GRB080825B

This page lists all entries on GRB080825B in GRBweb

Summary IPN GCN 8133 GCN 8135 GCN 8140 GCN 8142 GCN 8143 GCN 8158

Summary table
Variable Value Source
T0 17:46:40 UTC GCN_circulars,superAGILE
ra 209.2833° IPN
decl -68.9500° IPN
pos_error 5.00e-02° IPN
GBM_located False
mjd 54703.74074074074 GCN_circulars,superAGILE
IPN table
GRB_name GRB080825B
ra 209.2833°
decl -68.9500°
pos_error 5.00e-02°
GCN 8133 table
GRB_name GRB080825B
GCN_number 8133
Detection_method superAGILE
t_trigger 17:46:40 UTC
ra 209.2810°
decl -68.9430°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8133 SUBJECT: GRB 080825B: GRB Localization by SuperAGILE DATE: 08/08/25 20:11:07 GMT FROM: Marco Feroci at IASF/INAF Y. Evangelista, P. Soffitta, E. Del Monte, I. Donnarumma, M. Feroci, F. Lazzarotto, L. Pacciani, E. Costa, I. Lapshov, M. Rapisarda (INAF/IASF Rome), A. Giuliani, S. Vercellone, A. Chen, S. Mereghetti, A. Pellizzoni, F. Perotti, F. Fornari, P. Caraveo (INAF/IASF Milan), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, A. Argan, A. Trois (INAF/IASF Rome), G. Barbiellini, F. Longo (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2), M. Prest, E. Vallazza (Universita' dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), and P. Giommi, C. Pittori, B. Preger, P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report: "SuperAGILE detected a gamma ray burst on 25 August 2008, at 17:46:40 UT. The event was approximately 10 degrees off-axis, with a duration of about 50 s in the 20-60 keV energy range, with a multi-peaked structure. The burst position was reconstructed as (RA, Dec) (209.281 deg, -68.943 deg), which is: RA(J2000) = 13h 57m 07.42s Dec(J2000) = -68d 56' 34.0" with an uncertainty of 3' radius. The given uncertainty accounts for both the statistical and systematic errors. An analysis of the AGILE Gamma Ray Imager (GRID) data is in progress." This message may be cited.
GCN 8135 table
GRB_name GRB080825B
GCN_number 8135
Detection_method Optical
ra 209.2009°
decl -68.9551°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8135 SUBJECT: GRB 080825B - optical counterpart candidate DATE: 08/08/26 01:15:20 GMT FROM: Christina Thoene at Niels Bohr Institute,DARK Cosmo Ctr Christina C. Thoene (DARK/NBI), Antonio de Ugarte Postigo (ESO) and Davide Ricci (Univ. of Liege) report: We observed the complete 3' error box of the SuperAGILE GRB 080825B (Evangelista et al., GCN 8133) using the Danish 1.54m + DFOSC at La Silla (Chile) starting Aug. 25 at 23:18:31 UT (5.53 hours after the burst). In the first I-band frame we detect a new source not present in the DSS-2 catalogue at the following coordinates (J2000 +/- 0.7"): RA: 13:56:48.22 DEC: -68:57:18.5 for which we measure an I-band magnitude of 17.4 +/- 0.2 as compared to several USNO-B1 stars. A finding chart can be found at: http://www.sc.eso.org/~adeugart/GRB/080825/080825.jpg Further observations and analysis are ongoing to establish the connection to the GRB and the fading of the object.
GCN 8140 table
GRB_name GRB080825B
GCN_number 8140
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 8140 SUBJECT: GRB 080825B: Swift-XRT team analysis DATE: 08/08/27 02:06:25 GMT FROM: Claudio Pagani at PSU/Swift-XRT C. Pagani reports on behalf of the Swift-XRT team: We have analyzed the Swift XRT data on the field of the AGILE detected GRB 080825B (Evangelista et al., GCN Circ. 8133), consisting of 7.5 ks of Photon Counting data collected from T0+44 ks to T0+78 ks. We detect a point source at the position of the optical afterglow (Thoene et al., GCN Circ. 8135). During the XRT observations the source faded from an initial count rate of 0.05 counts/s to a later count rate of 0.01 counts/s. The spectrum from the PC data can be fitted by an absorbed power law model with photon index of 2.1 and the absorption consistent with the Galactic value along the line of sight (2.10e21 cm^-2, Kalberla et al. 2005). The average observed (unabsorbed) flux of the PC mode data is 5.8e-13 (9.0e-13) ergs cm^-2 s^-1. This Circular is an official product of the Swift-XRT team.
GCN 8142 table
GRB_name GRB080825B
GCN_number 8142
Detection_method Konus-Wind Det
t_trigger 17:46:52.487 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 8142 SUBJECT: Konus-Wind observation of GRB 080825B DATE: 08/08/27 13:26:45 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 most intense part of the GRB 080825B localized by SuperAGILE (Evangelista et al., GCN 8133) triggered Konus-Wind at T0=64012.487 s UT (17:46:52.487). The burst light curve shows a weak emission starting at ~T0-70s, the main multipeaked part (from ~T0-5s to ~T0+15s), and an extended emission seen up to ~T0+40s. As observed by Konus-Wind the burst had a fluence of 7.81(-0.70, +0.83)x10^-6 erg/cm2, and a 256-ms peak flux measured from T0-0.080 s of 1.21(-0.31, +0.32)x10^-6 erg/cm2/s (both in the 20 keV - 1 MeV energy range). The spectrum of the most intense part (from T0 to T0+16.640 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 = -1.13(-0.36, +0.40), and Ep = 72(-9, +11) keV (chi2 = 40.0/51 dof). Fitting by GRBM (Band) model yields: the low-energy photon index is alpha = -1.05(-0.38, +0.56), the high energy photon index beta < -2.52, the peak energy Ep = 71(-9, +11) keV (chi2 = 38.8/50 dof). All the quoted errors are at the 90% confidence level. The Konus-Wind light curve of this GRB is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB080825_T64012/
GCN 8143 table
GRB_name GRB080825B
GCN_number 8143
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 8143 SUBJECT: GRB 080825B: pseudo-z= 0.83 from prompt emission spectrum DATE: 08/08/27 14:29:29 GMT FROM: Alexandre Pelangeon at LATT,OMP,Toulouse We used the spectral parameters of GRB 080825B provided by Golenetskii et al. (GCNC 8142) to compute the spectral pseudo-redshift(**) of this burst localized by SuperAGILE (Evangelista et al., GCN 8133). We find a pseudo-redshift pz= 0.83 0.30 (**) cf. http://www.ast.obs-mip.fr/grb/pz
GCN 8158 table
GRB_name GRB080825B
GCN_number 8158
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 8158 SUBJECT: GRB080825B: Swift/UVOT Upper Limits DATE: 08/08/29 01:10:54 GMT FROM: Peter Brown at PSU P. J. Brown (PSU) reports on behalf of the Swift/UVOT team: The Swift/UVOT observed the field of GRB 080825B starting about 45 ks after the SuperAGILE detection (Evangelista et al., GCN Circ. 8133). We do not detect the optical afterglow seen by Thoene et al. (GCN Circ. 8135) in any of the UVOT filters down to the following 3 sigma upper limits. Filter T_start(s) T_stop Exp(s) MagLimit white 49916 50823 885 >22.1 uvw2 44237 78448 1903 >21.5 uvm2 61477 67242 988 >20.8 uvw1 67248 73020 1036 >20.9 u 73027 73522 483 >20.8 b 49004 49911 885 >21.2 v 45144 61472 1234 >20.5 The above magnitudes are not corrected for the Galactic extinction corresponding to a reddening of E(B-V) ~ 0.25 mag (Schlegel et al., 1998, ApJS, 500, 525). The photometry is on the UVOT photometric system described in Poole et al. (2008, MNRAS, 383,627).