batgrbproduct Analysis for Trigger=607945
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): Sat Aug 2 08:20:26 EDT 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger607945/GCN5_download_cron
======================================================================
Trigger: 00607945 Segment: 000
BAT Trigger Time: 428587384 [s; MET]
Trigger Stop: 428587448 [s; MET]
UTC: 2014-08-01T12:02:51.660500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 124.350137358482 Dec: -27.3324846783609 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.77
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.77
Flight Position: [ source = BAT ]
RA: 124.350137358482 Dec: -27.3324846783609 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 124.383701794826 Dec: -27.2631820606569 [deg; J2000]
{ 08h 17m 32.1s , -27d 15' 47.5" }
+/- 4.56535549462727 [arcmin] (estimated 90% radius based on SNR)
+/- 3.28615937887759 [arcmin] (formal 1-sigma fit error)
SNR: 3.47545610255822
Angular difference between Flight and Ground position is 4.526909 arcmin
Partial Coding Fraction: 0.7109375 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.141656 0.234721 -0.063866 0.015883
0.046246 0.047628 0.041672 0.037267 [error]
Peak 0.141656 0.234721 -0.063866 0.015883
0.046246 0.047628 0.041672 0.037267 [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 5.08e-08 5.64e-08 4.47e-08 5.86e-08 1.74e-07 2.13e-07 erg/cm2
Error 2.08e-08 2.26e-08 3.07e-08 8.39e-08 7.80e-08 1.26e-07 erg/cm2
Peak flux Power-law 2.66e-02 1.65e-02 6.55e-03 3.51e-03 5.14e-02 5.31e-02 ph/cm2/s
Error 1.11e-02 6.43e-03 4.34e-03 4.65e-03 1.87e-02 1.95e-02 ph/cm2/s
Fluence Cutoff-PL 3.18e-08 1.06e-07 1.83e-08 1.63e-11 1.56e-07 1.56e-07 erg/cm2
Error 2.51e-08 3.85e-08 2.50e-08 1.49e-09 5.36e-08 5.36e-08 erg/cm2
Peak flux Cutoff-PL 1.54e-02 3.07e-02 3.18e-03 1.54e-06 4.93e-02 4.93e-02 ph/cm2/s
Error 1.29e-02 1.08e-02 4.02e-03 1.29e-04 1.78e-02 1.78e-02 ph/cm2/s
Fluence Band 4.32e-08 9.47e-08 7.41e-08 7.00e-08 2.42e-07 2.85e-07 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- -------- 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 2.318 0.660 - - 2.92e-04 1.52e-04 72.460 57
CPL -6.414 0.000 34.9 6.4 6.77e+01 0.00e+00 64.500 56
The chi2 of BB fit is 65.72 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 2.318 0.660 - - 2.92e-04 1.52e-04 72.460 57
CPL -6.414 0.000 34.9 6.4 6.77e+01 0.00e+00 64.500 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
124.3837 -27.2632 0.0554 32.8 -152.2 0.3282 3.5 TRIG_00607945
------------------------------------------
Foreground time interval of the image:
0.000 36.560 (delta_t = 36.560 [sec])
38.000 64.000 (delta_t = 26.000 [sec])
Background time interval of the image:
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
Multiple GTIs in the spectrum
tstart tstop
0.000000 36.560000
38.000000 64.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.31810 ( -0.584687 0.735647 )
Norm@50keV : 2.91571E-04 ( -0.000150882 0.000153731 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.46 using 59 PHA bins.
# Reduced chi-squared = 1.271 for 57 degrees of freedom
# Null hypothesis probability = 8.138940e-02
Photon flux (15-150 keV) in 62.56 sec: 5.14355E-02 ( -0.0185846 0.0187224 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.7353e-07 ( -7.39716e-08 8.21131e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 36.560000
38.000000 64.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.41372 ( )
Epeak [keV] : 34.8674 ( -6.96096 5.92845 )
Norm@50keV : 67.7020 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.50 using 59 PHA bins.
# Reduced chi-squared = 1.152 for 56 degrees of freedom
# Null hypothesis probability = 2.038559e-01
Photon flux (15-150 keV) in 62.56 sec: 4.92761E-02 ( -0.0173854 0.0183038 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.56305e-07 ( -5.19079e-08 5.53356e-08 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 36.560000
38.000000 64.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.92701 ( -4.72131 -4.92701 )
beta : -9.36763 ( 9.36763 19.3237 )
Epeak [keV] : 35.1072 ( -6.45706 5.90555 )
Norm@50keV : 8.08181 ( -2.48456 26.1427 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.58 using 59 PHA bins.
# Reduced chi-squared = 1.174 for 55 degrees of freedom
# Null hypothesis probability = 1.766852e-01
Photon flux (15-150 keV) in 62.56 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.42026e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.50245 (-1.87505 2.29412)
R^2/D10^2 : 5.41172E-02 (-0.0342346 0.0892377)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.72 using 59 PHA bins.
# Reduced chi-squared = 1.153 for 57 degrees of freedom
# Null hypothesis probability = 2.003635e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.613e-08 2.834e-08
25- 50 8.950e-08 5.609e-08
50-150 2.861e-08 2.162e-08
15-150 1.642e-07 1.031e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 34.9549 (-16.9596 44.189)
Norm : 0.389105 (-0.174629 0.307962)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.86 using 59 PHA bins.
# Reduced chi-squared = 1.226 for 57 degrees of freedom
# Null hypothesis probability = 1.178623e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.315e-08 3.297e-08
25- 50 6.574e-08 4.145e-08
50-150 4.359e-08 3.854e-08
15-150 1.625e-07 1.097e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.135744 (0.822496 -0.135744)
R1^2/D10^2 : 3.53013E+14 (-3.53018e+14 -3.53018e+14)
kT2 [keV] : 8.50171 (-1.87825 2.29094)
R2^2/D10^2 : 5.41356E-02 (-0.0342389 0.0892333)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.72 using 59 PHA bins.
# Reduced chi-squared = 1.195 for 55 degrees of freedom
# Null hypothesis probability = 1.526385e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from 38.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.31810 ( -0.584687 0.735647 )
Norm@50keV : 2.91571E-04 ( -0.000150882 0.000153731 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.46 using 59 PHA bins.
# Reduced chi-squared = 1.271 for 57 degrees of freedom
# Null hypothesis probability = 8.138940e-02
Photon flux (15-150 keV) in 62.56 sec: 5.14355E-02 ( -0.0185846 0.0187224 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.7353e-07 ( -7.39716e-08 8.21131e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 38.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.41372 ( )
Epeak [keV] : 34.8674 ( -6.96096 5.92845 )
Norm@50keV : 67.7020 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.50 using 59 PHA bins.
# Reduced chi-squared = 1.152 for 56 degrees of freedom
# Null hypothesis probability = 2.038559e-01
Photon flux (15-150 keV) in 62.56 sec: 4.92761E-02 ( -0.0173854 0.0183038 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.56305e-07 ( -5.19079e-08 5.53356e-08 ) ergs/cm2
Band function
Time interval is from 38.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.92701 ( -4.72131 -4.92701 )
beta : -9.36763 ( 9.36763 19.3237 )
Epeak [keV] : 35.1072 ( -6.45706 5.90555 )
Norm@50keV : 8.08181 ( -2.48456 26.1427 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.58 using 59 PHA bins.
# Reduced chi-squared = 1.174 for 55 degrees of freedom
# Null hypothesis probability = 1.766852e-01
Photon flux (15-150 keV) in 62.56 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.42026e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.50245 (-1.87505 2.29412)
R^2/D10^2 : 5.41172E-02 (-0.0342346 0.0892377)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.72 using 59 PHA bins.
# Reduced chi-squared = 1.153 for 57 degrees of freedom
# Null hypothesis probability = 2.003635e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.613e-08 2.773e-08
25- 50 8.950e-08 5.634e-08
50-150 2.861e-08 2.206e-08
15-150 1.642e-07 1.029e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 34.9549 (-16.9596 44.189)
Norm : 0.389105 (-0.174629 0.307962)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.86 using 59 PHA bins.
# Reduced chi-squared = 1.226 for 57 degrees of freedom
# Null hypothesis probability = 1.178623e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.315e-08 3.269e-08
25- 50 6.574e-08 4.151e-08
50-150 4.359e-08 3.948e-08
15-150 1.625e-07 1.051e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.135744 (0.822496 -0.135744)
R1^2/D10^2 : 3.53013E+14 (-3.53018e+14 -3.53018e+14)
kT2 [keV] : 8.50171 (-1.87825 2.29094)
R2^2/D10^2 : 5.41356E-02 (-0.0342389 0.0892333)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.72 using 59 PHA bins.
# Reduced chi-squared = 1.195 for 55 degrees of freedom
# Null hypothesis probability = 1.526385e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Sat Aug 2 08:27:37 EDT 2014