batgrbproduct Analysis for Trigger=260304
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): Thu Dec 13 13:17:34 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger260304/GCN5_download_cron
======================================================================
Trigger: 00260304 Segment: 000
BAT Trigger Time: 193002936 [s; MET]
Trigger Stop: 193003256 [s; MET]
UTC: 2007-02-12T19:55:34.239780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 299.95071696654 Dec: 34.913974860868 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.25
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.25
Flight Position: [ source = BAT ]
RA: 299.95071696654 Dec: 34.913974860868 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 299.964937755881 Dec: 34.9270079753423 [deg; J2000]
{ 19h 59m 51.6s , +34d 55' 37.2" }
+/- 3.5894879657619 [arcmin] (estimated 90% radius based on SNR)
+/- 1.93272144785869 [arcmin] (formal 1-sigma fit error)
SNR: 4.90021128586274
RA = 19h 59m 51.6s (299.964938 deg.)
Dec = 34d 55' 37" (34.927008 deg.)
Angular difference between Flight and Ground position is 1.049270 arcmin
Partial Coding Fraction: 0.09765625 [ including projection effects ]
Duration
T90: 419.008000016212 +/- 38.1175881940934
Measured from: 30.1839999854565
to: 449.192000001669 [s; relative to TRIGTIME]
T50: 245.631999999285 +/- 46.3092077089747
Measured from: 121.576000005007
to: 367.208000004292 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 20.2439999878407
to: 21.2439999878407 [s; relative to TRIGTIME]
Total Fluence
Measured from: 20.2639999985695
to: 466.152000010014 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.998945 4.383640 3.216574 1.315877
0.361562 0.365970 0.324812 0.284247 [error]
Peak 0.038282 0.041445 0.027923 0.044883
0.019301 0.020017 0.016309 0.015244 [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 1.35e-06 2.21e-06 2.75e-06 6.75e-06 8.21e-06 1.30e-05 erg/cm2
Error 2.21e-07 2.21e-07 3.16e-07 1.66e-06 7.80e-07 1.89e-06 erg/cm2
Peak flux Power-law 4.38e-01 4.13e-01 2.71e-01 2.75e-01 1.23e+00 1.40e+00 ph/cm2/s
Error 3.47e-01 3.13e-01 1.08e-01 2.02e-01 6.22e-01 6.10e-01 ph/cm2/s
Fluence Cutoff-PL 1.27e-06 2.28e-06 2.84e-06 4.49e-06 8.12e-06 1.07e-05 erg/cm2
Error 2.66e-07 2.58e-07 3.67e-07 3.00e-06 8.07e-07 3.08e-06 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 1.25e-06 2.30e-06 2.73e-06 6.22e-06 8.12e-06 1.25e-05 erg/cm2
Error 2.71e-07 2.64e-07 3.04e-07 1.90e-06 7.85e-07 2.08e-06 erg/cm2
Peak flux Band 3.61e-01 4.35e-01 3.09e-01 2.28e-01 1.15e+00 1.34e+00 ph/cm2/s
Error 2.72e-01 1.58e-01 2.49e-01 7.73e-01 1.00e+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 1.689 0.159 - - 1.99e-03 1.83e-04 68.894 57
CPL 1.360 0.571 103.6 4968.4 2.87e-03 1.92e-03 68.044 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.609 0.666 - - 9.58e-03 4.06e-03 66.522 57
CPL 1.286 0.000 143.6 0.0 1.30e-02 0.00e+00 66.490 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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 445.888 20.264 466.152
T90 419.008 30.184 449.192
T50 245.632 121.576 367.208
Peak 1.000 20.244 21.244
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
299.9649 +34.9270 0.0394 55.7 -6.5 6.9276 4.9 TRIG_00260304
------------------------------------------
Foreground time interval of the image:
20.264 466.152 (delta_t = 445.888 [sec])
Background time interval of the image:
-239.000 20.264 (delta_t = 259.264 [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 20.264 sec. to 466.152 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68901 ( -0.158392 0.159875 )
Norm@50keV : 1.987019E-03 ( -1.836868E-04 1.830596E-04) )
------------------------------------------------------------
Chi-Squared = 68.89354 using 59 PHA bins.
Reduced chi-squared = 1.208659 for 57 degrees of freedom
Null hypothesis probability = 0.134
Photon flux (15-150 keV) in 445.9 sec: 0.262893 ( -0.026302 0.026449 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.21103e-06 ( -7.78541e-07 7.81351e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 20.264 sec. to 466.152 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.36004 ( -0.682285 0.460226 )
Epeak [keV] : 103.643 ( -40.4940 9896.36 )
Norm@50keV : 2.866651E-03 ( -7.166627E-04 3.116170E-03) )
------------------------------------------------------------
Chi-Squared = 68.04359 using 59 PHA bins.
but latest trial 41.0542 gives Chi-Squared = 3.06068
but latest trial 1.709117E-03 gives Chi-Squared = 7.16656
Reduced chi-squared = 1.215064 for 56 degrees of freedom
Null hypothesis probability = 0.130
Photon flux (15-150 keV) in 445.9 sec: 0.258887 ( -0.02722 0.013709 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.11605e-06 ( -8.1399e-07 8.00703e-07 ) ergs/cm2
Band function
Time interval is from 20.264 sec. to 466.152 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.32226 ( -0.498482 0.646253 )
beta : -9.01759 ( -0.982410 7.46123 )
Epeak [keV] : 98.4876 ( -34.6566 9901.51 )
Norm@50keV : 2.981000E-03 ( -1.143826E-03 3.010965E-03) )
------------------------------------------------------------
Chi-Squared = 68.05597 using 59 PHA bins.
Reduced chi-squared = 1.237381 for 55 degrees of freedom
Null hypothesis probability = 0.111
Photon flux (15-150 keV) in 445.9 sec: 0.258881 ( -0.027258 0.02739 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.11614e-06 ( -7.71853e-07 7.98696e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 20.264 sec. to 21.224 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60885 ( -0.709569 0.622030 )
Norm@50keV : 9.582595E-03 ( -4.194981E-03 3.931507E-03) )
------------------------------------------------------------
Chi-Squared = 66.52232 using 59 PHA bins.
Reduced chi-squared = 1.167058 for 57 degrees of freedom
Null hypothesis probability = 0.182
Photon flux (15-150 keV) in 0.9600 sec: 1.23483 ( -0.610194 0.6336 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.58706e-08 ( -3.41913e-08 3.42475e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 20.264 sec. to 21.224 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28579 ( )
Epeak [keV] : 143.646 ( )
Norm@50keV : 1.304925E-02 ( )
------------------------------------------------------------
Chi-Squared = 66.48973 using 59 PHA bins.
Reduced chi-squared = 1.187317 for 56 degrees of freedom
Null hypothesis probability = 0.159
Photon flux (15-150 keV) in 0.9600 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 20.264 sec. to 21.224 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.765579 ( -12.5944 2.40558 )
beta : -1.87543 ( -7.81267 1.15207 )
Epeak [keV] : 82.1366 ( -47.5094 9952.39 )
Norm@50keV : 2.310978E-02 ( -6.36804 4.09900 )
------------------------------------------------------------
Chi-Squared = 66.39400 using 59 PHA bins.
Reduced chi-squared = 1.207164 for 55 degrees of freedom
Null hypothesis probability = 0.140
Photon flux (15-150 keV) in 0.9600 sec: 1.14844 ( -0.560537 0.98602 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.67154e-08 ( -3.44689e-08 3.42437e-08 ) ergs/cm2
Plot creation:
Thu Dec 13 13:57:47 EST 2007