batgrbproduct Analysis for Trigger=297628
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 02:36:54 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger297628/GCN5_download_cron
======================================================================
Trigger: 00297628 Segment: 000
BAT Trigger Time: 217987437.696 [s; MET]
Trigger Stop: 217987441.792 [s; MET]
UTC: 2007-11-29T00:03:55.301720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 220.089670547025 Dec: -26.6590902014323 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.85
Image Trigger?: NO
Rate S/N Ratio: 11.5325625946708 [ if not an image trigger ]
Image S/N Ratio: 11.85
Flight Position: [ source = BAT ]
RA: 220.089670547025 Dec: -26.6590902014323 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 220.038878335618 Dec: -26.6665985909579 [deg; J2000]
{ 14h 40m 09.3s , -26d 39' 59.8" }
+/- 2.16899913036765 [arcmin] (estimated 90% radius based on SNR)
+/- 1.18557541477504 [arcmin] (formal 1-sigma fit error)
SNR: 10.0634719436054
RA = 14h 40m 9.3s (220.038878 deg.)
Dec = -26d 39' 60" (-26.666599 deg.)
Angular difference between Flight and Ground position is 2.760475 arcmin
Partial Coding Fraction: 0.5546875 [ including projection effects ]
Duration
T90: 422.988000005484 +/- 98.4785398877287
Measured from: -0.272000014781952
to: 422.715999990702 [s; relative to TRIGTIME]
T50: 189.788000017405 +/- 29.5705878198307
Measured from: 16.0959999859333
to: 205.884000003338 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5.83199998736382
to: 6.83199998736382 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.63600000739098
to: 522.34399998188 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.262737 2.523444 1.341404 0.259013
0.161956 0.161131 0.145841 0.139135 [error]
Peak 0.030609 0.028354 0.046239 0.013142
0.007410 0.007700 0.007159 0.006280 [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 7.46e-07 1.05e-06 1.09e-06 2.09e-06 3.54e-06 4.98e-06 erg/cm2
Error 9.11e-08 8.14e-08 1.44e-07 5.66e-07 3.24e-07 7.03e-07 erg/cm2
Peak flux Power-law 2.64e-01 2.89e-01 2.26e-01 2.90e-01 8.87e-01 1.07e+00 ph/cm2/s
Error 1.00e-01 6.66e-02 5.80e-02 1.59e-01 1.87e-01 2.30e-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 2.31e-01 3.00e-01 2.41e-01 1.77e-01 8.66e-01 9.50e-01 ph/cm2/s
Error 1.81e-01 7.55e-02 7.49e-02 1.95e-01 2.00e-01 2.80e-01 ph/cm2/s
Fluence Band 7.27e-07 1.04e-06 1.10e-06 2.13e-06 3.56e-06 5.08e-06 erg/cm2
Error 8.11e-08 1.08e-07 3.56e-07 2.94e-07 5.40e-07 0.00e+00 erg/cm2
Peak flux Band 2.31e-01 2.99e-01 2.41e-01 1.78e-01 8.66e-01 9.49e-01 ph/cm2/s
Error 1.81e-01 7.55e-02 7.49e-02 2.03e-01 2.01e-01 3.03e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.942 0.156 - - 7.30e-04 6.85e-05 44.840 57
CPL 1.331 0.000 48.0 0.0 1.57e-03 0.00e+00 44.968 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.356 0.377 - - 7.35e-03 1.53e-03 70.365 57
CPL 0.799 1.903 120.0 5000.0 1.33e-02 6.89e-02 70.029 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: 177.728000 sec.
T50 in the 50-300 keV band: 98.176000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 527.980 -5.636 522.344
T90 422.988 -0.272 422.716
T50 189.788 16.096 205.884
Peak 1.000 5.832 6.832
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
220.0389 -26.6666 0.0192 28.2 -109.6 6.6837 10.1 TRIG_00297628
------------------------------------------
Foreground time interval of the image:
-5.636 522.344 (delta_t = 527.980 [sec])
Background time interval of the image:
-140.395 -5.636 (delta_t = 134.759 [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 -5.636 sec. to 522.344 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94194 ( -0.153153 0.158109 )
Norm@50keV : 7.297622E-04 ( -6.913609E-05 6.789580E-05) )
------------------------------------------------------------
Chi-Squared = 44.83976 using 59 PHA bins.
Reduced chi-squared = 0.7866625 for 57 degrees of freedom
Null hypothesis probability = 0.879
Photon flux (15-150 keV) in 528.0 sec: 0.106643 ( -0.00844219 0.008455 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.54494e-06 ( -3.21816e-07 3.27033e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.636 sec. to 522.344 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33113 ( )
Epeak [keV] : 48.0010 ( )
Norm@50keV : 1.565168E-03 ( )
------------------------------------------------------------
Chi-Squared = 44.96840 using 59 PHA bins.
Reduced chi-squared = 0.8030071 for 56 degrees of freedom
Null hypothesis probability = 0.854
Photon flux (15-150 keV) in 528.0 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -5.636 sec. to 522.344 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.81558 ( -8.18442 0.844896 )
beta : -8.89058 ( -1.10942 7.08753 )
Epeak [keV] : 61.1440 ( -51.0440 9948.86 )
Norm@50keV : 8.629549E-04 ( -3.163571E-04 1.475908E-03) )
------------------------------------------------------------
Chi-Squared = 44.35321 using 59 PHA bins.
Reduced chi-squared = 0.8064220 for 55 degrees of freedom
Null hypothesis probability = 0.847
Photon flux (15-150 keV) in 528.0 sec: 0.105106 ( -0.00901445 0.008993 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.5553e-06 ( -2.77548e-07 3.10585e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 5.832 sec. to 6.832 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35585 ( -0.373350 0.379767 )
Norm@50keV : 7.354218E-03 ( -1.539476E-03 1.528056E-03) )
------------------------------------------------------------
Chi-Squared = 70.36466 using 59 PHA bins.
Reduced chi-squared = 1.234468 for 57 degrees of freedom
Null hypothesis probability = 0.110
Photon flux (15-150 keV) in 1.000 sec: 0.887045 ( -0.186851 0.187555 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.17113e-08 ( -1.66464e-08 1.69632e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.832 sec. to 6.832 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.799066 ( -2.50124 1.30512 )
Epeak [keV] : 120.005 ( -119.995 9880.00 )
Norm@50keV : 1.328613E-02 ( -1.328613E-02 0.124505 )
------------------------------------------------------------
Chi-Squared = 70.02926 using 59 PHA bins.
Reduced chi-squared = 1.250522 for 56 degrees of freedom
Null hypothesis probability = 9.843E-02
Photon flux (15-150 keV) in 1.000 sec: 0.865763 ( -0.205246 0.195157 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.03149e-08 ( -1.73953e-08 1.74397e-08 ) ergs/cm2
Band function
Time interval is from 5.832 sec. to 6.832 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.804686 ( -9.19531 1.61264 )
beta : -8.75823 ( -1.24177 7.75102 )
Epeak [keV] : 120.853 ( -59.2635 9879.15 )
Norm@50keV : 1.319691E-02 ( -1.319691E-02 0.124754 )
------------------------------------------------------------
Chi-Squared = 70.02930 using 59 PHA bins.
Reduced chi-squared = 1.273260 for 55 degrees of freedom
Null hypothesis probability = 8.344E-02
Photon flux (15-150 keV) in 1.000 sec: 0.866079 ( -0.204881 0.196831 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.01898e-08 ( -1.73184e-08 1.75307e-08 ) ergs/cm2
Plot creation:
Sat Dec 15 02:55:43 EST 2007