 37s} (current),
                    80.764d {+05h 23m 03s} (1950)
  GRB_DEC:         +21.050d {+21d 03' 00"} (J2000),
                   +21.058d {+21d 03' 28"} (current),
                   +21.007d {+21d 00' 26"} (1950)
  GRB_ERROR:       20.13 [deg radius, statistical only]
  DATA_SIGNIF:     5.00 [sigma]
  DATA_INTERVAL:   4.096 [sec]
  GRB_DATE:        15024 TJD;   193 DOY;   09/07/12
  GRB_TIME:        13860.34 SOD {03:51:00.34} UT
  GRB_PHI:         348.00 [deg]
  GRB_THETA:        44.00 [deg]
  E_RANGE:         44.032 - 279.965 [keV]
  LOC_ALGORITHM:   413 (Gnd S/W Version number)
  SUN_POSTN:       111.58d {+07h 26m 19s}  +21.96d {+21d 57' 20"}
  SUN_DIST:         27.82 [deg]   Sun_angle= 2.0 [hr] (West of Sun)
  MOON_POSTN:      342.10d {+22h 48m 25s}   -3.71d {-03d 42' 45"}
  MOON_DIST:       100.24 [deg]
  MOON_ILLUM:      81 [%]
  GAL_COORDS:      184.30, -7.97 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:       82.07, -2.16 [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:     Sun 12 Jul 09 03:54:34 UT
  NOTICE_TYPE:     Swift-BAT GRB Lightcurve
  TRIGGER_NUM:     357072,   Seg_Num: 0
  GRB_RA:           70.103d {+04h 40m 25s} (J2000),
                    70.246d {+04h 40m 59s} (current),
                    69.354d {+04h 37m 25s} (1950)
  GRB_DEC:         +22.557d {+22d 33' 26"} (J2000),
                   +22.575d {+22d 34' 30"} (current),
                   +22.461d {+22d 27' 38"} (1950)
  GRB_DATE:        15024 TJD;   193 DOY;   09/07/12
  GRB_TIME:        13865.17 SOD {03:51:05.17} UT
  TRIGGER_INDEX:   298
  GRB_PHI:         -22.08 [deg]
  GRB_THETA:        35.16 [deg]
  DELTA_TIME:      32.00 [sec]
  TRIGGER_DUR:     4.096 [sec] 
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     10.67 [sigma]
  IMAGE_SIGNIF:    7.56 [sigma]
  LC_URL:          sw00357072000msb.lc
  SUN_POSTN:       111.58d {+07h 26m 20s}  +21.96d {+21d 57' 19"}
  SUN_DIST:         38.14 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
  MOON_POSTN:      342.13d {+22h 48m 30s}   -3.70d {-03d 42' 06"}
  MOON_DIST:        89.69 [deg]
  MOON_ILLUM:      81 [%]
  GAL_COORDS:      176.69,-15.65 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:       71.68,  0.37 [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 = 107.31,18.95 [deg].  
  

  
• GCN Circular #9659
  S. T. Holland (CRESST/USRA/GSFC), N. Gehrels (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), A. Rowlinson (U Leicester), M. H. Siegel (PSU) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team:
  At 03:51:05 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 090712 (trigger=357072). Swift could not slew due to the Sun constraint. The BAT on-board calculated location is RA, Dec 70.103, +22.557 which is

     RA(J2000) = 04h 40m 25s
     Dec(J2000) = +22d 33' 26"
  

  with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single broad triangular peak structure with a duration of about 100 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~0 sec after the trigger.
  Because of the constraint, the BAT position is unobservable by Swift until 21st July 2009. There will thus be no prompt XRT or UVOT data for this trigger.
  Burst Advocate for this burst is S. T. Holland (sholland 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 #9660
  S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), S. T. Holland (CRESST/USRA/GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), A. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
  Using the data set from T-239 to T+355 sec from recent telemetry downlinks, we report further analysis of BAT GRB 090712 (trigger #357072) (Holland, et al., GCN Circ. 9659). The BAT ground-calculated position is RA, Dec = 70.097, 22.525 deg, which is

     RA(J2000)  =  04h 40m 23.2s 
     Dec(J2000) = +22d 31' 29.4" 
  

  with an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 67%.
  The mask-weighted light curve shows a mostly smooth peak starting at ~T-160 sec, peaking at ~T_zero, and ending at ~T+170 sec. T90 (15-350 keV) is 145 +- 52 sec (estimated error including systematics).
  The time-averaged spectrum from T-99.1 to T+157.8 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.33 +- 0.11. The fluence in the 15-150 keV band is 4.0 +- 0.3 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-6.10 sec in the 15-150 keV band is 0.9 +- 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/357072/BA/
• GCN Circular #9662
  A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team:
  "At 03:51:00.34 UT on 12 July 2009, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 090712 (trigger 269063462 / 090712160), which was also detected by the SWIFT-BAT (Holland et al. 2008, GCN 9659, Barthelmy et al., GCN 9660). The GBM on-ground location is consistent with the Swift position.
  The angle from the Fermi LAT boresight is 33 degrees.
  The GBM light curve shows one single pulse with a duration (T90) of about 72 s (8-1000 keV). The time-averaged spectrum from T0-22.528 s to T0+49.153 s is best fit by a power law function with an exponential high energy cutoff. The power law index is -0.68 +/- 0.13 and the cutoff energy, parameterized as Epeak, is 505 +/- 101 keV (chi squared 511 for 486 d.o.f.).
  The event fluence (8-1000 keV) in this time interval is (4.2 +/- 0.3)E-06 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+7.168 s in the 8-1000 keV band is 0.63 +/- 0.04 ph/s/cm^2.
  The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
• GCN Report 230.1
  GCN_Report 230.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_230_1.pdf by S.T. Holland at CRESST/USRA/GSFC titled: "Final Results on Swift GRB 090712"