batgrbproduct Analysis for Trigger=295301
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 v2.41
Process Start Time (local time): Fri Dec 14 21:29:59 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger295301/GCN5_download_cron
======================================================================
Trigger: 00295301 Segment: 000
BAT Trigger Time: 214978136 [s; MET]
Trigger Stop: 214978200 [s; MET]
UTC: 2007-10-25T04:08:53.685000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 355.084178674568 Dec: 31.7568181976365 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.87
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.87
Flight Position: [ source = BAT ]
RA: 355.084178674568 Dec: 31.7568181976365 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 355.064994609924 Dec: 31.7842250362176 [deg; J2000]
{ 23h 40m 15.6s , +31d 47' 03.2" }
+/- 1.29178314164006 [arcmin] (estimated 90% radius based on SNR)
+/- 0.529013993729375 [arcmin] (formal 1-sigma fit error)
SNR: 21.0996900869775
RA = 23h 40m 15.6s (355.064995 deg.)
Dec = 31d 47' 3" (31.784225 deg.)
Angular difference between Flight and Ground position is 1.913556 arcmin
Partial Coding Fraction: 0.4882812 [ including projection effects ]
Duration
T90: 238.136000007391 +/- 36.1321481948207
Measured from: 59.4639999866486
to: 297.59999999404 [s; relative to TRIGTIME]
T50: 53.244000017643 +/- 3.94627113304533
Measured from: 82.1480000019073
to: 135.39200001955 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 80.1680000126362
to: 81.1680000126362 [s; relative to TRIGTIME]
Total Fluence
Measured from: 38.5
to: 437.175999999046 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.027359 4.707266 2.966254 0.667803
0.100596 0.101757 0.090066 0.077618 [error]
Peak 0.048883 0.068595 0.059148 0.018875
0.007715 0.007931 0.007088 0.005562 [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 1.35e-06 2.08e-06 2.41e-06 5.37e-06 7.42e-06 1.12e-05 erg/cm2
Error 8.17e-08 6.96e-08 9.74e-08 5.01e-07 2.28e-07 5.51e-07 erg/cm2
Peak flux Power-law 4.95e-01 5.24e-01 3.93e-01 4.78e-01 1.59e+00 1.89e+00 ph/cm2/s
Error 1.08e-01 7.03e-02 5.80e-02 1.46e-01 1.99e-01 2.32e-01 ph/cm2/s
Fluence Cutoff-PL 1.32e-06 2.09e-06 2.43e-06 4.64e-06 7.36e-06 1.02e-05 erg/cm2
Error 1.05e-07 5.69e-08 7.61e-08 1.21e-06 2.62e-07 1.27e-06 erg/cm2
Peak flux Cutoff-PL 4.61e-01 5.42e-01 4.09e-01 3.27e-01 1.58e+00 1.74e+00 ph/cm2/s
Error 1.59e-01 8.16e-02 6.84e-02 2.34e-01 2.03e-01 3.19e-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 4.61e-01 5.42e-01 4.09e-01 3.27e-01 1.58e+00 1.74e+00 ph/cm2/s
Error 1.28e-01 8.17e-02 6.87e-02 2.33e-01 2.03e-01 3.19e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.788 0.062 - - 2.02e-03 6.11e-05 41.191 57
CPL 1.651 0.206 135.0 4959.0 2.34e-03 4.94e-04 40.670 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.416 0.209 - - 1.30e-02 1.59e-03 42.570 57
CPL 1.056 0.731 138.5 4964.4 1.96e-02 1.29e-02 41.950 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: 128.832000 sec.
T50 in the 50-300 keV band: 44.096000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 398.676 38.500 437.176
T90 238.136 59.464 297.600
T50 53.244 82.148 135.392
Peak 1.000 80.168 81.168
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
355.0650 +31.7842 0.0091 30.6 135.9 1.7870 21.1 TRIG_00295301
------------------------------------------
Foreground time interval of the image:
38.500 71.201 (delta_t = 32.701 [sec])
Background time interval of the image:
-239.000 -56.330 (delta_t = 182.670 [sec])
-55.000 25.240 (delta_t = 80.240 [sec])
26.000 38.500 (delta_t = 12.500 [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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 38.500 sec. to 437.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78789 ( -6.160998E-02 6.193650E-02) )
Norm@50keV : 2.020588E-03 ( -6.113225E-05 6.101467E-05) )
------------------------------------------------------------
Chi-Squared = 41.19060 using 59 PHA bins.
Reduced chi-squared = 0.7226421 for 57 degrees of freedom
Null hypothesis probability = 0.943
Photon flux (15-150 keV) in 398.7 sec: 0.277137 ( -0.009614 0.009676 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.42013e-06 ( -2.28455e-07 2.28335e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 38.500 sec. to 437.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65150 ( -0.221320 0.191358 )
Epeak [keV] : 134.953 ( -52.9568 9865.05 )
Norm@50keV : 2.339760E-03 ( -3.717896E-04 6.166731E-04) )
------------------------------------------------------------
Chi-Squared = 40.66954 using 59 PHA bins.
Reduced chi-squared = 0.7262417 for 56 degrees of freedom
Null hypothesis probability = 0.939
Photon flux (15-150 keV) in 398.7 sec: 0.274412 ( -0.011175 0.011247 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.36116e-06 ( -2.68485e-07 2.56364e-07 ) ergs/cm2
Band function
Time interval is from 38.500 sec. to 437.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.35769 ( -8.64231 3.43002 )
beta : -1.79732 ( -7.90590 0.361273 )
Epeak [keV] : 41.8425 ( -139.469 627.468 )
Norm@50keV : 4.014547E-03 ( -2.737136E-04 740.272 )
------------------------------------------------------------
Chi-Squared = 41.00114 using 59 PHA bins.
Reduced chi-squared = 0.7454754 for 55 degrees of freedom
Null hypothesis probability = 0.920
Photon flux (15-150 keV) in 398.7 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 80.168 sec. to 81.168 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41553 ( -0.208893 0.208876 )
Norm@50keV : 1.304847E-02 ( -1.589630E-03 1.586193E-03) )
------------------------------------------------------------
Chi-Squared = 42.57029 using 59 PHA bins.
Reduced chi-squared = 0.7468472 for 57 degrees of freedom
Null hypothesis probability = 0.923
Photon flux (15-150 keV) in 1.000 sec: 1.59470 ( -0.1985 0.1989 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.2573e-07 ( -1.6761e-08 1.682e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 80.168 sec. to 81.168 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.05644 ( -0.921306 0.540461 )
Epeak [keV] : 138.526 ( -67.2373 9861.47 )
Norm@50keV : 1.955859E-02 ( -7.862202E-03 1.797802E-02) )
------------------------------------------------------------
Chi-Squared = 41.94999 using 59 PHA bins.
but latest trial 1.169787E-02 gives Chi-Squared = 2.68113
but latest trial 5.436759E-02 gives Chi-Squared = 186.948
Reduced chi-squared = 0.7491069 for 56 degrees of freedom
Null hypothesis probability = 0.918
Photon flux (15-150 keV) in 1.000 sec: 1.57533 ( -0.2036 0.20288 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.23565e-07 ( -1.7829e-08 1.7537e-08 ) ergs/cm2
Band function
Time interval is from 80.168 sec. to 81.168 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.05406 ( -0.542857 0.919067 )
beta : -8.49295 ( -1.50706 7.26040 )
Epeak [keV] : 137.855 ( -66.5902 9862.15 )
Norm@50keV : 1.961282E-02 ( -7.925340E-03 3.383953E-02) )
------------------------------------------------------------
Chi-Squared = 41.94998 using 59 PHA bins.
Reduced chi-squared = 0.7627268 for 55 degrees of freedom
Null hypothesis probability = 0.902
Photon flux (15-150 keV) in 1.000 sec: 1.57542 ( -0.20365 0.20321 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.23449e-07 ( -1.7792e-08 1.7605e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 21:49:25 EST 2007