batgrbproduct Analysis for Trigger=596958
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 Apr 24 10:44:11 EDT 2014
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger596958/GCN5_download_cron
======================================================================
Trigger: 00596958 Segment: 000
BAT Trigger Time: 419980040 [s; MET]
Trigger Stop: 419980104 [s; MET]
UTC: 2014-04-23T21:07:08.075860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 202.927754553838 Dec: 29.2583028285461 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.9
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.9
Flight Position: [ source = BAT ]
RA: 202.927754553838 Dec: 29.2583028285461 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 202.920782401477 Dec: 29.2416425131672 [deg; J2000]
{ 13h 31m 41.0s , +29d 14' 29.9" }
+/- 2.46501572635026 [arcmin] (estimated 90% radius based on SNR)
+/- 1.00690202232681 [arcmin] (formal 1-sigma fit error)
SNR: 8.38254627330883
Angular difference between Flight and Ground position is 1.064169 arcmin
Partial Coding Fraction: 0.9375 [ including projection effects ]
Duration
T90: 287.807999908924 +/- 57.1458757449667
Measured from: -18.2839998602867
to: 269.524000048637 [s; relative to TRIGTIME]
T50: 161.203999996185 +/- 73.1183431402331
Measured from: 44.8120000958443
to: 206.01600009203 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 37.5320000052452
to: 38.5320000052452 [s; relative to TRIGTIME]
Total Fluence
Measured from: -29.4319999814034
to: 336.776000022888 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.095479 0.674108 0.217141 0.031486
0.094748 0.097896 0.087170 0.081871 [error]
Peak 0.012639 0.013245 0.011189 0.006608
0.005133 0.005298 0.004761 0.004271 [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 3.00e-07 2.81e-07 1.83e-07 1.84e-07 8.40e-07 9.49e-07 erg/cm2
Error 4.71e-08 4.83e-08 6.59e-08 1.23e-07 1.53e-07 2.25e-07 erg/cm2
Peak flux Power-law 6.07e-02 8.55e-02 8.93e-02 1.72e-01 2.90e-01 4.07e-01 ph/cm2/s
Error 5.48e-02 6.45e-02 3.73e-02 2.03e-01 2.03e-01 1.95e-01 ph/cm2/s
Fluence Cutoff-PL 2.97e-07 2.98e-07 1.53e-07 3.18e-08 7.80e-07 8.79e-07 erg/cm2
Error 4.88e-08 5.99e-08 9.08e-08 1.70e-07 1.77e-07 2.84e-07 erg/cm2
Peak flux Cutoff-PL 6.35e-02 8.72e-02 8.87e-02 1.64e-01 2.92e-01 4.04e-01 ph/cm2/s
Error 6.12e-02 6.46e-02 3.78e-02 2.22e-01 1.16e-01 1.86e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.620 0.333 - - 2.22e-04 5.88e-05 49.500 57
CPL 1.942 0.000 2.8 0.0 6.29e-04 0.00e+00 48.840 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.937 0.883 - - 2.52e-03 1.04e-03 33.370 57
CPL 0.959 0.984 9999.4 0.0 2.55e-03 8.04e-03 33.380 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 366.208 -29.432 336.776
T90 287.808 -18.284 269.524
T50 161.204 44.812 206.016
Peak 1.000 37.532 38.532
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
202.9208 +29.2416 0.0230 13.1 126.2 1.0202 8.4 TRIG_00596958
------------------------------------------
Foreground time interval of the image:
-29.432 72.501 (delta_t = 101.933 [sec])
Background time interval of the image:
-239.000 -235.210 (delta_t = 3.790 [sec])
-234.000 -29.432 (delta_t = 204.568 [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
-29.432000 324.970000
326.000100 336.776000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.61973 ( -0.310567 0.355076 )
Norm@50keV : 2.22183E-04 ( -5.82704e-05 5.9326e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.50 using 59 PHA bins.
# Reduced chi-squared = 0.8683 for 57 degrees of freedom
# Null hypothesis probability = 7.495751e-01
Photon flux (15-150 keV) in 365.2 sec: 4.70551E-02 ( -0.00627169 0.00627922 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.40384e-07 ( -1.48559e-07 1.58418e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-29.432000 324.970000
326.000100 336.776000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94187 ( )
Epeak [keV] : 2.79842 ( )
Norm@50keV : 6.29128E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.84 using 59 PHA bins.
# Reduced chi-squared = 0.8722 for 56 degrees of freedom
# Null hypothesis probability = 7.400698e-01
Photon flux (15-150 keV) in 365.2 sec: 4.61785E-02 ( -0.0063671 0.0064851 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.79914e-07 ( -1.56331e-07 1.97814e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-29.432000 324.970000
326.000100 336.776000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.85635 ( 1.15 1.15 )
beta : -4.36010 ( 4.27375 13.8002 )
Epeak [keV] : 6.16621 ( -6.16611 5.09695 )
Norm@50keV : 7.14463E-04 ( -0.000151735 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.86 using 59 PHA bins.
# Reduced chi-squared = 0.8883 for 55 degrees of freedom
# Null hypothesis probability = 7.071223e-01
Photon flux (15-150 keV) in 365.2 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] : 6.27616 (-0.935714 1.08744)
R^2/D10^2 : 0.138535 (-0.0679404 0.13968)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.92 using 59 PHA bins.
# Reduced chi-squared = 0.9810 for 57 degrees of freedom
# Null hypothesis probability = 5.156814e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.817e-07 6.869e-08
25- 50 3.093e-07 8.363e-08
50-150 3.395e-08 1.859e-08
15-150 6.250e-07 1.433e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 26.2797 (-7.53611 11.5998)
Norm : 0.423445 (-0.117542 0.184192)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.25 using 59 PHA bins.
# Reduced chi-squared = 0.8640 for 57 degrees of freedom
# Null hypothesis probability = 7.576931e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.922e-07 5.277e-08
25- 50 3.091e-07 6.115e-08
50-150 1.413e-07 7.277e-08
15-150 7.426e-07 1.528e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.35972 (-2.31625 1.57096)
R1^2/D10^2 : 0.507803 (-0.353718 20.9964)
kT2 [keV] : 13.0089 (-10.9624 15.7654)
R2^2/D10^2 : 3.79365E-03 (-0.00364737 0.0531472)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.82 using 59 PHA bins.
# Reduced chi-squared = 0.8876 for 55 degrees of freedom
# Null hypothesis probability = 7.085169e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.019e-07 1.598e-07
25- 50 2.870e-07 1.468e-07
50-150 1.858e-07 1.176e-07
15-150 7.746e-07 3.995e-07
Peak spectrum fit
Power-law model
Time interval is from 37.532 sec. to 38.532 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.936709 ( -0.994064 0.771899 )
Norm@50keV : 2.52180E-03 ( -0.00110361 0.000981467 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.37 using 59 PHA bins.
# Reduced chi-squared = 0.5854 for 57 degrees of freedom
# Null hypothesis probability = 9.947637e-01
Photon flux (15-150 keV) in 1 sec: 0.289614 ( -0.289616 0.116327 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.79081e-08 ( -1.15652e-08 1.18435e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 37.532 sec. to 38.532 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.959094 ( -1.21718 0.751063 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 2.54620E-03 ( -0.0010815 0.0150084 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.38 using 59 PHA bins.
# Reduced chi-squared = 0.5960 for 56 degrees of freedom
# Null hypothesis probability = 9.929678e-01
Photon flux (15-150 keV) in 1 sec: 0.291707 ( -0.117166 0.114267 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.74817e-08 ( -1.1232e-08 5.9307e-09 ) ergs/cm2
Band function
Time interval is from 37.532 sec. to 38.532 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.820193 ( 0.820165 0.820165 )
beta : -0.936647 ( 0.936596 0.993948 )
Epeak [keV] : 34.3099 ( -34.3181 -34.3181 )
Norm@50keV : 3.87651E-03 ( -0.00230946 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.37 using 59 PHA bins.
# Reduced chi-squared = 0.6067 for 55 degrees of freedom
# Null hypothesis probability = 9.907018e-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] : 28.9569 (-29.116 -29.116)
R^2/D10^2 : 4.34315E-03 (-0.00424212 0.0575222)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.17 using 59 PHA bins.
# Reduced chi-squared = 0.6345 for 57 degrees of freedom
# Null hypothesis probability = 9.858403e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.821e-10 3.798e-10
25- 50 3.538e-09 2.223e-09
50-150 2.123e-08 1.377e-08
15-150 2.535e-08 1.623e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-126.858 -199.363)
Norm : 1.18713 (-0.475106 0.475121)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.38 using 59 PHA bins.
# Reduced chi-squared = 0.6207 for 57 degrees of freedom
# Null hypothesis probability = 9.891143e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.956e-09 1.989e-09
25- 50 5.686e-09 3.805e-09
50-150 1.247e-08 8.160e-09
15-150 2.111e-08 1.359e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.07963 (-5.21115 12.2256)
R1^2/D10^2 : 0.190975 (-0.182965 11.0059)
kT2 [keV] : 97.8978 (-99.7537 -99.7539)
R2^2/D10^2 : 2.36003E-04 (-0.000191621 0.00166099)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.23 using 59 PHA bins.
# Reduced chi-squared = 0.5860 for 55 degrees of freedom
# Null hypothesis probability = 9.939221e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.411e-09 1.643e-09
25- 50 5.173e-09 3.637e-09
50-150 2.303e-08 1.244e-08
15-150 3.062e-08 2.011e-08
Plot creation:
Thu Apr 24 11:07:16 EDT 2014