batgrbproduct Analysis for Trigger=371050
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 Sep 29 14:27:06 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger371050/GCN5_download_cron
======================================================================
Trigger: 00371050 Segment: 000
BAT Trigger Time: 275911752.384 [s; MET]
Trigger Stop: 275911752.64 [s; MET]
UTC: 2009-09-29T10:09:07.257040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 117.704966660118 Dec: -0.632291942744759 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.72
Image Trigger?: NO
Rate S/N Ratio: 13.228756555323 [ if not an image trigger ]
Image S/N Ratio: 7.72
Flight Position: [ source = BAT ]
RA: 117.704966660118 Dec: -0.632291942744759 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 117.711933838573 Dec: -0.644770919048679 [deg; J2000]
{ 07h 50m 50.9s , -00d 38' 41.2" }
+/- 1.44658883170846 [arcmin] (estimated 90% radius based on SNR)
+/- 0.547924775249832 [arcmin] (formal 1-sigma fit error)
SNR: 17.949565501088
Angular difference between Flight and Ground position is 0.857518 arcmin
Partial Coding Fraction: 0.6328125 [ including projection effects ]
Duration
T90: 357.507999956608 +/- 7.34479544262589
Measured from: -2.20399987697601
to: 355.304000079632 [s; relative to TRIGTIME]
T50: 231.711999952793 +/- 5.51294222630647
Measured from: 19.1800001263618
to: 250.892000079155 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 30.6719999909401
to: 31.6719999909401 [s; relative to TRIGTIME]
Total Fluence
Measured from: -9.783999979496
to: 370.995999991894 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.406490 3.832222 2.356886 0.431866
0.116040 0.124191 0.119120 0.130558 [error]
Peak 0.063103 0.150757 0.150454 0.050693
0.007170 0.008488 0.008581 0.007843 [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 1.14e-06 1.69e-06 1.88e-06 3.94e-06 5.89e-06 8.64e-06 erg/cm2
Error 8.11e-08 7.01e-08 1.21e-07 5.46e-07 2.72e-07 6.40e-07 erg/cm2
Peak flux Power-law 7.25e-01 9.94e-01 1.01e+00 1.85e+00 3.32e+00 4.57e+00 ph/cm2/s
Error 9.11e-02 7.63e-02 6.66e-02 2.63e-01 2.08e-01 3.10e-01 ph/cm2/s
Fluence Cutoff-PL 1.10e-06 1.72e-06 1.88e-06 2.77e-06 5.76e-06 7.46e-06 erg/cm2
Error 9.98e-08 8.28e-08 9.35e-08 1.32e-06 3.32e-07 1.23e-06 erg/cm2
Peak flux Cutoff-PL 6.62e-01 1.02e+00 1.05e+00 1.25e+00 3.27e+00 3.99e+00 ph/cm2/s
Error 1.12e-01 8.38e-02 8.33e-02 5.40e-01 2.13e-01 4.09e-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 1.847 0.084 - - 1.68e-03 7.66e-05 55.910 57
CPL 1.590 0.313 75.3 -27.9 2.28e-03 8.22e-04 54.670 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.984 0.105 - - 2.88e-02 1.78e-03 50.100 57
CPL 0.606 0.428 208.5 -61.8 4.29e-02 1.96e-02 47.620 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: 41.792000 sec.
T50 in the 50-300 keV band: 17.856000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 380.780 -9.784 370.996
T90 357.508 -2.204 355.304
T50 231.712 19.180 250.892
Peak 1.000 30.672 31.672
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
117.7119 -0.6448 0.0107 35.2 177.5 1.2434 17.9 TRIG_00371050
------------------------------------------
Foreground time interval of the image:
-9.784 10.217 (delta_t = 20.001 [sec])
Background time interval of the image:
-239.384 -9.784 (delta_t = 229.600 [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 -9.784 sec. to 370.996 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84744 ( -0.0830897 0.0842593 )
Norm@50keV : 1.68351E-03 ( -7.69066e-05 7.63539e-05 )
------------------------------------------------------------
# Chi-Squared = 55.91 using 59 PHA bins.
# Reduced chi-squared = 0.9810 for 57 degrees of freedom
# Null hypothesis probability = 5.158570e-01
Photon flux (15-150 keV) in 380.8 sec: 0.236390 ( -0.0101298 0.0101576 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.89486e-06 ( -2.70592e-07 2.72473e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.784 sec. to 370.996 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59010 ( -0.310408 0.31602 )
Epeak [keV] : 75.2567 ( -20.0365 -75.8244 )
Norm@50keV : 2.28391E-03 ( -0.000634568 0.00101042 )
------------------------------------------------------------
# Chi-Squared = 54.67 using 59 PHA bins.
# Reduced chi-squared = 0.9763 for 56 degrees of freedom
# Null hypothesis probability = 5.252191e-01
Photon flux (15-150 keV) in 380.8 sec: 0.232573 ( -0.011523 0.011162 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.76402e-06 ( -3.34419e-07 3.29125e-07 ) ergs/cm2
Band function
Time interval is from -9.784 sec. to 370.996 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.64822 ( -0.184335 0.313993 )
beta : -9.37157 ( 9.99992 19.9999 )
Epeak [keV] : 84.1581 ( -26.4587 -83.9289 )
Norm@50keV : 2.13196E-03 ( -0.000502611 0.000536513 )
------------------------------------------------------------
# Chi-Squared = 54.64 using 59 PHA bins.
# Reduced chi-squared = 0.9934 for 55 degrees of freedom
# Null hypothesis probability = 4.885159e-01
Photon flux (15-150 keV) in 380.8 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 30.672 sec. to 31.672 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.983683 ( -0.106214 0.104347 )
Norm@50keV : 2.88349E-02 ( -0.0017842 0.00178107 )
------------------------------------------------------------
# Chi-Squared = 50.10 using 59 PHA bins.
# Reduced chi-squared = 0.8789 for 57 degrees of freedom
# Null hypothesis probability = 7.296063e-01
Photon flux (15-150 keV) in 1 sec: 3.31701 ( -0.208008 0.208516 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.13627e-07 ( -2.09173e-08 2.09888e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 30.672 sec. to 31.672 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.606267 ( -0.450971 0.405148 )
Epeak [keV] : 208.502 ( -84.9659 -208.502 )
Norm@50keV : 4.28656E-02 ( -0.0144255 0.0247571 )
------------------------------------------------------------
# Chi-Squared = 47.62 using 59 PHA bins.
# Reduced chi-squared = 0.8503 for 56 degrees of freedom
# Null hypothesis probability = 7.798569e-01
Photon flux (15-150 keV) in 1 sec: 3.27490 ( -0.2129 0.21279 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.07998e-07 ( -2.233e-08 2.2092e-08 ) ergs/cm2
Band function
Time interval is from 30.672 sec. to 31.672 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.34780 ( -3.08955 -3.16992 )
beta : -1.12739 ( -0.160891 0.151726 )
Epeak [keV] : 40.9526 ( -7.60433 112.524 )
Norm@50keV : 4.30883 ( -4.30883 149.542 )
------------------------------------------------------------
# Chi-Squared = 44.27 using 59 PHA bins.
# Reduced chi-squared = 0.8049 for 55 degrees of freedom
# Null hypothesis probability = 8.493366e-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 Sep 29 14:53:46 EDT 2009