GRB081025A

This page lists all entries on GRB081025A in GRBweb

Summary Fermi GBM IPN Swift GCN 8409 GCN 8411 GCN 8412 GCN 8414 GCN 8415 GCN 8418 GCN 8420 GCN 8445 GCN 8483 GCN 8514

Summary table
Variable Value Source
GRB_name_Fermi GRB081025349
T0 8:22:02 UTC Swift
ra 245.2980° Swift
decl 60.4660° Swift
pos_error 2.23e-02° Swift
T90 22.528 s Fermi_GBM
T90_error 0.724 s Fermi_GBM
T90_start 8:23:04.781 UTC Fermi_GBM
fluence 6.32e-06 erg/cm² Fermi_GBM
fluence_error 1.18e-07 erg/cm² Fermi_GBM
T100 85.309 s
GBM_located False
mjd 54764.34863425926 Swift
Fermi GBM table
GRB_name_Fermi GRB081025349
trigger_name bn081025349
ra 245.4000°
decl 60.5000°
pos_error 3.29e+00°
datum 2008-10-25
t_trigger 8:23:05.293 UTC
T90 22.528 s
T90_error 0.724 s
T90_start 8:23:04.781 UTC
fluence 6.32e-06 erg/cm²
fluence_error 1.18e-07 erg/cm²
flux_1024 4.09e+00 erg/cm²/s
flux_1024_error 1.69e-01 erg/cm²/s
flux_1024_time 9.60e-01 erg/cm²/s
flux_64 5.10e+00 erg/cm²/s
flux_64_error 6.92e-01 erg/cm²/s
IPN table
GRB_name GRB081025A
ra 245.3000°
decl 60.4667°
pos_error 5.00e-02°
Swift table
GRB_name GRB081025A
t_trigger 8:22:02 UTC
ra 245.2980°
decl 60.4660°
pos_error 2.23e-02°
T90 23.0 s
fluence 1.90e-06 erg/cm²
GCN 8409 table
GRB_name GRB081025A
GCN_number 8409
Detection_method Swift-BAT Det
ra 245.2980°
decl 60.4660°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8409 SUBJECT: GRB 081025: Burst detection from Swift-BAT slew data DATE: 08/10/26 01:18:16 GMT FROM: Antonio Copete at Harvard U A. Copete, J. Grindlay (Harvard) J. Cummings, S. Barthelmy, C. Markwardt, N. Gehrels (NASA/GSFC) We report the detection of a GRB candidate by the BAT Slew Survey (BATSS) in the slew that started at 08:22:02 UT. The ground-calculated position is RA, Dec = 245.298 +60.466 deg, which is RA (J2000) = 16h 21m 11s Dec(J2000) = +60d 27' 58" with an uncertainty of 2.87 arcmin (90% confidence, including systematic error). The detection was triggered by simultaneous independent detections of 12.9 sigma and 13.7 sigma from imaging in the 15-50 keV and 50-150 keV energy bands, respectively. The burst profile shows a series of 4 main peaks starting at T+63sec, which a measured T90 = 23sec and T50 = 17sec, and the burst leaves the BAT field-of-view at T+120. A follow-up Swift ToO observation has been scheduled to begin on 10/26/08 at 04:58 UT, 20.6 hours after the burst.
GCN 8411 table
GRB_name GRB081025A
GCN_number 8411
Detection_method Swift-XRT Other
ra 245.3663°
decl 60.4743°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8411 SUBJECT: GRB 081025: Swift-XRT position DATE: 08/10/26 11:08:44 GMT FROM: Cristiano Guidorzi at INAF-OAB J. Mao, C. Guidorzi, R. Margutti (INAF-OAB) report on behalf of the Swift-XRT team: Swift began observing the field of the Swift-BATSS GRB 081025 (Copete et al., GCN Circ. 8409) 74.5 ks after the trigger. In 2.9 ks of Photon Counting mode data, we detect a single uncatalogued source within the BAT error circle at a position of RA, Dec = 245.36626, 60.47428, which is equivalent to RA(J2000): 16 21 27.90 Dec(J2000): +60 28 27.4 with an uncertainty of 6.7 arcsec (radius, 90% containment). The source lies 125 arcsec from the BAT centroid and has a count rate of ~3e-3 counts/s during this observation. It is not possible to determine whether this source is fading given the current statistics. This circular is an official product of the Swift-XRT team.
GCN 8412 table
GRB_name GRB081025A
GCN_number 8412
Detection_method Konus-Wind Det
t_trigger 8:23:06.316 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 8412 SUBJECT: Konus-Wind observation of GRB 081025 DATE: 08/10/26 15:33:49 GMT FROM: Valentin Pal'shin at Ioffe Inst S. Golenetskii, R. Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P. Oleynik, D. Svinkin, M. Ulanov and T. Cline, on behalf of the Konus-Wind team report: The long Swift-BATSS GRB 081025 (Copete et al., GCN 8409) triggered Konus-Wind at T0=30186.316 s UT (08:23:06.316). The burst light curve shows a multipeaked structure with a total duration of ~25 s. As observed by Konus-Wind the burst had a fluence of 5.37(-0.82, +0.96)x10^-6 erg/cm2, and a 256-ms peak flux measured from T0-0.224 s of 8.90(-2.62, +2.75)x10^-7 erg/cm2/s (both in the 20 keV - 1 MeV energy range). The time-integrated spectrum of the burst (from T0 to T0+24.832 s) is well fitted (in the 20 keV-1 MeV range) by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.67(-0.33, +0.43) , and Ep = 222(-46, +81) keV (chi2 = 55.5/60 dof). Fitting by GRBM (Band) model yields only an upper limit on the high energy photon index: beta < -2.07. All the quoted errors are at the 90% confidence level. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB081025_T30186/
GCN 8414 table
GRB_name GRB081025A
GCN_number 8414
Detection_method Swift-UVOT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 8414 SUBJECT: Swift UVOT observations of GRB081025 DATE: 08/10/26 17:50:10 GMT FROM: Patricia Schady at MSSL/Swift P. Schady (MSSL/UCL) and J. Mao (INAF-OAB) report on behalf of the Swift UVOT team. The Swift UltraViolet/Optical Telescope (UVOT) began ToO observations of the Swift-BATSS GRB 081025 (Copete et al., GCN Circ. 8409), 20.7 hours after the trigger. We do not detect any new source at the XRT position reported in GCN Circ. 8411 (Mao et al.) in any of the individual or co-added images down to the following 3-sigma upper limits: Filter Tstart(hrs) Exp(s) 3-sigma UL b 21.2 130 > 19.44 u 20.9 885 > 20.18 uvw1 20.7 1015 > 20.60 uvm2 22.2 886 > 20.63 The values quoted above are on the UVOT Photometric System (Poole et al, 2008, MNRAS 383,627). They are not corrected for the expected Galactic extinction corresponding to a reddening of E(B-V)=0.02 mag in the direction of the burst (Schlegel et al. 1998).
GCN 8415 table
GRB_name GRB081025A
GCN_number 8415
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 8415 SUBJECT: GRB 081025 BAT refined analysis DATE: 08/10/26 19:12:08 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift J. R. Cummings (GSFC/UMBC), A. Copete (Harvard), J. Grindlay (Harvard), S. D. Barthelmy (GSFC), N. Gehrels (GSFC), C. Guidorzi (INAF-OAB) Using the data set from T+9 to T+129 sec (T0 is here defined as the beginning of the Swift slew manuever), we report further analysis of BATSS GRB 081025 (Copete, et al., GCN Circ. 8409). Using the the previously reported position, the partial coding averaged over the event was 70%. This is 2.1 arcmin from the XRT afterglow candidate (Mao et al. GCN Circ. 8411). The mask-weighted lightcurve features a main peak starting at T+63 sec lasting 12 sec, followed in succession by 3 peaks, a 1.4 sec long peak at T+77 sec, a 4.2 sec long peak at T+83sec, and a 2.2 sec long peak at T+88sec. T90 (15-350 keV) is 23 +- 2 sec (estimated error including systematics). The time-averaged spectrum from T+63 to T+89 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.12 +- 0.05. The fluence in the 15-150 keV band is (1.9 +- 0.2) x 10-06 erg/cm2. The 1-sec peak photon flux measured from T+68 sec in the 15-150 keV band is 1.3 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The results of the analysis will be available (in a few days) at http://gcn.gsfc.nasa.gov/notices_s/BATS0021/BA/
GCN 8418 table
GRB_name GRB081025A
GCN_number 8418
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 8418 SUBJECT: GRB081025: RTT150 optical observations DATE: 08/10/27 09:09:48 GMT FROM: Rodion Burenin at IKI, Moscow I. Khamitov (TUG), N. Aleksandrovich, R. Burenin, M. Pavlinsky, R. Sunyaev (IKI), I. Bikmaev, N. Sakhibullin (KSU/AST), Z. Eker (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.) report: We observed the field of the Swift-BATSS GRB 081025 (Copete et al., GCN8409) with Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National Observatory, Turkey), starting at 25 Oct, 19:51 UT, i.e. approximately 11.5 hours after the burst, using Andor CCD. We made 3x300s exposures in sdss-g filter, at high zenith distance (~70 degree) and with bad seeing ~ 3". We do not detect any new source inside the XRT error circle (Mao et al., GCN8411) as compared to DSS plates. Using photometric solution from previous nights we estimated the limiting magnitude of combined image as m_g ~ 22.
GCN 8420 table
GRB_name GRB081025A
GCN_number 8420
Detection_method Swift-BAT Det
ra 245.3672°
decl 60.4784°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8420 SUBJECT: GRB 081025: TLS upper limits DATE: 08/10/28 00:28:59 GMT FROM: Alexander Kann at TLS Tautenburg D. A. Kann, S. Schulze, C. Hoegner, S. Klose (TLS Tautenburg) and J. Greiner (MPE Garching) report: We observed the BAT Slew GRB 081025 (A. Copete et al., GCN 8409) with the TLS Tautenburg 1.34m Schmidt telescope. Observations were initialized in RRM mode (S. Klose et al., GCN 3609) as the BAT_SLEW_POSITION had been received at dusk. After obtaining 2 x 120 sec Ic-band images, we realized the large time delay and switched to deeper imaging. We further obtained 2 x 600 sec Ic-band images and one 600 sec Rc-band image. At the position of the X-ray afterglow candidate (J. Mao et al., GCN 8411), we do not detect any source. We find the following upper limits in comparison with the USNOB1.0 star at (catalog position, J2000) R.A. = 16:21:28.125, Dec. = +60:28:42.35, which has R2 = 18.61, I = 17.84: dt exp Filter upper limit (2 sigma) 0.38672 2x120+2x600 Ic 21.5 0.40047 1x600 Rc 22.5 These limits are in agreement with the g-band limit of Khamitov et al. (GCN 8418). We point out the existence of the galaxy cluster NSC 2162144+602602 at z=0.3903 (accoriding to SIMBAD) to the southeast of the afterglow position. The nearest galaxy (about 100" distant) seems to be a massive elliptical, possible a cD galaxy. No further observations are planned. This message may be cited.
GCN 8445 table
GRB_name GRB081025A
GCN_number 8445
Detection_method Suzaku WAM Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 8445 SUBJECT: GRB 081025: Suzaku WAM observation of the prompt emission DATE: 08/10/29 09:53:27 GMT FROM: Yoshitaka Hanabata at Hiroshima U C. Kira, Y. Hanabata, T. Uehara, T. Takahashi, Y. Fukazawa(Hiroshima U.), T. Enoto, K. Nakazawa, K. Makishima (Univ. of Tokyo), S. Sugita, K. Yamaoka (Aoyama Gakuin U.), M. Ohno, M. Kokubun, M. Suzuki, T. Takahashi (ISAS/JAXA), Y.E. Nakagawa, T. Tamagawa (RIKEN), M. Tashiro, Y. Terada, Y. Urata, A. Endo, K. Onda, N. Kodaka, K. Morigami, T. Sugasahara, W. Iwakiri (Saitama U.), E. Sonoda, M. Yamauchi, H. Tanaka, R. Hara, N. Ohmori, K. Kono, H.Hayashi, (Univ. of Miyazaki),S. Hong (Nihon U.), on behalf of the Suzaku WAM team, report: The long GRB 081025 (Copete et al., GCN 8409) triggered the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 2008-10-25 08:23:07 UT (=T0). The observed light curve shows a multi-peaked structure starting at T0-0.5s, ending at T0+21.5s, with a duration (T90) of about 22 seconds. The fluence in 100 - 1000 keV was 3.8(-0.7, +0.5)*10^-06 erg/cm^2. The 1-s peak flux measured from T0 was 1.5 +/- 0.2 photons/cm^2/s in the same energy range. Preliminary result shows that the time-averaged spectrum from T0-0.5s to T0+21.5s is well fitted by a single power-law with a photon index of 1.93 (-0.25, +0.29) (chi^2/d.o.f = 10/9). All the quoted errors are at statistical 90% confidence level, in which the systematic uncertainties are not included. The light curves for this burst are available at: http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html
GCN 8483 table
GRB_name GRB081025A
GCN_number 8483
Detection_method Fermi GBM Det
t_trigger 8:23:05.290 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 8483 SUBJECT: GRB 081025: Fermi GBM observation DATE: 08/11/05 17:11:18 GMT FROM: Andreas von Kienlin at MPE A. von Kienlin (MPE) and E. Bissaldi (MPE) report on behalf of the Fermi GBM Team: "At 08:23:05.29 UT on 25 October 2008, the Fermi GBM triggered and located GRB 081025 (trigger 246615786 / 081025349) which was also detected by the SWIFT-BAT Slew Survey (A. Copete et al. 2008, GCN 8409) and followed up by SWIFT-XRT (J. Mao et al. 2008, GCN 8411). The GBM on-ground location is consistent with the Swift position. The GBM light curve shows a multipeaked structure with a duration (T90) of about 45 s (8-1000 keV). The time-averaged spectrum from T0-1.536 s to T0+24.064 s is best fit by an exponentially cutoff power law model with Epeak = 251 +/- 25 keV, and index -0.35 +/- 0.13 (chi squared 736 for 700 d.o.f.). The event fluence (8-1000 keV) in this time interval is (7.1 +/- 0.5)E-06 erg/cm^2. The 1-sec photon flux measured from T+2.56 sec in the 8-1000 keV band is 4.50 +/- 0.22 ph/cm2/sec. A Band function fit the spectrum equally well (chi squared 732 for 699 d.o.f.) with Epeak= 200 +/- 33 keV, alpha = 0.15 +/- 0.22 and beta = -2.05 +/- 0.25. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN 8514 table
GRB_name GRB081025A
GCN_number 8514
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 8514 SUBJECT: GRB 081025: Swift-XRT further analysis DATE: 08/11/10 17:05:33 GMT FROM: Jirong Mao at INAF-OAB J. Mao (INAF-OAB) on behalf of the Swift-XRT team reports: Swift-XRT re-observed the Swift-BATSS GRB 081025 (Copete et al., GCN 8409) from 12.9 days after the burst with an exposure time of 6.9 ks. We did not detect any source in the field. The 3-sigma upper limit is 1.7e-3 count/s. We compared this result with the previous observation (Mao et al., GCN 8411). Thus we confirm that XRT observed the fading afterglow of GRB 081025. This circular is an official product of the Swift-XRT team.