batgrbproduct Analysis for Trigger=287344
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): Fri Dec 14 09:40:33 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger287344/SDC
======================================================================
Trigger: 00287344 Segment: 000
BAT Trigger Time: 208380139.52 [s; MET]
Trigger Stop: 208380140.544 [s; MET]
UTC: 2007-08-09T19:22:17.375600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 203.781773398037 Dec: -22.1339357183962 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.98
Image Trigger?: NO
Rate S/N Ratio: 19.157244060668 [ if not an image trigger ]
Image S/N Ratio: 10.98
Flight Position: [ source = BAT ]
RA: 203.781773398037 Dec: -22.1339357183962 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 203.769226297958 Dec: -22.1187204065863 [deg; J2000]
{ 13h 35m 04.6s , -22d 07' 07.4" }
+/- 1.69718872787617 [arcmin] (estimated 90% radius based on SNR)
+/- 0.604910426749558 [arcmin] (formal 1-sigma fit error)
SNR: 14.2867178404555
RA = 13h 35m 4.6s (203.769226 deg.)
Dec = -22d 7' 7" (-22.118720 deg.)
Angular difference between Flight and Ground position is 1.148811 arcmin
Partial Coding Fraction: 0.7421875 [ including projection effects ]
Duration
T90: 1.216000020504 +/- 0.271528985262434
Measured from: -0.224000006914139
to: 0.992000013589859 [s; relative to TRIGTIME]
T50: 0.512000024318695 +/- 0.143108347361266
Measured from: 0.223999977111816
to: 0.736000001430511 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0759999752044678
to: 1.07599997520447 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.351999998092651
to: 1.11999997496605 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.059130 0.073700 0.035288 0.018453
0.006975 0.007313 0.006268 0.005223 [error]
Peak 0.047778 0.059847 0.030805 0.013839
0.005772 0.006087 0.005257 0.004315 [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 1.67e-08 2.71e-08 3.36e-08 8.19e-08 1.01e-07 1.58e-07 erg/cm2
Error 3.19e-09 3.31e-09 6.25e-09 3.18e-08 1.46e-08 3.75e-08 erg/cm2
Peak flux Power-law 4.37e-01 4.13e-01 2.72e-01 2.78e-01 1.24e+00 1.40e+00 ph/cm2/s
Error 8.69e-02 5.16e-02 4.58e-02 9.42e-02 1.51e-01 1.73e-01 ph/cm2/s
Fluence Cutoff-PL 1.68e-08 2.72e-08 3.36e-08 8.13e-08 1.01e-07 1.34e-07 erg/cm2
Error 3.19e-09 3.31e-09 6.26e-09 3.16e-08 1.46e-08 5.51e-08 erg/cm2
Peak flux Cutoff-PL 4.34e-01 4.18e-01 2.73e-01 2.53e-01 1.23e+00 1.38e+00 ph/cm2/s
Error 8.90e-02 6.31e-02 4.81e-02 1.89e-01 1.51e-01 2.21e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 4.14e-01 4.38e-01 2.69e-01 2.43e-01 1.22e+00 1.36e+00 ph/cm2/s
Error 1.04e-01 7.16e-02 4.90e-02 1.83e-01 1.55e-01 2.00e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.695 0.225 - - 7.38e-03 1.00e-03 53.425 57
CPL 1.634 0.877 279.0 0.0 7.94e-03 1.37e-02 53.452 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.604 0.217 - - 9.60e-03 1.25e-03 50.215 57
CPL 1.521 0.872 262.8 5000.0 1.07e-02 1.44e-02 50.198 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: 0.576000 sec.
T50 in the 50-300 keV band: 0.320000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.472 -0.352 1.120
T90 1.216 -0.224 0.992
T50 0.512 0.224 0.736
Peak 1.000 0.076 1.076
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
203.7692 -22.1187 0.0135 18.8 108.7 0.1897 14.3 TRIG_00287344
------------------------------------------
Foreground time interval of the image:
-0.352 1.120 (delta_t = 1.472 [sec])
Background time interval of the image:
-239.520 -0.352 (delta_t = 239.168 [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 -0.352 sec. to 1.120 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69505 ( -0.221229 0.229025 )
Norm@50keV : 7.375500E-03 ( -1.017253E-03 9.921496E-04) )
------------------------------------------------------------
Chi-Squared = 53.42522 using 59 PHA bins.
Reduced chi-squared = 0.9372845 for 57 degrees of freedom
Null hypothesis probability = 0.610
Photon flux (15-150 keV) in 1.472 sec: 0.977862 ( -0.119466 0.119548 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00549e-07 ( -1.44494e-08 1.47413e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.352 sec. to 1.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63393 ( -0.985639 0.767614 )
Epeak [keV] : 278.972 ( )
Norm@50keV : 7.935994E-03 ( -7.438229E-03 1.992349E-02) )
------------------------------------------------------------
Chi-Squared = 53.45164 using 59 PHA bins.
Reduced chi-squared = 0.9544936 for 56 degrees of freedom
Null hypothesis probability = 0.572
Photon flux (15-150 keV) in 1.472 sec: 0.977573 ( -0.119427 0.119507 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00568e-07 ( -1.44662e-08 1.47125e-08 ) ergs/cm2
Band function
Time interval is from -0.352 sec. to 1.120 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.28747 ( -8.71253 3.50394 )
beta : -1.84408 ( -8.15592 0.363463 )
Epeak [keV] : 68.8386 ( -68.7386 176.120 )
Norm@50keV : 1.284974E-02 ( -6.229935E-03 1429.26 )
------------------------------------------------------------
Chi-Squared = 53.25408 using 59 PHA bins.
Reduced chi-squared = 0.9682559 for 55 degrees of freedom
Null hypothesis probability = 0.542
Photon flux (15-150 keV) in 1.472 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.096 sec. to 1.056 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60420 ( -0.214208 0.218998 )
Norm@50keV : 9.603338E-03 ( -1.261600E-03 1.240796E-03) )
------------------------------------------------------------
Chi-Squared = 50.21491 using 59 PHA bins.
Reduced chi-squared = 0.8809633 for 57 degrees of freedom
Null hypothesis probability = 0.726
Photon flux (15-150 keV) in 0.9600 sec: 1.23568 ( -0.15098 0.15109 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.62009e-08 ( -1.21415e-08 1.22615e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.096 sec. to 1.056 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52142 ( -1.00319 0.741409 )
Epeak [keV] : 262.755 ( -262.745 9737.25 )
Norm@50keV : 1.065530E-02 ( -2.294440E-03 2.647190E-02) )
------------------------------------------------------------
Chi-Squared = 50.19752 using 59 PHA bins.
Reduced chi-squared = 0.8963843 for 56 degrees of freedom
Null hypothesis probability = 0.693
Photon flux (15-150 keV) in 0.9600 sec: 1.23334 ( -0.14964 0.15207 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.5627e-08 ( -1.40719e-08 1.27893e-08 ) ergs/cm2
Band function
Time interval is from 0.096 sec. to 1.056 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.921901 ( -9.07810 5.55727 )
beta : -1.75935 ( -8.24065 0.336876 )
Epeak [keV] : 58.0700 ( -47.9700 1746.52 )
Norm@50keV : 2.521831E-02 ( -0.180192 418.590 )
------------------------------------------------------------
Chi-Squared = 49.61891 using 59 PHA bins.
Reduced chi-squared = 0.9021620 for 55 degrees of freedom
Null hypothesis probability = 0.680
Photon flux (15-150 keV) in 0.9600 sec: 1.22433 ( -0.15554 0.1536 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.45148e-08 ( -1.34294e-08 1.37672e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 09:57:23 EST 2007