batgrbproduct Analysis for Trigger=358520
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): Tue Jul 28 09:54:13 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger358520/GCN5_download_cron
======================================================================
Trigger: 00358520 Segment: 000
BAT Trigger Time: 270427342.976 [s; MET]
Trigger Stop: 270427345.024 [s; MET]
UTC: 2009-07-27T22:42:18.028360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 315.97210799452 Dec: 64.9160517614425 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.11
Image Trigger?: NO
Rate S/N Ratio: 7.48331477354788 [ if not an image trigger ]
Image S/N Ratio: 8.11
Flight Position: [ source = BAT ]
RA: 315.97210799452 Dec: 64.9160517614425 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 315.916521336231 Dec: 64.9368562773551 [deg; J2000]
{ 21h 03m 40.0s , +64d 56' 12.7" }
+/- 2.18541185558167 [arcmin] (estimated 90% radius based on SNR)
+/- 1.37958397890175 [arcmin] (formal 1-sigma fit error)
SNR: 9.95567741427091
Angular difference between Flight and Ground position is 1.885700 arcmin
Partial Coding Fraction: 0.8359375 [ including projection effects ]
Duration
T90: 301.811999976635 +/- 22.9451398031511
Measured from: 0.892000079154968
to: 302.70400005579 [s; relative to TRIGTIME]
T50: 245.195999979973 +/- 134.747247934184
Measured from: 12.1280000805855
to: 257.324000060558 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.11599999666214
to: 1.11599999666214 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.3400000333786
to: 318.884000003338 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.568211 0.654993 0.728441 0.161011
0.093053 0.098104 0.090996 0.089331 [error]
Peak 0.017534 0.024125 0.023153 0.016787
0.005651 0.006139 0.005850 0.005495 [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 1.44e-07 3.09e-07 5.23e-07 2.03e-06 1.44e-06 3.01e-06 erg/cm2
Error 3.58e-08 4.57e-08 8.95e-08 7.88e-07 2.24e-07 8.47e-07 erg/cm2
Peak flux Power-law 1.41e-01 1.66e-01 1.41e-01 2.02e-01 5.20e-01 6.49e-01 ph/cm2/s
Error 7.32e-02 5.11e-02 4.91e-02 1.61e-01 1.42e-01 1.99e-01 ph/cm2/s
Fluence Cutoff-PL 1.38e-07 3.15e-07 5.32e-07 1.51e-06 1.42e-06 2.49e-06 erg/cm2
Error 4.23e-08 5.23e-08 9.78e-08 1.44e-06 2.40e-07 1.26e-06 erg/cm2
Peak flux Cutoff-PL 1.41e-01 1.66e-01 1.41e-01 2.00e-01 5.20e-01 6.48e-01 ph/cm2/s
Error 7.32e-02 5.11e-02 4.92e-02 1.60e-01 1.42e-01 1.98e-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 1.241 0.245 - - 4.48e-04 6.03e-05 57.470 57
CPL 0.920 0.762 175.5 0.0 6.41e-04 6.96e-04 57.400 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.240 0.544 - - 4.40e-03 1.21e-03 65.320 57
CPL 1.256 0.547 9999.4 0.0 4.41e-03 6.85e-03 65.320 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: 8.640000 sec.
T50 in the 50-300 keV band: 4.800000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 320.224 -1.340 318.884
T90 301.812 0.892 302.704
T50 245.196 12.128 257.324
Peak 1.000 0.116 1.116
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
315.9165 +64.9369 0.0194 21.1 147.1 0.7322 10.0 TRIG_00358520
------------------------------------------
Foreground time interval of the image:
-1.340 29.025 (delta_t = 30.365 [sec])
Background time interval of the image:
-82.675 -1.340 (delta_t = 81.335 [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 -1.340 sec. to 318.884 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24118 ( -0.245636 0.243389 )
Norm@50keV : 4.47527E-04 ( -6.03951e-05 6.02784e-05 )
------------------------------------------------------------
# Chi-Squared = 57.47 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 57 degrees of freedom
# Null hypothesis probability = 4.575015e-01
Photon flux (15-150 keV) in 320.2 sec: 5.28555E-02 ( -0.00718145 0.00719461 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43746e-06 ( -2.22033e-07 2.25798e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.340 sec. to 318.884 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.919891 ( -0.967329 0.555945 )
Epeak [keV] : 175.488 ( -176.788 -176.788 )
Norm@50keV : 6.40654E-04 ( -0.000246931 0.00114584 )
------------------------------------------------------------
# Chi-Squared = 57.40 using 59 PHA bins.
# Reduced chi-squared = 1.025 for 56 degrees of freedom
# Null hypothesis probability = 4.231322e-01
Photon flux (15-150 keV) in 320.2 sec: 5.23489E-02 ( -0.00761 0.007343 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41614e-06 ( -2.47393e-07 2.32174e-07 ) ergs/cm2
Band function
Time interval is from -1.340 sec. to 318.884 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.919759 ( 0.943511 0.943511 )
beta : -1.55262 ( 1.51645 2.12383 )
Epeak [keV] : 172.193 ( -173.134 -173.134 )
Norm@50keV : 6.43650E-04 ( -0.000210329 0 )
------------------------------------------------------------
# Chi-Squared = 57.38 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 55 degrees of freedom
# Null hypothesis probability = 3.871342e-01
Photon flux (15-150 keV) in 320.2 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 0.116 sec. to 1.116 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24034 ( -0.55 0.537045 )
Norm@50keV : 4.40099E-03 ( -0.00122428 0.00120558 )
------------------------------------------------------------
# Chi-Squared = 65.32 using 59 PHA bins.
# Reduced chi-squared = 1.146 for 57 degrees of freedom
# Null hypothesis probability = 2.102282e-01
Photon flux (15-150 keV) in 1 sec: 0.519713 ( -0.141827 0.142095 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.41595e-08 ( -1.41852e-08 1.46907e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.116 sec. to 1.116 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25557 ( -0.571775 0.523065 )
Epeak [keV] : 9999.36 ( -9999.7 -9999.7 )
Norm@50keV : 4.41037E-03 ( -0.00122611 0.0124772 )
------------------------------------------------------------
# Chi-Squared = 65.32 using 59 PHA bins.
# Reduced chi-squared = 1.167 for 56 degrees of freedom
# Null hypothesis probability = 1.844114e-01
Photon flux (15-150 keV) in 1 sec: 0.519503 ( -0.141784 0.142053 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.41561e-08 ( -1.41882e-08 1.47023e-08 ) ergs/cm2
Band function
Time interval is from 0.116 sec. to 1.116 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.909391 ( 0.909475 0.909475 )
beta : -1.24627 ( 1.2463 0.555074 )
Epeak [keV] : 76.9618 ( -76.8306 -76.8306 )
Norm@50keV : 7.92940E-03 ( -0.00793225 15.072 )
------------------------------------------------------------
# Chi-Squared = 65.31 using 59 PHA bins.
# Reduced chi-squared = 1.188 for 55 degrees of freedom
# Null hypothesis probability = 1.609328e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Tue Jul 28 10:29:51 EDT 2009