GRB071122: Summary Image Light curves Spectra Distribution Others

Analysis Summary

Notes:

• 1) No attempt has been made to eliminate the non-significant decimal places.
• 2) This batgrbproduct analysis is done using the HEASARC data.
• 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 20 05:20:48 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger297114
======================================================================

  Trigger: 00297114      Segment: 000

  BAT Trigger Time: 217387408   [s; MET]
      Trigger Stop: 217387472   [s; MET]
               UTC: 2007-11-22T01:23:25.621540    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 276.58149464452   Dec: 47.063184122741  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.13
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.13

  Analysis Position:   [ source = BAT ]
    RA: 276.58149464452   Dec: 47.063184122741  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 276.56960980633   Dec: 47.1044142651593  [deg; J2000]  
        { 18h 26m 16.7s , +47d 06' 15.9" }
         +/- 2.35717740298496 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.1941680639418 [arcmin] (formal 1-sigma fit error)
    SNR: 8.93571737461226
 
  Angular difference between the analysis and refined position is 2.521012 arcmin
 
  Partial Coding Fraction: 0.6953125    [ including projection effects ]

  Duration
     T90: 71.4320000112057 +/- 13.9282791539919
        Measured from: -22.5879999995232
                   to: 48.8440000116825     [s; relative to TRIGTIME]
     T50: 35.5879999995232 +/- 14.1940811724705
        Measured from: -7.47200000286102
                   to: 28.1159999966621     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 2.99599999189377     
                   to: 3.99599999189377     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -29.4120000004768     
                   to: 55.6920000016689     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.401253   0.293999   0.282138   0.022217
           0.058751   0.060096   0.052350   0.045368 [error]
 Peak      0.025319   0.010959   0.011065   0.001905
           0.006515   0.006571   0.005607   0.004879 [error]

     [ fluence units of on-axis counts / fully illuminated detector ] 

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   85.104  -29.412   55.692
T90    71.432  -22.588   48.844
T50    35.588   -7.472   28.116
Peak    1.000    2.996    3.996
 
 
====== Spectral Analysis Summary =====================================
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^{Ph_index}
Ph_90err   : 90% error of the photon index
Epeak      : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm       : normalization at 50 keV in both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedo
 
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: N/A)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -1.622    -0.308      0.297       -           -               -         7.76e-04     -1.43e-04          1.40e-04      74.420   57
CPL     -1.420    -0.500      1.229      138.857    -138.857      -138.857      9.91e-04     -9.91e-04          3.20e-03      74.310   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -2.300     -1.278     0.858       -           -               -         2.35e-03     -2.35e-03          1.50e-03      41.910   57
CPL     -1.990     -0.020     5.028        3.396      N/A           N/A         3.05e-03        N/A               N/A         42.180   56
 
 
=== Fluence/Peak Flux Summary ===
 
              Model    Band1     Band2     Band3     Band4     Band5     Total
                       15-25     25-50    50-100    100-350    15-150    15-350    keV
Fluence         PL   9.46e-08  1.61e-07  2.10e-07  5.51e-07  6.16e-07  1.02e-06   erg/cm2
      90%_error_low -2.49e-08 -2.77e-08 -5.09e-08 -2.35e-07 -1.20e-07 -2.89e-07   erg/cm2
      90%_error_hi   2.63e-08  2.75e-08  5.08e-08  3.29e-07  1.22e-07  3.63e-07   erg/cm2
Peak flux       PL   2.10e-01  1.32e-01  5.37e-02  2.95e-02  4.11e-01  4.25e-01   ph/cm2/s
      90%_error_low -1.06e-01 -6.50e-02 -4.18e-02 -2.95e-02 -1.59e-01 -1.69e-01   ph/cm2/s
      90%_error_hi   1.09e-01  5.51e-02  5.14e-02  8.35e-02  1.59e-01  1.71e-01   ph/cm2/s
 
Fluence        CPL   9.20e-08  1.65e-07  2.12e-07  3.97e-07  6.07e-07  8.66e-07   erg/cm2
      90%_error_low -2.89e-08 -3.10e-08 -5.27e-08 -3.12e-07 -1.29e-07 -3.49e-07   erg/cm2
      90%_error_hi   2.68e-08  3.51e-08  5.46e-08  2.17e-07  1.28e-07  2.53e-07   erg/cm2
Peak flux      CPL   1.95e-01  7.48e-02  1.75e-02  5.96e-03  2.91e-01  2.93e-01   ph/cm2/s
      90%_error_low -1.12e-01 -7.48e-02     N/A   -5.96e-03     N/A       N/A     ph/cm2/s
      90%_error_hi   1.12e-01  1.05e-01     N/A    4.83e-02     N/A       N/A     ph/cm2/s
 
======================================================================

Image

Pre-slew 15.0-350.0 keV image (Event data)

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  276.5696    47.1044   0.0215    31.7026     8.6013         1.1692195      8.936 TRIG_00297114                 
 
Foreground time interval of the image:
-29.412  55.692 (delta_t =  85.104 [sec])
Background time interval of the image:
-239.000 -29.412 (delta_t = 209.588 [sec])

Light Curves

Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.

Full-time range; 1 s binning

Other quick-look light curves:

• 64 ms binning (zoomed)
• 16 ms binning (zoomed)
• 8 ms binning (zoomed)
• 2 ms binning (zoomed)
• SN=5 or 10 s binning (full-time range)
• Raw light curve

Spectra

Notes:

• 1) The fitting includes the systematic errors.
• 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
• 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.

Time averaged spectrum fit using the average DRM

Power-law model

Time interval is from  -29.412 sec. to   55.692 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.62212     ( -0.308146   0.297102 )
Norm@50keV  : 7.76377E-04    ( -0.000142727   0.000139601 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          74.42 using 59 PHA bins.
# Reduced chi-squared =          1.306 for     57 degrees of freedom 
# Null hypothesis probability =   6.045512e-02
 
Photon flux (15-150 keV)    in 85.1 sec: 0.100467 ( -0.0171172  0.017143 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.16382e-07 ( -1.19675e-07  1.2193e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -29.412 sec. to   55.692 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.42012     ( -0.500188   1.22892 )
Epeak [keV] : 138.857      ( -138.837 -138.837 )
Norm@50keV  : 9.90803E-04    ( -0.00099085   0.00320361 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          74.31 using 59 PHA bins.
# Reduced chi-squared =          1.327 for     56 degrees of freedom 
# Null hypothesis probability =   5.130064e-02
 
Photon flux (15-150 keV)    in 85.1 sec: 9.96953E-02 ( -0.0175948  0.0175277 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.06903e-07 ( -1.28802e-07  1.28371e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    2.996 sec. to    3.996 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.30029     ( -1.2781   0.85848 )
Norm@50keV  : 2.35046E-03    ( -0.00235018   0.00149808 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.91 using 59 PHA bins.
# Reduced chi-squared =         0.7353 for     57 degrees of freedom 
# Null hypothesis probability =   9.328582e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.410871 ( -0.15897  0.158878 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.24657e-08 ( -1.13849e-08  1.29822e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    2.996 sec. to    3.996 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.86113     ( -0.019735   5.02802 )
Epeak [keV] : 277.565      (   )
Norm@50keV  : 1.18843E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.32 using 59 PHA bins.
# Reduced chi-squared =         0.7378 for     56 degrees of freedom 
# Null hypothesis probability =   9.288152e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.290645 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

S(15-50 keV) vs. S(50-150 keV) plot

S(15-50 keV)  = N/A
S(50-150 keV) = N/A

The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.

Mask shadow pattern

IMX = 6.107290638466494E-01, IMY = -9.237778843154515E-02

Spacecraft aspect plot

Bright source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

Time interval of the image:
-239.000000 -29.412000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4343  35.3363    5.1  41.1  -22.1   0.6089   2.3    1.2	Her X-1                       
268.2106  -1.4381    5.8  37.2  -85.6   1.2414   2.0    9.5	SW J1753.5-0127               
289.0081  10.9282  118.4  13.5  -98.2   0.0168   0.1   12.4	GRS 1915+105                  
299.5897  35.2089    0.2  14.4   41.0   8.6110  49.6    0.4	Cyg X-1                       
308.1183  40.9532    1.4  21.6   57.5   1.7786   8.4    0.4	Cyg X-3                       
326.1564  38.2976   11.2  29.4   85.3   0.3250   1.0    1.6	Cyg X-2                       
272.2755  40.0772    2.1  29.5   -5.9   1.0891   5.4 ------	UNKNOWN                       
237.2281  37.2250    4.2  55.1  -20.8   1.6251   2.7 ------	UNKNOWN                       
270.9032  -9.8290    4.0  41.0  -98.2   3.0913   2.9 ------	UNKNOWN                       

Pre-slew background subtracted image of 15-350 keV band

Time interval of the image:
-29.412000 55.692000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6453  35.3765   11.2  41.0  -22.0  -0.1681  -1.0    9.4	Her X-1                       
268.5130  -1.4534    3.2  36.9  -85.9  -0.9260  -3.6    8.7	SW J1753.5-0127               
288.9318  10.8652   17.0  13.6  -98.1   0.0707   0.7    9.2	GRS 1915+105                  
299.6473  35.3812    3.2  14.5   41.1  -0.4064  -3.6   11.1	Cyg X-1                       
308.2679  41.0391   14.0  21.8   57.7   0.1071   0.8    8.8	Cyg X-3                       
326.1047  38.2495    6.7  29.4   85.3  -0.3166  -1.7    5.4	Cyg X-2                       
276.5694  47.1043    1.3  31.7    8.6   1.1594   8.9 ------	UNKNOWN                       
318.8791 -21.8620    2.1  47.1 -168.4   1.0257   5.5 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
126.500600 963.070000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4598  35.5046   11.7  20.1  -64.9   0.5736   1.0    9.7	Her X-1                       
288.9486  10.9937    7.6  37.6 -148.0  -1.1181  -1.5    9.3	GRS 1915+105                  
299.5978  35.2062    0.2  20.9  168.5  34.1714  70.6    0.5	Cyg X-1                       
308.1256  41.0125    1.1  23.3  145.6   5.6041  10.1    3.7	Cyg X-3                       
326.0687  38.1968    3.9  36.8  137.7   2.8088   2.9    8.9	Cyg X-2                       
308.1064  37.6548    1.5  24.9  152.8   4.4089   7.9 ------	UNKNOWN                       
307.7713  -3.5061    2.9  57.5 -165.6  10.0210   4.0 ------	UNKNOWN