GRB070419B: 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 10:30:45 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger276212
======================================================================

  Trigger: 00276212      Segment: 000

  BAT Trigger Time: 198672247.872   [s; MET]
      Trigger Stop: 198672248.896   [s; MET]
               UTC: 2007-04-19T10:44:05.971820    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 315.718504424161   Dec: -31.2666947301328  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.02
     Image Trigger?:     NO
     Rate S/N Ratio:     17.4355957741627  [ if not an image trigger ]
     Image S/N Ratio:    7.02

  Analysis Position:   [ source = BAT ]
    RA: 315.718504424161   Dec: -31.2666947301328  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 315.705474720509   Dec: -31.264742642361  [deg; J2000]  
        { 21h 02m 49.3s , -31d 15' 53.1" }
         +/- 0.767497907055403 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.292500640885236 [arcmin] (formal 1-sigma fit error)
    SNR: 44.3908855467132
 
  Angular difference between the analysis and refined position is 0.678430 arcmin
 
  Partial Coding Fraction: 0.6640625    [ including projection effects ]

  Duration
     T90: 238.008000016212 +/- 14.3393349777117
        Measured from: -3.53200000524521
                   to: 234.476000010967     [s; relative to TRIGTIME]
     T50: 69.8039999902248 +/- 4.18186559772703
        Measured from: 17.7960000038147
                   to: 87.5999999940395     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.280000001192093     
                   to: 0.719999998807907     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -10.3440000116825     
                   to: 313.763999998569     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.991964   4.764220   3.259105   0.814429
           0.084496   0.087808   0.076904   0.065111 [error]
 Peak      0.045669   0.060110   0.048206   0.026747
           0.006275   0.006693   0.006102   0.005140 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  324.108  -10.344  313.764
T90   238.008   -3.532  234.476
T50    69.804   17.796   87.600
Peak    1.000   -0.280    0.720
 
 
====== 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: PL)
 
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      -1.652    -0.050      0.050       -           -               -         2.47e-03     -6.15e-05          6.14e-05      45.030   57
CPL     -1.625    -0.074      0.166      740.530    -587.453      -740.530      2.54e-03     -1.30e-04          4.68e-04      45.090   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
 
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      -1.255     -0.213     0.216       -           -               -         1.15e-02     -1.32e-03          1.32e-03      63.350   57
CPL     -1.254     -0.211     0.311     9999.350    -9999.350      -9999.350      1.16e-02     -1.06e-02          -6.90e-03      63.370   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   1.18e-06  1.97e-06  2.51e-06  6.41e-06  7.44e-06  1.21e-05   erg/cm2
      90%_error_low -5.89e-08 -5.58e-08 -8.16e-08 -4.71e-07 -1.93e-07 -5.14e-07   erg/cm2
      90%_error_hi   6.02e-08  5.56e-08  8.15e-08  4.97e-07  1.93e-07  5.34e-07   erg/cm2
Peak flux       PL   3.75e-01  4.37e-01  3.66e-01  5.18e-01  1.36e+00  1.70e+00   ph/cm2/s
      90%_error_low -8.25e-02 -5.93e-02 -5.09e-02 -1.41e-01 -1.60e-01 -2.03e-01   ph/cm2/s
      90%_error_hi   8.81e-02  5.80e-02  5.00e-02  1.74e-01  1.61e-01  2.07e-01   ph/cm2/s
 
Fluence        CPL   1.18e-06  1.97e-06  2.51e-06  6.41e-06  7.45e-06  1.21e-05   erg/cm2
      90%_error_low -7.76e-08 -4.93e-08 -8.15e-08 -1.53e-06 -2.12e-07 -1.54e-06   erg/cm2
      90%_error_hi   3.99e-08  5.85e-08  8.74e-08  4.87e-07  1.91e-07  2.76e-07   erg/cm2
Peak flux      CPL   3.75e-01  4.36e-01  3.64e-01  5.71e-01  1.36e+00  1.70e+00   ph/cm2/s
      90%_error_low     N/A   -5.97e-02 -5.01e-02 -5.54e-01 -1.61e-01 -2.69e-01   ph/cm2/s
      90%_error_hi      N/A    5.89e-02  5.24e-02  -4.59e-01  1.61e-01  1.77e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  315.7055   -31.2647   0.0043    30.2865    20.1055         3.0959317     44.391 TRIG_00276212                 
 
Foreground time interval of the image:
-10.344  16.029 (delta_t =  26.373 [sec])
Background time interval of the image:
-239.872 -10.344 (delta_t = 229.528 [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  -10.344 sec. to  313.764 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.6521     ( -0.0500965   0.0499664 )
Norm@50keV  : 2.47008E-03    ( -6.14873e-05   6.14476e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.03 using 59 PHA bins.
# Reduced chi-squared =         0.7900 for     57 degrees of freedom 
# Null hypothesis probability =   8.743813e-01
 
Photon flux (15-150 keV)    in 324.1 sec: 0.322767 ( -0.009068  0.009107 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.4449e-06 ( -1.93048e-07  1.9344e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -10.344 sec. to  313.764 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.62495     ( -0.0479461   0.191384 )
Epeak [keV] : 740.530      ( -9845.6 -9998.68 )
Norm@50keV  : 2.54317E-03    ( -6.16165e-05   0.000536236 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.09 using 59 PHA bins.
# Reduced chi-squared =         0.8052 for     56 degrees of freedom 
# Null hypothesis probability =   8.513361e-01
 
Photon flux (15-150 keV)    in 324.1 sec: 0.322792 ( -0.01047  0.008941 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.44542e-06 ( -2.1241e-07  1.90635e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -0.280 sec. to    0.720 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.25473     ( -0.212839   0.216061 )
Norm@50keV  : 1.15179E-02    ( -0.00131769   0.00131662 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.35 using 59 PHA bins.
# Reduced chi-squared =          1.111 for     57 degrees of freedom 
# Null hypothesis probability =   2.624044e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.36332 ( -0.1604  0.16099 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.15141e-07 ( -1.48458e-08  1.49868e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.280 sec. to    0.720 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.455     ( -0.211589   0.310895 )
Epeak [keV] : 149.359      ( -9999.36 -9999.36 )
Norm@50keV  : 2.28158E-03    ( -0.00131184   0.00238483 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.29 using 59 PHA bins.
# Reduced chi-squared =          1.095 for     56 degrees of freedom 
# Null hypothesis probability =   2.919514e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.36320 ( -0.1607  0.16076 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.15088e-07 ( 0  0 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 238.008 sec.
Hardness ratio (energy fluence ratio) = 1.27274131212

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

S(15-50 keV)  = 3.154194e-06
S(50-150 keV) = 4.290705e-06

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 = 5.484465900865042E-01, IMY = -2.007623712409803E-01

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:
-239.872000 -10.344000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
288.7748  10.9375    1.8  36.9  117.9   2.4443   6.4    1.5	GRS 1915+105                  
299.5896  35.1950    0.6  43.3  157.9   7.8748  19.6    0.4	Cyg X-1                       
308.2579  40.9334    6.2  45.0  170.4   0.6090   1.8    6.8	Cyg X-3                       
326.0222  38.3288  222.9  40.3 -170.2  -0.0122  -0.1    7.0	Cyg X-2                       
331.0812   8.9220    2.7  13.2 -138.5   0.6725   4.3 ------	UNKNOWN                       
329.3924  54.7546    2.6  56.9 -169.2   2.8126   4.5 ------	UNKNOWN                       
339.0527  56.0991    2.7  59.4 -163.2   4.7131   4.2 ------	UNKNOWN                       
  7.8822 -30.3529    3.1  50.7  -44.5   3.3923   3.7 ------	UNKNOWN                       
  2.9809  12.6850    3.0  41.8 -104.7   3.2605   3.9 ------	UNKNOWN                       
  1.2843  26.3889    2.5  46.1 -123.7   3.6642   4.7 ------	UNKNOWN                       

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

Time interval of the image:
-10.344000 16.028600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
288.7755  10.9592   76.0  36.9  117.9  -0.0210  -0.2    1.6	GRS 1915+105                  
299.5466  35.0929    5.4  43.3  157.7  -0.2330  -2.1    6.9	Cyg X-1                       
308.2054  40.8177   29.5  44.9  170.3   0.0417   0.4    9.2	Cyg X-3                       
326.0085  38.3914    7.5  40.4 -170.2  -0.1200  -1.5    8.7	Cyg X-2                       
315.7055 -31.2648    0.3  30.3   20.1   3.0956  44.4 ------	UNKNOWN                       
324.7055  -7.8112    2.7   6.0   -4.4   0.2043   4.2 ------	UNKNOWN                       
  1.8340  14.4079    2.9  41.3 -107.8   0.7743   3.9 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
69.628600 387.628580
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
270.4319 -25.1294    7.2  40.1  106.6  -1.2239  -1.6    8.6	GX 5-1                        
270.2829 -25.6257    6.2  40.1  105.8  -1.3692  -1.8    7.1	GRS 1758-258                  
273.9684 -14.1233    4.3  41.8  124.0   1.9905   2.7    5.7	GX 17+2                       
276.0698 -30.3530   12.2  33.9  100.5  -0.3711  -0.9    7.5	H1820-303                     
285.0290 -24.9241   36.2  27.7  115.0   0.0818   0.3    0.4	HT1900.1-2455                 
288.8032  10.9316    1.6  49.5  163.7   4.3156   7.2    0.9	GRS 1915+105                  
296.1246 -17.1235    3.5  22.7  143.4   0.6507   3.3 ------	UNKNOWN                       
315.6992 -31.2649    0.4   0.0  140.5   4.7358  27.0 ------	UNKNOWN                       
339.2061 -15.7555    3.2  26.4 -101.0   0.8747   3.6 ------	UNKNOWN                       
313.0878  28.0294    3.3  59.4 -163.2   4.8124   3.5 ------	UNKNOWN                       
 11.8940 -32.7143    4.0  47.1  -53.1   2.9117   2.8 ------	UNKNOWN