batgrbproduct Analysis for Trigger=226382
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 2 01:37:48 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger226382/SDC
======================================================================
Trigger: 00226382 Segment: 000
BAT Trigger Time: 178167599.104 [s; MET]
Trigger Stop: 178167600.128 [s; MET]
UTC: 2006-08-25T02:59:57.702280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 18.1016258752534 Dec: 55.8051742050065 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 20.09
Image Trigger?: NO
Rate S/N Ratio: 54.018515344278 [ if not an image trigger ]
Image S/N Ratio: 20.09
Flight Position: [ source = BAT ]
RA: 18.1016258752534 Dec: 55.8051742050065 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 18.1353919348639 Dec: 55.7917650862048 [deg; J2000]
{ 01h 12m 32.5s , +55d 47' 30.4" }
+/- 0.753692562544778 [arcmin] (estimated 90% radius based on SNR)
+/- 0.24282355540831 [arcmin] (formal 1-sigma fit error)
SNR: 45.5570081166278
RA = 1h 12m 32.5s (18.135392 deg.)
Dec = 55d 47' 30" (55.791765 deg.)
Angular difference between Flight and Ground position is 1.394336 arcmin
Partial Coding Fraction: 0.90625 [ including projection effects ]
Duration
T90: 7.97600001096725 +/- 0.656804374838406
Measured from: -1.98800000548363
to: 5.98800000548363 [s; relative to TRIGTIME]
T50: 3.77200001478195 +/- 0.18748868259098
Measured from: 0.175999999046326
to: 3.94800001382828 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0719999969005585
to: 1.07199999690056 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.6240000128746
to: 7 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.547465 0.724312 0.408944 0.048203
0.018120 0.019001 0.016854 0.014905 [error]
Peak 0.088167 0.134706 0.107247 0.011533
0.006060 0.006708 0.006169 0.004866 [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 1.72e-07 2.77e-07 3.35e-07 7.95e-07 1.01e-06 1.58e-06 erg/cm2
Error 1.15e-08 1.06e-08 1.71e-08 8.94e-08 3.98e-08 1.01e-07 erg/cm2
Peak flux Power-law 8.52e-01 9.08e-01 6.86e-01 8.42e-01 2.77e+00 3.29e+00 ph/cm2/s
Error 8.81e-02 5.74e-02 4.97e-02 1.26e-01 1.63e-01 1.96e-01 ph/cm2/s
Fluence Cutoff-PL 1.55e-07 2.90e-07 3.42e-07 3.57e-07 9.62e-07 1.16e-06 erg/cm2
Error 1.43e-08 1.28e-08 1.87e-08 1.43e-07 4.76e-08 1.51e-07 erg/cm2
Peak flux Cutoff-PL 7.07e-01 9.72e-01 7.42e-01 3.66e-01 2.66e+00 2.79e+00 ph/cm2/s
Error 1.10e-01 6.87e-02 6.01e-02 1.49e-01 1.72e-01 2.28e-01 ph/cm2/s
Fluence Band 1.51e-07 2.93e-07 3.29e-07 6.06e-07 9.70e-07 1.21e-06 erg/cm2
Error 1.55e-08 1.46e-08 2.28e-08 2.33e-07 4.57e-08 0.00e+00 erg/cm2
Peak flux Band 7.07e-01 9.72e-01 7.42e-01 3.67e-01 2.66e+00 2.79e+00 ph/cm2/s
Error 1.10e-01 6.87e-02 6.01e-02 1.48e-01 1.72e-01 2.28e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.724 0.071 - - 1.03e-02 3.88e-04 64.760 57
CPL 1.155 0.314 73.0 19.7 1.99e-02 7.34e-03 53.723 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.404 0.101 - - 2.27e-02 1.33e-03 63.889 57
CPL 0.502 0.484 86.2 25.4 6.24e-02 3.56e-02 51.302 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: 6.272000 sec.
T50 in the 50-300 keV band: 3.200000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 10.624 -3.624 7.000
T90 7.976 -1.988 5.988
T50 3.772 0.176 3.948
Peak 1.000 0.072 1.072
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
18.1354 +55.7918 0.0042 12.2 106.7 1.7311 45.6 TRIG_00226382
------------------------------------------
Foreground time interval of the image:
-3.624 7.000 (delta_t = 10.624 [sec])
Background time interval of the image:
-239.104 -3.624 (delta_t = 235.480 [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 -3.624 sec. to 7.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72405 ( -7.047462E-02 7.090783E-02) )
Norm@50keV : 1.031730E-02 ( -3.889510E-04 3.878661E-04) )
------------------------------------------------------------
Chi-Squared = 64.75977 using 59 PHA bins.
Reduced chi-squared = 1.136136 for 57 degrees of freedom
Null hypothesis probability = 0.224
Photon flux (15-150 keV) in 10.62 sec: 1.38197 ( -0.05374 0.05391 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01268e-06 ( -3.96423e-08 3.99291e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.624 sec. to 7.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15550 ( -0.325845 0.301777 )
Epeak [keV] : 73.0064 ( -11.1146 28.2684 )
Norm@50keV : 1.990810E-02 ( -5.749693E-03 8.928185E-03) )
------------------------------------------------------------
Chi-Squared = 53.72276 using 59 PHA bins.
Reduced chi-squared = 0.9593350 for 56 degrees of freedom
Null hypothesis probability = 0.562
Photon flux (15-150 keV) in 10.62 sec: 1.32833 ( -0.05987 0.06016 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.61945e-07 ( -4.64391e-08 4.87883e-08 ) ergs/cm2
Band function
Time interval is from -3.624 sec. to 7.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.15506 ( -0.627241 1.24839 )
beta : -2.69429 ( -8.01705 0.170066 )
Epeak [keV] : 72.8767 ( -16.5261 37.8262 )
Norm@50keV : 1.993105E-02 ( -2.900223E-02 0.194283 )
------------------------------------------------------------
Chi-Squared = 53.72196 using 59 PHA bins.
Reduced chi-squared = 0.9767630 for 55 degrees of freedom
Null hypothesis probability = 0.524
Photon flux (15-150 keV) in 10.62 sec: 1.32268 ( -0.07024 0.05717 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.69868e-07 ( -4.77295e-08 4.36216e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.072 sec. to 1.072 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40447 ( -0.100665 0.101274 )
Norm@50keV : 2.268894E-02 ( -1.330821E-03 1.328584E-03) )
------------------------------------------------------------
Chi-Squared = 63.88923 using 59 PHA bins.
Reduced chi-squared = 1.120864 for 57 degrees of freedom
Null hypothesis probability = 0.247
Photon flux (15-150 keV) in 1.000 sec: 2.76590 ( -0.16303 0.16321 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.19065e-07 ( -1.4308e-08 1.4355e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.072 sec. to 1.072 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.501804 ( -0.511552 0.456390 )
Epeak [keV] : 86.2484 ( -14.8167 36.0375 )
Norm@50keV : 6.237690E-02 ( -2.451976E-02 4.664433E-02) )
------------------------------------------------------------
Chi-Squared = 51.30172 using 59 PHA bins.
Reduced chi-squared = 0.9161022 for 56 degrees of freedom
Null hypothesis probability = 0.653
Photon flux (15-150 keV) in 1.000 sec: 2.65760 ( -0.17204 0.17179 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.07224e-07 ( -1.5866e-08 1.5716e-08 ) ergs/cm2
Band function
Time interval is from 0.072 sec. to 1.072 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.503063 ( -0.455120 0.512963 )
beta : -9.22256 ( -0.777445 7.43680 )
Epeak [keV] : 86.2543 ( -14.8324 36.1260 )
Norm@50keV : 6.230875E-02 ( -2.442421E-02 4.674344E-02) )
------------------------------------------------------------
Chi-Squared = 51.30202 using 59 PHA bins.
Reduced chi-squared = 0.9327641 for 55 degrees of freedom
Null hypothesis probability = 0.617
Photon flux (15-150 keV) in 1.000 sec: 2.65795 ( -0.17223 0.17145 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.07004e-07 ( -1.5751e-08 1.5798e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 02:01:03 EST 2008