GRB050315: 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: Wed Jan 22 22:47:13 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger111063
======================================================================

  Trigger: 00111063      Segment: 000

  BAT Trigger Time: 132613181.952   [s; MET]
      Trigger Stop: 132613182.976   [s; MET]
               UTC: 2005-03-15T20:59:42.518900    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 306.472217474461   Dec: -42.5872492239099  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8
     Image Trigger?:     NO
     Rate S/N Ratio:     17.1464281994822  [ if not an image trigger ]
     Image S/N Ratio:    8

  Analysis Position:   [ source = BAT ]
    RA: 306.472217474461   Dec: -42.5872492239099  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 306.479471365526   Dec: -42.5890309649915  [deg; J2000]  
        { 20h 25m 55.1s , -42d 35' 20.5" }
         +/- 1.12948375376991 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.322076498974319 [arcmin] (formal 1-sigma fit error)
    SNR: 25.5608645674576
 
  Angular difference between the analysis and refined position is 0.337798 arcmin
 
  Partial Coding Fraction: 0.515625    [ including projection effects ]

  Duration
     T90: 95.4000000208616 +/- 13.9633835385111
        Measured from: -47.8080000132322
                   to: 47.5920000076294     [s; relative to TRIGTIME]
     T50: 24.3159999996424 +/- 1.49064818568338
        Measured from: 0.219999998807907
                   to: 24.5359999984503     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 24.6039999872446     
                   to: 25.6039999872446     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -55.9800000041723     
                   to: 69.1799999922514     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.150074   2.172871   1.122425   0.254067
           0.076082   0.072933   0.060369   0.049813 [error]
 Peak      0.079359   0.078248   0.042491   0.000424
           0.007981   0.007673   0.005966   0.004592 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  125.160  -55.980   69.180
T90    95.400  -47.808   47.592
T50    24.316    0.220   24.536
Peak    1.000   24.604   25.604
 
 
====== 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      -2.085    -0.085      0.084       -           -               -         2.73e-03     -1.32e-04          1.31e-04      50.580   57
CPL     -1.766    -0.171      0.357       33.872     -28.642        13.154      4.02e-03     -1.02e-03          2.14e-03      47.840   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      -2.079     -0.195     0.186       -           -               -         1.21e-02     -1.59e-03          1.56e-03      52.410   57
CPL     -1.387     -0.473     0.848       38.134      N/A           N/A         3.00e-02        N/A               N/A         49.570   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   7.58e-07  9.77e-07  9.21e-07  1.53e-06  3.17e-06  4.19e-06   erg/cm2
      90%_error_low -5.30e-08 -4.17e-08 -6.18e-08 -2.05e-07 -1.42e-07 -2.64e-07   erg/cm2
      90%_error_hi   5.43e-08  4.17e-08  6.20e-08  2.26e-07  1.43e-07  2.77e-07   erg/cm2
Peak flux       PL   8.72e-01  6.24e-01  2.96e-01  1.97e-01  1.89e+00  1.99e+00   ph/cm2/s
      90%_error_low -1.34e-01 -6.75e-02 -4.95e-02 -5.63e-02 -2.07e-01 -2.15e-01   ph/cm2/s
      90%_error_hi   1.38e-01  6.75e-02  4.99e-02  6.81e-02  2.08e-01  2.15e-01   ph/cm2/s
 
Fluence        CPL   7.21e-07  1.00e-06  9.22e-07  9.36e-07  3.08e-06  3.58e-06   erg/cm2
      90%_error_low -6.42e-08 -5.05e-08 -6.48e-08 -3.55e-07 -1.68e-07 -4.03e-07   erg/cm2
      90%_error_hi   6.51e-08  5.12e-08  6.49e-08  5.81e-07  1.69e-07  4.96e-07   erg/cm2
Peak flux      CPL   8.11e-01  6.78e-01  2.99e-01  8.61e-02  1.85e+00  1.87e+00   ph/cm2/s
      90%_error_low -1.51e-01 -8.64e-02 -5.66e-02 -5.26e-02 -2.11e-01 -2.21e-01   ph/cm2/s
      90%_error_hi   1.52e-01  8.97e-02  5.56e-02  1.17e-01  2.11e-01  2.29e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  306.4795   -42.5890   0.0075    39.5253   -27.2991         3.0943002     25.561 TRIG_00111063                 
 
Foreground time interval of the image:
-55.980  14.149 (delta_t =  70.129 [sec])
Background time interval of the image:
-299.952 -55.980 (delta_t = 243.972 [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  -55.980 sec. to   69.180 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.08518     ( -0.0852708   0.0837839 )
Norm@50keV  : 2.72708E-03    ( -0.000132196   0.000131115 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.58 using 59 PHA bins.
# Reduced chi-squared =         0.8875 for     57 degrees of freedom 
# Null hypothesis probability =   7.129094e-01
 
Photon flux (15-150 keV)    in 125.2 sec: 0.425964 ( -0.019498  0.019574 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.16844e-06 ( -1.42469e-07  1.4306e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -55.980 sec. to   69.180 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.76608     ( -0.170635   0.35654 )
Epeak [keV] : 33.8723      ( -28.6419 13.1545 )
Norm@50keV  : 4.02125E-03    ( -0.00101682   0.00214457 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.84 using 59 PHA bins.
# Reduced chi-squared =         0.8542 for     56 degrees of freedom 
# Null hypothesis probability =   7.729770e-01
 
Photon flux (15-150 keV)    in 125.2 sec: 0.416615 ( -0.021587  0.021634 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.07924e-06 ( -1.68364e-07  1.68594e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   24.604 sec. to   25.604 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.07889     ( -0.195408   0.185986 )
Norm@50keV  : 1.21074E-02    ( -0.00158662   0.00155549 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.41 using 59 PHA bins.
# Reduced chi-squared =         0.9195 for     57 degrees of freedom 
# Null hypothesis probability =   6.476844e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.88535 ( -0.20748  0.20772 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.12292e-07 ( -1.35413e-08  1.36846e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   24.604 sec. to   25.604 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.38721     ( -0.472841   0.847929 )
Epeak [keV] : 38.1340      (   )
Norm@50keV  : 2.99777E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.57 using 59 PHA bins.
# Reduced chi-squared =         0.8851 for     56 degrees of freedom 
# Null hypothesis probability =   7.154025e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.84923 ( -0.2109  0.21101 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 95.4 sec.
Hardness ratio (energy fluence ratio) = 0.942692328488

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

S(15-50 keV)  = 1.7340825e-06
S(50-150 keV) = 1.4343769e-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 = 7.331840132508618E-01, IMY = 3.784100713181509E-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:
-299.952000 -55.980000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9861 -15.6408    0.3  37.0   77.1  25.7064  35.1    0.4	Sco X-1                       
254.6098  35.5283    0.0  51.8  152.1  -0.2816  -0.2   13.4	Her X-1                       
255.8313 -37.7117   14.6  37.2   36.7   0.4115   0.8   10.8	4U 1700-377                   
256.3693 -36.4418   11.6  36.0   37.7   0.5440   1.0    3.4	GX 349+2                      
263.1728 -24.6342   20.8  23.9   48.3  -0.1509  -0.6   11.2	GX 1+4                        
264.9127 -44.4783    6.7  38.4   21.1   0.7155   1.7    7.5	4U 1735-44                    
268.4387  -1.3653   94.8  15.9  119.6  -0.0302  -0.1    6.7	SW J1753.5-0127               
270.3171 -25.0384    2.3  19.6   35.3   1.1190   5.0    3.0	GX 5-1                        
270.2456 -25.7554    3.7  20.2   34.2   0.6832   3.1    3.2	GRS 1758-258                  
273.9828 -14.0479    1.9   9.5   59.5   1.3159   6.0    1.5	GX 17+2                       
275.9818 -30.4231    7.3  22.1   15.7   0.3465   1.6    4.5	H1820-303                     
285.1937 -24.8643    9.1  15.9   -8.5   0.3048   1.3    9.2	HT1900.1-2455                 
288.8091  10.9381    1.1  21.1 -161.3   2.9014  10.8    0.8	GRS 1915+105                  
299.5741  35.2058    0.7  47.3 -159.9   6.1998  17.3    0.8	Cyg X-1                       
308.0487  40.8764  154.3  55.4 -155.6  -0.0574  -0.1    5.4	Cyg X-3                       
262.9850 -33.7903    8.2  30.4   34.0   0.5330   1.4    2.7	GX 354-0                      
247.9955  -9.4895    3.5  33.9   87.5   2.2550   3.3 ------	UNKNOWN                       
244.6140 -43.7433    3.8  47.6   37.7   3.5651   3.0 ------	UNKNOWN                       
262.1110  37.4421    2.8  50.3  160.0   3.2087   4.2 ------	UNKNOWN                       
269.5407 -27.7046    2.6  22.1   32.4   1.0317   4.5 ------	UNKNOWN                       
273.7292 -12.0689    2.6   9.0   71.4   0.9605   4.6 ------	UNKNOWN                       
	UNKNOWN                       
	UNKNOWN                       
	UNKNOWN                       

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

Time interval of the image:
-55.980000 14.148590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9293 -15.5905    5.1  37.1   77.2  -0.5947  -2.3    4.2	Sco X-1                       
254.4580  35.3418 2165.6  51.7  151.8   0.0019   0.0    0.0	Her X-1                       
256.1462 -37.9239    6.7  37.2   36.1   0.2761   1.7    8.9	4U 1700-377                   
256.4357 -36.4275  136.9  36.0   37.7  -0.0128  -0.1    0.3	GX 349+2                      
263.1731 -24.6274   13.2  23.9   48.4   0.0886   0.9   11.4	GX 1+4                        
264.9147 -44.4434   11.5  38.4   21.1   0.1363   1.0    7.4	4U 1735-44                    
268.2562  -1.3150  279.9  16.1  119.4   0.0036   0.0   10.6	SW J1753.5-0127               
270.1246 -25.0937    4.5  19.7   35.6   0.2308   2.5    8.7	GX 5-1                        
270.4360 -25.8999    6.0  20.2   33.5   0.1732   1.9   11.9	GRS 1758-258                  
273.9860 -14.1603    8.5   9.6   58.9   0.1132   1.4    7.5	GX 17+2                       
275.9355 -30.2181    8.6  21.9   16.0   0.1147   1.3    9.0	H1820-303                     
284.8796 -24.9444    6.5  15.9   -7.4  -0.1578  -1.8    8.6	HT1900.1-2455                 
288.7714  11.0394    4.8  21.2 -161.4   0.2183   2.4    5.8	GRS 1915+105                  
299.7417  35.0338    0.0  47.2 -159.6  -0.1835  -1.1   12.5	Cyg X-1                       
307.9973  40.8345 2143.9  55.3 -155.6  -0.0015  -0.0    8.7	Cyg X-3                       
263.1028 -33.9695    4.0  30.4   33.6  -0.3497  -2.9    9.9	GX 354-0                      
300.1209  17.1732    2.2  31.7 -145.4   0.5023   5.1 ------	UNKNOWN                       
306.4795 -42.5890    0.5  39.5  -27.3   3.0946  25.6 ------	UNKNOWN                       
315.2482  37.9521    2.1  56.3 -148.1   2.8219   5.5 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
73.348600 302.085400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
255.8566 -37.7220    6.6  38.4  108.6  -0.8875  -1.8    9.6	4U 1700-377                   
256.4360 -36.4236  207.2  38.5  110.8   0.0274   0.1    0.0	GX 349+2                      
263.0038 -24.7485   15.5  39.8  131.3   0.3046   0.7    0.3	GX 1+4                        
264.7809 -44.4791   37.1  29.9  100.8   0.0954   0.3    2.4	4U 1735-44                    
268.2686  -1.4597    6.4  53.4  158.5   1.4283   1.8    6.0	SW J1753.5-0127               
270.2704 -25.1177    2.9  34.4  137.7   1.0278   4.0    2.4	GX 5-1                        
270.3427 -25.7244    2.9  34.0  136.9   0.9543   4.0    2.4	GRS 1758-258                  
273.8935 -14.1659   20.9  39.9  154.4   0.1809   0.6   10.2	GX 17+2                       
275.8404 -30.4005    6.5  27.3  135.3   0.3823   1.8    4.8	H1820-303                     
285.2090 -24.9737   15.1  24.8  157.3   0.1446   0.8    9.9	HT1900.1-2455                 
288.8157  10.9969    3.2  56.0 -172.2   2.1301   3.6    3.2	GRS 1915+105                  
263.0908 -33.6953    4.1  34.8  118.9   0.9416   2.8    9.8	GX 354-0                      
257.5691 -50.8736    3.6  33.8   87.4   1.3043   3.3 ------	UNKNOWN                       
280.4002  -1.9960    2.5  46.8  171.8   1.4466   4.5 ------	UNKNOWN                       
346.4022 -19.1351    3.5  41.0  -83.5   2.5272   3.4 ------	UNKNOWN