GCN OPS NOTE: Please note that this compilation (made by computer automation) contains Circulars for both the "A" and "B" bursts on 040825. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2657 SUBJECT: GRB 040825: Optical observations DATE: 04/08/25 19:54:24 GMT FROM: Paul Price at IfA,UH P.A. Price (IfA, University of Hawaii) and R. McNaught (MSO) report: We have observed the error circle of GRB 040825 with the SSO 40-inch telescope. We obtained a single 300 sec exposure in R band at 2004 Aug 25.778 UT (2.3 hours after the GRB), covering the entire error circle apart from 1 arcmin on the extreme Eastern edge. The limiting magnitude of our image is R ~ 19.8 mag, from comparison with the USNO-A2.0 catalogue. Upon manual comparison with the DSS2 F plate, we do not find any afterglow candidate to the limiting magnitude of our image. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2658 SUBJECT: GRB040825B: Correction to GCN 2657 DATE: 04/08/25 20:10:28 GMT FROM: Paul Price at IfA,UH Subsequent to GCN 2657, P.A. Price (IfA) adds: Observations reported in GCN 2657 were of the localisation of GRB 040825B, i.e., HETE trigger 3510, centre 22:46:34 -2:24:27 J2000. Thanks to Arne Henden for pointing out the possible confusion. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2659 SUBJECT: MASTER: GRB040825b optical observation DATE: 04/08/25 20:26:52 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, A.Krylov, V.Kornilov, G.Borisov, D.Kuvshinov, A.Belinski, M.Kuznetsov, S.Potanin, G.Antipov, E.Gorbovskoy, N.Tyurina Sternberg Astronomical Institute, Alexsandr Krylov Observatory, Moscow At 4-th sec After HETE alert 3510 (WXM data refined since S/C_Last Notic) MASTER robotic telescope (http://observ.pereplet.ru) had automatically imaging the corresponding area of the sky (01h 43m after trigger time). On the first image on 200 mm camera with 30 sec exposure optical unfiltred limit is equal about 16.2. On image (UT 18h06m33s) optical limit is about 17.0. The comparison between these images with the USNO-A2 catalog does not reveal any new source. We have 30 unfiltered images of the error box (30s exposition, 40 x 50 arcmin) and 30 unfiltered images of the error box (60s exposition, 40 x 50 arcmin). The optical limit on sum of 30 fits (1 minute exposure) is about 19.5. FITS image are available at http://observ.pereplet.ru/images/GRB040825/ This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2660 SUBJECT: MASTER: GRB040825a optical observation DATE: 04/08/25 21:31:59 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, A.Krylov, V.Kornilov, G.Borisov, D.Kuvshinov, A.Belinski, M.Kuznetsov, S.Potanin, G.Antipov, E.Gorbovskoy, N.Tyurina Sternberg Astronomical Institute, Alexsandr Krylov Observatory, Moscow At 16.8h after HETE alert 11553 MASTER robotic telescope (http://observ.pereplet.ru) had imaging the corresponding area of the sky. We have 60 unfiltered images of the error box (60s exposition, 40 x 50 arcmin, 200 mm camera). The unfiltered optical limit on sum is about 20m. The visual comparison between these images with the DSS plate does not reveal any new source. Sum FITS image are available at http://observ.pereplet.ru/images/GRB040825a/ This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2661 SUBJECT: GRB 040825A: Optical observations. DATE: 04/08/25 22:05:54 GMT FROM: Javier Gorosabel at LAEFF-INTA, Madrid P. Tristram (Univ. of Canterbury, New Zealand), A. de Ugarte Postigo, J. Gorosabel, A.J. Castro-Tirado, M. Jelinek (IAA-CSIC, Granada, Spain), J.M. Castro Cerón (STScI, Baltimore, USA) Ph. Yock (Univ. of Auckland, New Zealand), report: "We have imaged the entire GRB 040825A error box provided by HETE-2 (trigger # 11553) with the 0.6-m telescope (+MOA camera) at Mt.John Observatory as follows: Date of Aug. Exp.Time Error box Lim. Mag. 2004 UT (s) coverage (%) (3 sigma) --------------------------------------------------- 25.4028-25.4346 4x300 ~75(North) R~21.1 25.5292-25.5426 2x300 ~25(South) R~20.7 --------------------------------------------------- Observations were performed with the MOA broad R-band filter (similar to Ic). Apart from several slow moving sources, visual comparison of the stacked image with the DSS-2 plates revealed no variable source." This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2662 SUBJECT: GRB040825B (=H3510): An XRF Localized in Real Time by HETE DATE: 04/08/26 03:25:35 GMT FROM: Roland Vanderspek at MIT GRB040825B (=H3510): An XRF Localized in Real Time by HETE Y. Urata, G. Ricker, J-L. Atteia, N. Kawai, D. Lamb, and S. Woosley, on behalf of the HETE Science Team; T. Donaghy, E. Fenimore, M. Galassi, C. Graziani, M. Matsuoka, Y. Nakagawa, T. Sakamoto, R. Sato, Y. Shirasaki, M. Suzuki, T. Tamagawa, T. Yamazaki, Y. Yamamoto, and A. Yoshida, on behalf of the HETE WXM Team; N. Butler, G. Crew, J. Doty, A. Dullighan, G. Prigozhin, R. Vanderspek, J. Villasenor, J. G. Jernigan, A. Levine, G. Azzibrouck, J. Braga, R. Manchanda, and G. Pizzichini, on behalf of the HETE Operations and HETE Optical-SXC Teams; C. Barraud, M. Boer, J-F Olive, J-P Dezalay, and K. Hurley, on behalf of the HETE FREGATE Team; report: At 16:21:37 UTC (58897 s UT) on 25 August 2004, the HETE FREGATE and WXM instruments detected event GRB040825B (=H3510), a long XRF. The burst triggered the WXM in the 2-30 keV energy band; the burst duration is roughly 80 seconds. A flight localization was automatically forwarded to the GCN 31 seconds after the trigger. The flight localization was a circle of 14' radius centered at RA = 22h 47m 22s, Dec = -02d 19' 05" (J2000) Subsequent analysis of the full data set allowed the burst error region to be reduced to a 160 sq. arcmin error box with the following coordinates, distributed by GCN Notice 1.8 hours after the trigger: RA = 22h 46m 38.9s, Dec = -02d 33m 40 RA = 22h 46m 01.9s, Dec = -02d 29m 17s RA = 22h 46m 28.6s, Dec = -02d 15m 14s RA = 22h 47m 05.5s, Dec = -02d 19m 41s Preliminary spectral analyses show the burst spectrum is well fit by a cutoff powerlaw model with an Epeak of 23 keV. The burst fluence is 1.3e-6 erg/cm2 in the 2-30 keV band, 6.3e-7 erg/cm2 in the 30-400 keV band; GRB040825B is therefore an XRF. Details of this burst can be found on the HETE web page at http://space.mit.edu/HETE/Bursts/GRB040825B. Further observations of this source are encouraged. This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2663 SUBJECT: GRB040825B: optical observations DATE: 04/08/26 04:38:55 GMT FROM: Adalberto Piccioni at Astronomy, Bologna U. A. Piccioni, C. Bartolini, A. Guarnieri, G. Greco (Bologna University), P. Ferrero (IASF-CNR, Bologna; Osservatorio e Universita' di Teramo), G. Pizzichini (IASF-CNR, Sezione di Bologna), F. Giovannelli (IASF-CNR, Sezione di Roma) and R. Gualandi (Osservatorio di Bologna) report: We observed the error box of GRB040825B (HETE trigger 3510, GCN 2662, Urata et al.) with the 152 cm Loiano Telescope and the BFOSC camera system on August 25, in non optimal sky conditions (seeing ~3.5 arcsec). The field has been divided in two subfields centered at the coordinates: 22hh 46mm 40ss; -2deg 21arcmin 42arcsec and approximately 22hh 46mm 38ss; -2deg 28arcmin, respectively. We got 5X300s images with Rc filter of each subfield at mean UT 25.96076 and 25.99013, respectively. The magnitude limit, estimated by aperture photometry, is approximately 19.5. By comparison of the coadded images with the corresponding DSS-2 field we do not find any obvious OT source in agreement with Price and McNaugth, (GCN 2657), whose limit was deeper and at an earlier epoch. The coadded images and the observation log will be posted into a public directory from where it will be possible to retrieve by sftp using the hostname: ermione.bo.astro.it, username: publicGRB, password: GRB_bo and directory: GRB040825B. [GCN OPS (26aug04): Removed the MIME encoding strings.] //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2664 SUBJECT: GRB040825A: optical observations DATE: 04/08/26 05:19:46 GMT FROM: Adalberto Piccioni at Astronomy, Bologna U. A. Piccioni, C. Bartolini, A. Guarnieri, G. Greco (Bologna University), P. Ferrero (IASF-CNR, Bologna; Osservatorio e Universita' di Teramo), G. Pizzichini (IASF-CNR, Sezione di Bologna), F. Giovannelli(IASF-CNR, Sezione di Roma) and R. Gualandi (Osservatorio di Bologna) report: We observed the error box of GRB040825A (HETE Ground Analysis, trigger 11553) with the 152 cm Loiano Telescope and the BFOSC camera system in non optimal sky conditions (seeing approximately 3.5 arcsec). We obtained 10X300s images with a filter Rc at UT mean = 26.03516. The magnitude limit, estimated by comparison with USNO A2 catalog, is approximately 19.5. By comparison of the coadded images with the corresponding DSS plate we did not find any obvious OT source, but in our field we detected 2 moving objects. The coadded images and the observation log will be posted in our public directory from where it will be possible to retrieve by sftp using hostname: ermione.bo.astro.it, username: publicGRB, password: GRB_bo, directory: GRB040825A. [GCN OPS (26aug04): Removed the MIME encoding strings.] //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2666 SUBJECT: GRB 040825A,optical observations DATE: 04/08/26 15:47:43 GMT FROM: Shouta Maeno at U.of Miyazaki S.maeno,E.Sonoda,Y.Matsuo, M.Yamauchi (University of Miyazaki) We have observed the WXM error box of GRB040825A(HETE trigger 11553) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki. Observed field of view is 43 arcmin centerd on (22h 59m 23s -11d 07' 44"). We have compared our images with the USNO A2.0 catalog. There is no new source brighter than 16.8 mag.in our observed field at 12:45:08 UT. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2668 SUBJECT: GRB040825A, BVRcIc field photometry DATE: 04/08/26 17:10:25 GMT FROM: Arne A. Henden at USNO/USRA A. Henden (USRA/USNO) reports on behalf of the USNO GRB team: We have acquired BVRcIc all-sky photometry for a 11x11 arcmin field centered on the HETE coordinates (trigger 11553) for GRB040825A with the USNOFS 1.0-m telescope on one photometric night. Stars brighter than V=13.5 are saturated and should be used with care. We have placed the photometric data on our anonymous ftp site: ftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb040825a.dat The astrometry in this file is based on linear plate solutions with respect to UCAC2. The external errors are less than 100mas. The estimated external photometric error is about 0.03mag and will be improved with additional calibration nights if an afterglow is discovered. As always, you should check the dates on the .dat file prior to final publication to get the latest photometry. There is a README file on the ftp directory to give you information about the procedures used to calibrate these fields. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2669 SUBJECT: GRB040825B, BVRcIc field photometry DATE: 04/08/26 17:26:33 GMT FROM: Arne A. Henden at USNO/USRA A. Henden (USRA/USNO) reports on behalf of the USNO GRB team: We have acquired BVRcIc all-sky photometry for a 11x11 arcmin field centered on the HETE coordinates (Urata et al., GCN 2662; trigger 3510) for GRB040825B with the USNOFS 1.0-m telescope on one photometric night. Stars brighter than V=13.5 are saturated and should be used with care. We have placed the photometric data on our anonymous ftp site: ftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb040825b.dat The astrometry in this file is based on linear plate solutions with respect to UCAC2. The external errors are less than 100mas. The estimated external photometric error is about 0.03mag and will be improved with additional calibration nights if an afterglow is discovered. As always, you should check the dates on the .dat file prior to final publication to get the latest photometry. There is a README file on the ftp directory to give you information about the procedures used to calibrate these fields. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2675 SUBJECT: GRB 040825B: Optical observations DATE: 04/08/27 19:23:10 GMT FROM: Javier Gorosabel at LAEFF-INTA, Madrid J. Gorosabel, A. de Ugarte Postigo, L.F. Miranda, A.J. Castro-Tirado, M. Jelinek (IAA-CSIC, Granada, Spain), C.B. Pereira (ON, Rio de Janeiro, Brasil), J.M. Castro Cerón (STScI, Baltimore, USA), J. Aceituno (CAHA, Spain), report: "We have observed the field of GRB 040825B (GCN 2662) with the 2.2m(+CAFOS) Calar Alto telescope on Aug 25.8443-25.8699 UT. The observations were carried out in the R-band (Texp = 4 x 300s) and cover the entire GRB error box. Visual comparison with the DSS-2 reveals no variable source brighter than R~21." This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2677 SUBJECT: GRB040825A: optical limit before GRB DATE: 04/08/27 20:02:21 GMT FROM: Grzegorz Wrochna at Soltan Inst.for Nuclear Studies M.Cwiok, L.Mankiewicz, K.Nawrocki, B.Pilecki, L.W.Piotrowski, G.Pojmanski, R.Salanski, M.Sokolowski, D.Szczygiel, G.Wrochna, on behalf of "Pi of the Sky / ASAS" collaboration The central part of HETE FOV containing GRB040825A error box was observed by "Pi of the Sky" apparatus (http://grb.fuw.edu.pl) at Las Campanas Observatory for the night of 2004.08.25 from 2:24 UT (1 h 6 min before the GRB) till 9:35 UT (6 h 4 min after the GRB). 10s exposures were taken continuously with 4s intervals by two CCD cameras. The single frame limiting magnitude was strongly varying, due to thin clouds covering the sky. No OT and no unknown objects have been observed within the GRB040825A error box. Preliminary limits for frames PRECEDING, CONTAINING and following the GRB are 10m, 10m, and 9.5m respectively. We are working on better limits for integrated frames. More details can be found at http://grb.fuw.edu.pl/pi/ot/grb040825a/ -- _____________________________________________________ | | | dr hab. Grzegorz Wrochna http://cern.ch/wrochna | | Soltan Institute for Nuclear Studies | | Hoza 69 e-mail: wrochna@fuw.edu.pl | | PL 00-681 Warsaw tel: +48 22 628 18 93 | | Poland fax: +48 22 621 28 04 | |_____________________________________________________| //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2686 SUBJECT: GRB040825A: Optical observations DATE: 04/09/01 11:30:49 GMT FROM: Brian Lindgren Jensen at U.of Copenhagen Brian L. Jensen (U. Copenhagen), Arnaud Cassan (IAP, Paris), Dijana Dominis (U. Potsdam), Jens Hjorth, Johan Fynbo (U. Copenhagen), Michael I. Andersen (AIP, Potsdam), Javier Gorosabel (IAA-CSIC, Granada) report: "We report optical observations, covering ~90% of the refined 7' error-circle (HETE#11553-2) of GRB040825A, taken with the Danish 1.54m telescope at La Silla (FoV=13.7'), as follows: Date midobs (UT) | t_b+ | filter:expt | seeing | 3sig limit ------------------------------------------------------------ Aug. 26.30, 2004 27.7h R:14x600s ~1.1" R~23.5 Aug. 26.31, 2004 27.9h V:12x600s ~1.4" V~23.3 Aug. 27.31, 2004 51.9h R:18x600s ~1.5" R~23.0 Aug. 28.28, 2004 75.2h I:13x300s ~2.1" I~21.0 Photometric calibration is based on Henden et al. (GCN#2668). Visual comparison of the three main epochs reveals no candidate optical afterglow down to R~23.0" [GCN OPS NOTE (02Sep04 11:15 UT): The second column (t_b+) of the table had a wrong offset in the original posting (should have been 12.8h larger). This archived copy of the circular has the corrected t_b+ values.]