//////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3623 SUBJECT: Swift/BAT detection of GRB 050716 DATE: 05/07/16 13:34:23 GMT FROM: Evert Rol at U.Leicester E. Rol, C. Hurkett, K. Page (U. Leicester), S. Barthelmy, L. Barbier, A. Parsons (GSFC), J. Cummings (NRC, GSFC), D. Palmer (LANL), D. Burrows, J. Kennea (PSU), K. McGowan (MSSL), N. Gehrels (GSFC), report for the Swift team: At 12:36:04 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 050716 (trigger=146227). The BAT on-board calculated location is RA,Dec 338.598d {+22h 34m 23s}, +38.696d {+38d 41' 46"} (J2000), with an uncertainty of 4 arcmin (radius, including estimated systematic uncertainty; 90% containment). The BAT light curve showed a multi-peak structure with a duration of at least 40 seconds. The 15-350 keV peak count rate was ~1300 counts/sec, measured by BAT at ~10 seconds after the trigger. The spacecraft slewed immediately and the XRT began observing the burst at 12:37:40 UT (96 seconds after the BAT trigger). The XRT found a bright, uncatalogued X-ray source. The on board calculated position is: RA: 22h 34m 20.4s (J2000), Dec: -38d 40' 56.7" (J2000). This position is 60.6 arcseconds from the BAT position. The estimated uncertainty is 6 arcseconds radius (90% containment). The Swift Ultra Violet/Optical Telescope (UVOT) observations began at 12:37:43 UT, 99 seconds after the BAT trigger. The first data taken after the spacecraft settled was a 100 sec exposure using the V filter with the midpoint of the observation at 149 sec after the BAT trigger. Based on comparisons to the DSS, we detect no new source at the XRT position. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3624 SUBJECT: GRB050716: Correction to sign in XRT coordinate DATE: 05/07/16 14:10:33 GMT FROM: Jamie A. Kennea at PSU/Swift-XRT J. Kennea, D. Burrows (PSU), E.Rol, C. Hurkett, K. Page (U. Leicester) and N. Gehrels (GSFC) report for the Swift/XRT Team: In GCN 3623 we reported an incorrect sign on the declination of the XRT position for GRB050716. The corrected position is: RA: 22h 34m 20.4s (J2000), Dec: +38d 40' 56.7" (J2000). With an estimated uncertainty of 6 arcseconds radius (90% containment). //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3625 SUBJECT: GRB050716: Faulkes North Telescope observation DATE: 05/07/16 14:40:22 GMT FROM: Cristiano Guidorzi at ARI,Liverpool JMU C. Guidorzi, A. Gomboc, A. Monfardini, I. A. Steele, C.J. Mottram, C.G. Mundell, R.J. Smith, D. Carter, M.F. Bode (Liverpool JMU), E. Rol, P. O'Brien, N. Bannister (Leicester) report: "The 2-m Faulkes North Telescope followed up robotically the GRB050716 detected by SWIFT (Rol et al. GCN 3623) 3.8 min after the GRB trigger time. The automatic "detection mode" procedure did not detect any obvious candidate up to about R=19.8 from 3 10-s images (mean epoch of 4.3 min after the GRB), with FOV of 4.6'x4.6' centred on the BAT in-flight location. The limiting magnitude is automatically calculated with respect to the USNOB1.0 'R2' values of the field objects. Further observations are ongoing. This message can be cited" //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3626 SUBJECT: GRB 050716: Optical Observations DATE: 05/07/16 14:56:39 GMT FROM: Ken ichi Torii at RIKEN K. Torii (Osaka U.) reports on behalf of the ART collaboration: The error region of GRB 050716 (Rol et al. GCN 3623) was observed by the Automated Response Telescope. The observation started at 2005 July 16 12:38:26 UT (142 s after the trigger) and BVRcIc frames of 60s integration were acquired. We do not detect an optical counterpart of the X-ray afterglow (GCN 3623, 3624) and derive its 3-sigma upper limit relative to USNO-B1.0 magnitude as follows. ================================ Start(UT) Filter Mag Exposure -------------------------------- 12:55:06 Ic >16.5 60s x27 -------------------------------- //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3627 SUBJECT: GRB050716, optical observation DATE: 05/07/16 15:10:57 GMT FROM: Eri Sonoda at U of Miyazaki/Japan E.Sonoda,S.Maeno,Y.Tokunaga,Myamauchi (University of Miyazaki) We have observed the field covering the error circle of GRB 050716 (GCN 3623,3624;Swift BAT Trigger time is 12:36:04 UT) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki. The observation was started 14:28:47 UT on July.16. We have compared with the USNO A2.0 catalog. Preliminary analysis shows there is no new source brighter than 16.8 mag. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3628 SUBJECT: GRB 050716: Lulin B and R band optical observations DATE: 05/07/16 17:13:22 GMT FROM: Yuji Urata at RIKEN Z.Y. Lin(NCU), K.Y. Huang, W.H. Ip (NCU), Y. Urata(RIKEN), Y. Qiu (BAO), Y.Q. Lou (THCA) on behalf of EAFON report: "We have imaged the GRB 050716 X-ray afterglow position (Rol et al. GCN 3623; J. Kennea et al. 3264) with B and R band using Lulin 1-m telescope. The observation was started at 14:30 (0.079 days after the burst) after rising the field. These images show no optical counterpart brighter than B=21.6 and R=21.3. These 3-sigma limiting magnitudes are derived from the USNO-B1.0 catalogue. This message may be cited." //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3629 SUBJECT: GRB050716: Refined analysis of the Swift-BAT burst DATE: 05/07/16 18:44:56 GMT FROM: Scott Barthelmy at NASA/GSFC S. Barthelmy (GSFC), L. Barbier (GSFC), J. Cummings (GSFC/NRC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (GSFC/UMD), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/NRC), J. Tueller (GSFC), M. Chester (PSU), L. Angelini (GSFC/JHU) on behalf of the Swift-BAT team: Using the full data set from the recent telemetry downlink, we report further analysis of Swift-BAT Trigger #146227 (E. Rol, et al., GCN 3623). The ground-analysis position is RA,Dec 338.607, 38.682 (J2000) with an uncertainty of 3 arcmin (radius, 90%, stat+sys). T90 is 69 +/-1 sec. The burst had a slow rise and slow decay with two broad peaks centered at T+12 and T+44 seconds. Fitting a cutoff power law over the full interval from T-14 to T+76 seconds, the photon index is 0.79 +/- 0.26, Epeak is 104 +29 -15 keV and the Norm at 1 keV is 0.34 +0.38 -.19 with a fluence of 8.3 +1.3 -0.6 X 10^-6 erg/cm^2 in the 15-350 keV band (90% c.l.). The peak flux in a 1-sec wide window starting at T+12.2 seconds is 2.23 +/- 0.41 ph/cm^2/sec (15-350 keV). //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3630 SUBJECT: GRB 050716: Refined XRT analysis. DATE: 05/07/16 19:30:32 GMT FROM: Cheryl Pauline Hurkett at Leicester U C. Hurkett, E. Rol, K. Page (U. Leicester), D. Burrows (PSU), J. Norris (GSFC), K. Hurley (Berkeley) and N. Gehrels (GSFC) report for the Swift XRT team: We have analysed the XRT data for GRB 050716 (GCN 3623, Rol et al) taken 104 seconds after the trigger. PSF fitting of the candidate afterglow in the photon counting (PC) mode observations yields a refined position of (J2000) RA 22:34:20.5 Dec +38:40:57.1 with an uncertainty of 6 arcseconds (90% containment). This position is less than 1 arcsecond from the position reported in GCN 3624 (Kennea et al). XRT observations began in Windowed Timing (WT) mode 104 seconds after the trigger and show a decline with a power-law decay index of 1.68 +/- 0.04 with flares at approximately 177 and 386 seconds. The decay index appears to stay the same at least until 6000 seconds after the trigger. The spectrum between 104 and 517 seconds after the trigger (WT data) has an average photon index of 1.32 (+/-0.04), with the absorption fixed at its Galactic value of 1.1e21 cm^-2. There is no evidence at the present time for excess absorption. The mean unabsorbed flux in WT mode at 230s (logarithmic mean time) is 7.02 (+0.27/-0.24) x 1e-10 erg/cm^2/s in the 0.5-10.0 keV energy range //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3631 SUBJECT: Swift UVOT Observations of GRB 050716 DATE: 05/07/16 20:24:33 GMT FROM: Katie McGowan at MSSL-UCL K. McGowan (MSSL), E. Rol (U. Leicester), J. Nousek (PSU), F. Marshall, N. Gehrels (GSFC) report on behalf of the Swift UVOT team: Using summed images from Swift/UVOT of the field of GRB 050716 (Rol et al., GCN 3623), taken from 99 seconds after the BAT trigger, no new source is detected within the XRT error circle (Hurkett et al., GCN 3630) in any of the six filters down to the following 3-sigma magnitude upper limits: Filter Exposure (s) T_mid (s) 3-sig limit V 178 487 19.1 B 979 3121 21.1 U 978 2660 20.7 UVW1 178 2200 19.7 UVM2 88 545 19.5 UVW2 755 3468 20.8 where T_mid is the mid-point of the summed observation. We caution that the instrument is not yet fully calibrated and that the magnitude limits presented here may need to be refined. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3632 SUBJECT: GRB 050716 - UKIRT identification of candidate afterglow DATE: 05/07/17 00:35:30 GMT FROM: Nial Tanvir at IofA U.Cambridge N. Tanvir, K. Lowe, T. Gledhill (U. of Hertfordshire), A. Levan, E. Rol, P. O'Brien, N. Bannister (U. of Leicester), T. Carroll (JACH), C. Guidorzi, A. Gomboc, A. Monfardini, I. Steele, C. Mundell, C. Mottram, M. Bode R. Smith, D. Carter (Liverpool JMU) report: We imaged the Swift/XRT error circle of GRB 050716 (GCN 3623/3624) with UKIRT/UFTI starting about 56 minutes post-burst. Just outside the XRT error circle we find a fading point source at position (astrometry relative to nearby 2MASS star): 22 34 20.73 +38 41 03.6 (J2000) Provisional photometry indicates that this source declines from K~17.8 to K~18.3 between two integrations separated by about 30 mins, making it very likely to be the afterglow of GRB 050716. Interestingly, it also appears to be red with J-K~2.5. A reanalysis of the very early FT-N data (GCN 3625), however, shows excess flux in R and I at the source position which, although not a clear detection (due to the faintness and proximity of nearby USNO star), suggests that the source is probably reddened rather than at very high redshift. Images can be found at: http://star-www.herts.ac.uk/~nrt/050716.html Further observations are planned. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3641 SUBJECT: GRB 050716; J-band observations DATE: 05/07/18 15:32:29 GMT FROM: Javier Gorosabel at LAEFF-INTA, Madrid J. Gorosabel, A.J. Castro-Tirado (IAA-CSIC, Granada), R. Lopez (Univ. of Barcelona), G. Andreuzzi (TNG, La Palma), A. de Ugarte Postigo, S. Guziy, M. Jelinek (IAA-CSIC, Granada), O. Bogdanov (Nikolaev State Univ.), report: "We have observed the field of GRB 050716 (Rol et al., GCN Circ. 3623) with the 3.5m TNG telescope on June 17.231-17.242 UT in the J-band (Texp = 15 min). The afterglow candidate reported by Tanvir et al. (GCN Circ. 3632) is not detected in our final combined image, which has a 3 sigma limiting magnitude of J~22." This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3789 SUBJECT: RBO GRB 050714A and GRB 050716 observations DATE: 05/08/13 12:09:45 GMT FROM: Ron Canterna at U of Wyoming C. Rodgers, E. Hausel, D. Allen and R. Canterna report on behalf of the Red Buttes Observatory GRB Team as part of the FUN GRB Collaboration. We responded to GRB 050714A (GCN 3607) at 05:11:41 UT with a series of 10 minute R and I exposures centered on the positon of the original Integral GRB Position under excellent conditions. No new source was detected after comparison with DSS. UT Time Since Filter Limiting Start GRB Magnitude 05:11 5:06 I 17.4 05:33 5:28 R 18.4 05:43 5:38 R 18.4 We also responded to GRB 050716 (GCN 3623) at 2005-07-17 05:52:03 UT. We took a series of 5 and 10 minute exposures in R and I with limiting magnitues of 18.6 in R and 17.4 in I. These observations were started 17 hours after the BAT trigger. No new source was detected after comparison with DSS. 10 sigma limiting magnitudes were derived from the USNO-B1.0 catalogue