GRB170214A

This page lists all entries on GRB170214A in GRBweb

Summary Fermi GBM IPN Fermi LAT GCN 20675 GCN 20676 GCN 20677 GCN 20678 GCN 20679 GCN 20681 GCN 20682 GCN 20683 GCN 20684 GCN 20685 GCN 20686 GCN 20687 GCN 20691

Summary table
Variable Value Source
GRB_name_Fermi GRB170214649
T0 15:34:25.920 UTC Fermi_LAT
ra 256.3413° Fermi_LAT
decl -1.8877° Fermi_LAT
pos_error 1.94e-04° Fermi_LAT
T90 122.882 s Fermi_GBM
T90_error 0.724 s Fermi_GBM
T90_start 15:34:39.468 UTC Fermi_GBM
fluence 1.77e-04 erg/cm² Fermi_GBM
fluence_error 1.27e-07 erg/cm² Fermi_GBM
redshift 2.5300
T100 136.43 s
GBM_located False
mjd 57798.64891111111 Fermi_LAT
Fermi GBM table
GRB_name_Fermi GRB170214649
trigger_name bn170214649
ra 256.3300°
decl -1.8800°
pos_error 2.52e+00°
datum 2017-02-14
t_trigger 15:34:26.924 UTC
T90 122.882 s
T90_error 0.724 s
T90_start 15:34:39.468 UTC
fluence 1.77e-04 erg/cm²
fluence_error 1.27e-07 erg/cm²
flux_1024 1.84e+01 erg/cm²/s
flux_1024_error 4.23e-01 erg/cm²/s
flux_1024_time 6.17e+01 erg/cm²/s
flux_64 2.37e+01 erg/cm²/s
flux_64_error 1.83e+00 erg/cm²/s
IPN table
GRB_name GRB170214A
ra 256.3292°
decl -1.8833°
pos_error 8.00e-02°
redshift 2.5300
Fermi LAT table
GRB_name_Fermi GRB170214649
GRB_name GRB170214A
MET 508779269.92
datum 2017-02-14
t_trigger 15:34:25.920 UTC
ra 256.3413°
decl -1.8877°
pos_error 1.94e-04°
GCN 20675 table
GRB_name GRB170214A
GCN_number 20675
Detection_method Fermi GBM Det
t_trigger 15:34:26.920 UTC
ra 255.6100°
decl -5.7800°
Circular_text TITLE: GCN CIRCULAR NUMBER: 20675 SUBJECT: GRB 170214A: Fermi GBM detection DATE: 17/02/14 22:26:42 GMT FROM: Bagrat Mailyan at UAH B. Mailyan and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 15:34:26.92 UT on 14 February 2017, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 170214A (trigger 508779271 / 170214649). The on-ground calculated location, using the GBM trigger data, is RA = 255.61, DEC = -5.78 (J2000 degrees), equivalent to J2000 17h 02m, -05d 46', with an uncertainty of 1 degree (radius, 1-sigma containment, statistical only; there is additionally a systematic error which we have characterized as a core-plus-tail model, with 90% of GRBs having a 3.7 deg error and a small tail suffering a larger than 10 deg systematic error. [Connaughton et al. 2015, ApJS, 216, 32] ). The trigger resulted in an Autonomous Repoint Request (ARR) by the GBM Flight Software owing to the high peak flux of the GRB. This ARR was accepted and the spacecraft slewed to the GBM in-flight location. The initial angle from the Fermi LAT boresight to the GBM ground location is 29 degrees. The GBM light curve shows multiple overlaping peaks with a duration (T90) of about 123 s (50-300 keV). The time-averaged spectrum from T0+12.8 s to T0+136.7 s is best fit by a Band function with Epeak = 408.50 +/- 9.09 keV, alpha = -0.84 +/- 0.01, and beta = -2.34 +/- 0.05. The event fluence (10-1000 keV) in this time interval is (1.8 +/- 0.002)E-4 erg/cm^2. The 1-sec peak photon flux measured starting from T0+61.7 s in the 10-1000 keV band is 17.8 +/- 0.4 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN 20676 table
GRB_name GRB170214A
GCN_number 20676
Detection_method Fermi LAT Det
t_trigger 15:34:26.920 UTC
ra 256.3300°
decl -1.8800°
Circular_text TITLE: GCN CIRCULAR NUMBER: 20676 SUBJECT: GRB 170214A: Fermi-LAT detection DATE: 17/02/15 00:13:48 GMT FROM: Judith Racusin at GSFC J. L. Racusin (NASA/GSFC), G. Vianello (Stanford), and J. Perkins (NASA/GSFC), report on behalf of the Fermi-LAT team: At 15:34:26.92 on February 14, 2017, Fermi-LAT detected high-energy emission from GRB 170214A, which was also detected by Fermi-GBM (trigger 508779271 / 170214649, Mailyan et al., GCN 20675). The best LAT on-ground location is found to be RA, Dec: 256.33, -1.88 (degrees, J2000) with an error radius of 0.08 deg (90% containment, statistical error only). This was 33 deg from the LAT boresight at the time of the trigger, and triggered an autonomous repoint of the spacecraft. The data from the Fermi-LAT show a significant increase in the event rate that is spatially and temporally correlated with the GBM emission with high significance. More than 160 photons above 100 MeV and more than 13 photons above 1 GeV are observed within 1000 seconds. The highest- energy photon is a 7.8 GeV event which is observed ~105 seconds after the GBM trigger. A Swift ToO has been approved for this burst. The Fermi-LAT point of contact for this burst is Judith Racusin (judith.racusin@nasa.gov). The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.
GCN 20677 table
GRB_name GRB170214A
GCN_number 20677
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 20677 SUBJECT: GRB 170214A: Swift ToO observations DATE: 17/02/15 02:17:33 GMT FROM: Phil Evans at U of Leicester P. A. Evans (U. Leicester) reports on behalf of the Swift team: Swift has initiated a ToO observation of the Fermi/LAT GRB 170214A. Automated analysis of the XRT data will be presented online at http://www.swift.ac.uk/ToO_GRBs/00020740 Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. These are not necessarily related to the Fermi/LAT event. Any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration. Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8). This circular is an official product of the Swift-XRT team.
GCN 20678 table
GRB_name GRB170214A
GCN_number 20678
Detection_method Konus-Wind Det
t_trigger 15:34:36.276 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 20678 SUBJECT: Konus-Wind observation of GRB 170214A DATE: 17/02/15 14:44:18 GMT FROM: Dmitry Frederiks at Ioffe Institute D. Frederiks, S. Golenetskii, R.Aptekar, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A.Lysenko, A. Kozlova, and T. Cline, on behalf of the Konus-Wind team, report: The long GRB 170214A (Fermi-GBM detection: Mailyan & Meegan, GCN 20675; Fermi-LAT detection: Racusin et al., GCN 20676) triggered Konus-Wind at T0=56076.276 s UT (15:34:36.276) The light curve shows count rate increase around ~T0-50 s followed by a bright, multi-peaked structure which starts at ~T0-14 s and has a total duration of ~150 s. The emission is seen up to ~10 MeV. As observed by Konus-Wind, the burst had a fluence of (2.41 ± 0.17)x10^-4 erg/cm2 and a 64-ms peak energy flux, measured from T0+52.480, of (8.77 ± 0.13)x10^-6 erg/cm2 (both in the 20 keV - 10 MeV energy range). The time-integrated spectrum (measured from T0 to T0+147.968 s) is best fit in the 20 keV - 15 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha = -0.70 (-0.06,+0.07), the high energy photon index beta = -2.61 (-0.27,+0.16), the peak energy Ep = 330 (-19,+21) keV, chi2 = 96/97 dof. The spectrum near the peak count rate (measured from T0+47.360 to T0+56.248 s) is best fit in the 20 keV - 15 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha = -0.75 (-0.12,+0.15), the high energy photon index beta = -2.56 (-1.15,+0.33), the peak energy Ep = 412 (-68,+73) keV, chi2 = 110/97 dof. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB170214_T56076/ All the quoted errors are estimated at the 90% confidence level. All the presented results are preliminary. [GCN OPS NOTE(15feb17): Per author's request, the value for the peak energy flux was changed from "10^-5" to "10^-6".]
GCN 20679 table
GRB_name GRB170214A
GCN_number 20679
Detection_method Swift-XRT Other
ra 256.3415°
decl -1.8875°
Circular_text TITLE: GCN CIRCULAR NUMBER: 20679 SUBJECT: GRB 170214A: Swift-XRT observations DATE: 17/02/15 14:47:44 GMT FROM: Andy Beardmore at U Leicester A.P. Beardmore (U. Leicester), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), A. Cholden-Brown (PSU), S. J. LaPorte (PSU), J.A. Kennea (PSU), S.L. Gibson (U. Leicester) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the Fermi/LAT-detected burst GRB 170214A (Racusin et al. GCN Circ. 20676), collecting 4.9 ks of Photon Counting (PC) mode data between T0+38.6 ks and T0+65.3 ks. Two uncatalogued X-ray sources have been detected, however none of them is above the RASS limit or shows definitive signs of fading. Therefore, at the present time we cannot identify which, if any, is the afterglow. Details of these sources are given below: Source 1: RA (J2000): 256.34147 = 17:05:21.95 Dec (J2000): -1.88746 = -01:53:14.9 Error: 2.4 arcsec (radius, 90% conf. [Enhanced position]) Count-rate: 0.0131 +/- 0.0021 ct s^-1 Distance: 49 arcsec from Fermi/LAT position. Flux: (4.88 +/- 0.78)e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV) Source 3: RA (J2000): 256.3873 = 17:05:32.95 Dec (J2000): -2.0113 = -02:00:40.8 Error: 8.8 arcsec (radius, 90% conf.) Count-rate: (1.94 [+0.96, -0.74])e-3 ct s^-1 Distance: 515 arcsec from Fermi/LAT position. A catalogued source was also detected. The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at http://www.swift.ac.uk/ToO_GRBs/00020740. This circular is an official product of the Swift-XRT team.
GCN 20681 table
GRB_name GRB170214A
GCN_number 20681
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 20681 SUBJECT: GRB170214A: RATIR Optical and NIR Observations DATE: 17/02/15 21:59:15 GMT FROM: Eleonora Troja at GSFC Eleonora Troja (GSFC), 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), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jesús González (UNAM), Carlos Román-Zúñiga (UNAM), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report: We observed the field of GRB 170214A (Mailyan, et al., GCN 20675; Racusin, et al., GCN 20676) 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 15.44 to 2017/02 15.50 UTC (10.58 to 11.99 hours after the GBM trigger). We performed a series of tiled observations partially covering the LAT error circle, obtaining a total of 0.40 hours exposure in the r and i bands and 0.32 hours exposure in the Z and Y bands. At the position of the first Swift/XRT source (source 1; Beardmore, et al., GCN 20679), in comparison with the SDSS DR9 and 2MASS catalogs, we obtain the following detections: r 21.06 +/- 0.11 i 20.89 +/- 0.13 Z 20.54 +/- 0.18 Y 20.34 +/- 0.32 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. We did not detect any significant fading during our observations, so at present we cannot confirm the nature of this source. Further observations are planned. The second, fainter XRT source (source 3; Beardmore, et al., GCN 20679) falls outside our set of frames. We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.
GCN 20682 table
GRB_name GRB170214A
GCN_number 20682
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 20682 SUBJECT: GRB 170214A: Swift/UVOT Upper Limits DATE: 17/02/16 07:17:01 GMT FROM: Alice Breeveld at MSSL-UCL A. A. Breeveld (UCL-MSSL) and A.P. Beardmore (U. Leicester) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 170214A 38603 s after the LAT trigger (Mailyan and Meegan, GCN Circ. 20675). No optical afterglow consistent with the XRT’s source 1 position (Beardmore et al., GCN Circ. 20679, Troja et al., GCN Circ. 20681) is detected in the initial UVOT exposures. The source 3 position is just off the edge of the field of view. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for source 1 in the initial exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag w1 38603 65287 4856 >21.0 The magnitude in the table is not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.36 in the direction of the burst (Schlegel et al. 1998).
GCN 20683 table
GRB_name GRB170214A
GCN_number 20683
Detection_method Optical
ra 256.3413°
decl -1.8877°
Circular_text TITLE: GCN CIRCULAR NUMBER: 20683 SUBJECT: GRB 170214A: NOT optical afterglow confirmation DATE: 17/02/16 07:38:43 GMT FROM: Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst Daniele Malesani (DARK/NBI), Jens-Kristian Krogager (IAP and DARK/NBI), and Adarsh Ranjan (IAP), report on behalf of a larger collaboration: We observed the candidate optical counterpart of GRB 170214A (Mailyan & Meegan , GCN 20675; Racusin et al., GCN 20676; Beardmore et al., GCN 20679; Troja et al., GCN 20681) with the Nordic Optical Telescope (NOT), equipped with the AlFOSC camera. Three observations by 300 s each were taken in the SDSS r band, under a seeing of 0.7", starting on 2017 Feb 16.263 UT (38.90 hr after the Fermi/GBM trigger). We note that our pointing only covers XRT source #1 from Beardmore et al. (GCN 20679). Within the XRT error circle (Beardmore et al., GCN 20679), we detect a single object at coordinates (0.5" error): RA(J2000) = 17:05:21.90 Dec(J2000) = -01:53:15.7 We assume that this is the same object reported by Troja et al. (GCN 20681). Calibrating against nearby SDSS stars, we measure r = 22.45 +- 0.07 AB. The fading by more than 1 mag compared to the RATIR measurement (Troja et al., GCN 20681), as well as the spatial association with an X-ray source (Beardmore et al., GCN 20679), confirm this object to be the optical afterglow of GRB 170214A.
GCN 20684 table
GRB_name GRB170214A
GCN_number 20684
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 20684 SUBJECT: GRB 170214A: GROND detection in all bands DATE: 17/02/16 14:07:29 GMT FROM: Patricia Schady at MPE/Swift Patricia Schady and Thomas Kruehler (MPE Garching) report: We observed the field of the Fermi GRB 170214A (trigger 508779271/170214649, Mailyan et al., GCN #20675) 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 08:53 UT on 2017-02-15, 17.3 hrs after the GRB trigger, and they were performed at an average seeing of 1.5" and at an average airmass of 1.6. We detect an uncatalogued source within the XRT error circle of Source 1 (Beardmore et al., GCN #20679), at the same position reported by Malesani et al., (GCN #20683). Based on combined images with 16 min of total integration time in griz and 19 min in JHK at a mid-time of 09:05 UT on 2017-02-15, this source has the following preliminary magnitudes (all in the AB system): g' = 22.6 +/- 0.3 mag r = 21.3 +/- 0.1 mag i = 20.8 +/- 0.1 mag z' = 20.3 +/- 0.1 mag J = 19.6 +/- 0.1 mag H = 19.3 +/- 0.1 mag K = 18.8 +/- 0.3 mag We re-observed the target on 2017-02-16 at a mid-time of 08:45 UT, and the r-band magnitude has decayed by a further 0.1 mag compared to the NOT measurement (Malesani et al., GCN #20683). The given magnitudes are derived based on calibrating the images against SDSS in the optical and 2MASS field stars in the NIR bands. They are not corrected for the Galactic foreground extinction corresponding to a reddening of E_(B-V)= 0.30 in the direction of the burst (Schlafly & Finkbeiner 2011). We acknowledge the excellent help provided by the observer on the 2.2 m telescope at La Silla, Simona Ciceri, in obtaining these data.
GCN 20685 table
GRB_name GRB170214A
GCN_number 20685
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 20685 SUBJECT: GRB170214A: RATIR Optical and NIR Afterglow Confirmation DATE: 17/02/16 15:00:45 GMT FROM: Eleonora Troja at GSFC Eleonora Troja (GSFC), 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), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jesús González (UNAM), Carlos Román-Zúniga (UNAM), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report: We observed the field of GRB 170214A (Mailyan, et al., GCN 20675; Racusin, et al., GCN 20676) 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 16.46 to 2017/02 16.54 UTC (43.4 to 45.4 hours after the GBM trigger), obtaining a total of 1.42 hours exposure in the r and i bands and 0.60 hours exposure in the Z and Y bands. Source 1 (Beardmore, et al., GCN 20679; Troja, et al., GCN 20681) is still detected in our observations at a position consistent with the NOT source (Malesani, et al., GCN 20683). In comparison with the SDSS DR9 and 2MASS catalogs, we obtain the following detections: r 22.78 +/- 0.08 i 22.40 +/- 0.15 Z 21.54 +/- 0.17 Y 21.22 +/- 0.17 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. Compared to our first night of observations (Troja, et al., GCN 20681) the source significantly faded in all filters, confirming that it is the optical (Malesani, et al., GCN 20683) and NIR afterglow of GRB170214A. We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.
GCN 20686 table
GRB_name GRB170214A
GCN_number 20686
Detection_method Optical
redshift 2.5300
Circular_text TITLE: GCN CIRCULAR NUMBER: 20686 SUBJECT: GRB 170214A: VLT/X-shooter spectroscopy and tentative redshift DATE: 17/02/16 16:41:59 GMT FROM: Thomas Kruehler at MPE Garching T. Kruehler, P. Schady, J. Greiner (all MPE Garching) and N. R. Tanvir (U. Leicester) report: We observed the optical counterpart (Troja et al. GCN 20681, Malesani et al. GCN 20683, Schady et al. GCN 20684) of GRB 170214A (Mailyan and Meegan, GCN 20675, Racusin et al. GCN 20676) with the ESO Very Large Telescope UT 2 (Kueyen) equipped with the X-shooter spectrograph, covering the wavelength range 3200-20000 AA. Observations started at 08:18 UT on 2017-02-16, roughly 40.7 hours after the burst and consisted of 6 exposures of 600 s each. Our spectrum has a low signal-to-noise ratio with no signal being detected bluewards of around 5800 AA due to a combination of high background from the bright moon and faint afterglow. In the red part, the spectrum exhibits four marginal absorption features, which are consistent with coming from various FeII transitions at a common redshift of z=2.53. We acknowledge excellent support from the ESO observing staff in Paranal, in particular Marcela Espinoza, Cedric Ledoux, and Stephane Brillant.
GCN 20687 table
GRB_name GRB170214A
GCN_number 20687
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 20687 SUBJECT: GRB 170214A: Mondy optical upper limit DATE: 17/02/16 17:10:55 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), A. Volnova (IKI), report on behalf of larger GRB follow-up collaboration: We observed the field of GRB 170214A (Mailyan et al., GCN 20675; Racusin et al., GCN 20676) with AZT-33IK telescope of Sayan observatory (Mondy) starting on Feb., 15 (UT) 20:58:01. We obtained several images in R-filter. The optical counterpart of GRB 170214A (Troja et al., GCN 20681; Malesani et al., GCN 20683; Schady et al., GCN 20684) is not detected in our stacked image. Preliminary photometry of the field is following Date UT start t-T0 Filter Exp. OT UL (mid, days) (s) 2017-02-15 20:58:01 1.24558 R 120*30 n/d 21.4 Photometry is based on nearby SDSS-DR9 stars SDSS-DR9_id R(Lupton) J170525.39-015302.5 17.50 J170522.63-015255.8 17.31 J170519.90-015220.7 18.47 J170517.04-015226.0 15.51 J170515.90-015250.9 17.81 J170518.92-015435.6 17.44 J170512.43-015325.4 16.54 J170511.57-015336.2 18.05
GCN 20691 table
GRB_name GRB170214A
GCN_number 20691
Detection_method Swift-XRT Other
ra 256.3415°
decl -1.8875°
Circular_text TITLE: GCN CIRCULAR NUMBER: 20691 SUBJECT: GRB 170214A: Swift-XRT afterglow detection DATE: 17/02/18 02:47:32 GMT FROM: Andy Beardmore at U Leicester A.P. Beardmore (U. Leicester), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), A. Cholden-Brown (PSU), S. J. LaPorte (PSU), J.A. Kennea (PSU), S.L. Gibson (U. Leicester) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: Swift-XRT has conducted further observations of the field of the Fermi/LAT-detected burst GRB 170214A. The observations now extend from T0+38.6 ks to T0+274.4 ks. Of the sources previously reported, "Source 1" is above the RASS limit and fading with 3-sigma significance, and is therefore likely the GRB afterglow. Using 4445 s of PC mode data and 4 UVOT images, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 256.34147, -1.88746 which is equivalent to: RA (J2000): 17h 05m 21.95s Dec(J2000): -01d 53' 14.9" with an uncertainty of 2.4 arcsec (radius, 90% confidence). This position is 49 arcsec from the Fermi/LAT position. The source is fading with alpha >0.7. The results of the XRT-team automatic analysis of the likely afterglow are at http://www.swift.ac.uk/ToO_GRBs/00020740/index_1.php. The results of the full analysis of the XRT observations are available at http://www.swift.ac.uk/ToO_GRBs/00020740. This circular is an official product of the Swift-XRT team.