GRB120729A

This page lists all entries on GRB120729A in GRBweb

Summary Fermi GBM IPN Swift Fermi LAT GCN 13530 GCN 13531 GCN 13532 GCN 13534 GCN 13536 GCN 13537 GCN 13539 GCN 13541 GCN 13543 GCN 13544 GCN 13545 GCN 13546 GCN 13547 GCN 13548 GCN 13550 GCN 13551 GCN 13554 GCN 13560 GCN 18184

Summary table
Variable Value Source
GRB_name_Fermi GRB120729456
T0 10:56:11.641 UTC Fermi_GBM
ra 13.0743° Swift
decl 49.9397° Swift
pos_error 6.47e-05° Swift
T90 25.472 s Fermi_GBM
T90_error 2.612 s Fermi_GBM
T90_start 10:56:11.641 UTC Fermi_GBM
fluence 5.08e-06 erg/cm² Fermi_GBM
fluence_error 5.30e-08 erg/cm² Fermi_GBM
redshift 0.8000 GCN_circulars,Other
T100 73.859 s
GBM_located False
mjd 56137.45569028935 Fermi_GBM
Fermi GBM table
GRB_name_Fermi GRB120729456
trigger_name bn120729456
ra 13.0742°
decl 49.9397°
pos_error 3.74e+00°
datum 2012-07-29
t_trigger 10:56:12.665 UTC
T90 25.472 s
T90_error 2.612 s
T90_start 10:56:11.641 UTC
fluence 5.08e-06 erg/cm²
fluence_error 5.30e-08 erg/cm²
flux_1024 5.20e+00 erg/cm²/s
flux_1024_error 3.03e-01 erg/cm²/s
flux_1024_time 1.22e+00 erg/cm²/s
flux_64 6.61e+00 erg/cm²/s
flux_64_error 1.28e+00 erg/cm²/s
IPN table
GRB_name GRB120729A
ra 13.0542°
decl 49.9333°
pos_error 5.00e-02°
redshift 0.8000
Swift table
GRB_name GRB120729A
t_trigger 10:56:14 UTC
ra 13.0743°
decl 49.9397°
pos_error 6.47e-05°
T90 71.5 s
fluence 2.40e-06 erg/cm²
redshift 0.8000
Fermi LAT table
GRB_name_Fermi GRB120729456
GRB_name GRB120729A
MET 365252176.0
datum 2012-07-29
t_trigger 10:56:13 UTC
ra 13.0743°
decl 49.9397°
pos_error 1.39e-04°
GCN 13530 table
GRB_name GRB120729A
GCN_number 13530
Detection_method Swift Det
t_trigger 10:56:14 UTC
ra 13.0560°
decl 49.9400°
Circular_text TITLE: GCN CIRCULAR NUMBER: 13530 SUBJECT: GRB 120729A: Swift detection of a burst with an optical afterglow DATE: 12/07/29 11:17:04 GMT FROM: David Burrows at PSU/Swift T. N. Ukwatta (MSU), D. N. Burrows (PSU), M. M. Chester (PSU), S. T. Holland (STScI), H. A. Krimm (CRESST/GSFC/USRA), V. Mangano (INAF-IASFPA), A. Maselli (INAF-IASFPA), E. Sonbas (NASA/GSFC/Adiyaman Univ.) and M. Stamatikos (OSU/NASA/GSFC) report on behalf of the Swift Team: At 10:56:14 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 120729A (trigger=529095). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 13.056, +49.940 which is RA(J2000) = 00h 52m 13s Dec(J2000) = +49d 56' 23" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a FRED-shaped structure with a total duration of about 25 sec. The peak count rate was ~5700 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 10:57:22.2 UT, 68.1 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source with an enhanced position: RA, Dec 13.0745, 49.9401 which is equivalent to: RA(J2000) = 00h 52m 17.88s Dec(J2000) = +49d 56' 24.5" with an uncertainty of 2.4 arcseconds (radius, 90% containment). This location is 43 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (1.42 x 10^21 cm^-2, Kalberla et al. 2005), with an excess column of 2.1 (+1.91/-1.68) x 10^21 cm^-2 (90% confidence). The initial flux in the 2.5 s image was 1.75e-09 erg cm^-2 s^-1 (0.2-10 keV). UVOT took a finding chart exposure of 150 seconds with the White filter starting 77 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at RA(J2000) = 00:52:17.84 = 13.07433 DEC(J2000) = +49:56:23.1 = 49.93974 with a 90%-confidence error radius of about 0.61 arc sec. This position is 1.4 arc sec. from the center of the XRT error circle. The estimated magnitude is 15.26 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.16. Burst Advocate for this burst is T. N. Ukwatta (tilan.ukwatta AT gmail.com). 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.)
GCN 13531 table
GRB_name GRB120729A
GCN_number 13531
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 13531 SUBJECT: GRB120729A - Faulkes Telescope North Optical Afterglow Candidate DATE: 12/07/29 11:40:07 GMT FROM: Francisco Virgili at Liverpool John Moores U F.J. Virgili (LJMU), J. Japelj (U. Ljubljana), C.G. Mundell (LJMU), A. Melandri (INAF-OAB) report: "The 2-m Faulkes Telescope North robotically followed up GRB120729A (SWIFT trigger 529095, Ukwatta et al. GCN 15530 ) 4.60 min after the GRB trigger time. The automatic "detection mode" procedure LT-TRAP (Guidorzi et al. 2006) detected a variable uncatalogued afterglow candidate consistent with the UVOT detection and within the XRT/UVOT and error circles at: RA 00 52 17.82 DEC 49 56 23 (J2000) with magnitude R = 16.4 mag (vs USNOB1) 4.60 min after the burst. Observations are ongoing.
GCN 13532 table
GRB_name GRB120729A
GCN_number 13532
Detection_method Other
redshift 0.8000
Circular_text TITLE: GCN CIRCULAR NUMBER: 13532 SUBJECT: GRB 120729A Gemini-N redshift DATE: 12/07/29 13:16:08 GMT FROM: Nial Tanvir at U.Leicester N. R. Tanvir (U. Leicester) and J. Ball (Gemini) report on behalf of a larger collaboration: We observed the afterglow of GRB 120729A (Ukwatta et al. GCN 13530) using the GMOS-N spectrograph on Gemini-North. Observations began at 2012-7-29 12:11 UT, about 75 mins post-burst. The spectrum reveals strong absorption lines of MgI, MgII, FeII, MnII. A provisional reduction gives a redshift of z=0.80, which we believe is most likely the redshift of this burst.
GCN 13534 table
GRB_name GRB120729A
GCN_number 13534
Detection_method Swift-XRT Det
ra 13.0745°
decl 49.9397°
Circular_text TITLE: GCN CIRCULAR NUMBER: 13534 SUBJECT: GRB 120729A: Enhanced Swift-XRT position DATE: 12/07/29 15:41:52 GMT FROM: Phil Evans at U of Leicester A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team. Using 1033 s of XRT Photon Counting mode data and 2 UVOT images for GRB 120729A, 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 = 13.07446, +49.93967 which is equivalent to: RA (J2000): 00h 52m 17.87s Dec (J2000): +49d 56' 22.8" with an uncertainty of 1.8 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) and Evans et al. (2009, MNRAS, 397, 1177). This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN 13536 table
GRB_name GRB120729A
GCN_number 13536
Detection_method Swift-BAT Det
ra 13.0780°
decl 49.9360°
Circular_text TITLE: GCN CIRCULAR NUMBER: 13536 SUBJECT: GRB 120729A, Swift-BAT refined analysis DATE: 12/07/29 16:17:26 GMT FROM: Hans Krimm at NASA-GSFC D. M. Palmer (LANL), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),C. B. Markwardt (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU)(i.e. the Swift-BAT team): Using the data set from T-61 to T+242 sec from the recent telemetry downlink, we report further analysis of BAT GRB 120729A (trigger #529095) (Ukwatta, et al., GCN Circ. 13530). The BAT ground-calculated position is RA, Dec = 13.078, 49.936 deg which is RA(J2000) = 00h 52m 18.8s Dec(J2000) = +49d 56' 08.5" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 76%. The mask-weighted light curve shows a single FRED peak with a rise of ~20 secs and a fall of ~100 seconds. There are no significant subsidiary peaks. T90 (15-350 keV) is 71.5 +- 17.5 sec (estimated error including systematics). The time-averaged spectrum from T-3.08 to T+101.94 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.62 +- 0.08. The fluence in the 15-150 keV band is 2.4 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-0.03 sec in the 15-150 keV band is 2.9 +- 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/529095/BA/
GCN 13537 table
GRB_name GRB120729A
GCN_number 13537
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 13537 SUBJECT: GRB 120729A: Xinglong TNT optical upper limit DATE: 12/07/29 17:51:13 GMT FROM: L.P. Xin at NAOC L.P. Xin, J. Y. Wei, Y.L. Qiu, J. Wang, J.S. Deng, C. Wu, X. H. Han on behalf of EAFON report: We began to observe GRB 120729A (Ukwatta et al. GCN Circ. 13530 ) with Xinglong TNT telescope at 15:23:22.671 (UT), 4.45 hour after the burst. A series of R-band images were obtained. Preliminary analysis shows that no any source was found at the location of optical counterpart (Ukwatta et al. GCN Circ. 13530; Virgili et al. GCN 13531), down to 3 sigma upper limit of R~19.5 mag, relatively to the USNO B1.0 R2 mag, at the mean time of 4.8 hour after the burst. This message may be cited. Thanks to the help of TNT observation assistant for this work. For more information about Xinglong GRBs Follow-up observations, please visit the website: http://www.xinglong-naoc.org/grb/
GCN 13539 table
GRB_name GRB120729A
GCN_number 13539
Detection_method Swift-UVOT Det
ra 13.0743°
decl 49.9397°
Circular_text TITLE: GCN CIRCULAR NUMBER: 13539 SUBJECT: GRB 120729A: Swift/UVOT Detection DATE: 12/07/29 18:39:35 GMT FROM: Samantha Oates at MSSL S. R. Oates (MSSL-UCL) and T. N. Ukwatta (MSU) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 120729A 77 s after the BAT trigger (Ukwatta et al., GCN Circ. 13530). A source consistent with the XRT position (Beardmore et al., GCN Circ. 13534) and the optical position reported by FTN (Virgili et al., GCN Circ. 13531) is detected in the initial UVOT exposures. The preliminary UVOT position is: RA (J2000) = 00:52:17.83 = 13.07431 (deg.) Dec (J2000) = +49:56:23.1 = 49.93974 (deg.) with an estimated uncertainty of 0.50 arc sec. (radius, 90% confidence). Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white 77 227 147 15.33 +/- 0.02 v 620 640 20 15.92 +/- 0.15 b 545 564 20 16.56 +/- 0.12 u 289 539 246 15.78 +/- 0.04 w1 4113 4313 197 18.49 +/- 0.16 m2 3908 4108 197 18.91 +/- 0.25 w2 595 615 20 17.57 +/- 0.32 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.16 in the direction of the burst (Schlegel et al. 1998).
GCN 13541 table
GRB_name GRB120729A
GCN_number 13541
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 13541 SUBJECT: GRB 120729A: Swift-XRT refined Analysis DATE: 12/07/29 23:17:06 GMT FROM: Phil Evans at U of Leicester A. Maselli (INAF-IASFPA), D.N. Burrows (PSU), J.A. Kennea (PSU), M.C. Stroh (PSU), O.M. Littlejohns (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), V. Mangano (INAF-IASFPA), A. Melandri (INAF-OAB) and T.N. Ukwatta report on behalf of the Swift-XRT team: We have analysed 13 ks of XRT data for GRB 120729A (Ukwatta et al. GCN Circ. 13530), from 74 s to 29.5 ks after the BAT trigger. The data comprise 170 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN. Circ 13534). The light curve can be modelled with an initial power-law decay with an index of alpha=1.115 (+0.023, -0.022), followed by a break at T+8203 s to an alpha of 2.9 (+/-0.4). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.56 (+/-0.10). The best-fitting absorption column is 1.9 (+/-0.3) x 10^21 cm^-2, in excess of the Galactic value of 1.4 x 10^21 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 1.87 (+0.15, -0.14) and a best-fitting absorption column of 2.1 (+0.5, -0.4) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.2 x 10^-11 (5.8 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 2.1 (+0.5, -0.4) x 10^21 cm^-2 Galactic foreground: 1.4 x 10^21 cm^-2 Excess significance: 2.5 sigma Photon index: 1.87 (+0.15, -0.14) The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00529095. This circular is an official product of the Swift-XRT team.
GCN 13543 table
GRB_name GRB120729A
GCN_number 13543
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 13543 SUBJECT: T100 observations of GRB 120729A DATE: 12/07/30 10:54:36 GMT FROM: Tolga Guver at UA Guver, T. (Sabanci Univ.), Sonbas, E. (GSFC, Adiyaman Univ.), S. Kaynar (Akdeniz Univ.), O. Onal (Istanbul Univ.), S. Tuncel Guctekin (Istanbul Univ.), Gogus, E. (Sabanci Univ.), S. Ak (Istanbul Univ.), Z. Eker (TUG) on behalf of a larger collaboration. We observed the field of GRB 120729A (Ukwatta et al., GCN #13530) with the 1.0 meter T100 telescope (TUBITAK National Observatory, Antalya - Turkey), starting at 2012-07-29, 19:43:07 UT ( ~9 hours after the trigger). We obtained 4 x 300 s exposures with R filter under poor weather conditions (seeing 2.4"). Similar to the report by Xin et al. (GCN #13537) we do not detect an optical afterglow at the UVOT error circle reported by Ukwatta et al. (GCN #13530) in the combined R band image. We determine the 4-sigma detection limit of our R band image to be 20.04 mag, (calibrated to R2 of USNO-B1). We are grateful to the TUBITAK National Observatory staff for promptly scheduling the observations and their technical support. ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program.
GCN 13544 table
GRB_name GRB120729A
GCN_number 13544
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 13544 SUBJECT: GRB 120729A: UKIRT Observation DATE: 12/07/30 14:05:05 GMT FROM: Myungshin Im at Seoul Nat U Myungshin Im and Jueun Hong (CEOU/Seoul National Univ.) on behalf of a larger collaboration. We observed GRB 120729A (Ukwatta et al., GCN 13530) in ZYJHK using WFCAM on UKIRT. The observation started at 2012-07-29 13:01:41 UT, or about 2.09 hours after the BAT alert. In all of the ZYJHK images, we identify the afterglow (H ~ 18.0 AB mag) which was reported earlier by several groups (Virgili et al. GCN 13531; Oates et al. GCN 13539). We also confirm fading of the object from another set of WFCAM data we took about 3 hours later. Further observations are planned.
GCN 13545 table
GRB_name GRB120729A
GCN_number 13545
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 13545 SUBJECT: GRB 120729A: Early RAPTOR Observations DATE: 12/07/30 21:15:47 GMT FROM: James Wren at LANL J. Wren, P. Wozniak, H. Davis, and W.T. Vestrand of Los Alamos National Laboratory report: The RAPTOR network of robotic optical telescopes responded to Swift trigger 529095 (Ukwatta et al., GCN 13530). Observations began at 10:56:42.0 UT, 27.9 s after the initial Swift trigger and before the end of the gamma-ray emitting interval. Our observations were performed under clear skies with morning twilight just beginning. We clearly detect the optical counterpart (Ukwatta et al., GCN 13530, and Virgili et al., GCN 13531). We initially detect the counterpart at a magnitude of 13.2, and at about T+50 s it begins to fade steadily at a power law index of about 0.9 for the next 1000 seconds. Our unfiltered magnitudes are calibrated against the USNO-B1 R-band. The following table gives a sample of some of our observations. The image mid-points are given relative to the initial BAT trigger time. t-mid(s) exp(s) mag error -------------------------------------- 30.4 5 13.21 0.01 39.8 5 13.28 0.01 49.2 5 13.35 0.01 118.4 10 14.18 0.01 248.8 10 14.97 0.02 391.8 30 15.36 0.02 817.0 30 16.11 0.06 1071.4 30 16.46 0.11
GCN 13546 table
GRB_name GRB120729A
GCN_number 13546
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 13546 SUBJECT: Virtual Telescope observations of GRB 120729A DATE: 12/07/30 21:58:10 GMT FROM: Gianluca Masi at Bellatrix Astronomical Obs G. Masi (Ceccano, Italy) and F. Nocentini (Frosinone, Italy) report: On July 29.9496 2012 UT, we imaged the field around the position provided by Ukwatta et al. (GCN 13530) with the 0.43m-f/6.8 unit part of the Virtual Telescope robotic facility in Italy. 4, 300 seconds unfiltered CCD images were coadded and compared with a R plate from the DSS2: they do NOT show any obvious afterglow, down to R = 20.0 (based on USNO B1.0). The position of the afterglow mentioned on GCN 13530 is close to a R=19.2 source (with end figures 18.28s and 23.2", J2000).
GCN 13547 table
GRB_name GRB120729A
GCN_number 13547
Detection_method VLA Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 13547 SUBJECT: GRB 120729A: EVLA Observations DATE: 12/07/31 02:39:04 GMT FROM: Tanmoy Laskar at Harvard U T. Laskar, A. Zauderer and E. Berger (Harvard) report: "We observed the position of GRB 120729A (Ukwatta et al. GCN 13530) with the EVLA beginning 2012 July 30.3 UT (0.84 days after the burst). No significant radio emission is detected at the enhanced Swift-XRT position (Beardmore et al. GCN 13534), the UVOT position (Oates et al. GCN 13539) or optical position (Virgili et al. GCN 13531) to three-sigma upper limits of 39 uJy and 58 uJy, at 5.8 and 21.8 GHz, respectively."
GCN 13548 table
GRB_name GRB120729A
GCN_number 13548
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 13548 SUBJECT: GRB 120729A: RTT150 optical observations DATE: 12/07/31 10:28:25 GMT FROM: Rodion Burenin at IKI, Moscow I. Khamitov (TUG), E.Beklen (SD Uni.), Z. Eker (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.), R. Burenin, M. Pavlinsky, R. Sunyaev (IKI), I. Bikmaev, N. Sakhibullin (Kazan Federal University) report: We observed the field of the Swift-BAT GRB 120729A (Ukwatta et al. GCN 15530 ) with Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National Observatory, Turkey), starting at 30 Jul, 01:26 UT, i.e. approximately 14.5 hours after the burst, using TFOSC instrument. We made 6x300s exposures in R-band under good atmospheric conditions (1.4 arcsec seeing) at the beginning of morning twilight without moonlight. We do not detect any new source on combined image at the position of OT (Virgili et al., GCN13531; Oates and Ukwatta, GCN13539). Using USNO-B1 stars we estimated the limiting magnitude of combined image as m_R =~ 23.5. A small field around of the OT position can be found at: http://hea.iki.rssi.ru/grb/120729a/indexeng.html
GCN 13550 table
GRB_name GRB120729A
GCN_number 13550
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 13550 SUBJECT: GRB 120729A: Optical observations from OSN, BOOTES1/2 and IAC80 DATE: 12/07/31 10:53:25 GMT FROM: Javier Gorosabel at IAA-CSIC J. Gorosabel (IAA-CSIC), M. Jelinek (IAA-CSIC), Ch. Wang (Yunnan Observatory, China), C. Zurita (IAC), A. Sota (OSN, IAA-CSIC), J.C. Tello (IAA-CSIC), R. Sanchez-Ramirez (IAA-CSIC), A.J. Castro-Tirado (IAA-CSIC), report on behalf of a larger collaboration: "We carried out BRI-band observations of the GRB 120729A (Ukwatta et al. GCN Circ. 13530) optical afterglow (Virgili et al. GCN Circ. 13531; Oates et al. GCN Circ. 13539) as follows: Telescope Obs.Date(UT) Time post GRB(hr) Exp.Time(s) Mag.(Vega) ------------------------------------------------------------------------ 0.3m Bootes-1B 29.879537-30.022106 10.17-13.58 326x30 R > 19.0 0.6m Bootes-2 30.007951-30.042095 13.25-14.07 50x60 R > 19.4 1.5m OSN 30.077613-30.163785 14.93-16.99 18x300 R > 22.1 1.5m OSN 30.096195-30.099667 15.37-15.45 1x300 B > 21.5 0.82m IAC80 30.120174-30.205093 15.95-17.98 22x300 I = 21.9+/-0.3 The calibration was based on the USNO B1.0 catalogue."
GCN 13551 table
GRB_name GRB120729A
GCN_number 13551
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 13551 SUBJECT: GRB 120729A: break in the optical light curve DATE: 12/07/31 11:06:32 GMT FROM: Andrea Melandri at INAF-OAB P. D'Avanzo, A. Melandri (INAF-OAB), I. Steele, C.G. Mundell (LJMU), E. Palazzi (INAF-IASFBo) report, on behalf of larger collaborations: We observed the optical counterpart of GRB 120729A (Ukwatta et al., GCN 13530; Virgili et al., GCN 13531; Oates et al., GCN 13539; Wren et al., GCN 13545) with the 2-m Faulkes Telescope North (FTN), the 2-m Liverpool Telescope (LT) and with the Italian 3.6m Telescopio Nazionale Galileo (TNG). Early time observations were carried out from 4.6 min to 2.1 hours after the burst with the FTN, while a later observation epoch was taken at a mid time of about 14.5 hours after the burst with the LT and the TNG. From a preliminary analysis the overall R-band light curve can be described by an initial power-law decay with an index of alpha1=1.0 that breaks around t-t0=6000 s to a steeper decay with alpha2=1.8. The early time decay is consistent with the report of Wren et al. (GCN 13545). The last detection was obtained with the TNG at a level of R ~ 23.3 mag (15.1 hours post burst) consistent with the marginal detections obtained with LT SDSS-r filter (image acquired ~13.6 hours after the burst). These late time values fall slightly below the best broken power-law fit described above, suggesting that the post-break decay index might be steeper than 2. We note that the reported X-ray afterglow decay (Maselli et al., GCN 13541) shows a similar behaviour and that this may be indicative of an achromatic break in the afterglow light curve. We thank the TNG staff for performing the ToO observations, in particular Massimo Cecconi.
GCN 13554 table
GRB_name GRB120729A
GCN_number 13554
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 13554 SUBJECT: GRB 120729A: JCMT SCUBA-2 sub-mm observation DATE: 12/07/31 22:33:41 GMT FROM: Ian Smith at Rice U I.A. Smith (Rice U.), R.P.J. Tilanus (JAC), N.R. Tanvir (U. of Leicester), D.A. Frail (NRAO) report: We observed the location of GRB 120729A (Ukwatta et al., GCN Circ. 13530) using the SCUBA-2 sub-millimeter continuum camera on the James Clerk Maxwell Telescope. The observation started at 12:14 UT on 2012-07-29, corresponding to 78 minutes after the burst trigger. Exposures totaling 3.1 hours were made in reasonable weather conditions. No source was detected, with a preliminary RMS of 1.8 mJy/beam at 850 microns. We thank Jeff Cox and Ruud Visser for their prompt support of these observations.
GCN 13560 table
GRB_name GRB120729A
GCN_number 13560
Detection_method Fermi GBM Det
t_trigger 10:56:12.670 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 13560 SUBJECT: GRB 120729A: Fermi GBM observation DATE: 12/08/02 12:40:37 GMT FROM: Arne Rau at MPE Arne Rau (MPE) reports on behalf of the Fermi GBM Team: "At 10:56:12.67 UT on 29 July 2012, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 120729A (trigger 365252175 / 120729456) which was also detected by the Swift/BAT (Ukwatta et al. 2012, GCN 13530). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 83 degrees. The GBM light curve shows a single pulse with a duration (T90) of about 25 s (50-300 keV). The time-averaged spectrum from T0-3.6 s to T0+17.9 s is best fit by a simple power law function with index -1.49 +/- 0.05. The event fluence (10-1000 keV) in this time interval is (5.1 +/- 0.1)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+1.2 s in the 10-1000 keV band is 5.2 +/- 0.3 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN 18184 table
GRB_name GRB120729A
GCN_number 18184
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 18184 SUBJECT: GRB 120729A: KAIT Optical Observations DATE: 15/08/20 18:56:44 GMT FROM: Xiang-Gao Wang at GuangXi U Xianggao Wang (UC Berkeley, GXU, UNLV), WeiKang Zheng, Alexei V. Filippenko (UC Berkeley), and S. Bradley Cenko (GSFC) report on behalf of the KAIT GRB team: The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at Lick Observatory, responded to Swift GRB 120729A (Ukwatta et al., GCN 13530) starting at 10:58:16 UT, 122 s after the burst. Observations were performed with an automatic sequence in the clear (roughly R), V, and I filters, and the exposure time was 20 s per image. The bright optical afterglow (Ukwatta et al. GCN 13530, Virgili et al. GCN 13531, Oates et al. GCN 13539, Im et al. 13544, Wren et al. 13545, Khamitov et al. GCN 13548, Gorosabel GCN 13550, D'Avanzo et al. GCN 13551, Smith et al. GCN 13554) was detected in all three filters. Useful observations lasted for about 2.4 hours. Preliminary analysis shows that the afterglow decays with a single power (with alpha = -0.87) beyond 1000 s after the burst. A light curve is posted at http://astro.berkeley.edu/~zwk/grb/GRB120729A/GRB120729A_kait.png .