batgrbproduct Analysis for Trigger=162580
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): Wed Jan 9 17:25:28 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger162580/SDC
======================================================================
Trigger: 00162580 Segment: 000
BAT Trigger Time: 152864801.36 [s; MET]
Trigger Stop: 152864801.392 [s; MET]
UTC: 2005-11-05T06:26:41.537840 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 265.289452879954 Dec: 34.9208520942204 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.09
Image Trigger?: NO
Rate S/N Ratio: 17.832554500127 [ if not an image trigger ]
Image S/N Ratio: 7.09
Flight Position: [ source = BAT ]
RA: 265.289452879954 Dec: 34.9208520942204 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 265.296282147326 Dec: 34.9468838406215 [deg; J2000]
{ 17h 41m 11.1s , +34d 56' 48.8" }
+/- 2.35694216922233 [arcmin] (estimated 90% radius based on SNR)
+/- 0.97078436146998 [arcmin] (formal 1-sigma fit error)
SNR: 8.93699143907044
RA = 17h 41m 11.1s (265.296282 deg.)
Dec = 34d 56' 49" (34.946884 deg.)
Angular difference between Flight and Ground position is 1.597620 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 0.0559999942779541 +/- 0.0144222095322683
Measured from: 0
to: 0.0559999942779541 [s; relative to TRIGTIME]
T50: 0.0320000052452087 +/- 0.0178885400881622
Measured from: 0.00799998641014099
to: 0.0399999916553497 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.468000024557114
to: 0.531999975442886 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.00400000810623169
to: 0.0639999806880951 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.006332 0.011624 0.010470 0.002168
0.001759 0.001969 0.001838 0.001136 [error]
Peak 0.006090 0.011052 0.010870 0.002104
0.001824 0.002011 0.001885 0.001149 [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 1.98e-09 4.03e-09 6.30e-09 2.17e-08 1.76e-08 3.23e-08 erg/cm2
Error 6.34e-10 8.36e-10 1.37e-09 9.51e-09 3.50e-09 0.00e+00 erg/cm2
Peak flux Power-law 7.83e-01 9.66e-01 8.65e-01 1.34e+00 3.08e+00 3.96e+00 ph/cm2/s
Error 2.80e-01 2.22e-01 1.73e-01 5.35e-01 6.11e-01 7.59e-01 ph/cm2/s
Fluence Cutoff-PL 1.61e-09 4.48e-09 7.31e-09 8.32e-09 1.77e-08 2.14e-08 erg/cm2
Error 7.47e-10 1.04e-09 1.86e-09 1.14e-08 3.65e-09 1.16e-08 erg/cm2
Peak flux Cutoff-PL 6.55e-01 1.02e+00 9.68e-01 7.55e-01 3.06e+00 3.40e+00 ph/cm2/s
Error 3.35e-01 2.56e-01 2.44e-01 7.46e-01 6.11e-01 9.06e-01 ph/cm2/s
Fluence Band 1.59e-09 4.46e-09 7.33e-09 8.18e-09 1.77e-08 2.15e-08 erg/cm2
Error 7.39e-10 1.03e-09 1.86e-09 8.65e-09 3.65e-09 4.93e-09 erg/cm2
Peak flux Band 6.10e-01 1.09e+00 9.19e-01 1.04e+00 3.01e+00 3.66e+00 ph/cm2/s
Error 3.85e-01 2.99e-01 2.07e-01 6.07e-01 6.17e-01 9.32e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.351 0.281 - - 2.65e-02 5.00e-03 49.127 57
CPL 0.331 1.305 93.2 4968.3 7.89e-02 1.81e-01 46.788 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.158 0.297 - - 2.64e-02 5.01e-03 46.246 57
CPL 0.421 1.245 124.8 4963.4 5.68e-02 1.15e-01 45.149 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 0.068 -0.004 0.064
T90 0.056 0.000 0.056
T50 0.032 0.008 0.040
Peak 1.000 -0.468 0.532
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
265.2963 +34.9469 0.0214 20.9 142.0 0.0300 8.9 TRIG_00162580
------------------------------------------
Foreground time interval of the image:
0.076 0.144 (delta_t = 0.068 [sec])
Background time interval of the image:
-60.280 0.076 (delta_t = 60.356 [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 0.076 sec. to 0.144 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35118 ( -0.279866 0.281876 )
Norm@50keV : 2.645977E-02 ( -4.996311E-03 4.995968E-03) )
------------------------------------------------------------
Chi-Squared = 49.12678 using 59 PHA bins.
Reduced chi-squared = 0.8618733 for 57 degrees of freedom
Null hypothesis probability = 0.762
Photon flux (15-150 keV) in 6.8000E-02 sec: 3.18841 ( -0.62549 0.62717 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.75555e-08 ( -3.48452e-09 3.5156e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.076 sec. to 0.144 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.331269 ( -1.48886 1.12100 )
Epeak [keV] : 93.1775 ( -29.8006 9906.82 )
Norm@50keV : 7.892276E-02 ( -7.892276E-02 0.283805 )
------------------------------------------------------------
Chi-Squared = 46.78804 using 59 PHA bins.
Reduced chi-squared = 0.8355008 for 56 degrees of freedom
Null hypothesis probability = 0.805
Photon flux (15-150 keV) in 6.8000E-02 sec: 3.17058 ( -0.62536 0.62863 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.76952e-08 ( -3.66744e-09 3.63304e-09 ) ergs/cm2
Band function
Time interval is from 0.076 sec. to 0.144 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.331532 ( -1.12059 1.21717 )
beta : -9.13637 ( -0.863630 7.90768 )
Epeak [keV] : 93.1612 ( -29.2747 9906.84 )
Norm@50keV : 7.891680E-02 ( -7.891680E-02 0.284694 )
------------------------------------------------------------
Chi-Squared = 46.78806 using 59 PHA bins.
Reduced chi-squared = 0.8506919 for 55 degrees of freedom
Null hypothesis probability = 0.777
Photon flux (15-150 keV) in 6.8000E-02 sec: 3.17052 ( -0.62539 0.62813 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.76805e-08 ( -3.66105e-09 3.63569e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.076 sec. to 0.148 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15849 ( -0.302385 0.291924 )
Norm@50keV : 2.636390E-02 ( -5.019831E-03 4.996724E-03) )
------------------------------------------------------------
Chi-Squared = 46.24599 using 59 PHA bins.
Reduced chi-squared = 0.8113331 for 57 degrees of freedom
Null hypothesis probability = 0.845
Photon flux (15-150 keV) in 7.2000E-02 sec: 3.07770 ( -0.60962 0.61207 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.9491e-08 ( -3.816e-09 3.82421e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.076 sec. to 0.148 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.420550 ( -1.52975 0.959819 )
Epeak [keV] : 124.839 ( -51.5589 9875.16 )
Norm@50keV : 5.684765E-02 ( -3.424343E-02 0.196200 )
------------------------------------------------------------
Chi-Squared = 45.14890 using 59 PHA bins.
Reduced chi-squared = 0.8062302 for 56 degrees of freedom
Null hypothesis probability = 0.850
Photon flux (15-150 keV) in 7.2000E-02 sec: 3.05516 ( -0.60896 0.61249 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.94831e-08 ( -3.96274e-09 3.91255e-09 ) ergs/cm2
Band function
Time interval is from 0.076 sec. to 0.148 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.555030 ( -10.5550 4.44497 )
beta : -1.49398 ( -8.50602 0.544488 )
Epeak [keV] : 66.0748 ( -65.9748 1001.15 )
Norm@50keV : 0.218421 ( -0.218421 133.850 )
------------------------------------------------------------
Chi-Squared = 44.82086 using 59 PHA bins.
Reduced chi-squared = 0.8149248 for 55 degrees of freedom
Null hypothesis probability = 0.835
Photon flux (15-150 keV) in 7.2000E-02 sec: 3.01485 ( -0.61697 0.61766 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.94697e-08 ( -3.96778e-09 3.91039e-09 ) ergs/cm2
Plot creation:
Wed Jan 9 17:31:26 EST 2008