batgrbproduct Analysis for Trigger=649706
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Mon Jul 20 20:49:16 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger649706/batgroup_hand_proc
======================================================================
Trigger: 00649706 Segment: 000
BAT Trigger Time: 459093714 [s; MET]
Trigger Stop: 459093804 [s; MET]
UTC: 2015-07-20T14:01:39.120700 [includes UTCF correction]
Where From?: Command line
BAT
RA: 119.582501208641 Dec: -28.3009627793679 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.55
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.55
Flight Position: [ source = EXTERNAL ]
RA: 119.5954 Dec: -28.2733 [deg; J2000]
Partial Coding Fraction: 1.015625 [ including projection effects ]
Angular difference between Flight and Ground position is 0.000000 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 150.783999979496 +/- 11.0126501692206
Measured from: 0.272000133991241
to: 151.056000113487 [s; relative to TRIGTIME]
T50: 93.6320000290871 +/- 52.5060325778559
Measured from: 37.9040001034737
to: 131.536000132561 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 54.3960000276566
to: 55.3960000276566 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.10399997234344
to: 156.367999970913 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.647961 0.490326 0.136814 0.054783
0.062788 0.064081 0.054913 0.047163 [error]
Peak 0.016853 0.014547 0.001319 0.002922
0.004912 0.005093 0.004481 0.003625 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== 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 Power-law 1.98e-07 1.89e-07 1.26e-07 1.31e-07 5.67e-07 6.45e-07 erg/cm2
Error 3.17e-08 3.17e-08 4.37e-08 8.43e-08 1.02e-07 1.51e-07 erg/cm2
Peak flux Power-law 1.55e-01 8.84e-02 3.18e-02 1.50e-02 2.83e-01 2.90e-01 ph/cm2/s
Error 6.94e-02 4.22e-02 3.23e-02 2.74e-02 1.14e-01 1.20e-01 ph/cm2/s
Fluence Cutoff-PL 1.94e-07 2.09e-07 8.05e-08 8.61e-09 4.91e-07 4.92e-07 erg/cm2
Error 3.35e-08 4.32e-08 7.01e-08 1.00e-07 1.34e-07 1.83e-07 erg/cm2
Peak flux Cutoff-PL 1.54e-01 1.05e-01 1.38e-02 1.73e-04 2.74e-01 2.74e-01 ph/cm2/s
Error 7.54e-02 8.25e-02 3.01e-02 2.31e-02 1.11e-01 1.13e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.54e-01 1.06e-01 1.89e-02 -------- 2.75e-01 2.76e-01 ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.584 0.322 - - 3.43e-04 8.72e-05 63.820 57
CPL 1.233 2.154 17.8 13.2 2.83e-03 4.62e-01 62.530 56
The chi2 of BB fit is Chi-Squared Chi-Squared which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.476 0.925 - - 1.46e-03 1.01e-03 45.600 57
CPL 0.731 0.000 22.4 0.0 2.35e-02 0.00e+00 44.900 56
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the 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 PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 161.472 -5.104 156.368
T90 150.784 0.272 151.056
T50 93.632 37.904 131.536
Peak 1.000 54.396 55.396
Image
Pre-slew 15.0-50.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
119.5954 -28.2733 0.0203 16.9417 -168.6056 0.6217485 9.519 TRIG_00649706
Foreground time interval of the image:
0.000 90.000 (delta_t = 90.000 [sec])
Background time interval of the image:
-30.000 -5.104 (delta_t = 24.896 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 5) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 6) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of 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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -5.104 sec. to 156.368 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.58400 ( -0.30143 0.343217 )
Norm@50keV : 3.42835E-04 ( -8.67454e-05 8.75872e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.82 using 59 PHA bins.
# Reduced chi-squared = 1.120 for 57 degrees of freedom
# Null hypothesis probability = 2.492030e-01
Photon flux (15-150 keV) in 161.5 sec: 7.09694E-02 ( -0.00955651 0.00956353 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.67127e-07 ( -9.92904e-08 1.05105e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.104 sec. to 156.368 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23315 ( -3.53691 0.770714 )
Epeak [keV] : 17.7983 ( -16.4009 10.0129 )
Norm@50keV : 2.83197E-03 ( -0.00293903 0.920313 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.53 using 59 PHA bins.
# Reduced chi-squared = 1.117 for 56 degrees of freedom
# Null hypothesis probability = 2.555236e-01
Photon flux (15-150 keV) in 161.5 sec: 6.83608E-02 ( -0.0099674 0.0102429 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.91373e-07 ( -9.64623e-08 1.71813e-07 ) ergs/cm2
Band function
Time interval is from -5.104 sec. to 156.368 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.229874 ( 1.06839 1.06839 )
beta : -3.36664 ( 3.19027 0.7311 )
Epeak [keV] : 22.1162 ( -19.1956 8.88567 )
Norm@50keV : 1.50039E-02 ( -0.0123631 105.581 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.38 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 55 degrees of freedom
# Null hypothesis probability = 2.580747e-01
Photon flux (15-150 keV) in 161.5 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.49026 (-0.841667 0.954311)
R^2/D10^2 : 0.185015 (-0.0815721 0.150284)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.44 using 59 PHA bins.
# Reduced chi-squared = 1.131 for 57 degrees of freedom
# Null hypothesis probability = 2.325593e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.856e-07 4.187e-08
25- 50 2.186e-07 5.386e-08
50-150 2.734e-08 1.481e-08
15-150 4.316e-07 8.640e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 26.4796 (-7.35082 11.3697)
Norm : 0.635769 (-0.17445 0.263221)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.53 using 59 PHA bins.
# Reduced chi-squared = 1.097 for 57 degrees of freedom
# Null hypothesis probability = 2.863171e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.949e-07 3.674e-08
25- 50 2.071e-07 5.202e-08
50-150 9.569e-08 4.907e-08
15-150 4.978e-07 1.161e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.95523 (-5.5351 1.0816)
R1^2/D10^2 : 0.249429 (-0.122211 1.11099)
kT2 [keV] : 30.9098 (-30.9109 -30.9111)
R2^2/D10^2 : 1.52101E-04 (-0.000151427 0.0691641)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.84 using 59 PHA bins.
# Reduced chi-squared = 1.106 for 55 degrees of freedom
# Null hypothesis probability = 2.737772e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.914e-07 6.187e-08
25- 50 2.067e-07 7.712e-08
50-150 1.664e-07 9.401e-08
15-150 5.645e-07 2.302e-07
Peak spectrum fit
Power-law model
Time interval is from 54.396 sec. to 55.396 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.47583 ( -0.753239 1.09693 )
Norm@50keV : 1.46394E-03 ( -0.00097427 0.00105086 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.60 using 59 PHA bins.
# Reduced chi-squared = 0.8000 for 57 degrees of freedom
# Null hypothesis probability = 8.610979e-01
Photon flux (15-150 keV) in 1 sec: 0.283385 ( -0.113571 0.11467 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.45474e-08 ( -7.19218e-09 8.63895e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 54.396 sec. to 55.396 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.731239 ( )
Epeak [keV] : 22.3842 ( )
Norm@50keV : 2.34845E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.90 using 59 PHA bins.
# Reduced chi-squared = 0.8019 for 56 degrees of freedom
# Null hypothesis probability = 8.560727e-01
Photon flux (15-150 keV) in 1 sec: 0.273828 ( -0.107801 0.113262 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18108e-08 ( -5.72095e-09 9.9941e-09 ) ergs/cm2
Band function
Time interval is from 54.396 sec. to 55.396 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.94258 ( -12.4753 -4.94258 )
beta : -3.22701 ( 3.22701 1.26976 )
Epeak [keV] : 22.5545 ( -22.5545 8.19221 )
Norm@50keV : 737.379 ( -279.387 8.21674e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.35 using 59 PHA bins.
# Reduced chi-squared = 0.8064 for 55 degrees of freedom
# Null hypothesis probability = 8.472519e-01
Photon flux (15-150 keV) in 1 sec: 0.274563 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22532e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.47456 (-2.30303 3.4298)
R^2/D10^2 : 0.776407 (-0.776367 4.28673)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.97 using 59 PHA bins.
# Reduced chi-squared = 0.7890 for 57 degrees of freedom
# Null hypothesis probability = 8.756702e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.786e-09 2.971e-09
25- 50 5.608e-09 3.811e-09
50-150 6.948e-10 6.125e-10
15-150 1.109e-08 7.095e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 28.6296 (-17.2394 68.7565)
Norm : 2.41314 (-1.35131 4.17684)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.01 using 59 PHA bins.
# Reduced chi-squared = 0.7897 for 57 degrees of freedom
# Null hypothesis probability = 8.746927e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.791e-09 2.994e-09
25- 50 5.333e-09 3.610e-09
50-150 2.744e-09 2.452e-09
15-150 1.287e-08 8.435e-09
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 15.1192 ( )
R1^2/D10^2 : 8.12877E-03 (-0.00655832 -0.00655832)
kT2 [keV] : 5.51667 (-5.58648 4.0843)
R2^2/D10^2 : 1.27671 (-1.23141 -1.23141)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.76 using 59 PHA bins.
#Fit statistic : Chi-Squared = 44.70 using 59 PHA bins.
# Reduced chi-squared = 0.8138 for 55 degrees of freedom
# Reduced chi-squared = 0.8127 for 55 degrees of freedom
# Null hypothesis probability = 8.364094e-01
# Null hypothesis probability = 8.381039e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.899e-09 3.517e-09
25- 50 5.440e-09 5.235e-09
50-150 1.800e-09 1.252e-09
15-150 1.214e-08 9.615e-09
Plot creation:
Mon Jul 20 20:51:24 EDT 2015