batgrbproduct Analysis for Trigger=340986
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): Sat Jan 24 08:46:43 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger340986/GCN5_download_cron
======================================================================
Trigger: 00340986 Segment: 000
BAT Trigger Time: 254463086.656 [s; MET]
Trigger Stop: 254463086.688 [s; MET]
UTC: 2009-01-24T04:11:22.214780 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 237.697582708386 Dec: -54.316459849281 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.83
Image Trigger?: NO
Rate S/N Ratio: 54.5343928177439 [ if not an image trigger ]
Image S/N Ratio: 14.83
Flight Position: [ source = BAT ]
RA: 237.697582708386 Dec: -54.316459849281 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 237.731679923622 Dec: -54.3190847622001 [deg; J2000]
{ 15h 50m 55.6s , -54d 19' 08.7" }
+/- 1.14402406195708 [arcmin] (estimated 90% radius based on SNR)
+/- 0.410295110376255 [arcmin] (formal 1-sigma fit error)
SNR: 25.0980269600913
Angular difference between Flight and Ground position is 1.203661 arcmin
Partial Coding Fraction: 0.3984375 [ including projection effects ]
Duration
T90: 0.57600000500679 +/- 0.016970554993457
Measured from: -0.0119999051094055
to: 0.564000099897385 [s; relative to TRIGTIME]
T50: 0.448000013828278 +/- 0.048662105768992
Measured from: 0.0200001001358032
to: 0.468000113964081 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.217999994754791
to: 0.782000005245209 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0239999890327454
to: 0.584000021219254 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.153403 0.195416 0.105942 0.010242
0.010261 0.010554 0.008987 0.005274 [error]
Peak 0.153764 0.196085 0.106196 0.009918
0.010293 0.010618 0.009020 0.005290 [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 5.63e-08 7.68e-08 7.72e-08 1.41e-07 2.56e-07 3.92e-07 erg/cm2
Error 5.51e-09 5.24e-09 8.02e-09 2.85e-08 1.94e-08 0.00e+00 erg/cm2
Peak flux Power-law 3.02e+00 2.27e+00 1.14e+00 8.20e-01 6.81e+00 7.25e+00 ph/cm2/s
Error 3.01e-01 1.56e-01 1.15e-01 1.54e-01 4.74e-01 4.95e-01 ph/cm2/s
Fluence Cutoff-PL 4.68e-08 8.99e-08 8.05e-08 2.90e-08 2.39e-07 2.92e-07 erg/cm2
Error 6.54e-09 7.30e-09 9.90e-09 1.73e-08 2.02e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.45e+00 2.63e+00 1.23e+00 2.28e-01 6.50e+00 6.53e+00 ph/cm2/s
Error 3.60e-01 2.09e-01 1.42e-01 1.19e-01 4.87e-01 5.02e-01 ph/cm2/s
Fluence Band 4.65e-08 8.95e-08 8.04e-08 2.91e-08 2.39e-07 2.69e-07 erg/cm2
Error 5.37e-09 5.16e-09 7.44e-09 2.72e-08 1.32e-08 0.00e+00 erg/cm2
Peak flux Band 2.45e+00 2.62e+00 1.22e+00 2.30e-01 6.48e+00 6.53e+00 ph/cm2/s
Error 2.49e-01 1.83e-01 9.49e-02 1.55e-01 4.58e-01 4.98e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.990 0.115 - - 4.56e-02 3.57e-03 95.354 57
CPL 0.562 0.603 46.4 5.5 2.68e-01 2.28e-01 73.400 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.993 0.115 - - 4.55e-02 3.57e-03 92.289 57
CPL 0.548 0.606 46.4 5.4 2.72e-01 2.32e-01 69.991 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: 0.576000 sec.
T50 in the 50-300 keV band: 0.448000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.608 -0.024 0.584
T90 0.576 -0.012 0.564
T50 0.448 0.020 0.468
Peak 1.000 -0.218 0.782
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
237.7317 -54.3191 0.0076 34.7 -120.1 0.4862 25.1 TRIG_00340986
------------------------------------------
Foreground time interval of the image:
-0.024 0.584 (delta_t = 0.608 [sec])
Background time interval of the image:
-119.656 -0.024 (delta_t = 119.632 [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 -0.024 sec. to 0.584 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99039 ( -0.112880 0.117115 )
Norm@50keV : 4.564495E-02 ( -3.592037E-03 3.556579E-03) )
------------------------------------------------------------
Chi-Squared = 95.35365 using 59 PHA bins.
Reduced chi-squared = 1.672871 for 57 degrees of freedom
Null hypothesis probability = 1.093E-03
Photon flux (15-150 keV) in 0.6080 sec: 6.81663 ( -0.47447 0.47489 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.55787e-07 ( -1.92852e-08 1.94402e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.024 sec. to 0.584 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.561709 ( -0.641738 0.564732 )
Epeak [keV] : 46.4266 ( -5.11976 5.90300 )
Norm@50keV : 0.267528 ( -0.133080 0.323310 )
------------------------------------------------------------
Chi-Squared = 73.40036 using 59 PHA bins.
Reduced chi-squared = 1.310721 for 56 degrees of freedom
Null hypothesis probability = 5.927E-02
Photon flux (15-150 keV) in 0.6080 sec: 6.50482 ( -0.48612 0.48789 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.39151e-07 ( -2.00409e-08 2.02902e-08 ) ergs/cm2
Band function
Time interval is from -0.024 sec. to 0.584 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.572415 ( -0.553851 0.649811 )
beta : -9.27882 ( -0.721176 6.62214 )
Epeak [keV] : 46.4197 ( -5.05099 5.89746 )
Norm@50keV : 0.264135 ( -0.129643 0.240844 )
------------------------------------------------------------
Chi-Squared = 73.40163 using 59 PHA bins.
Reduced chi-squared = 1.334575 for 55 degrees of freedom
Null hypothesis probability = 4.927E-02
Photon flux (15-150 keV) in 0.6080 sec: 6.50474 ( -0.48596 0.4795 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.39075e-07 ( -1.60074e-08 1.04868e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.5123 -0.8179 0.865
R^2/D10^2 : 1.95181 -0.4702 0.62472
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Chi-Squared = 95.39524 using 59 PHA bins.
Reduced chi-squared = 1.673601 for 57 degrees of freedom
Null hypothesis probability = 1.083E-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.311e-08 4.225e-09
25- 50 9.915e-08 7.442e-09
50-150 7.677e-08 1.297e-08
15-150 2.090e-07 1.771e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 71.7160 -12.0974 15.9717
Norm : 33.6782 -3.3801 3.7539
------------------------------------------------------------
Chi-Squared = 78.39876 using 59 PHA bins.
Reduced chi-squared = 1.375417 for 57 degrees of freedom
Null hypothesis probability = 3.159E-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.266e-08 5.153e-09
25- 50 8.434e-08 5.685e-09
50-150 1.103e-07 1.846e-08
15-150 2.473e-07 2.046e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.26657 -1.60973 2.04822
R1^2/D10^2 : 17.3405 -11.2554 36.7364
kT2 [keV] : 15.0067 -2.0073 3.4457
R2^2/D10^2 : 0.565904 -0.363141 1e+24
------------------------------------------------------------
Chi-Squared = 72.88322 using 59 PHA bins.
but latest trial 76.0622 gives Chi-Squared = 288.121
Reduced chi-squared = 1.325149 for 55 degrees of freedom
Null hypothesis probability = 5.359E-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.764e-08 1.462e-08
25- 50 8.776e-08 1.784e-08
50-150 1.001e-07 2.557e-08
15-150 2.355e-07 4.909e-08
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.024 sec. to 0.588 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99288 ( -0.112745 0.117203 )
Norm@50keV : 4.554218E-02 ( -3.588319E-03 3.549915E-03) )
------------------------------------------------------------
Chi-Squared = 92.28859 using 59 PHA bins.
Reduced chi-squared = 1.619098 for 57 degrees of freedom
Null hypothesis probability = 2.141E-03
Photon flux (15-150 keV) in 0.6120 sec: 6.80909 ( -0.47409 0.47459 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.56906e-07 ( -1.93661e-08 1.95638e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.024 sec. to 0.588 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.548202 ( -0.644343 0.567005 )
Epeak [keV] : 46.4088 ( -5.07922 5.82030 )
Norm@50keV : 0.271780 ( -0.135457 0.329525 )
------------------------------------------------------------
Chi-Squared = 69.99126 using 59 PHA bins.
Reduced chi-squared = 1.249844 for 56 degrees of freedom
Null hypothesis probability = 9.896E-02
Photon flux (15-150 keV) in 0.6120 sec: 6.49522 ( -0.486 0.48754 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.4028e-07 ( -2.00399e-08 2.03857e-08 ) ergs/cm2
Band function
Time interval is from -0.024 sec. to 0.588 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.551295 ( -0.563633 0.645442 )
beta : -9.16920 ( )
Epeak [keV] : 46.3833 ( )
Norm@50keV : 0.270914 ( )
------------------------------------------------------------
Chi-Squared = 69.99181 using 59 PHA bins.
Reduced chi-squared = 1.272578 for 55 degrees of freedom
Null hypothesis probability = 8.391E-02
Photon flux (15-150 keV) in 0.6120 sec: 6.48473 ( -0.48124 0.43512 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.39889e-07 ( -9.84708e-09 2.02511e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.5386 -0.8142 0.8625
R^2/D10^2 : 1.93529 -0.46428 0.61427
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Chi-Squared = 91.59755 using 59 PHA bins.
Reduced chi-squared = 1.606975 for 57 degrees of freedom
Null hypothesis probability = 2.483E-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.321e-08 3.931e-09
25- 50 9.971e-08 7.286e-09
50-150 7.769e-08 1.189e-08
15-150 2.106e-07 1.627e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 71.5525 -12.0539 15.8191
Norm : 33.6732 -3.3723 3.7597
------------------------------------------------------------
Chi-Squared = 75.14938 using 59 PHA bins.
Reduced chi-squared = 1.318410 for 57 degrees of freedom
Null hypothesis probability = 5.392E-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.299e-08 5.139e-09
25- 50 8.480e-08 5.780e-09
50-150 1.107e-07 1.708e-08
15-150 2.485e-07 2.187e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.10697 -1.60117 2.04838
R1^2/D10^2 : 19.1470 -12.8485 73.5769
kT2 [keV] : 14.8088 -1.9095 3.2024
R2^2/D10^2 : 0.604858 -0.375848 1e+24
------------------------------------------------------------
Chi-Squared = 69.33544 using 59 PHA bins.
Reduced chi-squared = 1.260644 for 55 degrees of freedom
Null hypothesis probability = 9.246E-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.802e-08 1.482e-08
25- 50 8.818e-08 1.914e-08
50-150 1.002e-07 2.498e-08
15-150 2.364e-07 4.249e-08
Plot creation:
Sat Jan 24 09:05:22 EST 2009