GRB141212A

This page lists all entries on GRB141212A in GRBweb

Summary IPN Swift GCN 17158 GCN 17160 GCN 17161 GCN 17162 GCN 17163 GCN 17164 GCN 17167 GCN 17168 GCN 17169 GCN 17170 GCN 17171 GCN 17172 GCN 17175 GCN 17177 GCN 17178 GCN 17180 GCN 17184 GCN 17185 GCN 17654

Summary table
Variable Value Source
T0 12:14:01 UTC GCN_circulars,Swift Det
ra 39.1248° Swift
decl 18.1470° Swift
pos_error 3.37e-04° Swift
T90 0.3 s Swift
T90_start 12:14:01 UTC Swift
fluence 7.20e-08 erg/cm² Swift
redshift 0.6150
T100 0.3 s
GBM_located False
mjd 57003.509733796294 GCN_circulars,Swift Det
IPN table
GRB_name GRB141212A
ra 39.1625°
decl 18.1500°
pos_error 5.00e-02°
Swift table
GRB_name GRB141212A
t_trigger 12:14:01 UTC
ra 39.1248°
decl 18.1470°
pos_error 3.37e-04°
T90 0.3 s
fluence 7.20e-08 erg/cm²
redshift 0.5960
GCN 17158 table
GRB_name GRB141212A
GCN_number 17158
Detection_method Swift Det
t_trigger 12:14:01 UTC
ra 39.1610°
decl 18.1510°
Circular_text TITLE: GCN CIRCULAR NUMBER: 17158 SUBJECT: GRB 141212A: Swift detection of a short burst DATE: 14/12/12 12:27:37 GMT FROM: Scott Barthelmy at NASA/GSFC T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), N. Gehrels (NASA/GSFC), B.P. Gompertz (U Leicester), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester) and E. Troja (NASA/GSFC/UMCP) report on behalf of the Swift Team: At 12:14:01 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 141212A (trigger=621229). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 39.161, +18.151 which is RA(J2000) = 02h 36m 39s Dec(J2000) = +18d 09' 04" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single spike with a duration of about 0.1 sec. The peak count rate was ~3200 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 12:15:10.0 UT, 69.1 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 39.1246, 18.1460 which is equivalent to: RA(J2000) = 02h 36m 29.90s Dec(J2000) = +18d 08' 45.7" with an uncertainty of 3.5 arcseconds (radius, 90% containment). This location is 125 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. We cannot determine whether the source is fading at the present time. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 1.03 x 10^21 cm^-2 (Willingale et al. 2013). UVOT took a finding chart exposure of 150 seconds with the White filter starting 72 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers none of the XRT error circle. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.10. 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 17160 table
GRB_name GRB141212A
GCN_number 17160
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 17160 SUBJECT: GRB 141212A: MITSuME Akeno upper limits DATE: 14/12/12 13:38:41 GMT FROM: Taketoshi Yoshii at Tokyo Tech T.Fujiwara, T. Yoshii, Y. Saito, Y. Tachibana, H. Ohuchi, Y. Yano, S. Kurita, Y.Ono, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We observed the field of GRB 141212A (T. N. Ukwatta et al. GCN Circular #17158) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan. The observation started on 2014-12-12 12:14:32 UT (31 sec after the burst). We did not find any new point source within XRT circle in all three bands. The measured magnitudes are listed below. T0+[sec] MID-UT T-EXP[sec] g' Rc Ic -------------------------------------------------------------------------------------- 61 12:17:29 240 >19.6 >19.0 >18.3 422 12:28:07 780 >20.0 >19.6 > 18.9 422 12:41:18 2340 >20.5 >20.1 >19.6 -------------------------------------------------------------------------------------- T0+ : Elapsed time after the burst T-EXP: Total Exposure time We used GSC2.3 catalog for flux calibration.
GCN 17161 table
GRB_name GRB141212A
GCN_number 17161
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 17161 SUBJECT: GRB 141212A: Skynet R-COP Observations DATE: 14/12/12 15:14:45 GMT FROM: Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet A. Trotter, J. Haislip, D. Reichart, A. Verveer, T. Spuck, A. Aji, R. Beauchemin, T. Berger, A. Dow, A. Foster, N. Frank, M. Hinckle, K. Ivarsen, A. LaCluyze, M. Maples, J. Moore, M. Nysewander, C. Salemi, L. Zbinden, and J. A. Crain report: Skynet observed the Swift BAT/XRT localization of GRB 141212A (Ukwatta et al., GCN 17158, Swift trigger=621229) with the 14" R-COP telescope at Perth Observatory, Australia. Starting at 2014-12-12 12:24 UT and continuing until 14:13 UT (t=10.2m-119m post-trigger), Skynet took a total of 24x160s exposures in the B, V, R, and I bands. We stacked subsets of these images to maximize the S/N ratio, and detected no optical source in any band at the XRT position. Our 3-sigma limiting magnitudes are: ================================== tmid expos fil limit ================================== 87m 7x160s B >19.9 106m 8x160s V >20.5 41m 3x160s R >20.0 30m 2x80s I >18.5 ================================== Limiting magnitudes are in the Vega System, calibrated to 6 APASS stars in the field. Magnitudes have not been corrected for line-of-sight Milky Way dust extinction, with expected E(B-V)=0.09 (Schlafly & Finkbeiner 2011). No further Skynet observations are scheduled.
GCN 17162 table
GRB_name GRB141212A
GCN_number 17162
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 17162 SUBJECT: GRB 141212A: MASTER early optical observations DATE: 14/12/12 15:16:48 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs O.Gres, K.Ivanov, S.Yazev, N.M.Budnev, V.A.Poleshchuk Irkutsk State University E. Gorbovskoy,V. Lipunov, D.Denisenko, M.Pruzhinskaya, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, D.Zimnukhov, A.Kuznetsov Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory V.Krushinsky, I.Zalozhnih, A. Popov Ural Federal University, Yekaterinburg, Kourovka Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA) MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Tunka was pointed to the GRB141212A 32 sec after notice time and 46 sec after trigger time at 2014-12-12 12:14:47 UT. On our first (10s exposure) set we haven't found optical transient within SWIFT error-box (Ukwatta et alo., GCN 17158) . The 5-sigma upper limit has been about 16.8 mag Our upper limit on first single and coadd images available on table 1: Table 1: T_start T0-T_start T0-T_mid Exptime Limit Coadd UT s s s 12:14:47.1 46 51 10 16.8 - 12:14:47.1 46 497 630 19.2 9 12:30:24.4 983 2251 2160 20.6 12 The message may be cited.
GCN 17163 table
GRB_name GRB141212A
GCN_number 17163
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 17163 SUBJECT: GRB 141212A: Correction to GCN 17162 DATE: 14/12/12 15:25:32 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs Vladimir lipunov (Lomonosow Moscow University) I am sorry. The correct representatio of the Table 1 is: T_start T0-T_start T0-T_mid Exptime Limit Coadd UT s s s 12:14:47.1 46 51 10 16.8 - 12:14:47.1 46 497 630 19.2 9 12:30:24.4 983 2251 2160 20.6 12 The message may be cited.
GCN 17164 table
GRB_name GRB141212A
GCN_number 17164
Detection_method Swift-XRT Det
ra 39.1244°
decl 18.1468°
Circular_text TITLE: GCN CIRCULAR NUMBER: 17164 SUBJECT: GRB 141212A: Enhanced Swift-XRT position DATE: 14/12/12 16:53:25 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 885 s of XRT Photon Counting mode data and 1 UVOT images for GRB 141212A, 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 = 39.12444, +18.14684 which is equivalent to: RA (J2000): 02h 36m 29.86s Dec (J2000): +18d 08' 48.6" with an uncertainty of 2.9 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 17167 table
GRB_name GRB141212A
GCN_number 17167
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 17167 SUBJECT: GRB 141212A: 1.23m CAHA I-band observations DATE: 14/12/12 18:51:16 GMT FROM: Javier Gorosabel at IAA-CSIC J. Gorosabel (IAA-CSIC/UPV-EHU), R. Sanchez-Ramirez (UPV/EHU), S. Hellmich (DLR), S. Mottola (DLR), report on behalf of a larger collaboration: We observed the field of GRB 141212A (Ukwatta et al. GCN Circ. 17158) with the 1.23m CAHA telescope starting on Dec 12.73309 UT (5.4 hours post bust). The observations were carried out in the I-band. No object brighter than I~21 (Vega) is detected within the XRT error circle (Osborne GCN Circ., 17164).
GCN 17168 table
GRB_name GRB141212A
GCN_number 17168
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 17168 SUBJECT: GRB 141212A: Khureltogot optical upper limit DATE: 14/12/12 20:09:31 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), S. Schmalz (AIP), N. Tungalag (Research Center of Astronomy and Geophysics MAS), A. Volnova (IKI), I.Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of GRB 141212A (Ukwatta et al., GCN 17158) with ORI-40 telescope of Khureltogot observatory. We obtained 2 hours of unfiltered images on Dec. 12 starting on (UT) 12:46:14. In a combined image of the first 5 frames we do not detect any optical source within enhanced Swift-XRT position (Osborne et al., GCN 17164). Preliminary photometry is following Date UT start t-T0 Filter Exp. ULimit (3sigma) (mid, days) (s) 2014-12-12 12:46:14 0.02422 R 5*60 18.5 The photometry is based on USNO-B1.0 stars USNO-B1_id RA DEC R2 1081-0038366 039.120895 +18.127567 16.32 1081-0038391 039.149945 +18.154739 17.15 1081-0038340 039.085725 +18.167617 14.41
GCN 17169 table
GRB_name GRB141212A
GCN_number 17169
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 17169 SUBJECT: GRB141212A: xinglong TNT upper limit DATE: 14/12/12 21:58:48 GMT FROM: L.P. Xin at NAOC L. P. Xin, T. M. Zhang, J. Y. Wei, Y. L. Qiu, J. S. Deng, J. Wang, X. H. Han and C. Wu on behalf of EAFON report: We began to observe GRB 141212A (Ukwatta eta l., GCN 17158) with Xinglong 0.8-m TNT telescope at 2014-12-12, 12:14:40(UT), about 39 sec the burst. In any single W-band frame or coadded image, no any new optical transient was detected within XRT circle (Ukwatta eta l., GCN 17158; Osborne et al, GCN 17164 ) down to 3 sigma limit of R~20 mag at the mid-time of 4 min after the burst, calibrated by the nearby USNO B1.0 R2 mag. The message may be cited.
GCN 17170 table
GRB_name GRB141212A
GCN_number 17170
Detection_method Optical
ra 39.1248°
decl 18.1464°
Circular_text TITLE: GCN CIRCULAR NUMBER: 17170 SUBJECT: GRB 141212A: extended object within the XRT error circle DATE: 14/12/12 22:18:17 GMT FROM: Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst D. Malesani (DARK/NBI), P. D'Avanzo (INAF/OABr), V. D'Elia (INAF/OAR and ASI/ASDC), S. D. Vergani (CNRS/GEPI), G. Andreuzzi (INAF/TNG), A. Garcia de Gurtubai Escudero (INAF/TNG), A. Bonomo (INAF/OATo), report on behalf of the CIBO collaboration: We observed the field of GRB 141212A (Ukwatta et al., GCN 17158) using the TNG optical telescope located in La Palma. Observations started on 2014 Dec 12.832 UT (7.73 hr after the GRB) and consisted of 10x240 s in the R band. The PSF in our image was around 1.5". Within the XRT error circle (Osborne et al., GCN 17164; see also http://www.swift.ac.uk/xrt_positions/), we detect a single, extended object (A), with coordinates (J2000): RA = 02:36:29.95 Dec = +18:08:47.2 Its Vega magnitude is R = 22.66 +- 0.23, assuming R = 16.83 for the USNO star at RA = 02:36:35.95, Dec = +18:09:16.8. We cannot yet make any claim about variability, so the connection of this object with GRB 141212A is unclear. This may be the GRB host, though some contribution from an afterglow cannot be excluded. We also note the presence of two extended objects just outside the XRT error circle. (B): RA = 02:36:30.25, Dec = +18:08:50.1, R = 22.29 +- 0.16; (C): RA = 02:36:29.64, Dec = +18:08:50.2, R ~ 24.0 Object (C) is barely detected. No other sources are visibile in the proximity of the XRT error circle down to a limiting magnitude of R = 24. A finding chart can be seen at the following URL: http://www.astro.ku.dk/~malesani/GRB/141212A/GRB141212A_TNG.jpg
GCN 17171 table
GRB_name GRB141212A
GCN_number 17171
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 17171 SUBJECT: GRB 141212A: Swift-XRT refined Analysis DATE: 14/12/13 00:27:05 GMT FROM: Phil Evans at U of Leicester P.A. Evans (U. Leicester), B.P. Gompertz (U. Leicester), V. D'Elia (ASDC), M. de Pasquale (INAF-IASFPA), A. Maselli (INAF-IASFPA), V. Mangano (PSU), M.C. Stroh (PSU), D.N. Burrows (PSU), J.P. Osborne (U. Leicester) and T.N. Ukwatta report on behalf of the Swift-XRT team: We have analysed 7.9 ks of XRT data for GRB 141212A (Ukwatta et al. GCN Circ. 17158), from 77 s to 28.9 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN Circ. 17164). The light curve can be modelled with a power-law decay with a decay index of alpha=0.62 (+0.20, -0.16). If the light curve continues to decay with a power-law decay index of 0.62, the count rate at T+24 hours will be 7.6 x 10^-4 count s^-1 The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00621229. This circular is an official product of the Swift-XRT team.
GCN 17172 table
GRB_name GRB141212A
GCN_number 17172
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 17172 SUBJECT: GRB 141212A: MITSuME Okayama upper limits DATE: 14/12/13 00:54:34 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 MITSuME and OISTER collaboration: We observed the field of GRB 141212A (Ukwatta et al., GCNC 17158) 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 2014-12-12 12:15:02 UT (~62 sec after the burst). We did not find any new point source within the enhanced XRT circle (Osborne et al., GCNC 17164) in all the three bands. 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 ----------------------------------------------------- 0.04216 13:14:42 6000.0 >20.5 >20.1 >19.4 ----------------------------------------------------- T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]
GCN 17175 table
GRB_name GRB141212A
GCN_number 17175
Detection_method Swift-BAT Det
ra 39.1670°
decl 18.1630°
Circular_text TITLE: GCN CIRCULAR NUMBER: 17175 SUBJECT: GRB 141212A: Swift-BAT refined analysis DATE: 14/12/13 05:02:51 GMT FROM: Tilan Ukwatta at MSU D. M. Palmer (LANL), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (LANL) (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 141212A (trigger #621229) (Ukwatta, et al., GCN Circ. 17158). The BAT ground-calculated position is RA, Dec = 39.167, 18.163 deg which is RA(J2000) = 02h 36m 40.1s Dec(J2000) = +18d 09' 47.1" with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 58%. BAT light curve shows a strong FRED like peak starting around T-0.05 sec and ending around T+0.2 sec. Another softer peak can be seen starting at T+0.2 sec, peaking at T+0.3 sec and ending around T+0.35 sec. T90 (15-350 keV) is 0.30 +- 0.08 sec (estimated error including systematics). The time-averaged spectrum from T+0.00 to T+0.34 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.61 +- 0.23. The fluence in the 15-150 keV band is 7.2 +- 1.2 x 10^-08 erg/cm2. The 1-sec peak photon flux measured from T-0.33 sec in the 15-150 keV band is 1.2 +- 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/621229/BA/
GCN 17177 table
GRB_name GRB141212A
GCN_number 17177
Detection_method Swift-BAT Det
redshift 0.6340
Circular_text TITLE: GCN CIRCULAR NUMBER: 17177 SUBJECT: GRB 141212A: Gemini-N spectroscopy and photometry DATE: 14/12/13 07:52:21 GMT FROM: Ryan Chornock at Ohio U R. Chornock (Ohio University), W. Fong (University of Arizona), and D. B. Fox (Penn State) report: We obtained imaging and spectroscopy of the field of the short GRB 141212A (Ukwatta et al., GCN 17158) using GMOS on the 8 m Gemini-North telescope starting at 04:35 UT on 13 December, 16.4 hours after the BAT trigger. In 5x180s of i-band imaging with 0.5" seeing, all three objects found by Malesani et al. (GCN 17170) are well detected. Using an archival calibration, we measure i=22.2 +/- 0.1 mag for object A, the extended object present inside the enhanced XRT error circle (Osborne et al., GCN 17164). In addition, we oriented a spectroscopic slit through both extended objects A and B (using the terminology of Malesani et al.). We obtained 2x900s of spectroscopy with the R400 grating covering the wavelength range 5890-10100 Angs. Both galaxies exhibit prominent nebular line emission from [O II], H-beta, and [O III]. Galaxy A, the likely host, has a redshift of z=0.596, while Galaxy B has a redshift of z=0.672.
GCN 17178 table
GRB_name GRB141212A
GCN_number 17178
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 17178 SUBJECT: GRB 141212A: VLA upper limit DATE: 14/12/13 09:52:03 GMT FROM: Wen-fai Fong at U of Arizona W. Fong (U. Arizona) and B. A. Zauderer (Harvard) report: "We observed the field of the short-duration GRB 141212A (Ukwatta et al., GCN 17158) with the Karl G. Jansky Very Large Array (VLA) beginning on 2014 Dec 12.96 UT (10.9 hr post-burst) at a mean frequency of 6 GHz. In 1 hour of observations, we do not detect any radio source within or around the enhanced XRT position (Osborne et al., GCN 17164). We therefore place a 3-sigma limit of ~25 microJy on the radio afterglow of GRB 141212A at 10.9 hr after the burst. We thank the VLA staff for quickly executing these observations."
GCN 17180 table
GRB_name GRB141212A
GCN_number 17180
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 17180 SUBJECT: GRB 141212A: Swift/UVOT Upper Limits DATE: 14/12/13 10:59:10 GMT FROM: Samantha Oates at MSSL S. R. Oates (IAA-CSIC/UCL-MSSL) and T. N. Ukwatta (LANL) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 141212A 72 s after the BAT trigger (Ukwatta et al., GCN Circ. 17158). No optical afterglow consistent with the XRT position (Osborne et al. GCN Circ. 17164) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white_FC 72 222 147 >20.6 u_FC 286 535 246 >19.9 white 72 1531 392 >21.2 v 615 1581 117 >18.8 b 541 1681 117 >19.8 u 286 1655 343 >20.1 w1 664 1631 117 >19.3 w2 591 1210 39 >18.6 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.10 in the direction of the burst (Schlegel et al. 1998).
GCN 17184 table
GRB_name GRB141212A
GCN_number 17184
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 17184 SUBJECT: GRB 141212A: Zadko observatory - Gingin optical observations DATE: 14/12/13 18:06:06 GMT FROM: Alain Klotz at IRAP-CNRS-OMP A. Klotz, D. Turpin (IRAP-CNRS-OMP), D. Macpherson (UWA/ICRAR), D. Coward (UWA), M. Boer, B. Gendre, K. Siellez, H. Dereli, O. Bardho (UNS-CNRS-OCA), A. Williams (PO-UWA), R. Martin (PO-UWA) report: We imaged the field of GRB 141212A detected by SWIFT (trigger 621229) with the Zadko robotic telescope (D=100cm) located at the observatory - Gingin, Australia. The observations started 123s after the GRB trigger. The elevation of the field increased from 37 degrees above horizon and weather conditions were good. We do not detect any optical counterpart of the XRT afterglow (Ukwatta et al. GCNC 17158, Malesani et al. GCNC 17170). We give the details of the limiting magnitudes during the twelve first minutes after the trigger: t0+123s to t0+153s : Rlim = 18.6 t0+162s to t0+192s : Rlim = 18.6 t0+200s to t0+230s : Rlim = 18.6 t0+239s to t0+269s : Rlim = 18.6 t0+279s to t0+309s : Rlim = 18.6 t0+320s to t0+410s : Rlim = 19.8 t0+421s to t0+511s : Rlim = 19.8 t0+522s to t0+612s : Rlim = 19.8 t0+622s to t0+712s : Rlim = 19.8 We co-added a series of exposures: t0+123s to t0+712s : Rlim = 20.3 Magnitudes were estimated with the nearby NOMAD1 stars and are not corrected for galactic dust extinction.
GCN 17185 table
GRB_name GRB141212A
GCN_number 17185
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 17185 SUBJECT: GRB 141212A iTelescope observation DATE: 14/12/16 09:09:27 GMT FROM: Takanori Sakamoto at AGU D. Kawamura, T. Sakamoto, A. Yoshida (AGU) We observed the field of GRB 141212A detected by Swift (trigger #621229; Ukwatta et al., GCN Circ. 17158) with the iTelescope.Net (http://www.itelescope.net) T11 (0.50 m Plane Wave) telescope located at the New Mexico Skies Observatory (NM, USA). 4 images of 60 sec exposures were taken in the R filter starting from December 12 12:38:28 (UT) about 24.5 minutes after the trigger and stopped on December 12 12:43:22 (UT). We do not detect the optical afterglow both in the individual images and the stacked image at the enhanced X-ray afterglow position (Osborne et al., GCN Circ. 17164). The estimated five sigma upper limit of the combined image (total exposure of 240 sec) is ~19.1 using the USNO-B1 catalog.
GCN 17654 table
GRB_name GRB141212A
GCN_number 17654
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 17654 SUBJECT: GRB 141212A: GMG observation limit DATE: 15/03/29 12:01:02 GMT FROM: Jirong Mao at Yunnan Obs J. Mao, B. Lun and J.-M. Bai (YNAO) report: We observed the field of GRB 141212A (Ukwatta et al., GCN 17158) with the 2.4-meter optical telescope at Gao-Mei-Gu (GMG) station of Yunnan Observatory. Observations began from UT 12:58:57.9 12th, Dec., 2014 (about 45 mins after the trigger). We did not detect any optical source at XRT position down to a limit of R~22.0. In our single image, it is nearly impossible to distinguish the sources clearly identified by Malesani et al. GCN 17170. We thank Dr. D., Malesani for his kind suggestion and discussion. J. Mao apologizes for this very later GCN circular submission.