batgrbproduct analysis for trigger=1297508
batgrbproduct Analysis for Trigger=1297508
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 batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 15 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.48
Process Start Time (local time): Sat Mar 22 01:04:20 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1297508/GCN5_download_cron
======================================================================
Trigger: 01297508 Segment: 000
BAT Trigger Time: 764210594.176 [s; MET]
Trigger Stop: 764210595.2 [s; MET]
UTC: 2025-03-21T00:42:38.895220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 295.077345921574 Dec: 21.0409425585755 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.33
Image Trigger?: NO
Rate S/N Ratio: 21.9772609758359 [ if not an image trigger ]
Image S/N Ratio: 10.33
Flight Position: [ source = BAT ]
RA: 295.077345921574 Dec: 21.0409425585755 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 295.099583313661 Dec: 21.0545514959853 [deg; J2000]
{ 19h 40m 23.9s , +21d 03' 16.4" }
+/- 1.81450911812801 [arcmin] (estimated 90% radius based on SNR)
+/- 1.07967862438939 [arcmin] (formal 1-sigma fit error)
SNR: 12.9856126587536
Angular difference between Flight and Ground position is 1.489066 arcmin
Partial Coding Fraction: 0.2460938 [ including projection effects ]
Duration
T90: 6.20799994468689 +/- 1.35764500639118
Measured from: -0.00799989700317383
to: 6.20000004768372 [s; relative to TRIGTIME]
T50: 2.62399983406067 +/- 1.05551506860802
Measured from: 0.440000176429749
to: 3.06400001049042 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.156000018119812
to: 0.843999981880188 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.136000037193298
to: 7.35199999809265 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.232761 0.411639 0.295585 0.048182
0.039599 0.042230 0.035662 0.026896 [error]
Peak 0.066221 0.145861 0.123729 0.016809
0.015331 0.018476 0.016758 0.011513 [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 1.01e-07 1.74e-07 2.29e-07 6.10e-07 6.70e-07 1.11e-06 erg/cm2
Error 1.92e-08 2.12e-08 3.40e-08 1.86e-07 8.39e-08 2.15e-07 erg/cm2
Peak flux Power-law 9.05e-01 1.02e+00 8.25e-01 1.11e+00 3.16e+00 3.86e+00 ph/cm2/s
Error 2.27e-01 1.64e-01 1.28e-01 3.44e-01 4.57e-01 5.42e-01 ph/cm2/s
Fluence Cutoff-PL 8.87e-08 1.91e-07 2.44e-07 2.24e-07 6.45e-07 7.48e-07 erg/cm2
Error 2.24e-08 2.72e-08 3.94e-08 2.38e-07 8.83e-08 2.48e-07 erg/cm2
Peak flux Cutoff-PL 7.96e-01 1.08e+00 8.94e-01 6.37e-01 3.12e+00 3.41e+00 ph/cm2/s
Error 2.71e-01 1.93e-01 1.65e-01 5.83e-01 4.61e-01 7.16e-01 ph/cm2/s
Fluence Band 8.49e-08 1.98e-07 2.31e-07 4.06e-07 6.48e-07 9.19e-07 erg/cm2
Error 2.43e-08 3.17e-08 4.55e-08 -------- -------- -------- erg/cm2
Peak flux Band 8.51e-01 1.13e+00 9.13e-01 6.36e-01 3.24e+00 3.54e+00 ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.608 0.188 - - 9.58e-03 1.14e-03 54.530 57
CPL 0.783 0.853 74.5 125.2 2.50e-02 3.14e-02 51.140 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.308 0.220 - - 2.64e-02 3.66e-03 58.260 57
CPL 0.694 0.916 116.4 -35.6 5.19e-02 7.35e-02 56.950 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: 2.496000 sec.
T50 in the 50-300 keV band: 1.536000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 7.488 -0.136 7.352
T90 6.208 -0.008 6.200
T50 2.624 0.440 3.064
Peak 1.000 -0.156 0.844
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
295.0996 +21.0546 0.0147 44.3 21.9 1.0380 13.0 TRIG_01297508
------------------------------------------
Foreground time interval of the image:
-0.136 7.352 (delta_t = 7.488 [sec])
Background time interval of the image:
-239.176 -0.136 (delta_t = 239.040 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) 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.
- 5) 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.
- 6) 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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.136 sec. to 7.352 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60768 ( -0.186321 0.189334 )
Norm@50keV : 9.58165E-03 ( -0.00113935 0.00113422 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.53 using 59 PHA bins.
# Reduced chi-squared = 0.9567 for 57 degrees of freedom
# Null hypothesis probability = 5.681210e-01
Photon flux (15-150 keV) in 7.488 sec: 1.23423 ( -0.148581 0.148965 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.70373e-07 ( -8.36402e-08 8.40962e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.136 sec. to 7.352 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.783370 ( -0.937008 0.768696 )
Epeak [keV] : 74.4806 ( -18.5255 231.917 )
Norm@50keV : 2.50320E-02 ( -0.0145894 0.0481466 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.14 using 59 PHA bins.
# Reduced chi-squared = 0.9133 for 56 degrees of freedom
# Null hypothesis probability = 6.588989e-01
Photon flux (15-150 keV) in 7.488 sec: 1.20277 ( -0.15159 0.15188 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.45269e-07 ( -8.8291e-08 8.83696e-08 ) ergs/cm2
Band function
Time interval is from -0.136 sec. to 7.352 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.69524 ( -4.56644 -3.29653 )
beta : -1.83736 ( 1.83254 0.273328 )
Epeak [keV] : 33.0833 ( -9.40561 158.446 )
Norm@50keV : 7.28739 ( -7.28627 143.662 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.02 using 59 PHA bins.
# Reduced chi-squared = 0.9276 for 55 degrees of freedom
# Null hypothesis probability = 6.274195e-01
Photon flux (15-150 keV) in 7.488 sec: 1.20938 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.48155e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.3728 (-1.82759 2.12393)
R^2/D10^2 : 0.166037 (-0.0659573 0.106064)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.25 using 59 PHA bins.
# Reduced chi-squared = 1.110 for 57 degrees of freedom
# Null hypothesis probability = 2.653999e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.410e-08 1.118e-08
25- 50 2.065e-07 3.519e-08
50-150 2.845e-07 5.530e-08
15-150 5.451e-07 8.622e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 165.137 (-62.6168 -165.135)
Norm : 5.12848 (-0.650925 0.759802)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.776e-08 3.056e-08
25- 50 1.836e-07 9.469e-08
50-150 3.766e-07 2.097e-07
15-150 6.580e-07 3.515e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.02043 (-2.98009 3.2809)
R1^2/D10^2 : 0.823498 (-0.263518 2.83104)
kT2 [keV] : 25.0881 (-7.6428 26.7103)
R2^2/D10^2 : 1.54442E-02 (-0.0140072 0.054191)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.449e-08 4.680e-08
25- 50 1.981e-07 1.052e-07
50-150 3.681e-07 2.043e-07
15-150 6.506e-07 3.083e-07
Peak spectrum fit
Power-law model
Time interval is from -0.156 sec. to 0.844 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30782 ( -0.220977 0.218873 )
Norm@50keV : 2.64203E-02 ( -0.00365584 0.00365552 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.26 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 57 degrees of freedom
# Null hypothesis probability = 4.286760e-01
Photon flux (15-150 keV) in 1 sec: 3.15660 ( -0.456857 0.458069 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.60586e-07 ( -3.82583e-08 3.83765e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.156 sec. to 0.844 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.694089 ( -1.11387 0.718996 )
Epeak [keV] : 116.404 ( -45.163 -116.401 )
Norm@50keV : 5.18638E-02 ( -0.0279394 0.118987 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.95 using 59 PHA bins.
# Reduced chi-squared = 1.017 for 56 degrees of freedom
# Null hypothesis probability = 4.395066e-01
Photon flux (15-150 keV) in 1 sec: 3.11781 ( -0.46021 0.46153 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.56549e-07 ( -4.0006e-08 3.9504e-08 ) ergs/cm2
Band function
Time interval is from -0.156 sec. to 0.844 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -5.95850E-02 ( -0.076429 -0.076429 )
beta : -1.61221 ( 1.66049 0.464858 )
Epeak [keV] : 69.0968 ( -65.8132 195.313 )
Norm@50keV : 0.122901 ( -0.165016 274.125 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.12 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 55 degrees of freedom
# Null hypothesis probability = 4.326264e-01
Photon flux (15-150 keV) in 1 sec: 3.24383 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.55571e-07 ( -2.55564e-07 -3.9229e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.4823 (-2.6581 3.3068)
R^2/D10^2 : 0.233555 (-0.106091 0.179003)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.442e-08 3.954e-09
25- 50 6.523e-08 1.403e-08
50-150 1.436e-07 3.635e-08
15-150 2.232e-07 4.395e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-48.1123 -200)
Norm : 13.3064 (-1.86038 1.86038)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.314e-08 1.880e-08
25- 50 6.374e-08 3.573e-08
50-150 1.398e-07 7.750e-08
15-150 2.367e-07 1.312e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.3048 (-4.8328 4.0515)
R1^2/D10^2 : 0.731846 (-0.413685 2.33074)
kT2 [keV] : 45.4667 (-25.2552 -47.7254)
R2^2/D10^2 : 6.56102E-03 (-0.00529592 0.0757956)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.123e-08 1.231e-08
25- 50 6.874e-08 3.801e-08
50-150 1.670e-07 8.390e-08
15-150 2.570e-07 1.293e-07
Plot creation:
Sat Mar 22 01:08:14 EDT 2025