batgrbproduct Analysis for Trigger=215177
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 17:30:34 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger215177/GCN5_download_cron
======================================================================
Trigger: 00215177 Segment: 000
BAT Trigger Time: 172301200 [s; MET]
Trigger Stop: 172301264 [s; MET]
UTC: 2006-06-18T05:26:38.737120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 134.971751604092 Dec: -41.4318109255466 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.35
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 9.35
Flight Position: [ source = BAT ]
RA: 134.971751604092 Dec: -41.4318109255466 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 134.976071125479 Dec: -41.3689268934986 [deg; J2000]
{ 08h 59m 54.3s , -41d 22' 08.1" }
+/- 2.83703725848962 [arcmin] (estimated 90% radius based on SNR)
+/- 1.60843003983735 [arcmin] (formal 1-sigma fit error)
SNR: 6.85753959288275
RA = 8h 59m 54.3s (134.976071 deg.)
Dec = -41d 22' 8" (-41.368927 deg.)
Angular difference between Flight and Ground position is 3.778047 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 724.192000031471 +/- 154.426806654403
Measured from: -128.696000009775
to: 595.496000021696 [s; relative to TRIGTIME]
T50: 376.551999986172 +/- 122.619767418522
Measured from: 19.2560000121593
to: 395.807999998331 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -127.532000005245
to: -126.532000005245 [s; relative to TRIGTIME]
Total Fluence
Measured from: -153.303999990225
to: 622.152000010014 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.287299 2.765261 0.127510 0.198258
0.162967 0.164439 0.145358 0.132020 [error]
Peak 0.017255 0.029102 0.006455 0.004656
0.007285 0.007487 0.006476 0.005773 [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 1.35e-06 1.02e-06 5.13e-07 3.69e-07 3.05e-06 3.25e-06 erg/cm2
Error 1.18e-07 8.89e-08 9.25e-08 1.20e-07 2.48e-07 2.99e-07 erg/cm2
Peak flux Power-law 1.77e-01 1.38e-01 7.24e-02 5.49e-02 4.13e-01 4.43e-01 ph/cm2/s
Error 8.85e-02 5.63e-02 4.45e-02 6.93e-02 1.67e-01 1.84e-01 ph/cm2/s
Fluence Cutoff-PL 1.27e-06 1.16e-06 9.83e-08 1.60e-10 2.53e-06 2.53e-06 erg/cm2
Error 1.38e-07 1.15e-07 5.90e-08 7.49e-10 2.04e-07 2.04e-07 erg/cm2
Peak flux Cutoff-PL 1.44e-01 2.06e-01 5.49e-02 1.17e-03 4.06e-01 4.06e-01 ph/cm2/s
Error 9.37e-02 8.45e-02 6.18e-02 2.35e-02 1.58e-01 1.59e-01 ph/cm2/s
Fluence Band 1.31e-06 9.64e-07 3.65e-07 1.53e-07 2.85e-06 3.33e-06 erg/cm2
Error 6.90e-08 5.72e-08 3.81e-08 2.03e-07 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.52e-01 1.93e-01 6.81e-02 4.08e-03 4.17e-01 4.17e-01 ph/cm2/s
Error 7.57e-02 7.13e-02 4.70e-02 4.13e-02 1.55e-01 1.54e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.990 0.169 - - 3.29e-04 4.43e-05 102.627 57
CPL -1.343 1.424 22.1 2.6 3.64e-01 0.00e+00 62.233 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.932 0.659 - - 2.84e-03 1.41e-03 38.396 0
CPL -1.328 2.373 39.1 25.5 2.76e-01 1.09e+00 35.039 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 775.456 -153.304 622.152
T90 724.192 -128.696 595.496
T50 376.552 19.256 395.808
Peak 1.000 -127.532 -126.532
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
134.9761 -41.3689 0.0280 0.1 -53.8 5.6948 6.9 TRIG_00215177
------------------------------------------
Foreground time interval of the image:
-153.304 622.152 (delta_t = 775.456 [sec])
Background time interval of the image:
-239.000 -153.304 (delta_t = 85.696 [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 -153.304 sec. to 622.152 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.99029 ( -0.165259 0.172026 )
Norm@50keV : 3.291232E-04 ( -4.365377E-05 4.496315E-05) )
------------------------------------------------------------
Chi-Squared = 102.6272 using 59 PHA bins.
Reduced chi-squared = 1.800476 for 57 degrees of freedom
Null hypothesis probability = 2.010E-04
Photon flux (15-150 keV) in 775.5 sec: 8.988211E-02 ( -0.00654814 0.00655228 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.05326e-06 ( -2.45896e-07 2.50401e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -153.304 sec. to 622.152 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.34333 ( -1.65667 1.19196 )
Epeak [keV] : 22.1286 ( -2.68540 2.42915 )
Norm@50keV : 0.363728 ( )
------------------------------------------------------------
Chi-Squared = 62.23280 using 59 PHA bins.
but latest trial 24.5946 gives Chi-Squared = 4.23152
Reduced chi-squared = 1.111300 for 56 degrees of freedom
Null hypothesis probability = 0.264
Photon flux (15-150 keV) in 775.5 sec: 8.984539E-02 ( -0.00654549 0.00654948 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.52629e-06 ( -2.00886e-07 2.06167e-07 ) ergs/cm2
Band function
Time interval is from -153.304 sec. to 622.152 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.36333 ( -0.162315 0.213448 )
beta : -4.60810 ( -5.39155 0.799669 )
Epeak [keV] : 13.1765 ( -1.38675 1.80453 )
Norm@50keV : 3.708902E-03 ( -0.443871 8.28065 )
------------------------------------------------------------
Chi-Squared = 79.62462 using 59 PHA bins.
Reduced chi-squared = 1.447720 for 55 degrees of freedom
Null hypothesis probability = 1.662E-02
Photon flux (15-150 keV) in 775.5 sec: 8.512132E-02 ( -0.00847641 0.00637849 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.85493e-06 ( -2.01157e-07 2.0405e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -127.532 sec. to -126.532 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.93199 ( -0.596620 0.722353 )
Norm@50keV : 2.838379E-03 ( -1.417775E-03 1.396762E-03) )
------------------------------------------------------------
Chi-Squared = 38.39554 using 59 PHA bins.
but latest trial 1.418998E-03 gives Chi-Squared = 4.14169
Reduced chi-squared = 0.6736059 for 57 degrees of freedom
Null hypothesis probability = 0.972
Photon flux (15-150 keV) in 1.000 sec: 0.412742 ( -0.166571 0.166873 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.60988e-08 ( -1.21148e-08 1.324e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -127.532 sec. to -126.532 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.32789 ( -1.67211 3.07340 )
Epeak [keV] : 39.0600 ( -14.6019 36.3978 )
Norm@50keV : 0.276466 ( -0.276466 1.89747 )
------------------------------------------------------------
Chi-Squared = 35.03909 using 59 PHA bins.
Reduced chi-squared = 0.6256981 for 56 degrees of freedom
Null hypothesis probability = 0.987
Photon flux (15-150 keV) in 1.000 sec: 0.405775 ( -0.154164 0.162632 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.18739e-08 ( -9.0028e-09 1.24027e-08 ) ergs/cm2
Band function
Time interval is from -127.532 sec. to -126.532 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.541561 ( -6.36733 4.45844 )
beta : -9.35755 ( -0.642448 19.3575 )
Epeak [keV] : 40.3806 ( -15.2705 45.1622 )
Norm@50keV : 9.032393E-02 ( -0.878514 168.786 )
------------------------------------------------------------
Chi-Squared = 35.21315 using 59 PHA bins.
Reduced chi-squared = 0.6402391 for 55 degrees of freedom
Null hypothesis probability = 0.983
Photon flux (15-150 keV) in 1.000 sec: 0.417348 ( -0.154282 0.15491 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.24894e-08 ( -9.411e-09 1.24839e-08 ) ergs/cm2
Plot creation:
Tue Jan 1 17:47:16 EST 2008