batgrbproduct Analysis for Trigger=623434
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 Jan 5 05:40:15 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger623434/GCN5_download_cron
======================================================================
Trigger: 00623434 Segment: 000
BAT Trigger Time: 442078760 [s; MET]
Trigger Stop: 442079080 [s; MET]
UTC: 2015-01-04T15:39:06.992760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 256.626928989577 Dec: 23.962538902136 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.84
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.84
Flight Position: [ source = BAT ]
RA: 256.626928989577 Dec: 23.962538902136 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 256.62933346969 Dec: 23.9742322619614 [deg; J2000]
{ 17h 06m 31.0s , +23d 58' 27.2" }
+/- 3.07881005932452 [arcmin] (estimated 90% radius based on SNR)
+/- 1.51724044230573 [arcmin] (formal 1-sigma fit error)
SNR: 6.10138636723632
Angular difference between Flight and Ground position is 0.713879 arcmin
Partial Coding Fraction: 0.90625 [ including projection effects ]
Duration
T90: 663.107999920845 +/- 78.711279292443
Measured from: -2.25999987125397
to: 660.848000049591 [s; relative to TRIGTIME]
T50: 382.043999969959 +/- 77.3966972871207
Measured from: 140.90800011158
to: 522.952000081539 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 566.504000008106
to: 567.504000008106 [s; relative to TRIGTIME]
Total Fluence
Measured from: -20.2599999904633
to: 718.600000023842 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.481658 2.434642 0.466183 0.436054
0.196992 0.185363 0.157488 0.136340 [error]
Peak 0.019984 0.025900 0.003788 0.006005
0.006870 0.006725 0.005729 0.004696 [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 7.92e-07 8.81e-07 6.99e-07 9.19e-07 2.71e-06 3.29e-06 erg/cm2
Error 9.75e-08 8.94e-08 1.35e-07 3.35e-07 3.14e-07 5.15e-07 erg/cm2
Peak flux Power-law 2.30e-01 1.41e-01 5.58e-02 2.96e-02 4.43e-01 4.57e-01 ph/cm2/s
Error 1.03e-01 5.70e-02 4.26e-02 4.77e-02 1.57e-01 1.67e-01 ph/cm2/s
Fluence Cutoff-PL 7.27e-07 1.06e-06 4.17e-07 2.57e-08 2.23e-06 2.23e-06 erg/cm2
Error 1.11e-07 1.29e-07 1.87e-07 7.42e-08 2.92e-07 3.00e-07 erg/cm2
Peak flux Cutoff-PL 2.31e-01 1.41e-01 5.49e-02 2.86e-02 4.42e-01 4.56e-01 ph/cm2/s
Error 1.02e-01 7.67e-02 5.13e-02 4.73e-02 1.57e-01 1.67e-01 ph/cm2/s
Fluence Band 7.20e-07 1.05e-06 4.56e-07 1.56e-07 2.33e-06 2.39e-06 erg/cm2
Error 1.09e-07 1.28e-07 -------- -------- -------- 5.36e-07 erg/cm2
Peak flux Band 4.51e-02 2.29e-02 8.03e-04 2.61e-06 6.87e-02 6.87e-02 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 2.333 0.192 - - 3.84e-04 5.41e-05 65.510 57
CPL 0.007 1.420 29.2 5.5 1.21e-02 6.27e-02 54.710 56
The chi2 of BB fit is 57.84 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 2.342 0.852 - - 2.47e-03 1.45e-03 38.390 57
CPL 1.970 0.000 2.9 0.0 4.28e-03 0.00e+00 38.500 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 738.860 -20.260 718.600
T90 663.108 -2.260 660.848
T50 382.044 140.908 522.952
Peak 1.000 566.504 567.504
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
256.6293 +23.9742 0.0316 21.4 164.0 2.7073 6.1 TRIG_00623434
------------------------------------------
Foreground time interval of the image:
-16.599 35.350 (delta_t = 51.949 [sec])
36.000 344.801 (delta_t = 308.801 [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
-20.260000 35.350000
36.000000 351.520000
353.000000 573.510000
575.000000 718.600000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.33263 ( -0.186716 0.197704 )
Norm@50keV : 3.83704E-04 ( -5.43417e-05 5.39064e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.51 using 59 PHA bins.
# Reduced chi-squared = 1.149 for 57 degrees of freedom
# Null hypothesis probability = 2.053731e-01
Photon flux (15-150 keV) in 735.2 sec: 6.82947E-02 ( -0.00649335 0.00649395 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.71246e-06 ( -3.09917e-07 3.18881e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-20.260000 35.350000
36.000000 351.520000
353.000000 573.510000
575.000000 718.600000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.76898E-03 ( -1.54728 1.2918 )
Epeak [keV] : 29.1670 ( -6.93462 4.10653 )
Norm@50keV : 1.21420E-02 ( -0.0121467 0.113335 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.71 using 59 PHA bins.
# Reduced chi-squared = 0.9770 for 56 degrees of freedom
# Null hypothesis probability = 5.237673e-01
Photon flux (15-150 keV) in 735.2 sec: 6.39886E-02 ( -0.0065746 0.0066422 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.2304e-06 ( -2.67848e-07 3.16746e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-20.260000 35.350000
36.000000 351.520000
353.000000 573.510000
575.000000 718.600000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.442347 ( -0.938387 0.361503 )
beta : -3.65146 ( 3.83165 1.21311 )
Epeak [keV] : 28.4230 ( -4.72084 4.33083 )
Norm@50keV : 6.25163E-03 ( -0.0129567 33.6919 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.27 using 59 PHA bins.
# Reduced chi-squared = 0.9868 for 55 degrees of freedom
# Null hypothesis probability = 5.023839e-01
Photon flux (15-150 keV) in 735.2 sec: 6.87471E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33025e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.85396 (-0.710961 0.77818)
R^2/D10^2 : 8.21347E-02 (-0.0265685 0.0395238)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.84 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 57 degrees of freedom
# Null hypothesis probability = 4.440600e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.642e-07 8.466e-08
25- 50 1.126e-06 1.379e-07
50-150 2.781e-07 9.227e-08
15-150 2.068e-06 2.562e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 36.0792 (-7.27554 10.1248)
Norm : 0.477330 (-0.0845674 0.105053)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.54 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 57 degrees of freedom
# Null hypothesis probability = 4.550999e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.761e-07 9.153e-08
25- 50 9.746e-07 1.184e-07
50-150 6.709e-07 2.027e-07
15-150 2.422e-06 3.103e-07
Double BB
R1^2/D10^2 : 8.58344E-06 ( )
kT2 [keV] : 7.43654 (-0.718418 0.820191)
R2^2/D10^2 : 9.91086E-02 (-0.0335982 0.0515691)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.64 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.41 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.39 using 59 PHA bins.
# Reduced chi-squared = 0.9935 for 55 degrees of freedom
# Reduced chi-squared = 0.9529 for 55 degrees of freedom
# Reduced chi-squared = 0.9526 for 55 degrees of freedom
# Null hypothesis probability = 4.881985e-01
# Null hypothesis probability = 5.741474e-01
# Null hypothesis probability = 5.748825e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.304e-07 3.805e-07
25- 50 1.061e-06 5.415e-07
50-150 4.129e-07 2.354e-07
15-150 2.205e-06 1.116e-06
Peak spectrum fit
Power-law model
Time interval is from 566.504 sec. to 567.504 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.34214 ( -0.720031 0.984599 )
Norm@50keV : 2.47320E-03 ( -0.00147064 0.00142803 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.39 using 59 PHA bins.
# Reduced chi-squared = 0.6736 for 57 degrees of freedom
# Null hypothesis probability = 9.722456e-01
Photon flux (15-150 keV) in 1 sec: 0.442578 ( -0.157286 0.157457 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.38274e-08 ( -1.0655e-08 1.20582e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 566.504 sec. to 567.504 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96954 ( )
Epeak [keV] : 2.94094 ( )
Norm@50keV : 4.27542E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.50 using 59 PHA bins.
# Reduced chi-squared = 0.6875 for 56 degrees of freedom
# Null hypothesis probability = 9.641526e-01
Photon flux (15-150 keV) in 1 sec: 0.442074 ( -0.156787 0.156968 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.36285e-08 ( -1.20434e-08 1.20264e-08 ) ergs/cm2
Band function
Time interval is from 566.504 sec. to 567.504 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.66666 ( 1.66633 1.66633 )
beta : -2.57132 ( 2.56576 0.933737 )
Epeak [keV] : 15.0481 ( -17.2492 -17.2492 )
Norm@50keV : 7.21474E-03 ( -0.00874807 3707.4 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.32 using 59 PHA bins.
# Reduced chi-squared = 0.6967 for 55 degrees of freedom
# Null hypothesis probability = 9.574780e-01
Photon flux (15-150 keV) in 1 sec: 6.87471E-02 ( ) 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] : 7.04624 (-2.29369 3.21061)
R^2/D10^2 : 0.823667 (-0.823666 3.4164)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.19 using 59 PHA bins.
# Reduced chi-squared = 0.6875 for 57 degrees of freedom
# Null hypothesis probability = 9.655105e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.614e-09 4.048e-09
25- 50 9.174e-09 6.085e-09
50-150 1.557e-09 1.331e-09
15-150 1.735e-08 1.135e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 33.4555 (-20.1457 110.221)
Norm : 3.24079 (-1.76507 5.15385)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.64 using 59 PHA bins.
# Reduced chi-squared = 0.6779 for 57 degrees of freedom
# Null hypothesis probability = 9.702777e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.946e-09 4.176e-09
25- 50 8.406e-09 5.285e-09
50-150 5.286e-09 4.682e-09
15-150 2.064e-08 1.340e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.227 ( )
R1^2/D10^2 : 3.81051E-05 (-3.89509e-05 0.000696646)
kT2 [keV] : 6.66208 (-2.44844 2.51517)
R2^2/D10^2 : 0.989116 (-1.00311 147.812)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.66 using 59 PHA bins.
#Fit statistic : Chi-Squared = 37.27 using 59 PHA bins.
# Reduced chi-squared = 0.7029 for 55 degrees of freedom
# Reduced chi-squared = 0.6776 for 55 degrees of freedom
# Null hypothesis probability = 9.536315e-01
# Null hypothesis probability = 9.679375e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.853e-09 3.716e-09
25- 50 8.814e-09 5.665e-09
50-150 2.593e-09 1.804e-09
15-150 1.826e-08 1.078e-08
Plot creation:
Mon Jan 5 05:44:44 EST 2015