batgrbproduct Analysis for Trigger=291292
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 13:03:47 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger291292/SDC
======================================================================
Trigger: 00291292 Segment: 000
BAT Trigger Time: 211707238.912 [s; MET]
Trigger Stop: 211707239.936 [s; MET]
UTC: 2007-09-17T07:33:56.682320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 293.925010039201 Dec: 2.41308727492074 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 24.76
Image Trigger?: NO
Rate S/N Ratio: 167.16758058906 [ if not an image trigger ]
Image S/N Ratio: 24.76
Flight Position: [ source = BAT ]
RA: 293.925010039201 Dec: 2.41308727492074 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 293.921996231319 Dec: 2.42053735179925 [deg; J2000]
{ 19h 35m 41.3s , +02d 25' 13.9" }
+/- 0.567555679315967 [arcmin] (estimated 90% radius based on SNR)
+/- 0.189503259433573 [arcmin] (formal 1-sigma fit error)
SNR: 68.3179531149547
RA = 19h 35m 41.3s (293.921996 deg.)
Dec = 2d 25' 14" (2.420537 deg.)
Angular difference between Flight and Ground position is 0.482135 arcmin
Partial Coding Fraction: 0.7890625 [ including projection effects ]
Duration
T90: 7.70400002598763 +/- 1.1170317768283
Measured from: 0.215999990701675
to: 7.9200000166893 [s; relative to TRIGTIME]
T50: 2.4040000140667 +/- 0.130291998639656
Measured from: 0.787999987602234
to: 3.19200000166893 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.212000012397766
to: 1.21200001239777 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0519999861717224
to: 12.9000000059605 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.911072 1.245367 0.903446 0.197358
0.023938 0.024028 0.020985 0.015980 [error]
Peak 0.242691 0.384174 0.336017 0.090982
0.008786 0.009989 0.009678 0.006876 [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 2.87e-07 5.17e-07 7.16e-07 2.06e-06 2.06e-06 3.61e-06 erg/cm2
Error 1.59e-08 1.61e-08 2.25e-08 1.54e-07 5.50e-08 0.00e+00 erg/cm2
Peak flux Power-law 2.34e+00 2.74e+00 2.31e+00 3.29e+00 8.56e+00 1.07e+01 ph/cm2/s
Error 1.57e-01 1.08e-01 8.15e-02 2.61e-01 2.88e-01 3.41e-01 ph/cm2/s
Fluence Cutoff-PL 2.67e-07 5.23e-07 7.33e-07 1.49e-06 2.03e-06 3.00e-06 erg/cm2
Error 2.12e-08 1.71e-08 2.61e-08 3.76e-07 6.12e-08 3.80e-07 erg/cm2
Peak flux Cutoff-PL 2.20e+00 2.76e+00 2.36e+00 2.69e+00 8.45e+00 1.00e+01 ph/cm2/s
Error 2.08e-01 1.12e-01 1.03e-01 5.95e-01 3.07e-01 7.90e-01 ph/cm2/s
Fluence Band 2.65e-07 5.21e-07 7.31e-07 1.50e-06 2.03e-06 3.02e-06 erg/cm2
Error 2.09e-08 1.71e-08 2.60e-08 3.77e-07 6.11e-08 3.79e-07 erg/cm2
Peak flux Band 2.20e+00 2.76e+00 2.36e+00 2.69e+00 8.45e+00 1.00e+01 ph/cm2/s
Error 2.10e-01 1.13e-01 1.03e-01 5.52e-01 3.08e-01 7.15e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.531 0.051 - - 1.68e-02 4.35e-04 46.725 57
CPL 1.274 0.209 159.4 199.0 2.19e-02 4.62e-03 42.085 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.246 0.059 - - 7.24e-02 2.27e-03 39.653 57
CPL 1.038 0.237 269.8 4922.6 8.92e-02 2.09e-02 37.257 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: 5.248000 sec.
T50 in the 50-300 keV band: 1.856000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 12.952 -0.052 12.900
T90 7.704 0.216 7.920
T50 2.404 0.788 3.192
Peak 1.000 0.212 1.212
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
293.9220 +2.4205 0.0028 20.4 42.5 3.3218 68.3 TRIG_00291292
------------------------------------------
Foreground time interval of the image:
-0.052 12.900 (delta_t = 12.952 [sec])
Background time interval of the image:
-239.912 -0.052 (delta_t = 239.860 [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 -0.052 sec. to 12.900 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53076 ( -5.131114E-02 5.137968E-02) )
Norm@50keV : 1.684773E-02 ( -4.346035E-04 4.345961E-04) )
------------------------------------------------------------
Chi-Squared = 46.72545 using 59 PHA bins.
Reduced chi-squared = 0.8197447 for 57 degrees of freedom
Null hypothesis probability = 0.832
Photon flux (15-150 keV) in 12.95 sec: 2.12116 ( -0.06338 0.06369 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.05978e-06 ( -5.49598e-08 5.50375e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.052 sec. to 12.900 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27406 ( -0.213648 0.204404 )
Epeak [keV] : 159.415 ( -47.4678 350.589 )
Norm@50keV : 2.191369E-02 ( -4.044468E-03 5.187383E-03) )
------------------------------------------------------------
Chi-Squared = 42.08456 using 59 PHA bins.
Reduced chi-squared = 0.7515101 for 56 degrees of freedom
Null hypothesis probability = 0.916
Photon flux (15-150 keV) in 12.95 sec: 2.07603 ( -0.07139 0.07199 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.0269e-06 ( -6.05283e-08 6.18233e-08 ) ergs/cm2
Band function
Time interval is from -0.052 sec. to 12.900 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01150 ( -0.495037 3.19660 )
beta : -1.60497 ( -7.77101 0.687892 )
Epeak [keV] : 79.4371 ( -124.344 353.479 )
Norm@50keV : 3.223352E-02 ( -4.007863E-03 6.496521E-03) )
------------------------------------------------------------
Chi-Squared = 43.66233 using 59 PHA bins.
Reduced chi-squared = 0.7938606 for 55 degrees of freedom
Null hypothesis probability = 0.865
Photon flux (15-150 keV) in 12.95 sec: 2.07607 ( -0.07169 0.07213 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.02614e-06 ( -6.15384e-08 6.06448e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.212 sec. to 1.212 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24591 ( -5.931890E-02 5.918658E-02) )
Norm@50keV : 7.239312E-02 ( -2.270706E-03 2.269268E-03) )
------------------------------------------------------------
Chi-Squared = 39.65281 using 59 PHA bins.
Reduced chi-squared = 0.6956634 for 57 degrees of freedom
Null hypothesis probability = 0.961
Photon flux (15-150 keV) in 1.000 sec: 8.55650 ( -0.28814 0.28876 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.25234e-07 ( -2.4263e-08 2.4398e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.212 sec. to 1.212 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03814 ( -0.247254 0.226521 )
Epeak [keV] : 269.822 ( -114.994 9730.18 )
Norm@50keV : 8.924571E-02 ( -1.741359E-02 2.445085E-02) )
------------------------------------------------------------
Chi-Squared = 37.25670 using 59 PHA bins.
Reduced chi-squared = 0.6652982 for 56 degrees of freedom
Null hypothesis probability = 0.975
Photon flux (15-150 keV) in 1.000 sec: 8.45219 ( -0.30705 0.30749 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.19007e-07 ( -2.2945e-08 2.4091e-08 ) ergs/cm2
Band function
Time interval is from 0.212 sec. to 1.212 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.02917 ( -0.192360 0.240121 )
beta : -8.58219 ( -1.40781 7.37105 )
Epeak [keV] : 268.308 ( -112.456 9732.77 )
Norm@50keV : 8.966744E-02 ( -1.763850E-02 2.421522E-02) )
------------------------------------------------------------
Chi-Squared = 37.29259 using 59 PHA bins.
Reduced chi-squared = 0.6780471 for 55 degrees of freedom
Null hypothesis probability = 0.968
Photon flux (15-150 keV) in 1.000 sec: 8.45235 ( -0.308 0.30881 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.18482e-07 ( -2.5749e-08 2.5522e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 13:33:36 EST 2007