batgrbproduct Analysis for Trigger=317205
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): Thu Jul 17 19:11:59 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger317205/GCN5_download_cron
======================================================================
Trigger: 00317205 Segment: 000
BAT Trigger Time: 237994202.688 [s; MET]
Trigger Stop: 237994210.88 [s; MET]
UTC: 2008-07-17T13:29:59.740240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 255.461306599058 Dec: -40.8677132050101 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.6
Image Trigger?: NO
Rate S/N Ratio: 9.89949493661167 [ if not an image trigger ]
Image S/N Ratio: 14.6
Flight Position: [ source = BAT ]
RA: 255.461306599058 Dec: -40.8677132050101 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 255.437280822397 Dec: -40.8555409333904 [deg; J2000]
{ 17h 01m 44.9s , -40d 51' 19.9" }
+/- 1.09970951111009 [arcmin] (estimated 90% radius based on SNR)
+/- 0.341305103813971 [arcmin] (formal 1-sigma fit error)
SNR: 26.5552158247441
Angular difference between Flight and Ground position is 1.312247 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 57.1200000047684 +/- 6.89290216155598
Measured from: -20.2199999988079
to: 36.9000000059605 [s; relative to TRIGTIME]
T50: 28.0720000267029 +/- 3.16643650716146
Measured from: -7.80799999833107
to: 20.2640000283718 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 14.33599999547
to: 15.33599999547 [s; relative to TRIGTIME]
Total Fluence
Measured from: -31.6200000047684
to: 44.8680000007153 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.536652 0.216803 -0.068822 0.002331
0.055166 0.045501 0.038263 0.033401 [error]
Peak 0.065460 0.007678 -0.000977 0.004534
0.006457 0.005234 0.004312 0.003786 [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 7.47e-07 1.15e-07 8.14e-09 6.14e-10 8.70e-07 8.70e-07 erg/cm2
Error 7.13e-08 2.02e-08 3.48e-09 4.52e-10 7.38e-08 7.38e-08 erg/cm2
Peak flux Power-law 5.94e-01 9.78e-02 7.55e-03 6.26e-04 7.00e-01 7.00e-01 ph/cm2/s
Error 1.10e-01 4.31e-02 8.86e-03 1.24e-03 1.35e-01 1.35e-01 ph/cm2/s
Fluence Cutoff-PL 7.59e-07 7.29e-08 5.05e-11 4.80e-18 8.32e-07 8.31e-07 erg/cm2
Error 7.76e-08 2.44e-08 6.59e-10 4.04e-13 7.85e-08 7.84e-08 erg/cm2
Peak flux Cutoff-PL 5.93e-01 9.77e-02 7.53e-03 6.21e-04 6.99e-01 6.99e-01 ph/cm2/s
Error 1.10e-01 4.31e-02 8.84e-03 1.23e-03 1.35e-01 1.35e-01 ph/cm2/s
Fluence Band 7.70e-07 8.48e-08 2.65e-09 8.50e-11 8.51e-07 8.57e-07 erg/cm2
Error 6.66e-08 1.34e-08 1.08e-08 6.91e-11 7.06e-08 0.00e+00 erg/cm2
Peak flux Band 6.20e-01 8.29e-02 2.39e-03 6.75e-05 7.05e-01 7.05e-01 ph/cm2/s
Error 1.14e-01 3.93e-02 6.67e-03 6.87e-04 1.33e-01 1.34e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 5.814 0.371 - - 1.10e-04 3.79e-05 56.824 57
CPL 1.356 0.000 3.0 0.0 5.06e-01 0.00e+00 49.225 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.696 0.786 - - 6.04e-04 6.08e-04 63.977 57
CPL -1.597 0.000 11.6 7.6 1.13e+02 2.13e+03 61.067 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 76.488 -31.620 44.868
T90 57.120 -20.220 36.900
T50 28.072 -7.808 20.264
Peak 1.000 14.336 15.336
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
255.4373 -40.8555 0.0073 5.0 62.2 2.7675 26.6 TRIG_00317205
------------------------------------------
Foreground time interval of the image:
-31.620 44.868 (delta_t = 76.488 [sec])
Background time interval of the image:
-222.587 -31.620 (delta_t = 190.967 [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 -31.620 sec. to 44.868 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.81446 ( -0.360227 0.382324 )
Norm@50keV : 1.096991E-04 ( -3.350656E-05 4.229059E-05) )
------------------------------------------------------------
Chi-Squared = 56.82431 using 59 PHA bins.
Reduced chi-squared = 0.9969177 for 57 degrees of freedom
Null hypothesis probability = 0.482
Photon flux (15-150 keV) in 76.49 sec: 0.375190 ( -0.033892 0.034028 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.6999e-07 ( -7.36828e-08 7.39199e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -31.620 sec. to 44.868 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35588 ( )
Epeak [keV] : 3.03015 ( )
Norm@50keV : 0.505573 ( )
------------------------------------------------------------
Chi-Squared = 49.22488 using 59 PHA bins.
Reduced chi-squared = 0.8790158 for 56 degrees of freedom
Null hypothesis probability = 0.727
Photon flux (15-150 keV) in 76.49 sec: 0.374749 ( -0.033837 0.03397 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.31729e-07 ( -7.8081e-08 7.88229e-08 ) ergs/cm2
Band function
Time interval is from -31.620 sec. to 44.868 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.29759 ( -0.702414 2.02379 )
beta : -5.82029 ( -0.376400 0.365811 )
Epeak [keV] : 208.142 ( -208.042 9791.86 )
Norm@50keV : 1.483156E-02 ( -4.475471E-03 5.825032E-03) )
------------------------------------------------------------
Chi-Squared = 56.82355 using 59 PHA bins.
Reduced chi-squared = 1.033156 for 55 degrees of freedom
Null hypothesis probability = 0.407
Photon flux (15-150 keV) in 76.49 sec: 0.373550 ( -0.037989 0.032963 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.51188e-07 ( -7.0302e-08 7.08909e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 14.336 sec. to 15.336 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.69635 ( -0.714371 0.856996 )
Norm@50keV : 6.040257E-04 ( -6.040257E-04 6.120721E-04) )
------------------------------------------------------------
Chi-Squared = 63.97653 using 59 PHA bins.
Reduced chi-squared = 1.122395 for 57 degrees of freedom
Null hypothesis probability = 0.245
Photon flux (15-150 keV) in 1.000 sec: 0.699541 ( -0.134848 0.135398 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.30079e-08 ( -5.0442e-09 5.3631e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 14.336 sec. to 15.336 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.59715 ( )
Epeak [keV] : 11.5743 ( -13.0031 2.11105 )
Norm@50keV : 113.442 ( -961.692 3304.23 )
------------------------------------------------------------
Chi-Squared = 61.06721 using 59 PHA bins.
Reduced chi-squared = 1.090486 for 56 degrees of freedom
Null hypothesis probability = 0.299
Photon flux (15-150 keV) in 1.000 sec: 0.698991 ( -0.134785 0.135334 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.17415e-08 ( -4.1882e-09 4.2444e-09 ) ergs/cm2
Band function
Time interval is from 14.336 sec. to 15.336 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.95618 ( -1.58729 3.32438 )
beta : -4.69555 ( -3.26193 2.22321 )
Epeak [keV] : 253.574 ( -8.22496 3.87716 )
Norm@50keV : 8.213764E-02 ( -1185.41 54167.9 )
------------------------------------------------------------
Chi-Squared = 63.97651 using 59 PHA bins.
Reduced chi-squared = 1.163209 for 55 degrees of freedom
Null hypothesis probability = 0.190
Photon flux (15-150 keV) in 1.000 sec: 0.705058 ( -0.130548 0.134862 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.20524e-08 ( -4.0468e-09 4.0192e-09 ) ergs/cm2
Plot creation:
Thu Jul 17 19:36:07 EDT 2008