batgrbproduct Analysis for Trigger=373172
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 Oct 19 17:15:30 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger373172/GCN5_download_cron
======================================================================
Trigger: 00373172 Segment: 000
BAT Trigger Time: 277591704.768 [s; MET]
Trigger Stop: 277591705.024 [s; MET]
UTC: 2009-10-18T20:48:19.585200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 32.2106435093656 Dec: -57.526501145527 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.47
Image Trigger?: NO
Rate S/N Ratio: 29.7153159162073 [ if not an image trigger ]
Image S/N Ratio: 11.47
Flight Position: [ source = BAT ]
RA: 32.2106435093656 Dec: -57.526501145527 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 32.1912358849224 Dec: -57.5458317884792 [deg; J2000]
{ 02h 08m 45.9s , -57d 32' 45.0" }
+/- 0.606397302059854 [arcmin] (estimated 90% radius based on SNR)
+/- 0.196467029089251 [arcmin] (formal 1-sigma fit error)
SNR: 62.1534371885533
Angular difference between Flight and Ground position is 1.317537 arcmin
Partial Coding Fraction: 0.84375 [ including projection effects ]
Duration
T90: 4.35999995470047 +/- 0.601065703889731
Measured from: 0.240000128746033
to: 4.6000000834465 [s; relative to TRIGTIME]
T50: 1.55999994277954 +/- 0.0751531959722141
Measured from: 0.996000111103058
to: 2.5560000538826 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.800000011920929
to: 1.80000001192093 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.26800000667572
to: 7.74799996614456 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.290942 1.219699 0.481361 0.073603
0.022128 0.022432 0.018422 0.016648 [error]
Peak 0.441759 0.485931 0.203511 0.028158
0.010891 0.011362 0.008539 0.006129 [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 4.30e-07 4.86e-07 3.94e-07 5.32e-07 1.50e-06 1.84e-06 erg/cm2
Error 2.15e-08 1.40e-08 1.89e-08 5.39e-08 4.38e-08 7.04e-08 erg/cm2
Peak flux Power-law 5.01e+00 3.36e+00 1.47e+00 8.89e-01 1.03e+01 1.07e+01 ph/cm2/s
Error 2.75e-01 1.14e-01 7.32e-02 8.72e-02 3.75e-01 3.71e-01 ph/cm2/s
Fluence Cutoff-PL 3.95e-07 5.05e-07 3.85e-07 2.37e-07 1.42e-06 1.52e-06 erg/cm2
Error 2.68e-08 1.70e-08 2.11e-08 9.07e-08 5.79e-08 1.13e-07 erg/cm2
Peak flux Cutoff-PL 4.35e+00 3.61e+00 1.48e+00 3.45e-01 9.70e+00 9.79e+00 ph/cm2/s
Error 3.33e-01 1.41e-01 8.33e-02 1.04e-01 4.10e-01 4.31e-01 ph/cm2/s
Fluence Band 3.67e-07 5.13e-07 3.73e-07 4.15e-07 1.42e-06 1.68e-06 erg/cm2
Error 2.81e-08 1.93e-08 1.99e-08 5.00e-08 5.05e-08 9.70e-08 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 2.304 0.062 - - 1.96e-02 6.60e-04 52.330 57
CPL 1.765 0.242 19.2 0.0 3.83e-02 0.00e+00 40.070 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.191 0.064 - - 6.24e-02 2.36e-03 86.870 57
CPL 1.296 0.306 35.2 5.0 1.90e-01 7.43e-02 56.120 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: 3.840000 sec.
T50 in the 50-300 keV band: 1.280000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 8.016 -0.268 7.748
T90 4.360 0.240 4.600
T50 1.560 0.996 2.556
Peak 1.000 0.800 1.800
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
32.1912 -57.5458 0.0031 15.9 107.0 3.1804 62.2 TRIG_00373172
------------------------------------------
Foreground time interval of the image:
-0.268 7.748 (delta_t = 8.016 [sec])
Background time interval of the image:
-194.667 -0.268 (delta_t = 194.399 [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 -0.268 sec. to 7.748 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.30354 ( -0.0616036 0.0622771 )
Norm@50keV : 1.96299E-02 ( -0.000661343 0.000657716 )
------------------------------------------------------------
# Chi-Squared = 52.33 using 59 PHA bins.
# Reduced chi-squared = 0.9182 for 57 degrees of freedom
# Null hypothesis probability = 6.504464e-01
Photon flux (15-150 keV) in 8.016 sec: 3.43727 ( -0.112773 0.113476 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50468e-06 ( -4.38118e-08 4.38719e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.268 sec. to 7.748 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76470 ( -0.291144 0.193777 )
Epeak [keV] : 19.1867 ( )
Norm@50keV : 3.83108E-02 ( )
------------------------------------------------------------
# Chi-Squared = 40.07 using 59 PHA bins.
# Reduced chi-squared = 0.7156 for 56 degrees of freedom
# Null hypothesis probability = 9.465684e-01
Photon flux (15-150 keV) in 8.016 sec: 3.28319 ( -0.13285 0.13377 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.42328e-06 ( -5.76431e-08 5.8132e-08 ) ergs/cm2
Band function
Time interval is from -0.268 sec. to 7.748 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.78455 ( -0.17658 0.305182 )
beta : -10.00000 ( 1.67886e+11 1.67886e+11 )
Epeak [keV] : 18.1856 ( -17.2666 10.4475 )
Norm@50keV : 3.74240E-02 ( -0.00969952 0.0173407 )
------------------------------------------------------------
# Chi-Squared = 40.09 using 59 PHA bins.
# Reduced chi-squared = 0.7289 for 55 degrees of freedom
# Null hypothesis probability = 9.345126e-01
Photon flux (15-150 keV) in 8.016 sec: 3.22303 ( 3.77697 -0.14384 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.42176e-06 ( -1.4217e-06 -5.18395e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.800 sec. to 1.800 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.19099 ( -0.0631194 0.0639419 )
Norm@50keV : 6.23649E-02 ( -0.00236312 0.00235084 )
------------------------------------------------------------
# Chi-Squared = 86.87 using 59 PHA bins.
# Reduced chi-squared = 1.524 for 57 degrees of freedom
# Null hypothesis probability = 6.581552e-03
Photon flux (15-150 keV) in 1 sec: 10.2761 ( -0.374042 0.375344 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.85629e-07 ( -2.01796e-08 2.0213e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.800 sec. to 1.800 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29599 ( -0.317354 0.295169 )
Epeak [keV] : 35.1551 ( -5.9348 4.10483 )
Norm@50keV : 0.189554 ( -0.0574571 0.091117 )
------------------------------------------------------------
# Chi-Squared = 56.12 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 56 degrees of freedom
# Null hypothesis probability = 4.703415e-01
Photon flux (15-150 keV) in 1 sec: 9.70339 ( -0.40865 0.41051 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.45004e-07 ( -2.3286e-08 2.3479e-08 ) ergs/cm2
Band function
Time interval is from 0.800 sec. to 1.800 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.476865 ( -0.932182 2.63008 )
beta : -2.57249 ( 2.57039 0.193948 )
Epeak [keV] : 33.2598 ( -4.5627 4.37249 )
Norm@50keV : 0.651837 ( -0.486816 56.1084 )
------------------------------------------------------------
# Chi-Squared = 53.48 using 59 PHA bins.
# Reduced chi-squared = 0.9724 for 55 degrees of freedom
# Null hypothesis probability = 5.328095e-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 Oct 19 17:51:39 EDT 2009