GRB191004B

This page lists all entries on GRB191004B in GRBweb

Summary IPN Swift GCN 25947 GCN 25949 GCN 25951 GCN 25954 GCN 25955 GCN 25956 GCN 25958 GCN 25960 GCN 25961 GCN 25974 GCN 25976 GCN 25977 GCN 25978

Summary table
Variable Value Source
T0 21:33:41 UTC GCN_circulars,Swift Det
ra 49.2046° Swift
decl -39.6344° Swift
pos_error 5.57e-05° Swift
T90 37.7 s Swift
T90_start 21:33:41 UTC Swift
fluence 2.50e-06 erg/cm² Swift
redshift 3.5030
T100 37.7 s
GBM_located False
mjd 58760.8983912037 GCN_circulars,Swift Det
IPN table
GRB_name GRB191004B
ra 49.1750°
decl -39.6167°
pos_error 5.00e-02°
redshift 3.5030
Swift table
GRB_name GRB191004B
t_trigger 21:33:41 UTC
ra 49.2046°
decl -39.6344°
pos_error 5.57e-05°
T90 37.7 s
fluence 2.50e-06 erg/cm²
redshift 3.5030
GCN 25947 table
GRB_name GRB191004B
GCN_number 25947
Detection_method Swift Det
t_trigger 21:33:41 UTC
ra 49.1770°
decl -39.6130°
Circular_text TITLE: GCN CIRCULAR NUMBER: 25947 SUBJECT: GRB 191004B: Swift detection of a burst with an optical counterpart DATE: 19/10/04 21:43:36 GMT FROM: David Palmer at LANL S. B. Cenko (GSFC), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), A. D'Ai (INAF-IASFPA), V. D'Elia (SSDC), J.D. Gropp (PSU), J. A. Kennea (PSU), N. J. Klingler (PSU), N. P. M. Kuin (UCL-MSSL), S Laha (CRESST/GSFC/UMD), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), M. J. Moss (GWU), D. M. Palmer (LANL) and A. Tohuvavohu (Toronto) report on behalf of the Neil Gehrels Swift Observatory Team: At 21:33:41 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 191004B (trigger=927839). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 49.177, -39.613, which is RA(J2000) = 03h 16m 42s Dec(J2000) = -39d 36' 46" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows multiple peaks with a total duration of about 40 sec. The peak count rate was ~9500 counts/sec (15-350 keV), at ~3 sec after the trigger. The XRT began observing the field at 21:34:39.3 UT, 57.7 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 49.20403, -39.63494 which is equivalent to: RA(J2000) = 03h 16m 48.97s Dec(J2000) = -39d 38' 05.8" with an uncertainty of 3.9 arcseconds (radius, 90% containment). This location is 108 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. No spectrum from the promptly downlinked event data is yet available to determine the column density. The initial flux in the 2.5 s image was 1.81e-09 erg cm^-2 s^-1 (0.2-10 keV). UVOT took a finding chart exposure of 150 seconds with the White filter starting 68 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at RA(J2000) = 03:16:49.10 = 49.20458 DEC(J2000) = -39:38:03.3 = -39.63425 with a 90%-confidence error radius of about 0.62 arc sec. This position is 2.9 arc sec. from the center of the XRT error circle. The estimated magnitude is 18.00 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.02. Burst Advocate for this burst is S. B. Cenko (brad.cenko 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/)
GCN 25949 table
GRB_name GRB191004B
GCN_number 25949
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 25949 SUBJECT: GRB 191004B: Optical Afterglow Detection with LCO DATE: 19/10/04 23:55:39 GMT FROM: Robert Strausbaugh at U. of the Virgin Islands R. Strausbaugh (U. of the Virgin Islands), A. Cucchiara (U. of the Virgin Islands/College of Marin) report on behalf of a larger collaboration: We observed Swift GRB 191004B (Palmer et al., GCN 25947) with the LCO 1-m Sinistro instrument on September 4, from 21:50 to 22:07 UT (corresponding to 0.11 to 0.4 hours from the GRB trigger time) with the Bessel R filter. We performed a series of 5x180s exposures, and we detect a source not present in either USNO-B1.0 or 2MASS surveys consistent with the optical afterglow location (Palmer et al., GCN 25947 ) with the following magnitude: R = 18.07 +/- 0.02 This flux is calibrated against several USNO-B1.0 objects near the GRB location but is not corrected for Galactic Extinction. These observations were possible thanks to the USVI NASA-EPSCoR Research Infrastructure Development (RID) grant NNX16AL44A.
GCN 25951 table
GRB_name GRB191004B
GCN_number 25951
Detection_method Swift-XRT Det
ra 49.2040°
decl -39.6350°
Circular_text TITLE: GCN CIRCULAR NUMBER: 25951 SUBJECT: GRB 191004B: Enhanced Swift-XRT position DATE: 19/10/05 01:36:47 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 162 s of XRT Photon Counting mode data and 1 UVOT images for GRB 191004B, 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 = 49.20398, -39.63502 which is equivalent to: RA (J2000): 03h 16m 48.96s Dec (J2000): -39d 38' 06.1" with an uncertainty of 2.0 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 25954 table
GRB_name GRB191004B
GCN_number 25954
Detection_method Optical
ra 49.2266°
decl -39.6282°
Circular_text TITLE: GCN CIRCULAR NUMBER: 25954 SUBJECT: GRB 191004B: NOT optical photometry DATE: 19/10/05 03:58:45 GMT FROM: Kasper Elm Heintz at Univ. of Iceland and DAWN/NBI K. E. Heintz (Univ. of Iceland), D. B. Malesani (DTU space), and S. Moran (NOT), report on behalf of a larger collaboration: We observed the field of the Swift-detected GRB 191004B (Cenko et al., GCN 25947) with the Nordic Optical Telescope (NOT) equipped with StanCAM. We obtained 3x300s exposures with the Bessel R filter starting at 02:30:07 UT on October 5 (i.e. 4.94 hr post-burst). We clearly detect the optical afterglow (Cenko et al., GCN 25947; Lipunov et al., GCN 25948; Strausbaugh & Cucchiara, GCN 25949) and measure a magnitude of R = 20.87 +/- 0.05 mag in the stacked image. We calibrated the photometry assuming for the USNO star at (RA, Dec) = (03:16:54.39, -39:37:41.5) a magnitude of R = 16.97 mag. The derived magnitude for the GRB afterglow is not corrected for the Galactic extinction.
GCN 25955 table
GRB_name GRB191004B
GCN_number 25955
Detection_method Swift-BAT Det
ra 49.2000°
decl -39.6370°
Circular_text TITLE: GCN CIRCULAR NUMBER: 25955 SUBJECT: GRB 191004B: Swift-BAT refined analysis DATE: 19/10/05 04:07:48 GMT FROM: Scott Barthelmy at NASA/GSFC M. Stamatikos (OSU), S. D. Barthelmy (GSFC), S. B. Cenko (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-60 to T+243 sec from recent telemetry downlinks, we report further analysis of BAT GRB 191004B (trigger #927839) (Cenko, et al., GCN Circ. 25947). The BAT ground-calculated position is RA, Dec = 49.200, -39.637 deg, which is RA(J2000) = 03h 16m 47.9s Dec(J2000) = -39d 38' 15.0" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 97%. The mask-weighted light curve shows multiple overlapping peaks starting at T-1 sec, peaking at ~T+7 sec, and ending at ~T+45 sec. T90 (15-350 keV) is 37.7 +- 14.9 sec (estimated error including systematics). The time-averaged spectrum from T-1.45 to T+56.17 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.10 +- 0.08. The fluence in the 15-150 keV band is 2.5 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+2.75 sec in the 15-150 keV band is 5.0 +- 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/927839/BA/
GCN 25956 table
GRB_name GRB191004B
GCN_number 25956
Detection_method Swift-BAT Det
redshift 3.5030
Circular_text TITLE: GCN CIRCULAR NUMBER: 25956 SUBJECT: GRB 191004B: VLT/X-shooter redshift DATE: 19/10/05 08:40:16 GMT FROM: Valerio D'Elia at ASDC V. D'Elia (SSDC), J. P. U. Fynbo (DAWN/NBI), L. Izzo (DARK/NBI), D. B. Malesani (DTU Space), K. E. Heintz (Univ. of Iceland), N. R. Tanvir (Univ. Leicester), A. de Ugarte Postigo (HETH/IAA-CSIC, DARK/NBI), S. D. Vergani (CNRS -GEPI/Observatorie de Paris) report on behalf of the Stargate collabaration: We observed the optical afterglow (Lipunov et al., GCN 25948, Strausbaugh et al., GCN 25949) of the Swift/BAT GRB 191004B (Cenko et al., GCN 25947) using the ESO VLT UT2 (Kueyen) equipped with the X-shooter spectrograph. Our spectra cover the wavelength range 3000-21000 AA, and consist of 6 exposures by 600 s each. The observation mid time was 2019 Oct 05 at about 5:30 UT (8 hr after the GRB). In a 30 s image taken with the acquisition camera on Oct 05.1989 UT, we detect the optical afterglow, for which we measure a magnitude r = 21.23 +- 0.03 AB (calibrated against nearby stars from the SkyMapper catalog; Wolf et al. 2018, PASA, 35, 010; https:doi.org/10.4225/41/593620ad5b574). We clearly detect continuum over the full covered wavelength range. A strong absorption is visible around 5474 AA, and an emission feature at 5479 AA, which we identify as due to H I. This is confirmed by the presence of the Ly alpha forest blueward of this wavelength. We also detect other narrower absorption features which we interpret as due to e.g. C IV and Si IV at a common redshift z = 3.503. The continuum is well detected down to ~800 AA rest frame, i.e, below the Lyman limit. We also detect an intervening absorber (Mg II, Fe II) at z=2.137 We acknowledge excellent support from the ESO observing staff in Paranal, in particular Camila Navarrete and Bin Yang.
GCN 25958 table
GRB_name GRB191004B
GCN_number 25958
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 25958 SUBJECT: GRB 191004B: COATLI Optical Observations DATE: 19/10/06 03:15:25 GMT FROM: Alan M Watson at UNAM Alan M. Watson (UNAM), Nat Butler (ASU), Rosa L. Becerra (UNAM), Diego González (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Margarita Pereyra (UNAM), and Eleonora Troja (GSFC) report: We observed the field of GRB 191004B (Cenko et al., GCN Circ. 25947) with the COATLI 50-cm telescope and interim imager at the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir (http://coatli.astroscu.unam.mx) from 2019-10-05 06:54 to 12:11, obtaining a total of 1.65 hours of exposure in the w filter. At the position of the bright afterglow detected by Swift/UVOT (Cenko et al., GCN Circ. 25947), we detect a source with w = 21.47 +/- 0.17. Our w magnitudes are calibrated against the Pan-STARRS1 catalog, are on an approximate AB system (Becerra et al., 2019, ApJ, 872, 118), and are not corrected for Galactic extinction in the direction of the GRB. We thank the COATLI technical team and the staff of the Observatorio Astronómico Nacional.
GCN 25960 table
GRB_name GRB191004B
GCN_number 25960
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 25960 SUBJECT: GRB 191004B: GROND Detection of the Optical/NIR Afterglow DATE: 19/10/06 10:24:52 GMT FROM: Patricia Schady at Swift P. Schady (Univ. of Bath), J. Balmer (MPE Garching), and A. Nicuesa Guelbenzu (TLS Tautenburg) report: We observed the field of GRB 191004B (Swift trigger 927839; Cenko et al., GCN #25947) 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 02:25 UT on 5th October, 4.9 hours after the GRB trigger. They were performed at an average seeing of 1.5" and at an average airmass of 1.8. We detect a single point source consistent with the position of the Swift-XRT and MASTER afterglow (Beardmore et al., GCN # 25951; Lipunov et al., GCN # 25948) in all optical and NIR bands apart from K. In an 8 min exposure, we measure an AB magnitude in the r band filter of r' = 20.86 +/- 0.04 mag. The optical and NIR afterglow is still clearly detected in a second epoch of observations taken on the night of 6th October, with an AB magnitude r' = 22.10 +/- 0.03 mag. The above magnitudes are calibrated again sky-mapper, and not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.01 in the direction of the burst (Schlafly & Finkbeiner 2011). We acknowledge the excellent support from Regis Lachaume in La Silla in acquiring these observations.
GCN 25961 table
GRB_name GRB191004B
GCN_number 25961
Detection_method Swift-XRT Other
redshift 3.5030
Circular_text TITLE: GCN CIRCULAR NUMBER: 25961 SUBJECT: GRB 191004B: Swift-XRT refined Analysis DATE: 19/10/06 12:41:44 GMT FROM: Phil Evans at U of Leicester A. Tohuvavohu (U. Toronto), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), E. Ambrosi (INAF-IASFPA) , M. Capalbi (INAF-IASFPA), M. Perri (ASDC), J.A. Kennea (PSU), B. Sbarufatti (PSU), and S.B. Cenko report on behalf of the Swift-XRT team: We have analysed 8.6 ks of XRT data for GRB 191004B (Cenko et al. GCN Circ. 25947), from 63 s to 102.9 ks after the BAT trigger. The data comprise 142 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 25951). The light curve can be modelled with an initial power-law decay with an index of alpha=2.9 (+0.6, -0.7), followed by a break at T+94.6 s to an alpha of 1.073 (+0.031, -0.027). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.75 (+0.09, -0.07). The best-fitting absorption column is 1.4 (+6.8, -1.4) x 10^21 cm^-2, at a redshift of 3.503, in addition to the Galactic value of 1.9 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.54 (+0.21, -0.14) and a best-fitting absorption column of 2 (+178, -2) x 10^20 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.2 x 10^-11 (4.3 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Galactic foreground: 1.9 x 10^20 cm^-2 Intrinsic column: 2 (+178, -2) x 10^20 cm^-2 at z=3.503 Photon index: 1.54 (+0.21, -0.14) The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00927839. This circular is an official product of the Swift-XRT team.
GCN 25974 table
GRB_name GRB191004B
GCN_number 25974
Detection_method Konus-Wind Det
t_trigger 21:33:46.990 UTC
redshift 1.2600
Circular_text TITLE: GCN CIRCULAR NUMBER: 25974 SUBJECT: Konus-Wind observation of GRB 191004B DATE: 19/10/07 18:00:56 GMT FROM: Dmitry Svinkin at Ioffe Institute D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, M. Ulanov, A. Tsvetkova, A. Lysenko, A. Kozlova, and T. Cline on behalf of the Konus-Wind team, report: The long-duration GRB 191004B (Swift-BAT detection: Cenko et al., GCN circ. 25947; Stamatikos et al., GCN circ. 25955) triggered Konus-Wind at T0=77626.99 s UT (21:33:46.990). The burst light curve shows a multi-peaked structure which starts at ~T0-0.5 s and has a total duration of ~5.5 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/GRB191004_T77626/ As observed by Konus-Wind, the burst had a fluence of 4.13(-0.40,+0.45)x10^-6 erg/cm2, and a 64-ms peak flux, measured from T0+3.504 s, of 2.56(-0.73,+0.74)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+8.448 s) is best fit in the 20 keV - 10 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.51(-0.30,+0.34) and Ep = 172(-21,+27) keV (chi2 = 59/57 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -3.0 (chi2 = 59/56 dof). Assuming the redshift z=1.260 (D'Elia et al., GCN circ. 25956) and a standard cosmology model with H_0 = 67.3 km/s/Mpc, Omega_M = 0.315, and Omega_Lambda = 0.685 (Planck Collaboration, 2014), we estimate the following rest-frame parameters: the isotropic energy release E_iso is 1.79(-0.17,+0.20)x10^52 erg, the peak luminosity L_iso is 2.51(-0.72,+0.73)x10^52 erg/s, and the rest-frame peak energy of the time-integrated spectrum, Ep,i, is 389(-47,+61) keV. With these energetics, the burst lies within the 90% prediction bands for both 'Amati' and 'Yonetoku' relations built for the sample of 138 long KW GRBs with known redshifts (Tsvetkova et al., ApJ 850 161, 2017). All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
GCN 25976 table
GRB_name GRB191004B
GCN_number 25976
Detection_method Konus-Wind Det
redshift 3.5030
Circular_text TITLE: GCN CIRCULAR NUMBER: 25976 SUBJECT: GRB 191004B: Correction to Konus-Wind GCN 25974 DATE: 19/10/07 19:14:38 GMT FROM: Dmitry Svinkin at Ioffe Institute D. Svinkin reports on behalf of the Konus-Wind team: The redshift of GRB 191004B mentioned in GCN 25974 was incorrect, the correct one is z = 3.503 (D'Elia et al., GCN circ. 25956). Thus, assuming the redshift z=3.503 and a standard cosmology model with H_0 = 67.3 km/s/Mpc, Omega_M = 0.315, and Omega_Lambda = 0.685 (Planck Collaboration, 2014), we estimate the following rest-frame parameters: the isotropic energy release E_iso is 1.08(-0.10,+0.12)x10^53 erg, the peak luminosity L_iso is 3.01(-0.86,+0.87)x10^53 erg/s, and the rest-frame peak energy of the time-integrated spectrum, Ep,i, is 775(-95,+122) keV. With these energetics, the burst lies within the 68% prediction bands for both 'Amati' and 'Yonetoku' relations built for the sample of 138 long KW GRBs with known redshifts (Tsvetkova et al., ApJ 850 161, 2017). I apologize for possible inconvenience.
GCN 25977 table
GRB_name GRB191004B
GCN_number 25977
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 25977 SUBJECT: GRB 191004B: Continued Optical Afterglow Monitoring with LCO DATE: 19/10/07 20:11:14 GMT FROM: Robert Strausbaugh at U. of the Virgin Islands R. Strausbaugh (U. of the Virgin Islands), A. Cucchiara (U. of the Virgin Islands/College of Marin) report on behalf of a larger collaboration: We obtained a second epoch (first epoch, GCN 25949) of Swift GRB 191004B (Palmer et al., GCN 25947) data with the LCO 1-m Sinistro instrument at the Sutherland Site (SAAO) on September 5, from 2:40 to 3:03 UT (corresponding to 4.95 to 5.3 hours from the GRB trigger time) with the Bessel R and I filters. We performed a series of 5x240s exposures, and we detect the afterglow with the following magnitudes: R = 21.01 +/- 0.08 I = 19.91 +/- 0.08 This flux is calibrated against several USNO-B1.0 objects near the GRB location but is not corrected for Galactic Extinction. These observations were possible thanks to the USVI NASA-EPSCoR Research Infrastructure Development (RID) grant NNX16AL44A.
GCN 25978 table
GRB_name GRB191004B
GCN_number 25978
Detection_method Swift-UVOT Det
ra 49.2046°
decl -39.6344°
Circular_text TITLE: GCN CIRCULAR NUMBER: 25978 SUBJECT: GRB 191004B: Swift/UVOT Detection DATE: 19/10/07 20:45:09 GMT FROM: Sam LaPorte at PSU GRB 191004B: Swift/UVOT Detection S. J. LaPorte (PSU) and S. B. Cenko (GSFC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 191004B 69 s after the BAT trigger (Cenko et al., GCN Circ. 25947). A fading source consistent with the XRT position (Beardmore et al. GCN Circ. 25951) is detected in the initial UVOT exposures. The preliminary UVOT position is: RA (J2000) = 03:16:49.10 = 49.20459 (deg.) Dec (J2000) = -39:38:03.9 = -39.63441 (deg.) with an estimated uncertainty of 0.43 arc sec. (radius, 90% confidence), consistent with the positions reported by LCO (Strausbaugh et al. GCN Circ. 25949), NOT (Heintz et al. GCN Circ. 25954), VLT/X-Shooter (D'Elia et al. GCN Circ. 25956), COATLI (Watson et al. GCN Circ. 25958), and GROND (Schady et al. GCN Circ. 25960). 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 b 38697 38997 295 >20.42 uvm2 44827 45727 885 >20.25 u 294 387 91 >19.04 v 43916 44822 885 >20.07 uvw1 45734 46281 538 >19.96 uvw2 39915 40544 618 >20.09 white 82 232 147 18.01+-0.05 white 39003 39909 885 20.51+-0.13 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).