batgrbproduct Analysis for Trigger=236481
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): Wed Jan 2 10:19:53 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger236481/GCN5_download_cron
======================================================================
Trigger: 00236481 Segment: 000
BAT Trigger Time: 184140797.728 [s; MET]
Trigger Stop: 184140798.112 [s; MET]
UTC: 2006-11-02T06:13:16.183220 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 32 ms to TRIGTIME + 320 ms
BAT
RA: 309.881006410199 Dec: 15.1789262981433 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.78
Image Trigger?: NO
Rate S/N Ratio: 8.66025403784439 [ if not an image trigger ]
Image S/N Ratio: 6.78
Flight Position: [ source = BAT ]
RA: 309.881006410199 Dec: 15.1789262981433 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 309.945818433201 Dec: 15.1481180124961 [deg; J2000]
{ 20h 39m 47.0s , +15d 08' 53.2" }
+/- 5.83555454188065 [arcmin] (estimated 90% radius based on SNR)
+/- 2.92861348519487 [arcmin] (formal 1-sigma fit error)
SNR: 2.44745848321546
RA = 20h 39m 47.0s (309.945818 deg.)
Dec = 15d 8' 53" (15.148118 deg.)
Angular difference between Flight and Ground position is 4.183828 arcmin
Partial Coding Fraction: 0.6640625 [ including projection effects ]
Duration
T90: 0.38400000333786 +/-
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
T50: 0.38400000333786 +/-
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.38400000333786 second)
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.000233 -0.001566 0.007397 0.004831
0.003934 0.003737 0.003291 0.002930 [error]
Peak -0.000233 -0.001566 0.007397 0.004831
0.003934 0.003737 0.003291 0.002930 [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 3.17e-10 6.85e-10 1.19e-09 4.81e-09 3.26e-09 6.90e-09 erg/cm2
Error 1.13e-09 1.24e-09 1.91e-09 3.52e-08 5.22e-09 3.56e-08 erg/cm2
Peak flux Power-law 2.53e-02 3.15e-02 2.70e-02 3.99e-02 9.85e-02 1.24e-01 ph/cm2/s
Error 9.98e-02 5.78e-02 4.32e-02 2.18e-01 1.72e-01 1.98e-01 ph/cm2/s
Fluence Cutoff-PL 6.70e-11 6.48e-10 2.42e-09 2.09e-09 4.60e-09 6.15e-09 erg/cm2
Error 5.76e-10 1.31e-09 3.00e-09 2.66e-08 5.81e-09 0.00e+00 erg/cm2
Peak flux Cutoff-PL 5.71e-03 2.85e-02 5.40e-02 2.53e-02 1.07e-01 1.13e-01 ph/cm2/s
Error 8.78e-02 5.91e-02 6.76e-02 2.12e-01 1.56e-01 1.81e-01 ph/cm2/s
Fluence Band 5.15e-11 7.66e-10 2.72e-09 1.03e-09 5.03e-09 4.65e-09 erg/cm2
Error 1.23e-09 3.27e-09 2.96e-08 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 2.20e-03 1.90e-02 5.62e-02 3.12e-02 9.91e-02 1.09e-01 ph/cm2/s
Error 1.39e-02 5.05e-02 4.87e-02 1.69e-01 9.26e-02 1.70e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.274 6.500 - - 8.74e-04 1.35e-03 52.369 57
CPL -2.500 0.000 102.7 5000.0 1.09e-02 4.82e-01 51.751 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.274 6.500 - - 8.74e-04 1.35e-03 52.369 57
CPL -2.500 0.000 102.7 5000.0 1.09e-02 4.82e-01 51.751 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 0.384 0.000 0.384
T90 0.384 0.000 0.384
T50 0.384 0.000 0.384
Peak 0.384 0.000 0.384
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
309.9458 +15.1481 0.0782 37.3 -164.2 0.0170 2.4 TRIG_00236481
------------------------------------------
Foreground time interval of the image:
-0.032 0.352 (delta_t = 0.384 [sec])
Background time interval of the image:
-239.760 -5.760 (delta_t = 234.000 [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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27441 ( -4.27442 8.72558 )
Norm@50keV : 8.744464E-04 ( -8.744464E-04 1.819793E-03) )
------------------------------------------------------------
Chi-Squared = 52.36940 using 59 PHA bins.
Reduced chi-squared = 0.9187613 for 57 degrees of freedom
Null hypothesis probability = 0.649
Photon flux (15-150 keV) in 0.3840 sec: 9.854217E-02 ( -0.0985422 0.245428 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.25851e-09 ( -3.25851e-09 7.17539e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49974 ( )
Epeak [keV] : 102.670 ( -91.9068 9908.08 )
Norm@50keV : 1.091902E-02 ( -2.014491E-02 0.944037 )
------------------------------------------------------------
Chi-Squared = 51.75129 using 59 PHA bins.
Reduced chi-squared = 0.9241301 for 56 degrees of freedom
Null hypothesis probability = 0.636
Photon flux (15-150 keV) in 0.3840 sec: 0.107038 ( -0.107038 0.205595 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.60159e-09 ( -4.60159e-09 7.02401e-09 ) ergs/cm2
Band function
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.95688 ( -14.9715 2.850437E-02) )
beta : -9.24622 ( -0.630141 19.3699 )
Epeak [keV] : 98.4919 ( -88.3307 9911.57 )
Norm@50keV : 2.371948E-02 ( -7.199027E-02 2.062946E+07) )
------------------------------------------------------------
Chi-Squared = 51.52167 using 59 PHA bins.
Reduced chi-squared = 0.9367576 for 55 degrees of freedom
Null hypothesis probability = 0.608
Photon flux (15-150 keV) in 0.3840 sec: 9.909930E-02 ( -0.0990993 0.0860997 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.03128e-09 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27441 ( -4.27442 8.72558 )
Norm@50keV : 8.744464E-04 ( -8.744464E-04 1.819793E-03) )
------------------------------------------------------------
Chi-Squared = 52.36940 using 59 PHA bins.
Reduced chi-squared = 0.9187613 for 57 degrees of freedom
Null hypothesis probability = 0.649
Photon flux (15-150 keV) in 0.3840 sec: 9.854217E-02 ( -0.0985422 0.245428 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.25851e-09 ( -3.25851e-09 7.17539e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49974 ( )
Epeak [keV] : 102.670 ( -91.9068 9908.08 )
Norm@50keV : 1.091902E-02 ( -2.014491E-02 0.944037 )
------------------------------------------------------------
Chi-Squared = 51.75129 using 59 PHA bins.
Reduced chi-squared = 0.9241301 for 56 degrees of freedom
Null hypothesis probability = 0.636
Photon flux (15-150 keV) in 0.3840 sec: 0.107038 ( -0.107038 0.205595 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.60159e-09 ( -4.60159e-09 7.02401e-09 ) ergs/cm2
Band function
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.95688 ( -14.9715 2.850437E-02) )
beta : -9.24622 ( -0.630141 19.3699 )
Epeak [keV] : 98.4919 ( -88.3307 9911.57 )
Norm@50keV : 2.371948E-02 ( -7.199027E-02 2.062946E+07) )
------------------------------------------------------------
Chi-Squared = 51.52167 using 59 PHA bins.
Reduced chi-squared = 0.9367576 for 55 degrees of freedom
Null hypothesis probability = 0.608
Photon flux (15-150 keV) in 0.3840 sec: 9.909930E-02 ( -0.0990993 0.0860997 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.03128e-09 ( 0 0 ) ergs/cm2
Plot creation:
Wed Jan 2 10:37:00 EST 2008