batgrbproduct Analysis for Trigger=175653
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): Sat Dec 29 17:41:52 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger175653/GCN5_download_cron
======================================================================
Trigger: 00175653 Segment: 000
BAT Trigger Time: 157953850.048 [s; MET]
Trigger Stop: 157953851.072 [s; MET]
UTC: 2006-01-03T04:04:10.048000 [includes UTCF correction]
WARNING: UTCFINIT is zero. This is suspicious.
Where From?: TDRSS position message
BAT
RA: 105.584413927366 Dec: 62.7752028062787 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 33485
Image Trigger?: NO
Rate S/N Ratio: 14.456832294801 [ if not an image trigger ]
Image S/N Ratio: 33485
Flight Position: [ source = BAT ]
RA: 105.584413927366 Dec: 62.7752028062787 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 105.533060821911 Dec: 62.7607113278207 [deg; J2000]
{ 07h 02m 07.9s , +62d 45' 38.6" }
+/- 3.2588458181985 [arcmin] (estimated 90% radius based on SNR)
+/- 1.85265514158597 [arcmin] (formal 1-sigma fit error)
SNR: 5.6256158761956
RA = 7h 2m 7.9s (105.533061 deg.)
Dec = 62d 45' 39" (62.760711 deg.)
Angular difference between Flight and Ground position is 1.656481 arcmin
Partial Coding Fraction: 0.6640625 [ including projection effects ]
Duration
T90: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
T50: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02399998903275 second)
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.001058 0.000206 0.034879 0.059128
0.007548 0.009317 0.009804 0.011988 [error]
Peak -0.001058 0.000206 0.034879 0.059128
0.007548 0.009317 0.009804 0.011988 [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 2.05e-10 1.87e-09 1.50e-08 7.15e-07 5.76e-08 5.78e-07 erg/cm2
Error 7.78e-10 3.24e-09 1.15e-08 6.54e-07 3.64e-08 0.00e+00 erg/cm2
Peak flux Power-law 6.24e-03 2.93e-02 1.17e-01 1.76e+00 3.48e-01 1.91e+00 ph/cm2/s
Error 2.38e-02 5.29e-02 1.04e-01 1.26e+00 2.80e-01 1.21e+00 ph/cm2/s
Fluence Cutoff-PL 8.63e-11 1.40e-09 1.58e-08 5.44e-07 5.91e-08 1.89e-07 erg/cm2
Error 7.83e-10 3.17e-09 1.03e-08 4.42e-08 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 6.12e-03 2.90e-02 1.18e-01 1.78e+00 3.50e-01 1.93e+00 ph/cm2/s
Error 2.36e-02 5.27e-02 9.45e-02 1.42e+00 2.80e-01 1.36e+00 ph/cm2/s
Fluence Band 1.18e-10 1.71e-09 1.52e-08 6.62e-07 5.88e-08 2.33e-07 erg/cm2
Error 7.72e-10 3.22e-09 1.50e-08 1.39e-06 4.48e-08 0.00e+00 erg/cm2
Peak flux Band 6.20e-03 2.93e-02 1.19e-01 1.73e+00 3.53e-01 1.92e+00 ph/cm2/s
Error 2.36e-02 5.27e-02 1.31e-01 3.69e+00 2.40e-01 3.25e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -1.001 1.195 - - 1.56e-03 2.04e-03 71.698 57
CPL -1.288 6.500 999.1 5000.0 1.89e-03 9.15e-03 71.698 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -1.001 1.195 - - 1.56e-03 2.04e-03 71.698 57
CPL -1.288 6.500 999.1 5000.0 1.89e-03 9.15e-03 71.698 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: 0.896000 sec.
T50 in the 50-300 keV band: 0.448000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
105.5331 +62.7607 0.0342 37.7 -165.0 0.1052 5.6 TRIG_00175653
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-119.048 -46.363 (delta_t = 72.685 [sec])
-45.048 -10.048 (delta_t = 35.000 [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 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.00117 ( -1.13083 1.25918 )
Norm@50keV : 1.560892E-03 ( -1.560892E-03 2.525500E-03) )
------------------------------------------------------------
Chi-Squared = 71.69759 using 59 PHA bins.
Reduced chi-squared = 1.257852 for 57 degrees of freedom
Null hypothesis probability = 9.100E-02
Photon flux (15-150 keV) in 1.024 sec: 0.347958 ( -0.347958 0.212732 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.76399e-08 ( -4.67117e-08 2.61124e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.28821 ( -1.71179 11.2882 )
Epeak [keV] : 999.089 ( -999.079 9000.91 )
Norm@50keV : 1.893238E-03 ( -1.893238E-03 1.640138E-02) )
------------------------------------------------------------
Chi-Squared = 71.69820 using 59 PHA bins.
Reduced chi-squared = 1.280325 for 56 degrees of freedom
Null hypothesis probability = 7.701E-02
Photon flux (15-150 keV) in 1.024 sec: 0.349874 ( -0.349874 0.210643 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.91351e-08 ( -5.91351e-08 2.92332e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 7.387157E-02 ( -10.0739 4.92613 )
beta : 0.998803 ( -1.25694 1.13281 )
Epeak [keV] : 16.6100 ( -16.5100 9983.39 )
Norm@50keV : 2.883561E-03 ( -2.883561E-03 8972.98 )
------------------------------------------------------------
Chi-Squared = 71.69764 using 59 PHA bins.
Reduced chi-squared = 1.303593 for 55 degrees of freedom
Null hypothesis probability = 6.467E-02
Photon flux (15-150 keV) in 1.024 sec: 0.353482 ( -0.273505 0.205837 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.88464e-08 ( -5.88464e-08 3.07846e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.00117 ( -1.13083 1.25918 )
Norm@50keV : 1.560892E-03 ( -1.560892E-03 2.525500E-03) )
------------------------------------------------------------
Chi-Squared = 71.69759 using 59 PHA bins.
Reduced chi-squared = 1.257852 for 57 degrees of freedom
Null hypothesis probability = 9.100E-02
Photon flux (15-150 keV) in 1.024 sec: 0.347958 ( -0.347958 0.212732 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.76399e-08 ( -4.67117e-08 2.61124e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.28821 ( -1.71179 11.2882 )
Epeak [keV] : 999.089 ( -999.079 9000.91 )
Norm@50keV : 1.893238E-03 ( -1.893238E-03 1.640138E-02) )
------------------------------------------------------------
Chi-Squared = 71.69820 using 59 PHA bins.
Reduced chi-squared = 1.280325 for 56 degrees of freedom
Null hypothesis probability = 7.701E-02
Photon flux (15-150 keV) in 1.024 sec: 0.349874 ( -0.349874 0.210643 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.91351e-08 ( -5.91351e-08 2.92332e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 7.387157E-02 ( -10.0739 4.92613 )
beta : 0.998803 ( -1.25694 1.13281 )
Epeak [keV] : 16.6100 ( -16.5100 9983.39 )
Norm@50keV : 2.883561E-03 ( -2.883561E-03 8972.98 )
------------------------------------------------------------
Chi-Squared = 71.69764 using 59 PHA bins.
Reduced chi-squared = 1.303593 for 55 degrees of freedom
Null hypothesis probability = 6.467E-02
Photon flux (15-150 keV) in 1.024 sec: 0.353482 ( -0.273505 0.205837 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.88464e-08 ( -5.88464e-08 3.07846e-08 ) ergs/cm2
Plot creation:
Sat Dec 29 17:56:23 EST 2007