GRB170205A

This page lists all entries on GRB170205A in GRBweb

Summary IPN Swift GCN 20603 GCN 20605 GCN 20609 GCN 20610 GCN 20611 GCN 20612 GCN 20613 GCN 20614 GCN 20615

Summary table
Variable Value Source
T0 12:39:09 UTC GCN_circulars,Swift Det
ra 262.1695° Swift
decl -0.0631° Swift
pos_error 5.57e-05° Swift
T90 26.1 s Swift
T90_start 12:39:09 UTC Swift
fluence 3.80e-06 erg/cm² Swift
T100 26.1 s
GBM_located False
mjd 57789.5271875 GCN_circulars,Swift Det
IPN table
GRB_name GRB170205A
ra 262.1500°
decl -0.0500°
pos_error 5.00e-02°
Swift table
GRB_name GRB170205A
t_trigger 12:39:09 UTC
ra 262.1695°
decl -0.0631°
pos_error 5.57e-05°
T90 26.1 s
fluence 3.80e-06 erg/cm²
GCN 20603 table
GRB_name GRB170205A
GCN_number 20603
Detection_method Swift Det
t_trigger 12:39:09 UTC
ra 262.1510°
decl -0.0530°
Circular_text TITLE: GCN CIRCULAR NUMBER: 20603 SUBJECT: GRB 170205A: Swift detection of a burst with an optical counterpart DATE: 17/02/05 12:58:40 GMT FROM: David Burrows at PSU/Swift E. Troja (NASA/GSFC/UMCP), D. N. Burrows (PSU), A. Cholden-Brown (PSU), H. A. Krimm (CRESST/NSF/USRA), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC) and K. L. Page (U Leicester) report on behalf of the Swift Team: At 12:39:09 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 170205A (trigger=736843). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 262.151, -0.053 which is RA(J2000) = 17h 28m 36s Dec(J2000) = -00d 03' 08" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a double-peaked structure with a duration of about 25 sec. The peak count rate was ~5000 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 12:40:10.9 UT, 61.1 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source with an enhanced position: RA, Dec 262.1696, -0.0626 which is equivalent to: RA(J2000) = 17h 28m 40.70s Dec(J2000) = -00d 03' 45.3" with an uncertainty of 2.2 arcseconds (radius, 90% containment). This location is 75 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 (1.97 x 10^21 cm^-2, Willingale et al. 2013), with an excess column of 6.4 (+5.93/-4.46) x 10^21 cm^-2 (90% confidence). The initial flux in the 2.5 s image was 7.05e-09 erg cm^-2 s^-1 (0.2-10 keV). UVOT took a finding chart exposure of 150 seconds with the White filter starting 314 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at RA(J2000) = 17:28:40.69 = 262.16953 DEC(J2000) = -00:03:47.3 = -0.06313 with a 90%-confidence error radius of about 0.62 arc sec. This position is 1.9 arc sec. from the center of the XRT error circle. The estimated magnitude is 17.62 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.35. Burst Advocate for this burst is E. Troja (eleonora.troja AT nasa.gov). 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 20605 table
GRB_name GRB170205A
GCN_number 20605
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 20605 SUBJECT: GRB 170205A: LCO FTN observations DATE: 17/02/05 16:16:18 GMT FROM: Cristiano Guidorzi at Ferrara U,Italy C. Guidorzi (U. Ferrara), S. Kobayashi, I.A. Steele (LJMU), A. Gomboc (U. Nova Gorica), C.G. Mundell (U. Bath) on behalf of a large collaboration report: We observed Swift GRB 170205A (Troja et al. GCN 20603) on February 05, from 14:40 UT (2.0 hours since the GRB) with the 2-m LCO FTN in Hawaii with SDSS r and i filters. We detect the optical afterglow at the Swift-UVOT position with the following values: Mid Time Exposure Filter Magnitude (AB) (hours) (s) ------------------------------------------------------- 2.0 2x120 SDSS-R 20.3 +- 0.1 2.1 2x120 SDSS-I 20.0 +- 0.1 ------------------------------------------------------- as calibrated against nearby SDSS sources.
GCN 20609 table
GRB_name GRB170205A
GCN_number 20609
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 20609 SUBJECT: GRB 170205A: RATIR Optical and NIR Observations DATE: 17/02/05 19:35:56 GMT FROM: Nat Butler at Az State U Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UVI), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jesús González (UNAM), Carlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report: We observed the field of GRB 170205A (Troja, et al., GCN 20603) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir from 2017/02 5.53 to 2017/02 5.58 UTC (2.3 minutes to 1.25 hours after the BAT trigger), obtaining a total of 0.61 hours exposure in the r and i bands and 0.29 hours exposure in the Z and Y bands. In comparison with the USNO-B1 and 2MASS catalogs, we obtain the following detections for the optical afterglow (see, also, Guidorzi, et al., GCN 20605): r = 18.31 +/- 0.01 i = 17.90 +/- 0.01 Z = 18.06 +/- 0.01 Y = 19.26 +/- 0.07 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. The source fades (from i~16 mag) as t^(-1.6) until ~15 minutes after the GRB, after which the fade flattens to t^(-1.1). We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.
GCN 20610 table
GRB_name GRB170205A
GCN_number 20610
Detection_method Swift-XRT Det
ra 262.1693°
decl -0.0632°
Circular_text TITLE: GCN CIRCULAR NUMBER: 20610 SUBJECT: GRB 170205A: Enhanced Swift-XRT position DATE: 17/02/05 21:51:08 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 2830 s of XRT Photon Counting mode data and 4 UVOT images for GRB 170205A, 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 = 262.16934, -0.06320 which is equivalent to: RA (J2000): 17h 28m 40.64s Dec (J2000): -00d 03' 47.5" 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 20611 table
GRB_name GRB170205A
GCN_number 20611
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 20611 SUBJECT: GRB 170205A: Swift-XRT refined Analysis DATE: 17/02/06 05:18:00 GMT FROM: Phil Evans at U of Leicester V. D'Elia (ASDC), A. Cholden-Brown (PSU), S. J. LaPorte (PSU), J.A. Kennea (PSU), P.A. Evans (U. Leicester), S.L. Gibson (U. Leicester), J.P. Osborne (U. Leicester), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB) and E. Troja report on behalf of the Swift-XRT team: We have analysed 10 ks of XRT data for GRB 170205A (Troja et al. GCN Circ. 20603), from 271 s to 34.9 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 20610). The light curve can be modelled with a power-law decay with a decay index of alpha=0.89 (+0.03, -0.04). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.87 (+0.14, -0.13). The best-fitting absorption column is 3.4 (+0.7, -0.6) x 10^21 cm^-2, in excess of the Galactic value of 2.0 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 4.1 x 10^-11 (5.7 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 3.4 (+0.7, -0.6) x 10^21 cm^-2 Galactic foreground: 2.0 x 10^21 cm^-2 Excess significance: 3.8 sigma Photon index: 1.87 (+0.14, -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 0.021 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 8.5 x 10^-13 (1.2 x 10^-12) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00736843. This circular is an official product of the Swift-XRT team.
GCN 20612 table
GRB_name GRB170205A
GCN_number 20612
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 20612 SUBJECT: GRB 170205A: NOT afterglow observations DATE: 17/02/06 11:00:35 GMT FROM: Thomas Kruehler at MPE Garching T. Kruehler (MPE Garching), D. Xu (NAOC,CAS), K. E. Heintz (Univ. Iceland & DARK/NBI) and G. Fedorets (NOT) report on behalf of the Nordic GRB collaboration: We observed the field of GRB 170205A (Troja et al. GCN 20603) with the NOT equipped with ALFOSC. Photometry in the r and i-band started at 05:49 UTC on 2017-02-06, 17.2 hr after the GRB trigger, and was obtained under adverse atmospheric conditions (seeing around 2.5"). Calibrating our images against magnitudes of field stars from the SDSS catalog, we measure preliminary brightnesses of the optical afterglow (Troja et al. GCN 20603, Guidorzi et al. GCN 20605, Butler et al. GCN 20609) of r = 22.2 +- 0.2 mag and i = 22.0 +- 0.2 mag. These magnitudes are not corrected for the expected foreground extinction corresponding to a reddening of E_B-V = 0.30 mag (Schlafly & Finkbeiner 2011).
GCN 20613 table
GRB_name GRB170205A
GCN_number 20613
Detection_method Swift-BAT Det
ra 262.1570°
decl -0.0580°
Circular_text TITLE: GCN CIRCULAR NUMBER: 20613 SUBJECT: GRB 170205A: Swift-BAT refined analysis DATE: 17/02/06 14:52:41 GMT FROM: Hans Krimm at NSF/NASA-GSFC H. A. Krimm (NSF/USRA), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), N. Gehrels (GSFC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), E. Troja (NASA/GSFC/UMCP), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-10 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 170205A (trigger #736843) (Troja, et al., GCN Circ. 20603). The BAT ground-calculated position is RA, Dec = 262.157, -0.058 deg which is RA(J2000) = 17h 28m 37.8s Dec(J2000) = -00d 03' 30.4" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 91%. The mask-weighted light curve shows that the burst consisted of two peaks of roughly equal peak counts, the first from T-2 sec to T+12 sec and the second from T+12 sec to T+30 sec. T90 (15-350 keV) is 26.1 +- 3.2 sec (estimated error including systematics). It is possible that the burst is longer than this since there was no data before T-10 seconds, following the re-enabling of data collection after an SAA passage. The time-averaged spectrum from T-1.42 to T+46.40 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.85 +- 0.06. The fluence in the 15-150 keV band is 3.8 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-0.30 sec in the 15-150 keV band is 4.3 +- 0.3 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/736843/BA/
GCN 20614 table
GRB_name GRB170205A
GCN_number 20614
Detection_method Konus-Wind Det
t_trigger 12:39:09.824 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 20614 SUBJECT: Konus-Wind observation of GRB 170205A DATE: 17/02/06 16:19:11 GMT FROM: Dmitry Svinkin at Ioffe Institute D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, P. Oleynik, M. Ulanov, A. Tsvetkova, A. Lysenko, A. Kozlova, and T. Cline on behalf of the Konus-Wind team, report: The long-duration GRB 170205A (Swift-BAT detection: Troja et al., GCN Circ. 20603), triggered Konus-Wind at T0=45549.824 s UT (12:39:09.824). The burst light curve shows a double-peaked structure which started at ~T0-32 s and had a total duration of ~56 s. The emission is seen up to ~1 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB170205_T45549/ As observed by Konus-Wind, the burst had a fluence of 1.22(-0.20,+0.24)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0-0.220 s, of 3.29(-1.62,+1.99)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+24.832 s) is best fit in the 20 keV - 10 MeV range by a power law with spectral index = -2.19(-0.12,+0.13) (chi2 = 58/69 dof). Fitting this spectrum by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) yields alpha = -1.75 (-0.24,+0.62) and an upper limit on Ep of 75 keV (chi2 = 56/68 dof). For the CPL model, the burst fluence is 6.2(-0.8,+1.4)x10^-6 erg/cm2, and the 64-ms peak flux is 1.8(-0.8,+2.8)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range). All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
GCN 20615 table
GRB_name GRB170205A
GCN_number 20615
Detection_method Swift-UVOT Det
ra 262.1695°
decl -0.0631°
Circular_text TITLE: GCN CIRCULAR NUMBER: 20615 SUBJECT: GRB 170205A: Swift/UVOT Detection of a Fading Afterglow DATE: 17/02/06 16:33:17 GMT FROM: Sam Emery at MSSL-UCL S.W.K. Emery (UCL-MSSL), E. Troja (NASA/GSFC/UMCP) and A.A. Breeveld (UCL-MSSL) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 170205A 314 s after the BAT trigger (Troja et al., GCN Circ. 20603). A source consistent with the XRT position (Beardmore et al. GCN Circ. 20610) and also detected by Guidorzi et al. GCN 20605, Butler et al. GCN 20609 and Kruehler et al. GCN 20612 is detected in the initial UVOT exposures. The preliminary UVOT position is: RA (J2000) = 17:28:40.69 = 262.16955 (deg.) Dec (J2000) = -00:03:47.3 = -0.06313 (deg.) with an estimated uncertainty of 0.43 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(FC) 314 464 147 17.52 +/- 0.04 u(FC) 520 540 19 17.30 +/- 0.22 white 4361 4561 197 20.84 +/- 0.33 v 619 17292 1101 >20.3 b 545 565 19 17.79 +/- 0.24 u 3951 12169 785 20.65 +/- 0.33 w1 496 10592 924 >20.6 m2 6287 17909 741 >20.6 w2 4567 16378 1082 >21.1 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.35 in the direction of the burst (Schlegel et al. 1998).