batgrbproduct Analysis for Trigger=357928
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): Wed Jul 22 17:55:08 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger357928/GCN5_download_cron
======================================================================
Trigger: 00357928 Segment: 000
BAT Trigger Time: 269934043.392 [s; MET]
Trigger Stop: 269934070.272 [s; MET]
UTC: 2009-07-22T05:40:38.460340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 243.857979219505 Dec: 42.7041492654143 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.18
Image Trigger?: NO
Rate S/N Ratio: 18.3575597506858 [ if not an image trigger ]
Image S/N Ratio: 6.18
Flight Position: [ source = BAT ]
RA: 243.857979219505 Dec: 42.7041492654143 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 244.00820913401 Dec: 42.6536535437992 [deg; J2000]
{ 16h 16m 02.0s , +42d 39' 13.2" }
+/- 5.08925533916798 [arcmin] (estimated 90% radius based on SNR)
+/- 3.40784542559556 [arcmin] (formal 1-sigma fit error)
SNR: 2.9758588052475
Angular difference between Flight and Ground position is 7.286386 arcmin
Partial Coding Fraction: 0.7421875 [ including projection effects ]
Duration
T90: 26.8799999952316 +/-
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
T50: 26.8799999952316 +/-
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 26.8799999952316 second)
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.016747 0.007419 0.099886 0.156850
0.034700 0.037359 0.035846 0.036657 [error]
Peak -0.016747 0.007419 0.099886 0.156850
0.034700 0.037359 0.035846 0.036657 [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 1.46e-09 8.07e-09 3.87e-08 7.83e-07 1.22e-07 8.35e-07 erg/cm2
Error 4.86e-09 1.27e-08 3.58e-08 1.58e-06 9.17e-08 1.60e-06 erg/cm2
Peak flux Power-law 1.68e-03 4.95e-03 1.19e-02 7.86e-02 3.21e-02 9.71e-02 ph/cm2/s
Error 5.78e-03 8.10e-03 1.12e-02 1.41e-01 3.08e-02 1.37e-01 ph/cm2/s
Fluence Cutoff-PL 5.36e-10 7.23e-09 4.96e-08 1.61e-07 2.28e-07 0.00e+00 erg/cm2
Error 4.43e-09 1.20e-08 4.22e-08 2.38e-06 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 6.90e-04 4.66e-03 1.56e-02 2.18e-02 3.29e-02 4.18e-02 ph/cm2/s
Error 5.24e-03 7.67e-03 1.40e-02 2.03e-01 2.96e-02 1.79e-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 -0.269 0.654 - - 2.13e-04 2.59e-04 60.660 57
CPL -4.986 0.000 110.3 0.0 5.90e-03 6.11e-03 59.960 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.269 0.654 - - 2.13e-04 2.59e-04 60.660 57
CPL -4.986 0.000 110.3 0.0 5.90e-03 6.11e-03 59.960 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 26.880 0.000 26.880
T90 26.880 0.000 26.880
T50 26.880 0.000 26.880
Peak 26.880 0.000 26.880
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
244.0082 +42.6537 0.0645 32.7 -178.8 0.3384 3.0 TRIG_00357928
------------------------------------------
Foreground time interval of the image:
0.000 26.880 (delta_t = 26.880 [sec])
Background time interval of the image:
-60.392 -43.392 (delta_t = 17.000 [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 26.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.269201 ( 0.267894 1.57598 )
Norm@50keV : 2.13236E-04 ( -0.000213585 0.000305173 )
------------------------------------------------------------
# Chi-Squared = 60.66 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 57 degrees of freedom
# Null hypothesis probability = 3.452905e-01
Photon flux (15-150 keV) in 26.88 sec: 3.21069E-02 ( -0.0321069 0.0294814 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21734e-07 ( -9.17398e-08 9.17573e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.98627 ( )
Epeak [keV] : 110.318 ( -110.325 -110.325 )
Norm@50keV : 5.89887E-03 ( -0.00589469 0.00632091 )
------------------------------------------------------------
# Chi-Squared = 59.96 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 56 degrees of freedom
# Null hypothesis probability = 3.342792e-01
Photon flux (15-150 keV) in 26.88 sec: 3.28778E-02 ( -0.0328778 0.0263334 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -1.82202e+06 -1.82202e+06 )
beta : -1.75700 ( 1.65135 1.65135 )
Epeak [keV] : 108.108 ( -108.039 -108.039 )
Norm@50keV : 6.42539E-03 ( -0.00640445 2912.5 )
------------------------------------------------------------
# Chi-Squared = 59.85 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 55 degrees of freedom
# Null hypothesis probability = 3.040602e-01
Photon flux (15-150 keV) in 26.88 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 26.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.269201 ( 0.267894 1.57598 )
Norm@50keV : 2.13236E-04 ( -0.000213585 0.000305173 )
------------------------------------------------------------
# Chi-Squared = 60.66 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 57 degrees of freedom
# Null hypothesis probability = 3.452905e-01
Photon flux (15-150 keV) in 26.88 sec: 3.21069E-02 ( -0.0321069 0.0294814 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21734e-07 ( -9.17398e-08 9.17573e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.98627 ( )
Epeak [keV] : 110.318 ( -110.325 -110.325 )
Norm@50keV : 5.89887E-03 ( -0.00589469 0.00632091 )
------------------------------------------------------------
# Chi-Squared = 59.96 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 56 degrees of freedom
# Null hypothesis probability = 3.342792e-01
Photon flux (15-150 keV) in 26.88 sec: 3.28778E-02 ( -0.0328778 0.0263334 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -1.82202e+06 -1.82202e+06 )
beta : -1.75700 ( 1.65135 1.65135 )
Epeak [keV] : 108.108 ( -108.039 -108.039 )
Norm@50keV : 6.42539E-03 ( -0.00640445 2912.5 )
------------------------------------------------------------
# Chi-Squared = 59.85 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 55 degrees of freedom
# Null hypothesis probability = 3.040602e-01
Photon flux (15-150 keV) in 26.88 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Wed Jul 22 18:08:19 EDT 2009