GRB050215A: 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 23:04:26 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger106106
======================================================================

  Trigger: 00106106      Segment: 000

  BAT Trigger Time: 130126527.936   [s; MET]
      Trigger Stop: 130126536.128   [s; MET]
               UTC: 2005-02-15T02:15:28.543100    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 348.395966865516   Dec: 49.325242203474  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9
     Image Trigger?:     NO
     Rate S/N Ratio:     10.295630140987  [ if not an image trigger ]
     Image S/N Ratio:    9

  Analysis Position:   [ source = BAT ]
    RA: 348.395966865516   Dec: 49.325242203474  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 348.410939448765   Dec: 49.3224278583739  [deg; J2000]  
        { 23h 13m 38.6s , +49d 19' 20.7" }
         +/- 2.5860429049388 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.75947892123101 [arcmin] (formal 1-sigma fit error)
    SNR: 7.82778288682461
 
  Angular difference between the analysis and refined position is 0.609395 arcmin
 
  Partial Coding Fraction: 0.640625    [ including projection effects ]

  Duration
     T90: 66.4120000004768 +/- 5.30720867029319
        Measured from: 0.420000001788139
                   to: 66.832000002265     [s; relative to TRIGTIME]
     T50: 49.2560000121593 +/- 7.40160522976009
        Measured from: 6.1879999935627
                   to: 55.444000005722     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 5.61999998986721     
                   to: 6.61999998986721     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.324000000953674     
                   to: 71.0679999887943     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.262393   0.328918   0.289514   0.155147
           0.045422   0.046365   0.040164   0.034643 [error]
 Peak      0.012453   0.019569   0.025527   0.011202
           0.005397   0.005695   0.005107   0.004390 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   71.392   -0.324   71.068
T90    66.412    0.420   66.832
T50    49.256    6.188   55.444
Peak    1.000    5.620    6.620
 
 
====== 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      -1.326    -0.261      0.267       -           -               -         9.11e-04     -1.24e-04          1.24e-04      43.010   57
CPL     -1.343    -0.244      0.290     9999.360    -9999.360      -9999.360      9.07e-04     -1.17e-04          1.31e-04      43.060   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      -0.787     -0.440     0.510       -           -               -         4.27e-03     -1.18e-03          1.12e-03      53.680   57
CPL     -0.670      0.670     2.102      691.297    -691.297      -691.297      4.78e-03     -1.58e-03          2.30e-02      53.670   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   7.06e-08  1.44e-07  2.30e-07  8.18e-07  6.39e-07  1.26e-06   erg/cm2
      90%_error_low -1.81e-08 -2.22e-08 -4.08e-08 -2.86e-07 -9.83e-08 -3.18e-07   erg/cm2
      90%_error_hi   1.93e-08  2.16e-08  4.00e-08  3.87e-07  9.94e-08  4.03e-07   erg/cm2
Peak flux       PL   8.92e-02  1.38e-01  1.59e-01  3.55e-01  4.91e-01  7.41e-01   ph/cm2/s
      90%_error_low -4.67e-02 -5.03e-02 -3.93e-02 -1.62e-01 -1.26e-01 -1.94e-01   ph/cm2/s
      90%_error_hi   5.91e-02  4.91e-02  3.90e-02  2.50e-01  1.28e-01  2.23e-01   ph/cm2/s
 
Fluence        CPL   7.06e-08  1.41e-07  2.24e-07  8.41e-07  6.41e-07  1.24e-06   erg/cm2
      90%_error_low -1.82e-08 -1.88e-08    N/A    -4.65e-07 -1.01e-07 -3.72e-07   erg/cm2
      90%_error_hi   1.92e-08  2.51e-08    N/A     4.24e-07  9.63e-08  4.10e-07   erg/cm2
Peak flux      CPL   8.60e-02  1.38e-01  1.62e-01  3.15e-01  4.88e-01  7.01e-01   ph/cm2/s
      90%_error_low -6.36e-02 -5.22e-02 -4.14e-02 -3.15e-01 -1.30e-01 -2.90e-01   ph/cm2/s
      90%_error_hi   5.03e-02  5.18e-02  5.04e-02  1.66e-01  1.29e-01  2.40e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  348.4109    49.3224   0.0245    24.3862   -68.0497         0.6626284      7.828 TRIG_00106106                 
 
Foreground time interval of the image:
 -0.324  51.165 (delta_t =  51.489 [sec])
Background time interval of the image:
-119.936  -0.324 (delta_t = 119.612 [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   -0.324 sec. to   71.068 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.3262     ( -0.261294   0.266772 )
Norm@50keV  : 9.10793E-04    ( -0.000123989   0.000123682 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.01 using 59 PHA bins.
# Reduced chi-squared =         0.7546 for     57 degrees of freedom 
# Null hypothesis probability =   9.149243e-01
 
Photon flux (15-150 keV)    in 71.39 sec: 0.109203 ( -0.0152454  0.015288 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.38598e-07 ( -9.83319e-08  9.94377e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.324 sec. to   71.068 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.3237     ( -0.24527   0.288317 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 9.14342E-04    ( -0.000124702   0.00012354 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.04 using 59 PHA bins.
# Reduced chi-squared =         0.7686 for     56 degrees of freedom 
# Null hypothesis probability =   8.979407e-01
 
Photon flux (15-150 keV)    in 71.39 sec: 0.109195 ( -0.0152683  0.015273 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.41323e-07 ( -1.01344e-07  9.62708e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    5.620 sec. to    6.620 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.787459     ( -0.439857   0.510085 )
Norm@50keV  : 4.26827E-03    ( -0.00118319   0.00112241 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.68 using 59 PHA bins.
# Reduced chi-squared =         0.9418 for     57 degrees of freedom 
# Null hypothesis probability =   6.002816e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.490789 ( -0.126387  0.128212 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.01487e-08 ( -1.26324e-08  1.27136e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    5.620 sec. to    6.620 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.669957     ( 0.669634   2.10119 )
Epeak [keV] : 691.297      ( -690.509 -690.509 )
Norm@50keV  : 4.77755E-03    ( -0.00157757   0.0230216 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.67 using 59 PHA bins.
# Reduced chi-squared =         0.9583 for     56 degrees of freedom 
# Null hypothesis probability =   5.637145e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.488360 ( -0.130059  0.129221 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.9916e-08 ( -1.32697e-08  1.28971e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 66.412 sec.
Hardness ratio (energy fluence ratio) = 1.59529115181

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

S(15-50 keV)  = 2.1479041e-07
S(50-150 keV) = 4.238066e-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 = 1.694554930874460E-01, IMY = 4.204669412646664E-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:
-119.936000 -0.324000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.0336  40.9913    7.2  49.5  -41.5   0.6736   1.6    4.2	Cyg X-3                       
326.0201  38.2619  114.1  43.2  -59.0   0.0391   0.1    8.0	Cyg X-2                       
 53.7740  53.1575    1.0  16.8  143.3   1.0986  11.2 ------	UNKNOWN                       
 45.7450  39.9551    2.2  24.7  177.9   0.5070   5.2 ------	UNKNOWN                       
 33.4168   5.2275    2.2  56.8 -153.3   2.7048   5.3 ------	UNKNOWN                       

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

Time interval of the image:
-0.324000 51.164600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.0382  40.9139    5.3  49.6  -41.6  -0.5848  -2.2    4.0	Cyg X-3                       
326.3313  38.2240    7.0  43.1  -59.3   0.4074   1.7    9.5	Cyg X-2                       
257.7175  73.4689    2.0  40.5   15.0   0.6486   5.8 ------	UNKNOWN                       
 38.0753  29.5359    2.8  33.1 -163.6   0.3189   4.1 ------	UNKNOWN                       
348.4108  49.3224    1.5  24.4  -68.0   0.6626   7.8 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
95.964600 302.123600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5886  35.1992    0.3  38.0  -24.4   6.9257  35.6    0.2	Cyg X-1                       
308.0407  40.9325    2.0  29.3  -22.6   0.8990   5.7    3.4	Cyg X-3                       
326.0458  38.4294    7.7  19.4  -47.3   0.2284   1.5    8.8	Cyg X-2                       
 42.4158  70.3633    3.1  32.5   99.0   1.0659   3.7 ------	UNKNOWN                       
 32.2905  68.6278    2.8  28.6  100.5   1.0612   4.2 ------	UNKNOWN                       
294.9228  59.8042    3.2  31.7   18.3   0.5875   3.6 ------	UNKNOWN                       
327.3993  15.5517    2.9  37.9  -77.1   1.6251   4.0 ------	UNKNOWN