Gamma-ray Burst 091112

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN NOTICE
  

  TITLE:           GCN/FERMI NOTICE
  NOTICE_DATE:     Thu 12 Nov 09 17:41:30 UT
  NOTICE_TYPE:     Fermi-GBM Flight Position
  RECORD_NUM:      45
  TRIGGER_NUM:     279740477
  GRB_RA:          249.650d {+16h 38m 36s} (J2000),
                   249.824d {+16h 39m 18s} (current),
                   248.772d {+16h 35m 05s} (1950)
  GRB_DEC:         -42.450d {-42d 27' 00"} (J2000),
                   -42.469d {-42d 28' 07"} (current),
                   -42.351d {-42d 21' 03"} (1950)
  GRB_ERROR:       21.07 [deg radius, statistical plus systematic]
  GRB_INTEN:       113 [cnts/sec]
  DATA_SIGNIF:     6.00 [sigma]
  INTEG_TIME:      1.024 [sec]
  GRB_DATE:        15147 TJD;   316 DOY;   09/11/12
  GRB_TIME:        63675.82 SOD {17:41:15.82} UT
  GRB_PHI:         329.00 [deg]
  GRB_THETA:        75.00 [deg]
  DATA_TIME_SCALE: 1.0240 [sec]
  HARD_RATIO:      0.59
  LOC_ALGORITHM:   3 (version number of)
  MOST_LIKELY:      91%  GRB
  2nd_MOST_LIKELY:   4%  Distant Particles
  DETECTORS:       0,0,0, 0,1,1, 0,0,0, 0,0,0, 0,0,
  SUN_POSTN:       228.03d {+15h 12m 07s}  -17.87d {-17d 51' 55"}
  SUN_DIST:         30.79 [deg]   Sun_angle= -1.5 [hr] (East of Sun)
  MOON_POSTN:      178.29d {+11h 53m 10s}   -4.39d {-04d 23' 30"}
  MOON_DIST:        73.46 [deg]
  MOON_ILLUM:      18 [%]
  GAL_COORDS:      341.12,  2.98 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      254.14,-20.12 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        Fermi-GBM Flight-calculated Coordinates.
  COMMENTS:        This trigger occurred at longitude,latitude = 202.18,25.55 [deg].
  

• GCN NOTICE
  

  TITLE:           GCN/FERMI NOTICE
  NOTICE_DATE:     Thu 12 Nov 09 17:41:45 UT
  NOTICE_TYPE:     Fermi-GBM Flight Position
  RECORD_NUM:      57
  TRIGGER_NUM:     279740477
  GRB_RA:          252.717d {+16h 50m 52s} (J2000),
                   252.901d {+16h 51m 36s} (current),
                   251.784d {+16h 47m 08s} (1950)
  GRB_DEC:         -47.800d {-47d 47' 59"} (J2000),
                   -47.816d {-47d 48' 57"} (current),
                   -47.715d {-47d 42' 53"} (1950)
  GRB_ERROR:       9.98 [deg radius, statistical plus systematic]
  GRB_INTEN:       176 [cnts/sec]
  DATA_SIGNIF:     16.80 [sigma]
  INTEG_TIME:      4.096 [sec]
  GRB_DATE:        15147 TJD;   316 DOY;   09/11/12
  GRB_TIME:        63675.82 SOD {17:41:15.82} UT
  GRB_PHI:         323.00 [deg]
  GRB_THETA:        75.00 [deg]
  DATA_TIME_SCALE: 4.0960 [sec]
  HARD_RATIO:      0.75
  LOC_ALGORITHM:   3 (version number of)
  MOST_LIKELY:      91%  GRB
  2nd_MOST_LIKELY:   5%  Distant Particles
  DETECTORS:       0,0,0, 0,1,1, 0,0,0, 0,0,0, 0,0,
  SUN_POSTN:       228.03d {+15h 12m 07s}  -17.87d {-17d 51' 56"}
  SUN_DIST:         36.18 [deg]   Sun_angle= -1.7 [hr] (East of Sun)
  MOON_POSTN:      178.29d {+11h 53m 10s}   -4.39d {-04d 23' 34"}
  MOON_DIST:        76.44 [deg]
  MOON_ILLUM:      18 [%]
  GAL_COORDS:      338.47, -2.15 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      257.27,-25.12 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        Fermi-GBM Flight-calculated Coordinates.
  COMMENTS:        This trigger occurred at longitude,latitude = 202.18,25.55 [deg].
  

• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Thu 12 Nov 09 17:41:52 UT
  NOTICE_TYPE:     Swift-BAT GRB Position
  TRIGGER_NUM:     375659,   Seg_Num: 0
  GRB_RA:          257.728d {+17h 10m 55s} (J2000),
                   257.894d {+17h 11m 35s} (current),
                   256.885d {+17h 07m 32s} (1950)
  GRB_DEC:         -36.715d {-36d 42' 53"} (J2000),
                   -36.727d {-36d 43' 35"} (current),
                   -36.654d {-36d 39' 13"} (1950)
  GRB_ERROR:       3.00 [arcmin radius, statistical only]
  GRB_INTEN:       9453 [cnts]    Image_Peak=229 [image_cnts]
  TRIGGER_DUR:     1.024 [sec] 
  TRIGGER_INDEX:   148     E_range: 25-100 keV
  BKG_INTEN:       63386 [cnts]
  BKG_TIME:        63666.74 SOD {17:41:06.74} UT
  BKG_DUR:         8 [sec]
  GRB_DATE:        15147 TJD;   316 DOY;   09/11/12
  GRB_TIME:        63681.08 SOD {17:41:21.08} UT
  GRB_PHI:         -139.82 [deg]
  GRB_THETA:        39.34 [deg]
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     15.19 [sigma]
  IMAGE_SIGNIF:    7.23 [sigma]
  MERIT_PARAMS:     +1  +0  +0  +0  +2  -3 -100  +1 -84  +0 
  SUN_POSTN:       228.03d {+15h 12m 07s}  -17.87d {-17d 51' 56"}
  SUN_DIST:         32.33 [deg]   Sun_angle= -2.0 [hr] (East of Sun)
  MOON_POSTN:      178.29d {+11h 53m 10s}   -4.39d {-04d 23' 36"}
  MOON_DIST:        79.04 [deg]
  MOON_ILLUM:      18 [%]
  GAL_COORDS:      349.49,  1.74 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      259.90,-13.71 [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 = 274.79,-9.89 [deg].  
  

• red DSS finding chart ps-file
  
  
• GCN NOTICE
  

  TITLE:           GCN/FERMI NOTICE
  NOTICE_DATE:     Thu 12 Nov 09 17:41:57 UT
  NOTICE_TYPE:     Fermi-GBM Ground Position
  RECORD_NUM:      68
  TRIGGER_NUM:     279740477
  GRB_RA:          258.400d {+17h 13m 36s} (J2000),
                   258.579d {+17h 14m 19s} (current),
                   257.496d {+17h 09m 59s} (1950)
  GRB_DEC:         -44.070d {-44d 04' 11"} (J2000),
                   -44.081d {-44d 04' 50"} (current),
                   -44.012d {-44d 00' 42"} (1950)
  GRB_ERROR:       4.29 [deg radius, statistical only]
  DATA_SIGNIF:     21.20 [sigma]
  DATA_INTERVAL:   4.096 [sec]
  GRB_DATE:        15147 TJD;   316 DOY;   09/11/12
  GRB_TIME:        63675.82 SOD {17:41:15.82} UT
  GRB_PHI:         325.00 [deg]
  GRB_THETA:        80.00 [deg]
  E_RANGE:         44.032 - 279.965 [keV]
  LOC_ALGORITHM:   413 (Gnd S/W Version number)
  SUN_POSTN:       228.03d {+15h 12m 08s}  -17.87d {-17d 51' 56"}
  SUN_DIST:         36.65 [deg]   Sun_angle= -2.0 [hr] (East of Sun)
  MOON_POSTN:      178.29d {+11h 53m 11s}   -4.39d {-04d 23' 37"}
  MOON_DIST:        79.97 [deg]
  MOON_ILLUM:      18 [%]
  GAL_COORDS:      343.84, -3.00 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      261.10,-20.99 [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 12 Nov 09 17:41:54 UT
  NOTICE_TYPE:     Fermi-GBM Ground Position
  RECORD_NUM:      56
  TRIGGER_NUM:     279740477
  GRB_RA:          265.840d {+17h 43m 22s} (J2000),
                   266.009d {+17h 44m 02s} (current),
                   264.984d {+17h 39m 56s} (1950)
  GRB_DEC:         -37.830d {-37d 49' 47"} (J2000),
                   -37.834d {-37d 50' 01"} (current),
                   -37.808d {-37d 48' 27"} (1950)
  GRB_ERROR:       10.70 [deg radius, statistical only]
  DATA_SIGNIF:     10.80 [sigma]
  DATA_INTERVAL:   2.048 [sec]
  GRB_DATE:        15147 TJD;   316 DOY;   09/11/12
  GRB_TIME:        63675.82 SOD {17:41:15.82} UT
  GRB_PHI:         328.00 [deg]
  GRB_THETA:        88.00 [deg]
  E_RANGE:         44.032 - 279.965 [keV]
  LOC_ALGORITHM:   413 (Gnd S/W Version number)
  SUN_POSTN:       228.03d {+15h 12m 07s}  -17.87d {-17d 51' 56"}
  SUN_DIST:         38.67 [deg]   Sun_angle= -2.5 [hr] (East of Sun)
  MOON_POSTN:      178.29d {+11h 53m 11s}   -4.39d {-04d 23' 36"}
  MOON_DIST:        85.50 [deg]
  MOON_ILLUM:      18 [%]
  GAL_COORDS:      352.16, -4.24 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      266.61,-14.44 [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:     Thu 12 Nov 09 17:45:19 UT
  NOTICE_TYPE:     Swift-BAT GRB Lightcurve
  TRIGGER_NUM:     375659,   Seg_Num: 0
  GRB_RA:          257.728d {+17h 10m 55s} (J2000),
                   257.894d {+17h 11m 35s} (current),
                   256.885d {+17h 07m 32s} (1950)
  GRB_DEC:         -36.715d {-36d 42' 53"} (J2000),
                   -36.727d {-36d 43' 35"} (current),
                   -36.654d {-36d 39' 13"} (1950)
  GRB_DATE:        15147 TJD;   316 DOY;   09/11/12
  GRB_TIME:        63681.08 SOD {17:41:21.08} UT
  TRIGGER_INDEX:   148
  GRB_PHI:         -139.82 [deg]
  GRB_THETA:        39.34 [deg]
  DELTA_TIME:      6.00 [sec]
  TRIGGER_DUR:     1.024 [sec] 
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     15.19 [sigma]
  IMAGE_SIGNIF:    7.23 [sigma]
  LC_URL:          sw00375659000msb.lc
  SUN_POSTN:       228.03d {+15h 12m 08s}  -17.87d {-17d 51' 58"}
  SUN_DIST:         32.32 [deg]   Sun_angle= -2.0 [hr] (East of Sun)
  MOON_POSTN:      178.32d {+11h 53m 18s}   -4.41d {-04d 24' 27"}
  MOON_DIST:        79.01 [deg]
  MOON_ILLUM:      18 [%]
  GAL_COORDS:      349.49,  1.74 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      259.90,-13.71 [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 = 274.79,-9.89 [deg].  
  

  
• GCN NOTICE
  

  TITLE:           GCN/FERMI NOTICE
  NOTICE_DATE:     Thu 12 Nov 09 17:41:45 UT
  NOTICE_TYPE:     Fermi-GBM Flight Position
  RECORD_NUM:      57
  TRIGGER_NUM:     279740477
  GRB_RA:          252.717d {+16h 50m 52s} (J2000),
                   252.901d {+16h 51m 36s} (current),
                   251.784d {+16h 47m 08s} (1950)
  GRB_DEC:         -47.800d {-47d 47' 59"} (J2000),
                   -47.816d {-47d 48' 57"} (current),
                   -47.715d {-47d 42' 53"} (1950)
  GRB_ERROR:       9.98 [deg radius, statistical plus systematic]
  GRB_INTEN:       176 [cnts/sec]
  DATA_SIGNIF:     16.80 [sigma]
  INTEG_TIME:      4.096 [sec]
  GRB_DATE:        15147 TJD;   316 DOY;   09/11/12
  GRB_TIME:        63675.82 SOD {17:41:15.82} UT
  GRB_PHI:         323.00 [deg]
  GRB_THETA:        75.00 [deg]
  DATA_TIME_SCALE: 4.0960 [sec]
  HARD_RATIO:      0.75
  LOC_ALGORITHM:   3 (version number of)
  MOST_LIKELY:      91%  GRB
  2nd_MOST_LIKELY:   5%  Distant Particles
  DETECTORS:       0,0,0, 0,1,1, 0,0,0, 0,0,0, 0,0,
  SUN_POSTN:       228.03d {+15h 12m 07s}  -17.87d {-17d 51' 56"}
  SUN_DIST:         36.18 [deg]   Sun_angle= -1.7 [hr] (East of Sun)
  MOON_POSTN:      178.29d {+11h 53m 10s}   -4.39d {-04d 23' 34"}
  MOON_DIST:        76.44 [deg]
  MOON_ILLUM:      18 [%]
  GAL_COORDS:      338.47, -2.15 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      257.27,-25.12 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
  COMMENTS:        This trigger occurred at longitude,latitude = 202.18,25.55 [deg].  
  

• GCN Circular #10162
  V. Mangano (INAF-IASFPA), W. H. Baumgartner (GSFC/UMBC), S. Campana (INAF-OAB), P.A. Curran (MSSL-UCL), C. Guidorzi (U Ferrara), S. T. Holland (CRESST/USRA/GSFC), E. A. Hoversten (PSU), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), J. Mao (INAF-OAB), R. Margutti (Univ Bicocca&OAB), P. T. O'Brien (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), M. H. Siegel (PSU), M. Stamatikos (OSU/NASA/GSFC), M. A. Stark (PSU) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team:
  At 17:41:21 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 091112 (trigger=375659). Swift could not slew to the burst due to the Sun constraint. The BAT on-board calculated location is RA, Dec 257.728, -36.715 which is

     RA(J2000) = 17h 10m 55s
     Dec(J2000) = -36d 42' 53"
  

  with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a symmetrical peak structure with a duration of about 20 sec. The peak count rate was ~2000 counts/sec (15-350 keV), at ~5 sec after the trigger.
  Due to an observing constraint, Swift cannot slew to the BAT position. There will thus be no XRT or UVOT data for this trigger.
  Because this location is about 10 degrees from the Galactic center, we cannot rule out the possibility of this being a Galactic source. However, there are no known Galactic sources at this location.
  Burst Advocate for this burst is V. Mangano (vanessa AT ifc.inaf.it). 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 #10164
  M. S. Briggs (UAH) reports on behalf of the Fermi GBM Team:
  "At 17:41:15.82 UT on 12 Nov 2009, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 091112 (trigger 279740477 / 091112.737), which was also detected by the SWIFT-BAT (V. Mangano et al., GCN 10162) The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 82 degrees.
  The GBM light curve consists primarily of a broad peak, and has a duration of about 40 seconds.
  The time-averaged spectrum from T0-0.512 s to T0+24.064 s is best fit by a power law function with an exponential high energy cutoff. The power law index is -1.13 +/- 0.04 and the cutoff energy, parameterized as Epeak, is 750 +/- 120 keV. C-Stat = 717 for 483 degrees of freedom.
  The event fluence (10-1000 keV) in this time interval is (9.7 +/- 0.3)E-6 erg/cm^2.
  The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
• GCN Circular #10165
  D. M. Palmer (LANL), 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), V. Mangano (INAF-IASFPA), C. B. Markwardt (GSFC/UMD), 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-60 to T+483 sec from the recent telemetry downlink, we report further analysis of BAT GRB 091112 (trigger #375659) (Mangano, et al., GCN Circ. 10162). The BAT ground-calculated position is RA, Dec = 257.751, -36.729 deg, which is

     RA(J2000)  =  17h 11m 00.2s 
     Dec(J2000) = -36d 43' 43.4" 
  

  with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 40%.
  The mask-weighted light curve shows a roughly symmetric peak starting at ~T-15 sec, peaking at ~T+2 sec, and ending at ~T+40 sec. T90 (15-350 keV) is 17 +- 4 sec (estimated error including systematics).
  The time-averaged spectrum from T-10.0 to T+14.7 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.03 +- 0.14. The fluence in the 15-150 keV band is 2.1 +- 0.4 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.56 sec in the 15-150 keV band is 1.9 +- 0.5 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/375659/BA/
• GCN Circular #10170
  T. Sugasahara, M. Tashiro, Y. Terada, A. Endo, K. Onda, W. Iwakiri (Saitama U.), S. Sugita(Nagoya U.), K. Yamaoka (Aoyama Gakuin U.), M. Ohno, M. Suzuki, M. Kokubun, T. Takahashi (ISAS/JAXA), Y. E. Nakagawa, T. Tamagawa (RIKEN), N. Ohmori, A. Daikyuji, E. Sonoda, K. Kono, H. Hayashi, K. Noda, Y. Nishioka, M. Yamauchi (Univ. of Miyazaki), N. Vasquez (Tokyo Tech.), Y. Urata, H.M Lin (NCU), Y. Hanabata, T. Uehara, T. Takahashi, Y. Fukazawa (Hiroshima U.), T. Enoto, K. Nakazawa, K. Makishima (Univ. of Tokyo), S. Hong (Nihon U.), on behalf of the Suzaku WAM team, report
  The long GRB 091112 (Swift/BAT trigger #375659 ; Palmer et al., GCN 10165; Fermi/GBM trigger #279740477 ; Briggs et al., GCN 10164) triggered the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 2009-11-12 17:41:16.31 UT (=T0).
  The observed light curve shows a multi-peaked structure starting at T0-4s, ending at T0+16s with a duration (T90) of about 15 seconds. The fluence in 100-1000 keV was 7.85(-2.91,+0.37)x10^-6 erg/cm2. The 1-s peak flux measured from T0+7s was 1.25(-0.89,+0.09) photons/ cm2/s in the same energy range.
  Preliminary result shows that the time-averaged spectrum from T0-4s to T0+16s is well fitted by a power-law with exponential cutoff model:

  dN/dE ~ E^{-alpha} * exp(-(2-alpha)*E/Epeak) with
  alpha 1.19(-0.76,+0.45), and
  Epeak 628(-192,+607)keV (chi2/d.o.f. = 23.9/24).
  

  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
• 1109.5156 from 26 Sep 11
  C. R. A. Augusto et al.: Search for GeV gamma ray burst signal in the field of view of muon telescopes
  We present a search for the muon excess associated in time (preceding or following) with the trigger of gamma ray burst (GRB) detected by the satellite borne instruments. The 1 Hz rate data was collected at the sea level in the area located at 22S and 43W, inside the South Atlantic Anomaly (SAA) region and close to its center. Using 1 sec amd 10 sec time binning, we found the muon excess with significance $>5\sigma$ associated with the gamma ray burst GRB091112 observed by Swift BAT, Fermi GBM and Suzaku-WAM satellites. The detected muon time profile shows a rough peak at $\sim T+223$ sec ($5.2\sigma$), corresponding to 7 sec time interval during which 90% of the sub-MeV signal (T90) was detected by satellites. The FLUKA Monte Carlo simulation of the photon-to-muon conversion in the atmosphere shows that the observed muon excess can be explained by progenitor photons with energies above 10 GeV. This energy value is above the limits expected from the maximum synchrotron emission combined with the shock wave evolution. It shows constrains on the external shock synchrotron model for GRB emission in the GeV energy band and favors scenarios with overall afterglow spectrum, ranging from the optical-to-GeV photons. On the basis of the observed associations with the satellite data, we report confidence analysis of the background fluctuations and fluencies in the GeV energy region, that is important for better understanding of the GRB physics.