batgrbproduct Analysis for Trigger=297114
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 01:28:11 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger297114/GCN5_download_cron
======================================================================
Trigger: 00297114 Segment: 000
BAT Trigger Time: 217387408 [s; MET]
Trigger Stop: 217387472 [s; MET]
UTC: 2007-11-22T01:23:25.621540 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 276.58149464452 Dec: 47.063184122741 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.13
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.13
Flight Position: [ source = BAT ]
RA: 276.58149464452 Dec: 47.063184122741 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 276.575930515608 Dec: 47.1018659643766 [deg; J2000]
{ 18h 26m 18.2s , +47d 06' 06.7" }
+/- 2.35109624491678 [arcmin] (estimated 90% radius based on SNR)
+/- 1.10232881581768 [arcmin] (formal 1-sigma fit error)
SNR: 8.96875340013875
RA = 18h 26m 18.2s (276.575931 deg.)
Dec = 47d 6' 7" (47.101866 deg.)
Angular difference between Flight and Ground position is 2.332017 arcmin
Partial Coding Fraction: 0.6953125 [ including projection effects ]
Duration
T90: 68.6920000016689 +/- 14.3955353918202
Measured from: -22.7240000069141
to: 45.9679999947548 [s; relative to TRIGTIME]
T50: 23.2319999933243 +/- 13.8480764056138
Measured from: -8.06799998879433
to: 15.16400000453 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.99599999189377
to: 3.99599999189377 [s; relative to TRIGTIME]
Total Fluence
Measured from: -29.4120000004768
to: 47.2599999904633 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.407391 0.309558 0.226621 0.005850
0.056396 0.056157 0.049006 0.042372 [error]
Peak 0.026136 0.010278 0.009408 0.002868
0.006616 0.006455 0.005530 0.004787 [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 1.03e-07 1.61e-07 1.89e-07 4.28e-07 5.78e-07 8.84e-07 erg/cm2
Error 2.65e-08 2.66e-08 4.81e-08 2.27e-07 1.12e-07 2.72e-07 erg/cm2
Peak flux Power-law 2.50e-01 1.33e-01 4.44e-02 1.91e-02 4.38e-01 4.47e-01 ph/cm2/s
Error 1.24e-01 7.33e-02 4.83e-02 4.82e-02 1.65e-01 1.73e-01 ph/cm2/s
Fluence Cutoff-PL 1.01e-07 1.64e-07 1.90e-07 3.42e-07 5.72e-07 7.67e-07 erg/cm2
Error 2.92e-08 3.15e-08 5.03e-08 3.43e-07 1.18e-07 3.44e-07 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 1.00e-07 1.63e-07 1.90e-07 3.40e-07 5.72e-07 7.31e-07 erg/cm2
Error 2.89e-08 3.17e-08 5.02e-08 3.42e-07 1.18e-07 3.15e-07 erg/cm2
Peak flux Band 2.50e-01 1.33e-01 4.47e-01 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 1.24e-01 1.73e-01 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.769 0.308 - - 8.17e-04 1.53e-04 67.712 57
CPL 1.423 0.937 79.4 0.0 1.25e-03 1.74e-03 67.767 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.571 1.472 - - 2.12e-03 1.91e-03 47.298 57
CPL 1.985 0.000 3.2 0.0 3.46e-03 0.00e+00 48.029 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 76.672 -29.412 47.260
T90 68.692 -22.724 45.968
T50 23.232 -8.068 15.164
Peak 1.000 2.996 3.996
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
276.5759 +47.1019 0.0214 31.7 8.6 1.0886 9.0 TRIG_00297114
------------------------------------------
Foreground time interval of the image:
-29.412 47.260 (delta_t = 76.672 [sec])
Background time interval of the image:
-239.000 -29.412 (delta_t = 209.588 [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 -29.412 sec. to 47.260 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76935 ( -0.299611 0.316559 )
Norm@50keV : 8.172088E-04 ( -1.557018E-04 1.505585E-04) )
------------------------------------------------------------
Chi-Squared = 67.71218 using 59 PHA bins.
Reduced chi-squared = 1.187933 for 57 degrees of freedom
Null hypothesis probability = 0.157
Photon flux (15-150 keV) in 76.67 sec: 0.111299 ( -0.0185955 0.018621 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.77577e-07 ( -1.10826e-07 1.13066e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -29.412 sec. to 47.260 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42276 ( -1.01944 0.853827 )
Epeak [keV] : 79.4118 ( )
Norm@50keV : 1.246259E-03 ( -2.420055E-04 3.236253E-03) )
------------------------------------------------------------
Chi-Squared = 67.76717 using 59 PHA bins.
but latest trial 2.15728 gives Chi-Squared = 0.692505
Reduced chi-squared = 1.210128 for 56 degrees of freedom
Null hypothesis probability = 0.135
Photon flux (15-150 keV) in 76.67 sec: 0.110772 ( -0.009526 0.01882 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.72196e-07 ( -1.18602e-07 1.17262e-07 ) ergs/cm2
Band function
Time interval is from -29.412 sec. to 47.260 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.49456 ( -8.50544 1.07628 )
beta : -8.50242 ( -1.49758 7.03236 )
Epeak [keV] : 87.7336 ( -260.978 9738.92 )
Norm@50keV : 1.142287E-03 ( -1.989623E-04 3.283532E-03) )
------------------------------------------------------------
Chi-Squared = 67.70638 using 59 PHA bins.
Reduced chi-squared = 1.231025 for 55 degrees of freedom
Null hypothesis probability = 0.117
Photon flux (15-150 keV) in 76.67 sec: 0.110764 ( -0.0190126 0.018934 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.7156e-07 ( -1.18417e-07 1.16886e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 2.996 sec. to 3.996 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.57130 ( -0.982944 1.96102 )
Norm@50keV : 2.120188E-03 ( -2.120188E-03 1.698171E-03) )
------------------------------------------------------------
Chi-Squared = 47.29765 using 59 PHA bins.
Reduced chi-squared = 0.8297833 for 57 degrees of freedom
Null hypothesis probability = 0.817
Photon flux (15-150 keV) in 1.000 sec: 0.438377 ( -0.165938 0.163677 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.16603e-08 ( -2.16603e-08 1.34401e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.996 sec. to 3.996 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98456 ( )
Epeak [keV] : 3.24468 ( )
Norm@50keV : 3.464078E-03 ( )
------------------------------------------------------------
Chi-Squared = 48.02885 using 59 PHA bins.
but latest trial -0.452344 gives Chi-Squared = 2.41484
Reduced chi-squared = 0.8576581 for 56 degrees of freedom
Null hypothesis probability = 0.767
Photon flux (15-150 keV) in 1.000 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 2.996 sec. to 3.996 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.95948 ( -7.00388 7.99612 )
beta : -6.54996 ( -1.93502 1.00746 )
Epeak [keV] : 11.9588 ( -11.8588 9988.04 )
Norm@50keV : 3.353596E-03 ( -0.285445 0.233473 )
------------------------------------------------------------
Chi-Squared = 48.10355 using 59 PHA bins.
Reduced chi-squared = 0.8746099 for 55 degrees of freedom
Null hypothesis probability = 0.733
Photon flux (15-150 keV) in 1.000 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Sat Dec 15 01:47:54 EST 2007