Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done using the HEASARC data.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.48
Process Start Time: Thu Jun 19 21:07:40 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1299088
======================================================================
Trigger: 01299088 Segment: 000
BAT Trigger Time: 764753440 [s; MET]
Trigger Stop: 764753528 [s; MET]
UTC: 2025-03-27T07:30:04.682040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 248.197231340375 Dec: 61.5954132033376 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.75
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.75
Analysis Position: [ source = BAT ]
RA: 248.197231340375 Dec: 61.5954132033376 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 248.210266476575 Dec: 61.6110574920648 [deg; J2000]
{ 16h 32m 50.5s , +61d 36' 39.8" }
+/- 2.24512996958931 [arcmin] (estimated 90% radius based on SNR)
+/- 1.21817189831926 [arcmin] (formal 1-sigma fit error)
SNR: 9.57954378680222
Angular difference between the analysis and refined position is 1.009666 arcmin
Partial Coding Fraction: 0.1035156 [ including projection effects ]
Duration
T90: 91.0080000162125 +/- 12.6049538740041
Measured from: 3.75199997425079
to: 94.7599999904633 [s; relative to TRIGTIME]
T50: 34.6240000724792 +/- 9.41458278576535
Measured from: 18.5360000133514
to: 53.1600000858307 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 24.4919999837875
to: 25.4919999837875 [s; relative to TRIGTIME]
Total Fluence
Measured from: 1.67200005054474
to: 109.927999973297 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.027111 3.525925 3.355896 1.375175
0.252841 0.232197 0.203890 0.169297 [error]
Peak 0.041381 0.106692 0.112077 0.055024
0.025567 0.026820 0.024378 0.017861 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 108.256 1.672 109.928
T90 91.008 3.752 94.760
T50 34.624 18.536 53.160
Peak 1.000 24.492 25.492
====== Spectral Analysis Summary =====================================
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^{Ph_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 both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedo
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.289 -0.122 0.124 - - - 7.12e-03 -4.84e-04 4.81e-04 60.190 57
CPL -1.244 -0.167 0.328 977.412 -977.412 -977.412 7.46e-03 -7.82e-04 2.44e-03 60.400 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -2.193 -0.491 0.399 - - - 1.27e-02 -4.72e-03 4.65e-03 64.000 57
CPL 1.210 -2.111 3.921 61.680 -16.728 14.321 3.49e-01 -3.49e-01 5.49e+00 55.600 56
=== 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 PL 8.08e-07 1.69e-06 2.77e-06 1.02e-05 7.64e-06 1.55e-05 erg/cm2
90%_error_low -1.15e-07 -1.47e-07 -1.98e-07 -1.63e-06 -5.09e-07 -1.71e-06 erg/cm2
90%_error_hi 1.23e-07 1.46e-07 1.97e-07 1.83e-06 5.10e-07 1.87e-06 erg/cm2
Peak flux PL 1.02e+00 6.87e-01 3.01e-01 1.82e-01 2.10e+00 2.19e+00 ph/cm2/s
90%_error_low -4.30e-01 -2.38e-01 -1.29e-01 -1.11e-01 -7.43e-01 -7.54e-01 ph/cm2/s
90%_error_hi 4.74e-01 2.37e-01 1.27e-01 1.42e-01 7.51e-01 7.67e-01 ph/cm2/s
Fluence CPL 8.07e-07 1.68e-06 2.73e-06 1.06e-05 7.64e-06 1.56e-05 erg/cm2
90%_error_low -1.16e-07 -1.38e-07 -1.58e-07 -1.09e-06 -5.09e-07 -3.62e-06 erg/cm2
90%_error_hi 1.22e-07 1.54e-07 2.55e-07 1.39e-06 5.10e-07 1.79e-06 erg/cm2
Peak flux CPL 4.02e-01 8.62e-01 6.37e-01 1.07e-01 1.99e+00 2.01e+00 ph/cm2/s
90%_error_low -4.02e-01 -4.09e-01 -2.62e-01 -1.07e-01 -7.06e-01 -7.05e-01 ph/cm2/s
90%_error_hi 5.53e-01 3.24e-01 2.94e-01 9.93e-02 7.43e-01 7.48e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 248.2103 61.6111 0.0198 50.6481 -143.7733 11.3504775 9.580 TRIG_01299088 Foreground time interval of the image: 1.672 109.928 (delta_t = 108.256 [sec]) Background time interval of the image: -17.499 1.672 (delta_t = 19.171 [sec])
Light Curves
Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.
Full-time range; 1 s binning
Other quick-look light curves:
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using 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 average DRM
Power-law model
Time interval is from 1.672 sec. to 109.928 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.28852 ( -0.122012 0.123997 ) Norm@50keV : 7.12160E-03 ( -0.000483912 0.000481461 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 60.19 using 59 bins. Reduced chi-squared = 1.05596 # Null hypothesis probability of 3.61e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 108.3 sec: 0.847863 ( -0.064567 0.06511 ) ph/cm2/s Energy fluence (15-150 keV) : 7.64397e-06 ( -5.09057e-07 5.09804e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.672 sec. to 109.928 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.28421 ( -0.167 0.327984 ) Epeak [keV] : 9999.35 ( -9999.35 -9999.35 ) Norm@50keV : 7.15190E-03 ( -0.000477502 0.00274007 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 60.21 using 59 bins. Reduced chi-squared = 1.07518 # Null hypothesis probability of 3.26e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 108.3 sec: 0.847607 ( -0.064536 0.065149 ) ph/cm2/s Energy fluence (15-150 keV) : 7.64273e-06 ( -5.09465e-07 5.09725e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 24.492 sec. to 25.492 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.19259 ( -0.496851 0.392449 ) Norm@50keV : 1.27440E-02 ( -0.00473318 0.00464407 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 64.00 using 59 bins. Reduced chi-squared = 1.12281 # Null hypothesis probability of 2.44e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 2.09981 ( -0.7433 0.75066 ) ph/cm2/s Energy fluence (15-150 keV) : 1.19795e-07 ( -4.18999e-08 4.20428e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 24.492 sec. to 25.492 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.2103 ( -2.10921 3.92253 ) Epeak [keV] : 61.6796 ( -16.7419 14.3066 ) Norm@50keV : 0.348611 ( -0.348318 5.48829 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 55.60 using 59 bins. Reduced chi-squared = 0.992857 # Null hypothesis probability of 4.90e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.99183 ( -0.70555 0.7431 ) ph/cm2/s Energy fluence (15-150 keV) : 1.50439e-07 ( -4.57117e-08 4.55583e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 91.008 sec. Hardness ratio (energy fluence ratio) = 1.63753278154
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.4984075e-06 S(50-150 keV) = 5.145613e-06
The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.
Mask shadow pattern
IMX = -9.837567573317278E-01, IMY = 7.207048505493830E-01
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image: -17.499400 1.672000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9705 -15.6425 0.4 29.8 5.5 2.1641 29.2 0.5 Sco X-1 254.5663 35.5065 4.1 30.0 -117.4 0.2696 2.8 11.2 Her X-1 255.8079 -37.7729 5.6 53.9 6.0 0.5059 2.1 9.5 4U 1700-377 256.3501 -36.2898 5.4 52.8 4.7 -0.4212 -2.1 9.0 GX 349+2 263.0095 -24.7457 126.9 46.5 -10.1 0.0098 0.1 0.0 GX 1+4 268.4448 -1.2492 0.0 36.8 -43.7 0.0914 0.9 13.0 SW J1753.5-0127 270.2612 -25.2808 0.0 51.5 -15.8 -0.1705 -1.1 12.2 GX 5-1 270.2350 -25.8481 5.8 51.9 -15.3 -0.3201 -2.0 7.3 GRS 1758-258 274.0516 -13.9797 8.2 47.6 -30.6 -0.2105 -1.4 4.3 GX 17+2 275.9896 -30.2938 5.0 58.6 -15.3 -0.8391 -2.3 5.5 H1820-303 263.0211 -33.7077 30.4 53.5 -2.8 -0.0751 -0.4 7.8 GX 354-0 209.8825 -8.5172 2.4 31.5 77.8 0.5835 4.8 ------ UNKNOWN 205.9859 44.8127 2.9 40.5 176.8 0.3988 4.0 ------ UNKNOWN 247.4049 57.7290 2.5 46.8 -142.7 0.7346 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 1.672000 109.928000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.0184 -15.6786 2.2 29.8 5.5 -2.0358 -5.3 3.2 Sco X-1 254.5115 35.4511 4.2 29.9 -117.4 -1.3640 -2.8 7.0 Her X-1 256.0215 -37.7402 22.2 53.9 5.8 -0.6782 -0.5 6.4 4U 1700-377 256.3157 -36.4374 25.4 52.9 4.8 -0.5212 -0.5 5.8 GX 349+2 263.1233 -24.7186 10.2 46.5 -10.2 0.6537 1.1 6.4 GX 1+4 268.2678 -1.5820 5.0 36.8 -43.1 1.2114 2.3 9.8 SW J1753.5-0127 270.3523 -25.1143 11.7 51.4 -16.1 -0.7893 -1.0 4.3 GX 5-1 270.2699 -25.8548 5.6 51.9 -15.3 1.7541 2.0 6.9 GRS 1758-258 274.0066 -14.0712 4.7 47.6 -30.4 1.9194 2.5 2.1 GX 17+2 276.0018 -30.3050 5.5 58.6 -15.3 4.3015 2.1 5.4 H1820-303 262.9999 -33.9897 149.5 53.7 -2.6 -0.0913 -0.1 9.3 GX 354-0 242.5691 36.3310 2.3 25.5 -136.1 1.7856 4.9 ------ UNKNOWN 277.5586 -16.3468 2.5 51.7 -30.2 4.8055 4.6 ------ UNKNOWN 263.5398 34.4950 3.0 35.1 -107.3 2.5935 3.9 ------ UNKNOWN 248.2080 61.6096 1.2 50.6 -143.8 11.5834 9.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 755.900620 843.071500 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 255.9573 -37.7093 8.0 31.3 105.6 5.2561 1.4 8.2 4U 1700-377 256.4559 -36.5565 99.7 31.5 107.9 0.4075 0.1 8.1 GX 349+2 262.8764 -24.6135 0.0 34.2 131.8 -5.6391 -1.6 10.7 GX 1+4 264.5774 -44.4232 5.2 22.9 96.6 6.4041 2.2 7.3 4U 1735-44 268.2924 -1.3984 6.9 50.4 158.2 -13.1219 -1.7 5.6 SW J1753.5-0127 270.1320 -25.0564 12.9 29.4 140.4 2.5083 0.9 8.4 GX 5-1 270.3082 -25.8856 11.3 28.7 139.5 -2.7348 -1.0 8.6 GRS 1758-258 273.9776 -13.9165 6.4 36.7 157.3 6.0983 1.8 7.4 GX 17+2 275.9869 -30.2911 8.4 22.1 141.4 -3.2635 -1.4 5.6 H1820-303 284.9097 -25.0942 0.0 22.2 166.6 2.6796 1.2 12.5 HT1900.1-2455 288.8798 10.8297 23.4 56.3 -172.8 4.8855 0.5 8.4 GRS 1915+105 263.1647 -33.8477 5.1 28.2 118.3 -6.2255 -2.3 8.8 GX 354-0 244.0341 -41.0974 2.7 38.2 93.3 27.6217 4.3 ------ UNKNOWN 251.4439 -36.4207 3.8 35.1 104.6 13.7474 3.1 ------ UNKNOWN 100.0631 -81.6340 2.8 53.0 13.7 34.4463 4.1 ------ UNKNOWN 272.3381 -37.2859 3.4 20.0 120.8 8.2534 3.4 ------ UNKNOWN 92.4923 -83.5619 3.2 50.9 13.3 21.3567 3.6 ------ UNKNOWN 16.5428 -62.4288 3.6 46.7 -22.0 13.2192 3.2 ------ UNKNOWN