//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7349 SUBJECT: GRB 080303A: ROTSE-III Optical Limits DATE: 08/03/03 09:38:13 GMT FROM: Brad Schaefer at LSU B. E. Schaefer (Louisiana State) and W. Rujopakarn (Steward), report on behalf of the ROTSE collaboration: ROTSE-IIIa, located at Siding Spring Observatory, Australia, responded to GRB 080303A (Swift trigger 304549), producing images beginning 8.4 s after the GCN notice time. An automated response took the first image at 09:10:55.3 UT, 20.0 s after the burst, and during the gamma-ray emission, under twilight conditions. We took 10 5-sec, 10 20-sec and 10 60-sec exposures. These unfiltered images are calibrated relative to USNO A2.0 (R). Imaging is on going. Comparison to the DSS (second epoch) reveals no new sources within the 3-sigma Swift/BAT error circle or the XRT error circle, for both single images and coadding into sets of 10; the field is not crowded. Individual images have limiting magnitudes ranging from 13.3-15.8, with the poor limits at the start due to the bright twilight that was rapidly fading. We set the following specific limits. start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd? -------------------------------------------------------------------- 09:10:55.4 09:11:00.4 5 13.3 20.1 N 09:10:55.4 09:13:06.9 131 14.1 20.1 Y 09:21:35.1 09:29:30.1 475 16.2 659.8 Y //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7350 SUBJECT: GRB 080303: REM NIR afterglow candidate DATE: 08/03/03 09:39:13 GMT FROM: Paolo D'Avanzo at INAF-OAB P. D'Avanzo, D. Fugazza, L.A. Antonelli, S. Covino, 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 080303 on March 03 09:13:30 UT (about 180 seconds after the burst). We detect an afterglow candidate inside the XRT error box down at the following coordinates (J2000): R.A.= 07:28:13.91 Dec.: -70:14:00.3 with an uncertainty of 0.4". The object has H~15.9. Further analysis is in progress. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7351 SUBJECT: GRB 080303: Swift detection of a burst with optical afterglow DATE: 08/03/03 09:41:42 GMT FROM: David Palmer at LANL T. Sakamoto (NASA/UMBC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), G. Cusumano (INAF-IASFPA), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), C. Gronwall (PSU), E. A. Hoversten (PSU), N. P. M. Kuin (MSSL), J. Mao (INAF-OAB), A. Moretti (INAF-OAB), P. T. O'Brien (U Leicester), S. R. Oates (UCL-MSSL), J. P. Osborne (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), D. Perez (U Leicester), P. Romano (INAF-IASFPA), M. Stamatikos (NASA/ORAU), R. L. C. Starling (U Leicester), G. Stratta (ASDC), G. Tagliaferri (INAF-OAB), E. Troja (U Leicester/INAF-IASFPa) and H. Ziaeepour (UCL-MSSL) report on behalf of the Swift Team: At 09:10:35 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 080303 (trigger=304549). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 112.073, -70.240 which is RA(J2000) = 07h 28m 18s Dec(J2000) = -70d 14' 23" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a FRED-like structure with a duration of about 30 sec. The peak count rate was ~2600 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 09:11:47.7 UT, 72.4 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source with an enhanced position: RA, Dec 112.05892, -70.23448 which is equivalent to: RA(J2000) = 07h 28m 14.14s Dec(J2000) = -70d 14' 04.1" with an uncertainty of 2.6 arcseconds (radius, 90% containment). This location is 26 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 consistent with the Galactic value of 1.26e+21 cm^-2 (Kalberla et al. 2005), so we cannot constrain the redshift at this time using the relation from Grupe et al. (2007). A summary of the promptly downlinked data is given at http://www.swift.ac.uk/sper/304549/. The initial flux in the 2.5 s image was 4.53e-10 erg cm^-2 s^-2 (0.2-10 keV). UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 80 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at RA(J2000) = 07:28:14.14 = 112.0589 DEC(J2000) = -70:14:01.7 = -70.2338 with a 1-sigma error radius of about 0.6 arc sec. This position is 2.4 arc sec. from the center of the XRT error circle. The estimated magnitude is 18.4 with a 1-sigma error of about 0.5 mag. A 400s V band image was taken beginning 186 s after the burst. The estimated magnitude is 18.3 with a 1 sigma error of 0.5 magnitudes. At 986 s after the burst the source is undetected in a 108 s V band exposure. The typical limiting magnitude is 18.0 magnitudes in an exposure of this length. No correction has been made for the expected extinction corresponding to E(B-V) of 0.19. Burst Advocate for this burst is T. Sakamoto (Taka.Sakamoto AT 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.) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7352 SUBJECT: GRB 080303 DATE: 08/03/03 11:01:48 GMT FROM: Alan Gilmore at U of Canterbury,Mt John Obs A.C. Gilmore and P.M. Kilmartin (University of Canterbury's Mt John Observatory report: We observed a fading source inside the XRT error box at coordinates (2000.0) R.A. = 07:28:14.10 Dec.: -70:14:01.4 Uncertainty ~0.5" in poor seeing. Unfiltered R magnitudes from comparison with USNO A2.0 stars U.T. R 09:28 18.1 09:40 18.5 09:48 19.0 10:02 19.2 10:13 19.4 10:28 19.9 Observations with Mt John's 1.0-metre f/8 McLellan reflector. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7353 SUBJECT: GRB 080303A: Faulkes Telescope South optical afterglow observations DATE: 08/03/03 11:19:42 GMT FROM: Andreja Gomboc at LT,ARI,Liverpool JMU A. Gomboc (U. Ljubljana), R.J. Smith, D.F. Bersier, S. Kobayashi, A. Melandri, A. Monfardini, C.G. Mundell, I.A. Steele (Liverpool JMU), C. Guidorzi (U. Bicocca & INAF-OAB), P. O'Brien, E. Rol, N. Bannister (Leicester) report: The 2-m Faulkes Telescope South (Siding Spring) robotically followed up GRB 080303A (SWIFT trigger 304549) starting 3.3 min after the GRB trigger time. We detect an optical afterglow candidate in R, B, and i' filters at the position consistent with the UVOT (Sakamoto et al, GCN 7351), REM (D'Avanzo et al., GCN 7350) and Mt. John (Gilmore & Kilmartin, GCN 7352) optical afterglow candidate. The magnitude of the source was R~17.4+-0.3 and 19.7+-0.3 at 8 min and 50 min after the trigger time, respectively. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7356 SUBJECT: GRB 080303: Enhanced Swift-XRT position DATE: 08/03/03 15:12:21 GMT FROM: Phil Evans at U of Leicester P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team. Using 1194 s of overlapping XRT Photon Counting mode and UVOT data for GRB 080303, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 112.05899, -70.23431 which is equivalent to: RA (J2000): 07h 28m 14.16s Dec (J2000): -70d 14' 03.5" with an uncertainty of 1.7 arcsec (radius, 90% confidence). This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401 http://www.swift.ac.uk/xrt_positions/Goad.pdf). This circular was automatically generated, and is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7357 SUBJECT: GRB080303: Swift XRT refined analysis DATE: 08/03/03 16:49:21 GMT FROM: Jirong Mao at INAF-OAB GRB080303: Swift XRT refined analysis J. Mao (INAF-OAB), A. Moretti (INAF-OAB), T. Sakamoto (NASA/UMBC), C. Guidorzi (Univ. Bicocca & INAF-OAB) report on behalf of the Swift-XRT team: We have analysed the Swift-XRT data obtained for BAT GRB 080303 (trigger #304549, Sakamoto, et al., GCN Circ. 7351). The data consist of 105 s in Windowed Timing (WT) mode, starting 80 s after the BAT trigger and 206 s in Photon Counting (PC) mode. The UVOT-enhanced XRT position was given in Evans et al. (GCN Circ. 7356). The light-curve shows a simple power-law with a slope of alpha=1.65 ± 0.05. The spectrum formed from all the WT data can be modeled with a power-law of photon index Gamma = 1.88 ± 0.12, with an absorbing column of NH = (1.32 ± 0.03)e21 cm^-2 (in excess with respect to the Galactic value of 8.97e20 cm^-2). The spectrum formed from the PC data can be modeled with a power-law of photon index Gamma = 1.81 ± 0.17, with an absorbing column of NH = (5.72 ± 4.77)e20 cm^-2. If the light-curve continues to decay with a slope of 1.65, the afterglow at 24 hour will be with an expected count rate of 1.5e-4 count s^-1. This corresponds to an observed (unabsorbed) flux of 7E-15(9e-15) erg cm-2 s-1. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7358 SUBJECT: GRB 080303: Rapid PROMPT Detections DATE: 08/03/03 22:16:57 GMT FROM: Mark Schubel at UNC/PROMPT M. Schubel, T. Brennan, D. Reichart, M. Nysewander, A. LaCluyze, K. Ivarsen, J. A. Crain, A. Foster, J. Haislip, J. Styblova, and A. Trotter report: Skynet observed the localization of GRB 080303 (Sakamoto et al., GCN 7351) with two of the 16" PROMPT telescopes at CTIO beginning 45 seconds after the burst (30 seconds after notification) in VRI. We detect the afterglow (D'Avanzo et al., GCN 7350) in R and I. At 182 seconds after the burst we measure I ~ 16.2 mag, and at 242 seconds we measure R ~ 17.0 mag (calibrated to 5 USNO B1 stars). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7359 SUBJECT: GRB 080303, Swift-BAT refined analysis DATE: 08/03/03 23:05:07 GMT FROM: Takanori Sakamoto at NASA/GSFC T. Sakamoto (GSFC/UMBC), S. D. Barthelmy (GSFC), 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), A. Parsons (GSFC), 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-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 080303 (trigger #304549) (Sakamoto, et al., GCN Circ. 7351). The BAT ground-calculated position is RA, Dec = 112.019, -70.231 deg which is RA(J2000) = 7h 28m 4.6s Dec(J2000) = -70d 13' 53" with an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 80%. The mask-weighted light curve shows a FRED-like peak T-1 sec, peaking at T+0.5 sec, and ending at T+20 sec. There is also an extended emission until T+~90 sec. T90 (15-350 keV) is 67 +- 20 sec (estimated error including systematics). The time-averaged spectrum from T-0.2 to T+73.2 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.54 +- 0.25. The fluence in the 15-150 keV band is 6.6 +- 1.0 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.06 sec in the 15-150 keV band is 1.4 +- 0.2 ph/cm2/sec. 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/304549/BA/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7360 SUBJECT: GRB 080303: Swift/UVOT follow-up of afterglow detection DATE: 08/03/03 23:18:28 GMT FROM: Alice Breeveld at MSSL-UCL A.A. Breeevld (MSSL/UCL) and T. Sakamoto (GSFC/UMBC) report on behalf of the Swift UVOT team: The Swift/UVOT observed the burst GRB080303 (Sakamoto et al. GCN circ 7351) starting with the finding chart exposure in white, 81s after the BAT trigger. The afterglow is detected at the enhanced XRT position (Evans et al. GCN circ 7356) in all filters except uvm2. In white it is detectable until at least 6600s after the trigger. The brightness increases until about 700s after the burst, then fades with an estimated temporal slope in the v filter of alpha= 0.9 The initial UVOT magnitudes (in the UVOT photometric system; Breeveld et al. GCN circ 6614) and 3 sigma upper limts from single exposures are as follows: Filter Tstart(s) Tstop(s) Exp(s) Mag error(mags) white 81 180 99.8 18.48 0.08 682 691 9.8 18.19 0.19 836 845 9.8 18.46 0.24 880 979 99.8 18.88 0.11 5195 5394 199.8 20.79 0.38 6632 6831 199.8 20.72 0.35 v 187 586 399.8 18.03 0.08 722 741 19.8 17.74 0.3 987 1095 108.1 19.06 0.3 5607 5806 199.8 19.76 0.38 b 667 676 9.8 18.59 0.36 821 830 9.7 >18.74 (UL) 4991 5190 199.8 >20.86 (UL) 6427 6626 199.8 20.26 0.27 u 642 661 19.8 18.23 0.32 797 816 19.8 17.99 0.26 4785 4984 199.8 19.4 0.22 6221 6420 199.8 20.33 0.41 uvw1 618 637 19.8 >18.1 (UL) 771 790 19.7 17.83 0.38 4581 4780 199.8 19.84 0.43 6016 6215 199.8 >20.18 (UL) uvm2 593 612 19.8 >17.58 (UL) 746 765 19.8 >17.61 (UL) 4375 4574 199.8 > 19.69 (UL) 5811 6010 199.8 >19.76 (UL) uvw2 698 717 19.8 >18.01 (UL) 851 870 19.8 17.82 0.37 5401 5600 199.7 19.76 0.33 6838 6875 37.6 >18.7 (UL) The values quoted above are not corrected for the expected Galactic extinction corresponding to a reddening of E(B-V)=0.192 mag in the direction of the burst (Schlegel et al. 1998). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 8440 SUBJECT: Radio observation of GRB 080303 with ATCA DATE: 08/10/29 08:03:29 GMT FROM: Aquib Moin at CIRA/ATNF Aquib Moin (Curtin Institute of Radio Astronomy / Australia Telescope National Facility), Steven Tingay (Curtin Institute of Radio Astronomy), Chris Phillips (Australia Telescope National Facility), Gregory Taylor (University of New Mexico), Mark Wieringa (Australia Telescope National Facility) and Ralph Martin (Perth Observatory) report: We observed the BAT refined position of the GRB 080303 (GCN 7359) at 4.8 and 8.456 GHz with the Australia Telescope Compact Array (ATCA) on May 31, 2008 between 04:09:05 UT and 14:19:35 UT. We did not detect a radio source at the BAT position of the GRB 080303 (GCN 7359). The radio flux density at the GRB position is -0.384 +/- 0.303 mJy at 4.8 GHz, and 0.078 +/- 0.250 mJy at 8.6 GHz (1-sigma). The Australia Telescope Compact Array (/ Parkes telescope / Mopra telescope / Long Baseline Array) is part of the Australia Telescope which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO. See field image at: http://astronomy.ivec.org/dokuwiki/doku.php/grb/grb_080303_field_image