batgrbproduct Analysis for Trigger=341452
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): Thu Jan 29 13:44:34 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger341452/GCN5_download_cron
======================================================================
Trigger: 00341452 Segment: 000
BAT Trigger Time: 254903592 [s; MET]
Trigger Stop: 254903912 [s; MET]
UTC: 2009-01-29T06:33:07.545200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 252.047839106946 Dec: -45.2356927497954 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 10.68
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.68
Flight Position: [ source = BAT ]
RA: 252.047839106946 Dec: -45.2356927497954 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 251.960458862193 Dec: -45.2368075079326 [deg; J2000]
{ 16h 47m 50.5s , -45d 14' 12.5" }
+/- 2.94453427425307 [arcmin] (estimated 90% radius based on SNR)
+/- 1.83896367857053 [arcmin] (formal 1-sigma fit error)
SNR: 6.5027138871473
Angular difference between Flight and Ground position is 3.692518 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 325.295999974012 +/- 54.3540605981251
Measured from: -17.9439999163151
to: 307.352000057697 [s; relative to TRIGTIME]
T50: 170.063999980688 +/- 75.8388004171411
Measured from: 53.4000000953674
to: 223.464000076056 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 198.555999994278
to: 199.555999994278 [s; relative to TRIGTIME]
Total Fluence
Measured from: -40.7439999878407
to: 332.296000003815 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.295195 1.119996 0.342535 0.016604
0.108210 0.098832 0.083981 0.071922 [error]
Peak 0.006669 0.015025 0.011008 0.007378
0.005667 0.005267 0.004281 0.003689 [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 3.66e-07 4.09e-07 3.27e-07 4.34e-07 1.26e-06 1.53e-06 erg/cm2
Error 5.25e-08 4.64e-08 7.34e-08 1.87e-07 1.66e-07 2.80e-07 erg/cm2
Peak flux Power-law 5.36e-02 6.88e-02 6.45e-02 1.07e-01 2.23e-01 2.93e-01 ph/cm2/s
Error 5.95e-02 5.55e-02 4.88e-02 1.62e-01 1.14e-01 1.55e-01 ph/cm2/s
Fluence Cutoff-PL 3.44e-07 4.51e-07 2.81e-07 7.99e-08 1.14e-06 1.16e-06 erg/cm2
Error 5.99e-08 8.24e-08 9.81e-08 2.56e-07 1.94e-07 3.44e-07 erg/cm2
Peak flux Cutoff-PL 5.32e-02 6.87e-02 6.45e-02 1.06e-01 2.23e-01 2.81e-01 ph/cm2/s
Error 5.95e-02 4.39e-02 4.88e-02 1.61e-01 1.14e-01 2.29e-01 ph/cm2/s
Fluence Band 3.42e-07 4.47e-07 2.84e-07 1.83e-07 1.17e-06 1.26e-06 erg/cm2
Error 5.69e-08 6.18e-08 8.49e-08 2.50e-07 1.62e-07 3.93e-07 erg/cm2
Peak flux Band 4.70e-02 7.49e-02 6.55e-02 9.09e-02 2.15e-01 3.00e-01 ph/cm2/s
Error 4.42e-02 5.62e-02 3.75e-02 1.16e-01 1.77e-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 2.323 0.231 - - 3.52e-04 5.70e-05 50.755 57
CPL 1.458 1.076 23.3 16.9 1.20e-03 6.05e-03 48.538 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.093 1.043 - - 1.92e-03 9.74e-04 59.932 57
CPL 0.744 3.254 185.6 0.0 2.81e-03 1.44e-03 59.974 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 373.040 -40.744 332.296
T90 325.296 -17.944 307.352
T50 170.064 53.400 223.464
Peak 1.000 198.556 199.556
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
251.9605 -45.2368 0.0297 12.9 -133.4 1.8802 6.5 TRIG_00341452
------------------------------------------
Foreground time interval of the image:
-40.744 332.296 (delta_t = 373.040 [sec])
Background time interval of the image:
-239.000 -40.744 (delta_t = 198.256 [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 -40.744 sec. to 332.296 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.32306 ( -0.221743 0.239277 )
Norm@50keV : 3.524881E-04 ( -5.747739E-05 5.650712E-05) )
------------------------------------------------------------
Chi-Squared = 50.75511 using 59 PHA bins.
Reduced chi-squared = 0.8904406 for 57 degrees of freedom
Null hypothesis probability = 0.707
Photon flux (15-150 keV) in 373.0 sec: 6.240034E-02 ( -0.00663777 0.00663926 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.2619e-06 ( -1.63124e-07 1.68585e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -40.744 sec. to 332.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45826 ( -1.61196 0.539546 )
Epeak [keV] : 23.3032 ( -23.2932 10.5223 )
Norm@50keV : 1.201176E-03 ( -1.201176E-03 1.089936E-02) )
------------------------------------------------------------
Chi-Squared = 48.53837 using 59 PHA bins.
Reduced chi-squared = 0.8667566 for 56 degrees of freedom
Null hypothesis probability = 0.750
Photon flux (15-150 keV) in 373.0 sec: 5.990309E-02 ( -0.00710491 0.00716923 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13744e-06 ( -1.75791e-07 2.11912e-07 ) ergs/cm2
Band function
Time interval is from -40.744 sec. to 332.296 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.32681 ( -8.67319 2.30473 )
beta : -9.01495 ( -6.77448 0.935138 )
Epeak [keV] : 25.7197 ( -25.1438 18.4480 )
Norm@50keV : 1.416254E-03 ( -1.446051E-03 4.219579E-02) )
------------------------------------------------------------
Chi-Squared = 48.52389 using 59 PHA bins.
Reduced chi-squared = 0.8822526 for 55 degrees of freedom
Null hypothesis probability = 0.719
Photon flux (15-150 keV) in 373.0 sec: 6.023980E-02 ( -0.00700252 0.00689086 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16525e-06 ( -1.33168e-07 1.90569e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 198.552 sec. to 199.560 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09303 ( -1.17291 0.914038 )
Norm@50keV : 1.921744E-03 ( -1.012126E-03 9.361712E-04) )
------------------------------------------------------------
Chi-Squared = 59.93152 using 59 PHA bins.
Reduced chi-squared = 1.051430 for 57 degrees of freedom
Null hypothesis probability = 0.370
Photon flux (15-150 keV) in 1.008 sec: 0.222749 ( -0.11266 0.115857 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.03026e-08 ( -2.03026e-08 1.05187e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 198.552 sec. to 199.560 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.743622 ( -3.74362 2.76527 )
Epeak [keV] : 185.596 ( )
Norm@50keV : 2.810387E-03 ( -1.966965E-03 9.071913E-04) )
------------------------------------------------------------
Chi-Squared = 59.97405 using 59 PHA bins.
Reduced chi-squared = 1.070965 for 56 degrees of freedom
Null hypothesis probability = 0.334
Photon flux (15-150 keV) in 1.008 sec: 0.222690 ( -0.112629 0.115806 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.00989e-08 ( -1.26624e-08 1.07388e-08 ) ergs/cm2
Band function
Time interval is from 198.552 sec. to 199.560 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.550772 ( -9.44923 5.55077 )
beta : -1.25970 ( -8.74030 1.31929 )
Epeak [keV] : 128.644 ( -128.544 9871.36 )
Norm@50keV : 3.596504E-03 ( -1.81001 5.92011 )
------------------------------------------------------------
Chi-Squared = 59.86786 using 59 PHA bins.
Reduced chi-squared = 1.088507 for 55 degrees of freedom
Null hypothesis probability = 0.304
Photon flux (15-150 keV) in 1.008 sec: 0.214926 ( -0.114128 0.118674 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.95241e-08 ( -9.30061e-09 5.4175e-09 ) ergs/cm2
Plot creation:
Thu Jan 29 14:03:27 EST 2009