Gamma-ray Burst 251014A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 14 Oct 25 00:33:56 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1403878,   Seg_Num: 0
GRB_RA:          111.732d {+07h 26m 56s} (J2000),
                 112.078d {+07h 28m 19s} (current),
                 111.062d {+07h 24m 15s} (1950)
GRB_DEC:          +6.415d {+06d 24' 54"} (J2000),
                  +6.361d {+06d 21' 41"} (current),
                  +6.517d {+06d 30' 60"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       1938 [cnts]    Image_Peak=218 [image_cnts]
TRIGGER_DUR:     0.512 [sec] 
TRIGGER_INDEX:   41     E_range: 25-100 keV
BKG_INTEN:       16466 [cnts]
BKG_TIME:        1699.50 SOD {00:28:19.50} UT
BKG_DUR:         8 [sec]
GRB_DATE:        20962 TJD;   287 DOY;   25/10/14
GRB_TIME:        1710.18 SOD {00:28:30.18} UT
GRB_PHI:         -82.07 [deg]
GRB_THETA:        17.47 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     23.51 [sigma]
IMAGE_SIGNIF:    13.27 [sigma]
MERIT_PARAMS:     +1  +0  +0  -1  +2  +2  -5  +0  -2  +0 
SUN_POSTN:       199.33d {+13h 17m 19s}   -8.16d {-08d 09' 53"}
SUN_DIST:         88.20 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      116.98d {+07h 47m 55s}  +25.49d {+25d 29' 06"}
MOON_DIST:        19.69 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      211.21, 10.80 [deg] galactic lon,lat of the burst (or transient
)
ECL_COORDS:      112.43,-15.35 [deg] ecliptic lon,lat of the burst (or transient
)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This Notice was delayed by more than 60 sec past the end of the
 trigger integration interval;  
COMMENTS:        probably due to it occurring during a Malindi downlink session.
  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 15.91,9.61 [deg].
  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(0.0<100sec) coincident with 
the FERMI_GBM event (trignum=782094515).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 14 Oct 25 00:29:00 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     782094515
GRB_RA:          120.400d {+08h 01m 36s} (J2000),
                 120.715d {+08h 02m 52s} (current),
                 119.789d {+07h 59m 09s} (1950)
GRB_DEC:          -7.083d {-07d 04' 59"} (J2000),
                  -7.156d {-07d 09' 22"} (current),
                  -6.944d {-06d 56' 36"} (1950)
GRB_ERROR:       11.25 [deg radius, statistical plus systematic]
GRB_INTEN:       134 [cnts/sec]
DATA_SIGNIF:     7.00 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        20962 TJD;   287 DOY;   25/10/14
GRB_TIME:        1710.34 SOD {00:28:30.34} UT
GRB_PHI:          90.00 [deg]
GRB_THETA:        30.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      1.64
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      85%  GRB
2nd_MOST_LIKELY:  13%  Generic SGR
DETECTORS:       1,1,0, 0,0,0, 0,0,0, 1,0,0, 0,0,
SUN_POSTN:       199.33d {+13h 17m 19s}   -8.16d {-08d 09' 48"}
SUN_DIST:         77.78 [deg]   Sun_angle= 5.2 [hr] (West of Sun)
MOON_POSTN:      116.93d {+07h 47m 43s}  +25.50d {+25d 29' 45"}
MOON_DIST:        32.86 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      227.51, 12.12 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      124.30,-26.98 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251014020/quicklook/glg_lc_medres34_bn251014020.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 71.35,-4.65 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 14 Oct 25 00:29:17 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     782094515
GRB_RA:          120.390d {+08h 01m 34s} (J2000),
                 120.718d {+08h 02m 52s} (current),
                 119.754d {+07h 59m 01s} (1950)
GRB_DEC:          -1.100d {-01d 06' 00"} (J2000),
                  -1.173d {-01d 10' 22"} (current),
                  -0.960d {-00d 57' 37"} (1950)
GRB_ERROR:       6.98 [deg radius, statistical only]
DATA_SIGNIF:     7.40 [sigma]
DATA_INTERVAL:   1.024 [sec]
GRB_DATE:        20962 TJD;   287 DOY;   25/10/14
GRB_TIME:        1710.34 SOD {00:28:30.34} UT
GRB_PHI:          90.00 [deg]
GRB_THETA:        36.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       199.33d {+13h 17m 19s}   -8.16d {-08d 09' 48"}
SUN_DIST:         78.56 [deg]   Sun_angle= 5.2 [hr] (West of Sun)
MOON_POSTN:      116.93d {+07h 47m 44s}  +25.50d {+25d 29' 43"}
MOON_DIST:        26.92 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      222.13, 15.03 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      122.84,-21.14 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251014020/quicklook/glg_lc_medres34_bn251014020.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_782094515.fits

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 14 Oct 25 00:34:21 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1403878,   Seg_Num: 0
GRB_RA:          111.732d {+07h 26m 56s} (J2000),
                 112.078d {+07h 28m 19s} (current),
                 111.062d {+07h 24m 15s} (1950)
GRB_DEC:          +6.415d {+06d 24' 54"} (J2000),
                  +6.361d {+06d 21' 41"} (current),
                  +6.517d {+06d 30' 60"} (1950)
GRB_DATE:        20962 TJD;   287 DOY;   25/10/14
GRB_TIME:        1710.18 SOD {00:28:30.18} UT
TRIGGER_INDEX:   41
GRB_PHI:         -82.07 [deg]
GRB_THETA:        17.47 [deg]
DELTA_TIME:      52.00 [sec]
TRIGGER_DUR:     0.512 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     23.51 [sigma]
IMAGE_SIGNIF:    13.27 [sigma]
LC_URL:          sw01403878000msb.lc
SUN_POSTN:       199.33d {+13h 17m 19s}   -8.17d {-08d 09' 53"}
SUN_DIST:         88.20 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      116.98d {+07h 47m 56s}  +25.48d {+25d 29' 03"}
MOON_DIST:        19.69 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      211.21, 10.80 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      112.43,-15.35 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 15.91,9.61 [deg].

GCN Circular #42238
E. Ambrosi (INAF-IASFPA), V. D'Elia (SSDC & INAF-OAR), R. Gupta (NASA GSFC) and D. M. Palmer (LANL) report on behalf of the Neil Gehrels Swift Observatory Team:
At 00:28:30 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 251014A (trigger=1403878). Swift did not slew immediately due to an observation constraint. The BAT on-board calculated location is RA, Dec 111.732, +6.415 which is
```
   RA(J2000) = 07h 26m 56s
   Dec(J2000) = +06d 24' 54"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single peak structure with a duration of about 1.5 sec. The peak count rate was ~3000 counts/sec (15-350 keV), at ~0 sec after the trigger.
Due to a Moon observing constraint, Swift cannot slew to the BAT position until 21:52 UT on 2025 October 14. There will thus be no XRT or UVOT data for this trigger before this time.
Burst Advocate for this burst is E. Ambrosi (elena.ambrosi AT inaf.it). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/)
GCN Circular #42237
The Fermi GBM team reports the detection of a likely SHORT GRB
At 00:28:30 UT on 14 Oct 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251014A (trigger 782094515.336852 / 251014020).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 114.7, Dec = 7.4 (J2000 degrees, equivalent to J2000 07h 38m, 7d 24'), with a statistical uncertainty of 8.3 degrees.
The angle from the Fermi LAT boresight is 45.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251014020/quicklook/glg_skymap_all_bn251014020.png
The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251014020/quicklook/glg_healpix_all_bn251014020.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251014020/quicklook/glg_lc_medres34_bn251014020.gif
GCN Circular #42239
V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, G.Antipov, A.Sankovich, Yu.Tselik, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A.Sosnovskij (CrAO), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity), D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)
MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) was pointed to the Swift GRB 251014A ( E. Ambrosi et al., GCN 42238) errorbox 26 sec after notice time and 361 sec after trigger time at 2025-10-14 00:34:31 UT, with upper limit up to 18.5 mag. The observations began at zenith distance = 68 deg. The sun altitude is -39.4 deg.
The galactic latitude b = 11 deg., longitude l = 212 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3014236
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________


     391 |         MASTER-SAAO |   C |    60 | 18.5 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #42249
C. de Barra (University College Dublin), J. Smith (UAH), C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team:
"At 00:28:30.34 UT on 14 October 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251014A (trigger 782094515/251014020). which was also detected by Swift BAT (E. Ambrosi et al. 2025, GCN 42238). The Fermi GBM on-ground location is consistent with the Swift BAT position.
The angle from the Fermi LAT boresight is 44 degrees.
The GBM light curve consists of a single emission episode with a duration (T90) of about 1.7 s (50-300 keV). The time-averaged spectrum from T0-0.2 to T0+1.7 s is best fit by a simple power law function with index -1.78 +/- 0.06.
The event fluence (10-1000 keV) in this time interval is (6.2 +/- 0.5)E-07 erg/cm^2. The 64-ms peak photon flux measured starting from T0+0.32 s in the 10-1000 keV band is 6 +/- 1 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
GCN Circular #42250
A. S. Moskvitin, O. I. Spiridonova (SAO RAS), report on behalf of GRB follow-up team.
We observed the field of the GRB 251014A (Ambrosi et al., GCN 42238; The Fermi GBM team, GCN 42237; de Barra et al., GCN 42249) with the 1-m SAO RAS telescope Zeiss-1000 equipped with the CCD-photometer. We obtained 7 x 300 sec. images in Rc band under mediocre weather conditions on 2025.10.14, 00:51:01--01:38:56 UT (t_mid - T0 = 0.77458 hours).
Within our FOV (covers ~80% of northern part of Swift-BAT error circle) we do not detect any new source down to the limiting magnitude of R_lim = 21.5. The field calibrated against nearby USNO-B1.0 stars (R2 magnitudes) and not corrected for the Galactic extinction.
GCN Circular #42257
Rosa L. Becerra (U Roma), Alan M. Watson (UNAM), Camila Angulo Valdez (UNAM), Sahil Atri (U Roma), Nat Butler (ASU), Simone Dichiara (Penn State University), Tsvetelina Dimitrova (ASU), Alexander Kutyrev (GSFC/UMD), William H. Lee (UNAM), Océlotl López (UNAM), Margarita Pereyra (UNAM) and Eleonora Troja (U Roma) report:
We observed the field of GRB 251014A detected by Fermi/GBM (Fermi GBM Team, GCN Circ. 42237) and Swift (Ambrosi et al., GCN Circ. 42238) with the DDOTI/OAN wide-field imager at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir (http://ddoti.astroscu.unam.mx) on the night of 2025-10-14 UTC.
DDOTI observed the Swift/BAT position (Ambrosi et al., GCN Circ. 42238) from 09:12 UTC to 12:27 UTC (from T+8.7 h to T+ 11.9 h after the trigger), obtaining a total exposure of 70 minutes, alternating with other scientific programs.
Comparing our observations to the USNO-B1 and Pan-STARRS PS1 DR2 catalogues, we detect no uncatalogued fading sources within the observed field down to a 5-sigma limiting AB magnitude of:
w >20.3
This value is consistent with the reported by the SAO RAS collaboration (Moskvitin et al. GCN Circ. 42250) and is not corrected for the Galactic extinction.
We thank the staff of the Observatorio Astronómico Nacional on the Sierra of San Pedro Mártir.
GCN Circular #42270
Muskan Yadav (U Rome), Roberto Ricci (U Rome), Yu-Han Yang (U Rome), Rosa L. Becerra (U Rome) and Eleonora Troja (U Rome) report on behalf of the ERC BHianca team:
We observed the field of GRB 251014A detected by Fermi (Fermi Team et al., GCN 42237) and Swift/BAT (Ambrosi et al., GCN 42238) with the FORS2 imager on the ESO VLT UT1 (Antu). Observations began 7.55 hours after the trigger and were carried out in the R filter with an average airmass of ~1.5.
Having no reference image deep enough to compare with our science image, at this stage we are not able to determine whether there are new sources down to the limiting magnitude probed by FORS2. Further observations or an arcsec X-ray counterpart are required to make such a claim.
We thank the staff at the VLT for the rapid execution of these observations.
GCN Circular #42271
R. Woolf, C.C. Cheung, M. Kerr, J.E. Grove (NRL), A. Goldstein (USRA), C.A. Wilson-Hodge, D. Kocevski (MSFC), and M.S. Briggs (UAH) report:
The Glowbug gamma-ray telescope [1,2,3], operating on the International Space Station, reports the detection of GRB 251014A, which was also detected by Fermi/GBM (GCN 42237, 42249) and Swift/BAT (GCN 42238).
Using an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2025-10-14 00:28:30.032 with a duration of 1.02 s and a total significance of about 9.9 sigma. The light curve is dominated by a single peak.
The analysis results presented here are preliminary and use a response function that lacks a detailed characterization of the surrounding passive structure of the ISS.
Glowbug is a NASA-funded technology demonstrator for sensitive, low-cost gamma-ray transient telescopes developed, built, and operated by the U.S. Naval Research Laboratory (NRL) with support from the University of Alabama in Huntsville, USRA, and NASA MSFC. It was launched on 2023 March 15 aboard the Department of Defense Space Test Program’s STP-H9 to the ISS, and operated until 2024 April when it was put in safe storage on orbit. Glowbug was removed from storage and resumed operation on 2025 September 12.
```
[1] Grove, J.E. et al. 2020, Proc. Yamada Conf. LXXI, arXiv:2009.11959
[2] Woolf, R.S. et al. 2022, Proc. SPIE, 12181, id. 121811O
[3] Woolf, R.S. et al. 2024, Proc. SPIE, 13151, id. 1315108
```
Distribution Statement A: Approved for public release. Distribution is unlimited.
GCN Circular #42273
J. Durbak (UMD), O. Guiffreda (UMD), N. Passaleva (U Rome), M. Elkabir (U Rome), A. S. Kutyrev (NASA/GSFC), E. Troja (U Rome), S. B. Cenko (NASA/GSFC)
Following the Swift BAT (Ambrosi et al, GCN 42238) and Fermi GBM (Fermi GBM Team, GCN 42237) detection, we observed the transient field in J-filter with PRIME ~1 hour after Swift and Fermi detection.
After comparing a previous J-band epoch observed in this location on 2024-11-17, we detect no new sources in J-band within the Swift BAT localization region. Using nearby 2MASS stars for preliminary calibration we derive a limiting magnitude >19.7 AB for the previous epoch, not corrected for Galactic extinction.
Further observations are planned to obtain deeper imaging.
PRIME is a 1.8m telescope with 1.56 square degree FOV (0.5 arcsec/pixel) located in Sutherland, South Africa at the South African Astronomical Observatory (SAAO) (Kutyrev et al. 2023, Yama et al. 2023, Durbak et al. 2024).
We thank the Osaka University observers at PRIME and the staff at SAAO for their support with these observations.
GCN Circular #42278
M. J. Moss (GSFC), E. Ambrosi (INAF-IASFPA), S. D. Barthelmy (GSFC), R. Gupta (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Parsotan (GSFC), D. Sadaula (GSFC/UMBC), T. Sakamoto (AGU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 251014A (trigger #1403878) (Ambrosi, et al., GCN Circ. 42238). The BAT ground-calculated position is RA, Dec = 111.728, 6.420 deg which is
```
   RA(J2000)  =  07h 26m 54.7s 
   Dec(J2000) = +06d 25' 10.7" 
```
with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 78%.
The BAT mask-weighted light curve shows a single peaked emission with total duration of less than 2 sec. T90 (15-350 keV) is 1.56 +- 0.24 sec (estimated error including systematics).
The time-averaged spectrum from T-0.07 to T+1.82 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 0.82 +- 0.70, and Epeak of 47.1 +- 9.2 keV (chi squared 60.50 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 2.3 +- 0.2 x 10^-07 erg/cm2 and the 1-sec peak flux measured from T-0.07 sec in the 15-150 keV band is 2.8 +- 0.2 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.90 +- 0.13 (chi squared 69.47 for 57 d.o.f.). All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at https://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1403878
GCN Circular #42307
A.P. Beardmore (U. Leicester), A. Melandri (INAF-OAR), T. Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB), J.A. Kennea (PSU), D.N. Burrows (PSU), S. Lanava (PSU), J.P. Osborne (U. Leicester) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
We have analysed 6.2 ks of Photon Counting (PC) mode XRT data for GRB 251014A, collected between T0+101.1 ks and T0+174.7 ks.
Three uncatalogued X-ray sources have been detected within the estimated 3-sigma Swift-BAT error region (296 arcsec), however none of them is above the RASS limit or shows definitive signs of fading. Therefore, at the present time we cannot identify which, if any, is the afterglow. Details of these sources are given below:
Source 5:
```
  RA (J2000.0):  111.7316  =  07h 26m 55.58s
  Dec (J2000.0): +6.4150  =  +06d 24' 53.9"
  Error: 6.7 arcsec (radius, 90% conf.)
  Count-rate: (2.33 [+0.88, -0.72])e-3 ct s^-1	 
  Distance: 1 arcsec from Swift-BAT position.
  Flux: (1.11 [+0.42, -0.34])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)
```
Source 8:
```
  RA (J2000.0):  111.6918  =  07h 26m 46.04s
  Dec (J2000.0): +6.4252  =  +06d 25' 30.7"
  Error: 6.1 arcsec (radius, 90% conf.)
  Count-rate: (2.25 [+0.88, -0.72])e-3 ct s^-1	 
  Distance: 148 arcsec from Swift-BAT position.
  Flux: (7.1 [+2.8, -2.3])e-14 erg cm^-2 s^-1 (observed, 0.3-10 keV)
```
Source 9:
```
  RA (J2000.0):  111.7868  =  07h 27m 08.82s
  Dec (J2000.0): +6.3731  =  +06d 22' 23.3"
  Error: 5.6 arcsec (radius, 90% conf.)
  Count-rate: (1.42 [+0.73, -0.56])e-3 ct s^-1	 
  Distance: 247 arcsec from Swift-BAT position.
  Flux: (4.8 [+2.5, -1.9])e-14 erg cm^-2 s^-1 (observed, 0.3-10 keV)
```
Seven uncatalogued sources were also detected too far from the GRB position to be likely afterglow candidates.
The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/ToO_GRBs/01403878.
This circular is an official product of the Swift-XRT team.

Back to JG's homepage

Jochen Greiner, last update: 16-Oct-2025 [Disclaimer]