batgrbproduct Analysis for Trigger=373674
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): Sat Oct 24 16:54:05 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger373674/GCN5_download_cron
======================================================================
Trigger: 00373674 Segment: 000
BAT Trigger Time: 278067366.464 [s; MET]
Trigger Stop: 278067367.488 [s; MET]
UTC: 2009-10-24T08:56:01.265340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 339.206654153892 Dec: 56.8745686910293 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.06
Image Trigger?: NO
Rate S/N Ratio: 19.3907194296653 [ if not an image trigger ]
Image S/N Ratio: 9.06
Flight Position: [ source = BAT ]
RA: 339.206654153892 Dec: 56.8745686910293 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 339.239698949498 Dec: 56.8856390434968 [deg; J2000]
{ 22h 36m 57.5s , +56d 53' 08.3" }
+/- 0.961362660804899 [arcmin] (estimated 90% radius based on SNR)
+/- 0.301998485204878 [arcmin] (formal 1-sigma fit error)
SNR: 32.1784533086475
Angular difference between Flight and Ground position is 1.270742 arcmin
Partial Coding Fraction: 0.390625 [ including projection effects ]
Duration
T90: 98.9359999299049 +/- 13.7949598158634
Measured from: -5.7199998497963
to: 93.2160000801086 [s; relative to TRIGTIME]
T50: 47.311999976635 +/- 4.58444546492443
Measured from: 4.22800010442734
to: 51.5400000810623 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.23199999332428
to: 0.76800000667572 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.2039999961853
to: 135.815999984741 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.695173 2.849473 2.799803 1.161046
0.112397 0.118433 0.107458 0.095799 [error]
Peak 0.055386 0.071375 0.086789 0.065337
0.009486 0.010961 0.010409 0.009109 [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 5.84e-07 1.29e-06 2.23e-06 8.98e-06 6.10e-06 1.31e-05 erg/cm2
Error 5.43e-08 6.98e-08 1.02e-07 9.83e-07 2.63e-07 1.02e-06 erg/cm2
Peak flux Power-law 4.34e-01 6.06e-01 6.27e-01 1.19e+00 2.04e+00 2.86e+00 ph/cm2/s
Error 1.34e-01 1.11e-01 7.93e-02 3.59e-01 2.78e-01 3.75e-01 ph/cm2/s
Fluence Cutoff-PL 5.83e-07 1.29e-06 2.23e-06 8.92e-06 6.10e-06 1.28e-05 erg/cm2
Error 5.43e-08 6.99e-08 1.02e-07 9.77e-07 2.64e-07 6.58e-07 erg/cm2
Peak flux Cutoff-PL 4.33e-01 6.06e-01 6.28e-01 1.18e+00 2.04e+00 2.85e+00 ph/cm2/s
Error 1.34e-01 1.11e-01 7.94e-02 3.57e-01 2.78e-01 3.74e-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 1.206 0.078 - - 3.99e-03 1.71e-04 42.920 57
CPL 1.205 0.079 9999.4 0.0 4.01e-03 3.53e-04 43.010 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.951 0.248 - - 1.78e-02 2.37e-03 54.620 57
CPL 0.945 0.251 10000.0 0.0 1.79e-02 2.38e-03 54.680 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: 67.840000 sec.
T50 in the 50-300 keV band: 39.040000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 151.020 -15.204 135.816
T90 98.936 -5.720 93.216
T50 47.312 4.228 51.540
Peak 1.000 -0.232 0.768
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
339.2397 +56.8856 0.0060 44.4 179.7 9.2800 32.2 TRIG_00373674
------------------------------------------
Foreground time interval of the image:
-15.204 135.816 (delta_t = 151.020 [sec])
Background time interval of the image:
-237.663 -15.204 (delta_t = 222.459 [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 -15.204 sec. to 135.816 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20561 ( -0.078972 0.0780248 )
Norm@50keV : 3.98901E-03 ( -0.000171069 0.000170375 )
------------------------------------------------------------
# Chi-Squared = 42.92 using 59 PHA bins.
# Reduced chi-squared = 0.7530 for 57 degrees of freedom
# Null hypothesis probability = 9.165212e-01
Photon flux (15-150 keV) in 151 sec: 0.468603 ( -0.0218733 0.0219478 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.10135e-06 ( -2.63187e-07 2.63641e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.204 sec. to 135.816 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20497 ( -0.0833742 0.0750012 )
Epeak [keV] : 9999.36 ( -10000 -10000 )
Norm@50keV : 4.00979E-03 ( -0.000170366 0.000535943 )
------------------------------------------------------------
# Chi-Squared = 43.01 using 59 PHA bins.
# Reduced chi-squared = 0.7681 for 56 degrees of freedom
# Null hypothesis probability = 8.984739e-01
Photon flux (15-150 keV) in 151 sec: 0.468387 ( -0.021861 0.021941 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.103e-06 ( -2.63314e-07 2.63767e-07 ) ergs/cm2
Band function
Time interval is from -15.204 sec. to 135.816 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.929688 ( 0.929819 0.929819 )
beta : -1.20560 ( 1.2056 0.0789901 )
Epeak [keV] : 55.0021 ( -54.831 530.947 )
Norm@50keV : 7.44241E-03 ( -0.00362385 0 )
------------------------------------------------------------
# Chi-Squared = 42.92 using 59 PHA bins.
# Reduced chi-squared = 0.7804 for 55 degrees of freedom
# Null hypothesis probability = 8.817326e-01
Photon flux (15-150 keV) in 151 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 -0.232 sec. to 0.768 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.950585 ( -0.256187 0.239504 )
Norm@50keV : 1.77866E-02 ( -0.00240849 0.00233684 )
------------------------------------------------------------
# Chi-Squared = 54.62 using 59 PHA bins.
# Reduced chi-squared = 0.9582 for 57 degrees of freedom
# Null hypothesis probability = 5.649533e-01
Photon flux (15-150 keV) in 1 sec: 2.04346 ( -0.277539 0.27864 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.95816e-07 ( -2.50247e-08 2.50455e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.232 sec. to 0.768 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.944552 ( -0.27836 0.223186 )
Epeak [keV] : 10000.00 ( )
Norm@50keV : 1.78979E-02 ( -0.00241235 0.00234288 )
------------------------------------------------------------
# Chi-Squared = 54.68 using 59 PHA bins.
# Reduced chi-squared = 0.9764 for 56 degrees of freedom
# Null hypothesis probability = 5.250974e-01
Photon flux (15-150 keV) in 1 sec: 2.04256 ( -0.27756 0.27851 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.95876e-07 ( -2.5041e-08 2.5063e-08 ) ergs/cm2
Band function
Time interval is from -0.232 sec. to 0.768 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.846366 ( 0.846339 0.846339 )
beta : -0.950614 ( -0.239498 0.256159 )
Epeak [keV] : 22.9163 ( -22.9006 -22.9006 )
Norm@50keV : 2.75128E-02 ( -0.0119575 5309.61 )
------------------------------------------------------------
# Chi-Squared = 54.62 using 59 PHA bins.
# Reduced chi-squared = 0.9931 for 55 degrees of freedom
# Null hypothesis probability = 4.891586e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Sat Oct 24 17:16:40 EDT 2009