batgrbproduct Analysis for Trigger=321750
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 11:54:52 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger321750/SDC
======================================================================
Trigger: 00321750 Segment: 000
BAT Trigger Time: 241267712 [s; MET]
Trigger Stop: 241267824 [s; MET]
UTC: 2008-08-24T10:48:28.956600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 282.088639951228 Dec: -3.19731935616618 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 11.48
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 11.48
Flight Position: [ source = BAT ]
RA: 282.088639951228 Dec: -3.19731935616618 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 282.053430650073 Dec: -3.24615273973677 [deg; J2000]
{ 18h 48m 12.8s , -03d 14' 46.1" }
+/- 2.7227907139332 [arcmin] (estimated 90% radius based on SNR)
+/- 1.7332768325809 [arcmin] (formal 1-sigma fit error)
SNR: 7.27226064476345
Angular difference between Flight and Ground position is 3.610225 arcmin
Partial Coding Fraction: 0.953125 [ including projection effects ]
Duration
T90: 479.876000016928 +/- 58.0355274795638
Measured from: -7.48800000548363
to: 472.388000011444 [s; relative to TRIGTIME]
T50: 173.351999998093 +/- 43.0296597616483
Measured from: 165.136000007391
to: 338.488000005484 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 430.083999991417
to: 431.083999991417 [s; relative to TRIGTIME]
Total Fluence
Measured from: -54.8519999980927
to: 505.511999994516 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.863245 2.218481 0.531254 0.065735
0.138779 0.132587 0.114393 0.098337 [error]
Peak 0.017757 0.011129 0.014965 0.009764
0.005762 0.005443 0.004679 0.004031 [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 9.28e-07 8.54e-07 5.43e-07 5.31e-07 2.55e-06 2.86e-06 erg/cm2
Error 8.78e-08 6.95e-08 9.24e-08 1.69e-07 2.16e-07 3.04e-07 erg/cm2
Peak flux Power-law 1.07e-01 1.19e-01 9.42e-02 1.24e-01 3.65e-01 4.43e-01 ph/cm2/s
Error 7.15e-02 4.76e-02 3.94e-02 1.25e-01 1.28e-01 1.56e-01 ph/cm2/s
Fluence Cutoff-PL 8.74e-07 9.45e-07 3.82e-07 4.59e-08 2.24e-06 2.25e-06 erg/cm2
Error 9.80e-08 9.17e-08 1.43e-07 1.02e-07 2.47e-07 2.71e-07 erg/cm2
Peak flux Cutoff-PL 1.08e-01 1.19e-01 9.38e-02 1.22e-01 3.66e-01 4.41e-01 ph/cm2/s
Error 7.55e-02 4.75e-02 2.95e-02 1.52e-01 1.26e-01 1.57e-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 2.652 0.168 - - 4.34e-04 5.36e-05 63.270 57
CPL 1.252 0.981 17.9 0.0 3.51e-03 0.00e+00 55.780 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.333 0.707 - - 3.04e-03 1.03e-03 60.700 57
CPL 1.351 0.741 9999.4 0.0 3.03e-03 8.04e-03 60.710 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 560.364 -54.852 505.512
T90 479.876 -7.488 472.388
T50 173.352 165.136 338.488
Peak 1.000 430.084 431.084
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
282.0534 -3.2462 0.0265 19.2 171.4 3.1429 7.3 TRIG_00321750
------------------------------------------
Foreground time interval of the image:
-54.852 449.301 (delta_t = 504.153 [sec])
Background time interval of the image:
-239.000 -54.852 (delta_t = 184.148 [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 -54.852 sec. to 505.512 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.65203 ( -0.163857 0.172874 )
Norm@50keV : 4.34214E-04 ( -5.35481e-05 5.36563e-05 )
------------------------------------------------------------
# Chi-Squared = 63.27 using 59 PHA bins.
# Reduced chi-squared = 1.110 for 57 degrees of freedom
# Null hypothesis probability = 2.648189e-01
Photon flux (15-150 keV) in 560.4 sec: 9.39038E-02 ( -0.00681721 0.00682154 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.54673e-06 ( -2.13879e-07 2.18555e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -54.852 sec. to 505.512 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25231 ( -1.21823 0.743462 )
Epeak [keV] : 17.9022 ( )
Norm@50keV : 3.50858E-03 ( )
------------------------------------------------------------
# Chi-Squared = 55.78 using 59 PHA bins.
# Reduced chi-squared = 0.9961 for 56 degrees of freedom
# Null hypothesis probability = 4.831799e-01
Photon flux (15-150 keV) in 560.4 sec: 8.91109E-02 ( -0.0073597 0.0073838 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.24167e-06 ( -2.29708e-07 2.63579e-07 ) ergs/cm2
Band function
Time interval is from -54.852 sec. to 505.512 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.731084 ( -1.67454 1.84233 )
beta : -3.48299 ( 3.4436 0.612552 )
Epeak [keV] : 21.0343 ( -8.90215 4.165 )
Norm@50keV : 8.17332E-03 ( -0.00790305 0.269773 )
------------------------------------------------------------
# Chi-Squared = 54.70 using 59 PHA bins.
# Reduced chi-squared = 0.9946 for 55 degrees of freedom
# Null hypothesis probability = 4.859340e-01
Photon flux (15-150 keV) in 560.4 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] : 6.88869 (-0.515948 0.556244)
R^2/D10^2 : 0.181367 (-0.0520157 0.0739784)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 67.84 using 59 PHA bins.
# Reduced chi-squared = 1.190 for 57 degrees of freedom
# Null hypothesis probability = 1.541299e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.618e-07 8.770e-08
25- 50 1.011e-06 9.919e-08
50-150 1.581e-07 4.539e-08
15-150 1.931e-06 1.664e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 26.7739 (-4.14267 5.18035)
Norm : 0.820017 (-0.135432 0.168815)
------------------------------------------------------------
# Chi-Squared = 55.79 using 59 PHA bins.
# Reduced chi-squared = 0.9787 for 57 degrees of freedom
# Null hypothesis probability = 5.207182e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.783e-07 8.014e-08
25- 50 9.396e-07 7.986e-08
50-150 4.408e-07 1.253e-07
15-150 2.259e-06 2.026e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 16.2531 ( )
R1^2/D10^2 : 1.93868E-03 (-0.00182585 0.126165)
kT2 [keV] : 5.66363 (-3.7338 0.972375)
R2^2/D10^2 : 0.355833 (-0.15626 49.8138)
------------------------------------------------------------
# Chi-Squared = 57.50 using 59 PHA bins.
# Chi-Squared = 56.92 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 55 degrees of freedom
# Reduced chi-squared = 1.035 for 55 degrees of freedom
# Null hypothesis probability = 3.826630e-01
# Null hypothesis probability = 4.033440e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.645e-07 4.517e-07
25- 50 9.438e-07 4.772e-07
50-150 3.630e-07 2.077e-07
15-150 2.171e-06 1.077e-06
Peak spectrum fit
Power-law model
Time interval is from 430.084 sec. to 431.084 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33336 ( -0.737319 0.676722 )
Norm@50keV : 3.04412E-03 ( -0.00103462 0.00102533 )
------------------------------------------------------------
# Chi-Squared = 60.70 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 57 degrees of freedom
# Null hypothesis probability = 3.439641e-01
Photon flux (15-150 keV) in 1 sec: 0.365492 ( -0.127554 0.128158 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.98448e-08 ( -1.11941e-08 1.15472e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 430.084 sec. to 431.084 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35102 ( -0.918399 0.562616 )
Epeak [keV] : 9999.36 ( -10000 -10000 )
Norm@50keV : 3.02932E-03 ( -0.00103774 0.015051 )
------------------------------------------------------------
# Chi-Squared = 60.71 using 59 PHA bins.
# Reduced chi-squared = 1.084 for 56 degrees of freedom
# Null hypothesis probability = 3.100068e-01
Photon flux (15-150 keV) in 1 sec: 0.366268 ( -0.128276 0.123 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.97092e-08 ( -1.10731e-08 1.16845e-08 ) ergs/cm2
Band function
Time interval is from 430.084 sec. to 431.084 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99999 ( -137189 -137189 )
beta : -1.46980 ( -1.03335 0.821276 )
Epeak [keV] : 25.9099 ( -25.7688 14.3832 )
Norm@50keV : 235.617 ( -244.383 2.52731e+06 )
------------------------------------------------------------
# Chi-Squared = 60.40 using 59 PHA bins.
# Reduced chi-squared = 1.098 for 55 degrees of freedom
# Null hypothesis probability = 2.870285e-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] : 19.8810 (-10.6906 27.123)
R^2/D10^2 : 1.53357E-02 (-0.0148905 0.193623)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 65.25 using 59 PHA bins.
# Reduced chi-squared = 1.145 for 57 degrees of freedom
# Null hypothesis probability = 2.118421e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.171e-09 7.920e-10
25- 50 5.811e-09 3.641e-09
50-150 1.701e-08 1.166e-08
15-150 2.400e-08 1.544e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.999 -199.999)
Norm : 1.50667 (-0.513194 0.513194)
------------------------------------------------------------
# Chi-Squared = 61.38 using 59 PHA bins.
# Reduced chi-squared = 1.077 for 57 degrees of freedom
# Null hypothesis probability = 3.219023e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.752e-09 2.294e-09
25- 50 7.217e-09 4.310e-09
50-150 1.583e-08 9.255e-09
15-150 2.680e-08 1.605e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.95578 (-2.46893 6.1125)
R1^2/D10^2 : 0.877228 (-0.802408 2.0326)
kT2 [keV] : 45.4937 (-45.4237 -45.424)
R2^2/D10^2 : 1.17418E-03 (-0.00113481 0.0146701)
------------------------------------------------------------
# Chi-Squared = 59.16 using 59 PHA bins.
# Reduced chi-squared = 1.076 for 55 degrees of freedom
# Null hypothesis probability = 3.264143e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.376e-09 2.683e-09
25- 50 6.029e-09 3.733e-09
50-150 2.270e-08 1.386e-08
15-150 3.311e-08 1.651e-08
Plot creation:
Thu Jul 28 12:56:07 EDT 2011