//////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2381 SUBJECT: GRB 030913: Optical limit at RIKEN DATE: 03/09/13 19:36:24 GMT FROM: Ken ichi Torii at RIKEN K. Torii (RIKEN) reports: "A part of the WXM error region of GRB 030913 (HETE trigger 2849) was observed by the Automated Response Telescope at RIKEN (0.25-m f/6.8 reflector equipped with unfiltered CCD AP6E). The observation started at 2003 September 13, 17:08:24 UT (87 s after trigger), and 40 s integration was repeated. In a stacked frame (12 x 40 s), no new object brighter than about 14.5 mag (USNO A2.0 red) is identified within the central 30x30 arcminutes area of the WXM position (Seq_Num 2). Further analysis is in progress." //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2383 SUBJECT: GRB030913 (=H2849): A GRB Possibly Localized by HETE DATE: 03/09/16 00:09:17 GMT FROM: Roland Vanderspek at MIT GRB030913 (=H2849): A GRB Possibly Localized by HETE M. Suzuki, C. Graziani, J. Villasenor, G. Crew, R. Vanderspek, M. Galassi, G. Ricker, D. Lamb, N. Kawai, and S. Woosley on behalf of the HETE Science Team; G. Prigozhin, J. Doty, A. Dullighan, N. Butler, T. Cline, J.G. Jernigan, G. Azzibrouck, J. Braga, R. Manchanda, and G. Pizzichini, on behalf of the HETE Operations and HETE Optical-SXC Teams; Y. Shirasaki, M. Matsuoka, T. Tamagawa, T. Sakamoto, A. Yoshida, K. Torii, Y. Nakagawa, D. Takahashi, R. Satoh, Y. Urata, E. Fenimore, and T. Donaghy, on behalf of the HETE WXM Team; J-L Atteia, C. Barraud, M. Boer, J-F Olive, J-P Dezalay, and K. Hurley on behalf of the HETE FREGATE Team; write: At 17:06:57.52 UTC (61617.5 s UT) on 13 Sep 2002, the HETE FREGATE, WXM, and SXC instruments detected event H2849, a relatively short GRB. The WXM flight localization was reported in a GCN Position Notice at 17:07:35 UT, 37 sec after the burst. The attitude of the spacecraft experienced a brief period of oscillations at just the time of GRB030913, which degraded the flight Y-detector localization and prevented us from confirming the flight localization to a high level of confidence in initial ground analyses. For this reason, the flight localization was retracted in a GCN Notice sent at 21:18 on 13 Sep 2002. Further analyses show that it is possible that the flight localization was indeed correct. If you have observed the flight localization, we encourage you to examine it for the afterglow, in case it is correct. The correct Y localization may be recoverable. The WXM flight localization SNR was 3.0 in the X-detector and 2.2 in the Y-detector. The WXM flight localization can be expressed as a 90% confidence circle that is 30 arcminutes in radius and is centered at WXM-Ground: RA = +20h 58m 02s, Dec = -02d 12' 32" (J2000). In the FREGATE 8-40 keV band, 8-80 keV band, and 30-400 keV band, the burst had a duration of ~6 seconds (T90). The burst significance was 12 sigma in the 30-400 keV band, 6 sigma in the WXM 2-25 keV band. Based on preliminatry spectral fits, the 30-400 keV fluence is roughly 6e-7 erg/cm2 and the 7-30 keV fluence is roughly 8e-8 erg/cm2. Further information (including a light curve) for GRB030913 is provided at the following URL: http://space.mit.edu/HETE/Bursts/GRB030913 This message is citable. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2386 SUBJECT: GRB030913 (=H2849): TAROT Observations DATE: 03/09/17 17:39:12 GMT FROM: Michel Boer at CESR-CNRS Alain Klotz, Michel Boer (CESR/CNRS/UPS) and Jean-Luc Atteia (LAT/OMP/UPS), on behalf of the TAROT team report: Following the GCN notices about GRB 030913, and GCNC #2383, The automated TAROT telescope took several images of the possible location of the source of GRB 030913. The images were taken between 20:33 and 20:44 UT on Sept., 13, 2003. No new object is present on the 2 deg. x 2deg. image centered on the GCN notice positon. The Moon is relatively close to the source position (72deg.), hence the limit we could obtain on the possible source magnitude is only R = 17.2 This message is citable. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2388 SUBJECT: GRB030913 (=H2849): Confirmation of the Flight Localization DATE: 03/09/18 01:04:21 GMT FROM: Roland Vanderspek at MIT GRB030913 (=H2849): Confirmation of the Flight Localization T. Donaghy, M. Suzuki, C. Graziani, D. Lamb, G. Ricker, N. Kawai, and S. Woosley on behalf of the HETE Science Team; G. Prigozhin, J. Doty, A. Dullighan, N. Butler, J. Villasenor, G. Crew, R. Vanderspek, T. Cline, J.G. Jernigan, G. Azzibrouck, J. Braga, R. Manchanda, and G. Pizzichini, on behalf of the HETE Operations and HETE Optical-SXC Teams; Y. Shirasaki, M. Matsuoka, T. Tamagawa, T. Sakamoto, A. Yoshida, K. Torii, Y. Nakagawa, D. Takahashi, R. Satoh, Y. Urata, E. Fenimore, M. Galassi, on behalf of the HETE WXM Team; J-L Atteia, C. Barraud, M. Boer, J-F Olive, J-P Dezalay, and K. Hurley on behalf of the HETE FREGATE Team; After extensive ground analysis of the WXM data for GRB030913 (=H2849), we have succeeded in localizing this burst. The WXM localization based on ground analysis can be expressed as a 90% confidence circle that is 12 arcminutes in radius and is centered at WXM-Ground: RA = +20h 58m 07.4s, Dec = -02d 21' 54" (J2000). GRB030913 was too faint to be localized by the SXC. The WXM ground localization confirms the flight localization reported in a GCN Position Notice on 2003 13 Sep at 17:07:35 UT, 37 sec after the burst and in GCN Circular 2383. Therefore, if you observed the flight localization of GRB030913, we strongly encourage you to examine your observations for the optical afterglow or to set limits on the brightness of any optical afterglow. Further information for GRB030913, including a light curve and a sky map, is provided at the following URL: http://space.mit.edu/HETE/Bursts/GRB030913 This message may be cited. [GCN OPS NOTE (18sep03): C.Graziani was added to the author list.] //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2390 SUBJECT: GRB030913: AAVSO optical observations DATE: 03/09/19 19:09:12 GMT FROM: Arto Oksanen at Nyrola Obs., Finland Arto Oksanen, Arne Henden, Cristovao Jacques, Andrea Tasselli, Odd Trondal, Michel Bonnardeau and Bruce Gary report on behalf of the AAVSO International High Energy Network: We have observed the GRB030913 (=H2849) error circle starting September 13, 2003 18:56 UT, less than 2 hours from the burst. The revised error circle (Donaghy et al., GCN 2388), was covered completly by several observers. The earlier larger error circle (M. Suzuki et al., GCN 2383) was covered by 90 percent in 7.9 hours. All images vere visually checked and most images were also checked by software against USNOA2.0 and USNOB1.0 catalogs to detect any optical transients. No new objects were found to the image limits. At 2.85 hrs after the burst, no afterglow was detected to R=18 (defined by images marked with stars on the following summary). Summary of all observations: total image center limiting from mid UT exposure RA (J200.0) DEC mag (R) burst(h) obs ----------------------------------------------------------------- 2003-09-13T18:56 20x10s 20 58 11 -02 17 15.5 1.83 OT 2003-09-13T19:13 6x60s 20 58 38 -01 57 18.0 2.10 AO * 2003-09-13T19:21 6x60s 20 57 15 -02 00 18.0 2.23 AO * 2003-09-13T19:29 6x60s 20 58 44 -02 12 18.0 2.37 AO * 2003-09-13T19:37 6x60s 20 57 23 -02 14 18.0 2.50 AO * 2003-09-13T19:49 6x60s 20 59 01 -02 20 18.0 2.70 AO * 2003-09-13T19:58 6x60s 20 57 39 -02 22 18.0 2.85 AO * 2003-09-13T20:53 6x60s 20 58 49 -01 53 17.5 3.77 AO 2003-09-13T21:05 6x60s 20 57 11 -02 00 17.5 3.97 AO 2003-09-13T21:15 6x60s 20 58 45 -02 12 17.5 4.13 AO 2003-09-13T21:23 6x60s 20 57 21 -02 14 17.0 4.27 AO 2003-09-13T21:30 42x60s 20 57 49 -02 22 18.0 4.39 AT 2003-09-13T21:31 6x60s 20 58 51 -02 26 17.5 4.40 AO 2003-09-13T21:39 6x60s 20 57 26 -02 29 17.5 4.53 AO 2003-09-13T22:26 10x45s 20 57 50 -02 14 18.0 5.32 CJ 2003-09-13T22:38 10x45s 20 57 49 -01 59 18.0 5.52 CJ 2003-09-13T22:50 10x45s 20 57 55 -02 32 18.0 5.72 CJ 2003-09-13T23:38 6x45s 20 56 32 -02 17 17.5 6.52 CJ 2003-09-13T23:50 4x45s 20 56 29 -02 01 17.5 6.43 CJ 2003-09-14T00:24 4x45s 20 59 14 -02 14 17.5 7.28 CJ 2003-09-16T02:40 18x60s 20 58 02 -02 12 20.3 57.53 BG 2003-09-17T03:55 8x900s 20 58 06 -02 35 22.7 82.82 AH ----------------------------------------------------------------- Observer details: AO: Arto Oksanen, Finland FOV: 24 x 16 arc min Equipment: 0.40m SCT f/5.0, ST8XE CCD, Rc-filter OT: Odd Trondal, Norway FOV: 20 x 15 arc min Equipment: 0.25 m f5.75, MX916 CCD, R-filter CJ: Cristovao Jacques, Brazil FOV: 25 x 17 arc min Equipment: 0.30m SCT f/3.0 , ST7E CCD, unfiltered BG: Bruce Gary, Arizona, U.S.A. FOV: 23 x 15 arc min Equipment: 0.35 m SCT, AO-7 stabilizer, ST-8XE CCD, unfiltered AT: Andrea Tasselli, UK FOV: 16 x 22 arc min Equipment: 0.15 m Maksutov Cassegrain f/7, MX716 CCD AH: Arne Henden, Arizona, U.S.A. FOV: 11 x 11 arcmin Equipment: 1.0m, CCD, R-filter The AAVSO International High Energy network is grateful for a generous grant from the Curry Foundation and to NASA for the financial support for the High Energy Workshops for Amateur Astronomers. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2391 SUBJECT: GRB 030913, optical candidate DATE: 03/09/20 02:12:37 GMT FROM: Alberto Castro-Tirado at LAEFF-INTA GRB 030913, possible optical counterpart ---------------------------------------- S. Guziy, A. de Ugarte Postigo, A.J. Castro-Tirado, J.Gorosabel (IAA-CSIC/STScI), P. Amado, Antonio Herrería (IAA-CSIC), Pilar Ruiz-Lapuente (Univ. Barcelona), Javier Méndez (ING, La Palma), J. M. Castro Cerón (STScI), and A. Zurita (ING, La Palma) report: "On Sep 18.04 UT (4.25 days after the burst) we imaged 80% of the HETE-II error box for GRB 030913 (Suzuki et al., GCNC 2383) with WHT at La Palma trough Johnson V filter. We detected an uncatalogued point like source of 20.9 +/- 0.1 at the following coordinates +/- 2": RA(J2000) = 20:58:46.5 DEC(J2000)= -02:20:59 On Sept 19.87 UT we imaged again the same field from the 1.5m telescope at Sierra Nevada Observatory (OSN, Granada) and detected an object at V mag = 23.6 +/- 0.5 on an equivalent position. Images of the field are posted on: http://www.iaa.es/~deugarte/GRBs/GRB030913/ Further images in R and B bands have been obtained that confirm the detection. Other observations are encouraged to confirm the relation of this object with GRB030913" This message may be quoted. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2392 SUBJECT: GRB030913, candidate afterglow observations DATE: 03/09/20 18:09:43 GMT FROM: Arne A. Henden at USNO/USRA A. Henden (USRA/USNO) and A. Oksanen (Nyrola Obs.) report on behalf of the AAVSO International High Energy Network: We have examined the early-time R-band images from Nyrola Observatory near the location of the proposed optical transient of Guziy et al. (GCN 2391). A stack of the f5.fit and f5b.fit composite images, giving an effective mid-exposure time of t_0 + 3.5hrs, does not convincingly show any object at the position shown in the Guziy et al. finding chart. A jpeg copy of the stack can be found at http://nyrola.jklsirius.fi/grb/grb030913/f5f5b.jpg Based on nearby USNO-B stars, we can place a limiting magnitude of R=19.5 for any object at this location. Combined with the V=20.9 at t_0 + 4.25day measure of Guziy et al., this would give an unrealistic decay slope for a typical GRB. Either this object is unrelated to the afterglow, or the afterglow increased in brightness after 4hrs. The AAVSO International High Energy network is grateful for a generous grant from the Curry Foundation and to NASA for the financial support for the High Energy Workshops for Amateur Astronomers. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2394 SUBJECT: GRB030913: OT's limit by MASTER DATE: 03/09/22 14:37:13 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, A. Krylov, V. Kornilov, G. Borisov, D. Kuvshinov, A. Belinski, I. Chilingarian, M. Kuznetsov, S. Potanin, V. Vitrischak, G. Antipov Sternberg Astronomical Institute, Alexsandr Krylov Observatory, Moscow report: We have observed the error box of GRB030913 (Suzuki et al., GCNC 2383) with MASTER system (GCN 2385, http://observ.pereplet.ru) equipped with new AP16E CCD during the first night after the GRB. 25 frames, obtained during first 4 hours after the burst, were combined to achieve the better magnitude limit (the first image was obtained 43 minutes after GRB time). No new sources were detected up to 17.5 unfiltered instrumental magnitude with S/N ratio of 3. The part of processed frame is available at http://observ.pereplet.ru/images/grb030913OT.gif. North is up, east is left. Position of possible OT, reported by Guziy et al. (GCN 2391) is marked on the image. No source brighter than 17.5 is seen there. This message is citable. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2396 SUBJECT: GRB030913: Subaru Optical Observations DATE: 03/09/23 02:01:38 GMT FROM: George Kosugi at Subaru Telescope G. Kosugi, H. Furusawa, Y. Komiyama, K. Sekiguchi, M. Iye, and N. Kawai on behalf of the Subaru GRB team report: We have observed the afterglow candidate of GRB 030913 (=H2849: GCN 2383, 2388) with the Subaru 8.2m telescope atop Mauna Kea on 2003 September 22.4 UT (9 days after the burst). A 600 sec V-band imaging observation was taken place with SuprimeCam (FOV: 24'x30') centered at the OT candidate reported by Guziy et al (GCN 2391). A galaxy (V = 23.0 +/- 0.2) was detected at the position of the OT candidate. We also detected a point-like source (V = 25.2 +/- 0.3) at about 1.5 arcsec north from the galaxy. Images of the field center are posted on: http://www.naoj.org/staff/george/Distribute/GRB030913/GRB030913.html This message may be cited.