batgrbproduct Analysis for Trigger=336489
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): Wed Dec 3 19:42:41 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger336489/GCN5_download_cron
======================================================================
Trigger: 00336489 Segment: 000
BAT Trigger Time: 250005434.88 [s; MET]
Trigger Stop: 250005435.904 [s; MET]
UTC: 2008-12-03T13:57:11.575340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 233.033331525279 Dec: 63.4983389938113 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.56
Image Trigger?: NO
Rate S/N Ratio: 14.5258390463339 [ if not an image trigger ]
Image S/N Ratio: 7.56
Flight Position: [ source = BAT ]
RA: 233.033331525279 Dec: 63.4983389938113 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 233.070412007788 Dec: 63.5139701039704 [deg; J2000]
{ 15h 32m 16.9s , +63d 30' 50.3" }
+/- 1.12001701544633 [arcmin] (estimated 90% radius based on SNR)
+/- 0.37051563861651 [arcmin] (formal 1-sigma fit error)
SNR: 25.870063423671
Angular difference between Flight and Ground position is 1.365522 arcmin
Partial Coding Fraction: 0.5703125 [ including projection effects ]
Duration
T90: 221 +/- 82.9698740507662
Measured from: -14.8799999058247
to: 206.120000094175 [s; relative to TRIGTIME]
T50: 41 +/- 4.12310562561766
Measured from: 9.12000009417534
to: 50.1200000941753 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 31.1200000047684
to: 32.1200000047684 [s; relative to TRIGTIME]
Total Fluence
Measured from: -68.8799999952316
to: 405.120000004768 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.264062 4.438475 3.374051 0.790195
0.115523 0.117223 0.104651 0.090978 [error]
Peak 0.073032 0.126437 0.117164 0.034840
0.007394 0.008183 0.007822 0.006191 [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 1.07e-06 1.92e-06 2.65e-06 7.60e-06 7.63e-06 1.32e-05 erg/cm2
Error 6.76e-08 7.00e-08 1.06e-07 6.97e-07 2.58e-07 7.54e-07 erg/cm2
Peak flux Power-law 8.02e-01 9.18e-01 7.54e-01 1.04e+00 2.85e+00 3.51e+00 ph/cm2/s
Error 1.02e-01 7.24e-02 6.15e-02 1.74e-01 2.04e-01 2.54e-01 ph/cm2/s
Fluence Cutoff-PL 1.03e-06 1.94e-06 2.68e-06 6.15e-06 7.55e-06 1.17e-05 erg/cm2
Error 8.45e-08 5.71e-08 1.17e-07 1.79e-06 2.82e-07 1.81e-06 erg/cm2
Peak flux Cutoff-PL 7.00e-01 9.68e-01 8.07e-01 5.48e-01 2.78e+00 3.02e+00 ph/cm2/s
Error 1.23e-01 8.44e-02 7.42e-02 2.56e-01 2.09e-01 3.26e-01 ph/cm2/s
Fluence Band 1.01e-06 1.94e-06 2.66e-06 6.95e-06 7.54e-06 1.26e-05 erg/cm2
Error 9.74e-08 8.72e-08 1.27e-07 1.76e-06 2.86e-07 1.25e-06 erg/cm2
Peak flux Band 7.00e-01 9.68e-01 8.07e-01 5.48e-01 2.78e+00 3.02e+00 ph/cm2/s
Error 1.23e-01 8.45e-02 7.42e-02 2.56e-01 2.09e-01 3.27e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.536 0.061 - - 1.71e-03 5.46e-05 47.075 57
CPL 1.313 0.000 167.4 4942.1 2.16e-03 4.73e-04 46.116 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.283 0.116 - - 2.40e-02 1.67e-03 57.470 57
CPL 0.630 0.505 111.3 85.4 4.95e-02 2.92e-02 51.717 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: 77.952000 sec.
T50 in the 50-300 keV band: 28.800000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 474.000 -68.880 405.120
T90 221.000 -14.880 206.120
T50 41.000 9.120 50.120
Peak 1.000 31.120 32.120
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
233.0704 +63.5140 0.0074 35.7 167.4 3.7530 25.9 TRIG_00336489
------------------------------------------
Foreground time interval of the image:
-68.880 14.921 (delta_t = 83.801 [sec])
Background time interval of the image:
-239.880 -68.880 (delta_t = 171.000 [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
Multiple GTIs in the spectrum
tstart tstop
-68.880000 295.060000
296.120000 405.120000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53555 ( -6.072295E-02 6.085098E-02) )
Norm@50keV : 1.709707E-03 ( -5.460938E-05 5.459320E-05) )
------------------------------------------------------------
Chi-Squared = 47.07484 using 59 PHA bins.
Reduced chi-squared = 0.8258743 for 57 degrees of freedom
Null hypothesis probability = 0.823
Photon flux (15-150 keV) in 472.9 sec: 0.215545 ( -0.007578 0.007605 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.62769e-06 ( -2.57305e-07 2.58062e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-68.880000 295.060000
296.120000 405.120000
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31314 ( )
Epeak [keV] : 167.399 ( -153.500 9730.59 )
Norm@50keV : 2.159724E-03 ( -2.638673E-04 6.813150E-04) )
------------------------------------------------------------
Chi-Squared = 46.11646 using 59 PHA bins.
but latest trial 115.849 gives Chi-Squared = 16.3775
Reduced chi-squared = 0.8235082 for 56 degrees of freedom
Null hypothesis probability = 0.824
Photon flux (15-150 keV) in 472.9 sec: 0.213077 ( -0.008364 0.008214 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.55165e-06 ( -2.84922e-07 2.79342e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-68.880000 295.060000
296.120000 405.120000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01720 ( -8.98280 1.27735 )
beta : -1.60448 ( -7.53319 0.976595 )
Epeak [keV] : 75.4693 ( -197.492 471.412 )
Norm@50keV : 3.345868E-03 ( -3.042615E-04 6.314355E-04) )
------------------------------------------------------------
Chi-Squared = 46.24490 using 59 PHA bins.
Reduced chi-squared = 0.8408163 for 55 degrees of freedom
Null hypothesis probability = 0.794
Photon flux (15-150 keV) in 472.9 sec: 0.212682 ( -0.008915 0.008657 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.54124e-06 ( -2.86388e-07 2.85537e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 31.120 sec. to 32.120 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28346 ( -0.116029 0.115699 )
Norm@50keV : 2.396900E-02 ( -1.667935E-03 1.667578E-03) )
------------------------------------------------------------
Chi-Squared = 57.47043 using 59 PHA bins.
Reduced chi-squared = 1.008253 for 57 degrees of freedom
Null hypothesis probability = 0.458
Photon flux (15-150 keV) in 1.000 sec: 2.85103 ( -0.20338 0.20364 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.37782e-07 ( -1.8196e-08 1.837e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 31.120 sec. to 32.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.630185 ( -0.535383 0.474410 )
Epeak [keV] : 111.347 ( -28.6633 142.181 )
Norm@50keV : 4.949409E-02 ( -1.985466E-02 3.850568E-02) )
------------------------------------------------------------
Chi-Squared = 51.71739 using 59 PHA bins.
Reduced chi-squared = 0.9235249 for 56 degrees of freedom
Null hypothesis probability = 0.638
Photon flux (15-150 keV) in 1.000 sec: 2.78407 ( -0.20924 0.2092 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29226e-07 ( -1.9452e-08 1.9752e-08 ) ergs/cm2
Band function
Time interval is from 31.120 sec. to 32.120 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.629262 ( -0.475332 0.534607 )
beta : -9.26378 ( -0.736221 7.96574 )
Epeak [keV] : 111.236 ( -28.5974 142.563 )
Norm@50keV : 4.954655E-02 ( -1.990646E-02 3.847365E-02) )
------------------------------------------------------------
Chi-Squared = 51.71737 using 59 PHA bins.
Reduced chi-squared = 0.9403158 for 55 degrees of freedom
Null hypothesis probability = 0.601
Photon flux (15-150 keV) in 1.000 sec: 2.78396 ( -0.20913 0.20937 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29299e-07 ( -1.9621e-08 1.9516e-08 ) ergs/cm2
Plot creation:
Wed Dec 3 19:59:56 EST 2008