batgrbproduct Analysis for Trigger=317897
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 Jul 28 14:25:27 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger317897/SDC
======================================================================
Trigger: 00317897 Segment: 000
BAT Trigger Time: 238677853.568 [s; MET]
Trigger Stop: 238677853.824 [s; MET]
UTC: 2008-07-25T11:24:10.600360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 299.588797225291 Dec: 35.1728248681439 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.07
Image Trigger?: NO
Rate S/N Ratio: 9 [ if not an image trigger ]
Image S/N Ratio: 7.07
Flight Position: [ source = BAT ]
RA: 299.588797225291 Dec: 35.1728248681439 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 299.580069841578 Dec: 35.2021218452263 [deg; J2000]
{ 19h 58m 19.2s , +35d 12' 07.6" }
+/- 0.711330482799604 [arcmin] (estimated 90% radius based on SNR)
+/- 0.163518742843017 [arcmin] (formal 1-sigma fit error)
SNR: 49.4817354263761
Angular difference between Flight and Ground position is 1.809164 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 1144.37199997902 +/- 393.54502283316
Measured from: -609.751999974251
to: 534.620000004768 [s; relative to TRIGTIME]
T50: 419.588000029325 +/- 14.3389573974532
Measured from: -59.0600000023842
to: 360.528000026941 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 343.89200001955
to: 344.89200001955 [s; relative to TRIGTIME]
Total Fluence
Measured from: -673.824000000954
to: 696.240000009537 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 11.061749 13.175175 8.064987 1.407222
0.164844 0.163483 0.144157 0.126468 [error]
Peak 0.033363 0.049229 0.026929 0.006299
0.005648 0.005841 0.004988 0.004428 [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 3.40e-06 5.31e-06 6.24e-06 1.42e-05 1.91e-05 2.91e-05 erg/cm2
Error 1.41e-07 1.22e-07 1.63e-07 8.63e-07 3.89e-07 9.37e-07 erg/cm2
Peak flux Power-law 3.26e-01 3.04e-01 1.96e-01 1.96e-01 9.07e-01 1.02e+00 ph/cm2/s
Error 7.20e-02 4.46e-02 4.00e-02 7.77e-02 1.32e-01 1.53e-01 ph/cm2/s
Fluence Cutoff-PL 3.24e-06 5.36e-06 6.31e-06 1.09e-05 1.88e-05 2.58e-05 erg/cm2
Error 1.90e-07 1.30e-07 1.75e-07 2.35e-06 4.71e-07 2.43e-06 erg/cm2
Peak flux Cutoff-PL 2.81e-01 3.50e-01 1.99e-01 4.74e-02 8.67e-01 8.77e-01 ph/cm2/s
Error 8.52e-02 6.41e-02 4.87e-02 8.88e-02 1.37e-01 1.55e-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 1.768 0.041 - - 2.33e-03 4.68e-05 43.700 57
CPL 1.569 0.169 115.7 147.2 2.88e-03 5.10e-04 39.520 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.629 0.246 - - 6.99e-03 1.11e-03 51.950 57
CPL 0.338 1.417 56.4 83.6 3.66e-02 1.45e-01 48.660 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 1370.060 -673.824 696.240
T90 1144.370 -609.752 534.620
T50 419.588 -59.060 360.528
Peak 1.000 343.892 344.892
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
299.5801 +35.2021 0.0039 16.1 -139.2 10.5283 49.5 TRIG_00317897
------------------------------------------
Foreground time interval of the image:
-614.567 -603.472 (delta_t = 11.096 [sec])
-239.568 16.533 (delta_t = 256.101 [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
-673.824000 -603.471600
-239.568000 542.477500
660.432000 696.240000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76798 ( -0.0409672 0.0410606 )
Norm@50keV : 2.33169E-03 ( -4.67927e-05 4.67797e-05 )
------------------------------------------------------------
# Chi-Squared = 43.70 using 59 PHA bins.
# Reduced chi-squared = 0.7666 for 57 degrees of freedom
# Null hypothesis probability = 9.023020e-01
Photon flux (15-150 keV) in 888.2 sec: 0.317399 ( -0.00755419 0.00759399 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.90917e-05 ( -3.89229e-07 3.89507e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-673.824000 -603.471600
-239.568000 542.477500
660.432000 696.240000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56949 ( -0.172116 0.165728 )
Epeak [keV] : 115.707 ( -30.2598 264.086 )
Norm@50keV : 2.88072E-03 ( -0.000455255 0.000565025 )
------------------------------------------------------------
# Chi-Squared = 39.52 using 59 PHA bins.
# Reduced chi-squared = 0.7057 for 56 degrees of freedom
# Null hypothesis probability = 9.534018e-01
Photon flux (15-150 keV) in 888.2 sec: 0.311136 ( -0.008992 0.00906 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.87769e-05 ( -4.71634e-07 4.69858e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-673.824000 -603.471600
-239.568000 542.477500
660.432000 696.240000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.30089 ( -0.391497 2.87776 )
beta : -1.85178 ( 1.85189 0.0824623 )
Epeak [keV] : 63.6264 ( -37.1987 116.309 )
Norm@50keV : 4.15187E-03 ( -0.00158353 0.025294 )
------------------------------------------------------------
# Chi-Squared = 38.38 using 59 PHA bins.
# Reduced chi-squared = 0.6978 for 55 degrees of freedom
# Null hypothesis probability = 9.567833e-01
Photon flux (15-150 keV) in 888.2 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] : 14.5752 ( )
R^2/D10^2 : 3.47416E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 521.75 using 59 PHA bins.
# Reduced chi-squared = 9.1535 for 57 degrees of freedom
# Null hypothesis probability = 2.782806e-76
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.378e-06 5.507e-08
25- 50 5.331e-06 1.430e-07
50-150 7.607e-06 2.749e-07
15-150 1.432e-05 3.153e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 128.902 (16.8642 41.7639)
Norm : 1.29338 (-0.0395635 0.041782)
------------------------------------------------------------
# Chi-Squared = 46.49 using 59 PHA bins.
# Reduced chi-squared = 0.8156 for 57 degrees of freedom
# Null hypothesis probability = 8.386774e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.982e-06 1.115e-07
25- 50 5.400e-06 1.168e-07
50-150 9.972e-06 8.829e-07
15-150 1.835e-05 8.616e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.30501 (-0.564366 0.586726)
R1^2/D10^2 : 0.302680 (-0.0716459 0.102765)
kT2 [keV] : 25.7735 (-2.0678 2.58721)
R2^2/D10^2 : 3.30618E-03 (-0.000998261 0.00126211)
------------------------------------------------------------
# Chi-Squared = 53.18 using 59 PHA bins.
# Reduced chi-squared = 0.9670 for 55 degrees of freedom
# Null hypothesis probability = 5.443097e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.737e-06 1.945e-07
25- 50 5.491e-06 2.203e-07
50-150 1.010e-05 5.596e-07
15-150 1.833e-05 8.260e-07
Peak spectrum fit
Power-law model
Time interval is from 343.892 sec. to 344.892 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62896 ( -0.241308 0.249881 )
Norm@50keV : 6.99286E-03 ( -0.00112169 0.00110262 )
------------------------------------------------------------
# Chi-Squared = 51.95 using 59 PHA bins.
# Reduced chi-squared = 0.9114 for 57 degrees of freedom
# Null hypothesis probability = 6.645668e-01
Photon flux (15-150 keV) in 1 sec: 0.906863 ( -0.131537 0.131582 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.51807e-08 ( -1.10395e-08 1.1293e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 343.892 sec. to 344.892 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.338235 ( -1.62162 1.21243 )
Epeak [keV] : 56.4314 ( -12.675 154.586 )
Norm@50keV : 3.66443E-02 ( -0.0366478 0.253412 )
------------------------------------------------------------
# Chi-Squared = 48.66 using 59 PHA bins.
# Reduced chi-squared = 0.8689 for 56 degrees of freedom
# Null hypothesis probability = 7.462614e-01
Photon flux (15-150 keV) in 1 sec: 0.867435 ( -0.136297 0.136755 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.76545e-08 ( -1.15725e-08 1.30422e-08 ) ergs/cm2
Band function
Time interval is from 343.892 sec. to 344.892 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.294513 ( -1.02352 0.199509 )
beta : -2.45247 ( 2.6011 0.988511 )
Epeak [keV] : 54.1732 ( -28.8363 48.2571 )
Norm@50keV : 3.97974E-02 ( -0.0477446 149.983 )
------------------------------------------------------------
# Chi-Squared = 48.33 using 59 PHA bins.
# Reduced chi-squared = 0.8788 for 55 degrees of freedom
# Null hypothesis probability = 7.253878e-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] : 12.4071 (-1.79348 2.13768)
R^2/D10^2 : 0.206699 (-0.0913144 0.157189)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 52.10 using 59 PHA bins.
# Reduced chi-squared = 0.9140 for 57 degrees of freedom
# Null hypothesis probability = 6.591841e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.744e-09 1.757e-09
25- 50 2.206e-08 4.345e-09
50-150 2.086e-08 7.130e-09
15-150 4.967e-08 1.099e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 134.133 (-24.9135 -100.596)
Norm : 3.84117 (-0.617669 0.766892)
------------------------------------------------------------
# Chi-Squared = 50.16 using 59 PHA bins.
# Reduced chi-squared = 0.8799 for 57 degrees of freedom
# Null hypothesis probability = 7.275766e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.948e-09 1.805e-09
25- 50 1.813e-08 2.810e-09
50-150 3.410e-08 6.845e-09
15-150 6.217e-08 9.780e-09
Double BB
R1^2/D10^2 : 3.87209E-04 ( )
kT2 [keV] : 10.6046 (-9.40731 2.64159)
R2^2/D10^2 : 0.323916 (-0.157712 8655.64)
------------------------------------------------------------
# Chi-Squared = 48.87 using 59 PHA bins.
# Chi-Squared = 48.83 using 59 PHA bins.
# Chi-Squared = 48.73 using 59 PHA bins.
# Reduced chi-squared = 0.8886 for 55 degrees of freedom
# Reduced chi-squared = 0.8878 for 55 degrees of freedom
# Reduced chi-squared = 0.8860 for 55 degrees of freedom
# Null hypothesis probability = 7.064495e-01
# Null hypothesis probability = 7.079697e-01
# Null hypothesis probability = 7.114875e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.778e-09 4.963e-09
25- 50 1.993e-08 1.040e-08
50-150 2.744e-08 1.624e-08
15-150 5.615e-08 2.887e-08
Plot creation:
Thu Jul 28 14:54:35 EDT 2011