GRB150206A

This page lists all entries on GRB150206A in GRBweb

Summary IPN Swift GCN 17413 GCN 17414 GCN 17418 GCN 17419 GCN 17420 GCN 17423 GCN 17424 GCN 17426 GCN 17427

Summary table
Variable Value Source
T0 14:30:02 UTC GCN_circulars,Swift Det
ra 10.0736° Swift
decl -63.1821° Swift
pos_error 1.01e-04° Swift
T90 83.2 s Swift
T90_start 14:30:02 UTC Swift
fluence 1.39e-05 erg/cm² Swift
redshift 2.0870
T100 83.2 s
GBM_located False
mjd 57059.60418981482 GCN_circulars,Swift Det
IPN table
GRB_name GRB150206A
ra 10.0875°
decl -63.1833°
pos_error 5.00e-02°
redshift 2.0870
Swift table
GRB_name GRB150206A
t_trigger 14:30:02 UTC
ra 10.0736°
decl -63.1821°
pos_error 1.01e-04°
T90 83.2 s
fluence 1.39e-05 erg/cm²
redshift 2.0870
GCN 17413 table
GRB_name GRB150206A
GCN_number 17413
Detection_method Swift Det
t_trigger 14:30:02 UTC
ra 10.0880°
decl -63.1820°
Circular_text TITLE: GCN CIRCULAR NUMBER: 17413 SUBJECT: GRB 150206A: Swift detection of a burst with an optical afterglow DATE: 15/02/06 15:05:06 GMT FROM: Scott Barthelmy at NASA/GSFC L. M. Z. Hagen (PSU), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), C. Gronwall (PSU), M.E. Gropp (PSU), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), F. E. Marshall (NASA/GSFC), 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 14:30:02 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 150206A (trigger=630019). Swift did not immediately slew due to observing constraint. The BAT on-board calculated location is RA, Dec 10.088, -63.182, which is RA(J2000) = 00h 40m 21s Dec(J2000) = -63d 10' 53" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a weak beginning with a strong increase starting at ~T+70 sec. The duration is about 150 sec. The peak count rate was ~8000 counts/sec (15-350 keV), at ~97 sec after the trigger. The XRT began observing the field at 14:37:57.3 UT, 474.5 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 10.0774, -63.1852 which is equivalent to: RA(J2000) = +00h 40m 18.58s Dec(J2000) = -63d 11' 06.7" with an uncertainty of 5.1 arcseconds (radius, 90% containment). This location is 20 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 2.35e-09 erg cm^-2 s^-1 (0.2-10 keV). UVOT took a finding chart exposure of 94 seconds with the White filter starting 483 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at RA(J2000) = 00:40:17.66 = 10.07358 DEC(J2000) = -63:10:55.6 = -63.18211 with a 90%-confidence error radius of about 0.78 arc sec. This position is 12.7 arc sec. from the center of the XRT error circle. The estimated magnitude is 18.62 with a 1-sigma error of about 0.16. No correction has been made for the expected extinction corresponding to E(B-V) of 0.02. Burst Advocate for this burst is L. M. Z. Hagen (lea.zernow.hagen 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 17414 table
GRB_name GRB150206A
GCN_number 17414
Detection_method MAXI Det
ra 10.1740°
decl -63.3820°
Circular_text TITLE: GCN CIRCULAR NUMBER: 17414 SUBJECT: GRB 150206A: MAXI/GSC detection DATE: 15/02/06 16:27:56 GMT FROM: H. Negoro at Nihon U. H. Negoro (Nihon U.), S. Ueno, H. Tomida, S. Nakahira, M. Kimura, M. Ishikawa, Y. E. Nakagawa (JAXA), T. Mihara, M. Sugizaki, M. Serino, M. Morii, J. Sugimoto, T. Takagi, A. Yoshikawa, M. Matsuoka (RIKEN), N. Kawai, T. Yoshii, Y. Tachibana (Tokyo Tech), A. Yoshida, T. Sakamoto, Y. Kawakubo, H. Ohtsuki (AGU), H. Tsunemi, D. Uchida (Osaka U.), M. Nakajima, K. Fukushima, T. Onodera, K. Suzuki, M. Fujita, F. Honda, T. Namba (Nihon U.), Y. Ueda, M. Shidatsu, T. Kawamuro, T. Hori (Kyoto U.), Y. Tsuboi, A. Kawagoe (Chuo U.), M. Yamauchi, Y. Morooka, D. Itoh (Miyazaki U.), K. Yamaoka (Nagoya U.) report on behalf of the MAXI team: We report the MAXI/GSC detection of GRB 150206A (Hagen et al. GCN 17413) in the scan transit at 14:50 on 2015 February 06 UT, about 20 min after the BAT trigger. Assuming that the source flux was constant over the transit, we obtain the source position at (R.A., Dec) = (10.174 deg, -63.382 deg) = (00 40 41, -63 22 55) (J2000) with a statistical 90% C.L. elliptical error region with long and short radii of 0.34 deg and 0.28 deg respectively. The roll angle of long axis from the north direction is 82.0 deg counterclockwise. There is an additional systematic uncertainty of 0.1 deg (90% containment radius). The position is consistent with that of GRB 150206A. The X-ray flux averaged over the scan was 116 +- 25 mCrab (4-10keV, 1 sigma error). There was no significant excess flux in the previous transit at UT 13:21 with an upper limit of 20 mCrab.
GCN 17418 table
GRB_name GRB150206A
GCN_number 17418
Detection_method Swift-XRT Det
ra 10.0736°
decl -63.1822°
Circular_text TITLE: GCN CIRCULAR NUMBER: 17418 SUBJECT: GRB 150206A: Enhanced Swift-XRT position DATE: 15/02/07 00:29:43 GMT FROM: Phil Evans at U of Leicester M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team. Using 3576 s of XRT Photon Counting mode data and 11 UVOT images for GRB 150206A, 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 = 10.07362, -63.18223 which is equivalent to: RA (J2000): 00h 40m 17.67s Dec (J2000): -63d 10' 56.0" 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 17419 table
GRB_name GRB150206A
GCN_number 17419
Detection_method GROND
Circular_text TITLE: GCN CIRCULAR NUMBER: 17419 SUBJECT: GRB 150206A: GROND afterglow observations DATE: 15/02/07 02:14:37 GMT FROM: Sebastian Schmidl at TLS Tautenburg T. Schweyer (MPE Garching), S. Schmidl (TLS Tautenburg), and J. Greiner (MPE Garching) report on behalf of the GROND team: We observed the field of GRB 150206A (Swift trigger 630019; Hagen et al., GCN 17413) 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 00:32 UT on February 07, 2015, 10 hrs after the GRB trigger. They were performed at an average seeing of 1.4" and at an average airmass of 1.7. We detect the optical aftergow canditate reported by Hagen et al. (GCN 17413). Based on total exposures of 8.8 minutes in g'r'i'z' and 8.0 minutes in JHK, at a midtime of 10.3 hrs after the burst, we measure the following preliminary magnitudes and upper limits (all AB magnitude system): g' = 22.6 +/- 0.2 mag, r' = 21.9 +/- 0.1 mag, i' = 21.2 +/- 0.1 mag, z' = 20.8 +/- 0.1 mag, J = 20.0 +/- 0.2 mag, H > 20.2 mag, and K > 19.4 mag. The magnitudes are calibrated against GROND zeropoints and 2MASS field stars and are not corrected for the Galactic foreground extinction corresponding to a reddening of E_(B-V)= 0.02 in the direction of the burst (Schlegel et al. 1998).
GCN 17420 table
GRB_name GRB150206A
GCN_number 17420
Detection_method Other
redshift 2.0870
Circular_text TITLE: GCN CIRCULAR NUMBER: 17420 SUBJECT: GRB 150206A: VLT/X-shooter redshift DATE: 15/02/07 03:55:50 GMT FROM: Dong Xu at DARK/NBI T. Kruehler (ESO Chile), D. Xu, J. P. U. Fynbo, D. Malesani (DARK/NBI), Z. Cano (U. Iceland), A. de Ugarte Postigo (IAA-CSIC, DARK/NBI) report on behalf of a larger collaboration: We observed the afterglow of GRB 150206A (Hagen et al. GCN 17413) with the VLT/X-shooter spectrograph, equipped with the UVB/VIS/NIR arms and covering the wavelength range 3000-25000 AA. In a 4x600 s spectrum we detect absorption features of ZnII, FeII, and MgII at a common redshift of z=2.087. The spectral trace is down to ~3760 AA, being consistent with a Lya feature at the same redshift. We thus think this is the redshift of the GRB. We acknowledge excellent support from the observing staff at Paranal, in particular Dimitri Gadotti.
GCN 17423 table
GRB_name GRB150206A
GCN_number 17423
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 17423 SUBJECT: GRB 150206A: Swift-XRT refined Analysis DATE: 15/02/07 10:05:20 GMT FROM: Phil Evans at U of Leicester B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), J.A. Kennea (PSU), V. Mangano (PSU), C. Pagani (U. Leicester), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC) and L.M.Z. Hagen report on behalf of the Swift-XRT team: We have analysed 8.9 ks of XRT data for GRB 150206A (Hagen et al. GCN Circ. 17413), from 464 s to 47.9 ks after the BAT trigger. The data comprise 1.1 ks in Windowed Timing (WT) mode (the first 8 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 17418). The late-time light curve (from T0+6.4 ks) can be modelled with a power-law decay with a decay index of alpha=2.7 (+1.0, -1.2). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.69 (+0.08, -0.07). The best-fitting absorption column is 2.4 (+0.4, -0.3) x 10^21 cm^-2, in excess of the Galactic value of 2.3 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.85 (+0.08, -0.07) and a best-fitting absorption column of 9.6 (+2.1, -2.0) x 10^20 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.6 x 10^-11 (4.2 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 9.6 (+2.1, -2.0) x 10^20 cm^-2 Galactic foreground: 2.3 x 10^20 cm^-2 Excess significance: 6.0 sigma Photon index: 1.85 (+0.08, -0.07) If the light curve continues to decay with a power-law decay index of 2.7, the count rate at T+24 hours will be 2.2 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 8.0 x 10^-14 (9.4 x 10^-14) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00630019. This circular is an official product of the Swift-XRT team.
GCN 17424 table
GRB_name GRB150206A
GCN_number 17424
Detection_method Swift-UVOT Det
ra 10.0735°
decl -63.1821°
Circular_text TITLE: GCN CIRCULAR NUMBER: 17424 SUBJECT: GRB 150206A: Swift/UVOT Detection DATE: 15/02/07 10:26:33 GMT FROM: Samantha Oates at MSSL S. R. Oates (IAA-CSIC/UCL-MSSL) and L. M. Z. Hagen (PSU) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 150206A 483 s after the BAT trigger (Hagen et al., GCN Circ. 17413). A source consistent with the XRT position (Goad et al. GCN Circ. 17418) is detected in the initial UVOT exposures. The preliminary UVOT position is: RA (J2000) = 00:40:17.63 = 10.07346 (deg.) Dec (J2000) = -63:10:55.7 = -63.18214 (deg.) with an estimated uncertainty of 0.52 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 483 577 93 18.76 +/- 0.17 v 2091 6690 201 >18.8 b 2190 2912 255 19.56 +/- 0.22 u 2165 2707 78 >19.0 w1 2140 2683 78 >18.9 w2 2414 6560 216 >19.7 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.02 in the direction of the burst (Schlegel et al. 1998).
GCN 17426 table
GRB_name GRB150206A
GCN_number 17426
Detection_method Swift-BAT Det
ra 10.0760°
decl -63.1810°
Circular_text TITLE: GCN CIRCULAR NUMBER: 17426 SUBJECT: GRB 150206A: Swift-BAT refined analysis DATE: 15/02/07 20:48:22 GMT FROM: Scott Barthelmy at NASA/GSFC S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), L. M. Z. Hagen (PSU), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), 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-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 150206A (trigger #630019) (Hagen, et al., GCN Circ. 17413). The BAT ground-calculated position is RA, Dec = 10.076, -63.181 deg, which is RA(J2000) = 00h 40m 18.1s Dec(J2000) = -63d 10' 50.8" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 48%. The mask-weighted light curve shows a slowly rising level starting at ~T-15 sec, with two strong clusters of peaks at ~T+85 and ~T+98 sec, and returning to baseline at ~T+230 sec. T90 (15-350 keV) is 83.2 +- 7.8 sec (estimated error including systematics). The time-averaged spectrum from T-22.3 to T+164.1 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.33 +- 0.04. The fluence in the 15-150 keV band is 1.39 +- 0.03 x 10^-5 erg/cm2. The 1-sec peak photon flux measured from T+98.82 sec in the 15-150 keV band is 10.1 +- 0.4 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/630019/BA/
GCN 17427 table
GRB_name GRB150206A
GCN_number 17427
Detection_method Konus-Wind Det
t_trigger 14:31:20.265 UTC
redshift 2.0870
Circular_text TITLE: GCN CIRCULAR NUMBER: 17427 SUBJECT: Konus-Wind observation of GRB 150206A DATE: 15/02/09 11:08:41 GMT FROM: Anastasia Tsvetkova at Ioffe Institute S. Golenetskii, R. Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, report: The long-duration GRB 150206A (Swift BAT trigger 630019: Hagen et al., GCN 17413; Barthelmy et al., GCN 17426; MAXI/GSC detection: Negoro et al., GCN 17414) triggered Konus-Wind at T0=52280.265 s UT (14:31:20.265). The burst light curve shows a broad, multi-peaked pulse with a total duration of ~60 s. The emission is seen up to ~10 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB150206_T52280/ As observed by Konus-Wind, the burst had a fluence of 5.52(-0.64,+0.69)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+4.320 s, of 7.92(-1.78,+1.83)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum of the burst (measured from T0 to T0+32.256 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.73(-0.14,+0.18), the high energy photon index beta = -2.20(-0.22,+0.15), the peak energy Ep = 228(-35,+37) keV (chi2 = 74/97 dof) The spectrum near the maximum count rate (measured from T0 to T0+7.680 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.48(-0.17,+0.21), the high energy photon index beta = -2.20(-0.22,+0.15), the peak energy Ep = 242(-35,+38) keV (chi2 = 84/90 dof) Assuming the redshift z=2.087 (Kruehler et al., GCN 17420) and a standard cosmology model with H_0 = 70 km/s/Mpc, Omega_M = 0.27, and Omega_Lambda = 0.73, we estimate the following rest-frame parameters: the isotropic energy release E_iso is 6.0(-0.7,+0.8)x10^53 erg, the peak luminosity L_iso is 2.7(-0.6,+0.6)x10^53 erg/s, and the rest-frame peak energy of the time-integrated spectrum, Ep,i, is 703(-109,+114) keV. All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.