//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 9110 SUBJECT: GRB 090408: Swift detection of a burst DATE: 09/04/08 15:17:41 GMT FROM: Scott Barthelmy at NASA/GSFC M. C. Stroh (PSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), M. M. Chester (PSU), P. A. Evans (U Leicester), O. Godet (U Leicester), D. Grupe (PSU), C. Guidorzi (U Ferrara), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), F. E. Marshall (NASA/GSFC), P. T. O'Brien (U Leicester), J. P. Osborne (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), J. L. Racusin (PSU), P. Romano (INAF-IASFPA), B. Sbarufatti (INAF-IASFPA) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team: At 15:02:11 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 090408 (trigger=348720). Swift will execute a delayed slew to the burst. The BAT on-board calculated location is RA, Dec 231.618, +37.564, which is RA(J2000) = 15h 26m 28s Dec(J2000) = +37d 33' 51" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT TDRSS light curve shows nothing significant as is typical for an image trigger. Due to an observing constraint, Swift will not slew until T0+55 minutes. There will be no XRT or UVOT data until this time. Burst Advocate for this burst is M. C. Stroh (stroh AT astroh.org). 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.) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 9111 SUBJECT: GRB 090408B: MASTER II-Kourovka optical observations DATE: 09/04/08 18:33:14 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V.Krushinski, I.Zalognikh, T.Kopytova Ural State University, Kourovka E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov Sternberg Astronomical Institute, Moscow State University A. Tlatov, A.V. Parhomenko, Kislovodsk Solar Station of the Pulkovo Observatory K.Ivanov, S.Yazev, Irkutsk State University The MASTER II Wide Field Telescope located at Kourovka Observatory (Ural) (two telescopes with D=400 mm, FOW = 2x4 square degrees, 2x16 Mpx CCD on one NTM mount) has observed Swift error box (Stroh et al., GCN 9110) with 60s exposure started at 1h 27m after Trigger time (after sun set) simultaneously in two filters R and V. MASTER-II is the new site of the MASTER-Net (http://observ.pereplet.ru/). Actually, we observed from the city. Our images are calibrated relative to USNO B (R) & Tycho stars (V). The wether is not very good. We do not detect OT inside error box brighter ~17m (S/N=6). The reduction is continued. The message may be cited. mailto: lipunov@sai.msu.ru //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 9114 SUBJECT: GRB 090408: Xinglong TNT optical Upper Limit DATE: 09/04/09 05:06:27 GMT FROM: L.P. Xin at NAOC L.P. Xin, W.K. Zheng, Y.L. Qiu, J.Y. Wei, J. Wang, J.S. Deng, Y. Urata and J.Y. Hu on behalf of EAFON report: We have observed GRB 090408 (Stroh et al., GCN 9110) with Xinglong TNT telescope from Apr.8,16:27:30 (UT), 1.42 hour after the burst. After combined 18*300s R band images, no new source was found in our combined image. The 3 sigma upper limits derived from USNO-B1.0 R2 magnitude is R=21.1 mag at the mean time of 1.67 hour since the trigger. This message may be cited. For more information about Xinglong GRBs Follow-up observations, please visit the website: http://www.xinglong-naoc.org/grb/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 9115 SUBJECT: GRB090408, RIMOTS optical upper limits DATE: 09/04/09 09:40:27 GMT FROM: Kenta Kono at Miyazaki U K.Kono, E.Sonoda, N.Ohmori, H.hayasi, A.Daikyuji, Y.Nisioka, K.Noda, M.Yamauchi (University of Miyazaki) We have observed the field covering the error circle of GRB090408 (Swift trigger 348720, GCN 9110, M.C.Stroh et al.) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki. The observation was started 15:05:13 UT (2 min. after the Swift trigger), under cloudy condition. First analyzable image was obtained at 15:16:52 UT (14 min. after the Swift trigger). We have compared our data of 30 sec exposures with the USNO-A2.0 catalog, There is no new source at the reported position. (GCN 9110,M.C.Stroh et al.) the upper limits are as follows: -------------------------------------------------------------- Start(UT) End(UT) Num. of frames Limit (mag.) -------------------------------------------------------------- 15:16:52 15:17:22 1 13.5 15:16:52 15:33:25 14 16.5 --------------------------------------------------------------- //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 9120 SUBJECT: GRB090408 : TAOS optical observations DATE: 09/04/10 07:28:36 GMT FROM: Kuiyun Huang at ASIAA GRB090408 : TAOS optical observations S.K. King, K.Y. Huang, S.Y. Wang and the TAOS team The four 50cm TAOS telescopes observed GRB 090408 position (Stroh et al, GCN9110) at 91s after the burst. No new optical emission was detected in the BAT possition error range. The 3-sigma limiting magnitude, compared with USNOB red stars, are as follows: ------------------------------------------------------------------------------ Mean Dealy(s) Exposure time Limit mag. Telescope ------------------------------------------------------------------------------- 157 5s x15 15.2 TAOSB 221.5 1s x60 14.8 TAOSD -------------------------------------------------------------------------------- -- Lijin (Kuiyun) Huang Postdoctoral Fellow Institute of Astronomy & Astrophysics, Academia Sinica (ASIAA) Phone: 886-2-3365 2200 x728 //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 9121 SUBJECT: Konus-Wind and Konus-RF observations of GRB 090408b DATE: 09/04/10 14:40:32 GMT FROM: Dmitry Frederiks at Ioffe Institute S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P. Oleynik, M. Ulanov, and D. Svinkin on behalf of the Konus-Wind and Konus-RF teams, and T. Cline on behalf of the Konus-Wind team, report: The very bright long GRB 090408b triggered Konus-Wind at T0=71198.539 s UT (19:46:38.539), and Konus-RF instrument onboard CORONAS-PHOTON s/c at T0=71203.482 s UT (19:46:43.482). We have triangulated this burst to a preliminary Konus-Wind - Konus-RF annulus centered at RA(2000)=41.01, Dec(2000)=+14.92, whose radius is 11.6 ± 1.3 deg (3 sigma). The Konus-Wind and Konus-RF light curves of this GRB are available at http://www.ioffe.ru/LEA/GRBs/GRB090408_T71198/ They show a multipeaked structure with a duration of ~8 s. The burst demonstartes strong spectral evolution, as observed by Konus-RF a hard part of the burst emission (above 500 keV) consists of several relatively narrow peaks, while soft emission time profile is more smooth. No emission is seen above 2500 kev. The time-integrated spectrum of the most intense part of the event (measured by Konus-Wind from T0 to T0+5.632 s) can be fitted (in the 20 - 2500 keV range) by GRB (Band) model for which: the low-energy photon index alpha = -0.67(-0.04, +0.04), the high energy photon index beta = -2.68(-0.09, +0.08), the peak energy Ep = 344(-14, +13) keV (chi2 = 107/61 dof). The spectrum of the most intense peak (measured by Konus-Wind from T0+2.816 to T0+3.082 s) is well fitted (in the 20 - 2500 keV range) by GRB (Band) model for which: the low-energy photon index alpha = -0.49 +/-0.09, the high energy photon index beta = -2.94 (-0.28, +0.20), the peak energy Ep = (431 +/- 30) keV (chi2 = 54/61 dof). The burst had a fluence of (2.84 +/- 0.17)x10-4 erg/cm2, and a 16-ms peak flux measured from T0+2.912 s of 3.4(-0.8, +0.6)x10-4 erg/cm2/s (both in the 20 - 2500 keV energy range). Due to uncertainties in the burst incident angles the quoted values are preliminary. All the quoted errors are at the 90% confidence level. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 9125 SUBJECT: GRB 090408b: IPN Triangulation DATE: 09/04/12 10:22:03 GMT FROM: Dmitry Frederiks at Ioffe Institute S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin, and T. Cline on behalf of the Konus-Wind and Konus-RF teams, K. Hurley and T. Cline, on behalf of the Mars Odyssey and Konus GRB teams, I. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin, on behalf of the HEND-Odyssey GRB team, W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on behalf of the GRS-Odyssey GRB team, A. von Kienlin, G. Lichti, and A. Rau, and K. Hurley on behalf of the INTEGRAL SPI-ACS team, E. Costa, E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, I. Lapshov, F. Lazzarotto, L. Pacciani, M. Rapisarda, P. Soffitta, for the SuperAGILE team, G. Di Cocco, F. Fuschino, M. Galli, C. Labanti, M. Marisaldi, on behalf of the AGILE MCAL team report: Konus-Wind, Konus-RF, Mars-Odyssey (GRS and HEND), and INTEGRAL-SPI-ACS observed the intense GRB 090408b (Golenetskii et al., GCN 9121). It was also observed by AGILE-MCAL and SuperAGILE (outside the coded field of view). We have triangulated it to the following 3-sigma error box: ----------------------------------------------- RA(2000), deg Dec(2000), deg ----------------------------------------------- Center: 43.98 (02h 55m 56s) +26.61 (+26d 36' 36") Corners: 43.95 (02h 55m 48s) +27.59 (+27d 35' 24") 42.98 (02h 51m 55s) +27.78 (+27d 46' 48") 44.05 (02h 56m 12s) +25.64 (+25d 38' 24") 44.97 (02h 59m 53s) +25.49 (+25d 29' 24") ----------------------------------------------- The error box area is 1.48 sq. deg. This error box may be improved. IPN triangulation map is avalable at at http://www.ioffe.ru/LEA/GRBs/GRB090408_T71198/IPN -- //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 9188 SUBJECT: GRB 090408A: GAO 150cm telescope Optical Observation DATE: 09/04/22 10:47:58 GMT FROM: Kenzo Kinugasa at Gunma Astro. Obs/Japan K. Kinugasa, H. Takahashi, S. Honda, O. Hashimoto, H. Taguchi (Gunma Astronomical Observatory) report: The field of GRB 090408 (Stroh et al. GCN 9110) was observed with the 150 cm telescope of the Gunma Astronomical Observatory. Starting at 16:03 UT and 18.36 UT (1.03 and 2.58 hours after the trigger), Rc and Ic frames were acquired for sets of 5 x 3-min and 5 x 3-min exposures under a hazy sky condition. We did not detect any new point source within the BAT error circle to limiting magnitudes below relative to USNO-B1.0 R2 and I magnitudes. mid-UT exp band mag. ----------------------------------- 16:12:59 5x3min Rc > 20.1 16:34:40 5x3min Ic > 19.4 27:45:46 5x3min Rc > 20.3 28:15:37 5x3min Ic > 19.3 //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 9192 SUBJECT: GRB 090408A: Erratum in GCN 9188 DATE: 09/04/22 14:18:12 GMT FROM: Kenzo Kinugasa at Gunma Astro. Obs/Japan K.Kinugasa et al. (Gunma Astronomical Observatory) ; I made a typo in GCN 9188. We observed "GRB 090408A (Stroh et al. GCN 9110)" instead of "GRB 080408A" in subject. I apologize for my carelessness. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 9330 SUBJECT: GRB 090408: optical upper limit DATE: 09/05/09 20:55:42 GMT FROM: Alexei Pozanenko at IKI, Moscow D. Shakhovskoy, V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the Swift GRB 090408 (Swift trigger=348720; Stroh et al., GCN 9110) in R-filter on Apr. 8 with AZT-11 telescope of CrAO. We do not detect any new object within BAT erorr box (Stroh et al., GCN 9110) in a stacked image in R at ~ 3.7 hrs after burst onset. An upper limit photometry of combined images based on USNO B1.0 1275-0286482 RA(J2000)=15:26:27.78 Dec(J2000)= +37:33:46.2 R =17.55 is following: T0+ Filter, Exposure, mag., err. (d) (s) 0.1561 R 20x180 > 20.4 (3sigma)