GRB080413B

This page lists all entries on GRB080413B in GRBweb

Summary IPN Swift GCN 7598 GCN 7599 GCN 7600 GCN 7601 GCN 7606 GCN 7608 GCN 7610 GCN 7611 GCN 7612 GCN 7615 GCN 7617 GCN 7623 GCN 7626 GCN 7629

Summary table
Variable Value Source
T0 8:51:12 UTC GCN_circulars,Swift Det
ra 326.1444° Swift
decl -19.9812° Swift
pos_error 6.47e-05° Swift
T90 8.0 s Swift
T90_start 8:51:12 UTC Swift
fluence 3.20e-06 erg/cm² Swift
redshift 1.1000
T100 8.0 s
GBM_located False
mjd 54569.36888888889 GCN_circulars,Swift Det
IPN table
GRB_name GRB080413B
ra 326.1333°
decl -19.9667°
pos_error 5.00e-02°
redshift 1.1000
Swift table
GRB_name GRB080413B
t_trigger 8:51:12 UTC
ra 326.1444°
decl -19.9812°
pos_error 6.47e-05°
T90 8.0 s
fluence 3.20e-06 erg/cm²
redshift 1.1000
GCN 7598 table
GRB_name GRB080413B
GCN_number 7598
Detection_method Swift Det
t_trigger 8:51:12 UTC
ra 326.1340°
decl -19.9690°
Circular_text TITLE: GCN CIRCULAR NUMBER: 7598 SUBJECT: GRB 080413B: Swift detection of a possibly short burst with optical counterpart DATE: 08/04/13 09:20:28 GMT FROM: David Palmer at LANL M. Stamatikos (NASA/ORAU), A. P. Beardmore (U Leicester), N. Gehrels (NASA/GSFC), S. D. Hunsberger (PSU), C. B. Markwardt (CRESST/GSFC/UMD), J. P. Osborne (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), T. Sakamoto (NASA/UMBC), R. L. C. Starling (U Leicester) and E. Troja (U Leicester/INAF-IASFPA) report on behalf of the Swift Team: At 08:51:12 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 080413B (trigger=309111). Swift started slewing approximately 70 seconds after the burst. The BAT on-board calculated location is RA, Dec 326.134, -19.969 which is RA(J2000) = 21h 44m 32s Dec(J2000) = -19d 58' 08" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single peaked structure with a duration of about 3 sec. The peak count rate was ~15,000 counts/sec (15-350 keV), at ~0.2 sec after the trigger. The XRT began observing the field at 08:53:23.8 UT, 131.2 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 326.14434, -19.98104 which is equivalent to: RA(J2000) = 21h 44m 34.64s Dec(J2000) = -19d 58' 51.7" with an uncertainty of 2.6 arcseconds (radius, 90% containment). This location is 55 arcseconds from the BAT onboard position, within the BAT error circle. A power-law fit to a spectrum formed from promptly downlinked event data does not constrain the column density, so we cannot provide limits on the redshift using spectroscopy and the relation from Grupe et al. (2007). A summary of the promptly downlinked data is given at http://www.swift.ac.uk/sper/309111/. UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 134 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at RA(J2000) = 21:44:34.68 = 326.1445 DEC(J2000) = -19:58:52.0 = -19.9811 with a 1-sigma error radius of about 0.6 arc sec. This position is 0.6 arc sec. from the XRT position. The estimated magnitude is 16.5 with a 1-sigma error of about 0.5 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.04. Burst Advocate for this burst is M. Stamatikos (michael AT milkyway.gsfc.nasa.gov). 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/too.html.)
GCN 7599 table
GRB_name GRB080413B
GCN_number 7599
Detection_method GROND
ra 326.1445°
decl -19.9812°
Circular_text TITLE: GCN CIRCULAR NUMBER: 7599 SUBJECT: GRB 080413B: GROND detection of afterglow in all bands DATE: 08/04/13 09:32:15 GMT FROM: Jochen Greiner at MPI T. Kruehler, J. Greiner, A. Kupcu Yoldas, C. Clemens, A. Yoldas (all MPE Garching) and G. Szokoly (Eoetvoes Univ. Budapest and MPE Garching) report on behalf of the GROND team: We observed the field of GRB 080413B detected by Swift/BAT (trigger 309111, Stamatikos et al. 2008, GCN Circ. 7598) simultaneously in g'r'i'z'JHK with GROND mounted at the 2.2m ESO/MPI telescope at La Silla Observatory (Chile). Observations started at 08:56 UT on April 13th, 2008, 5 min after the burst. We detect a new bright point source at RA (J2000) = 21:44:34.67 DEC (J2000) = -19:58:52.4 with an uncertainty of 0.5", which is consistent with the UVOT position. The object is detected in all seven bands, implying a redshift smaller than 3.5. Preliminary photometry of the first 4 min exposure yields an J band magnitude of 16.5 calibrated against 2MASS field stars. The given magnitude is not corrected for the Galactic foreground reddening of E(B-V)=0.04 mag (Schlegel et al., 1998).
GCN 7600 table
GRB_name GRB080413B
GCN_number 7600
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 7600 SUBJECT: GRB080413B: REM NIR & Optical Observation DATE: 08/04/13 10:06:45 GMT FROM: Angelo Antonelli at Obs. Astro. di Roma L.A. Antonelli, S. Covino, P. D'Avanzo, D. Fugazza, L. Calzoletti, S. Campana, G. Chincarini, M.L. Conciatore, S. Cutini, V. D'Elia, F. D'Alessio, F. Fiore, P. Goldoni, D. Guetta, C. Guidorzi, G.L. Israel, E. Maiorano, N. Masetti, A. Melandri, E. Meurs, L. Nicastro, E. Palazzi, E. Pian, S. Piranomonte, L. Stella, G. Stratta, G. Tagliaferri, G. Tosti, V.Testa, S.D. Vergani, F. Vitali report on behalf of the REM team: The robotic 60-cm REM telescope located at La Silla (Chile) observed automatically the field of the GRB 080413B on April 13 08:52:43 UT (about 91 seconds after the burst). The afterglow reported in GCN 7598, 7599 (Stamatikos et al., Kruehler et al.) is well detected in our early images at about H~14.3. Further analyses and observations are in progress.
GCN 7601 table
GRB_name GRB080413B
GCN_number 7601
Detection_method Other
redshift 1.1000
Circular_text TITLE: GCN CIRCULAR NUMBER: 7601 SUBJECT: GRB 080413B: VLT redshift DATE: 08/04/13 10:58:47 GMT FROM: Daniele Malesani at Niels Bohr Inst,Dark Cosmology Center Paul M. Vreeswijk, Christina C. Thoene, Daniele Malesani, Johan P. U. Fynbo, Jens Hjorth (DARK/NBI), Pall Jakobsson (Univ. Hertfordshire), Nial R. Tanvir (Univ. Leicester), and Andrew J. Levan (Univ. Warwick), report on behalf of a larger collaboration: We observed the afterglow of the possibly short GRB 080413B (Stamatikos et al., GCN 7598) with the ESO VLT equipped with FORS1. A 600 s spectrum centered on Apr 13.403 UT (49.5 min after the GRB) was acquired covering the range 3500-9000 AA. From detection of numerous absorption features, including Fe II, Mg II and Mg I lines, we infer a redshift z = 1.10. In particular, we detect the Fe II 2396 fine-structure line, which confirms this redshift is very likely that of the host of the GRB. We acknowledge excellent support from the VLT staff, particularly Thomas Szeifert, Jose Cortes, and Gianni Marconi.
GCN 7606 table
GRB_name GRB080413B
GCN_number 7606
Detection_method Swift-BAT Det
ra 326.1380°
decl -19.9810°
Circular_text TITLE: GCN CIRCULAR NUMBER: 7606 SUBJECT: GRB 080413B, Swift-BAT refined analysis DATE: 08/04/13 17:27:57 GMT FROM: Scott Barthelmy at NASA/GSFC S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), K. McLean (GSFC/UMD), D. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-119 to T+148 sec from recent telemetry downlinks, we report further analysis of BAT GRB 080413B (trigger #309111) (Stamatikos, et al., GCN Circ. 7598). The BAT ground-calculated position is RA, Dec = 326.138, -19.981 deg, which is RA(J2000) = 21h 44m 33.1s Dec(J2000) = -19d 58' 49.8" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 20%. The mask-weighted light curve shows a single FRED-like peak starting at T-1.1 sec, peaking at T+0.2 sec, and returning to baseline at ~T+30 sec. T90 (15-350 keV) is 8.0 +- 1.0 sec (estimated error including systematics). The time-averaged spectrum from T-1.3 to T+10.7 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.26 +- 0.27, and Epeak of 73.3 +- 15.8 keV (chi squared 32.60 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 3.2 +- 0.1 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T-0.26 sec in the 15-150 keV band is 18.7 +- 0.8 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.80 +- 0.06 (chi squared 45.07 for 57 d.o.f.). All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/309111/BA/
GCN 7608 table
GRB_name GRB080413B
GCN_number 7608
Detection_method Swift Other
redshift 1.1000
Circular_text TITLE: GCN CIRCULAR NUMBER: 7608 SUBJECT: GRB 080413B: Swift XRT refined analysis DATE: 08/04/13 18:55:01 GMT FROM: Eleonora Troja at INAF-IASFPA E. Troja (U. Leicester/INAF-IASFPa) and M. Stamatikos (NASA/ORAU) report on behalf of the Swift-XRT team: We have analysed 9.9 ks of Swift XRT data for GRB 080413B (Stamatikos et al. GCN Circ. 7598), from T0+134 s to T0+20.1 ks. The data set consists of 376 s exposure in Windowed Timing (WT) mode followed by 9.5 ks exposure in Photon Counting (PC) mode. By using orbits 2-4 of PC data [from T0+6.0 ks to T0+20.1 ks] in order to avoid pile-up effects, we derive an XRT refined position RA (2000) = 21h 44m 34.43s = 326.1435 d Dec (2000) = -19d 58' 52.9" = -19.9814 d with an uncertainty of 3.7 arcsec (90% containment). This position is 3.6 arcsec from the UVOT candidate afterglow (GCN Circ. 7598), and 3.4 arcsec from the source reported in Kruehler et al. (GCN Circ. 7599). The X-ray light curve is well fitted by a simple power-law, with a decay slope of 0.88 +/- 0.06. A spectrum obtained from the WT mode data, from T0+135 s to T0+511 s, can be modelled with an absorbed power-law with a photon index of 2.05 +/- 0.10 , and a redshifted absorbing column of (0.32 +/- 0.13) x 10^22 cm^-2 at a redshift of z=1.1 (Vreeswijk et al. GCN Circ 7601) in addition to the Galactic column of 3.06 x 10^20 cm^-2 (Kalberla et al. 2005). The observed (unabsorbed) 0.3-10 keV flux in this spectrum is 1.79 x 10^-10 (2.13 x 10^-10) erg/cm^2/s. The PC spectrum of the first four orbits, from T0+512 s to T0+20.1 ks, can be fit by an absorbed power-law model with photon index 1.93 +/- 0.08 and a column density consistent with the WT spectrum. All the reported errors are at the 90% confidence level. If the source continues to decay at the present rate, we predict a count rate of 0.035 count/sec at T0+24 hours, which corresponds to a 0.3-10 keV observed (unabsorbed) flux of 1.6 x 10^-12 (1.8 x 10^-12) erg/cm^2/s. This circular is an official product of the Swift-XRT team.
GCN 7610 table
GRB_name GRB080413B
GCN_number 7610
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 7610 SUBJECT: Swift-BAT spectral lag analysis of GRB 080413B DATE: 08/04/13 19:59:34 GMT FROM: Michael Stamatikos at GSFC T. Sakamoto (GSFC/UMBC), T. Ukwatta (GWU), M. Stamatikos (GSFC/ORAU), S. D. Barthelmy (GSFC), N. Gehrels (GSFC), We further report on additional spectral lag analysis regarding the possible short duration burst classification of GRB 080413B (Stamatikos et al. GCN Circ. 7598). We now believe GRB 080413B to be a long GRB based upon the following BAT prompt emission properties: 1) The spectral lag in 25-50 to 100-350 keV bands and 15-25 to 50-100 keV bands are 0.238 +- 0.016 sec and 0.136 +- 0.008 sec for 4 ms binning. Therefore, GRB 080413B shows a significant lag. 2) The T90 of the spike is 8.0 +- 1.0 sec based on the mask-weighted light curve (Barthelmy et al., GCN 7606), which is well within the long duration GRB population (Sakamoto et al. ApJS, 175, 179).
GCN 7611 table
GRB_name GRB080413B
GCN_number 7611
Detection_method Swift-BAT Det
ra 326.1444°
decl -19.9812°
Circular_text TITLE: GCN CIRCULAR NUMBER: 7611 SUBJECT: GRB080413B DATE: 08/04/13 20:38:00 GMT FROM: Samantha Oates at MSSL S. R. Oates and M. Stamatikos report on behalf of the Swift/UVOT team. The Swift/UVOT began settled observations of the field of GRB 080413B 135s after the BAT trigger (Stamatikos et al., GCN 7598). We detect the afterglow in the 7 UVOT filters at the position: RA(J2000) = 21:44:34.65 DEC(J2000) = -19:58:52.40 with an estimated uncertainty of 0.5 arcsec (radius, 90% confidence). This position is consistent with the refined XRT position and the GROND optical position (Kruehler et al., GCN 7599). The magnitudes are reported below: Filter T_Mid(s) Expo(s) Magnitude ------------------------------------------------------- White 184 98 16.67 0.02 White 740 10 17.67 0.15 v 440 393 17.64 0.10 v 1183 393 18.64 0.22 b 727 10 18.82 0.71 u 796 19 17.67 0.27 w1 682 19 17.42 0.27 m2 810 19 18.07 0.47 w2 762 19 17.92 0.36 ------------------------------------------------------- The above magnitudes are not corrected for the Galactic extinction corresponding to a reddening of E_{B-V} = 0.04 mag (Schlegel et al., 1998, ApJS, 500, 525). The photometry is on the UVOT flight system described in Poole et al. (2008,MNRAS,383,627).
GCN 7612 table
GRB_name GRB080413B
GCN_number 7612
Detection_method Swift-BAT Det
redshift 1.1000
Circular_text TITLE: GCN CIRCULAR NUMBER: 7612 SUBJECT: GRB 080413B: Ep,i-Eiso correlation DATE: 08/04/13 22:47:19 GMT FROM: Lorenzo Amati at INAF-IASF/Bologna L. Amati (INAF - IASF Bologna), By assuming the VLT redshift of 1.10 (Vreeswijk et al., GCN 7601), the values of spectral parameters alpha and Ep, and the fluence, provided by Swift/BAT (Barthelmy et al., GCN 7606), a value of spectral parameter beta of -2.3 and a Lambda-CDM cosmology with H0=70 km/s/Mpc, Omega_M=0.27 and Omega_Lambda=0.73, the values of Ep,i and Eiso (1-10000 keV cosmological rest-frame) of GRB 080413B are approximately 150+/30 keV and (2.4+/-0.2)x10^52 erg, fully consistent with the Ep,i-Eiso correlation. Given that this correlation holds for long GRBs only (see, e.g., Amati, MNRAS, 2006; Amati, astroph/0611189), this is a further evidence that GRB 080412B is not a short GRB. This message may be cited.
GCN 7615 table
GRB_name GRB080413B
GCN_number 7615
Detection_method Other
redshift 1.1000
Circular_text TITLE: GCN CIRCULAR NUMBER: 7615 SUBJECT: GRB 080413B: Gemini-South Spectroscopy DATE: 08/04/14 16:42:35 GMT FROM: Antonino Cucchiara at PSU A. Cucchiara and D. B. Fox (Penn State) with S. B. Cenko (Caltech), report on behalf of a larger collaboration: "Starting on 2008 April 13.41 UT we observed GRB 080413B (Stamatikos et al. GCN 7598) with the GMOS spectrograph on the Gemini South telescope. We obtained a single 900-sec spectrum in the wavelength range 3900-6700A. The resolution of our spectrum is 5 Ang/pixel (R ~ 1100 at 5900A). We clearly observe several metal absorption features corresponding to the MgII doublet (2796,2803 A), MgI (2853A), FeII (2586A and 2600A), and FeI (3021A). These identifications are consistent with a host galaxy redshift of z = 1.10, confirming the result reported from VLT observations by Vreeswijk et al.(GCN 7601)."
GCN 7617 table
GRB_name GRB080413B
GCN_number 7617
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 7617 SUBJECT: VLA radio observations of GRB 080413B DATE: 08/04/14 17:34:10 GMT FROM: Poonam Chandra at U Virginia/NRAO Poonam Chandra (NRAO/UVA) and Dale A. Frail (NRAO) report on behalf of the Caltech-NRAO-Carnegie GRB Collaboration: "We used the Very Large Array to observe the field of view toward GRB 080413B (GCN 7598) at a frequency of 8.46 GHz at 2008 April 14.59 UT. We do not detect the GRB afterglow at the GROUND optical position (GCN 7599). The flux density at the GRB afterglow position is 86 36 uJy. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc."
GCN 7623 table
GRB_name GRB080413B
GCN_number 7623
Detection_method Suzaku WAM Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 7623 SUBJECT: GRB 080413B: Suzaku WAM observation of the prompt emission DATE: 08/04/16 15:33:02 GMT FROM: Kazutaka Yamaoka at Aoyama Gakuin U T. Enoto (Univ. of Tokyo), Y.E. Nakagawa, T. Tamagawa (RIKEN), T. Uehara, T. Takahashi, Y. Fukazawa, C. Kira, Y. Hanabata (Hiroshima U.), K. Yamaoka, S. Sugita (Aoyama Gakuin U.), M. Tashiro, Y. Terada, Y. Urata, A. Endo, K. Onda, N. Kodaka, K. Morigami (Saitama U.), K. Nakazawa, K. Makishima (Univ. of Tokyo), E. Sonoda, M. Yamauchi, H. Tanaka, R. Hara (Univ. of Miyazaki), M. Ohno, M. Kokubun, M. Suzuki, T. Takahashi (ISAS/JAXA), S. Hong (Nihon U.), on behalf of the Suzaku WAM team, report: The Swift GRB 080413B (Swift/BAT trigger #309111 ; Stamatikos et al., GCN 7598) was detected by the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 8:51:11.645 UT (=T0). The observed light curve shows a single peak starting at T0-0s, with a duration (T90) of about 2 seconds. The fluence in 150 - 1000 keV was (1.4 +/- 0.3) x 10^-6 erg/cm^2. The 1-s peak flux measured from T0+1s was 3.4 +/- 0.2 photons/cm^2/s in the same energy range. Preliminary result shows that the time-averaged spectrum from T0-1s to T0+8s is fitted by a single power-law with a photon index of 3.02 (+0.36, -0.32) (chi^2/d.o.f = 16.7/16) in 150 - 1000 keV. All the quoted errors are at statistical 90% confidence level, in which the systematic uncertainties are not included. The light curves with 1-sec time resolution for this burst are now available at: http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/untrig/grb_table.html
GCN 7626 table
GRB_name GRB080413B
GCN_number 7626
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 7626 SUBJECT: GRB 080413B: Faulkes Telescope South optical afterglow observations DATE: 08/04/16 17:48:34 GMT FROM: Andreja Gomboc at LT,ARI,Liverpool JMU A. Gomboc (Ljubljana), C. Guidorzi (U. Bicocca/INAF-OAB), A. Melandri, I.A. Steele, C.G. Mundell, D.F. Bersier, M.F. Bode, M.J. Burgdorf, S.N. Fraser, S. Kobayashi, C.J. Mottram, R.J. Smith (Liverpool JMU), P. O'Brien, N. Bannister, N. Tanvir (U. Leicester) report on behalf of larger GRB collaboration: The 2-m Faulkes Telescope South observed the field of GRB 080413B (trigger=309111, Stamatikos et al. GCN 7598) starting 8.7-hr after the trigger time. We detect the optical afterglow (Stamatikos et al. GCN 7598, Kruehler et al. GCN 7599, Antonelli et al. GCN 7600) and measure the following magnitudes: Filter T_mid(hr) Exposure(s) Mag ---------------------------------------------------------------------- R 8.74 30 19.00 +/- 0.15 I 8.90 640 18.91 +/- 0.05 I 9.20 1080 19.15 +/- 0.05 I 9.54 1080 19.22 +/- 0.06 ---------------------------------------------------------------------- Magnitudes were calibrated with respect to USNOB1 R2 and I.
GCN 7629 table
GRB_name GRB080413B
GCN_number 7629
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 7629 SUBJECT: GRB 080413B: Rapid PROMPT Observations DATE: 08/04/17 17:02:01 GMT FROM: Thomas Summers Brennan at UNC/GRB Group T. Brennan, D. Reichart, M. Nysewander, A. LaCluyze, K. Ivarsen, J. A. Crain, M. Schubel, A. Foster, J. Haislip, J. Styblova, and A. Trotter report: Skynet observed the localization of GRB 080413B (Stamatikos et al., GCN 7598) with four of the 16" PROMPT telescopes at CTIO beginning 27 seconds after the trigger (10 seconds after notification) in UBVRz' We detect the afterglow (Stamatikos et al., GCN 7598) in BVRz'. At 42 seconds after the burst we measure B ~ 15.7 mag (calibrated to 2 USNO B1 stars), at 55 seconds we measure V ~ 15.4 mag (calibrated to 2 USNO B1 stars), and at 87 seconds we measure R ~ 15.4 mag (calibrated to 2 NOMAD stars).