batgrbproduct Analysis for Trigger=321376
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 13:36:15 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger321376/SDC
======================================================================
Trigger: 00321376 Segment: 000
BAT Trigger Time: 241131776 [s; MET]
Trigger Stop: 241131840 [s; MET]
UTC: 2008-08-22T21:02:52.960620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 63.4950367894906 Dec: 25.7428354460579 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.15
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.15
Flight Position: [ source = BAT ]
RA: 63.4950367894906 Dec: 25.7428354460579 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 63.5602949701745 Dec: 25.75986992077 [deg; J2000]
{ 04h 14m 14.5s , +25d 45' 35.5" }
+/- 3.60767125277164 [arcmin] (estimated 90% radius based on SNR)
+/- 1.94827541753893 [arcmin] (formal 1-sigma fit error)
SNR: 4.86496669731541
Angular difference between Flight and Ground position is 3.671755 arcmin
Partial Coding Fraction: 0.8203125 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.216379 0.195504 -0.011686 -0.017961
0.042473 0.042265 0.036346 0.030853 [error]
Peak 0.216379 0.195504 -0.011686 -0.017961
0.042473 0.042265 0.036346 0.030853 [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 5.99e-08 5.82e-08 3.94e-08 4.19e-08 1.74e-07 2.01e-07 erg/cm2
Error 1.79e-08 1.94e-08 2.39e-08 5.30e-08 6.22e-08 8.97e-08 erg/cm2
Peak flux Power-law 3.09e-02 1.67e-02 5.67e-03 2.50e-03 5.47e-02 5.58e-02 ph/cm2/s
Error 9.37e-03 5.41e-03 3.34e-03 2.99e-03 1.52e-02 1.58e-02 ph/cm2/s
Fluence Cutoff-PL 5.54e-08 8.89e-08 1.52e-08 6.80e-11 1.60e-07 1.60e-07 erg/cm2
Error 2.14e-08 2.99e-08 2.13e-08 2.10e-09 4.59e-08 4.59e-08 erg/cm2
Peak flux Cutoff-PL 2.73e-02 2.59e-02 2.53e-03 6.16e-06 5.57e-02 5.58e-02 ph/cm2/s
Error 1.11e-02 8.32e-03 3.28e-03 1.73e-04 1.14e-02 1.44e-02 ph/cm2/s
Fluence Band 5.44e-08 8.84e-08 1.53e-08 1.63e-10 1.60e-07 1.60e-07 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 2.57e-02 2.67e-02 1.96e-03 7.83e-06 5.44e-02 5.71e-02 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 2.570 0.543 - - 2.66e-04 1.24e-04 76.470 57
CPL -1.910 4.354 29.0 6.0 2.40e-01 1.30e+03 68.750 56
The chi2 of BB fit is 68.76 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 2.570 0.543 - - 2.66e-04 1.24e-04 76.470 57
CPL -1.910 4.354 29.0 5.6 2.40e-01 1.30e+03 68.750 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
63.5603 +25.7599 0.0395 21.7 28.7 0.3959 4.9 TRIG_00321376
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.57030 ( -0.474568 0.61169 )
Norm@50keV : 2.66024E-04 ( -0.00011971 0.000129215 )
------------------------------------------------------------
# Chi-Squared = 76.47 using 59 PHA bins.
# Reduced chi-squared = 1.342 for 57 degrees of freedom
# Null hypothesis probability = 4.357038e-02
Photon flux (15-150 keV) in 64 sec: 5.46513E-02 ( -0.0150589 0.0153307 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74406e-07 ( -5.88571e-08 6.5511e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.91034 ( -5.84857 2.8594 )
Epeak [keV] : 29.0396 ( -5.48957 6.58695 )
Norm@50keV : 0.240432 ( -0.285467 2591.31 )
------------------------------------------------------------
# Chi-Squared = 68.75 using 59 PHA bins.
# Reduced chi-squared = 1.228 for 56 degrees of freedom
# Null hypothesis probability = 1.178567e-01
Photon flux (15-150 keV) in 64 sec: 5.57309E-02 ( -0.0142651 0.008522 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59743e-07 ( -4.4103e-08 4.76026e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.97769 ( -2.70396 -1.76051 )
beta : -9.99958 ( 7495.05 7505.04 )
Epeak [keV] : 29.0685 ( -8.77403 6.57713 )
Norm@50keV : 0.266861 ( -0.275561 13.9985 )
------------------------------------------------------------
# Chi-Squared = 68.74 using 59 PHA bins.
# Reduced chi-squared = 1.250 for 55 degrees of freedom
# Null hypothesis probability = 1.007906e-01
Photon flux (15-150 keV) in 64 sec: 5.439905E-02 ( -0.0135824 0.0136682 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59632e-07 ( -4.3289e-08 3.97741e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.41805 (-1.51671 1.76439)
R^2/D10^2 : 9.50789E-02 (-0.0559155 0.144237)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 68.76 using 59 PHA bins.
# Reduced chi-squared = 1.206 for 57 degrees of freedom
# Null hypothesis probability = 1.366698e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.691e-08 3.108e-08
25- 50 8.698e-08 4.235e-08
50-150 1.770e-08 1.379e-08
15-150 1.616e-07 9.645e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 27.4367 (-11.0484 20.084)
Norm : 0.503888 (-0.197292 0.331779)
------------------------------------------------------------
# Chi-Squared = 72.41 using 59 PHA bins.
# Reduced chi-squared = 1.270 for 57 degrees of freedom
# Null hypothesis probability = 8.199443e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.252e-08 2.545e-08
25- 50 6.787e-08 3.593e-08
50-150 3.295e-08 2.851e-08
15-150 1.633e-07 9.325e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.66605 (-7.60332 -7.60332)
R1^2/D10^2 : 3.20208E-03 (-0.00324255 -0.00324255)
kT2 [keV] : 7.39827 (-7.4127 -7.4127)
R2^2/D10^2 : 9.23664E-02 (-0.0923438 -0.0923438)
------------------------------------------------------------
# Chi-Squared = 68.76 using 59 PHA bins.
# Reduced chi-squared = 1.250 for 55 degrees of freedom
# Null hypothesis probability = 1.004702e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.696e-08 2.125e-02
25- 50 8.685e-08 1.868e-01
50-150 1.760e-08 3.923e+00
15-150 1.614e-07 5.344e+00
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.57030 ( -0.474568 0.61169 )
Norm@50keV : 2.66024E-04 ( -0.00011971 0.000129215 )
------------------------------------------------------------
# Chi-Squared = 76.47 using 59 PHA bins.
# Reduced chi-squared = 1.342 for 57 degrees of freedom
# Null hypothesis probability = 4.357038e-02
Photon flux (15-150 keV) in 64 sec: 5.46513E-02 ( -0.0150589 0.0153307 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74406e-07 ( -5.88571e-08 6.5511e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.91034 ( -5.84857 2.8594 )
Epeak [keV] : 29.0396 ( -4.6746 6.58713 )
Norm@50keV : 0.240432 ( -0.285467 2591.31 )
------------------------------------------------------------
# Chi-Squared = 68.75 using 59 PHA bins.
# Reduced chi-squared = 1.228 for 56 degrees of freedom
# Null hypothesis probability = 1.178567e-01
Photon flux (15-150 keV) in 64 sec: 5.57309E-02 ( -0.0142651 0.008522 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59743e-07 ( -4.4103e-08 4.76026e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.97769 ( -2.70396 -1.76051 )
beta : -9.99958 ( 7495.05 7505.04 )
Epeak [keV] : 29.0685 ( -8.77403 6.57713 )
Norm@50keV : 0.266861 ( -0.275561 13.9985 )
------------------------------------------------------------
# Chi-Squared = 68.74 using 59 PHA bins.
# Reduced chi-squared = 1.250 for 55 degrees of freedom
# Null hypothesis probability = 1.007906e-01
Photon flux (15-150 keV) in 64 sec: 5.439905E-02 ( -0.0135824 0.0136682 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59632e-07 ( -4.3289e-08 3.97741e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.41805 (-1.51671 1.76439)
R^2/D10^2 : 9.50789E-02 (-0.0559155 0.144237)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 68.76 using 59 PHA bins.
# Reduced chi-squared = 1.206 for 57 degrees of freedom
# Null hypothesis probability = 1.366698e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.691e-08 3.183e-08
25- 50 8.698e-08 5.046e-08
50-150 1.770e-08 1.322e-08
15-150 1.616e-07 9.105e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 27.4367 (-11.0484 20.084)
Norm : 0.503888 (-0.197292 0.331779)
------------------------------------------------------------
# Chi-Squared = 72.41 using 59 PHA bins.
# Reduced chi-squared = 1.270 for 57 degrees of freedom
# Null hypothesis probability = 8.199443e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.252e-08 2.918e-08
25- 50 6.787e-08 3.957e-08
50-150 3.295e-08 2.936e-08
15-150 1.633e-07 8.779e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.66605 (-7.60332 -7.60332)
R1^2/D10^2 : 3.20208E-03 (-0.00324255 -0.00324255)
kT2 [keV] : 7.39827 (-7.4127 -7.4127)
R2^2/D10^2 : 9.23664E-02 (-0.0923438 -0.0923438)
------------------------------------------------------------
# Chi-Squared = 68.76 using 59 PHA bins.
# Reduced chi-squared = 1.250 for 55 degrees of freedom
# Null hypothesis probability = 1.004702e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.696e-08 2.181e-02
25- 50 8.685e-08 1.800e-01
50-150 1.760e-08 4.106e+00
15-150 1.614e-07 4.138e+00
Plot creation:
Thu Jul 28 13:49:57 EDT 2011