batgrbproduct Analysis for Trigger=294835
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 20:56:00 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger294835/GCN5_download_cron
======================================================================
Trigger: 00294835 Segment: 000
BAT Trigger Time: 214556549.248 [s; MET]
Trigger Stop: 214556549.76 [s; MET]
UTC: 2007-10-20T07:02:26.944040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 119.663756248614 Dec: 32.8612387898184 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 22.19
Image Trigger?: NO
Rate S/N Ratio: 180.449438901871 [ if not an image trigger ]
Image S/N Ratio: 22.19
Flight Position: [ source = BAT ]
RA: 119.663756248614 Dec: 32.8612387898184 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 119.66612610556 Dec: 32.8570215176938 [deg; J2000]
{ 07h 58m 39.9s , +32d 51' 25.3" }
+/- 0.540389356876306 [arcmin] (estimated 90% radius based on SNR)
+/- 0.132922836675766 [arcmin] (formal 1-sigma fit error)
SNR: 73.2766872708892
RA = 7h 58m 39.9s (119.666126 deg.)
Dec = 32d 51' 25" (32.857022 deg.)
Angular difference between Flight and Ground position is 0.279810 arcmin
Partial Coding Fraction: 0.90625 [ including projection effects ]
Duration
T90: 4.22800001502037 +/- 0.581982801632249
Measured from: -2.45199999213219
to: 1.77600002288818 [s; relative to TRIGTIME]
T50: 1.95600000023842 +/- 0.064498059620614
Measured from: -1.71199998259544
to: 0.244000017642975 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.356000006198883
to: 0.643999993801117 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.01199999451637
to: 7.37600001692772 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.706213 1.166523 1.110350 0.340668
0.019263 0.021107 0.020334 0.015510 [error]
Peak 0.185001 0.353047 0.426439 0.144956
0.007514 0.009316 0.010343 0.007623 [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 1.96e-07 4.59e-07 8.51e-07 3.79e-06 2.31e-06 5.17e-06 erg/cm2
Error 1.07e-08 1.43e-08 2.11e-08 2.38e-07 5.48e-08 0.00e+00 erg/cm2
Peak flux Power-law 1.56e+00 2.37e+00 2.70e+00 5.86e+00 8.38e+00 1.25e+01 ph/cm2/s
Error 1.08e-01 9.73e-02 8.16e-02 4.13e-01 2.52e-01 4.29e-01 ph/cm2/s
Fluence Cutoff-PL 1.90e-07 4.60e-07 8.59e-07 3.46e-06 2.30e-06 3.61e-06 erg/cm2
Error 1.46e-08 1.08e-08 3.01e-08 5.91e-07 5.60e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.56e+00 2.37e+00 2.70e+00 5.83e+00 8.38e+00 1.25e+01 ph/cm2/s
Error 1.08e-01 9.73e-02 8.17e-02 4.11e-01 2.52e-01 4.27e-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 1.46e+00 2.38e+00 2.78e+00 4.86e+00 8.31e+00 1.15e+01 ph/cm2/s
Error 1.50e-01 1.00e-01 1.15e-01 9.09e-01 2.61e-01 1.03e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.109 0.046 - - 2.13e-02 5.05e-04 47.824 57
CPL 1.024 0.148 708.8 4824.5 2.31e-02 2.50e-03 47.527 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.812 0.056 - - 7.29e-02 2.23e-03 51.351 57
CPL 0.603 0.227 422.8 4884.0 8.85e-02 1.64e-02 48.840 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: 2.880000 sec.
T50 in the 50-300 keV band: 1.792000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 10.388 -3.012 7.376
T90 4.228 -2.452 1.776
T50 1.956 -1.712 0.244
Peak 1.000 -0.356 0.644
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
119.6661 +32.8570 0.0026 15.1 -63.3 3.3952 73.3 TRIG_00294835
------------------------------------------
Foreground time interval of the image:
-3.012 7.376 (delta_t = 10.388 [sec])
Background time interval of the image:
-239.248 -3.012 (delta_t = 236.236 [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 -3.012 sec. to 7.376 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10861 ( -4.582202E-02 4.561186E-02) )
Norm@50keV : 2.132877E-02 ( -5.056225E-04 5.037729E-04) )
------------------------------------------------------------
Chi-Squared = 47.82379 using 59 PHA bins.
Reduced chi-squared = 0.8390138 for 57 degrees of freedom
Null hypothesis probability = 0.802
Photon flux (15-150 keV) in 10.39 sec: 2.47610 ( -0.06282 0.06312 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3106e-06 ( -5.47345e-08 5.48176e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.012 sec. to 7.376 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02370 ( -0.172540 0.123179 )
Epeak [keV] : 708.813 ( -357.768 9291.19 )
Norm@50keV : 2.310169E-02 ( -1.061240E-03 3.932014E-03) )
------------------------------------------------------------
Chi-Squared = 47.52676 using 59 PHA bins.
but latest trial 2.196940E-02 gives Chi-Squared = 5.68863
Reduced chi-squared = 0.8486921 for 56 degrees of freedom
Null hypothesis probability = 0.783
Photon flux (15-150 keV) in 10.39 sec: 2.47488 ( -0.06278 0.06308 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.30478e-06 ( -5.62099e-08 5.58774e-08 ) ergs/cm2
Band function
Time interval is from -3.012 sec. to 7.376 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.896539 ( -9.10346 3.45117 )
beta : -1.10861 ( -4.561365E-02 4.582047E-02) )
Epeak [keV] : 48.7841 ( -438.684 9561.22 )
Norm@50keV : 3.760390E-02 ( -2.382066E-03 1121.61 )
------------------------------------------------------------
Chi-Squared = 47.82376 using 59 PHA bins.
Reduced chi-squared = 0.8695230 for 55 degrees of freedom
Null hypothesis probability = 0.743
Photon flux (15-150 keV) in 10.39 sec: 2.45809 ( ) 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 -0.356 sec. to 0.644 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.812484 ( -5.582416E-02 5.538505E-02) )
Norm@50keV : 7.292827E-02 ( -2.236418E-03 2.228163E-03) )
------------------------------------------------------------
Chi-Squared = 51.35110 using 59 PHA bins.
Reduced chi-squared = 0.9008964 for 57 degrees of freedom
Null hypothesis probability = 0.686
Photon flux (15-150 keV) in 1.000 sec: 8.37839 ( -0.25191 0.25214 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.47762e-07 ( -2.6631e-08 2.6719e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.356 sec. to 0.644 sec.
Parameters : value lower 90% higher 90%
Photon index: 0.603415 ( -0.240099 0.214884 )
Epeak [keV] : 422.814 ( -190.728 9577.19 )
Norm@50keV : 8.852462E-02 ( -1.147894E-02 2.136363E-02) )
------------------------------------------------------------
Chi-Squared = 48.84045 using 59 PHA bins.
but latest trial 0.818298 gives Chi-Squared = 2.48464
but latest trial 7.696410E-02 gives Chi-Squared = 1.26543
Reduced chi-squared = 0.8721510 for 56 degrees of freedom
Null hypothesis probability = 0.740
Photon flux (15-150 keV) in 1.000 sec: 8.37621 ( -0.25181 0.25207 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.44575e-07 ( -2.7329e-08 2.7251e-08 ) ergs/cm2
Band function
Time interval is from -0.356 sec. to 0.644 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.762707 ( -14.9973 2.707005E-03) )
beta : -0.812487 ( -5.623579E-02 5.528283E-02) )
Epeak [keV] : 18.6927 ( -18.5927 10.7186 )
Norm@50keV : 0.100946 ( -5949.13 6.769198E+06) )
------------------------------------------------------------
Chi-Squared = 51.35108 using 59 PHA bins.
Reduced chi-squared = 0.9336560 for 55 degrees of freedom
Null hypothesis probability = 0.615
Photon flux (15-150 keV) in 1.000 sec: 8.31211 ( -0.26061 0.26128 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.44083e-07 ( -2.7383e-08 2.7224e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 21:10:58 EST 2007