//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 6708 SUBJECT: GRB 070805: Swift detection of a burst DATE: 07/08/05 20:08:02 GMT FROM: Scott Barthelmy at NASA/GSFC A. M. Parsons (GSFC), S. D. Barthelmy (GSFC), N. Gehrels (NASA/GSFC), J. A. Kennea (PSU), V. La Parola (INAF-IASFPA), C. B. Markwardt (CRESST/GSFC/UMD), D. M. Palmer (LANL), M. Stamatikos (NASA/ORAU), R. L. C. Starling (U Leicester), E. Troja (INAF-IASFPA), T. N. Ukwatta (GSFC/GWU), D. E. Vanden Berk (PSU), S. D. Vergani (DIAS-DCU) and H. Ziaeepour (UCL-MSSL) report on behalf of the Swift Team: At 19:55:45 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 070805 (trigger=287088). The BAT on-board calculated location is RA, Dec 245.043, -59.945 which is RA(J2000) = 16h 20m 10s Dec(J2000) = -59d 56' 40" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows two peaks, the first is ~5 sec in duration and the second peak is broader and weaker ending around T+40 sec. The peak count rate was ~500 counts/sec (15-350 keV), at ~2 sec after the trigger. Because of an Earth limb constraint, the spacecraft did not slew promptly to the BAT position, and so there are no immediate XRT or UVOT data products to analyze. The burst will come out of constraint at T+31 minutes. Burst Advocate for this burst is A. M. Parsons (parsons 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.) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 6709 SUBJECT: GRB 070805: Swift/UVOT initial analysis DATE: 07/08/05 21:19:21 GMT FROM: Daniel E. Vanden Berk at PSU/Swift D. E. Vanden Berk (PSU), P. Kuin (MSSL), F. E. Marshall (NASA/GSFC), and A. M. Parsons (GSFC) report on behalf of the Swift-UVOT team: UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 1977 seconds after the BAT trigger. No afterglow candidate has been found in the initial data products. The overlap of the sub-image and the BAT error circle is uncertain at this time. The 8'x8' region for the list of sources generated on-board covers 100% of the BAT error circle. Because of the density of catalogued stars, further analysis is required to report an upper limit for any afterglow in the region. No correction has been made for the extinction of E(B-V)=0.202. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 6710 SUBJECT: GRB 070805: Swift XRT initial analysis. DATE: 07/08/06 03:47:39 GMT FROM: Valentina La Parola at INAF-IASPA V. La Parola, J. Kennea, E. Troja, V. Mangano, B. Sbarufatti on behalf of the Swift team. We have analysed the first 2.3 ks of the XRT observation of GRB070805 (Parsons et al., GCN 6708). Due to Earth limb constraint the XRT began observing the GRB location 33 min after the trigger, at 20:28:48 UT. No sources are visible in this first orbit of data, with an upper limit to the unabsorbed flux of 2.4e-13 erg/s/cm2. We are waiting for more data for further analysis. This is an official product of the Swift-XRT team I.A.S.F. INAF Mailing System Outgoing mail is certified Virus Free. Checked by McAfee anti-virus system //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 6711 SUBJECT: GRB 070805, Swift-BAT refined analysis DATE: 07/08/06 03:47:45 GMT FROM: Scott Barthelmy at NASA/GSFC M. Stamatikos (GSFC/ORAU), L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), J. Tueller (GSFC), T. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-120 to T+182 sec from the recent telemetry downlink, we report further analysis of BAT GRB 070805 (trigger #287088) (Parsons, et al., GCN Circ. 6708). The BAT ground-calculated position is RA, Dec = 245.057, -59.957 deg, which is RA(J2000) = 16h 20m 13.8s Dec(J2000) = -59d 57' 26" with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 60%. The mask-weighted light curve shows two overlapping FRED-like peaks, the first starting at ~T_zero and the second ending at ~T+35 sec. We note that the spacecraft slewed to a pre-planned target at T+135 sec. During the slew the burst location left the BAT FOV at T+182 sec, and as such, we can not determine if there as any burst activity beyond T+182 sec. T90 (15-350 keV) is 31.0 +- 1.0 sec (estimated error including systematics). The time-averaged spectrum from T-0.6 to T+35.7 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.84 +- 0.20. The fluence in the 15-150 keV band is 7.2 +- 0.8 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+3.23 sec in the 15-150 keV band is 0.7 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 6712 SUBJECT: Swift/UVOT observations of GRB070805 DATE: 07/08/06 12:06:28 GMT FROM: Patricia Schady at MSSL/Swift P. Schady and A.M. Parsons (GSFC) report on behalf of the Swift UVOT team The Swift/UVOT observed the field of GRB070805 (trigger=287088) starting 33 minutes after the BAT trigger (Parsons et al. 2007, GCN Circ.6708). We do not find any new source in the UVOT observations within the BAT error circle or in the whole of the UVOT field of view, which we note is a very crowded field. The 5-sigma upper limits in the co-added frames are listed below: Filter Tmid Exposure Magnitude (s) (s) (5-sigma UL) white 3267 333 > 20.2 v 2825 274 > 18.5 b 3441 274 > 19.5 u 3287 274 > 19.2 uvw1 3133 274 > 19.0 uvm2 2979 274 > 18.8 uvw2 3384 452 > 19.4 where Tmid is the weighted mean team of the coadded exposure. The values quoted above are not corrected for the expected Galactic extinction corresponding to a reddening of E(B-V) = 0.202 mag in the direction of the burst (Schlegel et al. 1998). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 6716 SUBJECT: GRB070805 XRT and UVOT afterglow candidate DATE: 07/08/07 22:04:03 GMT FROM: Valentina La Parola at INAF-IASPA V. La Parola, P. Schady, F.E. Marshall, S. T. Holland and A. M. Parsons, E. Troja, J. Kennea report on behalf of the Swift team We have analysed the XRT and UVOT observations of GRB070805 (Parsons et al., GCN 6708). The XRT observed the BAT position twice, with 2.3 and 7.7 ksec exposure times. We find a faint source (estimated unabsorbed flux: 3.4e-13 erg/s/cm2) within the BAT error circle, at RA= 16 20 02.8 (245.01175) Dec= -59 57 34.8 (-59.959657) (4 arcsec error radius, 90% confidence) that is 82 arcsec from the BAT position (Stamatikos et al, GCN 6711) This source does not show any sign of decay, its count rate being consistent between the two observations. The source is too faint to allow for any detailed spectral or temporal analysis. A second, fainter source is detected only in the second observation, at RA= 16 20 16.8 (245.069937) Dec= -59 57 12.7 (-59.95352) (4.7 arcsec error radius, 90% confidence) The estimated unabsorbed flux is 1.13e-13 erg/s/cm2. At present, neither of these sources can be confidently associated with the GRB afterglow. On further inspection of the UVOT observations, an uncatalogued source is detected at the position of the first XRT source. This source was initially unidentified (GCN Circ. 6712) due to the density of the field and size of the BAT error circle. The source is detected in the white band filter at more than 3 sigma with an estimated magnitude of 20.1+/-0.2, and is marginally detected in the V, B and U filters. The refined UVOT coordinates of this source are RA = 16 20 03.11 (245.0131) Dec = -59 57 34.9 (-59.9597) with an uncertainty of 0.7 arcseconds. There is little evidence for variability in the limited data currently available. Observations are ongoing. I.A.S.F. INAF Mailing System Outgoing mail is certified Virus Free. Checked by McAfee anti-virus system //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 6763 SUBJECT: GRB 070805: UVOT afterglow candidate retraction DATE: 07/08/21 19:51:10 GMT FROM: Patricia Schady at MSSL/Swift P. Schady and A.M. Parsons report on behalf of the Swift UVOT team The Swift/UVOT re-observed the field of GRB070805 on 2007-08-07 at 14:36 UT, 1.8 days after the BAT trigger (GCN Circ. 6708). The uncatalogued source detected by UVOT in previous white band observations (GCN Circ. 6716) is detected and does not show any sign of decay. It is therefore unlikely that this source is the afterglow of GRB070805.