This is a record of posts to the AAVSO GRB Discussion Group about GRB 080822 ----------------- Date: Fri, 22 Aug 2008 09:14:20 -0400 Message-Id: <200808221314.m7MDEKNn009967(emailaddressremoved)> To: aavso-hen(emailaddressremoved) From: grb(emailaddressremoved) Subject: [AAVSO-HEN] GRB 080822: Swift detection of a short burst X-BeenThere: aavso-hen(emailaddressremoved) X-Mailman-Version: 2.1.9 Precedence: list List-Id: AAVSO High Energy Network List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: aavso-hen-bounces(emailaddressremoved) Errors-To: aavso-hen-bounces(emailaddressremoved) The following is a GCN Circular circulated via the AAVSO network. For an archive and more information on circulars visit: http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html TITLE: GCN CIRCULAR NUMBER: 8112 SUBJECT: GRB 080822: Swift detection of a short burst DATE: 08/08/22 13:08:50 GMT FROM: Scott Barthelmy at NASA/GSFC S. T. Holland (CRESST/USRA/GSFC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), D. N. Burrows (PSU), J. R. Cummings (NASA/UMBC), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), O. Godet (U Leicester), C. Guidorzi (INAF-OAB), J. A. Kennea (PSU), V. Mangano (INAF-IASFPA), J. Mao (INAF-OAB), F. E. Marshall (NASA/GSFC), P. T. O'Brien (U Leicester), J. P. Osborne (U Leicester), C. Pagani (PSU), K. L. Page (U Leicester), D. M. Palmer (LANL), M. Perri (ASDC), T. Sakamoto (NASA/UMBC), B. Sbarufatti (INAF-IASFPA), R. L. C. Starling (U Leicester), G. Stratta (ASDC) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team: At 12:41:59 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 080822 (trigger=321174). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 75.270, +45.272 which is RA(J2000) = 05h 01m 05s Dec(J2000) = +45d 16' 20" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single spike with a duration of less than 128 msec. The peak count rate was ~10000 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 12:43:16.3 UT, 77.1 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 75.27800, 45.27623 which is equivalent to: RA(J2000) = 05h 01m 6.72s Dec(J2000) = +45d 16' 34.4" with an uncertainty of 2.6 arcseconds (radius, 90% containment). This location is 25 arcseconds from the BAT onboard position, within the BAT error circle. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (5.22e+21 cm^-2, Kalberla et al. 2005), with an excess column of 3.6 (+3.64/-2.95) x 10^21 cm^-2 (90% confidence). UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 83 seconds after the BAT trigger. No afterglow candidate is apparent in the initial data products. The TDRSS source list covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) = 1.29 mag. We note that the XRT position is 10.8 arcsec from the catalog position of the ROSAT source 2RXP J050107.7+451637. Burst Advocate for this burst is S. T. Holland (sholland 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.) _______________________________________________ Aavso-hen mailing list Aavso-hen(emailaddressremoved) To change options or unsubscribe, goto http://www.aavso.org/mailman/listinfo/aavso-hen Date: Fri, 22 Aug 2008 09:31:11 -0400 Message-Id: <200808221331.m7MDVBvQ013115(emailaddressremoved)> To: aavso-hen(emailaddressremoved) From: grb(emailaddressremoved) Subject: [AAVSO-HEN] New Soft Gamma Repeater 0501+4516 was GRB 080822 X-BeenThere: aavso-hen(emailaddressremoved) X-Mailman-Version: 2.1.9 Precedence: list List-Id: AAVSO High Energy Network List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: aavso-hen-bounces(emailaddressremoved) Errors-To: aavso-hen-bounces(emailaddressremoved) The following is a GCN Circular circulated via the AAVSO network. For an archive and more information on circulars visit: http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html TITLE: GCN CIRCULAR NUMBER: 8113 SUBJECT: New Soft Gamma Repeater 0501+4516 was GRB 080822 DATE: 08/08/22 13:30:44 GMT FROM: Scott Barthelmy at NASA/GSFC S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), D. N. Burrows (PSU), J. R. Cummings (NASA/UMBC), N. Gehrels (NASA/GSFC), C. Guidorzi (INAF-OAB), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), J. Mao (INAF-OAB), F. E. Marshall (NASA/GSFC), C. Pagani (PSU), D. M. Palmer (LANL), M. Perri (ASDC), T. Sakamoto (NASA/UMBC), T. N. Ukwatta (GSFC/GWU) and L. Vetere (PSU) report on behalf of the Swift Team: At 13:12:52 UT, the Swift Burst Alert Telescope (BAT) triggered and located a second outburst from a new SGR source 0501+4516 (trigger=321177) which was previously reported as GRB 080822 (Holland et al, GCN Circ 8112). Swift was already looking at this location from the trigger on this source of ~30 min earlier. The BAT on-board calculated location is RA, Dec 75.265, +45.272, which is RA(J2000) = 05h 01m 04s Dec(J2000) = +45d 16' 20" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single spike with a duration of less than 128 msec. The peak count rate was ~17000 counts/sec (15-350 keV), at ~0 sec after the trigger. _______________________________________________ Aavso-hen mailing list Aavso-hen(emailaddressremoved) To change options or unsubscribe, goto http://www.aavso.org/mailman/listinfo/aavso-hen Date: Fri, 22 Aug 2008 13:49:56 -0400 Message-Id: <200808221749.m7MHnuOU026706(emailaddressremoved)> To: aavso-hen(emailaddressremoved) From: grb(emailaddressremoved) Subject: [AAVSO-HEN] GRB 080822 (SGR 0501+4516): archival optical observations X-BeenThere: aavso-hen(emailaddressremoved) X-Mailman-Version: 2.1.9 Precedence: list List-Id: AAVSO High Energy Network List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: aavso-hen-bounces(emailaddressremoved) Errors-To: aavso-hen-bounces(emailaddressremoved) The following is a GCN Circular circulated via the AAVSO network. For an archive and more information on circulars visit: http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html TITLE: GCN CIRCULAR NUMBER: 8114 SUBJECT: GRB 080822 (SGR 0501+4516): archival optical observations DATE: 08/08/22 17:49:29 GMT FROM: Denis Denissenko at IKI, Moscow D. V. Denisenko (Space Research Institute, Moscow, Russia) reports: Analysis of the Palomar Observatory Sky Survey plates available at http://archive.stsci.edu/cgi-bin/dss_plate_finder has revealed a variable object at the following position: RA (J2000.0) = 05 01 06.47 Dec (J2000.0) = +45 16 28.0 with an uncertainty of 0.2". This is 7" from the XRT position of GRB 080822 reported by Holland et al. (GCN 8112), thus formally outside the reported 90% error circle with the radius of 2.6". The above mentioned star is present in USNO-B1.0 catalogue as USNO-B1 1352-0128683 (RA = 05 01 06.42, Dec = +45 16 27.6) with the following magnitudes: B1=19.11, R1=15.99, B2=17.74, R2=15.97, I=16.52. Animation of two Blue and two Red plates, as well as color-combined (BRIR) images covering 101"x101" area around the variable star are available at . It should be also noted that the variable object is located 16" from the ROSAT source 1RXS J050107.9+451631 (catalog position error 13") with the hardness ratios HR1=0.96+/-0.08, HR2=1.00+/-0.12. These values are typical for X-ray binaries, including X-ray transients. Thus, the variable star is most likely associated with the ROSAT source. The optical spectroscopy of this star is encouraged. Also the follow-up X-ray observations of SGR 0501+4846 are required to reveal its true nature, improve the position accuracy and check the possible identification. This message can be cited. _______________________________________________ Aavso-hen mailing list Aavso-hen(emailaddressremoved) To change options or unsubscribe, goto http://www.aavso.org/mailman/listinfo/aavso-hen Date: Fri, 22 Aug 2008 17:28:15 -0400 Message-Id: <200808222128.m7MLSFgM002871(emailaddressremoved)> To: aavso-hen(emailaddressremoved) From: grb(emailaddressremoved) Subject: [AAVSO-HEN] GRB 080822: Swift detection of a burst X-BeenThere: aavso-hen(emailaddressremoved) X-Mailman-Version: 2.1.9 Precedence: list List-Id: AAVSO High Energy Network List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: aavso-hen-bounces(emailaddressremoved) Errors-To: aavso-hen-bounces(emailaddressremoved) The following is a GCN Circular circulated via the AAVSO network. For an archive and more information on circulars visit: http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html TITLE: GCN CIRCULAR NUMBER: 8117 SUBJECT: GRB 080822: Swift detection of a burst DATE: 08/08/22 21:27:55 GMT FROM: Scott Barthelmy at NASA/GSFC S. T. Holland (CRESST/USRA/GSFC), S. D. Barthelmy (GSFC), J. R. Cummings (NASA/UMBC), V. Mangano (INAF-IASFPA), F. E. Marshall (NASA/GSFC), C. Pagani (PSU), D. M. Palmer (LANL), M. Perri (ASDC), B. Preger (ASDC), R. L. C. Starling (U Leicester) and G. Stratta (ASDC) report on behalf of the Swift Team: At 21:02:52 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 080822 (trigger=321376). Swift did not slew to this burst because of the Moon observing constraint. It will come out of Moon constraint early 26 Aug 08 UT. The BAT on-board calculated location is RA, Dec 63.495, +25.743, which is RA(J2000) = 04h 13m 59s Dec(J2000) = +25d 44' 34" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT TDRSS light curve does not show anything significant which is typical for an image trigger. Burst Advocate for this burst is S. T. Holland (sholland 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.) _______________________________________________ Aavso-hen mailing list Aavso-hen(emailaddressremoved) To change options or unsubscribe, goto http://www.aavso.org/mailman/listinfo/aavso-hen Date: Sat, 23 Aug 2008 06:01:58 -0400 Message-Id: <200808231001.m7NA1wir000433(emailaddressremoved)> To: aavso-hen(emailaddressremoved) From: grb(emailaddressremoved) Subject: [AAVSO-HEN] New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection X-BeenThere: aavso-hen(emailaddressremoved) X-Mailman-Version: 2.1.9 Precedence: list List-Id: AAVSO High Energy Network List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: aavso-hen-bounces(emailaddressremoved) Errors-To: aavso-hen-bounces(emailaddressremoved) The following is a GCN Circular circulated via the AAVSO network. For an archive and more information on circulars visit: http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html TITLE: GCN CIRCULAR NUMBER: 8122 SUBJECT: New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection DATE: 08/08/23 10:01:50 GMT FROM: Andreas von Kienlin at MPE Andreas von Kienlin (MPE), N.P. Bhat (UAH), E. Bissaldi (MPE), M.S. Briggs (UAH), V. Connaughton (UAH), R. Diehl (MPE), G.J. Fishman (NASA/MSFC), L. Gibby (NASA/MSFC), J. Greiner (MPE), A.S. Hoover (LANL), A.J. van der Horst (NASA/ORAU), R.M. Kippen (LANL), C. Kouveliotou (NASA/MSFC), G.G. Lichti (MPE), C.A. Meegan (NASA/MSFC), S. McBreen (MPE), W.S. Paciesas (UAH), R.D. Preece (UAH), H. Steinle (MPE), M.S. Wallace (LANL), and C.A. Wilson-Hodge (NASA/MSFC)report: "At 12:41:59 UT on 2008 Aug 22, the GLAST Burst Monitor (GBM) triggered on the new Soft Gamma Repeater 0501+4516 (GRB 080822) (GBM 080822.529 / trigger 241101720), reported by SWIFT (Holland et al., GCN Circ. 8112, Barthelmy et al, GCN Circ. 8113 and GCN Circ. 8119). The on-ground calculated location, using the GBM trigger data, is RA = 86.2, Dec = +43.5 (J2000 degrees),(equivalent to J2000 05h 45m, +43d 30'), with an uncertainty of 3.3 degrees (radius, 1-sigma containment, statistical only). The true location error is 8.0 degrees for this soft, short event. This event has a duration of about 80 ms. The spectrum in the 10 keV to 100 keV energy band is well fit by a power law function with an index of -1.6 +/-0.1. The high temperature for an optically thin thermal bremsstrahlung (OTTB) fit is: 71 +/-13 keV. These results are consistent with the trigger clearly being seen to 100 keV. The spectral analysis results presented above are preliminary." _______________________________________________ Aavso-hen mailing list Aavso-hen(emailaddressremoved) To change options or unsubscribe, goto http://www.aavso.org/mailman/listinfo/aavso-hen Date: Sat, 23 Aug 2008 07:10:01 -0400 Message-Id: <200808231110.m7NBA1RD015575(emailaddressremoved)> To: aavso-hen(emailaddressremoved) From: grb(emailaddressremoved) Subject: [AAVSO-HEN] GRB 080822B: MASTER optical observation X-BeenThere: aavso-hen(emailaddressremoved) X-Mailman-Version: 2.1.9 Precedence: list List-Id: AAVSO High Energy Network List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: aavso-hen-bounces(emailaddressremoved) Errors-To: aavso-hen-bounces(emailaddressremoved) The following is a GCN Circular circulated via the AAVSO network. For an archive and more information on circulars visit: http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html TITLE: GCN CIRCULAR NUMBER: 8123 SUBJECT: GRB 080822B: MASTER optical observation DATE: 08/08/23 11:08:44 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs MASTER-Net Team: D.Kuvshinov, V. Lipunov, V.Kornilov, E.Gorbovskoy, A.Belinski, N.Shatskiy, N.Tyurina, Sternberg Astronomical Institute, Moscow Union 'Optic' A. Tlatov, I.Golubov Kislovodsk Solar Station of the Pulkovo observatory V.Krushinski, I.Zalognikh Ural State University, Kourovka S.Yazev, K.Ivanov Irkutsk State University MASTER robotic Net (Moscow region, http://observ.pereplet.ru) responded to GRB080822B (Holland et al., GCN Circ 8117) by hand due to internet problem at the Moscow Region Site. The first image was started at 2008-08-22 21:21:35 UT, 18m 43s after the GRB time. The unfiltered image is calibrated relative to USNO A2.0 (0.8 R + 0.2 B). The robot did not find OT-candidate in error box. T-Tgrb Mean Time Exposition Limit Coadd? 1123 s 1138 s 30 s 17.0 no 1123s 1692 s 25x30 s 18.8 yes The message can be cited. mailto: lipunov(emailaddressremoved) _______________________________________________ Aavso-hen mailing list Aavso-hen(emailaddressremoved) To change options or unsubscribe, goto http://www.aavso.org/mailman/listinfo/aavso-hen Date: Sun, 24 Aug 2008 17:02:53 -0400 Message-Id: <200808242102.m7OL2raQ007147(emailaddressremoved)> To: aavso-hen(emailaddressremoved) From: grb(emailaddressremoved) Subject: [AAVSO-HEN] GRB 080822B, Swift-BAT refined analysis X-BeenThere: aavso-hen(emailaddressremoved) X-Mailman-Version: 2.1.9 Precedence: list List-Id: AAVSO High Energy Network List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: aavso-hen-bounces(emailaddressremoved) Errors-To: aavso-hen-bounces(emailaddressremoved) The following is a GCN Circular circulated via the AAVSO network. For an archive and more information on circulars visit: http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html TITLE: GCN CIRCULAR NUMBER: 8128 SUBJECT: GRB 080822B, Swift-BAT refined analysis DATE: 08/08/24 21:02:00 GMT FROM: Scott Barthelmy at NASA/GSFC G. Sato (ISAS), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), S. T. Holland (CRESST/USRA/GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), K. McLean (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-239 to T+903 sec from the recent telemetry downlink, we report further analysis of BAT GRB 080822B (trigger #321376) (Holland, et al., GCN Circ. 8117). The BAT ground-calculated position is RA, Dec = 63.560, 25.760 deg, which is RA(J2000) = 04h 14m 14.5s Dec(J2000) = +25d 45' 35.5" with an uncertainty of 3.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 82%. The mask-weighted light curve shows weak emission starting around T-50 sec and ending around T+70 sec. T90 (15-350 keV) is 64 +- 20 sec (estimated error including systematics). The time-averaged spectrum from T+0.0 to T+64.0 sec is fit by a power law. This fit gives a photon index 2.54 +- 0.5. (chi squared 76.5 for 59 d.o.f.). For this model the total fluence in the 15-150 keV band is 1.7 +- 0.6 x 10^-07 erg/cm2 and the 1-sec peak flux measured from T+0.00 sec in the 15-150 keV band is 0.06 +- 0.02 ph/cm2/sec. All the quoted errors are at the 90% confidence level. We note that this is a weak detection for BAT and that we can not rule out a non-burst explanation for this trigger. _______________________________________________ Aavso-hen mailing list Aavso-hen(emailaddressremoved) To change options or unsubscribe, goto http://www.aavso.org/mailman/listinfo/aavso-hen