batgrbproduct Analysis for Trigger=359530
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): Mon Aug 10 04:07:58 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger359530/GCN5_download_cron
======================================================================
Trigger: 00359530 Segment: 000
BAT Trigger Time: 271531879.488 [s; MET]
Trigger Stop: 271531883.584 [s; MET]
UTC: 2009-08-09T17:31:14.504600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 328.645008350626 Dec: -0.0832895616909542 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.62
Image Trigger?: NO
Rate S/N Ratio: 10.6770782520313 [ if not an image trigger ]
Image S/N Ratio: 8.62
Flight Position: [ source = BAT ]
RA: 328.645008350626 Dec: -0.0832895616909542 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 328.671571332631 Dec: -0.0884375394345566 [deg; J2000]
{ 21h 54m 41.2s , -00d 05' 18.4" }
+/- 1.98393202334778 [arcmin] (estimated 90% radius based on SNR)
+/- 1.10414078128448 [arcmin] (formal 1-sigma fit error)
SNR: 11.4308917497784
Angular difference between Flight and Ground position is 1.623432 arcmin
Partial Coding Fraction: 0.4335938 [ including projection effects ]
Duration
T90: 5.40799993276596 +/- 1.2162532625235
Measured from: 0.52400016784668
to: 5.93200010061264 [s; relative to TRIGTIME]
T50: 2.11199998855591 +/- 1.08389116109503
Measured from: 1.59200012683868
to: 3.70400011539459 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.26399999856949
to: 3.26399999856949 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.995999991893768
to: 6.40800005197525 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.106801 0.213862 0.156705 0.054149
0.023735 0.025135 0.022223 0.020016 [error]
Peak 0.040565 0.040924 0.046060 0.017991
0.009224 0.009042 0.008491 0.007288 [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 3.81e-08 7.69e-08 1.21e-07 4.20e-07 3.36e-07 6.55e-07 erg/cm2
Error 9.16e-09 1.15e-08 2.12e-08 1.59e-07 5.27e-08 1.74e-07 erg/cm2
Peak flux Power-law 3.25e-01 3.52e-01 2.71e-01 3.41e-01 1.08e+00 1.29e+00 ph/cm2/s
Error 1.18e-01 7.72e-02 6.66e-02 1.80e-01 2.17e-01 2.62e-01 ph/cm2/s
Fluence Cutoff-PL 3.48e-08 8.23e-08 1.25e-07 1.72e-07 3.19e-07 4.14e-07 erg/cm2
Error 1.04e-08 1.44e-08 2.35e-08 2.69e-07 5.90e-08 2.28e-07 erg/cm2
Peak flux Cutoff-PL 3.22e-01 3.53e-01 2.72e-01 3.20e-01 1.01e+00 1.26e+00 ph/cm2/s
Error 1.18e-01 8.22e-02 2.02e-01 3.19e-01 0.00e+00 0.00e+00 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 1.25e+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 1.348 0.235 - - 4.65e-03 6.53e-04 53.020 57
CPL 0.750 0.938 102.5 0.0 9.46e-03 0.00e+00 51.700 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.378 0.361 - - 8.88e-03 1.76e-03 62.370 57
CPL 1.375 1.561 9986.8 0.0 8.92e-03 1.56e-02 62.370 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: 7.296000 sec.
T50 in the 50-300 keV band: 2.560000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 7.404 -0.996 6.408
T90 5.408 0.524 5.932
T50 2.112 1.592 3.704
Peak 1.000 2.264 3.264
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
328.6716 -0.0884 0.0168 27.7 99.2 0.5420 11.4 TRIG_00359530
------------------------------------------
Foreground time interval of the image:
-0.996 6.408 (delta_t = 7.404 [sec])
Background time interval of the image:
-239.488 -55.463 (delta_t = 184.025 [sec])
-54.488 -0.996 (delta_t = 53.492 [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 -0.996 sec. to 6.408 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34794 ( -0.236084 0.233904 )
Norm@50keV : 4.64788E-03 ( -0.000654086 0.000651525 )
------------------------------------------------------------
# Chi-Squared = 53.02 using 59 PHA bins.
# Reduced chi-squared = 0.9301 for 57 degrees of freedom
# Null hypothesis probability = 6.252182e-01
Photon flux (15-150 keV) in 7.404 sec: 0.559697 ( -0.0791257 0.0792598 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.36266e-07 ( -5.23218e-08 5.306e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.996 sec. to 6.408 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.749800 ( -1.11283 0.763058 )
Epeak [keV] : 102.542 ( )
Norm@50keV : 9.45551E-03 ( )
------------------------------------------------------------
# Chi-Squared = 51.70 using 59 PHA bins.
# Reduced chi-squared = 0.9233 for 56 degrees of freedom
# Null hypothesis probability = 6.380672e-01
Photon flux (15-150 keV) in 7.404 sec: 0.546444 ( -0.081569 0.08147 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.19126e-07 ( -5.90624e-08 5.89077e-08 ) ergs/cm2
Band function
Time interval is from -0.996 sec. to 6.408 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.96321 ( -63.9069 -53.9072 )
beta : -1.58125 ( -0.406215 0.303971 )
Epeak [keV] : 30.4689 ( -10.9401 7.36013 )
Norm@50keV : 131.381 ( -138.97 46.6535 )
------------------------------------------------------------
# Chi-Squared = 49.75 using 59 PHA bins.
# Reduced chi-squared = 0.9046 for 55 degrees of freedom
# Null hypothesis probability = 6.747945e-01
Photon flux (15-150 keV) in 7.404 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 2.264 sec. to 3.264 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37807 ( -0.361858 0.360893 )
Norm@50keV : 8.88235E-03 ( -0.00176976 0.00175799 )
------------------------------------------------------------
# Chi-Squared = 62.37 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 57 degrees of freedom
# Null hypothesis probability = 2.911271e-01
Photon flux (15-150 keV) in 1 sec: 1.07644 ( -0.216187 0.217078 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.62208e-08 ( -1.90246e-08 1.93889e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.264 sec. to 3.264 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37472 ( -1.26514 1.85639 )
Epeak [keV] : 9986.79 ( )
Norm@50keV : 8.91574E-03 ( -0.00175746 0.0295249 )
------------------------------------------------------------
# Chi-Squared = 62.37 using 59 PHA bins.
# Reduced chi-squared = 1.114 for 56 degrees of freedom
# Null hypothesis probability = 2.601083e-01
Photon flux (15-150 keV) in 1 sec: 1.00988 ( -0.230223 0.17403 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.0547e-08 ( -2.01363e-08 2.0561e-08 ) ergs/cm2
Band function
Time interval is from 2.264 sec. to 3.264 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.30580 ( -7.10835 0.718355 )
beta : -9.37160 ( 9.99999 20 )
Epeak [keV] : 544.953 ( -545.403 -545.403 )
Norm@50keV : 9.57860E-03 ( -0.00243988 0.0248547 )
------------------------------------------------------------
# Chi-Squared = 62.37 using 59 PHA bins.
# Reduced chi-squared = 1.134 for 55 degrees of freedom
# Null hypothesis probability = 2.307758e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Mon Aug 10 04:41:28 EDT 2009