batgrbproduct Analysis for Trigger=202505
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): Mon Dec 31 15:24:07 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger202505/GCN5_download_cron
======================================================================
Trigger: 00202505 Segment: 000
BAT Trigger Time: 164817157.12 [s; MET]
Trigger Stop: 164817161.216 [s; MET]
UTC: 2006-03-23T14:32:36.031580 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 174.408567159494 Dec: 49.9749559287599 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.72
Image Trigger?: NO
Rate S/N Ratio: 12.0415945787923 [ if not an image trigger ]
Image S/N Ratio: 9.72
Flight Position: [ source = BAT ]
RA: 174.408567159494 Dec: 49.9749559287599 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 174.420890479974 Dec: 49.994577938263 [deg; J2000]
{ 11h 37m 41.0s , +49d 59' 40.5" }
+/- 1.50444554597878 [arcmin] (estimated 90% radius based on SNR)
+/- 0.612628687185986 [arcmin] (formal 1-sigma fit error)
SNR: 16.9716246698117
RA = 11h 37m 41.0s (174.420890 deg.)
Dec = 49d 59' 40" (49.994578 deg.)
Angular difference between Flight and Ground position is 1.269691 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 25.4080000221729 +/- 6.13132024239188
Measured from: -3.72800001502037
to: 21.6800000071526 [s; relative to TRIGTIME]
T50: 11.7759999930859 +/- 2.13897918792344
Measured from: 0.752000004053116
to: 12.527999997139 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.52399998903275
to: 3.52399998903275 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.13600000739098
to: 23.8560000061989 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.324342 0.361516 0.295910 0.025461
0.030374 0.031140 0.028092 0.026077 [error]
Peak 0.039643 0.029586 0.016489 0.006303
0.005785 0.005794 0.005438 0.004725 [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 8.77e-08 1.57e-07 2.16e-07 6.14e-07 6.22e-07 1.08e-06 erg/cm2
Error 1.43e-08 1.49e-08 2.86e-08 1.79e-07 6.69e-08 2.01e-07 erg/cm2
Peak flux Power-law 3.86e-01 2.55e-01 1.10e-01 6.50e-02 7.84e-01 8.17e-01 ph/cm2/s
Error 9.63e-02 5.21e-02 4.57e-02 5.18e-02 1.47e-01 1.59e-01 ph/cm2/s
Fluence Cutoff-PL 8.79e-08 1.57e-07 2.16e-07 6.08e-07 6.22e-07 9.92e-07 erg/cm2
Error 1.43e-08 1.49e-08 2.86e-08 1.78e-07 6.70e-08 2.88e-07 erg/cm2
Peak flux Cutoff-PL 3.86e-01 2.55e-01 1.10e-01 6.45e-02 7.84e-01 8.16e-01 ph/cm2/s
Error 9.63e-02 5.22e-02 4.57e-02 5.14e-02 1.47e-01 1.59e-01 ph/cm2/s
Fluence Band 8.71e-08 1.57e-07 2.15e-07 6.07e-07 6.22e-07 1.07e-06 erg/cm2
Error 1.44e-08 1.49e-08 2.86e-08 1.79e-07 6.69e-08 2.75e-07 erg/cm2
Peak flux Band 4.03e-01 2.67e-01 9.03e-02 3.97e-02 7.84e-01 8.17e-01 ph/cm2/s
Error 1.05e-01 5.86e-02 2.63e-02 2.11e-02 1.46e-01 1.75e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.545 0.179 - - 2.28e-03 2.20e-04 56.918 57
CPL 1.528 0.187 9977.1 0.0 2.31e-03 2.21e-04 56.971 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.216 0.436 - - 4.70e-03 1.45e-03 72.679 57
CPL 1.984 1.712 4.2 0.0 6.00e-03 9.36e+00 73.286 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: 17.792000 sec.
T50 in the 50-300 keV band: 9.920000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 28.992 -5.136 23.856
T90 25.408 -3.728 21.680
T50 11.776 0.752 12.528
Peak 1.000 2.524 3.524
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
174.4209 +49.9946 0.0112 18.4 119.0 1.0307 17.0 TRIG_00202505
------------------------------------------
Foreground time interval of the image:
-5.136 23.856 (delta_t = 28.992 [sec])
Background time interval of the image:
-239.120 -5.136 (delta_t = 233.984 [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 -5.136 sec. to 23.856 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54509 ( -0.177383 0.180223 )
Norm@50keV : 2.278016E-03 ( -2.210673E-04 2.184585E-04) )
------------------------------------------------------------
Chi-Squared = 56.91766 using 59 PHA bins.
Reduced chi-squared = 0.9985554 for 57 degrees of freedom
Null hypothesis probability = 0.478
Photon flux (15-150 keV) in 28.99 sec: 0.287976 ( -0.026763 0.026838 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.22465e-07 ( -6.68075e-08 6.70713e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.136 sec. to 23.856 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52775 ( -0.176202 0.198183 )
Epeak [keV] : 9977.07 ( )
Norm@50keV : 2.311919E-03 ( -2.246320E-04 2.177544E-04) )
------------------------------------------------------------
Chi-Squared = 56.97123 using 59 PHA bins.
but latest trial 1.35155 gives Chi-Squared = 0.571190
Reduced chi-squared = 1.017343 for 56 degrees of freedom
Null hypothesis probability = 0.439
Photon flux (15-150 keV) in 28.99 sec: 0.287863 ( -0.026753 0.026828 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.22273e-07 ( -6.66045e-08 6.73148e-08 ) ergs/cm2
Band function
Time interval is from -5.136 sec. to 23.856 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.20855 ( -8.79145 3.26794 )
beta : -1.54224 ( -0.184123 0.174778 )
Epeak [keV] : 39.0425 ( -38.9425 940.458 )
Norm@50keV : 4.614444E-03 ( -4.614444E-03 41.0690 )
------------------------------------------------------------
Chi-Squared = 56.92466 using 59 PHA bins.
Reduced chi-squared = 1.034994 for 55 degrees of freedom
Null hypothesis probability = 0.403
Photon flux (15-150 keV) in 28.99 sec: 0.287863 ( -0.026737 0.013385 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.21598e-07 ( -6.64973e-08 6.73757e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 2.544 sec. to 3.504 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.21558 ( -0.411374 0.460100 )
Norm@50keV : 4.696275E-03 ( -1.467145E-03 1.436064E-03) )
------------------------------------------------------------
Chi-Squared = 72.67851 using 59 PHA bins.
Reduced chi-squared = 1.275062 for 57 degrees of freedom
Null hypothesis probability = 7.881E-02
Photon flux (15-150 keV) in 0.9600 sec: 0.783909 ( -0.146932 0.147116 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.2563e-08 ( -1.07591e-08 1.15841e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.544 sec. to 3.504 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98448 ( -2.74870 0.674398 )
Epeak [keV] : 4.24410 ( )
Norm@50keV : 6.003471E-03 ( -2.442490E-03 18.7178 )
------------------------------------------------------------
Chi-Squared = 73.28571 using 59 PHA bins.
but latest trial -0.764222 gives Chi-Squared = 1.96748
Reduced chi-squared = 1.308673 for 56 degrees of freedom
Null hypothesis probability = 6.035E-02
Photon flux (15-150 keV) in 0.9600 sec: 0.783550 ( -0.14688 0.147068 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.24322e-08 ( -1.06455e-08 1.16857e-08 ) ergs/cm2
Band function
Time interval is from 2.544 sec. to 3.504 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.46223 ( -14.9954 4.638672E-03) )
beta : -2.33186 ( -0.627366 0.513092 )
Epeak [keV] : 17.6832 ( -11.2886 5.82553 )
Norm@50keV : 1.766025E-02 ( -3872.22 8.649903E+06) )
------------------------------------------------------------
Chi-Squared = 72.22425 using 59 PHA bins.
Reduced chi-squared = 1.313168 for 55 degrees of freedom
Null hypothesis probability = 5.953E-02
Photon flux (15-150 keV) in 0.9600 sec: 0.784402 ( -0.148232 0.144499 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.86646e-08 ( -9.04982e-09 7.67357e-09 ) ergs/cm2
Plot creation:
Mon Dec 31 16:00:41 EST 2007