batgrbproduct Analysis for Trigger=304549
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 v2.41
Process Start Time (local time): Mon Mar 3 14:16:43 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger304549/SDC
======================================================================
Trigger: 00304549 Segment: 000
BAT Trigger Time: 226228237.888 [s; MET]
Trigger Stop: 226228238.4 [s; MET]
UTC: 2008-03-03T09:10:35.271760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 112.073412725568 Dec: -70.2400675622224 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.67
Image Trigger?: NO
Rate S/N Ratio: 12.6885775404495 [ if not an image trigger ]
Image S/N Ratio: 7.67
Flight Position: [ source = BAT ]
RA: 112.073412725568 Dec: -70.2400675622224 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 112.019374760461 Dec: -70.2313891521169 [deg; J2000]
{ 07h 28m 04.6s , -70d 13' 53.0" }
+/- 1.57541753928539 [arcmin] (estimated 90% radius based on SNR)
+/- 0.552967552774822 [arcmin] (formal 1-sigma fit error)
SNR: 15.8900241345686
RA = 7h 28m 4.6s (112.019375 deg.)
Dec = -70d 13' 53" (-70.231389 deg.)
Angular difference between Flight and Ground position is 1.213747 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 67.3640000224113 +/- 20.4871178935379
Measured from: 0.223999977111816
to: 67.5879999995232 [s; relative to TRIGTIME]
T50: 29.3600000143051 +/- 12.348733363983
Measured from: 1.95199999213219
to: 31.3120000064373 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0600000023841858
to: 1.06000000238419 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.232000023126602
to: 73.2439999878407 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.265011 0.417137 0.291974 0.066406
0.047736 0.047148 0.041377 0.036398 [error]
Peak 0.054549 0.066610 0.028542 0.012207
0.006826 0.007003 0.005909 0.005176 [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 9.33e-08 1.67e-07 2.29e-07 6.51e-07 6.61e-07 1.14e-06 erg/cm2
Error 2.20e-08 2.30e-08 4.16e-08 2.63e-07 9.82e-08 2.93e-07 erg/cm2
Peak flux Power-law 5.32e-01 4.56e-01 2.67e-01 2.34e-01 1.36e+00 1.49e+00 ph/cm2/s
Error 1.05e-01 5.85e-02 4.95e-02 8.49e-02 1.74e-01 1.91e-01 ph/cm2/s
Fluence Cutoff-PL 9.34e-08 1.67e-07 2.29e-07 6.45e-07 6.61e-07 1.13e-06 erg/cm2
Error 2.20e-08 2.30e-08 4.16e-08 2.62e-07 9.83e-08 2.91e-07 erg/cm2
Peak flux Cutoff-PL 5.05e-01 4.91e-01 2.67e-01 1.05e-01 1.33e+00 1.36e+00 ph/cm2/s
Error 1.18e-01 9.02e-02 5.90e-02 1.55e-01 1.82e-01 2.46e-01 ph/cm2/s
Fluence Band 8.78e-08 1.63e-07 2.31e-07 6.70e-07 6.64e-07 1.27e-06 erg/cm2
Error 1.37e-08 2.37e-08 2.44e-08 1.35e-07 9.02e-08 2.07e-07 erg/cm2
Peak flux Band 4.76e-01 5.25e-01 2.50e-01 1.56e-01 1.33e+00 1.41e+00 ph/cm2/s
Error 1.25e-01 9.14e-02 5.67e-02 1.30e-01 1.76e-01 2.06e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.545 0.251 - - 9.54e-04 1.29e-04 63.091 57
CPL 1.543 0.252 9987.1 5000.0 9.59e-04 1.30e-04 63.102 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.772 0.226 - - 9.95e-03 1.42e-03 52.935 57
CPL 1.183 1.276 58.7 4980.3 2.18e-02 8.65e-02 52.164 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: 3.968000 sec.
T50 in the 50-300 keV band: 1.984000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 73.476 -0.232 73.244
T90 67.364 0.224 67.588
T50 29.360 1.952 31.312
Peak 1.000 0.060 1.060
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
112.0194 -70.2314 0.0121 30.7 -10.8 0.7093 15.9 TRIG_00304549
------------------------------------------
Foreground time interval of the image:
-0.232 13.717 (delta_t = 13.949 [sec])
Background time interval of the image:
-239.888 -0.232 (delta_t = 239.656 [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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.232 sec. to 73.244 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54473 ( -0.249574 0.251957 )
Norm@50keV : 9.544257E-04 ( -1.298531E-04 1.282130E-04) )
------------------------------------------------------------
Chi-Squared = 63.09071 using 59 PHA bins.
Reduced chi-squared = 1.106854 for 57 degrees of freedom
Null hypothesis probability = 0.270
Photon flux (15-150 keV) in 73.48 sec: 0.120642 ( -0.016205 0.016263 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.60787e-07 ( -9.7746e-08 9.87314e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.232 sec. to 73.244 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54265 ( -0.251059 0.253411 )
Epeak [keV] : 9987.10 ( -9987.09 12.9014 )
Norm@50keV : 9.586286E-04 ( -1.323388E-04 1.273004E-04) )
------------------------------------------------------------
Chi-Squared = 63.10157 using 59 PHA bins.
Reduced chi-squared = 1.126814 for 56 degrees of freedom
Null hypothesis probability = 0.240
Photon flux (15-150 keV) in 73.48 sec: 0.120596 ( -0.0162 0.016259 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.60762e-07 ( -9.77203e-08 9.88372e-08 ) ergs/cm2
Band function
Time interval is from -0.232 sec. to 73.244 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.10453 ( -8.89547 5.84595 )
beta : -1.56499 ( -8.43501 0.269130 )
Epeak [keV] : 52.8240 ( -52.7240 9742.14 )
Norm@50keV : 2.009832E-03 ( -2.009832E-03 1.38880 )
------------------------------------------------------------
Chi-Squared = 63.07145 using 59 PHA bins.
Reduced chi-squared = 1.146754 for 55 degrees of freedom
Null hypothesis probability = 0.213
Photon flux (15-150 keV) in 73.48 sec: 0.133939 ( -0.02897 2.08012 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.64145e-07 ( -8.6411e-08 9.39405e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.060 sec. to 1.060 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77213 ( -0.222330 0.229289 )
Norm@50keV : 9.947819E-03 ( -1.432646E-03 1.403950E-03) )
------------------------------------------------------------
Chi-Squared = 52.93517 using 59 PHA bins.
Reduced chi-squared = 0.9286871 for 57 degrees of freedom
Null hypothesis probability = 0.628
Photon flux (15-150 keV) in 1.000 sec: 1.35626 ( -0.17379 0.17392 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.16643e-08 ( -1.33566e-08 1.36677e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.060 sec. to 1.060 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18288 ( -1.54966 1.00295 )
Epeak [keV] : 58.7185 ( -19.3564 9941.28 )
Norm@50keV : 2.176827E-02 ( -1.596954E-02 0.157049 )
------------------------------------------------------------
Chi-Squared = 52.16449 using 59 PHA bins.
Reduced chi-squared = 0.9315087 for 56 degrees of freedom
Null hypothesis probability = 0.621
Photon flux (15-150 keV) in 1.000 sec: 1.33150 ( -0.18292 0.18019 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.56739e-08 ( -1.68343e-08 1.67201e-08 ) ergs/cm2
Band function
Time interval is from 0.060 sec. to 1.060 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.624823 ( -9.37518 4.10734 )
beta : -2.13275 ( -7.86725 0.454096 )
Epeak [keV] : 44.0323 ( -43.9323 9955.97 )
Norm@50keV : 5.096999E-02 ( -0.371026 260.863 )
------------------------------------------------------------
Chi-Squared = 50.24688 using 59 PHA bins.
Reduced chi-squared = 0.9135797 for 55 degrees of freedom
Null hypothesis probability = 0.656
Photon flux (15-150 keV) in 1.000 sec: 1.32692 ( -0.17929 0.17192 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.67925e-08 ( -1.45885e-08 1.36705e-08 ) ergs/cm2
Plot creation:
Mon Mar 3 15:55:46 EST 2008