batgrbproduct Analysis for Trigger=646721
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 Jun 27 10:31:14 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger646721/GCN5_download_cron
======================================================================
Trigger: 00646721 Segment: 000
BAT Trigger Time: 457015792.456 [s; MET]
Trigger Stop: 457015792.52 [s; MET]
UTC: 2015-06-26T12:49:38.685120 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 306.006321847485 Dec: 33.8682418815014 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 19.44
Image Trigger?: NO
Rate S/N Ratio: 7.34846922834953 [ if not an image trigger ]
Image S/N Ratio: 19.44
Flight Position: [ source = BAT ]
RA: 306.006321847485 Dec: 33.8682418815014 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 306.019050368457 Dec: 33.8648969006466 [deg; J2000]
{ 20h 24m 04.6s , +33d 51' 53.6" }
+/- 0.504176438989259 [arcmin] (estimated 90% radius based on SNR)
+/- 0.13432910607083 [arcmin] (formal 1-sigma fit error)
SNR: 80.9096749472726
Angular difference between Flight and Ground position is 0.665140 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 231.29599994421 +/- 0.914400340071104
Measured from: 0.0840001702308655
to: 231.380000114441 [s; relative to TRIGTIME]
T50: 200.071999907494 +/- 0.46544600494634
Measured from: 6.52400016784668
to: 206.59600007534 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5.22000002861023
to: 6.22000002861023 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.41599994897842
to: 236.912000000477 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 48.274832 46.067408 14.243332 1.065664
0.099294 0.097828 0.063862 0.039655 [error]
Peak 0.950731 0.855126 0.225212 0.011852
0.013381 0.012728 0.007827 0.004475 [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 2.16e-05 1.77e-05 9.90e-06 8.15e-06 5.28e-05 5.73e-05 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 1.20e+01 5.76e+00 1.68e+00 6.16e-01 1.98e+01 2.01e+01 ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
Fluence Cutoff-PL 1.64e-05 1.83e-05 1.09e-05 3.95e-06 4.84e-05 4.96e-05 erg/cm2
Error 6.85e-07 3.10e-07 1.63e-07 2.60e-07 9.25e-07 9.97e-07 erg/cm2
Peak flux Cutoff-PL 9.76e+00 6.36e+00 1.60e+00 1.47e-01 1.79e+01 1.79e+01 ph/cm2/s
Error 6.29e-01 1.90e-01 8.40e-02 4.09e-02 7.04e-01 7.08e-01 ph/cm2/s
Fluence Band 1.48e-05 1.87e-05 1.06e-05 5.88e-06 4.73e-05 5.02e-05 erg/cm2
Error 9.14e-07 4.02e-07 2.08e-07 3.96e-07 1.01e-06 1.00e-06 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 2.841 0.000 - - 5.72e-02 0.00e+00 367.760 57
CPL 1.848 0.109 8.4 0.0 1.61e-01 0.00e+00 62.570 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.779 0.000 - - 8.43e-02 0.00e+00 152.380 57
CPL 1.331 0.297 19.3 4.8 5.45e-01 2.17e-01 55.250 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: 33.280000 sec.
T50 in the 50-300 keV band: 18.048000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 238.328 -1.416 236.912
T90 231.296 0.084 231.380
T50 200.072 6.524 206.596
Peak 1.000 5.220 6.220
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
306.0191 +33.8649 0.0024 0.0 133.5 78.0693 80.9 TRIG_00646721
------------------------------------------
Foreground time interval of the image:
-1.416 7.581 (delta_t = 8.997 [sec])
163.544 236.912 (delta_t = 73.368 [sec])
Background time interval of the image:
-2.456 -1.416 (delta_t = 1.040 [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
Multiple GTIs in the spectrum
tstart tstop
-1.416000 7.580900
163.544000 236.912000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.84108 ( )
Norm@50keV : 5.71539E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 367.76 using 59 PHA bins.
# Reduced chi-squared = 6.4520 for 57 degrees of freedom
# Null hypothesis probability = 5.336144e-47
Photon flux (15-150 keV) in 82.36 sec: 14.0381 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.28074e-05 ( 0 0 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-1.416000 7.580900
163.544000 236.912000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84837 ( -0.123977 0.0931357 )
Epeak [keV] : 8.42469 ( )
Norm@50keV : 0.160823 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.57 using 59 PHA bins.
# Reduced chi-squared = 1.117 for 56 degrees of freedom
# Null hypothesis probability = 2.544031e-01
Photon flux (15-150 keV) in 82.36 sec: 12.0189 ( -0.3285 0.3324 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.83607e-05 ( -9.21608e-07 9.2828e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-1.416000 7.580900
163.544000 236.912000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.63539 ( )
beta : -8.91076 ( )
Epeak [keV] : 19.5183 ( )
Norm@50keV : 0.161924 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 180.89 using 59 PHA bins.
# Reduced chi-squared = 3.2889 for 55 degrees of freedom
# Null hypothesis probability = 2.473493e-15
Photon flux (15-150 keV) in 82.36 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.72676e-05 ( -4.72671e-05 -1.01113e-06 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.9615 ( )
R^2/D10^2 : 1.96439 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 1614.32 using 59 PHA bins.
# Reduced chi-squared = 28.3214 for 57 degrees of freedom
# Null hypothesis probability = 4.496094e-300
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.895e-06 1.412e-07
25- 50 1.535e-05 3.130e-07
50-150 1.317e-05 1.977e-07
15-150 3.341e-05 5.106e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 38.9399 (-0.741513 0.764623)
Norm : 74.5461 (-2.24583 2.29898)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 109.29 using 59 PHA bins.
# Reduced chi-squared = 1.9174 for 57 degrees of freedom
# Null hypothesis probability = 3.815714e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.397e-05 3.418e-07
25- 50 1.816e-05 3.047e-07
50-150 1.364e-05 1.977e-07
15-150 4.577e-05 6.836e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.89378 (-0.241054 0.245862)
R1^2/D10^2 : 18.1752 (-2.46439 2.94882)
kT2 [keV] : 18.4498 (-0.665518 0.743868)
R2^2/D10^2 : 0.167904 (-0.0320061 0.0369526)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.19 using 59 PHA bins.
# Reduced chi-squared = 1.294 for 55 degrees of freedom
# Null hypothesis probability = 6.997145e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.218e-05 5.518e-07
25- 50 1.935e-05 4.036e-07
50-150 1.329e-05 2.718e-07
15-150 4.482e-05 8.607e-07
Peak spectrum fit
Power-law model
Time interval is from 5.220 sec. to 6.220 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.77884 ( )
Norm@50keV : 8.43122E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 152.38 using 59 PHA bins.
# Reduced chi-squared = 2.6734 for 57 degrees of freedom
# Null hypothesis probability = 1.240930e-10
Photon flux (15-150 keV) in 1 sec: 19.8408 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.23084e-07 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.220 sec. to 6.220 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33067 ( -0.307126 0.286281 )
Epeak [keV] : 19.2915 ( -5.59557 4.02404 )
Norm@50keV : 0.545145 ( -0.167619 0.265774 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.25 using 59 PHA bins.
# Reduced chi-squared = 0.9866 for 56 degrees of freedom
# Null hypothesis probability = 5.032309e-01
Photon flux (15-150 keV) in 1 sec: 17.8531 ( -0.7006 0.7069 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.36267e-07 ( -2.7506e-08 2.7692e-08 ) ergs/cm2
Band function
Time interval is from 5.220 sec. to 6.220 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.428635 ( -1.11151 1.86845 )
beta : -3.26237 ( -0.446408 0.183664 )
Epeak [keV] : 25.9921 ( -4.3883 1.91795 )
Norm@50keV : 8.35990 ( -8.29408 74.7562 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.54 using 59 PHA bins.
# Reduced chi-squared = 0.8098 for 55 degrees of freedom
# Null hypothesis probability = 8.423103e-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] : 8.45259 ( )
R^2/D10^2 : 14.6379 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 216.56 using 59 PHA bins.
# Reduced chi-squared = 3.7993 for 57 degrees of freedom
# Null hypothesis probability = 1.954630e-20
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.964e-07 8.700e-09
25- 50 3.774e-07 1.040e-08
50-150 1.184e-07 8.200e-09
15-150 6.922e-07 1.875e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 30.3294 (-1.43462 1.52932)
Norm : 146.796 (-8.94736 9.5513)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.77 using 59 PHA bins.
# Reduced chi-squared = 0.9608 for 57 degrees of freedom
# Null hypothesis probability = 5.592841e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.004e-07 1.215e-08
25- 50 3.454e-07 9.500e-09
50-150 1.918e-07 1.205e-08
15-150 8.376e-07 1.975e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.92309 (-0.49837 0.485728)
R1^2/D10^2 : 52.9079 (-13.2703 20.3785)
kT2 [keV] : 14.8056 (-1.65998 2.2171)
R2^2/D10^2 : 0.648942 (-0.333593 0.579934)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.48 using 59 PHA bins.
# Reduced chi-squared = 0.8451 for 55 degrees of freedom
# Null hypothesis probability = 7.864511e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.719e-07 2.355e-08
25- 50 3.518e-07 2.555e-08
50-150 1.941e-07 2.880e-08
15-150 8.178e-07 6.030e-08
Plot creation:
Sat Jun 27 10:33:04 EDT 2015