batgrbproduct Analysis for Trigger=373871
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 v2.45
Process Start Time (local time): Tue Oct 27 05:23:36 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger373871/GCN5_download_cron
======================================================================
Trigger: 00373871 Segment: 000
BAT Trigger Time: 278255495.36 [s; MET]
Trigger Stop: 278255496.384 [s; MET]
UTC: 2009-10-26T13:11:30.155080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 276.583106903892 Dec: -86.1214064707332 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.08
Image Trigger?: NO
Rate S/N Ratio: 25.9422435421457 [ if not an image trigger ]
Image S/N Ratio: 12.08
Flight Position: [ source = BAT ]
RA: 276.583106903892 Dec: -86.1214064707332 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 276.644925082004 Dec: -86.1109427251587 [deg; J2000]
{ 18h 26m 34.8s , -86d 06' 39.4" }
+/- 1.02830904726027 [arcmin] (estimated 90% radius based on SNR)
+/- 0.510613470300787 [arcmin] (formal 1-sigma fit error)
SNR: 29.2279846259965
Angular difference between Flight and Ground position is 0.676225 arcmin
Partial Coding Fraction: 0.3632812 [ including projection effects ]
Duration
T90: 168.319999992847 +/- 70.2208630006346
Measured from: -2.23999989032745
to: 166.08000010252 [s; relative to TRIGTIME]
T50: 35.9679999947548 +/- 10.5195832533643
Measured from: 0.960000097751617
to: 36.9280000925064 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.212000012397766
to: 0.787999987602234 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.64800000190735
to: 218.751999974251 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.060224 1.349222 0.817823 0.317729
0.084706 0.087853 0.079437 0.072546 [error]
Peak 0.061602 0.095710 0.088222 0.031563
0.009405 0.010409 0.010083 0.008271 [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 3.48e-07 5.61e-07 6.84e-07 1.64e-06 2.06e-06 3.23e-06 erg/cm2
Error 4.19e-08 4.28e-08 7.83e-08 3.89e-07 1.83e-07 4.60e-07 erg/cm2
Peak flux Power-law 5.89e-01 6.88e-01 5.79e-01 8.23e-01 2.15e+00 2.68e+00 ph/cm2/s
Error 1.35e-01 9.46e-02 8.39e-02 2.58e-01 2.63e-01 3.42e-01 ph/cm2/s
Fluence Cutoff-PL 1.05e-06 1.99e-06 2.73e-06 5.79e-06 7.66e-06 1.16e-05 erg/cm2
Error 1.29e-07 1.16e-07 2.34e-07 2.54e-06 6.13e-07 3.13e-06 erg/cm2
Peak flux Cutoff-PL 5.88e-01 6.88e-01 5.79e-01 8.18e-01 2.15e+00 2.67e+00 ph/cm2/s
Error 1.35e-01 9.47e-02 8.40e-02 2.57e-01 2.63e-01 3.41e-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 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.715 0.139 - - 1.00e-03 8.43e-05 66.740 57
CPL 1.618 0.000 174.3 0.0 1.14e-03 0.00e+00 66.580 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.249 0.218 - - 1.82e-02 2.18e-03 74.710 57
CPL 1.241 0.379 9999.1 0.0 1.82e-02 1.60e-02 74.730 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: 11.904000 sec.
T50 in the 50-300 keV band: 4.864000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 222.400 -3.648 218.752
T90 168.320 -2.240 166.080
T50 35.968 0.960 36.928
Peak 1.000 -0.212 0.788
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
276.6449 -86.1109 0.0066 33.1 -110.8 2.2387 29.2 TRIG_00373871
------------------------------------------
Foreground time interval of the image:
-3.648 14.041 (delta_t = 17.689 [sec])
Background time interval of the image:
-239.360 -3.648 (delta_t = 235.712 [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
Time interval is from -3.648 sec. to 218.752 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71484 ( -0.137461 0.139786 )
Norm@50keV : 1.00197E-03 ( -8.47817e-05 8.37961e-05 )
------------------------------------------------------------
# Chi-Squared = 66.74 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 57 degrees of freedom
# Null hypothesis probability = 1.770997e-01
Photon flux (15-150 keV) in 222.4 sec: 0.133770 ( -0.0102569 0.0102637 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.0609e-06 ( -1.82071e-07 1.8423e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.648 sec. to 218.752 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61779 ( )
Epeak [keV] : 174.278 ( )
Norm@50keV : 1.13727E-03 ( )
------------------------------------------------------------
# Chi-Squared = 66.58 using 59 PHA bins.
# Reduced chi-squared = 1.189 for 56 degrees of freedom
# Null hypothesis probability = 1.574789e-01
Photon flux (15-150 keV) in 222.4 sec: 0.462074 ( -0.030271 0.03014 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.65943e-06 ( -6.19695e-07 6.05506e-07 ) ergs/cm2
Band function
Time interval is from -3.648 sec. to 218.752 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.53946 ( -7.26479 -6.0663 )
beta : -1.86105 ( -0.222156 0.187828 )
Epeak [keV] : 24.9654 ( -4.9986 4.00111 )
Norm@50keV : 59.7398 ( -2.57772 5.6422 )
------------------------------------------------------------
# Chi-Squared = 61.76 using 59 PHA bins.
# Reduced chi-squared = 1.123 for 55 degrees of freedom
# Null hypothesis probability = 2.473992e-01
Photon flux (15-150 keV) in 222.4 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 -0.192 sec. to 0.768 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24915 ( -0.219211 0.217179 )
Norm@50keV : 1.81863E-02 ( -0.0021808 0.00217623 )
------------------------------------------------------------
# Chi-Squared = 74.71 using 59 PHA bins.
# Reduced chi-squared = 1.311 for 57 degrees of freedom
# Null hypothesis probability = 5.776620e-02
Photon flux (15-150 keV) in 0.96 sec: 2.15065 ( -0.262255 0.262912 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74767e-07 ( -2.37341e-08 2.3962e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.192 sec. to 0.768 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24084 ( -0.537892 0.219366 )
Epeak [keV] : 9999.15 ( -9971.02 -9971.02 )
Norm@50keV : 1.82495E-02 ( -0.0182681 0.0137661 )
------------------------------------------------------------
# Chi-Squared = 74.73 using 59 PHA bins.
# Reduced chi-squared = 1.334 for 56 degrees of freedom
# Null hypothesis probability = 4.796238e-02
Photon flux (15-150 keV) in 0.96 sec: 2.14994 ( -0.26218 0.26282 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74793e-07 ( -2.37437e-08 2.3975e-08 ) ergs/cm2
Band function
Time interval is from -0.192 sec. to 0.768 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.83817 ( -13.7734 -13.7734 )
beta : -1.28384 ( -0.26858 0.228961 )
Epeak [keV] : 23.2300 ( -23.1217 8.63213 )
Norm@50keV : 1795.50 ( -1864.15 1690.33 )
------------------------------------------------------------
# Chi-Squared = 74.21 using 59 PHA bins.
# Reduced chi-squared = 1.349 for 55 degrees of freedom
# Null hypothesis probability = 4.311306e-02
Photon flux (15-150 keV) in 0.96 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Tue Oct 27 05:47:21 EDT 2009