batgrbproduct Analysis for Trigger=357642
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 17 20:45:08 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger357642/GCN5_download_cron
======================================================================
Trigger: 00357642 Segment: 000
BAT Trigger Time: 269523755.488 [s; MET]
Trigger Stop: 269523755.552 [s; MET]
UTC: 2009-07-17T11:42:30.569640 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 233.5909625089 Dec: 27.3459337800648 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.66
Image Trigger?: NO
Rate S/N Ratio: 6.6332495807108 [ if not an image trigger ]
Image S/N Ratio: 5.66
Flight Position: [ source = BAT ]
RA: 233.5909625089 Dec: 27.3459337800648 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 233.584062389759 Dec: 27.3622031527896 [deg; J2000]
{ 15h 34m 20.2s , +27d 21' 43.9" }
+/- 3.5790190068378 [arcmin] (estimated 90% radius based on SNR)
+/- 2.36542971317717 [arcmin] (formal 1-sigma fit error)
SNR: 4.92070063857681
Angular difference between Flight and Ground position is 1.043124 arcmin
Partial Coding Fraction: 0.9375 [ including projection effects ]
Duration
T90: 0.0640000104904175 +/-
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
T50: 0.0640000104904175 +/-
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.0640000104904175 second)
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.002888 0.009102 -0.001063 0.001954
0.001544 0.001579 0.001220 0.001100 [error]
Peak 0.002888 0.009102 -0.001063 0.001954
0.001544 0.001579 0.001220 0.001100 [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 1.66e-09 1.97e-09 1.68e-09 2.45e-09 6.18e-09 7.76e-09 erg/cm2
Error 6.56e-10 6.12e-10 9.07e-10 3.04e-09 2.18e-09 3.84e-09 erg/cm2
Peak flux Power-law 8.49e-01 5.58e-01 2.39e-01 1.40e-01 1.72e+00 1.79e+00 ph/cm2/s
Error 3.42e-01 1.71e-01 1.25e-01 1.63e-01 5.19e-01 5.39e-01 ph/cm2/s
Fluence Cutoff-PL 1.63e-09 2.84e-09 5.50e-10 5.02e-09 0.00e+00 0.00e+00 erg/cm2
Error 5.91e-10 8.58e-10 4.83e-10 1.45e-09 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 7.84e-01 8.26e-01 9.49e-02 3.00e-04 1.71e+00 1.71e+00 ph/cm2/s
Error 2.97e-01 2.38e-01 7.49e-02 2.40e-03 4.75e-01 4.75e-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 2.225 0.586 - - 1.02e-02 4.14e-03 57.230 57
CPL -4.961 0.000 31.6 4.3 5.50e+02 4.00e+02 50.040 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.225 0.586 - - 1.02e-02 4.14e-03 57.230 57
CPL -4.961 0.000 31.6 4.3 5.50e+02 4.00e+02 50.040 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 0.064 0.000 0.064
T90 0.064 0.000 0.064
T50 0.064 0.000 0.064
Peak 0.064 0.000 0.064
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
233.5841 +27.3622 0.0390 22.5 -179.9 0.0136 4.9 TRIG_00357642
------------------------------------------
Foreground time interval of the image:
0.000 0.064 (delta_t = 0.064 [sec])
Background time interval of the image:
-60.488 -3.488 (delta_t = 57.000 [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 0.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.22490 ( -0.546344 0.625147 )
Norm@50keV : 1.02293E-02 ( -0.00421449 0.00405635 )
------------------------------------------------------------
# Chi-Squared = 57.23 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 57 degrees of freedom
# Null hypothesis probability = 4.663556e-01
Photon flux (15-150 keV) in 0.064 sec: 1.71598 ( -0.518426 0.518695 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.17779e-09 ( -2.12369e-09 2.23954e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.96119 ( )
Epeak [keV] : 31.6022 ( -4.17203 4.47202 )
Norm@50keV : 549.676 ( -549.675 250.412 )
------------------------------------------------------------
# Chi-Squared = 50.04 using 59 PHA bins.
# Reduced chi-squared = 0.8936 for 56 degrees of freedom
# Null hypothesis probability = 6.986311e-01
Photon flux (15-150 keV) in 0.064 sec: 1.70529 ( -0.47344 0.4766 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99950 ( -3856.84 -3841.85 )
beta : -9.37167 ( 10 6.93497 )
Epeak [keV] : 31.4442 ( -4.01584 4.65662 )
Norm@50keV : 607.752 ( -602.269 902.338 )
------------------------------------------------------------
# Chi-Squared = 50.05 using 59 PHA bins.
# Reduced chi-squared = 0.9100 for 55 degrees of freedom
# Null hypothesis probability = 6.638579e-01
Photon flux (15-150 keV) in 0.064 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 0.000 sec. to 0.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.22490 ( -0.546344 0.625147 )
Norm@50keV : 1.02293E-02 ( -0.00421449 0.00405635 )
------------------------------------------------------------
# Chi-Squared = 57.23 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 57 degrees of freedom
# Null hypothesis probability = 4.663556e-01
Photon flux (15-150 keV) in 0.064 sec: 1.71598 ( -0.518426 0.518695 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.17779e-09 ( -2.12369e-09 2.23954e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.96119 ( )
Epeak [keV] : 31.6022 ( -4.17203 4.47202 )
Norm@50keV : 549.676 ( -549.675 250.412 )
------------------------------------------------------------
# Chi-Squared = 50.04 using 59 PHA bins.
# Reduced chi-squared = 0.8936 for 56 degrees of freedom
# Null hypothesis probability = 6.986311e-01
Photon flux (15-150 keV) in 0.064 sec: 1.70529 ( -0.47344 0.4766 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99950 ( -3856.84 -3841.85 )
beta : -9.37167 ( 10 6.93497 )
Epeak [keV] : 31.4442 ( -4.01584 4.65662 )
Norm@50keV : 607.752 ( -602.269 902.338 )
------------------------------------------------------------
# Chi-Squared = 50.05 using 59 PHA bins.
# Reduced chi-squared = 0.9100 for 55 degrees of freedom
# Null hypothesis probability = 6.638579e-01
Photon flux (15-150 keV) in 0.064 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Fri Jul 17 20:57:19 EDT 2009