batgrbproduct Analysis for Trigger=315630
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 Jul 1 23:25:25 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger315630/GCN5_download_cron
======================================================================
Trigger: 00315630 Segment: 000
BAT Trigger Time: 236609408.064 [s; MET]
Trigger Stop: 236609408.32 [s; MET]
UTC: 2008-07-01T12:50:05.156340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 35.5704321007523 Dec: 39.8289431960506 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.54
Image Trigger?: NO
Rate S/N Ratio: 6.16441400296898 [ if not an image trigger ]
Image S/N Ratio: 6.54
Flight Position: [ source = BAT ]
RA: 35.5704321007523 Dec: 39.8289431960506 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 35.5547027401129 Dec: 39.8176177195545 [deg; J2000]
{ 02h 22m 13.1s , +39d 49' 03.4" }
+/- 3.02474272766504 [arcmin] (estimated 90% radius based on SNR)
+/- 1.75875413348537 [arcmin] (formal 1-sigma fit error)
SNR: 6.25778455148836
Angular difference between Flight and Ground position is 0.993549 arcmin
Partial Coding Fraction: 0.6796875 [ including projection effects ]
Duration
T90: 0.0679999887943268 +/- 0.0252982160037338
Measured from: 0.104000002145767
to: 0.171999990940094 [s; relative to TRIGTIME]
T50: 0.0399999916553497 +/- 0.0226273996334777
Measured from: 0.127999991178513
to: 0.167999982833862 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.358000010251999
to: 0.641999989748001 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.104000002145767
to: 0.175999999046326 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.004755 0.009259 0.003631 0.002911
0.001791 0.001968 0.001708 0.001602 [error]
Peak 0.004979 0.009540 0.003383 0.002917
0.001829 0.002032 0.001758 0.001622 [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-09 7.68e-10 2.48e-10 1.03e-10 2.54e-09 2.62e-09 erg/cm2
Error 7.72e-10 3.59e-10 1.43e-10 8.55e-11 1.21e-09 1.23e-09 erg/cm2
Peak flux Power-law 7.14e-01 2.06e-01 3.23e-02 5.78e-03 9.56e-01 9.58e-01 ph/cm2/s
Error 3.59e-01 9.28e-02 1.81e-02 5.38e-03 4.54e-01 4.55e-01 ph/cm2/s
Fluence Cutoff-PL 1.31e-09 4.06e-09 2.05e-09 6.61e-11 7.51e-09 7.43e-09 erg/cm2
Error 5.64e-10 1.18e-09 8.10e-10 5.49e-11 2.13e-09 2.14e-09 erg/cm2
Peak flux Cutoff-PL 7.14e-01 2.06e-01 3.23e-02 5.77e-03 9.57e-01 9.58e-01 ph/cm2/s
Error 3.59e-01 9.29e-02 1.82e-02 5.37e-03 4.54e-01 4.54e-01 ph/cm2/s
Fluence Band 9.30e-10 4.26e-09 2.30e-09 5.88e-11 7.60e-09 7.71e-09 erg/cm2
Error 6.97e-10 1.22e-09 1.13e-09 5.72e-11 2.18e-09 2.19e-09 erg/cm2
Peak flux Band 3.95e-01 1.01e+00 3.01e-01 3.93e-03 1.72e+00 1.72e+00 ph/cm2/s
Error 2.49e-01 2.90e-01 2.23e-01 3.90e-03 5.27e-01 5.57e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.629 0.532 - - 2.07e-03 1.07e-03 78.284 57
CPL -2.499 0.000 41.1 4.7 4.94e+00 5.59e+00 57.314 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.675 0.525 - - 2.05e-03 1.04e-03 78.372 57
CPL -2.494 0.000 40.6 4.9 4.98e+00 5.79e+00 58.359 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 0.072 0.104 0.176
T90 0.068 0.104 0.172
T50 0.040 0.128 0.168
Peak 1.000 -0.358 0.642
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
35.5547 +39.8176 0.0307 36.0 -15.1 0.0209 6.3 TRIG_00315630
------------------------------------------
Foreground time interval of the image:
0.104 0.176 (delta_t = 0.072 [sec])
Background time interval of the image:
-239.064 -65.964 (delta_t = 173.100 [sec])
-65.064 0.104 (delta_t = 65.168 [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 0.104 sec. to 0.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.62868 ( -0.449656 0.613598 )
Norm@50keV : 2.070544E-03 ( -1.094675E-03 1.045403E-03) )
------------------------------------------------------------
Chi-Squared = 78.28392 using 59 PHA bins.
Reduced chi-squared = 1.373402 for 57 degrees of freedom
Null hypothesis probability = 3.222E-02
Photon flux (15-150 keV) in 7.2000E-02 sec: 0.930660 ( -0.462746 0.46392 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.54393e-09 ( -1.21242e-09 1.21052e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.104 sec. to 0.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49946 ( )
Epeak [keV] : 41.0620 ( -5.68449 3.80251 )
Norm@50keV : 4.93525 ( -3.56075 7.62179 )
------------------------------------------------------------
Chi-Squared = 57.31365 using 59 PHA bins.
Reduced chi-squared = 1.023458 for 56 degrees of freedom
Null hypothesis probability = 0.426
Photon flux (15-150 keV) in 7.2000E-02 sec: 1.84028 ( -0.54175 0.5424 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.51046e-09 ( -2.1561e-09 2.1127e-09 ) ergs/cm2
Band function
Time interval is from 0.104 sec. to 0.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.581149 ( -1.70823 2.24848 )
beta : -9.36776 ( -6.771088E-05 19.9997 )
Epeak [keV] : 22.7255 ( -7.87914 5.78340 )
Norm@50keV : 0.183373 ( -12.4025 36.1071 )
------------------------------------------------------------
Chi-Squared = 66.29649 using 59 PHA bins.
Reduced chi-squared = 1.205391 for 55 degrees of freedom
Null hypothesis probability = 0.141
Photon flux (15-150 keV) in 7.2000E-02 sec: 1.78743 ( -0.52957 0.53188 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.59838e-09 ( -2.20495e-09 2.16396e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.104 sec. to 0.180 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.67520 ( -0.435495 0.614357 )
Norm@50keV : 2.046282E-03 ( -1.068504E-03 1.011291E-03) )
------------------------------------------------------------
Chi-Squared = 78.37216 using 59 PHA bins.
Reduced chi-squared = 1.374950 for 57 degrees of freedom
Null hypothesis probability = 3.174E-02
Photon flux (15-150 keV) in 7.6000E-02 sec: 0.956081 ( -0.453971 0.454589 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.73506e-09 ( -1.24759e-09 1.24634e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.104 sec. to 0.180 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49389 ( )
Epeak [keV] : 40.6373 ( -5.89715 3.84509 )
Norm@50keV : 4.97523 ( -3.56796 8.01547 )
------------------------------------------------------------
Chi-Squared = 58.35868 using 59 PHA bins.
Reduced chi-squared = 1.042119 for 56 degrees of freedom
Null hypothesis probability = 0.389
Photon flux (15-150 keV) in 7.6000E-02 sec: 0.956648 ( -0.453909 0.454532 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.65138e-09 ( -2.17795e-09 2.17945e-09 ) ergs/cm2
Band function
Time interval is from 0.104 sec. to 0.180 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.584336 ( -0.595088 3.24473 )
beta : -8.90801 ( -6.275177E-04 19.9974 )
Epeak [keV] : 21.9976 ( -8.27044 5.80909 )
Norm@50keV : 0.189191 ( -11.3396 37.4618 )
------------------------------------------------------------
Chi-Squared = 67.04644 using 59 PHA bins.
Reduced chi-squared = 1.219026 for 55 degrees of freedom
Null hypothesis probability = 0.128
Photon flux (15-150 keV) in 7.6000E-02 sec: 1.72292 ( -0.50694 0.54697 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.72358e-09 ( -2.22008e-09 2.2176e-09 ) ergs/cm2
Plot creation:
Wed Jul 2 00:08:06 EDT 2008