batgrbproduct Analysis for Trigger=338177
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 page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.42
Process Start Time (local time): Fri Dec 26 04:28:53 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger338177/GCN5_download_cron
======================================================================
Trigger: 00338177 Segment: 000
BAT Trigger Time: 251946220.736 [s; MET]
Trigger Stop: 251946220.992 [s; MET]
UTC: 2008-12-26T01:03:37.372040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 120.526759597338 Dec: -69.0057732552917 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.6
Image Trigger?: NO
Rate S/N Ratio: 19.9749843554382 [ if not an image trigger ]
Image S/N Ratio: 7.6
Flight Position: [ source = BAT ]
RA: 120.526759597338 Dec: -69.0057732552917 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 120.477670907548 Dec: -69.0135109950221 [deg; J2000]
{ 08h 01m 54.6s , -69d 00' 48.6" }
+/- 2.08970314117404 [arcmin] (estimated 90% radius based on SNR)
+/- 1.09938816140727 [arcmin] (formal 1-sigma fit error)
SNR: 10.6134034155826
Angular difference between Flight and Ground position is 1.152677 arcmin
Partial Coding Fraction: 0.328125 [ including projection effects ]
Duration
T90: 0.444000005722046 +/- 0.098792724251903
Measured from: -0.0279999077320099
to: 0.416000097990036 [s; relative to TRIGTIME]
T50: 0.196000009775162 +/- 0.0948261490152567
Measured from: 0.0440000891685486
to: 0.24000009894371 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.303999990224838
to: 0.696000009775162 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0600000023841858
to: 0.451999992132187 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.034152 0.040343 0.047007 0.032461
0.007448 0.007886 0.007626 0.006461 [error]
Peak 0.034152 0.040343 0.047007 0.032461
0.007448 0.007886 0.007626 0.006461 [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 1.13e-08 2.27e-08 3.54e-08 1.22e-07 9.88e-08 1.92e-07 erg/cm2
Error 3.50e-09 4.27e-09 7.15e-09 5.45e-08 1.79e-08 5.83e-08 erg/cm2
Peak flux Power-law 7.10e-01 7.78e-01 6.07e-01 7.80e-01 2.39e+00 2.87e+00 ph/cm2/s
Error 2.23e-01 1.51e-01 1.19e-01 3.20e-01 4.19e-01 4.88e-01 ph/cm2/s
Fluence Cutoff-PL 1.08e-08 2.31e-08 3.60e-08 9.52e-08 9.80e-08 1.62e-07 erg/cm2
Error 4.10e-09 4.80e-09 8.17e-09 9.11e-08 1.84e-08 7.91e-08 erg/cm2
Peak flux Cutoff-PL 6.83e-01 7.88e-01 6.20e-01 6.56e-01 2.37e+00 2.75e+00 ph/cm2/s
Error 2.63e-01 1.65e-01 1.40e-01 4.53e-01 4.26e-01 6.34e-01 ph/cm2/s
Fluence Band 1.07e-08 2.30e-08 3.62e-08 9.65e-08 9.81e-08 1.53e-07 erg/cm2
Error 4.06e-09 5.53e-09 8.23e-09 9.11e-08 1.84e-08 0.00e+00 erg/cm2
Peak flux Band 7.01e-01 7.81e-01 6.07e-01 7.74e-01 2.38e+00 2.87e+00 ph/cm2/s
Error 3.02e-01 1.74e-01 1.19e-01 5.65e-01 4.32e-01 6.32e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.357 0.291 - - 1.98e-02 3.31e-03 55.351 57
CPL 1.163 1.516 235.4 5000.0 2.44e-02 3.82e-02 55.285 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.357 0.291 - - 1.98e-02 3.31e-03 55.351 57
CPL 1.163 1.516 235.4 5000.0 2.44e-02 3.82e-02 55.285 0
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: 0.256000 sec.
T50 in the 50-300 keV band: 0.192000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.512 -0.060 0.452
T90 0.444 -0.028 0.416
T50 0.196 0.044 0.240
Peak 1.000 -0.304 0.696
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
120.4777 -69.0135 0.0181 47.3 -159.1 0.1648 10.6 TRIG_00338177
------------------------------------------
Foreground time interval of the image:
-0.060 0.452 (delta_t = 0.512 [sec])
Background time interval of the image:
-239.736 -0.060 (delta_t = 239.676 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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 -0.060 sec. to 0.452 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35667 ( -0.291516 0.290545 )
Norm@50keV : 1.977848E-02 ( -3.312424E-03 3.309917E-03) )
------------------------------------------------------------
Chi-Squared = 55.35142 using 59 PHA bins.
Reduced chi-squared = 0.9710775 for 57 degrees of freedom
Null hypothesis probability = 0.537
Photon flux (15-150 keV) in 0.5120 sec: 2.38602 ( -0.41813 0.4205 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.88145e-08 ( -1.78836e-08 1.78831e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.060 sec. to 0.452 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16328 ( -1.29486 1.73722 )
Epeak [keV] : 235.411 ( -235.401 9764.59 )
Norm@50keV : 2.435962E-02 ( -7.789647E-03 6.851872E-02) )
------------------------------------------------------------
Chi-Squared = 55.28542 using 59 PHA bins.
but latest trial 2.90006 gives Chi-Squared = 1.61737
Reduced chi-squared = 0.9872397 for 56 degrees of freedom
Null hypothesis probability = 0.502
Photon flux (15-150 keV) in 0.5120 sec: 2.37038 ( -0.43042 0.42183 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.79871e-08 ( -1.8388e-08 1.84443e-08 ) ergs/cm2
Band function
Time interval is from -0.060 sec. to 0.452 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.976446 ( -9.02355 5.84738 )
beta : -1.36247 ( -8.63753 0.295944 )
Epeak [keV] : 66.9610 ( -66.8610 9931.06 )
Norm@50keV : 3.796036E-02 ( -3.796036E-02 8213.96 )
------------------------------------------------------------
Chi-Squared = 55.32833 using 59 PHA bins.
Reduced chi-squared = 1.005970 for 55 degrees of freedom
Null hypothesis probability = 0.462
Photon flux (15-150 keV) in 0.5120 sec: 2.38231 ( -0.45179 0.41205 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.81309e-08 ( -1.86092e-08 1.82886e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.0561 -3.4661 4.586
R^2/D10^2 : 0.149520 -0.0807591 0.160926
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Chi-Squared = 63.10430 using 59 PHA bins.
Reduced chi-squared = 1.107093 for 57 degrees of freedom
Null hypothesis probability = 0.269
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.992e-09 1.594e-09
25- 50 2.314e-08 6.936e-09
50-150 5.481e-08 1.725e-08
15-150 8.294e-08 2.183e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363
Norm : 9.97084 -9.97084 1e+24
------------------------------------------------------------
Chi-Squared = 56.87728 using 59 PHA bins.
Reduced chi-squared = 0.9978470 for 57 degrees of freedom
Null hypothesis probability = 0.480
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.271e-08 5.486e-09
25- 50 2.445e-08 1.284e-08
50-150 5.368e-08 2.735e-08
15-150 9.083e-08 4.615e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.19629 -2.44632 8.22271
R1^2/D10^2 : 6.34780 -6.02077 120.021
kT2 [keV] : 24.2928 -6.4596 61.2932
R2^2/D10^2 : 4.832027E-02 -0.0472207 1e+24
------------------------------------------------------------
Chi-Squared = 55.52984 using 59 PHA bins.
but latest trial 115.694 gives Chi-Squared = 3.07764
but latest trial 1.099616E-03 gives Chi-Squared = 17.5929
Reduced chi-squared = 1.009633 for 55 degrees of freedom
Null hypothesis probability = 0.455
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.177e-08 5.814e-09
25- 50 2.099e-08 6.866e-09
50-150 6.352e-08 3.167e-08
15-150 9.628e-08 3.896e-08
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.060 sec. to 0.452 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35667 ( -0.291516 0.290545 )
Norm@50keV : 1.977848E-02 ( -3.312424E-03 3.309917E-03) )
------------------------------------------------------------
Chi-Squared = 55.35142 using 59 PHA bins.
Reduced chi-squared = 0.9710775 for 57 degrees of freedom
Null hypothesis probability = 0.537
Photon flux (15-150 keV) in 0.5120 sec: 2.38602 ( -0.41813 0.4205 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.88145e-08 ( -1.78836e-08 1.78831e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.060 sec. to 0.452 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16328 ( -1.29486 1.73722 )
Epeak [keV] : 235.411 ( -235.401 9764.59 )
Norm@50keV : 2.435962E-02 ( -7.789647E-03 6.851872E-02) )
------------------------------------------------------------
Chi-Squared = 55.28542 using 59 PHA bins.
but latest trial 2.90006 gives Chi-Squared = 1.61737
Reduced chi-squared = 0.9872397 for 56 degrees of freedom
Null hypothesis probability = 0.502
Photon flux (15-150 keV) in 0.5120 sec: 2.37038 ( -0.43042 0.42183 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.79871e-08 ( -1.8388e-08 1.84443e-08 ) ergs/cm2
Band function
Time interval is from -0.060 sec. to 0.452 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.976446 ( -9.02355 5.84738 )
beta : -1.36247 ( -8.63753 0.295944 )
Epeak [keV] : 66.9610 ( -66.8610 9931.06 )
Norm@50keV : 3.796036E-02 ( -3.796036E-02 8213.96 )
------------------------------------------------------------
Chi-Squared = 55.32833 using 59 PHA bins.
Reduced chi-squared = 1.005970 for 55 degrees of freedom
Null hypothesis probability = 0.462
Photon flux (15-150 keV) in 0.5120 sec: 2.38231 ( -0.45179 0.41205 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.81309e-08 ( -1.86092e-08 1.82886e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.0561 -3.4661 4.586
R^2/D10^2 : 0.149520 -0.0807591 0.160926
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Chi-Squared = 63.10430 using 59 PHA bins.
Reduced chi-squared = 1.107093 for 57 degrees of freedom
Null hypothesis probability = 0.269
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.992e-09 1.757e-09
25- 50 2.314e-08 6.581e-09
50-150 5.481e-08 1.850e-08
15-150 8.294e-08 2.103e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363
Norm : 9.97084 -9.97084 1e+24
------------------------------------------------------------
Chi-Squared = 56.87728 using 59 PHA bins.
Reduced chi-squared = 0.9978470 for 57 degrees of freedom
Null hypothesis probability = 0.480
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.271e-08 6.857e-09
25- 50 2.445e-08 1.344e-08
50-150 5.368e-08 2.764e-08
15-150 9.083e-08 4.593e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.19629 -2.44632 8.22271
R1^2/D10^2 : 6.34780 -6.02077 120.021
kT2 [keV] : 24.2928 -6.4596 61.2932
R2^2/D10^2 : 4.832027E-02 -0.0472207 1e+24
------------------------------------------------------------
Chi-Squared = 55.52984 using 59 PHA bins.
but latest trial 115.694 gives Chi-Squared = 3.07764
but latest trial 1.099616E-03 gives Chi-Squared = 17.5929
Reduced chi-squared = 1.009633 for 55 degrees of freedom
Null hypothesis probability = 0.455
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.177e-08 5.526e-09
25- 50 2.099e-08 6.781e-09
50-150 6.352e-08 3.097e-08
15-150 9.628e-08 3.539e-08
Plot creation:
Fri Dec 26 04:53:51 EST 2008