batgrbproduct Analysis for Trigger=143778
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 Jan 7 11:55:53 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger143778/SDC
======================================================================
Trigger: 00143778 Segment: 000
BAT Trigger Time: 141946152 [s; MET]
Trigger Stop: 141946328 [s; MET]
UTC: 2005-07-01T21:29:12.399540 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 268.355718801199 Dec: -1.45077901647868 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.89
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 12.89
Flight Position: [ source = BAT ]
RA: 268.355718801199 Dec: -1.45077901647868 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 268.347550623207 Dec: -1.44038060238041 [deg; J2000]
{ 17h 53m 23.4s , -01d 26' 25.4" }
+/- 1.73763649628572 [arcmin] (estimated 90% radius based on SNR)
+/- 0.7596828752185 [arcmin] (formal 1-sigma fit error)
SNR: 13.8140145477403
RA = 17h 53m 23.4s (268.347551 deg.)
Dec = -1d 26' 25" (-1.440381 deg.)
Angular difference between Flight and Ground position is 0.793280 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 176 +/-
Measured from: 0
to: 176 [s; relative to TRIGTIME]
T50: 176 +/-
Measured from: 0
to: 176 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 176 second)
Measured from: 0
to: 176 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 176 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.673104 0.686223 0.428759 0.126860
0.065465 0.061447 0.053119 0.047410 [error]
Peak 0.673104 0.686223 0.428759 0.126860
0.065465 0.061447 0.053119 0.047410 [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 1.96e-07 2.87e-07 3.14e-07 6.43e-07 9.94e-07 1.44e-06 erg/cm2
Error 3.09e-08 2.84e-08 5.23e-08 2.23e-07 1.18e-07 2.71e-07 erg/cm2
Peak flux Power-law 3.62e-02 2.93e-02 1.60e-02 1.28e-02 8.72e-02 9.42e-02 ph/cm2/s
Error 5.82e-03 2.91e-03 2.56e-03 4.10e-03 8.75e-03 9.36e-03 ph/cm2/s
Fluence Cutoff-PL 1.96e-07 2.88e-07 3.14e-07 6.37e-07 9.94e-07 1.44e-06 erg/cm2
Error 3.09e-08 2.84e-08 5.23e-08 2.21e-07 1.18e-07 2.69e-07 erg/cm2
Peak flux Cutoff-PL 3.62e-02 2.93e-02 1.60e-02 1.27e-02 8.72e-02 9.41e-02 ph/cm2/s
Error 5.82e-03 2.91e-03 2.56e-03 4.08e-03 8.75e-03 9.35e-03 ph/cm2/s
Fluence Band 1.94e-07 2.86e-07 3.14e-07 6.44e-07 9.94e-07 1.45e-06 erg/cm2
Error 6.44e-08 4.20e-07 3.70e-07 2.64e-07 5.92e-07 5.92e-07 erg/cm2
Peak flux Band 3.58e-02 2.92e-02 1.61e-02 1.30e-02 8.71e-02 9.43e-02 ph/cm2/s
Error 5.05e-03 3.05e-03 1.33e-03 4.10e-03 8.62e-03 9.34e-03 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.873 0.199 - - 6.15e-04 7.26e-05 62.413 57
CPL 1.656 0.000 74.1 0.0 8.01e-04 4.42e-04 63.111 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.873 0.199 - - 6.15e-04 7.26e-05 62.413 57
CPL 1.656 0.000 74.1 0.0 8.01e-04 4.42e-04 63.111 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 176.000 0.000 176.000
T90 176.000 0.000 176.000
T50 176.000 0.000 176.000
Peak 176.000 0.000 176.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
268.3476 -1.4404 0.0139 0.1 -156.6 1.9487 13.8 TRIG_00143778
------------------------------------------
Foreground time interval of the image:
0.000 176.000 (delta_t = 176.000 [sec])
Background time interval of the image:
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 176.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87268 ( -0.195497 0.202747 )
Norm@50keV : 6.145783E-04 ( -7.357332E-05 7.170055E-05) )
------------------------------------------------------------
Chi-Squared = 62.41285 using 59 PHA bins.
Reduced chi-squared = 1.094962 for 57 degrees of freedom
Null hypothesis probability = 0.290
Photon flux (15-150 keV) in 176.0 sec: 8.719320E-02 ( -0.00874248 0.00875524 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.94402e-07 ( -1.16598e-07 1.18758e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 176.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65551 ( )
Epeak [keV] : 74.0766 ( )
Norm@50keV : 8.012366E-04 ( -8.986462E-05 7.937380E-04) )
------------------------------------------------------------
Chi-Squared = 63.11093 using 59 PHA bins.
Reduced chi-squared = 1.126981 for 56 degrees of freedom
Null hypothesis probability = 0.240
Photon flux (15-150 keV) in 176.0 sec: 8.715859E-02 ( -0.00873909 0.00875198 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.94344e-07 ( -1.16625e-07 1.18765e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 176.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.48178 ( -8.51822 6.48178 )
beta : -1.87240 ( -0.203925 0.195088 )
Epeak [keV] : 13.3119 ( -13.2119 9986.69 )
Norm@50keV : 1.701043E-03 ( -1.701043E-03 30.5983 )
------------------------------------------------------------
Chi-Squared = 62.41286 using 59 PHA bins.
Reduced chi-squared = 1.134779 for 55 degrees of freedom
Null hypothesis probability = 0.230
Photon flux (15-150 keV) in 176.0 sec: 8.711966E-02 ( -0.00862185 0.00861672 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.94099e-07 ( -1.029e-07 1.0804e-06 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 176.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87268 ( -0.195497 0.202747 )
Norm@50keV : 6.145783E-04 ( -7.357332E-05 7.170055E-05) )
------------------------------------------------------------
Chi-Squared = 62.41285 using 59 PHA bins.
Reduced chi-squared = 1.094962 for 57 degrees of freedom
Null hypothesis probability = 0.290
Photon flux (15-150 keV) in 176.0 sec: 8.719320E-02 ( -0.00874248 0.00875524 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.94402e-07 ( -1.16598e-07 1.18758e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 176.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65551 ( )
Epeak [keV] : 74.0766 ( )
Norm@50keV : 8.012366E-04 ( -8.986462E-05 7.937380E-04) )
------------------------------------------------------------
Chi-Squared = 63.11093 using 59 PHA bins.
Reduced chi-squared = 1.126981 for 56 degrees of freedom
Null hypothesis probability = 0.240
Photon flux (15-150 keV) in 176.0 sec: 8.715859E-02 ( -0.00873909 0.00875198 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.94344e-07 ( -1.16625e-07 1.18765e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 176.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.48178 ( -8.51822 6.48178 )
beta : -1.87240 ( -0.203925 0.195088 )
Epeak [keV] : 13.3119 ( -13.2119 9986.69 )
Norm@50keV : 1.701043E-03 ( -1.701043E-03 30.5983 )
------------------------------------------------------------
Chi-Squared = 62.41286 using 59 PHA bins.
Reduced chi-squared = 1.134779 for 55 degrees of freedom
Null hypothesis probability = 0.230
Photon flux (15-150 keV) in 176.0 sec: 8.711966E-02 ( -0.00862185 0.00861672 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.94099e-07 ( -1.029e-07 1.0804e-06 ) ergs/cm2
Plot creation:
Mon Jan 7 12:14:38 EST 2008