GRB110407A: 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 13 23:12:48 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger450884
======================================================================

  Trigger: 00450884      Segment: 000

  BAT Trigger Time: 323878008   [s; MET]
      Trigger Stop: 323878072   [s; MET]
               UTC: 2011-04-07T14:06:41.167860    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 185.996625275413   Dec: 15.7178020980355  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    14.72
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    14.72

  Analysis Position:   [ source = BAT ]
    RA: 185.996625275413   Dec: 15.7178020980355  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 186.02373181947   Dec: 15.7237201700124  [deg; J2000]  
        { 12h 24m 05.7s , +15d 43' 25.4" }
         +/- 1.47000361396692 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.571553597285787 [arcmin] (formal 1-sigma fit error)
    SNR: 17.5425244608379
 
  Angular difference between the analysis and refined position is 1.605319 arcmin
 
  Partial Coding Fraction: 0.7734375    [ including projection effects ]

  Duration
     T90: 155.567999958992 +/- 21.1666227540407
        Measured from: 2.35600000619888
                   to: 157.923999965191     [s; relative to TRIGTIME]
     T50: 71.635999917984 +/- 21.0609268757043
        Measured from: 26.3320000171661
                   to: 97.9679999351501     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 27.6399999856949     
                   to: 28.6399999856949     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.89999997615814     
                   to: 178.51599997282     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.013862   1.361866   0.774008   0.110093
           0.074262   0.076154   0.067491   0.060194 [error]
 Peak      0.016251   0.019724   0.022775   0.011490
           0.005872   0.006217   0.005445   0.004633 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  181.416   -2.900  178.516
T90   155.568    2.356  157.924
T50    71.636   26.332   97.968
Peak    1.000   27.640   28.640
 
 
====== 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: CPL)
 
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      -1.731    -0.126      0.124       -           -               -         1.13e-03     -8.67e-05          8.59e-05      54.710   57
CPL     -0.737    -0.594      0.690       57.781      -8.747        21.701      3.86e-03     -1.98e-03          5.14e-03      45.840   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      -1.057     -0.479     0.532       -           -               -         4.55e-03     -1.19e-03          1.17e-03      58.680   57
CPL     -1.063     -0.472     0.546     9999.360    -9999.360      -9999.360      4.58e-03     -1.17e-03          1.28e-02      58.690   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   3.26e-07  5.20e-07  6.26e-07  1.48e-06  1.90e-06  2.95e-06   erg/cm2
      90%_error_low -3.46e-08 -3.57e-08 -6.50e-08 -2.94e-07 -1.51e-07 -3.58e-07   erg/cm2
      90%_error_hi   3.56e-08  3.57e-08  6.53e-08  3.40e-07  1.53e-07  3.95e-07   erg/cm2
Peak flux       PL   1.23e-01  1.61e-01  1.55e-01  2.65e-01  5.26e-01  7.03e-01   ph/cm2/s
      90%_error_low -6.22e-02 -5.50e-02 -4.53e-02 -1.38e-01 -1.40e-01 -1.91e-01   ph/cm2/s
      90%_error_hi   7.34e-02  5.14e-02  4.37e-02  2.23e-01  1.40e-01  2.10e-01   ph/cm2/s
 
Fluence        CPL   2.84e-07  5.74e-07  6.24e-07  3.78e-07  1.72e-06  1.86e-06   erg/cm2
      90%_error_low -4.23e-08 -4.77e-08 -7.58e-08 -1.92e-07 -1.71e-07 -2.58e-07   erg/cm2
      90%_error_hi   4.28e-08  4.90e-08  7.41e-08  4.13e-07  1.78e-07  4.38e-07   erg/cm2
Peak flux      CPL   1.23e-01  1.59e-01  1.54e-01  2.97e-01  5.32e-01  7.38e-01   ph/cm2/s
      90%_error_low     N/A       N/A       N/A       N/A   -1.74e-01 -2.73e-01   ph/cm2/s
      90%_error_hi      N/A       N/A       N/A       N/A    1.64e-01  2.07e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  186.0237    15.7237   0.0109    19.9952   135.4237         1.9565756     17.543 TRIG_00450884                 
 
Foreground time interval of the image:
 -2.900  73.301 (delta_t =  76.201 [sec])
Background time interval of the image:
-239.000  -2.900 (delta_t = 236.100 [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   -2.900 sec. to  178.516 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.7308     ( -0.126449   0.123702 )
Norm@50keV  : 1.13137E-03    ( -8.67424e-05   8.58899e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.71 using 59 PHA bins.
# Reduced chi-squared =         0.9598 for     57 degrees of freedom 
# Null hypothesis probability =   5.614484e-01
 
Photon flux (15-150 keV)    in 181.4 sec: 0.151918 ( -0.010511  0.01052 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.89626e-06 ( -1.51056e-07  1.52996e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -2.900 sec. to  178.516 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.737271     ( -0.593732   0.689956 )
Epeak [keV] : 57.7805      ( -8.74693 21.7011 )
Norm@50keV  : 3.86386E-03    ( -0.00198444   0.00514088 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.84 using 59 PHA bins.
# Reduced chi-squared =         0.8185 for     56 degrees of freedom 
# Null hypothesis probability =   8.318219e-01
 
Photon flux (15-150 keV)    in 181.4 sec: 0.144351 ( -0.011358  0.011364 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.7242e-06 ( -1.71249e-07  1.78401e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   27.640 sec. to   28.640 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.0572     ( -0.47904   0.531931 )
Norm@50keV  : 4.55356E-03    ( -0.00118537   0.00117192 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.68 using 59 PHA bins.
# Reduced chi-squared =          1.030 for     57 degrees of freedom 
# Null hypothesis probability =   4.135429e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.526207 ( -0.139686  0.140224 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.82848e-08 ( -1.35927e-08  1.38007e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   27.640 sec. to   28.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.06256     ( -0.472666   0.54576 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 4.58190E-03    ( -0.00117029   0.0128067 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.69 using 59 PHA bins.
# Reduced chi-squared =          1.048 for     56 degrees of freedom 
# Null hypothesis probability =   3.770737e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.531776 ( -0.174259  0.163824 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.85333e-08 ( -1.62766e-08  1.60619e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 155.568 sec.
Hardness ratio (energy fluence ratio) = 1.08822807696

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

S(15-50 keV)  = 8.581681e-07
S(50-150 keV) = 8.660431e-07

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 = -2.591940828177663E-01, IMY = -2.553889295409928E-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:
-239.000000 -2.900000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9809 -15.6351    0.9  50.1   -3.6   5.5792  13.3    0.3	Sco X-1                       
208.0547  48.8844    2.9  31.5 -131.2   0.9656   3.9 ------	UNKNOWN                       
246.1343  17.3208    2.1  37.5  -48.7   1.4570   5.6 ------	UNKNOWN                       
261.6547  -5.9384    2.5  59.0  -24.3   5.8424   4.6 ------	UNKNOWN                       
176.5633  69.4347    5.8  55.3 -145.2   2.4447   2.0 ------	UNKNOWN                       

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

Time interval of the image:
-2.900000 73.300610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
245.0357 -15.7160    4.7  50.2   -3.6   0.5959   2.4    5.6	Sco X-1                       
186.0237  15.7242    0.7  20.0  135.4   1.9645  17.6 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
146.100600 963.035900
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
187.8588  -1.4241    2.6  17.3  108.5   1.9680   4.4 ------	UNKNOWN                       
200.0085  11.6216    2.6  14.2   39.9   1.8163   4.3 ------	UNKNOWN                       
239.6768  42.4881    2.6  52.8  -17.1   5.0424   4.4 ------	UNKNOWN                       
128.2432  17.0097    5.7  55.2 -145.2   6.8266   2.1 ------	UNKNOWN