batgrbproduct Analysis for Trigger=297434
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): Sat Dec 15 02:16:57 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger297434/GCN5_download_cron
======================================================================
Trigger: 00297434 Segment: 000
BAT Trigger Time: 217775208.06 [s; MET]
Trigger Stop: 217775208.076 [s; MET]
UTC: 2007-11-26T13:06:45.671340 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 286.811431501061 Dec: 9.30966572465667 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 16.35
Image Trigger?: NO
Rate S/N Ratio: 89.6437393240599 [ if not an image trigger ]
Image S/N Ratio: 16.35
Flight Position: [ source = BAT ]
RA: 286.811431501061 Dec: 9.30966572465667 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 286.81342313404 Dec: 9.28978122841605 [deg; J2000]
{ 19h 07m 15.2s , +09d 17' 23.2" }
+/- 4.71252459530273 [arcmin] (estimated 90% radius based on SNR)
+/- 2.67637930332383 [arcmin] (formal 1-sigma fit error)
SNR: 3.32144817277565
RA = 19h 7m 15.2s (286.813423 deg.)
Dec = 9d 17' 23" (9.289781 deg.)
Angular difference between Flight and Ground position is 1.198884 arcmin
Partial Coding Fraction: 0.265625 [ including projection effects ]
Duration
T90: 950.032000005245 +/- 671.684978284622
Measured from: -0.00400000810623169
to: 950.027999997139 [s; relative to TRIGTIME]
T50: 950.032000005245 +/- 671.740133095873
Measured from: -0.00400000810623169
to: 950.027999997139 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 949.039999991655
to: 950.039999991655 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.00400000810623169
to: 950.027999997139 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.135408 0.060635 -0.005015 0.202586
0.161478 0.159003 0.137992 0.117951 [error]
Peak 0.113102 0.088830 0.029252 0.002042
0.006541 0.006197 0.004749 0.003682 [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 3.31e-08 3.88e-08 3.28e-08 4.69e-08 1.21e-07 1.51e-07 erg/cm2
Error 5.74e-08 5.90e-08 8.27e-08 3.05e-06 2.24e-07 3.08e-06 erg/cm2
Peak flux Power-law 1.47e+00 7.41e-01 2.31e-01 9.18e-02 2.49e+00 2.53e+00 ph/cm2/s
Error 1.66e-01 6.35e-02 3.89e-02 2.83e-02 2.10e-01 2.11e-01 ph/cm2/s
Fluence Cutoff-PL 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 Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Fluence Band 3.44e-08 1.64e-07 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 3.05e-06 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.32e+00 8.26e-01 2.12e-01 2.30e-02 2.38e+00 2.38e+00 ph/cm2/s
Error 1.53e-01 6.39e-02 4.85e-02 3.12e-02 2.12e-01 2.17e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.243 6.500 - - 1.36e-05 2.44e-05 59.998 57
CPL 1.980 0.000 1.0 0.0 2.89e-05 0.00e+00 59.974 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.683 0.179 - - 1.13e-02 1.44e-03 58.562 57
CPL 1.537 0.000 15.6 0.0 5.49e-02 0.00e+00 51.656 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: 0.320000 sec.
T50 in the 50-300 keV band: 0.192000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 950.032 -0.004 950.028
T90 950.032 -0.004 950.028
T50 950.032 -0.004 950.028
Peak 1.000 949.040 950.040
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
286.8134 +9.2898 0.0578 39.8 -55.8 0.1801 3.3 TRIG_00297434
------------------------------------------
Foreground time interval of the image:
0.056 7.001 (delta_t = 6.945 [sec])
Background time interval of the image:
-104.799 0.056 (delta_t = 104.855 [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
Multiple GTIs in the spectrum
tstart tstop
0.056000 464.610000
466.000000 466.050000
467.000000 479.990000
481.000000 950.088000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.24319 ( -5.24319 7.75681 )
Norm@50keV : 1.355990E-05 ( -1.355990E-05 3.519874E-05) )
------------------------------------------------------------
Chi-Squared = 59.99752 using 59 PHA bins.
Reduced chi-squared = 1.052588 for 57 degrees of freedom
Null hypothesis probability = 0.368
Photon flux (15-150 keV) in 946.7 sec: 2.292518E-03 ( -0.00229252 0.00452083 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21305e-07 ( -1.21305e-07 3.26048e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.056000 464.610000
466.000000 466.050000
467.000000 479.990000
481.000000 950.088000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98039 ( )
Epeak [keV] : 1.01788 ( )
Norm@50keV : 2.889378E-05 ( )
------------------------------------------------------------
Chi-Squared = 59.97448 using 59 PHA bins.
Reduced chi-squared = 1.070973 for 56 degrees of freedom
Null hypothesis probability = 0.334
Photon flux (15-150 keV) in 946.7 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.056000 464.610000
466.000000 466.050000
467.000000 479.990000
481.000000 950.088000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.990893 ( -15.0000 0.00000 )
beta : -2.00769 ( -5.07606 14.9239 )
Epeak [keV] : 79.1091 ( -24.5096 9975.39 )
Norm@50keV : 3.171267E-05 ( -6.47523 58758.2 )
------------------------------------------------------------
Chi-Squared = 60.12928 using 59 PHA bins.
Reduced chi-squared = 1.093260 for 55 degrees of freedom
Null hypothesis probability = 0.295
Photon flux (15-150 keV) in 946.7 sec: 2.693819E-03 ( -0.00269382 0.0043631 ) 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 949.108 sec. to 950.092 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.68291 ( -0.172688 0.185083 )
Norm@50keV : 1.128641E-02 ( -1.449995E-03 1.431755E-03) )
------------------------------------------------------------
Chi-Squared = 58.56224 using 59 PHA bins.
Reduced chi-squared = 1.027408 for 57 degrees of freedom
Null hypothesis probability = 0.418
Photon flux (15-150 keV) in 0.9840 sec: 2.49066 ( -0.20998 0.21047 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17432e-07 ( -1.04924e-08 1.06469e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 949.108 sec. to 950.092 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53683 ( )
Epeak [keV] : 15.6061 ( )
Norm@50keV : 5.490420E-02 ( )
------------------------------------------------------------
Chi-Squared = 51.65596 using 59 PHA bins.
Reduced chi-squared = 0.9224278 for 56 degrees of freedom
Null hypothesis probability = 0.640
Photon flux (15-150 keV) in 0.9840 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 949.108 sec. to 950.092 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.73321 ( -8.572304E-02 8.009052E-02) )
beta : -7.63130 ( -2.36870 4.64875 )
Epeak [keV] : 10.4070 ( -5.15352 16.4109 )
Norm@50keV : 4.341193E-02 ( -6.768268E-03 8.710530E-02) )
------------------------------------------------------------
Chi-Squared = 51.88219 using 59 PHA bins.
Reduced chi-squared = 0.9433126 for 55 degrees of freedom
Null hypothesis probability = 0.595
Photon flux (15-150 keV) in 0.9840 sec: 2.38048 ( -0.20191 0.22147 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09629e-07 ( -9.72094e-09 1.09844e-08 ) ergs/cm2
Plot creation:
Sat Dec 15 02:35:55 EST 2007