batgrbproduct Analysis for Trigger=152038
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): Tue Jan 8 18:10:13 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger152038/GCN5_download_cron
======================================================================
Trigger: 00152038 Segment: 000
BAT Trigger Time: 146684616.928 [s; MET]
Trigger Stop: 146684617.312 [s; MET]
UTC: 2005-08-25T17:43:37.234320 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 32 ms to TRIGTIME + 320 ms
BAT
RA: 237.315816806457 Dec: 47.3276964837783 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 33400
Image Trigger?: NO
Rate S/N Ratio: 8.36660026534076 [ if not an image trigger ]
Image S/N Ratio: 33400
Flight Position: [ source = BAT ]
RA: 237.315816806457 Dec: 47.3276964837783 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 237.398932331834 Dec: 47.3468810686268 [deg; J2000]
{ 15h 49m 35.7s , +47d 20' 48.8" }
+/- 5.65525643008633 [arcmin] (estimated 90% radius based on SNR)
+/- 2.96119028300365 [arcmin] (formal 1-sigma fit error)
SNR: 2.55968497781484
RA = 15h 49m 35.7s (237.398932 deg.)
Dec = 47d 20' 49" (47.346881 deg.)
Angular difference between Flight and Ground position is 3.570200 arcmin
Partial Coding Fraction: 0.7890625 [ including projection effects ]
Duration
T90: 0.38400000333786 +/-
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
T50: 0.38400000333786 +/-
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.38400000333786 second)
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.003010 -0.000654 0.004381 0.004488
0.003060 0.003145 0.002756 0.002391 [error]
Peak 0.003010 -0.000654 0.004381 0.004488
0.003060 0.003145 0.002756 0.002391 [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 1.47e-10 5.40e-10 1.65e-09 1.60e-08 4.60e-09 1.83e-08 erg/cm2
Error 5.75e-10 9.64e-10 2.02e-09 7.63e-08 5.63e-09 7.73e-08 erg/cm2
Peak flux Power-law 1.20e-02 2.38e-02 3.63e-02 1.21e-01 1.02e-01 1.93e-01 ph/cm2/s
Error 4.90e-02 4.40e-02 4.47e-02 4.75e-01 1.38e-01 4.91e-01 ph/cm2/s
Fluence Cutoff-PL 8.90e-11 7.79e-10 2.48e-09 1.75e-09 4.66e-09 5.03e-09 erg/cm2
Error 5.10e-10 1.20e-09 2.76e-09 1.10e-07 5.55e-09 8.60e-08 erg/cm2
Peak flux Cutoff-PL 6.97e-03 3.30e-02 5.63e-02 2.15e-02 1.13e-01 1.17e-01 ph/cm2/s
Error 4.33e-02 5.27e-02 6.26e-02 6.55e-01 1.30e-01 4.92e-01 ph/cm2/s
Fluence Band 4.62e-11 7.67e-10 2.81e-09 1.51e-09 4.65e-09 4.72e-09 erg/cm2
Error 2.04e-10 1.17e-09 3.00e-09 4.13e-08 5.53e-09 4.58e-08 erg/cm2
Peak flux Band 4.30e-03 2.51e-02 6.37e-02 2.73e-02 1.11e-01 1.15e-01 ph/cm2/s
Error 5.11e-02 6.85e-02 4.10e-01 1.24e-01 4.45e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.391 6.500 - - 8.45e-04 1.19e-03 41.313 57
CPL -2.500 0.000 95.4 5000.0 1.44e-02 5.00e+23 40.809 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.391 6.500 - - 8.45e-04 1.19e-03 41.313 57
CPL -2.500 0.000 95.4 5000.0 1.44e-02 5.00e+23 40.809 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.384 0.000 0.384
T90 0.384 0.000 0.384
T50 0.384 0.000 0.384
Peak 0.384 0.000 0.384
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
237.3989 +47.3469 0.0748 18.3 -98.4 0.0156 2.6 TRIG_00152038
------------------------------------------
Foreground time interval of the image:
-0.032 0.352 (delta_t = 0.384 [sec])
Background time interval of the image:
-59.960 -0.960 (delta_t = 59.000 [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 -0.032 sec. to 0.352 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.391154 ( -3.39115 9.60885 )
Norm@50keV : 8.448858E-04 ( -8.448858E-04 1.533612E-03) )
------------------------------------------------------------
Chi-Squared = 41.31261 using 59 PHA bins.
Reduced chi-squared = 0.7247826 for 57 degrees of freedom
Null hypothesis probability = 0.941
Photon flux (15-150 keV) in 0.3840 sec: 0.101678 ( -0.101678 0.175272 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.59717e-09 ( -4.59717e-09 6.66939e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49990 ( )
Epeak [keV] : 95.4108 ( -83.6487 9916.34 )
Norm@50keV : 1.439428E-02 ( -2.893743E-02 1.000000E+24) )
------------------------------------------------------------
Chi-Squared = 40.80933 using 59 PHA bins.
Reduced chi-squared = 0.7287380 for 56 degrees of freedom
Null hypothesis probability = 0.936
Photon flux (15-150 keV) in 0.3840 sec: 0.113321 ( -0.113321 0.147502 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.66268e-09 ( -4.66268e-09 6.43484e-09 ) ergs/cm2
Band function
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.693847 ( -9.30615 5.69385 )
beta : -0.437549 ( -6.06051 13.9395 )
Epeak [keV] : 30.9016 ( -79.4432 9920.46 )
Norm@50keV : 1.081119E-03 ( -8.276272E-02 32.7865 )
------------------------------------------------------------
Chi-Squared = 41.31417 using 59 PHA bins.
Reduced chi-squared = 0.7511668 for 55 degrees of freedom
Null hypothesis probability = 0.914
Photon flux (15-150 keV) in 0.3840 sec: 0.110691 ( -0.110691 0.13807 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.64529e-09 ( -4.64529e-09 6.41718e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.391154 ( -3.39115 9.60885 )
Norm@50keV : 8.448858E-04 ( -8.448858E-04 1.533612E-03) )
------------------------------------------------------------
Chi-Squared = 41.31261 using 59 PHA bins.
Reduced chi-squared = 0.7247826 for 57 degrees of freedom
Null hypothesis probability = 0.941
Photon flux (15-150 keV) in 0.3840 sec: 0.101678 ( -0.101678 0.175272 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.59717e-09 ( -4.59717e-09 6.66939e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49990 ( )
Epeak [keV] : 95.4108 ( -83.6487 9916.34 )
Norm@50keV : 1.439428E-02 ( -2.893743E-02 1.000000E+24) )
------------------------------------------------------------
Chi-Squared = 40.80933 using 59 PHA bins.
Reduced chi-squared = 0.7287380 for 56 degrees of freedom
Null hypothesis probability = 0.936
Photon flux (15-150 keV) in 0.3840 sec: 0.113321 ( -0.113321 0.147502 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.66268e-09 ( -4.66268e-09 6.43484e-09 ) ergs/cm2
Band function
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.693847 ( -9.30615 5.69385 )
beta : -0.437549 ( -6.06051 13.9395 )
Epeak [keV] : 30.9016 ( -79.4432 9920.46 )
Norm@50keV : 1.081119E-03 ( -8.276272E-02 32.7865 )
------------------------------------------------------------
Chi-Squared = 41.31417 using 59 PHA bins.
Reduced chi-squared = 0.7511668 for 55 degrees of freedom
Null hypothesis probability = 0.914
Photon flux (15-150 keV) in 0.3840 sec: 0.110691 ( -0.110691 0.13807 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.64529e-09 ( -4.64529e-09 6.41718e-09 ) ergs/cm2
Plot creation:
Tue Jan 8 18:16:46 EST 2008