batgrbproduct Analysis for Trigger=356912
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): Fri Jul 10 00:16:05 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger356912/GCN5_download_cron
======================================================================
Trigger: 00356912 Segment: 000
BAT Trigger Time: 268844867.776 [s; MET]
Trigger Stop: 268844868.8 [s; MET]
UTC: 2009-07-09T15:07:42.879640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 93.5932107495315 Dec: 64.0853192755238 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.47
Image Trigger?: NO
Rate S/N Ratio: 15.7480157480236 [ if not an image trigger ]
Image S/N Ratio: 7.47
Flight Position: [ source = BAT ]
RA: 93.5932107495315 Dec: 64.0853192755238 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 93.5078696694029 Dec: 64.0725935515052 [deg; J2000]
{ 06h 14m 01.9s , +64d 04' 21.3" }
+/- 1.63284044451504 [arcmin] (estimated 90% radius based on SNR)
+/- 0.561921713772594 [arcmin] (formal 1-sigma fit error)
SNR: 15.0977776185982
Angular difference between Flight and Ground position is 2.364968 arcmin
Partial Coding Fraction: 0.1582031 [ including projection effects ]
Duration
T90: 26.7520000338554 +/- 4.59868503821182
Measured from: -2.62399989366531
to: 24.1280001401901 [s; relative to TRIGTIME]
T50: 9.31200003623962 +/- 5.03683074722854
Measured from: 0.736000120639801
to: 10.0480001568794 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.979999959468842
to: 1.97999995946884 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.40800005197525
to: 27.7599999904633 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.562115 0.795049 0.760507 0.150962
0.073777 0.078133 0.070970 0.060533 [error]
Peak 0.049778 0.112471 0.098981 0.035794
0.014119 0.016273 0.014601 0.011365 [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 1.87e-07 3.54e-07 5.19e-07 1.63e-06 1.47e-06 2.69e-06 erg/cm2
Error 3.24e-08 3.81e-08 6.67e-08 4.46e-07 1.64e-07 4.96e-07 erg/cm2
Peak flux Power-law 6.17e-01 7.19e-01 6.02e-01 8.52e-01 2.24e+00 2.79e+00 ph/cm2/s
Error 1.81e-01 1.34e-01 1.08e-01 3.06e-01 3.76e-01 4.61e-01 ph/cm2/s
Fluence Cutoff-PL 1.60e-07 3.81e-07 5.53e-07 6.19e-07 1.40e-06 1.71e-06 erg/cm2
Error 4.01e-08 4.65e-08 7.75e-08 5.85e-07 1.75e-07 6.03e-07 erg/cm2
Peak flux Cutoff-PL 4.63e-01 7.87e-01 6.90e-01 3.13e-01 2.16e+00 2.25e+00 ph/cm2/s
Error 2.14e-01 1.64e-01 1.38e-01 3.21e-01 3.86e-01 4.92e-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 2.33e+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 1.448 0.171 - - 4.63e-03 4.73e-04 44.940 57
CPL 0.648 0.790 88.3 138.9 1.13e-02 1.17e-02 41.320 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.255 0.255 - - 1.90e-02 3.06e-03 66.570 57
CPL -0.021 1.353 86.1 111.8 7.54e-02 1.98e-01 62.710 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: 4.288000 sec.
T50 in the 50-300 keV band: 2.176000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 33.168 -5.408 27.760
T90 26.752 -2.624 24.128
T50 9.312 0.736 10.048
Peak 1.000 0.980 1.980
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
93.5079 +64.0726 0.0127 37.0 -87.5 2.5529 15.1 TRIG_00356912
------------------------------------------
Foreground time interval of the image:
-5.408 27.760 (delta_t = 33.168 [sec])
Background time interval of the image:
-239.776 -5.408 (delta_t = 234.368 [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 -5.408 sec. to 27.760 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44786 ( -0.170025 0.171276 )
Norm@50keV : 4.62605E-03 ( -0.000473906 0.000472157 )
------------------------------------------------------------
# Chi-Squared = 44.94 using 59 PHA bins.
# Reduced chi-squared = 0.7884 for 57 degrees of freedom
# Null hypothesis probability = 8.763892e-01
Photon flux (15-150 keV) in 33.17 sec: 0.569796 ( -0.0590641 0.059179 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.46895e-06 ( -1.63615e-07 1.64861e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.408 sec. to 27.760 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.648400 ( -0.859496 0.720724 )
Epeak [keV] : 88.3109 ( -22.5273 255.199 )
Norm@50keV : 1.13182E-02 ( -0.00616495 0.0171445 )
------------------------------------------------------------
# Chi-Squared = 41.32 using 59 PHA bins.
# Reduced chi-squared = 0.7378 for 56 degrees of freedom
# Null hypothesis probability = 9.288292e-01
Photon flux (15-150 keV) in 33.17 sec: 0.550448 ( -0.061966 0.061766 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40432e-06 ( -1.74159e-07 1.75867e-07 ) ergs/cm2
Band function
Time interval is from -5.408 sec. to 27.760 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.648788 ( -0.50329 0.802893 )
beta : -10.00000 ( 1.203e+11 1.203e+11 )
Epeak [keV] : 88.3129 ( -22.5409 255.593 )
Norm@50keV : 1.13134E-02 ( -0.00591668 0.0171601 )
------------------------------------------------------------
# Chi-Squared = 41.32 using 59 PHA bins.
# Reduced chi-squared = 0.7512 for 55 degrees of freedom
# Null hypothesis probability = 9.141913e-01
Photon flux (15-150 keV) in 33.17 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 0.976 sec. to 1.984 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25512 ( -0.257056 0.252524 )
Norm@50keV : 1.89610E-02 ( -0.00305693 0.0030564 )
------------------------------------------------------------
# Chi-Squared = 66.57 using 59 PHA bins.
# Reduced chi-squared = 1.168 for 57 degrees of freedom
# Null hypothesis probability = 1.809257e-01
Photon flux (15-150 keV) in 1.008 sec: 2.24447 ( -0.375522 0.377074 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.91019e-07 ( -3.27701e-08 3.29901e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.976 sec. to 1.984 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.14738E-02 ( -1.5778 1.12755 )
Epeak [keV] : 86.1086 ( -23.2769 200.341 )
Norm@50keV : 7.53530E-02 ( -0.0753531 0.321208 )
------------------------------------------------------------
# Chi-Squared = 62.71 using 59 PHA bins.
# Reduced chi-squared = 1.120 for 56 degrees of freedom
# Null hypothesis probability = 2.505688e-01
Photon flux (15-150 keV) in 1.008 sec: 2.15559 ( -0.3858 0.38666 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.81304e-07 ( -3.51379e-08 3.50078e-08 ) ergs/cm2
Band function
Time interval is from 0.976 sec. to 1.984 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.19249E-02 ( -1.00932 1.59141 )
beta : -10.00000 ( 2.90161e+08 2.90161e+08 )
Epeak [keV] : 86.0808 ( -23.263 200.373 )
Norm@50keV : 7.53999E-02 ( -0.0754009 0.321605 )
------------------------------------------------------------
# Chi-Squared = 62.71 using 59 PHA bins.
# Reduced chi-squared = 1.140 for 55 degrees of freedom
# Null hypothesis probability = 2.217937e-01
Photon flux (15-150 keV) in 1.008 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Fri Jul 10 00:28:41 EDT 2009