GRB080212: 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 04:26:04 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger303105
======================================================================

  Trigger: 00303105      Segment: 000

  BAT Trigger Time: 224530476.032   [s; MET]
      Trigger Stop: 224530480.128   [s; MET]
               UTC: 2008-02-12T17:34:33.462080    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 231.106540249564   Dec: -22.7519170931094  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.18
     Image Trigger?:     NO
     Rate S/N Ratio:     10.5356537528527  [ if not an image trigger ]
     Image S/N Ratio:    7.18

  Analysis Position:   [ source = BAT ]
    RA: 231.106540249564   Dec: -22.7519170931094  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 231.145119911576   Dec: -22.7376214715578  [deg; J2000]  
        { 15h 24m 34.8s , -22d 44' 15.4" }
         +/- 1.48508149503431 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.568481594872744 [arcmin] (formal 1-sigma fit error)
    SNR: 17.2886398661311
 
  Angular difference between the analysis and refined position is 2.300646 arcmin
 
  Partial Coding Fraction: 0.3554688    [ including projection effects ]

  Duration
     T90: 126.312000006437 +/- 13.1998475874045
        Measured from: -54.7680000066757
                   to: 71.5439999997616     [s; relative to TRIGTIME]
     T50: 50.3360000252724 +/- 15.6678316505333
        Measured from: -16.5960000157356
                   to: 33.7400000095367     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 3.77599999308586     
                   to: 4.77599999308586     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -62.2319999933243     
                   to: 78.1119999885559     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.066767   2.049645   1.472653   0.307487
           0.119039   0.111430   0.098250   0.084172 [error]
 Peak      0.020164   0.049205   0.053276   0.013124
           0.010655   0.010211   0.009619   0.007820 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  140.344  -62.232   78.112
T90   126.312  -54.768   71.544
T50    50.336  -16.596   33.740
Peak    1.000    3.776    4.776
 
 
====== 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      -1.513    -0.111      0.111       -           -               -         2.48e-03     -1.64e-04          1.63e-04      78.630   57
CPL     -0.230    -0.556      0.640       69.911      -9.096        17.152      1.06e-02     -4.87e-03          1.10e-02      60.460   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      -1.145     -0.367     0.392       -           -               -         9.65e-03     -2.14e-03          2.11e-03      54.430   57
CPL     -0.570      0.570     2.155      146.224    -146.224      -146.224      1.71e-02     -9.34e-03          1.10e-01      54.050   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   4.50e-07  8.19e-07  1.15e-06  3.37e-06  3.29e-06  5.79e-06   erg/cm2
      90%_error_low -5.08e-08 -5.80e-08 -9.41e-08 -5.55e-07 -2.31e-07 -6.31e-07   erg/cm2
      90%_error_hi   5.26e-08  5.79e-08  9.39e-08  6.24e-07  2.33e-07  6.84e-07   erg/cm2
Peak flux       PL   2.83e-01  3.52e-01  3.18e-01  5.00e-01  1.13e+00  1.45e+00   ph/cm2/s
      90%_error_low -1.18e-01 -1.00e-01 -7.19e-02 -2.05e-01 -2.61e-01 -3.12e-01   ph/cm2/s
      90%_error_hi   1.40e-01  9.80e-02  7.10e-02  2.80e-01  2.65e-01  3.16e-01   ph/cm2/s
 
Fluence        CPL   3.52e-07  9.09e-07  1.23e-06  8.15e-07  3.01e-06  3.30e-06   erg/cm2
      90%_error_low -6.19e-08 -7.19e-08 -1.11e-07 -3.31e-07 -2.57e-07 -4.11e-07   erg/cm2
      90%_error_hi   6.42e-08  7.35e-08  1.12e-07  5.68e-07  2.60e-07  5.97e-07   erg/cm2
Peak flux      CPL   2.41e-01  3.60e-01  3.41e-01  3.07e-01  1.10e+00  1.25e+00   ph/cm2/s
      90%_error_low -1.47e-01 -1.07e-01 -8.92e-02 -3.07e-01 -2.71e-01 -3.79e-01   ph/cm2/s
      90%_error_hi   1.71e-01  1.09e-01  9.85e-02  2.68e-01  2.76e-01  3.80e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  231.1451   -22.7376   0.0111    41.5334    15.3097         4.1734030     17.289 TRIG_00303105                 
 
Foreground time interval of the image:
-62.232  36.869 (delta_t =  99.101 [sec])
Background time interval of the image:
-239.032 -62.232 (delta_t = 176.800 [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  -62.232 sec. to   78.112 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.51318     ( -0.110903   0.110629 )
Norm@50keV  : 2.47827E-03    ( -0.000163566   0.000163405 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          78.63 using 59 PHA bins.
# Reduced chi-squared =          1.379 for     57 degrees of freedom 
# Null hypothesis probability =   3.037999e-02
 
Photon flux (15-150 keV)    in 140.3 sec: 0.310503 ( -0.021311  0.021376 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.2919e-06 ( -2.31293e-07  2.32519e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -62.232 sec. to   78.112 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.230017     ( -0.556345   0.639781 )
Epeak [keV] : 69.9110      ( -9.09548 17.1524 )
Norm@50keV  : 1.05884E-02    ( -0.00487054   0.0109526 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.46 using 59 PHA bins.
# Reduced chi-squared =          1.080 for     56 degrees of freedom 
# Null hypothesis probability =   3.180118e-01
 
Photon flux (15-150 keV)    in 140.3 sec: 0.290636 ( -0.022709  0.022815 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.01355e-06 ( -2.57493e-07  2.60296e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    3.776 sec. to    4.776 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.14498     ( -0.366774   0.39165 )
Norm@50keV  : 9.65464E-03    ( -0.00213598   0.00210728 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.43 using 59 PHA bins.
# Reduced chi-squared =         0.9549 for     57 degrees of freedom 
# Null hypothesis probability =   5.720802e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.12526 ( -0.26075  0.26483 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.95497e-08 ( -2.18409e-08  2.19122e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    3.776 sec. to    4.776 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.570443     ( 0.570443   2.15537 )
Epeak [keV] : 146.224      ( -146.224 -146.224 )
Norm@50keV  : 1.71483E-02    ( -0.00933878   0.109641 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.05 using 59 PHA bins.
# Reduced chi-squared =         0.9652 for     56 degrees of freedom 
# Null hypothesis probability =   5.489683e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.09560 ( -0.271105  0.27641 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.74967e-08 ( -2.31948e-08  2.27131e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 126.312 sec.
Hardness ratio (energy fluence ratio) = 1.34911852738

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

S(15-50 keV)  = 1.2610885e-06
S(50-150 keV) = 1.7525029e-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 = 8.543328397660819E-01, IMY = -2.338748405639205E-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:
-239.032000 -62.232000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9786 -15.6401    0.3  30.1   -1.1   9.0067  45.1    0.1	Sco X-1                       
254.3264  35.4812    6.2  21.8  173.4   0.3212   1.9   10.5	Her X-1                       
255.8620 -37.8218    6.5  51.8  -17.9  -0.7492  -1.8    6.1	4U 1700-377                   
256.6221 -36.3214   10.7  50.4  -18.9   0.4391   1.1   10.9	GX 349+2                      
262.9886 -24.7345   51.0  40.2  -29.9   0.0545   0.2    1.3	GX 1+4                        
268.2640  -1.5122    3.4  22.8  -62.3   0.6472   3.3    7.2	SW J1753.5-0127               
270.0831 -25.2056    0.0  43.1  -38.6  -0.1707  -0.5   13.3	GX 5-1                        
270.1280 -25.8716    5.4  43.7  -38.2  -0.6802  -2.1   12.2	GRS 1758-258                  
273.8705 -13.9863    3.0  35.7  -53.0   1.0325   3.9    8.4	GX 17+2                       
275.9572 -30.2928    6.5  50.1  -41.3   1.2232   1.8    4.8	H1820-303                     
288.9773  10.9987   14.5  36.9 -103.3  -0.3608  -0.8   11.0	GRS 1915+105                  
299.5656  35.1924    1.5  48.3 -138.5   4.4367   7.9    1.3	Cyg X-1                       
262.9866 -33.8841    8.1  49.0  -26.2   0.5792   1.4    3.0	GX 354-0                      
279.7263  67.6563    4.0  56.9  179.2   3.0565   2.9 ------	UNKNOWN                       
281.2548  46.2409    2.4  41.0 -161.5   1.2304   4.8 ------	UNKNOWN                       
267.2806 -26.5990    1.7  43.3  -34.4   2.0094   6.6 ------	UNKNOWN                       
282.8961 -20.4108    2.4  46.2  -56.2   3.4292   4.8 ------	UNKNOWN                       

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

Time interval of the image:
-62.232000 36.868610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
245.0996 -15.6536   10.4  30.1   -1.4   0.1650   1.1    7.0	Sco X-1                       
254.2811  35.3444   10.4  21.7  173.3  -0.1483  -1.1    8.6	Her X-1                       
255.9613 -37.8584   38.8  51.9  -18.0   0.1013   0.3    1.5	4U 1700-377                   
256.3724 -36.2719    0.0  50.3  -18.6  -0.4730  -1.6    9.6	GX 349+2                      
263.0198 -24.8440    3.1  40.3  -29.9   0.7524   3.7    5.9	GX 1+4                        
268.2265  -1.4104    3.9  22.7  -62.4  -0.4275  -2.9    8.9	SW J1753.5-0127               
270.2851 -25.0774  491.3  43.1  -38.9   0.0059   0.0    0.1	GX 5-1                        
270.3010 -25.7441  392.1  43.7  -38.5   0.0078   0.0    0.1	GRS 1758-258                  
273.8916 -13.9261    7.2  35.6  -53.1  -0.3375  -1.6    9.4	GX 17+2                       
276.0405 -30.4160    6.0  50.2  -41.3   0.9975   1.9    6.7	H1820-303                     
288.7070  10.8525    7.0  36.6 -103.0   0.4851   1.6    7.8	GRS 1915+105                  
299.4255  35.2034    6.2  48.2 -138.5  -0.7542  -1.9    8.1	Cyg X-1                       
262.8660 -33.8850    7.4  49.0  -26.1  -0.5103  -1.6    6.8	GX 354-0                      
232.1741  34.3856    2.3  26.9  130.0   0.8127   5.0 ------	UNKNOWN                       
244.4008  46.9397    2.3  33.6  158.2   0.8676   5.0 ------	UNKNOWN                       
231.1451 -22.7376    0.7  41.5   15.3   4.1732  17.3 ------	UNKNOWN                       
239.9667   6.3782    2.8  13.4   44.1   0.5512   4.1 ------	UNKNOWN                       
285.6902  34.4458    2.5  37.3 -143.0   0.8523   4.6 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
95.668600 516.368600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
186.9099 -62.6776    6.7  49.7   10.6   1.6284   1.7    8.9	GX 301-2                      
244.9723 -15.6389    0.2  14.9 -130.4  23.2652  73.9    0.4	Sco X-1                       
255.9384 -37.8320    3.1  26.1  -63.3   1.5961   3.7    2.4	4U 1700-377                   
256.4876 -36.5546   10.4  25.9  -66.3   0.4801   1.1    8.3	GX 349+2                      
262.9970 -24.6141   29.3  29.2  -94.2   0.1907   0.4    7.9	GX 1+4                        
264.5835 -44.3533    8.8  34.9  -57.9  -0.6723  -1.3    9.0	4U 1735-44                    
268.3691  -1.4459   27.4  42.0 -129.4   0.3165   0.4    0.4	SW J1753.5-0127               
270.1891 -25.1050    6.4  35.7  -92.5   1.4098   1.8    5.4	GX 5-1                        
270.1370 -25.7679   33.3  35.6  -91.3   0.2692   0.3    9.1	GRS 1758-258                  
273.9005 -13.9888    8.8  41.4 -108.8   1.6493   1.3    6.8	GX 17+2                       
275.9101 -30.3700  225.6  40.5  -83.6   0.0693   0.1    0.8	H1820-303                     
263.0090 -33.8311    2.5  30.0  -75.5   2.2325   4.6    1.0	GX 354-0                      
187.1186 -50.8293    4.7  44.0   24.9   2.0944   2.4 ------	UNKNOWN                       
176.4634 -64.3310    2.1  54.6   11.5  10.0141   5.4 ------	UNKNOWN                       
199.9153 -55.2276    2.0  39.8   13.2   3.0841   5.9 ------	UNKNOWN                       
184.8675 -74.8003    3.3  57.3   -1.2   7.3856   3.5 ------	UNKNOWN                       
264.0291 -24.7910    2.2  30.1  -93.7   2.7321   5.2 ------	UNKNOWN                       
267.3201 -26.6523    2.7  33.0  -89.9   2.6718   4.4 ------	UNKNOWN                       
279.7843 -52.0234    3.0  47.2  -53.3   5.6823   3.8 ------	UNKNOWN