GRB170604A

This page lists all entries on GRB170604A in GRBweb

Summary IPN Swift GCN 21191 GCN 21192 GCN 21195 GCN 21196 GCN 21197 GCN 21198 GCN 21200 GCN 21203 GCN 21204 GCN 21207 GCN 21247

Summary table
Variable Value Source
T0 19:08:50 UTC GCN_circulars,Swift Det
ra 342.6563° Swift
decl -15.4122° Swift
pos_error 1.29e-05° Swift
T90 26.7 s Swift
T90_start 19:08:50 UTC Swift
fluence 5.10e-06 erg/cm² Swift
redshift 1.3290
T100 26.7 s
GBM_located False
mjd 57908.797800925924 GCN_circulars,Swift Det
IPN table
GRB_name GRB170604A
ra 342.6458°
decl -15.4167°
pos_error 5.00e-02°
redshift 1.3290
Swift table
GRB_name GRB170604A
t_trigger 19:08:50 UTC
ra 342.6563°
decl -15.4122°
pos_error 1.29e-05°
T90 26.7 s
fluence 5.10e-06 erg/cm²
redshift 1.3290
GCN 21191 table
GRB_name GRB170604A
GCN_number 21191
Detection_method Swift Det
t_trigger 19:08:50 UTC
ra 342.6450°
decl -15.4140°
Circular_text TITLE: GCN CIRCULAR NUMBER: 21191 SUBJECT: GRB 170604A: Swift detection of a burst DATE: 17/06/04 19:29:03 GMT FROM: Kim Page at U.of Leicester K. L. Page (U Leicester), A. Cholden-Brown (PSU), N. P. M. Kuin (UCL-MSSL), A. Y. Lien (GSFC/UMBC) and F. E. Marshall (NASA/GSFC) report on behalf of the Swift Team: At 19:08:50 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 170604A (trigger=755867). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 342.645, -15.414 which is RA(J2000) = 22h 50m 35s Dec(J2000) = -15d 24' 50" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 25 sec. The peak count rate was ~2400 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 19:10:55.1 UT, 124.7 seconds after the BAT trigger. No source was detected in the 2.5-s promptly available image. However, the XRT TDRSS light curve suggests the presence of a bright, fading source; since no Photon Counting mode data were collected, no prompt source localisation can be performed. We are waiting for the full dataset to detect and localise the XRT counterpart. No results from UVOT are available at this time. Burst Advocate for this burst is K. L. Page (klp5 AT leicester.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 21192 table
GRB_name GRB170604A
GCN_number 21192
Detection_method Optical
ra 342.6564°
decl -15.4123°
Circular_text TITLE: GCN CIRCULAR NUMBER: 21192 SUBJECT: GRB 170604A: optical observations DATE: 17/06/04 20:17:53 GMT FROM: Luca Izzo at IAA-CSIC L. Izzo, A. de Ugarte Postigo, Z. Cano, D.A. Kann (IAA-CSIC) report on behalf of a larger collaboration, We observed the field of GRB 170604A (Page et al., GCN 21191) with the T27 (Plane Wave CDK 0.70m) of the iTelescope.Net (http://www.itelescope.net) located at Siding Spring, AU. A single image of 300 s each was taken in the R and in the V filters, starting at 19:32:07 UT, ~ 1400s after the GRB trigger. We detect a source not visible in PanSTARRS images at RA = 22:50:37.54 DEC = -15:24:44.4 (+- 0.5”) with a preliminary magnitude of R ~ 17.5 (as compared to USNO-B 1.0 field stars), which we consider to be the afterglow. An image of the field can be seen at http://goo.gl/Rjmsk6
GCN 21195 table
GRB_name GRB170604A
GCN_number 21195
Detection_method Swift-BAT Det
ra 342.6450°
decl -15.4060°
Circular_text TITLE: GCN CIRCULAR NUMBER: 21195 SUBJECT: GRB 170604A: Swift-BAT refined analysis DATE: 17/06/05 02:19:40 GMT FROM: Amy Lien at GSFC M. Stamatikos (OSU), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), T. Sakamoto (AGU), 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 170604A (trigger #755867) (Page et al., GCN Circ. 21191). The BAT ground-calculated position is RA, Dec = 342.645, -15.406 deg which is RA(J2000) = 22h 50m 34.9s Dec(J2000) = -15d 24' 20.1" with an uncertainty of 1.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 8%. The mask-weighted light curve shows several overlapping pulses that start at ~ T-12 s and end at ~T+20 s. The main peak occurs at ~T+3 s. T90 (15-350 keV) is 26.70 +- 6.21 sec (estimated error including systematics). The time-averaged spectrum from T-11.66 to T+22.58 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.31 +- 0.12. The fluence in the 15-150 keV band is 5.1 +- 0.4 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+2.66 sec in the 15-150 keV band is 4.2 +- 0.9 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/755867/BA/
GCN 21196 table
GRB_name GRB170604A
GCN_number 21196
Detection_method Swift-XRT Det
ra 342.6562°
decl -15.4123°
Circular_text TITLE: GCN CIRCULAR NUMBER: 21196 SUBJECT: GRB 170604A: Enhanced Swift-XRT position DATE: 17/06/05 08:03:35 GMT FROM: Kim Page at U.of Leicester K.L. Page, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team: Using 4539 s of XRT Photon Counting mode data and 10 UVOT images, 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 = 342.65623, -15.41233 which is equivalent to: RA (J2000): 22 50 37.49 Dec (J2000): -15 24 44.4 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 is an official product of the Swift-XRT team.
GCN 21197 table
GRB_name GRB170604A
GCN_number 21197
Detection_method Other
redshift 1.3290
Circular_text TITLE: GCN CIRCULAR NUMBER: 21197 SUBJECT: GRB 170604A: GTC spectroscopic redshift DATE: 17/06/05 08:04:01 GMT FROM: Zach Cano at U of Iceland L. Izzo, Z. Cano (IAA-CSIC), A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), D. A. Kann (IAA-CSIC), C. C. Thoene (IAA-CSIC), A. Marante (GTC) and S. Geier (GTC, IAC) report on behalf of a larger collaboration: We observed the afterglow of GRB 170604A (Page et al., GCN Circ. 21191) using OSIRIS at the 10.4 m GTC telescope at La Palma (Spain). The observation consisted of 2x900s and 1x1200s exposures using the R1000B grism, which covers a wavelength range of 3700-7880 AA. Observations began at 04:14:19 UT on the morning of 05 June, 2017, at a mean epoch of +9.51 hrs from the GRB detection. The afterglow candidate (Izzo et al, GCN Circ. 21192) is detected in the r-band acquisition image, where we measure r = 20.3 +- 0.1 relative to nearby PANSTARRS standards in the GRB field of view. The afterglow spectrum shows a continuum through the observed wavelength range, and we identify absorption features corresponding to MgII, MgI, and FeII at a common redshift of z=1.329, which we identify as the redshift of GRB 170604A.
GCN 21198 table
GRB_name GRB170604A
GCN_number 21198
Detection_method Swift-XRT Other
ra 342.6562°
decl -15.4123°
Circular_text TITLE: GCN CIRCULAR NUMBER: 21198 SUBJECT: GRB 170604A: Swift-XRT refined Analysis DATE: 17/06/05 08:21:54 GMT FROM: Phil Evans at U of Leicester B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), A. Cholden-Brown (PSU), B. Mingo (U. Leicester), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB) and K.L. Page report on behalf of the Swift-XRT team: We have analysed 7.6 ks of XRT data for GRB 170604A (Page et al. GCN Circ. 21191), from 110 s to 39.1 ks after the BAT trigger. The data comprise 308 s in Windowed Timing (WT) mode (the first 7 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. Using 4539 s of PC mode data and 10 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 = 342.65623, -15.41233 which is equivalent to: RA (J2000): 22h 50m 37.49s Dec(J2000): -15d 24' 44.4" with an uncertainty of 1.4 arcsec (radius, 90% confidence). The late-time light curve (from T0+3.8 ks) can be modelled with a power-law decay with a decay index of alpha=0.98 (+/-0.05). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.27 (+/-0.04). The best-fitting absorption column is 1.95 (+/-0.11) x 10^21 cm^-2, in excess of the Galactic value of 3.8 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.85 (+/-0.09) and a best-fitting absorption column of 6.9 (+2.3, -2.2) 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 (4.0 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 6.9 (+2.3, -2.2) x 10^20 cm^-2 Galactic foreground: 3.8 x 10^20 cm^-2 Excess significance: 2.3 sigma Photon index: 1.85 (+/-0.09) If the light curve continues to decay with a power-law decay index of 0.98, the count rate at T+24 hours will be 0.046 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.6 x 10^-12 (1.9 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/00755867. This circular is an official product of the Swift-XRT team.
GCN 21200 table
GRB_name GRB170604A
GCN_number 21200
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 21200 SUBJECT: GROND observations of GRB170604A DATE: 17/06/05 11:20:22 GMT FROM: Patricia Schady at MPE/Swift P. Schady (MPE) reports: We observed the field of GRB 170604A (Swift trigger 755867; Page et al., GCN #21191) 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 06:15 UT on 05-06-2017, 11.1 hours the GRB trigger. They were performed at an average seeing of 1.3" and at an average airmass of 2. We detect a point source within the 1.4" enhanced Swift/XRT error circle (Page et al., GCN 21196), and consistent with the afterglow position reported by Izzo et al. (GCN #21192). Based on a total exposure of 4.6 min in g'r'i'z' and 4 min in JHK, we estimate preliminary magnitudes (all in AB) of g' = 20.75 +/- 0.08 r' = 20.46 +/- 0.05 i' = 20.35 +/- 0.06 z' = 20.21 +/- 0.08 J = 19.6 +/- 0.1 H = 19.6 +/- 0.3 K > 19.6 Given magnitudes are calibrated against PanSTARRS and 2MASS field stars and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.03 mag in the direction of the burst (Schlafly & Finkbeiner 2011). We acknowledge the excellent support provided by Simona Ciceri in obtaining these data.
GCN 21203 table
GRB_name GRB170604A
GCN_number 21203
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 21203 SUBJECT: GRB 170604A: AbAO optical observations DATE: 17/06/05 15:48:31 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), R. Inasaridze (AbAO), A. Pozanenko (IKI), A. Volnova (IKI), V. Ayvazian (AbAO), O. Kvaratskhelia (AbAO), G. Inasaridze (AbAO), I. Molotov (KIAM), report on behalf of larger GRB follow-up collaboration: We observed the field of the Swift GRB 170604A (Page et al., GCN 21191) with AS-32 (0.7m) telescope of Abastumani Observatory starting on June, 04 (UT) 23:52:07. We obtained several unfiltered images of the field. Within enhanced XRT error circle (Page et al., GCN 21196) we detected the afterglow (Izzo et al, GCN 21192; Izzo et al, GCN 21197; Schady, , GCN 21200). Preliminary photometry of the afterglow is following Date UT start t-T0 Filter Exp. OT Err UpLim (3 sigma) (mid, days) (s) 2017-06-04 23:52:07 0.19950 CR 5*60 19.13 0.18 21.0 2017-06-05 00:00:50 0.20675 CR 7*60 19.23 0.16 21.1 2017-06-05 00:13:02 0.21885 CR 13*60 19.30 0.22 20.6 Photometry is based on nearby USNO-B1.0 stars (R2 magnitudes) USNO-B.1_id R2 0746-0830331 14.71 0746-0830367 14.76 0746-0830438 15.14 0746-0830455 14.77 0747-0821123 14.60 [GCN OPS NOTE(05jun17): Per author's request, the duplicate text of this circular was removed.]
GCN 21204 table
GRB_name GRB170604A
GCN_number 21204
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 21204 SUBJECT: GRB 170604A: RATIR Optical and NIR Observations DATE: 17/06/05 16:48:58 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), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report: We observed the field of GRB 170604A (Page, et al., GCN 21191) 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 2017/06 5.39 to 2017/06 5.45 UTC (14.19 to 15.70 hours after the BAT trigger), obtaining a total of 0.84 hours exposure in the r and i bands and 0.42 hours exposure in the Z and Y bands. For a source within the Swift-XRT error circle (Page, et al., GCN 21196), in comparison with the USNO-B1 and 2MASS catalogs, we obtain the following detections: r = 20.42 +/- 0.06 i = 20.65 +/- 0.07 Z = 20.45 +/- 0.13 Y = 20.40 +/- 0.30 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.
GCN 21207 table
GRB_name GRB170604A
GCN_number 21207
Detection_method Swift-UVOT Det
ra 342.6563°
decl -15.4122°
Circular_text TITLE: GCN CIRCULAR NUMBER: 21207 SUBJECT: GRB 170604A: Swift/UVOT Observations DATE: 17/06/05 19:10:10 GMT FROM: Mike Siegel at PSU/Swift MOC M. H. Siegel (PSU) and K. L. Page (U. Leicester) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 170604A 128 s after the BAT trigger (Page et al., GCN Circ. 21191). We detect a fading afterglow consistent with the position given by XRT (Page et al., GCN Circ 21196) and ground-based optical detections (Izzy et al., GCN Circ 21197; Schady, GCN Circ. 21200; Mazaeva et al., GCN Circ 21203). The preliminary UVOT position is: RA (J2000) = 22:50:37.52 = 342.65632 (deg.) Dec (J2000) = -15:24:43.9 = -15.41220 (deg.) with an estimated uncertainty of 0.1 arc sec. (radius, 90% confidence). Preliminary magnitudes and 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) 128 278 147 15.81+-0.03 white 3968 5603 393 18.72+-0.06 white 39053 39959 885 20.57+-0.18 v 4378 6013 393 18.94+-0.31 v 34480 44756 1268 >19.89 b 3763 5398 393 19.26+-0.15 b 38141 39048 885 >20.86 u (fc) 287 429 279 15.70+-0.03 u 4993 5193 196 18.51+-0.16 u 28543 29132 576 >19.72 uvw1 4788 4988 196 18.47+-0.19 uvw1 23318 46354 1633 20.20+-0.27 uvm2 4583 6169 344 18.58+-0.18 uvm2 44762 45661 885 >20.37 uvw2 4174 5809 393 19.53+-0.26 uvw2 32392 40613 1700 >20.86 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.04 in the direction of the burst (Schlegel et al. 1998).
GCN 21247 table
GRB_name GRB170604A
GCN_number 21247
Detection_method Konus-Wind Det
t_trigger 17:08:50.402 UTC
redshift 1.3290
Circular_text TITLE: GCN CIRCULAR NUMBER: 21247 SUBJECT: Konus-Wind observation of GRB 170604A DATE: 17/06/11 15:27:18 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 170604A (Swift-BAT trigger #736407: Page et al., GCN 21191; Stamatikos et al., GCN 21195; T0(BAT)=17:08:50.402 UT) was detected by Konus-Wind (KW) in the waiting mode. The light curve shows a single peak with a duration of ~30 s. Modeling the KW 3-channel time-integrated spectrum (from T0(BAT)-16.155 s to T0(BAT)+10.341 s) by a power law with exponential cutoff (CPL) model dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) yields alpha = -1.31(-0.20,+0.26) and Ep = 220(-48,+72) keV. The energy fluence for this time interval is (1.03 ± 0.13)x10^-5 erg/cm2, and the peak energy flux, measured on a 2.944 s scale from T0(BAT)+1.509 s is (6.9 ± 0.13)x10^-7 erg/cm2/s, both in the 20 keV-10 MeV range. Assuming the redshift z=1.329 (Izzo et al., GCN 21197) and a standard cosmology model with H_0 = 70 km/s/Mpc, Omega_M = 0.30, and Omega_Lambda = 0.70, we estimate the burst isotropic energy release E_iso to (4.7 ± 0.6)x10^52 erg, and the rest-frame peak energy of the time-integrated spectrum, Ep,z, to 512(-112,+168) keV. The K-W light curve of this burst is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB170604A/ All the quoted errors are estimated at the 1 sigma confidence level. All the presented results are preliminary.