batgrbproduct Analysis for Trigger=597841
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 May 3 04:33:22 EDT 2014
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger597841/GCN5_download_cron
======================================================================
Trigger: 00597841 Segment: 000
BAT Trigger Time: 420712232.448 [s; MET]
Trigger Stop: 420712233.472 [s; MET]
UTC: 2014-05-02T08:30:20.489000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 319.15470216594 Dec: 49.0179516633632 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.76
Image Trigger?: NO
Rate S/N Ratio: 17.7763888346312 [ if not an image trigger ]
Image S/N Ratio: 7.76
Flight Position: [ source = BAT ]
RA: 319.15470216594 Dec: 49.0179516633632 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 319.171852861158 Dec: 48.9744921151528 [deg; J2000]
{ 21h 16m 41.2s , +48d 58' 28.2" }
+/- 1.1805986775464 [arcmin] (estimated 90% radius based on SNR)
+/- 0.432074665271245 [arcmin] (formal 1-sigma fit error)
SNR: 23.9946878834605
Angular difference between Flight and Ground position is 2.693563 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 16.8879999518394 +/- 1.88342665131759
Measured from: -0.95199990272522
to: 15.9360000491142 [s; relative to TRIGTIME]
T50: 7.13199996948242 +/- 1.17337118667986
Measured from: 1.18800008296967
to: 8.32000005245209 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.44400000572205
to: 2.44400000572205 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.66400003433228
to: 17.3919999599457 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.269443 0.339790 0.333661 0.111173
0.023587 0.024428 0.021367 0.017620 [error]
Peak 0.029880 0.046551 0.026597 0.015665
0.005609 0.005798 0.005062 0.004227 [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 6.61e-08 1.44e-07 2.46e-07 9.71e-07 6.74e-07 1.43e-06 erg/cm2
Error 9.31e-09 1.16e-08 2.07e-08 1.93e-07 5.18e-08 2.04e-07 erg/cm2
Peak flux Power-law 2.88e-01 2.90e-01 2.05e-01 2.30e-01 8.74e-01 1.01e+00 ph/cm2/s
Error 7.02e-02 4.41e-02 4.14e-02 9.50e-02 1.29e-01 1.56e-01 ph/cm2/s
Fluence Cutoff-PL 6.71e-08 1.45e-07 2.45e-07 9.52e-07 6.71e-07 1.41e-06 erg/cm2
Error 9.35e-09 1.15e-08 1.56e-08 1.92e-07 5.12e-08 2.06e-07 erg/cm2
Peak flux Cutoff-PL 2.86e-01 2.91e-01 2.06e-01 2.15e-01 8.72e-01 9.87e-01 ph/cm2/s
Error 7.49e-02 5.12e-02 4.29e-02 1.40e-01 1.31e-01 1.96e-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 1.225 0.132 - - 3.51e-03 2.40e-04 51.270 57
CPL 1.227 0.133 9999.4 0.0 3.52e-03 4.33e-04 51.310 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.500 0.264 - - 7.00e-03 1.09e-03 66.970 57
CPL 1.469 0.739 782.5 0.0 7.28e-03 1.23e-02 66.960 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: 16.896000 sec.
T50 in the 50-300 keV band: 7.168000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 19.056 -1.664 17.392
T90 16.888 -0.952 15.936
T50 7.132 1.188 8.320
Peak 1.000 1.444 2.444
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
319.1719 +48.9745 0.0080 10.5 142.0 0.9957 24.0 TRIG_00597841
------------------------------------------
Foreground time interval of the image:
-1.664 14.153 (delta_t = 15.817 [sec])
Background time interval of the image:
-239.448 -1.664 (delta_t = 237.784 [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 -1.664 sec. to 17.392 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22497 ( -0.132326 0.1313 )
Norm@50keV : 3.51143E-03 ( -0.000240108 0.000240102 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.27 using 59 PHA bins.
# Reduced chi-squared = 0.8994 for 57 degrees of freedom
# Null hypothesis probability = 6.890166e-01
Photon flux (15-150 keV) in 19.06 sec: 0.413677 ( -0.0294995 0.0296251 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.74318e-07 ( -5.16354e-08 5.19206e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.664 sec. to 17.392 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22671 ( -0.138894 0.126767 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 3.51989E-03 ( -0.000240996 0.000625791 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.31 using 59 PHA bins.
# Reduced chi-squared = 0.9163 for 56 degrees of freedom
# Null hypothesis probability = 6.525884e-01
Photon flux (15-150 keV) in 19.06 sec: 0.414192 ( -0.030001 0.028971 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.70769e-07 ( -4.82428e-08 5.42486e-08 ) ergs/cm2
Band function
Time interval is from -1.664 sec. to 17.392 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.972551 ( 0.973291 0.973291 )
beta : -1.22495 ( -0.131301 0.132308 )
Epeak [keV] : 49.5989 ( -48.8756 -48.8756 )
Norm@50keV : 6.45452E-03 ( -0.00248519 0.503427 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.27 using 59 PHA bins.
# Reduced chi-squared = 0.9321 for 55 degrees of freedom
# Null hypothesis probability = 6.180411e-01
Photon flux (15-150 keV) in 19.06 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] : 20.1551 (-1.99072 2.28867)
R^2/D10^2 : 1.78888E-02 (-0.00524909 0.00725838)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 109.73 using 59 PHA bins.
# Reduced chi-squared = 1.9251 for 57 degrees of freedom
# Null hypothesis probability = 3.408822e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.662e-08 3.812e-09
25- 50 1.333e-07 1.503e-08
50-150 4.017e-07 4.965e-08
15-150 5.616e-07 5.156e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.71710 (-0.11969 0.119673)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.79 using 59 PHA bins.
# Reduced chi-squared = 1.277 for 57 degrees of freedom
# Null hypothesis probability = 7.753157e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.152e-08 7.062e-09
25- 50 1.568e-07 2.058e-08
50-150 3.439e-07 9.856e-08
15-150 5.822e-07 1.189e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.46783 (-1.41369 1.9806)
R1^2/D10^2 : 0.950236 (-0.645166 2.50636)
kT2 [keV] : 29.3441 (-4.75133 8.34039)
R2^2/D10^2 : 4.86690E-03 (-0.00262463 0.00375828)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.36 using 59 PHA bins.
# Reduced chi-squared = 0.9520 for 55 degrees of freedom
# Null hypothesis probability = 5.761047e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.484e-08 2.874e-08
25- 50 1.277e-07 3.196e-08
50-150 4.779e-07 9.158e-08
15-150 6.805e-07 1.230e-07
Peak spectrum fit
Power-law model
Time interval is from 1.444 sec. to 2.444 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50030 ( -0.261303 0.266648 )
Norm@50keV : 6.99719E-03 ( -0.0011032 0.00108447 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.97 using 59 PHA bins.
# Reduced chi-squared = 1.175 for 57 degrees of freedom
# Null hypothesis probability = 1.721416e-01
Photon flux (15-150 keV) in 1 sec: 0.873593 ( -0.128489 0.128566 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.63756e-08 ( -1.15089e-08 1.17625e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.444 sec. to 2.444 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46859 ( -1.05008 0.427428 )
Epeak [keV] : 782.537 ( )
Norm@50keV : 7.27775E-03 ( -0.00137597 0.0232858 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.96 using 59 PHA bins.
# Reduced chi-squared = 1.196 for 56 degrees of freedom
# Null hypothesis probability = 1.497918e-01
Photon flux (15-150 keV) in 1 sec: 0.871884 ( -0.132014 0.129866 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.58343e-08 ( -1.324e-08 1.22426e-08 ) ergs/cm2
Band function
Time interval is from 1.444 sec. to 2.444 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.652988 ( 0.940165 5.54614 )
beta : -1.61628 ( 1.60124 0.348437 )
Epeak [keV] : 53.1429 ( -53.2536 627.756 )
Norm@50keV : 2.45090E-02 ( -0.0250367 994.406 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.66 using 59 PHA bins.
# Reduced chi-squared = 1.212 for 55 degrees of freedom
# Null hypothesis probability = 1.347580e-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] : 13.0240 (-2.29015 2.98597)
R^2/D10^2 : 0.160901 (-0.0831925 0.159197)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.65 using 59 PHA bins.
# Reduced chi-squared = 1.362 for 57 degrees of freedom
# Null hypothesis probability = 3.585075e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.788e-09 1.764e-09
25- 50 1.998e-08 4.890e-09
50-150 2.145e-08 6.885e-09
15-150 4.721e-08 1.173e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-96.3527 -199.363)
Norm : 3.56524 (-0.5217 0.522092)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.16 using 59 PHA bins.
# Reduced chi-squared = 1.178 for 57 degrees of freedom
# Null hypothesis probability = 1.680314e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.878e-09 5.090e-09
25- 50 1.708e-08 9.540e-09
50-150 3.745e-08 2.076e-08
15-150 6.341e-08 3.532e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.21379 (-3.13587 2.69373)
R1^2/D10^2 : 0.446547 (-0.263032 0.404797)
kT2 [keV] : 60.5898 (-60.5346 -60.5347)
R2^2/D10^2 : 9.25094E-04 (-0.000770961 0.0182188)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.16 using 59 PHA bins.
# Reduced chi-squared = 1.203 for 55 degrees of freedom
# Null hypothesis probability = 1.440875e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.785e-09 4.063e-09
25- 50 1.885e-08 9.003e-09
50-150 4.135e-08 2.081e-08
15-150 6.798e-08 3.190e-08
Plot creation:
Sat May 3 05:27:04 EDT 2014