GRB151215A

This page lists all entries on GRB151215A in GRBweb

Summary IPN Swift GCN 18691 GCN 18692 GCN 18693 GCN 18694 GCN 18695 GCN 18696 GCN 18697 GCN 18698 GCN 18699 GCN 18700 GCN 18702 GCN 18703 GCN 18707 GCN 18708 GCN 19001

Summary table
Variable Value Source
T0 3:01:28 UTC GCN_circulars,Swift Det
ra 93.5844° Swift
decl 35.5159° Swift
pos_error 5.95e-05° Swift
T90 17.8 s Swift
T90_start 3:01:28 UTC Swift
fluence 3.10e-07 erg/cm² Swift
redshift 2.5900
T100 17.8 s
GBM_located False
mjd 57371.12601851852 GCN_circulars,Swift Det
IPN table
GRB_name GRB151215A
ra 93.5958°
decl 35.5167°
pos_error 5.00e-02°
redshift 2.5900
Swift table
GRB_name GRB151215A
t_trigger 3:01:28 UTC
ra 93.5844°
decl 35.5159°
pos_error 5.95e-05°
T90 17.8 s
fluence 3.10e-07 erg/cm²
redshift 2.5900
GCN 18691 table
GRB_name GRB151215A
GCN_number 18691
Detection_method Swift Det
t_trigger 3:01:28 UTC
ra 93.5950°
decl 35.5090°
Circular_text TITLE: GCN CIRCULAR NUMBER: 18691 SUBJECT: GRB 151215A: Swift detection of a burst DATE: 15/12/15 03:14:38 GMT FROM: David Palmer at LANL S. L. Gibson (U Leicester), J. A. Kennea (PSU), K. L. Page (U Leicester), D. M. Palmer (LANL), B. Sbarufatti (INAF-OAB/PSU) and M. H. Siegel (PSU) report on behalf of the Swift Team: At 03:01:28 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 151215A (trigger=667392). Swift slewed to the burst after a short delay due to observing constraints. The BAT on-board calculated location is RA, Dec 93.595, +35.509 which is RA(J2000) = 06h 14m 23s Dec(J2000) = +35d 30' 34" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 5 sec. The peak count rate was ~1300 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 03:04:18.1 UT, 169.1 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 93.58198, 35.51503 which is equivalent to: RA(J2000) = 06h 14m 19.68s Dec(J2000) = +35d 30' 54.1" with an uncertainty of 5.1 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. 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 4.02 x 10^21 cm^-2 (Willingale et al. 2013). UVOT took a finding chart exposure of 150 seconds with the White filter starting 173 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 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. 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 0.40. Burst Advocate for this burst is S. L. Gibson (slg44 AT 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 18692 table
GRB_name GRB151215A
GCN_number 18692
Detection_method Swift-BAT Det
ra 93.5842°
decl 35.5159°
Circular_text TITLE: GCN CIRCULAR NUMBER: 18692 SUBJECT: GRB151215A: P60 Optical Afterglow Candidate DATE: 15/12/15 03:50:49 GMT FROM: S. Bradley Cenko at NASA/GSFC S. B. Cenko (NASA/GSFC) reports on behalf of a larger collaboration: We have imaged the location of GRB151215A (Gibson et al., GCN 18691) with the robotic Palomar 60 inch telescope. Observations began at 3:07 UT (~ 6 minutes after the BAT trigger) and were obtained in the r', i', and z' filters. Just outside the XRT error circle, we find a fading source at (J2000) coordinates: RA: 06:14:20.22 Dec: +35:30:57.2 Using calibration from nearby point sources, we find the object fades from i' = 17.47 +/- 0.05 mag at 3:07 UT to 18.58 +/- 0.15 mag at 3:24 UT. Thus, we believe this quite likely to be the optical afterglow of GRB151215A. Further observations are planned.
GCN 18693 table
GRB_name GRB151215A
GCN_number 18693
Detection_method Swift-XRT Other
ra 93.5840°
decl 35.5162°
Circular_text TITLE: GCN CIRCULAR NUMBER: 18693 SUBJECT: GRB 151215A: Prompt enhanced Swift-XRT position DATE: 15/12/15 03:52:01 GMT FROM: Phil Evans at U of Leicester P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Using promptly downlinked XRT event data for GRB 151215A, we find an enhanced XRT position of the afterglow: RA, Dec: 93.5840, 35.5162 which is equivalent to: RA (J2000) = 06 14 20.17 Dec (J2000) = +35 30 58.3 with an uncertainty of 2.2 arcseconds (radius, 90% confidence). Analysis of the promptly available data is online at http://www.swift.ac.uk/sper/667392. Position enhancement is is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177). This circular is an official product of the Swift-XRT team.
GCN 18694 table
GRB_name GRB151215A
GCN_number 18694
Detection_method GROND
Circular_text TITLE: GCN CIRCULAR NUMBER: 18694 SUBJECT: GRB 151215A: GROND Detection of the Optical/NIR Afterglow DATE: 15/12/15 05:03:48 GMT FROM: Philip Wiseman at MPE/Swift P. Wiseman (MPE Garching), D. A. Kann (TLS Tautenburg), T. Schweyer, and J. Greiner (MPE Garching) report on behalf of the GROND team: We observed the field of GRB 151215A (Swift trigger 667392; Gibson et al., GCN #18691) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at ESO La Silla Observatory (Chile). Observations started at 04:04 UT on 15/12/2015, 63 minutes after the GRB trigger, and are continuing. They were performed at an average seeing of 1.40" and at an average airmass of 2.5. We found a single point source within the 2.2" Swift-XRT error circle reported by Evans et al. (GCN #18693) and consistent with that of Cenko GCN #18692), at: RA (J2000) = 93.58416 = 06:14:20.2 Dec. (J2000) = +35.51596 = +35:30:57.5 with an uncertainty of 0.3" in each coordinate. Based on the first 3.3 min of total exposures in g'r'i'z' and 3.0 min in JHK, we estimate preliminary magnitudes (AB system) of g' = 21.81 +/- 0.09 mag, r' = 20.80 +/- 0.05 mag, i' = 20.44 +/- 0.05 mag, z' = 20.36 +/- 0.07 mag, J = 19.6 +/- 0.2 mag, H = 19.8 +/- 0.5 mag, and K = 18.4 +/- 0.4 mag. Given magnitudes are calibrated against SDSS as well as 2MASS field stars and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.34 mag in the direction of the burst (Schlafly & Finkbeiner et al. 2011).
GCN 18695 table
GRB_name GRB151215A
GCN_number 18695
Detection_method Swift-XRT Det
ra 93.5841°
decl 35.5161°
Circular_text TITLE: GCN CIRCULAR NUMBER: 18695 SUBJECT: GRB 151215A: Enhanced Swift-XRT position DATE: 15/12/15 06:15:51 GMT FROM: Phil Evans at U of Leicester P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team. Using 2236 s of XRT Photon Counting mode data and 2 UVOT images for GRB 151215A, 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 = 93.58409, +35.51608 which is equivalent to: RA (J2000): 06h 14m 20.18s Dec (J2000): +35d 30' 57.9" with an uncertainty of 1.9 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 18696 table
GRB_name GRB151215A
GCN_number 18696
Detection_method Optical
ra 93.5830°
decl 35.5183°
redshift 2.5900
Circular_text TITLE: GCN CIRCULAR NUMBER: 18696 SUBJECT: GRB 151215A: NOT spectroscopy and redshift DATE: 15/12/15 10:15:44 GMT FROM: Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst D. Xu (NAOC/CAS), N. R. Tanvir (Univ. Leicester), D. Malesani (DARK/NBI), J. P. U. Fynbo (DARK/NBI), P. Jakobsson (Univ. Iceland), J. Saario (NOT and Univ. Turku) report on behalf of a larger collaboration: We observed the optical afterglow (Cenko, GCN 18692; Wiseman et al., GCN 18694) of GRB 151215A (Gibson et al., GCN 18691) using the Nordic Optical Telescope (NOT) equipped with the AlFOSC camera and spectrograph. The optical afterglow is clearly visible in our images, and we measure its brightness on Dec 15.160 UT (0.81 hr after the GRB) to be R = 20.07 +- 0.02 (Vega, assuming R = 16.31 for the USNO star at RA = 06:14:19.93, Dec = +35:31:06.0). A sequence of three spectra of 1200 s each was carried out starting on Dec 15.176 UT (1.2 hr after the trigger), covering the wavelength range 3200-9000 AA. A wide trough is visible superimposed on the afterglow continuum, indicating Lyalpha absorption from neutral hydrogen. We also detect several narrow absorption features, which we interpret as due to, e.g., Si II, O I, Al II, all at a common redshift of z = 2.59. A preliminary fit to the Lyalpha profile yields an HI column density of 3x10^21 cm^-2, though establishing the system as a DLA.
GCN 18697 table
GRB_name GRB151215A
GCN_number 18697
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 18697 SUBJECT: GRB 151215A: MASTER early OT detection and light curve DATE: 15/12/15 12:19:35 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs R. Rebolo, M. Serra-Ricart, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias E. Gorbovskoy, V. Lipunov, N.Tyurina, D. Vlasenko, V.Kornilov, P.Balanutsa, A.Kuznetsov, D. Vlasenko Lomonosov Moscow State University, Sternberg Astronomical Institute O. Gress, K. Ivanov, N.M. Budnev, V.A. Poleshchuk, S.A. Yazev Irkutsk State University V.Yurkov, Yu.Sergienko, A.Gabovich, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk report on behalf of the MASTER Team: MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru, Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 34917111) located in IAC was pointed to the GRB151215A (Gibson et al. GCN 18691) 18 sec after notice time and 33 sec after trigger time at 2015-12-15 03:02:05 UT with 10s exposition in two perpendicular polarization planes. We detect OT (Cenko et al GCN 18691, Wiseman et al. GCN 18694) in first image with magnitude 17.8 +- 0.5 at a growing stage (midle time 38 sec after trigger). We definetely see OT on all images till 1500-th second. The GRB optical light curve have a maximum at third image (110 s after triger time) with 17.0 +- 0.1 mag. The automatic light curve in one polarization available here http://master.sai.msu.ru/static/GRB151215A_v1.png All magnitudes are unfiltered (0.2B+0.8R) with respect to number USNO B1.0 stars. This is preliminary results. The message may be cited.
GCN 18698 table
GRB_name GRB151215A
GCN_number 18698
Detection_method Swift-UVOT Det
ra 93.5844°
decl 35.5159°
redshift 2.6000
Circular_text TITLE: GCN CIRCULAR NUMBER: 18698 SUBJECT: GRB151215A: Swift/UVOT detection DATE: 15/12/15 16:28:33 GMT FROM: Massimiliano de Pasquale at IASF-Palermo M. De Pasquale (UCL-MSSL) and S. L. Gibson (U Leicester) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 151215A 174 s after the BAT trigger (Gibson et al., GCN Circ. 18691). We detect the optical afterglow of GRB151215A within the XRT error circle (Evans et al. GCN Circ. 18695), in the initial UVOT exposures. The preliminary UVOT position is: RA (J2000) = 06:14:20.25 = 93.58438 (deg.) Dec (J2000) = +35:30:57.4 = 35.51595 (deg.) with an estimated uncertainty of 0.46 arc sec. (radius, 90% confidence). The position of this source is consistent with those given by Cenko et al. (GCN Circ. 18692) and GROND (Wiseman et al. GCN Circ. 18694). There is no detection in UVOT uv filters, which is congruous with the redshift z=2.6 of the event (Xu et al., GCN circ. 18696). 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 (Finding Chart) 174 323 147 19.05 ± 0.14 white 531 2586 362 20.59 ± 0.19 v 408 2636 253 19.67 ± 0.35 b 507 2561 233 20.85 ± 0.42 u 482 2536 233 >20.3 w1 458 2512 233 >19.9 m2 433 2651 225 >19.6 w2 384 2612 253 >19.9 The magnitudes in the table are not corrected for the substantial Galactic extinction due to the reddening of E(B-V) = 0.39 in the direction of the burst (Schlegel et al. 1998). -- Dr. Massimiliano De Pasquale Research associate - Swift UVOT scientist Mullard Space Science Laboratory, University College London
GCN 18699 table
GRB_name GRB151215A
GCN_number 18699
Detection_method Swift-BAT Det
ra 93.6220°
decl 35.5290°
Circular_text TITLE: GCN CIRCULAR NUMBER: 18699 SUBJECT: GRB 151215A: Swift-BAT refined analysis DATE: 15/12/15 22:29:18 GMT FROM: Tilan Ukwatta at LANL J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), N. Gehrels (GSFC), S. L. Gibson (U Leicester) H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-240 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 151215A (trigger #667392) (Gibson, et al., GCN Circ. 18691). The BAT ground-calculated position is RA, Dec = 93.622, 35.529 deg which is RA(J2000) = 06h 14m 29.3s Dec(J2000) = +35d 31' 45.0" with an uncertainty of 2.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 51%. The mask-weighted light curve shows a multi-peak episode starting ~T-15 sec, highest peak at ~T+0 sec, and the episode ends around ~T+5 sec. T90 (15-350 keV) is 17.8 +- 1.0 sec (estimated error including systematics). The time-averaged spectrum from T-15.46 to T+3.13 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.99 +- 0.33. The fluence in the 15-150 keV band is 3.1 +- 0.7 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T-0.16 sec in the 15-150 keV band is 1.6 +- 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/667392/BA/
GCN 18700 table
GRB_name GRB151215A
GCN_number 18700
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 18700 SUBJECT: GRB 151215A: Swift-XRT refined Analysis DATE: 15/12/16 03:14:03 GMT FROM: Phil Evans at U of Leicester J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), A. Maselli (INAF-IASFPA), L.M. McCauley (PSU), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU) and S.L. Gibson report on behalf of the Swift-XRT team: We have analysed 7.4 ks of XRT data for GRB 151215A (Gibson et al. GCN Circ. 18691), from 180 s to 35.7 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN Circ. 18693). The light curve can be modelled with a power-law decay with a decay index of alpha=0.88 (+0.07, -0.06). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.21 (+0.18, -0.17). The best-fitting absorption column is consistent with the Galactic value of 4.0 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.5 x 10^-11 (6.2 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Galactic foreground: 4.0 x 10^21 cm^-2 Intrinsic column: 4 (+/-12) x 10^21 cm^-2 at z=2.59 Photon index: 2.21 (+0.18, -0.17) If the light curve continues to decay with a power-law decay index of 0.88, the count rate at T+24 hours will be 3.6 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.2 x 10^-13 (2.2 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/00667392. This circular is an official product of the Swift-XRT team.
GCN 18702 table
GRB_name GRB151215A
GCN_number 18702
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 18702 SUBJECT: GRB 151215A: MITSuME Akeno optical upper limits DATE: 15/12/16 11:13:41 GMT FROM: Taketoshi Yoshii at Tokyo Tech Y.Muraki, T.Fujiwara, T. Yoshii, Y. Saito, Y. Tachibana, Y.Yano, S.Harita, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We searched for the optical counterpart of GRB 151215A (S. L. Gibson et al., GCN Circular #18691) 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 2015-12-15 16:23:38 UT (~13.4 h after the burst). We did not find any new point source within Swift/XRT circle in all three bands. We obtained following limits for the magnitudes. T0+[sec] MID-UT T-EXP[sec] g' Rc Ic ------------------------------------------------------------- 48230 17:48:09 5070 > 20.9 > 20.6 > 19.6 ------------------------------------------------------------- T0+ : Elapsed time after the burst T-EXP: Total Exposure time We used GSC2.3 catalog for flux calibration.
GCN 18703 table
GRB_name GRB151215A
GCN_number 18703
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 18703 SUBJECT: GRB151215A: Early optical light curve from pt5m, La Palma DATE: 15/12/16 15:03:14 GMT FROM: Liam K Hardy at U of Shffield L. K. Hardy (Sheffield), S. P. Littlefair (Sheffield), V. S. Dhillon (Sheffield, IAC), T. Butterley (Durham) and R. W. Wilson (Durham) report: The automated robotic telescope 'pt5m' (Hardy et al. 2015, MNRAS 454, 4316) on La Palma observed the field of GRB 151215A (Gibson et al., GCN 18691) starting at 03:02:42 UT on Dec 15, 53 seconds after the alert notice release and 74 seconds after the GRB detection. Observations comprised of 59 x 60-second exposures in the Johnson/Cousins R-band with approximately 6-seconds dead time between images. The final image was taken 65 minutes after the first. We detect the optical counterpart to the GRB and observe a rapidly declining light curve. Photometry is performed using historical instrumental zeropoints. We measure an initial magnitude of R = 17.13 +/- 0.04 (2 minutes after the GRB) and a final magnitude of R = 20.8 +/- 0.7 (67 minutes after the GRB). The light curve is available at: http://slittlefair.staff.shef.ac.uk/images/grb151215.png
GCN 18707 table
GRB_name GRB151215A
GCN_number 18707
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 18707 SUBJECT: GRB151215A: Continued P60 Observations DATE: 15/12/17 15:30:18 GMT FROM: S. Bradley Cenko at NASA/GSFC S. B. Cenko (NASA/GSFC) and D. A. Perley (DARK/NBI) report on behalf of a larger collaboration: We imaged the field of the optical afterglow (Cenko et al., GCN 18692) of GRB151215A (Gibson et al., GCN 18691) with the robotic Palomar 60 inch telescope. Observations were obtained in the r', i', and z' filters beginning at 3:41 UT on 16 December 2015 (1.0 d after the Swift trigger). We do not detect any emission at the location of the afterglow in any filter. Using nearby point sources from SDSS for calibration, we calculate an upper limit of i' > 21.7 mag at a mean epoch of 1.04 d after the burst.
GCN 18708 table
GRB_name GRB151215A
GCN_number 18708
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 18708 SUBJECT: GRB 151215A: TSHAO optical observations DATE: 15/12/17 17:16:14 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), I. Reva (Fesenkov Astrophysical Institute), A. Kusakin (Fesenkov Astrophysical Institute), A. Volnova (IKI), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of GRB 151215A (Gibson et al., GCN 18691) with Zeiss-1000 (East) 1-m telescope of Tien Shan Astronomical Observatory starting on Dec. 15 (UT) 16:47:23. We obtained several images in R filter. The afterglow (Cenko, GCN 18692) is detected in a combined image. Preliminary photometry of the afterglow is following Date UT start t-T0 Filter Exp. OT Err (mid, days) (s) 2015-12-15 16:47:23 0.61190 R 21*300 22.1 0.3 The photometry is based on nearby SDSS stars. GRB 151215A observatory TSHAO date 2015-12-15 UT start 16:47:23.69 t-T0 0.61190 d exptime 21*300 s filter R OT 22.07 +/- 0.38 (вычитанием потоков) uplim 22.4 fwhm 2.4 "
GCN 19001 table
GRB_name GRB151215A
GCN_number 19001
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 19001 SUBJECT: GRB 151215A: TAROT Calern observatory very early optical detection DATE: 16/02/07 22:36:40 GMT FROM: Alain Klotz at IRAP-CNRS-OMP Klotz A., Turpin D., Atteia J.L. (CNRS-OMP-IRAP), Boer, M., Laugier, R. (CNRS-ARTEMIS), Gendre B. (UVI - Etelman Obs.) report: We imaged the field of GRB 151215A detected by SWIFT (trigger 667392) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France. The observations started 31.6s after the GRB trigger (17.7s after the notice). The elevation of the field decreased from 56 degrees above horizon and weather conditions were good but images were slightly unfocused. The first image is trailed with a duration of 60.0s (see the description in Klotz et al., 2006, A&A 451, L39). Due to the unfocused condition, we took time to reprocess the image to extract the magnitude of the optical transient discovered by Cenko et al. (GCNC 18692): t1(s) t2(s) Rmag d_Rmag 31.6 44.5 17.3 0.5 44.5 91.6 16.7 0.3 Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.