GRB121024A

This page lists all entries on GRB121024A in GRBweb

Summary IPN Swift GCN 13886 GCN 13887 GCN 13888 GCN 13889 GCN 13890 GCN 13891 GCN 13892 GCN 13893 GCN 13894 GCN 13896 GCN 13897 GCN 13898 GCN 13899 GCN 13900 GCN 13901 GCN 13903 GCN 13904 GCN 13928 GCN 13931

Summary table
Variable Value Source
T0 2:56:12 UTC GCN_circulars,Swift Det
ra 70.4720° Swift
decl -12.2908° Swift
pos_error 1.01e-04° Swift
T90 69.0 s Swift
T90_start 2:56:12 UTC Swift
fluence 1.10e-06 erg/cm² Swift
redshift 2.2980
T100 69.0 s
GBM_located False
mjd 56224.12236111111 GCN_circulars,Swift Det
IPN table
GRB_name GRB121024A
ra 70.4667°
decl -12.2667°
pos_error 5.00e-02°
redshift 2.2980
Swift table
GRB_name GRB121024A
t_trigger 2:56:12 UTC
ra 70.4720°
decl -12.2908°
pos_error 1.01e-04°
T90 69.0 s
fluence 1.10e-06 erg/cm²
redshift 2.2980
GCN 13886 table
GRB_name GRB121024A
GCN_number 13886
Detection_method Swift Det
t_trigger 2:56:12 UTC
ra 70.4670°
decl -12.2690°
Circular_text TITLE: GCN CIRCULAR NUMBER: 13886 SUBJECT: GRB 121024A: Swift detection of a burst with an optical counterpart DATE: 12/10/24 03:12:57 GMT FROM: Scott Barthelmy at NASA/GSFC C. Pagani (U Leicester), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), C. Gronwall (PSU), J. A. Kennea (PSU), C. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), T. Sakamoto (AGU), B. Sbarufatti (INAF-OAB/PSU), M. H. Siegel (PSU) and T. N. Ukwatta (MSU) report on behalf of the Swift Team: At 02:56:12 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 121024A (trigger=536580). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 70.467, -12.269 which is RA(J2000) = 04h 41m 52s Dec(J2000) = -12d 16' 06" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a few overlapping peaks with a duration of about 15 sec. The peak count rate was ~3500 counts/sec (15-350 keV), at ~1 sec after the trigger. The XRT began observing the field at 02:57:45.5 UT, 93.0 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 70.4715, -12.2904 which is equivalent to: RA(J2000) = +04h 41m 53.16s Dec(J2000) = -12d 17' 25.4" with an uncertainty of 5.5 arcseconds (radius, 90% containment). This location is 78 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy. The initial flux in the 2.5 s image was 1.10e-09 erg cm^-2 s^-1 (0.2-10 keV). UVOT took a finding chart exposure of 250 seconds with the U filter starting 158 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at RA(J2000) = 04:41:53.28 = 70.47201 DEC(J2000) = -12:17:26.8 = -12.29079 with a 90%-confidence error radius of about 0.78 arc sec. This position is 2.3 arc sec. from the center of the XRT error circle. The estimated magnitude is 18.38 with a 1-sigma error of about 0.16. No correction has been made for the expected extinction corresponding to E(B-V) of 0.10. Burst Advocate for this burst is C. Pagani (cp232 AT star.le.ac.uk). 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 13887 table
GRB_name GRB121024A
GCN_number 13887
Detection_method Optical
ra 70.4725°
decl -12.2908°
Circular_text TITLE: GCN CIRCULAR NUMBER: 13887 SUBJECT: GRB 121024A: TAROT Calern observatory optical detection of a bright counterpart DATE: 12/10/24 03:20:53 GMT FROM: Alain Klotz at CESR-CNRS Klotz A. (IRAP-CNRS-OMP), Gendre B. (ASDC/INAF-OAR), Boer M. (UNS-CNRS-OCA), Atteia J.L. (IRAP-CNRS-OMP) report: We imaged the field of GRB 121024A detected by SWIFT (trigger 536580) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France. The observations started 45.0s after the GRB trigger (13.9s after the notice). The elevation of the field decreased from 32 degrees above horizon and weather conditions were good. The first image is trailed with a duration of 60.0s (see the description in Klotz et al., 2006, A&A 451, L39). We detect a new fading source in the error box given by SWIFT We detected the candidate couterpart mentioned by Pagani et al. (GCNC 13886) at the following position (+/- 2 arcsec): RA(J2000) = 04h 41m 53.41s DEC(J2000) -12d 17' 26.9" OT was R~13.3 betwenn 45.0s and 60s after GRB. Then the flux decreases. Observations are continuing. Magnitudes were estimated with the nearby NOMAD1 stars and are not corrected for galactic dust extinction. N.B. Galactic coordinates are lon=209.4933 lat=-34.2488 and the galactic extinction in R band is about 0.1 magnitude estimated from D. Schlegel et al. 1998ApJ...500..525S. This message may be cited. [GCN OPS NOTE(24oct12): Per author's request, the circular citation was added and the uncertainty was increased from 1 to 2 arcsec.]
GCN 13888 table
GRB_name GRB121024A
GCN_number 13888
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 13888 SUBJECT: GRB 121024A: BOOTES-1B optical detection DATE: 12/10/24 05:03:53 GMT FROM: Martin Jelinek at Inst.Astrophys.Andalucia,Granada Martin Jelinek, Alberto J. Castro-Tirado and Javier Gorosabel (IAA-CSIC Granada) on behalf of a larger collaboration report: "The 0.3m BOOTES-1B robotic telescope located in Huelva (Spain), observed the optical afterglow of GRB 121024A (Pagani et al., GCNC 13886; Klotz et al., GCNC 13887). The observations started 40 minutes after the GRB trigger. The sum of 20 minutes of unfiltered images with a mean integration time 54 minutes after the GRB shows the OT with magnitude roughly 18.2+-0.5."
GCN 13889 table
GRB_name GRB121024A
GCN_number 13889
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 13889 SUBJECT: Skynet PROMPT/Dolomiti observations of GRB121024A DATE: 12/10/24 05:47:22 GMT FROM: Aaron LaCluyze at U.North Carolina A. LaCluyze, J. Haislip, K. Ivarsen, D. Reichart, J. Moore, H. T. Cromartie, R. Egger, A. Foster, N. Frank, M. Nysewander, A. Oza, E. Speckhard, A.Trotter, and J. A. Crain report: Skynet observed the field of GRB121024A (GCN 13886, Swift trigger #536580) with the PROMPT telescopes located at CTIO in Chile and the 16" Dolomites Astronomical Observatory telescope (DAO) in Italy beginning ~1 minute after the burst trigger. We detect the fading optical source reported by Klotz et al. (GCN #13887) in all observed filters (g',r',i',z' and BRI.) Further observations are ongoing.
GCN 13890 table
GRB_name GRB121024A
GCN_number 13890
Detection_method Other
redshift 2.2980
Circular_text TITLE: GCN CIRCULAR NUMBER: 13890 SUBJECT: GRB 121024A: VLT/X-shooter redshift DATE: 12/10/24 07:10:59 GMT FROM: Nial Tanvir at U.Leicester N. R. Tanvir (U. Leicester), J. P. U. Fynbo (DARK/NBI), A. Melandri (INAF-OAB), A. J. Levan (U. Warwick), D. Xu (WIS), V. D'Elia (ASDC) report on behalf of the X-shooter GTO collaboration: We observed the afterglow of GRB 121024A (Pagani et al. GCN 13886) with the X-shooter spectrograph at the VLT. Observations began at 04:45 UT, approximately 1.8 hours after the initial detection of the burst. The afterglow is well detected in the acquisition image, and in the resulting spectrum we see a strong, broad damped-Lya absorption feature at ~4000A, combined with numerous narrow metal lines of CIV, SiII, SiIV, FeII, SII and AlII, as well as fine-structure lines associated with SiII*. These point to a common redshift of z=2.298 for GRB 121024A. We thank Maja Vuckovic, Giovanni Carraro, Marcelo Lopez and Felipe Gaete for their assistance in obtaining these observations, and Gianni Marconi and Gerry Gilmore for kindly allowing the ToO to be performed during their visitor mode run.
GCN 13891 table
GRB_name GRB121024A
GCN_number 13891
Detection_method GROND
ra 70.4721°
decl -12.2907°
Circular_text TITLE: GCN CIRCULAR NUMBER: 13891 SUBJECT: GRB 121024A: GROND Detection of the Optical/NIR Afterglow DATE: 12/10/24 11:31:10 GMT FROM: Patricia Schady at MPE/Swift F. Knust, P. Schady and J. Greiner (all MPE Garching) report on behalf of the GROND team We observed the field of GRB 121024A (Pagani et al., GCN 13886) simultaneously in g'r'i'z' with GROND (Greiner et al. 2008, PASP, 120, 405) mounted on the 2.2 m MPG/ESO telescope at La Silla Observatory (Chile). Due to clouds, observations only started at 05:53 UT no 24th October, 3 hours after the GRB trigger, and continued until the end of the night, 3.8 hours later. They were performed at an average seeing of 1.4" and at an average airmass of 1.1. We find a single point source within the 0.8 arcsec Swift/UVOT error circle reported by Pagani et al. (GCN 13886) at RA (J2000) = 04:41:53.30 Dec (J2000) = -12:17:26.5 with an uncertainty of 0.4" in each coordinate. Based on the first 142 sec integration in g'r'i'z' and 240 sec integration in JHK taken at a mid-time of 05:58 UT and 05:54 UT in the optical and NIR respectively, we estimate preliminary magnitudes (all in AB system) of g' = 21.0 +/- 0.2 mag r' = 20.1 +/- 0.2 mag i' = 19.8 +/- 0.2 mag z' = 19.5 +/- 0.2 mag J = 18.7 +/- 0.1 mag H = 18.4 +/- 0.1 mag K = 17.9 +/- 0.1 mag Given magnitudes are calibrated against GROND zeropoints in the optical, and 2MASS field stars in the NIR, and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E(B-V) = 0.1 mag in the direction of the burst (Schlegel et al. 1998).
GCN 13892 table
GRB_name GRB121024A
GCN_number 13892
Detection_method Swift-XRT Other
ra 70.4708°
decl -12.2910°
redshift 2.2980
Circular_text TITLE: GCN CIRCULAR NUMBER: 13892 SUBJECT: GRB 121024A: Swift-XRT refined Analysis DATE: 12/10/24 19:24:10 GMT FROM: Phil Evans at U of Leicester K.L. Page (U. Leicester), A. Maselli (INAF-IASFPA), V. Mangano (INAF-IASFPA), A. Melandri (INAF-OAB), M.C. Stroh (PSU), D.N. Burrows (PSU), J.A. Kennea (PSU), A.P. Beardmore (U. Leicester) and C. Pagani report on behalf of the Swift-XRT team: We have analysed 7.0 ks of XRT data for GRB 121024A (Pagani et al. GCN Circ. 13886), from 82 s to 23.5 ks after the BAT trigger. The data comprise 242 s in Windowed Timing (WT) mode (the first 9 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The refined XRT position is RA, Dec = 70.47078, -12.29099 which is equivalent to: RA (J2000): 04 41 52.99 Dec(J2000): -12 17 27.6 with an uncertainty of 3.5 arcsec (radius, 90% confidence). The late-time light curve (from T0+3.9 ks) can be modelled with a power-law decay with a decay index of alpha=0.89 (+/-0.13). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.15 (+/-0.08). The best-fitting absorption column is 8.0 (+2.1, -2.0) x 10^21 cm^-2, at a redshift of 2.298, in addition to the Galactic value of 5.4 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 1.96 (+/-0.13) and a best-fitting absorption column of 7.1 (+4.0, -3.6) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.7 x 10^-11 (4.7 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Galactic foreground: 5.4 x 10^20 cm^-2 Intrinsic column: 7.1 (+4.0, -3.6) x 10^21 cm^-2 at z=2.298 Photon index: 1.96 (+/-0.13) If the light curve continues to decay with a power-law decay index of 0.89, the count rate at T+24 hours will be 0.016 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 5.8 x 10^-13 (7.3 x 10^-13) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00536580. This circular is an official product of the Swift-XRT team.
GCN 13893 table
GRB_name GRB121024A
GCN_number 13893
Detection_method correction
Circular_text TITLE: GCN CIRCULAR NUMBER: 13893 SUBJECT: GRB 121024A: PAIRITEL NIR Detection DATE: 12/10/24 19:52:45 GMT FROM: Adam Morgan at U.C. Berkeley A. N. Morgan, and J. S. Bloom (UC Berkeley) report: We observed the field of GRB 121024A (Pagani et al., GCN 13886) with the 1.3m PAIRITEL located at Mt. Hopkins, Arizona. Observations began at 2012-Oct-24 07h31m47s UT, ~4.6 hours after the Swift Trigger. In mosaics (effective exposure time of 0.46 hours) taken simultaneously in the J, H, and K filters, we detect a source at the optical afterglow location (Pagani et al., GCN 13886; Klotz et al., GCN 13887; Jelinek et al., GCN 13888; LaCluyze et al., GCN 13889; Knust et al. GCN 13891). The preliminary photometry yields: post burst t_mid (hr) exp.(hr) filt mag m_err 6.06 0.46 J >18.4 3sig 6.06 0.46 H 17.1 0.2 6.06 0.46 Ks >16.2 3sig All magnitudes are given in the Vega system, calibrated to 2MASS. No correction for Galactic extinction has been made to the above reported values.
GCN 13894 table
GRB_name GRB121024A
GCN_number 13894
Detection_method Swift-XRT Det
ra 70.4721°
decl -12.2905°
Circular_text TITLE: GCN CIRCULAR NUMBER: 13894 SUBJECT: GRB 121024A: Enhanced Swift-XRT position DATE: 12/10/25 00:58:32 GMT FROM: Phil Evans at U of Leicester J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team. Using 7610 s of XRT Photon Counting mode data and 6 UVOT images for GRB 121024A, 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 = 70.47208, -12.29052 which is equivalent to: RA (J2000): 04h 41m 53.30s Dec (J2000): -12d 17' 25.9" with an uncertainty of 1.4 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 13896 table
GRB_name GRB121024A
GCN_number 13896
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 13896 SUBJECT: GRB 121024A: MITSuME Okayama Optical upper limits DATE: 12/10/25 10:54:18 GMT FROM: Daisuke Kuroda at OAO/NAOJ D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of the MITSuME collaboration: We observed the field of GRB 121024A (Pagani et al., GCNC 13886) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory. The observation started on 2012-10-24 13:51:59 UT (~10.9 h after the burst) We did not find any new point source within the enhanced XRT circle (Osborne et al., GCNC 13894) in all the three bands. We also could not detect the previously reported afterglow (Klotz et al., GCNC 13887). Three sigma upper limits of the OT are listed below. We used GSC2.3 catalog for flux calibration. T0+[day] MID-UT T-EXP[sec] g' Rc Ic ------------------------------------------------------ 0.55338 16:13:04 7740.0 >20.1 >20.0 >19.3 ------------------------------------------------------ T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]
GCN 13897 table
GRB_name GRB121024A
GCN_number 13897
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 13897 SUBJECT: GRB 121024A: MITSuME Ishigakijima upper limits DATE: 12/10/25 12:20:18 GMT FROM: Daisuke Kuroda at OAO/NAOJ D. Kuroda (OAO, NAOJ), H. Hanayama, T. Miyaji, J. Watanabe (IAO, NAOJ), K. Yanagisawa (OAO, NAOJ), S.Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of the MITSuME collaboration: We observed the field of GRB 121024A (Pagani et al., GCNC 13886) with the optical three color (g', Rc and Ic) CCD camera attached to the Murikabushi 1m telescope of Ishigakijima Astronomical Observatory. The observation started on 2012-10-24 14:30:52 UT (~11.6 h after the burst) We did not find any new point source within the enhanced XRT circle (Osborne et al., GCNC 13894) in all the three bands. We also could not detect the previously reported afterglow (Klotz et al., GCNC 13887). Three sigma upper limits of the OT are listed below. We used GSC2.3 catalog for flux calibration. T0+[day] MID-UT T-EXP[sec] g' Rc Ic ------------------------------------------------------ 0.52401 15:30:47 6060.0 >21.7 >21.4 >20.6 ------------------------------------------------------ T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]
GCN 13898 table
GRB_name GRB121024A
GCN_number 13898
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 13898 SUBJECT: GRB 121024A: GMG optical observation DATE: 12/10/25 13:49:44 GMT FROM: Xiao-hong Zhao at Yunnan Obs X.-H. Zhao (YNAO), J.-R. Mao (KASI/YNAO), J.-M. Bai (YNAO) report on behalf of a larger collaboration: We observed the field of GRB 121024A (Pagani et al., GCN 13886) with 2.4m Gao-Mei-Gu (GMG) telescope. Observations started at 16:30:00 UT on 2012-10-24 (i.e., 13.6 hrs after the burst) and 2x900s R-band images were obtained. The optical afterglow of this burst was clearly detected. The results are as follows: mid time from trigger (hr) Mag. Err. Exposure time (second) 13.69 20.88 0.1 900 13.81 20.81 0.1 900 We thank the GMG staff, especially Fang Wang, De-Qing Wang and Jian-Duo He for performing these observations.
GCN 13899 table
GRB_name GRB121024A
GCN_number 13899
Detection_method Swift-BAT Det
ra 70.4810°
decl -12.2550°
Circular_text TITLE: GCN CIRCULAR NUMBER: 13899 SUBJECT: GRB 121024A: Swift-BAT refined analysis DATE: 12/10/25 14:39:10 GMT FROM: Scott Barthelmy at NASA/GSFC S. D. Barthelmy (GSFC), T. Sakamoto (AGU), 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), C. Pagani (U Leicester), D. M. Palmer (LANL), 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-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 121024A (trigger #536580) (Pagani, et al., GCN Circ. 13886). The BAT ground-calculated position is RA, Dec = 70.481, -12.255 deg, which is RA(J2000) = 04h 41m 55.5s Dec(J2000) = -12d 15' 19.1" with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 50%. The mask-weighted light curve shows two overlapping peaks starting at ~T-9 sec, peaking at ~T-7 and ~T+2 sec, and ending at ~T+6 sec with a long low tail out to ~T+70 sec (and possibly out to ~T+130 sec). T90 (15-350 keV) is 69 +- 32 sec (estimated error including systematics). The time-averaged spectrum from T-8.27 to T+75.73 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.41 +- 0.22. The fluence in the 15-150 keV band is 1.1 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.73 sec in the 15-150 keV band is 1.3 +- 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/536580/BA/
GCN 13900 table
GRB_name GRB121024A
GCN_number 13900
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 13900 SUBJECT: GRB 121024A: CARMA 3mm Detection DATE: 12/10/25 16:43:05 GMT FROM: Ashley Zauderer at CfA B. Zauderer, T. Laskar and E. Berger (Harvard) report on behalf of the CARMA Key Project "A Millimeter View of the Transient Universe": "We observed the position of GRB 121024A (Pagani et al; GCN 13886) with the Combined Array for Research in Millimeter Astronomy beginning 2012 Oct 25.5 (dt=1.4 d after the burst). At a mean frequency of ~85 GHz, we detect a radio counterpart with a preliminary flux of ~1 mJy within the enhanced Swft/XRT error circle (Osborne et al; GCN 13894) and consistent with the optical afterglow (e.g. Knust et al.; GCN 13891). We thank the CARMA observers and staff for their support. Followup observations are planned."
GCN 13901 table
GRB_name GRB121024A
GCN_number 13901
Detection_method Swift-UVOT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 13901 SUBJECT: GRB 121024A: Swift/UVOT Observations DATE: 12/10/25 20:02:12 GMT FROM: Stephen Holland at STScI S. T. Holland (STScI) and C. Pagani (U Leicester) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 121024A starting 158 s after the BAT trigger (Pagani et al., 2012, GCNC 13886). We continued to detect the optical afterglow until approximately 10 ks after the BAT trigger. Preliminary UVOT photometry, and 3-sigma upper limits, for the afterglow is presented below. ----------------------------------------------------- Filter TSTART TSTOP Exp Time Mag Err ----------------------------------------------------- u (fc) 158 408 246 18.43 0.10 ----------------------------------------------------- v 464 483 19 >18.1 b 413 433 19 18.44 0.25 u 538 557 19 >18.5 uvw1 513 533 19 >18.1 uvm2 488 508 19 >17.6 uvw2 439 459 19 >18.1 ----------------------------------------------------- The quoted magnitudes and upper limits have not been corrected for the Galactic extinction along the line of sight to this burst of E_{B-V} = 0.09 mag (Schlafly et al. 2011, ApJS, 737, 103). The photometry is in the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373).
GCN 13903 table
GRB_name GRB121024A
GCN_number 13903
Detection_method VLA Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 13903 SUBJECT: GRB 121024A: EVLA Detection DATE: 12/10/26 03:54:19 GMT FROM: Tanmoy Laskar at Harvard U T. Laskar, A. Zauderer, and E. Berger (Harvard) report: "We observed the position of GRB 121024A (Pagani et al; GCN 13886) with the EVLA beginning on 2012 Oct 25.3 UT (1.2 days after the burst). At a mean frequency of 22 GHz, we detect a radio counterpart with a preliminary flux density of ~ 0.1 mJy consistent with the enhanced Swft/XRT position (Osborne et al; GCN 13894), the optical position (e.g. Knust et al.; GCN 13891) and the CARMA 3 mm position (Zauderer et al; GCN 13900). Follow-up observations are planned."
GCN 13904 table
GRB_name GRB121024A
GCN_number 13904
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 13904 SUBJECT: GRB 121024A: optical observations DATE: 12/10/26 08:18:43 GMT FROM: Shashi Bhushan Pandey at ROTSE S. B. Pandey and Brajesh Kuamr (ARIES Nainital India, on behalf of larger Indian GRB collaboration). We observed the GRB 121024A field (Pagani et al., GCN 13886) using 1.04m telescope at ARIES Nainital, starting ~16.9 hours after the burst (19:49:49 UT, 2012-10-24). Several frames in R_c and I_c pass-bands were acquired in high air-mass conditions. In our co-added image (6x300 sec) of R_c band, the optical afterglow candidate (Knust et al., GCN 13891) is clearly detected. The preliminary photometry of the co-added frame (calibrated against nearby USNO stars) estimates the magnitude of the optical afterglow to be 21.1 +- 0.1 mag. This massage may be cited.
GCN 13928 table
GRB_name GRB121024A
GCN_number 13928
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 13928 SUBJECT: GRB 121024A: SMARTS optical/IR afterglow observations DATE: 12/10/29 21:00:20 GMT FROM: Bethany Cobb at GWU B. E. Cobb (GWU), reports: Using the ANDICAM instrument on the 1.3m telescope at CTIO, we obtained optical/IR imaging of the error region of GRB 121024A (GCN 13886, Pagani et al.) over several epochs (with mid-exposure times of 2012-10-24 03:51 UT, 06:10 UT, 08:12 UT and 2012-10-25 06:53 UT). For each epoch, several dithered images were obtained with total summed exposure times of 15 min in V and I and 12 min in J and K. For the final epoch, total exposure times were 36 min in I and 30 min in J. The fading afterglow of GRB 121024A (e.g. GCN 13887, Klotz et al.; GCN 13888, Jelinek et al.; GCN 13891, Knust et al.) was detected with the following magnitudes (or 3-sigma limits): mid-exposure time (hours) I mag J mag K mag 0.90722 18.0 +/- 0.1 16.7 +/- 0.1 15.2 +/- 0.2 3.23611 19.4 +/- 0.1 17.9 +/- 0.1 16.3 +/- 0.2 5.27333 19.8 +/- 0.1 > 18.0 > 16.4 27.95278 > 21.9 > 19.3 ... (Optical photometry is calibrated against USNO-B1.0 stars and IR photometry is calibrated against 2MASS stars in the field.)
GCN 13931 table
GRB_name GRB121024A
GCN_number 13931
Detection_method correction
Circular_text TITLE: GCN CIRCULAR NUMBER: 13931 SUBJECT: GRB 121024A: LOAO RIzY Observation DATE: 12/10/30 11:36:05 GMT FROM: Minsung Jang at Seoul National U M. Jang, M. Im (SNU), and Y. Urata (NCU), on behalf of a larger collaboration We observed GRB 121024A in RIzY-bands starting at UT 10:52:00, 2012-10-24, ~ 9 hrs after the BAT trigger (Baumgartner et al, GCN 10484), using the 1.0m telescope at Mt.Lemmon in Arizona, U.S. We do not detect the GRB afterglow in all bands within the error circle of the enhanced XRT position (Evans et al.,GCN 13892). We estimate the 3-sigma limiting magnitude of the afterglow to be R ~ 20.0 at the midpoint time (~T0+9.3 hrs) by calibrating it against seven USNO-B1 stars with R2 magnitudes without the galactic extinction correction. We thank the LOAO operator, J. Yoon, for performing the observation.