batgrbproduct Analysis for Trigger=613775
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 Sep 27 20:11:24 EDT 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger613775/GCN5_download_cron
======================================================================
Trigger: 00613775 Segment: 000
BAT Trigger Time: 433487723.968 [s; MET]
Trigger Stop: 433487732.16 [s; MET]
UTC: 2014-09-27T05:15:11.388280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 291.844604487003 Dec: -65.3875048699422 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.16
Image Trigger?: NO
Rate S/N Ratio: 9.1104335791443 [ if not an image trigger ]
Image S/N Ratio: 7.16
Flight Position: [ source = BAT ]
RA: 291.844604487003 Dec: -65.3875048699422 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 291.802180815757 Dec: -65.399564866312 [deg; J2000]
{ 19h 27m 12.5s , -65d 23' 58.4" }
+/- 2.16948351907264 [arcmin] (estimated 90% radius based on SNR)
+/- 1.17967559478471 [arcmin] (formal 1-sigma fit error)
SNR: 10.0602622271215
Angular difference between Flight and Ground position is 1.283325 arcmin
Partial Coding Fraction: 0.546875 [ including projection effects ]
Duration
T90: 6.25599998235703 +/- 1.42603365502763
Measured from: 2.17600011825562
to: 8.43200010061264 [s; relative to TRIGTIME]
T50: 3.82799994945526 +/- 1.43990277345572
Measured from: 3.61600011587143
to: 7.44400006532669 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 7.69599997997284
to: 8.69599997997284 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.428000032901764
to: 8.69599997997284 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.137616 0.194217 0.102071 0.012856
0.028745 0.026135 0.020919 0.016804 [error]
Peak 0.046604 0.037175 0.013834 0.009557
0.010083 0.009557 0.007475 0.005869 [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 5.02e-08 7.60e-08 8.63e-08 1.87e-07 2.68e-07 3.99e-07 erg/cm2
Error 1.31e-08 1.25e-08 2.05e-08 9.35e-08 4.83e-08 1.12e-07 erg/cm2
Peak flux Power-law 4.58e-01 2.94e-01 1.22e-01 6.91e-02 9.09e-01 9.43e-01 ph/cm2/s
Error 1.59e-01 8.02e-02 5.61e-02 5.94e-02 2.44e-01 2.53e-01 ph/cm2/s
Fluence Cutoff-PL 5.00e-08 7.61e-08 8.64e-08 1.71e-07 2.67e-07 3.82e-07 erg/cm2
Error 1.31e-08 1.23e-08 2.05e-08 1.46e-07 4.96e-08 1.41e-07 erg/cm2
Peak flux Cutoff-PL 4.44e-01 3.78e-01 4.55e-02 2.40e-04 8.68e-01 8.65e-01 ph/cm2/s
Error 1.89e-01 1.67e-01 7.49e-02 3.43e-02 1.79e-01 2.45e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- 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 1.817 0.298 - - 3.53e-03 6.25e-04 56.650 57
CPL 1.815 1.006 653.3 0.0 3.54e-03 0.00e+00 56.650 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.268 0.492 - - 5.30e-03 1.90e-03 68.920 57
CPL -0.572 0.978 28.6 0.0 4.47e-01 0.00e+00 66.210 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 8.268 0.428 8.696
T90 6.256 2.176 8.432
T50 3.828 3.616 7.444
Peak 1.000 7.696 8.696
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
291.8022 -65.3996 0.0190 36.6 169.3 0.4611 10.1 TRIG_00613775
------------------------------------------
Foreground time interval of the image:
0.428 8.696 (delta_t = 8.268 [sec])
Background time interval of the image:
-239.968 0.428 (delta_t = 240.396 [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 0.428 sec. to 8.696 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81726 ( -0.294016 0.301969 )
Norm@50keV : 3.52730E-03 ( -0.000632299 0.000617468 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.65 using 59 PHA bins.
# Reduced chi-squared = 0.9938 for 57 degrees of freedom
# Null hypothesis probability = 4.883139e-01
Photon flux (15-150 keV) in 8.268 sec: 0.489345 ( -0.0818859 0.0822183 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.68337e-07 ( -4.7945e-08 4.86684e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.428 sec. to 8.696 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81463 ( -1.00393 1.00757 )
Epeak [keV] : 653.343 ( )
Norm@50keV : 3.54376E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.65 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 56 degrees of freedom
# Null hypothesis probability = 4.505299e-01
Photon flux (15-150 keV) in 8.268 sec: 0.489961 ( -0.082605 0.08076 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.67415e-07 ( -5.04604e-08 4.88308e-08 ) ergs/cm2
Band function
Time interval is from 0.428 sec. to 8.696 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.94442 ( -14.2863 -4.94442 )
beta : -2.05378 ( -0.305485 0.377386 )
Epeak [keV] : 25.5365 ( -8.9839 5.72848 )
Norm@50keV : 410.127 ( -65.3864 7157.01 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.76 using 59 PHA bins.
# Reduced chi-squared = 0.9775 for 55 degrees of freedom
# Null hypothesis probability = 5.219015e-01
Photon flux (15-150 keV) in 8.268 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] : 9.80990 (-1.84552 2.55667)
R^2/D10^2 : 0.244132 (-0.144614 0.309517)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.12 using 59 PHA bins.
# Reduced chi-squared = 1.195 for 57 degrees of freedom
# Null hypothesis probability = 1.487769e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.929e-08 1.215e-08
25- 50 9.505e-08 2.728e-08
50-150 4.691e-08 2.130e-08
15-150 1.813e-07 4.874e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.5037 (-44.8062 -99.5193)
Norm : 2.14618 (-0.474643 0.691279)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.70 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 57 degrees of freedom
# Null hypothesis probability = 4.493051e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.638e-08 1.056e-08
25- 50 8.012e-08 1.666e-08
50-150 1.295e-07 6.977e-08
15-150 2.560e-07 9.707e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.44228 (-1.65366 1.98168)
R1^2/D10^2 : 0.622884 (-0.370942 0.589279)
kT2 [keV] : 58.1544 (-33.2899 -58.1559)
R2^2/D10^2 : 4.76854E-04 (-0.000440226 0.00490618)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.51 using 59 PHA bins.
# Reduced chi-squared = 0.9365 for 55 degrees of freedom
# Null hypothesis probability = 6.089049e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.991e-08 2.286e-08
25- 50 8.439e-08 4.221e-08
50-150 1.502e-07 7.948e-08
15-150 2.845e-07 1.142e-07
Peak spectrum fit
Power-law model
Time interval is from 7.696 sec. to 8.696 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.26789 ( -0.461835 0.522942 )
Norm@50keV : 5.29571E-03 ( -0.00191455 0.00187968 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.92 using 59 PHA bins.
# Reduced chi-squared = 1.209 for 57 degrees of freedom
# Null hypothesis probability = 1.338042e-01
Photon flux (15-150 keV) in 1 sec: 0.909215 ( -0.243659 0.243798 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.03253e-08 ( -1.52431e-08 1.60153e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.696 sec. to 8.696 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.571681 ( 0.615325 2.57139 )
Epeak [keV] : 28.6088 ( )
Norm@50keV : 0.447463 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.21 using 59 PHA bins.
# Reduced chi-squared = 1.182 for 56 degrees of freedom
# Null hypothesis probability = 1.651010e-01
Photon flux (15-150 keV) in 1 sec: 0.868084 ( -0.11975 0.238646 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.87985e-08 ( -1.50991e-08 1.70283e-08 ) ergs/cm2
Band function
Time interval is from 7.696 sec. to 8.696 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.68029 -5 )
beta : -3.04215 ( -2.53888 0.807928 )
Epeak [keV] : 24.3143 ( -4.59356 5.14159 )
Norm@50keV : 1565.79 ( -388.759 4864.09 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.92 using 59 PHA bins.
# Reduced chi-squared = 1.144 for 55 degrees of freedom
# Null hypothesis probability = 2.163129e-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] : 7.26351 (-1.67388 2.25503)
R^2/D10^2 : 1.57826 (-1.07139 3.15775)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.30 using 59 PHA bins.
# Reduced chi-squared = 1.163 for 57 degrees of freedom
# Null hypothesis probability = 1.868525e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.388e-08 8.270e-09
25- 50 2.040e-08 1.071e-08
50-150 3.856e-09 2.983e-09
15-150 3.813e-08 2.164e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 36.4487 (-15.9735 41.2008)
Norm : 6.44003 (-2.64973 4.68081)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.39 using 59 PHA bins.
# Reduced chi-squared = 1.182 for 57 degrees of freedom
# Null hypothesis probability = 1.631733e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.430e-08 5.561e-09
25- 50 1.804e-08 8.078e-09
50-150 1.257e-08 9.778e-09
15-150 4.491e-08 2.028e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.83365 (-5.15061 1.95228)
R1^2/D10^2 : 1.96359 (-1.14087 7.23558)
kT2 [keV] : 200.000 ( )
R2^2/D10^2 : 5.53212E-05 (-5.53218e-05 -5.53218e-05)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.08 using 59 PHA bins.
#Fit statistic : Chi-Squared = 64.05 using 59 PHA bins.
# Reduced chi-squared = 1.165 for 55 degrees of freedom
# Reduced chi-squared = 1.164 for 55 degrees of freedom
# Null hypothesis probability = 1.880069e-01
# Null hypothesis probability = 1.888809e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.411e-08 8.210e-09
25- 50 1.961e-08 1.183e-08
50-150 1.619e-08 3.496e-09
15-150 4.991e-08 2.243e-08
Plot creation:
Sat Sep 27 20:15:08 EDT 2014