batgrbproduct Analysis for Trigger=613581
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): Thu Sep 25 10:46:20 EDT 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger613581/GCN5_download_cron
======================================================================
Trigger: 00613581 Segment: 000
BAT Trigger Time: 433278329.024 [s; MET]
Trigger Stop: 433278355.904 [s; MET]
UTC: 2014-09-24T19:05:16.454560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 135.499129971589 Dec: -40.5547432458479 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 11.48
Image Trigger?: NO
Rate S/N Ratio: 15.6843871413581 [ if not an image trigger ]
Image S/N Ratio: 11.48
Flight Position: [ source = BAT ]
RA: 135.499129971589 Dec: -40.5547432458479 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 135.578632721022 Dec: -40.5539648353299 [deg; J2000]
{ 09h 02m 18.9s , -40d 33' 14.3" }
+/- 2.86921456192418 [arcmin] (estimated 90% radius based on SNR)
+/- 1.53668017789275 [arcmin] (formal 1-sigma fit error)
SNR: 6.74793980078383
Angular difference between Flight and Ground position is 3.624622 arcmin
Partial Coding Fraction: 0.9296875 [ including projection effects ]
Duration
T90: 989.683999955654 +/- 107.530337112338
Measured from: -128.751999855042
to: 860.932000100613 [s; relative to TRIGTIME]
T50: 510.207999944687 +/- 81.7350943789404
Measured from: 7.8280001282692
to: 518.036000072956 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -116.920000016689
to: -115.920000016689 [s; relative to TRIGTIME]
Total Fluence
Measured from: -162.459999978542
to: 885.396000027657 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 11.892542 8.494156 0.294292 0.273947
0.189668 0.190303 0.161318 0.143858 [error]
Peak 0.035590 0.020540 0.018337 0.008874
0.005985 0.006001 0.005024 0.004366 [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 4.86e-06 3.02e-06 1.21e-06 6.55e-07 9.43e-06 9.75e-06 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 3.06e-01 2.28e-01 1.13e-01 8.04e-02 6.85e-01 7.28e-01 ph/cm2/s
Error 9.80e-02 4.81e-02 4.61e-02 6.58e-02 1.43e-01 1.55e-01 ph/cm2/s
Fluence Cutoff-PL 3.67e-06 3.63e-06 3.12e-07 4.42e-10 7.62e-06 7.62e-06 erg/cm2
Error 3.09e-07 1.57e-07 8.67e-08 7.35e-10 3.74e-07 3.74e-07 erg/cm2
Peak flux Cutoff-PL 3.06e-01 2.28e-01 1.13e-01 7.94e-02 6.85e-01 7.27e-01 ph/cm2/s
Error 9.68e-02 4.80e-02 4.54e-02 8.46e-02 1.43e-01 1.53e-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 3.320 0.000 - - 6.37e-04 0.00e+00 232.910 57
CPL -1.890 0.986 23.4 1.6 1.77e+00 4.84e+00 61.360 56
The chi2 of BB fit is 61.12 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 2.009 0.487 - - 4.55e-03 1.36e-03 66.450 57
CPL 1.999 0.530 9999.3 -4999.0 4.57e-03 0.00e+00 66.460 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 1047.860 -162.460 885.396
T90 989.684 -128.752 860.932
T50 510.208 7.828 518.036
Peak 1.000 -116.920 -115.920
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
135.5786 -40.5540 0.0286 25.0 -169.8 8.8758 6.7 TRIG_00613581
------------------------------------------
Foreground time interval of the image:
-162.460 -146.954 (delta_t = 15.506 [sec])
-146.024 -70.634 (delta_t = 75.390 [sec])
-70.024 783.036 (delta_t = 853.060 [sec])
783.976 885.396 (delta_t = 101.420 [sec])
Background time interval of the image:
-239.024 -162.460 (delta_t = 76.564 [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
-162.460000 -146.954000
-146.024000 -70.634000
-70.024000 783.036000
783.976000 885.396000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.32039 ( )
Norm@50keV : 6.37206E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 232.91 using 59 PHA bins.
# Reduced chi-squared = 4.0861 for 57 degrees of freedom
# Null hypothesis probability = 3.993097e-23
Photon flux (15-150 keV) in 1045 sec: 0.223297 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.42805e-06 ( 0 0 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-162.460000 -146.954000
-146.024000 -70.634000
-70.024000 783.036000
783.976000 885.396000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.88957 ( -1.09666 0.874779 )
Epeak [keV] : 23.4266 ( -1.66363 1.44328 )
Norm@50keV : 1.77045 ( -1.86418 7.8236 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.36 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 56 degrees of freedom
# Null hypothesis probability = 2.897507e-01
Photon flux (15-150 keV) in 1045 sec: 0.183061 ( -0.010553 0.010657 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.61534e-06 ( -3.71936e-07 3.75354e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-162.460000 -146.954000
-146.024000 -70.634000
-70.024000 783.036000
783.976000 885.396000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.88763 ( -1.14387 1.83192 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 23.4175 ( -1.63598 1.34722 )
Norm@50keV : 1.76834 ( -1.76739 8.00439 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.44 using 59 PHA bins.
# Reduced chi-squared = 1.117 for 55 degrees of freedom
# Null hypothesis probability = 2.563717e-01
Photon flux (15-150 keV) in 1045 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] : 5.94340 (-0.184008 0.19012)
R^2/D10^2 : 0.767565 (-0.113619 0.133766)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.12 using 59 PHA bins.
# Reduced chi-squared = 1.072 for 57 degrees of freedom
# Null hypothesis probability = 3.302182e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.713e-06 2.304e-07
25- 50 3.627e-06 1.557e-07
50-150 3.194e-07 5.204e-08
15-150 7.660e-06 2.801e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.5816 (-0.959007 1.03879)
Norm : 3.31136 (-0.332544 0.372369)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 108.85 using 59 PHA bins.
# Reduced chi-squared = 1.9096 for 57 degrees of freedom
# Null hypothesis probability = 4.273344e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.494e-06 2.289e-07
25- 50 3.366e-06 1.463e-07
50-150 7.216e-07 1.115e-07
15-150 8.582e-06 3.177e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.16245 (-5.96333 193.647)
R1^2/D10^2 : 3981.21 ( )
kT2 [keV] : 5.97255 (-0.189424 3.18574)
R2^2/D10^2 : 0.746440 (-0.746489 0.135924)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.13 using 59 PHA bins.
#Fit statistic : Chi-Squared = 60.46 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 55 degrees of freedom
# Reduced chi-squared = 1.099 for 55 degrees of freedom
# Null hypothesis probability = 2.654169e-01
# Null hypothesis probability = 2.852549e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.713e-06 2.328e+00
25- 50 3.628e-06 2.219e+01
50-150 3.198e-07 5.037e+02
15-150 7.661e-06 5.163e+02
Peak spectrum fit
Power-law model
Time interval is from -116.920 sec. to -115.920 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.00890 ( -0.452833 0.520702 )
Norm@50keV : 4.55009E-03 ( -0.00142978 0.00128396 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.45 using 59 PHA bins.
# Reduced chi-squared = 1.166 for 57 degrees of freedom
# Null hypothesis probability = 1.834113e-01
Photon flux (15-150 keV) in 1 sec: 0.685324 ( -0.14274 0.142731 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.19777e-08 ( -1.13734e-08 1.18411e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -116.920 sec. to -115.920 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99931 ( -0.527115 0.533675 )
Epeak [keV] : 9999.31 ( -1.36633 -9999.36 )
Norm@50keV : 4.56950E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.46 using 59 PHA bins.
# Reduced chi-squared = 1.187 for 56 degrees of freedom
# Null hypothesis probability = 1.599888e-01
Photon flux (15-150 keV) in 1 sec: 0.685032 ( -0.142611 0.142624 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.14383e-08 ( -1.08487e-08 1.24124e-08 ) ergs/cm2
Band function
Time interval is from -116.920 sec. to -115.920 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99753 ( -4.99753 -4.99753 )
beta : -2.04211 ( -0.617751 0.474183 )
Epeak [keV] : 17.3994 ( -17.3994 6.08832 )
Norm@50keV : 8356.44 ( -1738.47 9.72677e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.39 using 59 PHA bins.
# Reduced chi-squared = 1.207 for 55 degrees of freedom
# Null hypothesis probability = 1.397068e-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] : 5.46262 (-1.47914 3.21516)
R^2/D10^2 : 3.25573 (-3.2325 10.5172)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.45 using 59 PHA bins.
# Reduced chi-squared = 1.429 for 57 degrees of freedom
# Null hypothesis probability = 1.847113e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.114e-08 5.924e-09
25- 50 8.992e-09 5.045e-09
50-150 5.514e-10 4.842e-10
15-150 2.068e-08 1.232e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 89.2237 (-54.3043 -89.7087)
Norm : 3.01884 (-0.851887 1.75165)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.75 using 59 PHA bins.
# Reduced chi-squared = 1.224 for 57 degrees of freedom
# Null hypothesis probability = 1.196687e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.875e-09 2.723e-09
25- 50 1.329e-08 5.534e-09
50-150 2.014e-08 1.435e-08
15-150 4.130e-08 2.429e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.09212 (-1.03983 1.36274)
R1^2/D10^2 : 10.4171 (-7.70361 30.969)
kT2 [keV] : 29.8379 (-10.8122 34.8376)
R2^2/D10^2 : 5.34969E-03 (-0.00462645 0.0170726)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.09 using 59 PHA bins.
# Reduced chi-squared = 1.093 for 55 degrees of freedom
# Null hypothesis probability = 2.964672e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.132e-08 6.364e-09
25- 50 8.671e-09 4.304e-09
50-150 2.906e-08 1.790e-08
15-150 4.904e-08 2.650e-08
Plot creation:
Thu Sep 25 10:49:39 EDT 2014