batgrbproduct Analysis for Trigger=149131
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 15:31:28 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger149131/SDC
======================================================================
Trigger: 00149131 Segment: 000
BAT Trigger Time: 144967286.412 [s; MET]
Trigger Stop: 144967286.444 [s; MET]
UTC: 2005-08-05T20:41:26.752760 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 306.004513209698 Dec: 37.2127175321715 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.3
Image Trigger?: NO
Rate S/N Ratio: 9.05538513813742 [ if not an image trigger ]
Image S/N Ratio: 6.3
Flight Position: [ source = BAT ]
RA: 306.004513209698 Dec: 37.2127175321715 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 305.972400456123 Dec: 37.1511526374572 [deg; J2000]
{ 20h 23m 53.4s , +37d 09' 04.1" }
+/- 4.52942669790765 [arcmin] (estimated 90% radius based on SNR)
+/- 2.93493327871164 [arcmin] (formal 1-sigma fit error)
SNR: 3.51490634465222
RA = 20h 23m 53.4s (305.972400 deg.)
Dec = 37d 9' 4" (37.151153 deg.)
Angular difference between Flight and Ground position is 4.000170 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 0.0320000052452087 +/-
Measured from: 0
to: 0.0320000052452087 [s; relative to TRIGTIME]
T50: 0.0320000052452087 +/-
Measured from: 0
to: 0.0320000052452087 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.0320000052452087 second)
Measured from: 0
to: 0.0320000052452087 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0320000052452087 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.001741 -0.000511 0.003448 0.003890
0.000867 0.000794 0.000936 0.000919 [error]
Peak -0.001741 -0.000511 0.003448 0.003890
0.000867 0.000794 0.000936 0.000919 [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 2.24e-11 1.09e-10 4.52e-10 7.30e-09 1.35e-09 7.96e-09 erg/cm2
Error 7.42e-11 1.81e-10 4.93e-10 1.54e-08 1.43e-09 1.55e-08 erg/cm2
Peak flux Power-law 3.40e-05 5.55e-02 1.17e-01 6.26e-01 3.15e-01 4.19e-01 ph/cm2/s
Error 9.72e-02 1.29e-01 1.15e+00 3.60e-01 1.32e+00 0.00e+00 ph/cm2/s
Fluence Cutoff-PL 1.07e-11 1.29e-10 7.51e-10 1.72e-09 1.75e-09 2.24e-09 erg/cm2
Error 2.23e-11 1.81e-10 7.07e-10 1.12e-08 1.57e-09 8.81e-09 erg/cm2
Peak flux Cutoff-PL 2.14e-02 5.58e-02 1.17e-01 2.45e-01 4.00e-01 8.19e-01 ph/cm2/s
Error 7.41e-02 9.90e-02 8.55e-01 3.53e-01 1.23e+00 0.00e+00 ph/cm2/s
Fluence Band 4.67e-16 1.07e-14 1.06e-08 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 1.29e-14 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 6.42e-03 4.92e-02 2.14e-01 2.07e-01 4.12e-01 6.09e-02 ph/cm2/s
Error 1.71e-02 6.47e-02 1.83e-01 7.53e-01 3.76e-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 -0.051 6.500 - - 2.30e-03 3.06e-03 76.305 57
CPL -0.089 6.500 9998.7 0.0 2.30e-03 5.00e+23 76.293 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.051 6.500 - - 2.30e-03 3.06e-03 76.305 57
CPL -0.089 6.500 9998.7 0.0 2.30e-03 5.00e+23 76.293 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 0.032 0.000 0.032
T90 0.032 0.000 0.032
T50 0.032 0.000 0.032
Peak 0.032 0.000 0.032
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
305.9724 +37.1512 0.0546 22.1 -173.7 0.0061 3.5 TRIG_00149131
------------------------------------------
Foreground time interval of the image:
0.012 0.044 (delta_t = 0.032 [sec])
Background time interval of the image:
-168.995 -6.400 (delta_t = 162.595 [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 0.012 sec. to 0.044 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -5.060085E-02 ( -2.94940 10.0506 )
Norm@50keV : 2.304711E-03 ( -2.304711E-03 3.821058E-03) )
------------------------------------------------------------
Chi-Squared = 76.30510 using 59 PHA bins.
Reduced chi-squared = 1.338686 for 57 degrees of freedom
Null hypothesis probability = 4.479E-02
Photon flux (15-150 keV) in 3.2000E-02 sec: 0.314968 ( -0.314968 0.406016 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.35274e-09 ( -1.35274e-09 1.49775e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.012 sec. to 0.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -8.904867E-02 ( -2.91095 10.0890 )
Epeak [keV] : 9998.67 ( )
Norm@50keV : 2.295943E-03 ( -2.669595E-03 1.000000E+24) )
------------------------------------------------------------
Chi-Squared = 76.29292 using 59 PHA bins.
Reduced chi-squared = 1.362373 for 56 degrees of freedom
Null hypothesis probability = 3.701E-02
Photon flux (15-150 keV) in 3.2000E-02 sec: 0.399865 ( -0.351562 0.353797 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.7496e-09 ( -1.54154e-09 1.60285e-09 ) ergs/cm2
Band function
Time interval is from 0.012 sec. to 0.044 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.38508 ( -14.9148 1.237726E-02) )
beta : -9.36937 ( -0.635756 19.3642 )
Epeak [keV] : 125.418 ( -101.304 131.376 )
Norm@50keV : 3.434917E-02 ( -6.964669E-02 124581. )
------------------------------------------------------------
Chi-Squared = 74.57834 using 59 PHA bins.
Reduced chi-squared = 1.355970 for 55 degrees of freedom
Null hypothesis probability = 4.057E-02
Photon flux (15-150 keV) in 3.2000E-02 sec: 0.411963 ( -0.411963 0.33954 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.012 sec. to 0.044 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -5.060085E-02 ( -2.94940 10.0506 )
Norm@50keV : 2.304711E-03 ( -2.304711E-03 3.821058E-03) )
------------------------------------------------------------
Chi-Squared = 76.30510 using 59 PHA bins.
Reduced chi-squared = 1.338686 for 57 degrees of freedom
Null hypothesis probability = 4.479E-02
Photon flux (15-150 keV) in 3.2000E-02 sec: 0.314968 ( -0.314968 0.406016 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.35274e-09 ( -1.35274e-09 1.49775e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.012 sec. to 0.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -8.904867E-02 ( -2.91095 10.0890 )
Epeak [keV] : 9998.67 ( )
Norm@50keV : 2.295943E-03 ( -2.669595E-03 1.000000E+24) )
------------------------------------------------------------
Chi-Squared = 76.29292 using 59 PHA bins.
Reduced chi-squared = 1.362373 for 56 degrees of freedom
Null hypothesis probability = 3.701E-02
Photon flux (15-150 keV) in 3.2000E-02 sec: 0.399865 ( -0.351562 0.353797 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.7496e-09 ( -1.54154e-09 1.60285e-09 ) ergs/cm2
Band function
Time interval is from 0.012 sec. to 0.044 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.38508 ( -14.9157 1.230574E-02) )
beta : -9.36937 ( -0.637123 19.3629 )
Epeak [keV] : 125.418 ( -113.995 131.552 )
Norm@50keV : 3.434917E-02 ( -6.394756E-02 34260.9 )
------------------------------------------------------------
Chi-Squared = 74.57834 using 59 PHA bins.
Reduced chi-squared = 1.355970 for 55 degrees of freedom
Null hypothesis probability = 4.057E-02
Photon flux (15-150 keV) in 3.2000E-02 sec: 0.411963 ( -0.411963 0.33954 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Tue Jan 8 15:57:39 EST 2008