batgrbproduct Analysis for Trigger=340973
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 v2.42
Process Start Time (local time): Sat Jan 24 10:05:43 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger340973/GCN5_download_cron
======================================================================
Trigger: 00340973 Segment: 000
BAT Trigger Time: 254451984 [s; MET]
Trigger Stop: 254452048 [s; MET]
UTC: 2009-01-24T01:06:19.559120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 170.291582453064 Dec: -61.9049982688932 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.23
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.23
Flight Position: [ source = BAT ]
RA: 170.291582453064 Dec: -61.9049982688932 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 170.210589365271 Dec: -61.888985758676 [deg; J2000]
{ 11h 20m 50.5s , -61d 53' 20.3" }
+/- 2.78431066915748 [arcmin] (estimated 90% radius based on SNR)
+/- 1.54545045151978 [arcmin] (formal 1-sigma fit error)
SNR: 7.04380609552532
Angular difference between Flight and Ground position is 2.482587 arcmin
Partial Coding Fraction: 0.703125 [ including projection effects ]
Duration
T90: 152.247999995947 +/- 62.1529886606234
Measured from: -35.4679999053478
to: 116.780000090599 [s; relative to TRIGTIME]
T50: 73.4359999895096 +/- 69.3601450949199
Measured from: -8.83599990606308
to: 64.6000000834465 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -35.5879999995232
to: -34.5879999995232 [s; relative to TRIGTIME]
Total Fluence
Measured from: -40.4959999918938
to: 117.772000014782 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.654376 0.579193 -0.006366 0.079058
0.085362 0.082468 0.073875 0.071025 [error]
Peak 0.015792 0.017533 0.015285 0.014468
0.009541 0.009729 0.008194 0.007937 [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 2.17e-07 1.95e-07 1.20e-07 1.13e-07 5.80e-07 6.45e-07 erg/cm2
Error 4.07e-08 4.19e-08 5.07e-08 8.68e-08 1.28e-07 1.76e-07 erg/cm2
Peak flux Power-law 9.83e-02 1.21e-01 1.09e-01 1.68e-01 3.86e-01 4.96e-01 ph/cm2/s
Error 1.19e-01 1.02e-01 8.78e-02 3.56e-01 3.07e-01 3.41e-01 ph/cm2/s
Fluence Cutoff-PL 2.12e-07 2.48e-07 2.73e-08 5.94e-11 4.87e-07 4.87e-07 erg/cm2
Error 4.58e-08 5.89e-08 3.38e-08 1.95e-09 8.99e-08 8.99e-08 erg/cm2
Peak flux Cutoff-PL 9.81e-02 1.21e-01 1.09e-01 1.67e-01 3.86e-01 4.95e-01 ph/cm2/s
Error 1.19e-01 1.02e-01 8.79e-02 3.55e-01 3.07e-01 3.40e-01 ph/cm2/s
Fluence Band 2.22e-07 2.39e-07 2.27e-08 2.56e-10 4.81e-07 5.26e-07 erg/cm2
Error 4.63e-08 5.82e-08 1.32e-08 3.36e-09 9.05e-08 0.00e+00 erg/cm2
Peak flux Band 1.23e-01 1.23e-01 1.09e-01 1.64e-01 3.90e-01 4.71e-01 ph/cm2/s
Error 0.00e+00 1.03e-01 8.80e-02 3.43e-01 3.09e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.694 0.376 - - 3.43e-04 1.10e-04 54.079 57
CPL -1.499 1.888 24.9 4.4 2.83e-01 0.00e+00 44.233 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.159 1.445 - - 3.31e-03 1.99e-03 55.525 57
CPL 1.155 1.457 9999.2 0.0 3.32e-03 5.46e-02 55.528 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 158.268 -40.496 117.772
T90 152.248 -35.468 116.780
T50 73.436 -8.836 64.600
Peak 1.000 -35.588 -34.588
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
170.2106 -61.8890 0.0272 25.9 -53.1 1.0047 7.0 TRIG_00340973
------------------------------------------
Foreground time interval of the image:
-7.899 117.772 (delta_t = 125.671 [sec])
Background time interval of the image:
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 -40.496 sec. to 117.772 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.69394 ( -0.345959 0.405745 )
Norm@50keV : 3.432396E-04 ( -1.059206E-04 1.137280E-04) )
------------------------------------------------------------
Chi-Squared = 54.07948 using 59 PHA bins.
Reduced chi-squared = 0.9487627 for 57 degrees of freedom
Null hypothesis probability = 0.585
Photon flux (15-150 keV) in 158.3 sec: 7.673569E-02 ( -0.0130513 0.013081 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.79513e-07 ( -1.23578e-07 1.3317e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -40.496 sec. to 117.772 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.49884 ( -1.50116 2.27565 )
Epeak [keV] : 24.9288 ( -4.42144 4.32369 )
Norm@50keV : 0.282855 ( )
------------------------------------------------------------
Chi-Squared = 44.23295 using 59 PHA bins.
but latest trial 20.4895 gives Chi-Squared = 4.13774
Reduced chi-squared = 0.7898741 for 56 degrees of freedom
Null hypothesis probability = 0.872
Photon flux (15-150 keV) in 158.3 sec: 7.440045E-02 ( -0.0121751 0.0124428 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.86989e-07 ( -8.57622e-08 9.40492e-08 ) ergs/cm2
Band function
Time interval is from -40.496 sec. to 117.772 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.34326 ( -1.74851 1.67733 )
beta : -5.51048 ( -4.48952 15.5103 )
Epeak [keV] : 15.3613 ( -15.2613 5.35520 )
Norm@50keV : 2.914798E-03 ( -0.331013 45.5868 )
------------------------------------------------------------
Chi-Squared = 48.47948 using 59 PHA bins.
Reduced chi-squared = 0.8814451 for 55 degrees of freedom
Null hypothesis probability = 0.720
Photon flux (15-150 keV) in 158.3 sec: 7.310624E-02 ( -0.0117065 0.0117082 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.81286e-07 ( -8.07045e-08 1.00378e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -35.588 sec. to -34.588 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15874 ( -1.63528 1.25467 )
Norm@50keV : 3.307760E-03 ( -2.140655E-03 1.837824E-03) )
------------------------------------------------------------
Chi-Squared = 55.52526 using 59 PHA bins.
Reduced chi-squared = 0.9741273 for 57 degrees of freedom
Null hypothesis probability = 0.531
Photon flux (15-150 keV) in 1.000 sec: 0.386145 ( -0.386145 0.228854 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.39335e-08 ( -3.39335e-08 2.12042e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -35.588 sec. to -34.588 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15465 ( -1.65215 1.26127 )
Epeak [keV] : 9999.25 ( )
Norm@50keV : 3.324097E-03 ( -1.114247E-03 0.107986 )
------------------------------------------------------------
Chi-Squared = 55.52780 using 59 PHA bins.
Reduced chi-squared = 0.9915679 for 56 degrees of freedom
Null hypothesis probability = 0.493
Photon flux (15-150 keV) in 1.000 sec: 0.385959 ( -0.385959 0.228785 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.39603e-08 ( -3.39603e-08 2.11926e-08 ) ergs/cm2
Band function
Time interval is from -35.588 sec. to -34.588 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.872358 ( -9.12764 5.87236 )
beta : -1.17508 ( -8.82492 1.65069 )
Epeak [keV] : 78.7061 ( -78.6061 9921.29 )
Norm@50keV : 5.818483E-03 ( -32.9583 824.844 )
------------------------------------------------------------
Chi-Squared = 55.52106 using 59 PHA bins.
Reduced chi-squared = 1.009474 for 55 degrees of freedom
Null hypothesis probability = 0.455
Photon flux (15-150 keV) in 1.000 sec: 0.390103 ( -0.390103 0.228852 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05496e-07 ( -1.05496e-07 6.72949e-06 ) ergs/cm2
Plot creation:
Sat Jan 24 10:35:40 EST 2009