batgrbproduct Analysis for Trigger=213180
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): Tue Jan 1 14:50:17 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger213180/SDC
======================================================================
Trigger: 00213180 Segment: 000
BAT Trigger Time: 170976733.696 [s; MET]
Trigger Stop: 170976745.856 [s; MET]
UTC: 2006-06-02T21:32:12.464320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 149.575786869351 Dec: 0.323047531306239 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.58
Image Trigger?: NO
Rate S/N Ratio: 13.114877048604 [ if not an image trigger ]
Image S/N Ratio: 7.58
Flight Position: [ source = BAT ]
RA: 149.575786869351 Dec: 0.323047531306239 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 149.578724003955 Dec: 0.313092277190948 [deg; J2000]
{ 09h 58m 18.9s , +00d 18' 47.1" }
+/- 1.64799221701058 [arcmin] (estimated 90% radius based on SNR)
+/- 0.546458547006908 [arcmin] (formal 1-sigma fit error)
SNR: 14.8998687353578
RA = 9h 58m 18.9s (149.578724 deg.)
Dec = 0d 18' 47" (0.313092 deg.)
Angular difference between Flight and Ground position is 0.622769 arcmin
Partial Coding Fraction: 0.4375 [ including projection effects ]
Duration
T90: 62.108000010252 +/- 13.2775565565479
Measured from: 4.44799998402596
to: 66.555999994278 [s; relative to TRIGTIME]
T50: 33.0920000076294 +/- 10.9106282217194
Measured from: 15.8759999871254
to: 48.9679999947548 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 18.0439999997616
to: 19.0439999997616 [s; relative to TRIGTIME]
Total Fluence
Measured from: 2.12000000476837
to: 86.447999984026 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.447495 0.788516 0.768728 0.268746
0.070991 0.072609 0.066025 0.059473 [error]
Peak 0.014662 0.018085 0.032278 0.012071
0.007887 0.007980 0.007389 0.006557 [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 1.63e-07 3.48e-07 5.86e-07 2.25e-06 1.61e-06 3.33e-06 erg/cm2
Error 3.10e-08 3.98e-08 6.10e-08 5.32e-07 1.57e-07 5.61e-07 erg/cm2
Peak flux Power-law 1.02e-01 1.57e-01 1.81e-01 4.02e-01 5.59e-01 8.42e-01 ph/cm2/s
Error 8.05e-02 7.73e-02 5.44e-02 2.62e-01 1.97e-01 2.68e-01 ph/cm2/s
Fluence Cutoff-PL 1.47e-07 3.60e-07 6.16e-07 1.33e-06 1.59e-06 2.47e-06 erg/cm2
Error 3.85e-08 4.50e-08 7.66e-08 1.00e-06 1.64e-07 1.00e-06 erg/cm2
Peak flux Cutoff-PL 4.13e-02 1.40e-01 2.27e-01 1.47e-01 5.08e-01 5.55e-01 ph/cm2/s
Error 8.36e-02 8.81e-02 8.72e-02 3.21e-01 1.95e-01 3.51e-01 ph/cm2/s
Fluence Band 1.41e-07 3.70e-07 5.86e-07 2.06e-06 1.59e-06 3.18e-06 erg/cm2
Error 4.26e-08 5.07e-08 7.78e-08 5.39e-07 1.53e-07 5.95e-07 erg/cm2
Peak flux Band 4.43e-02 1.36e-01 2.29e-01 2.03e-01 4.96e-01 5.64e-01 ph/cm2/s
Error 9.26e-02 8.29e-02 2.94e-01 1.96e-01 3.51e-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 1.251 0.164 - - 1.91e-03 1.80e-04 38.620 57
CPL 0.806 0.659 152.7 4955.4 3.03e-03 2.38e-03 37.344 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.792 0.592 - - 4.86e-03 1.80e-03 50.266 57
CPL -1.312 3.647 108.7 4981.4 2.63e-02 5.04e-02 49.314 0
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: 78.336000 sec.
T50 in the 50-300 keV band: 21.760000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 84.328 2.120 86.448
T90 62.108 4.448 66.556
T50 33.092 15.876 48.968
Peak 1.000 18.044 19.044
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
149.5787 +0.3131 0.0130 44.5 -7.7 2.3328 14.9 TRIG_00213180
------------------------------------------
Foreground time interval of the image:
2.120 86.448 (delta_t = 84.328 [sec])
Background time interval of the image:
-239.696 2.120 (delta_t = 241.816 [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 2.120 sec. to 86.448 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25053 ( -0.165632 0.161703 )
Norm@50keV : 1.908086E-03 ( -1.802406E-04 1.794533E-04) )
------------------------------------------------------------
Chi-Squared = 38.62031 using 59 PHA bins.
Reduced chi-squared = 0.6775492 for 57 degrees of freedom
Null hypothesis probability = 0.970
Photon flux (15-150 keV) in 84.33 sec: 0.225695 ( -0.022896 0.023013 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.61017e-06 ( -1.56204e-07 1.56879e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.120 sec. to 86.448 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.806343 ( -0.764555 0.552517 )
Epeak [keV] : 152.709 ( -63.5678 9847.29 )
Norm@50keV : 3.034841E-03 ( -1.250329E-03 3.502358E-03) )
------------------------------------------------------------
Chi-Squared = 37.34401 using 59 PHA bins.
but latest trial 1.26815 gives Chi-Squared = 1.30253
Reduced chi-squared = 0.6668573 for 56 degrees of freedom
Null hypothesis probability = 0.974
Photon flux (15-150 keV) in 84.33 sec: 0.221820 ( -0.023617 0.023704 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5868e-06 ( -1.65025e-07 1.62605e-07 ) ergs/cm2
Band function
Time interval is from 2.120 sec. to 86.448 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.589172 ( -11.1877 2.54269 )
beta : -1.49397 ( -0.247411 0.212194 )
Epeak [keV] : 105.999 ( -39.4122 725.395 )
Norm@50keV : 4.050969E-03 ( -11.0233 21.2097 )
------------------------------------------------------------
Chi-Squared = 37.20787 using 59 PHA bins.
Reduced chi-squared = 0.6765066 for 55 degrees of freedom
Null hypothesis probability = 0.968
Photon flux (15-150 keV) in 84.33 sec: 0.220788 ( -0.024142 0.012142 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59121e-06 ( -1.57368e-07 1.48008e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 18.044 sec. to 19.044 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.792349 ( -0.646601 0.538146 )
Norm@50keV : 4.863351E-03 ( -1.865164E-03 1.732544E-03) )
------------------------------------------------------------
Chi-Squared = 50.26592 using 59 PHA bins.
Reduced chi-squared = 0.8818583 for 57 degrees of freedom
Null hypothesis probability = 0.724
Photon flux (15-150 keV) in 1.000 sec: 0.559121 ( -0.192777 0.201346 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.70162e-08 ( -1.71806e-08 1.72027e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 18.044 sec. to 19.044 sec.
Parameters : value lower 90% higher 90%
Photon index: -1.31183 ( -1.68817 5.60544 )
Epeak [keV] : 108.729 ( -71.5676 9891.27 )
Norm@50keV : 2.627176E-02 ( -2.627176E-02 7.458162E-02) )
------------------------------------------------------------
Chi-Squared = 49.31442 using 59 PHA bins.
but latest trial 3.35935 gives Chi-Squared = 1.73101
but latest trial 36.4117 gives Chi-Squared = 3.15658
Reduced chi-squared = 0.8806146 for 56 degrees of freedom
Null hypothesis probability = 0.724
Photon flux (15-150 keV) in 1.000 sec: 0.508010 ( -0.173512 0.216577 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.56502e-08 ( -1.83892e-08 1.80757e-08 ) ergs/cm2
Band function
Time interval is from 18.044 sec. to 19.044 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.720212 ( -9.27979 5.72021 )
beta : -0.796288 ( -0.533595 0.650600 )
Epeak [keV] : 15.4265 ( -15.3265 9984.57 )
Norm@50keV : 7.317511E-03 ( -7.317511E-03 12104.4 )
------------------------------------------------------------
Chi-Squared = 50.26606 using 59 PHA bins.
Reduced chi-squared = 0.9139284 for 55 degrees of freedom
Null hypothesis probability = 0.656
Photon flux (15-150 keV) in 1.000 sec: 0.496116 ( -0.169064 0.223389 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.59031e-08 ( -1.72516e-08 1.7672e-08 ) ergs/cm2
Plot creation:
Tue Jan 1 15:14:25 EST 2008