batgrbproduct Analysis for Trigger=325899
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): Wed Jul 27 11:18:48 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger325899/SDC
======================================================================
Trigger: 00325899 Segment: 000
BAT Trigger Time: 244048520 [s; MET]
Trigger Stop: 244048584 [s; MET]
UTC: 2008-09-25T15:15:16.874440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 299.58765322683 Dec: 35.2025418205581 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 19.88
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 19.88
Flight Position: [ source = BAT ]
RA: 299.58765322683 Dec: 35.2025418205581 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 299.685601421662 Dec: 35.0491540127473 [deg; J2000]
{ 19h 58m 44.5s , +35d 02' 57.0" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 4.34452595913765 [arcmin] (formal 1-sigma fit error)
SNR: -1.89630983584162
Angular difference between Flight and Ground position is 10.382872 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 545.472000002861 +/- 347.686036197844
Measured from: 155.432000011206
to: 700.904000014067 [s; relative to TRIGTIME]
T50: 125.631999999285 +/- 131.532772124746
Measured from: 210.536000013351
to: 336.168000012636 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 153.363999992609
to: 154.363999992609 [s; relative to TRIGTIME]
Total Fluence
Measured from: 153.511999994516
to: 926.247999995947 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 7.093630 7.959919 4.964121 0.872702
0.132277 0.131637 0.121367 0.120757 [error]
Peak 0.021081 0.030148 0.016122 0.007277
0.005298 0.005377 0.004972 0.004933 [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 2.12e-06 3.27e-06 3.77e-06 8.37e-06 1.16e-05 1.75e-05 erg/cm2
Error 1.02e-07 8.64e-08 1.31e-07 6.62e-07 3.01e-07 7.38e-07 erg/cm2
Peak flux Power-law 1.65e-01 1.82e-01 1.43e-01 1.84e-01 5.58e-01 6.74e-01 ph/cm2/s
Error 6.23e-02 4.26e-02 4.04e-02 1.10e-01 1.23e-01 1.59e-01 ph/cm2/s
Fluence Cutoff-PL 1.97e-06 3.33e-06 3.82e-06 5.15e-06 1.13e-05 1.43e-05 erg/cm2
Error 1.34e-07 9.57e-08 1.38e-07 1.46e-06 3.77e-07 1.53e-06 erg/cm2
Peak flux Cutoff-PL 1.63e-01 1.85e-01 1.43e-01 1.53e-01 5.56e-01 6.43e-01 ph/cm2/s
Error 6.55e-02 5.55e-02 4.59e-02 1.59e-01 1.28e-01 2.01e-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 1.791 0.051 - - 1.93e-03 4.87e-05 39.880 57
CPL 1.446 0.215 81.2 30.1 2.83e-03 6.74e-04 31.780 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.351 0.391 - - 4.63e-03 1.05e-03 45.130 57
CPL 1.221 2.232 254.9 0.0 5.50e-03 9.95e-02 45.110 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 772.736 153.512 926.248
T90 545.472 155.432 700.904
T50 125.632 210.536 336.168
Peak 1.000 153.364 154.364
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
299.6856 +35.0492 0.1016 14.2 -14.6 -1.0289 -1.9 TRIG_00325899
------------------------------------------
Foreground time interval of the image:
153.512 760.001 (delta_t = 606.489 [sec])
Background time interval of the image:
-7.099 85.883 (delta_t = 92.982 [sec])
87.000 153.512 (delta_t = 66.512 [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
153.512000 783.047200
901.000000 926.248000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79137 ( -0.0507372 0.0510085 )
Norm@50keV : 1.93003E-03 ( -4.87269e-05 4.86419e-05 )
------------------------------------------------------------
# Chi-Squared = 39.88 using 59 PHA bins.
# Reduced chi-squared = 0.6996 for 57 degrees of freedom
# Null hypothesis probability = 9.587094e-01
Photon flux (15-150 keV) in 654.8 sec: 0.265069 ( -0.00726051 0.0072943 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16382e-05 ( -3.00258e-07 3.00943e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
153.512000 783.047200
901.000000 926.248000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44579 ( -0.220454 0.209934 )
Epeak [keV] : 81.1745 ( -13.9032 46.2563 )
Norm@50keV : 2.83477E-03 ( -0.000576907 0.0007705 )
------------------------------------------------------------
# Chi-Squared = 31.78 using 59 PHA bins.
# Reduced chi-squared = 0.5674 for 56 degrees of freedom
# Null hypothesis probability = 9.962569e-01
Photon flux (15-150 keV) in 654.8 sec: 0.256611 ( -0.008679 0.008735 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12542e-05 ( -3.76968e-07 3.76968e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
153.512000 783.047200
901.000000 926.248000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.42767 ( -0.256638 0.181433 )
beta : 10.00000 ( -1.97895e+15 -1.97895e+15 )
Epeak [keV] : 4.18766 ( )
Norm@50keV : 9.60264E-20 ( )
------------------------------------------------------------
# Chi-Squared = 1134.74 using 59 PHA bins.
# Reduced chi-squared = 20.6317 for 55 degrees of freedom
# Null hypothesis probability = 1.872175e-201
Photon flux (15-150 keV) in 654.8 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] : 13.6139 ( )
R^2/D10^2 : 3.71744E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 311.64 using 59 PHA bins.
# Reduced chi-squared = 5.4674 for 57 degrees of freedom
# Null hypothesis probability = 8.918244e-37
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.551e-07 4.976e-08
25- 50 3.453e-06 9.855e-08
50-150 4.153e-06 2.141e-07
15-150 8.561e-06 2.357e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 114.995 (2.8831 29.2637)
Norm : 1.10518 (-0.041584 0.0443382)
------------------------------------------------------------
# Chi-Squared = 33.24 using 59 PHA bins.
# Reduced chi-squared = 0.5832 for 57 degrees of freedom
# Null hypothesis probability = 9.950152e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.888e-06 7.366e-08
25- 50 3.352e-06 9.003e-08
50-150 5.856e-06 5.684e-07
15-150 1.110e-05 5.959e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.48535 (-0.676462 0.721615)
R1^2/D10^2 : 0.373608 (-0.117022 0.194405)
kT2 [keV] : 22.0393 (-1.89688 2.41969)
R2^2/D10^2 : 4.95389E-03 (-0.00166756 0.00215447)
------------------------------------------------------------
# Chi-Squared = 39.91 using 59 PHA bins.
# Reduced chi-squared = 0.7256 for 55 degrees of freedom
# Null hypothesis probability = 9.372079e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.808e-06 1.680e-07
25- 50 3.325e-06 2.164e-07
50-150 5.820e-06 4.947e-07
15-150 1.095e-05 5.893e-07
Peak spectrum fit
Power-law model
Time interval is from 153.364 sec. to 154.364 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35118 ( -0.395557 0.386701 )
Norm@50keV : 4.63440E-03 ( -0.00105223 0.00103925 )
------------------------------------------------------------
# Chi-Squared = 45.13 using 59 PHA bins.
# Reduced chi-squared = 0.7917 for 57 degrees of freedom
# Null hypothesis probability = 8.721622e-01
Photon flux (15-150 keV) in 1 sec: 0.558447 ( -0.122619 0.122719 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.52507e-08 ( -1.14938e-08 1.19462e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 153.364 sec. to 154.364 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22056 ( -2.61427 1.84951 )
Epeak [keV] : 254.926 ( -285.472 -285.472 )
Norm@50keV : 5.49764E-03 ( -0.0017963 0.197197 )
------------------------------------------------------------
# Chi-Squared = 45.11 using 59 PHA bins.
# Reduced chi-squared = 0.8056 for 56 degrees of freedom
# Null hypothesis probability = 8.508642e-01
Photon flux (15-150 keV) in 1 sec: 0.555548 ( -0.130166 0.124883 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.44775e-08 ( -1.64991e-08 1.28934e-08 ) ergs/cm2
Band function
Time interval is from 153.364 sec. to 154.364 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.51226 ( -7.07665 -7.07665 )
beta : -1.87046 ( -1.34203 0.645629 )
Epeak [keV] : 36.0636 ( -34.4422 9.40257 )
Norm@50keV : 7.21601 ( -6.57669 31.8587 )
------------------------------------------------------------
# Chi-Squared = 43.03 using 59 PHA bins.
# Reduced chi-squared = 0.7823 for 55 degrees of freedom
# Null hypothesis probability = 8.794029e-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] : 12.1224 (-2.73056 4.4913)
R^2/D10^2 : 0.134575 (-0.0906782 0.203428)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 48.16 using 59 PHA bins.
# Reduced chi-squared = 0.8449 for 57 degrees of freedom
# Null hypothesis probability = 7.914964e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.186e-09 1.828e-09
25- 50 1.333e-08 5.128e-09
50-150 1.186e-08 6.538e-09
15-150 2.938e-08 1.199e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.361 (-108.662 -199.837)
Norm : 2.28221 (-0.500195 0.500852)
------------------------------------------------------------
# Chi-Squared = 45.59 using 59 PHA bins.
# Reduced chi-squared = 0.7998 for 57 degrees of freedom
# Null hypothesis probability = 8.613519e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.683e-09 3.183e-09
25- 50 1.093e-08 6.265e-09
50-150 2.398e-08 1.367e-08
15-150 4.059e-08 2.331e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.60843 (-2.34434 2.96027)
R1^2/D10^2 : 0.264514 ( )
kT2 [keV] : 199.332 (-198.463 -198.463)
R2^2/D10^2 : 9.26745E-05 (-4.93078e-05 0.00534061)
------------------------------------------------------------
# Chi-Squared = 40.91 using 59 PHA bins.
# Chi-Squared = 40.79 using 59 PHA bins.
# Reduced chi-squared = 0.7438 for 55 degrees of freedom
# Reduced chi-squared = 0.7416 for 55 degrees of freedom
# Null hypothesis probability = 9.213792e-01
# Null hypothesis probability = 9.234106e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.085e-09 3.140e-09
25- 50 1.237e-08 7.705e-09
50-150 3.024e-08 3.795e-08
15-150 4.770e-08 4.646e-08
Plot creation:
Wed Jul 27 11:51:46 EDT 2011