batgrbproduct Analysis for Trigger=611933
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 Sep 8 10:28:01 EDT 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger611933/batgroup_hand_proc
======================================================================
Trigger: 00611933 Segment: 000
BAT Trigger Time: 431798841.344 [s; MET]
Trigger Stop: 431798842.368 [s; MET]
UTC: 2014-09-07T16:07:08.847220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 48.1471898036904 Dec: 46.5950777481444 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.32
Image Trigger?: NO
Rate S/N Ratio: 8.66025403784439 [ if not an image trigger ]
Image S/N Ratio: 7.32
Flight Position: [ source = BAT ]
RA: 48.1471898036904 Dec: 46.5950777481444 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 48.1291161124197 Dec: 46.598902762319 [deg; J2000]
{ 03h 12m 31.0s , +46d 35' 56.0" }
+/- 1.26157661292084 [arcmin] (estimated 90% radius based on SNR)
+/- 0.325009279759307 [arcmin] (formal 1-sigma fit error)
SNR: 21.825090448075
Angular difference between Flight and Ground position is 0.779676 arcmin
Partial Coding Fraction: 0.65625 [ including projection effects ]
Duration
T90: 79.1679999828339 +/- 31.4224358140569
Measured from: -49.5199999809265
to: 29.6480000019073 [s; relative to TRIGTIME]
T50: 15.3600000143051 +/- 1.24265521049403
Measured from: 3.66400003433228
to: 19.0240000486374 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 17.4679999947548
to: 18.4679999947548 [s; relative to TRIGTIME]
Total Fluence
Measured from: -91.2479999661446
to: 39.8880000114441 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.158580 2.634263 1.843412 0.402831
0.080043 0.081046 0.071538 0.061258 [error]
Peak 0.061207 0.118609 0.093184 0.032312
0.007970 0.008604 0.007911 0.006046 [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 7.34e-07 1.18e-06 1.44e-06 3.44e-06 4.34e-06 6.79e-06 erg/cm2
Error 4.89e-08 4.66e-08 7.26e-08 3.77e-07 1.72e-07 4.29e-07 erg/cm2
Peak flux Power-law 7.65e-01 8.16e-01 6.17e-01 7.60e-01 2.49e+00 2.96e+00 ph/cm2/s
Error 1.13e-01 7.57e-02 6.25e-02 1.56e-01 2.15e-01 2.54e-01 ph/cm2/s
Fluence Cutoff-PL 6.79e-07 1.22e-06 1.47e-06 1.97e-06 4.21e-06 5.34e-06 erg/cm2
Error 6.11e-08 5.50e-08 7.87e-08 7.63e-07 1.96e-07 7.82e-07 erg/cm2
Peak flux Cutoff-PL 6.94e-01 8.58e-01 6.51e-01 4.40e-01 2.44e+00 2.64e+00 ph/cm2/s
Error 1.32e-01 8.92e-02 7.28e-02 2.56e-01 2.19e-01 3.32e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- 2.67e+00 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 1.717 0.069 - - 3.58e-03 1.37e-04 38.240 57
CPL 1.313 0.296 85.9 49.4 5.66e-03 1.93e-03 32.320 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 1.402 0.139 - - 2.04e-02 1.73e-03 65.850 57
CPL 0.877 0.561 110.2 462.4 3.72e-02 2.60e-02 62.910 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: 23.616000 sec.
T50 in the 50-300 keV band: 10.560000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 131.136 -91.248 39.888
T90 79.168 -49.520 29.648
T50 15.360 3.664 19.024
Peak 1.000 17.468 18.468
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
48.1291 46.5989 0.0088 36.8965 -161.2675 3.7980561 21.825 TRIG_00611933
Foreground time interval of the image:
-91.248 12.757 (delta_t = 104.005 [sec])
Background time interval of the image:
-239.344 -91.248 (delta_t = 148.096 [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 -91.248 sec. to 39.888 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71684 ( -0.0688487 0.0693417 )
Norm@50keV : 3.57622E-03 ( -0.000136949 0.000136642 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.24 using 59 PHA bins.
# Reduced chi-squared = 0.6709 for 57 degrees of freedom
# Null hypothesis probability = 9.734031e-01
Photon flux (15-150 keV) in 131.1 sec: 0.477791 ( -0.0190523 0.0191065 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.33544e-06 ( -1.72214e-07 1.72678e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -91.248 sec. to 39.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31321 ( -0.30668 0.286262 )
Epeak [keV] : 85.9456 ( -17.6208 81.2185 )
Norm@50keV : 5.66273E-03 ( -0.0015428 0.00231081 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.32 using 59 PHA bins.
# Reduced chi-squared = 0.5772 for 56 degrees of freedom
# Null hypothesis probability = 9.953254e-01
Photon flux (15-150 keV) in 131.1 sec: 0.465169 ( -0.020812 0.020923 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.20518e-06 ( -1.96532e-07 1.95955e-07 ) ergs/cm2
Band function
Time interval is from -91.248 sec. to 39.888 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.14078 ( -0.412338 0.900593 )
beta : -1.98144 ( 1.98104 0.218641 )
Epeak [keV] : 69.1034 ( -28.551 66.79 )
Norm@50keV : 7.13151E-03 ( -0.0027929 0.0211624 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 31.48 using 59 PHA bins.
# Reduced chi-squared = 0.5724 for 55 degrees of freedom
# Null hypothesis probability = 9.954873e-01
Photon flux (15-150 keV) in 131.1 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] : 13.8821 ( )
R^2/D10^2 : 6.64566E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 165.35 using 59 PHA bins.
# Reduced chi-squared = 2.9008 for 57 degrees of freedom
# Null hypothesis probability = 1.722738e-12
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.549e-07 2.674e-08
25- 50 1.309e-06 6.024e-08
50-150 1.654e-06 1.134e-07
15-150 3.318e-06 1.265e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 136.576 (-22.7037 25.4698)
Norm : 1.96383 (-0.0922914 0.113519)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.36 using 59 PHA bins.
# Reduced chi-squared = 0.5677 for 57 degrees of freedom
# Null hypothesis probability = 9.965026e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.660e-07 4.556e-08
25- 50 1.217e-06 7.460e-08
50-150 2.308e-06 5.650e-07
15-150 4.191e-06 6.666e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.12975 (-1.19074 1.25959)
R1^2/D10^2 : 0.478970 (-0.19228 0.418945)
kT2 [keV] : 23.8167 (-3.4908 5.59578)
R2^2/D10^2 : 6.89588E-03 (-0.00382241 0.00621062)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.98 using 59 PHA bins.
# Reduced chi-squared = 0.7450 for 55 degrees of freedom
# Null hypothesis probability = 9.201657e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.138e-07 8.731e-08
25- 50 1.246e-06 1.221e-07
50-150 2.268e-06 3.599e-07
15-150 4.128e-06 4.615e-07
Peak spectrum fit
Power-law model
Time interval is from 17.468 sec. to 18.468 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40225 ( -0.13901 0.139194 )
Norm@50keV : 2.04100E-02 ( -0.00172908 0.0017269 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.85 using 59 PHA bins.
# Reduced chi-squared = 1.155 for 57 degrees of freedom
# Null hypothesis probability = 1.972377e-01
Photon flux (15-150 keV) in 1 sec: 2.48682 ( -0.214894 0.215201 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.97125e-07 ( -1.82003e-08 1.82962e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 17.468 sec. to 18.468 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.877362 ( -0.598464 0.524158 )
Epeak [keV] : 110.203 ( -35.0136 889.747 )
Norm@50keV : 3.72407E-02 ( -0.0164392 0.035461 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.91 using 59 PHA bins.
# Reduced chi-squared = 1.123 for 56 degrees of freedom
# Null hypothesis probability = 2.450980e-01
Photon flux (15-150 keV) in 1 sec: 2.44363 ( -0.21918 0.21936 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.91356e-07 ( -1.9567e-08 1.9431e-08 ) ergs/cm2
Band function
Time interval is from 17.468 sec. to 18.468 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.880589 ( -0.31999 0.529002 )
beta : -9.37167 ( 9.37164 19.3716 )
Epeak [keV] : 111.557 ( -59.0146 391.378 )
Norm@50keV : 3.69233E-02 ( -0.0116339 0.0134664 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.91 using 59 PHA bins.
# Reduced chi-squared = 1.144 for 55 degrees of freedom
# Null hypothesis probability = 2.166302e-01
Photon flux (15-150 keV) in 1 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] : 15.9104 (-1.68001 1.92765)
R^2/D10^2 : 0.238617 (-0.0783764 0.113642)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 91.04 using 59 PHA bins.
# Reduced chi-squared = 1.597 for 57 degrees of freedom
# Null hypothesis probability = 2.796701e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.251e-08 2.171e-09
25- 50 5.237e-08 5.735e-09
50-150 9.246e-08 1.574e-08
15-150 1.573e-07 1.690e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 10.3328 (-0.868704 0.868661)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.80 using 59 PHA bins.
# Reduced chi-squared = 1.172 for 57 degrees of freedom
# Null hypothesis probability = 1.757678e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.573e-08 2.720e-09
25- 50 4.949e-08 8.585e-09
50-150 1.086e-07 4.166e-08
15-150 1.838e-07 5.421e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.11181 (-1.6219 1.9435)
R1^2/D10^2 : 1.55101 (-0.757098 1.63869)
kT2 [keV] : 30.0984 (-6.78077 13.4603)
R2^2/D10^2 : 2.03020E-02 (-0.0142801 0.0261437)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.45 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 55 degrees of freedom
# Null hypothesis probability = 3.497347e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.151e-08 8.151e-09
25- 50 5.116e-08 1.519e-08
50-150 1.225e-07 5.803e-08
15-150 1.952e-07 7.600e-08
Plot creation:
Mon Sep 8 11:20:23 EDT 2014