batgrbproduct Analysis for Trigger=350922
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 v2.44
Process Start Time (local time): Thu Apr 30 10:29:09 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger350922/GCN5_download_cron
======================================================================
Trigger: 00350922 Segment: 000
BAT Trigger Time: 262760767.872 [s; MET]
Trigger Stop: 262760769.92 [s; MET]
UTC: 2009-04-30T05:06:03.170860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 149.435502604913 Dec: 47.54872720162 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.98
Image Trigger?: NO
Rate S/N Ratio: 26.2868788561898 [ if not an image trigger ]
Image S/N Ratio: 5.98
Flight Position: [ source = BAT ]
RA: 149.435502604913 Dec: 47.54872720162 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 149.382893198501 Dec: 47.5307204548167 [deg; J2000]
{ 09h 57m 31.9s , +47d 31' 50.6" }
+/- 3.81674876786201 [arcmin] (estimated 90% radius based on SNR)
+/- 2.36860168142329 [arcmin] (formal 1-sigma fit error)
SNR: 4.48877213671139
Angular difference between Flight and Ground position is 2.389171 arcmin
Partial Coding Fraction: 0.8125 [ including projection effects ]
Duration
T90: 2.04799997806549 +/-
Measured from: 0
to: 2.04799997806549 [s; relative to TRIGTIME]
T50: 2.04799997806549 +/-
Measured from: 0
to: 2.04799997806549 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 2.04799997806549 second)
Measured from: 0
to: 2.04799997806549 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 2.04799997806549 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.029133 0.024616 -0.004353 0.000590
0.007724 0.007991 0.007039 0.006219 [error]
Peak 0.029133 0.024616 -0.004353 0.000590
0.007724 0.007991 0.007039 0.006219 [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 8.56e-09 7.76e-09 4.85e-09 4.64e-09 2.31e-08 2.58e-08 erg/cm2
Error 3.47e-09 3.81e-09 5.05e-09 8.77e-09 1.17e-08 1.66e-08 erg/cm2
Peak flux Power-law 1.38e-01 7.01e-02 2.19e-02 8.76e-03 2.35e-01 2.39e-01 ph/cm2/s
Error 5.68e-02 3.32e-02 1.93e-02 1.53e-02 9.11e-02 9.39e-02 ph/cm2/s
Fluence Cutoff-PL 8.81e-09 1.04e-08 1.01e-09 1.40e-12 2.02e-08 2.03e-08 erg/cm2
Error 3.80e-09 5.45e-09 3.37e-09 1.32e-09 8.47e-09 8.48e-09 erg/cm2
Peak flux Cutoff-PL 1.39e-01 9.60e-02 5.07e-03 3.50e-06 2.39e-01 2.38e-01 ph/cm2/s
Error 6.02e-02 4.67e-02 1.57e-02 2.91e-03 8.42e-02 8.51e-02 ph/cm2/s
Fluence Band 8.59e-09 1.03e-08 9.24e-10 6.58e-12 2.01e-08 2.12e-08 erg/cm2
Error 3.91e-09 5.50e-09 7.82e-10 1.93e-11 9.76e-09 1.25e-08 erg/cm2
Peak flux Band 1.39e-01 9.06e-02 1.35e-02 2.82e-04 2.43e-01 2.40e-01 ph/cm2/s
Error 4.99e-02 3.00e-02 1.49e-02 8.02e-03 8.66e-02 8.74e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.677 0.850 - - 1.07e-03 9.30e-04 63.314 57
CPL -1.741 0.000 25.4 7.5 1.28e+00 2.03e+01 60.131 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.677 0.850 - - 1.07e-03 9.30e-04 63.314 57
CPL -1.741 0.000 25.4 7.5 1.28e+00 2.03e+01 60.131 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 2.048 0.000 2.048
T90 2.048 0.000 2.048
T50 2.048 0.000 2.048
Peak 2.048 0.000 2.048
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
149.3829 +47.5307 0.0428 29.4 -27.1 0.0656 4.5 TRIG_00350922
------------------------------------------
Foreground time interval of the image:
0.000 2.048 (delta_t = 2.048 [sec])
Background time interval of the image:
-60.872 -7.872 (delta_t = 53.000 [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.
- 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 0.000 sec. to 2.048 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.67677 ( -0.699857 0.999831 )
Norm@50keV : 1.069578E-03 ( -1.069578E-03 7.894521E-04) )
------------------------------------------------------------
Chi-Squared = 63.31429 using 59 PHA bins.
Reduced chi-squared = 1.110777 for 57 degrees of freedom
Null hypothesis probability = 0.263
Photon flux (15-150 keV) in 2.048 sec: 0.235106 ( -0.090211 0.092081 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.31217e-08 ( -1.07097e-08 1.26847e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.74121 ( )
Epeak [keV] : 25.4241 ( -6.56386 8.37131 )
Norm@50keV : 1.28287 ( -9.20595 31.4016 )
------------------------------------------------------------
Chi-Squared = 60.13077 using 59 PHA bins.
Reduced chi-squared = 1.073764 for 56 degrees of freedom
Null hypothesis probability = 0.329
Photon flux (15-150 keV) in 2.048 sec: 0.239256 ( -0.083705 0.084622 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.02172e-08 ( -7.66931e-09 9.27048e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.38434 ( )
beta : -6.78026 ( )
Epeak [keV] : 15.7917 ( )
Norm@50keV : 8.045073E-03 ( )
------------------------------------------------------------
Chi-Squared = 61.62445 using 59 PHA bins.
Reduced chi-squared = 1.120445 for 55 degrees of freedom
Null hypothesis probability = 0.251
Photon flux (15-150 keV) in 2.048 sec: 0.243397 ( -0.086609 0.086626 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.01452e-08 ( -7.84032e-09 1.16862e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.67677 ( -0.699857 0.999831 )
Norm@50keV : 1.069578E-03 ( -1.069578E-03 7.894521E-04) )
------------------------------------------------------------
Chi-Squared = 63.31429 using 59 PHA bins.
Reduced chi-squared = 1.110777 for 57 degrees of freedom
Null hypothesis probability = 0.263
Photon flux (15-150 keV) in 2.048 sec: 0.235106 ( -0.090211 0.092081 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.31217e-08 ( -1.07097e-08 1.26847e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.74121 ( )
Epeak [keV] : 25.4241 ( -6.56386 8.37131 )
Norm@50keV : 1.28287 ( -9.20595 31.4016 )
------------------------------------------------------------
Chi-Squared = 60.13077 using 59 PHA bins.
Reduced chi-squared = 1.073764 for 56 degrees of freedom
Null hypothesis probability = 0.329
Photon flux (15-150 keV) in 2.048 sec: 0.239256 ( -0.083705 0.084622 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.02172e-08 ( -7.66931e-09 9.27048e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.38434 ( )
beta : -6.78026 ( )
Epeak [keV] : 15.7917 ( )
Norm@50keV : 8.045073E-03 ( )
------------------------------------------------------------
Chi-Squared = 61.62445 using 59 PHA bins.
Reduced chi-squared = 1.120445 for 55 degrees of freedom
Null hypothesis probability = 0.251
Photon flux (15-150 keV) in 2.048 sec: 0.243397 ( -0.086609 0.086626 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.01452e-08 ( -7.84032e-09 1.16862e-08 ) ergs/cm2
Plot creation:
Thu Apr 30 11:00:34 EDT 2009