GRB141028A

This page lists all entries on GRB141028A in GRBweb

Summary Fermi GBM IPN Fermi LAT GCN 16969 GCN 16971 GCN 16972 GCN 16973 GCN 16975 GCN 16977 GCN 16978 GCN 16979 GCN 16980 GCN 16982 GCN 16983 GCN 16985 GCN 16986 GCN 16989 GCN 16990 GCN 16991 GCN 16993 GCN 17030 GCN 17035

Summary table
Variable Value Source
GRB_name_Fermi GRB141028455
T0 10:54:46.780 UTC GCN_circulars,Fermi GBM Det
ra 322.6023° Fermi_LAT
decl -0.2313° Fermi_LAT
pos_error 1.39e-04° Fermi_LAT
T90 31.489 s Fermi_GBM
T90_error 2.429 s Fermi_GBM
T90_start 10:54:53.439 UTC Fermi_GBM
fluence 3.48e-05 erg/cm² Fermi_GBM
fluence_error 8.91e-08 erg/cm² Fermi_GBM
redshift 2.3300 GCN_circulars,Optical
T100 38.148 s
GBM_located False
mjd 56958.45470810185 GCN_circulars,Fermi GBM Det
Fermi GBM table
GRB_name_Fermi GRB141028455
trigger_name bn141028455
ra 322.6008°
decl -0.2311°
pos_error 2.51e+00°
datum 2014-10-28
t_trigger 10:54:46.783 UTC
T90 31.489 s
T90_error 2.429 s
T90_start 10:54:53.439 UTC
fluence 3.48e-05 erg/cm²
fluence_error 8.91e-08 erg/cm²
flux_1024 1.73e+01 erg/cm²/s
flux_1024_error 3.42e-01 erg/cm²/s
flux_1024_time 1.26e+01 erg/cm²/s
flux_64 2.12e+01 erg/cm²/s
flux_64_error 1.36e+00 erg/cm²/s
IPN table
GRB_name GRB141028A
ra 322.7000°
decl -0.2833°
pos_error 4.00e-01°
redshift 2.3300
Fermi LAT table
GRB_name_Fermi GRB141028455
GRB_name GRB141028A
MET 436186506.08
datum 2014-10-28
t_trigger 10:55:03.080 UTC
ra 322.6023°
decl -0.2313°
pos_error 1.39e-04°
GCN 16969 table
GRB_name GRB141028A
GCN_number 16969
Detection_method Fermi LAT Det
t_trigger 10:54:46.780 UTC
ra 322.7000°
decl -0.2800°
Circular_text TITLE: GCN CIRCULAR NUMBER: 16969 SUBJECT: GRB 141028A: Fermi-LAT detection DATE: 14/10/28 17:34:43 GMT FROM: Elisabetta Bissaldi at U.Innsbruk/IAPP E. Bissaldi (University & INFN Trieste), J. L. Racusin (NASA/GSFC), F. Longo (University & INFN Trieste), D. Kocevski (NASA/GSFC), G. Vianello (Stanford Univ.) and M. Arimoto (Tokyo Tech) report on behalf of the Fermi-LAT team: At 10:54:46.78 on October 28, 2014, Fermi-LAT detected high-energy emission from GRB 141028A, which was also detected by Fermi-GBM (trigger 436186489/141028455) and initiated an autonomous repoint of the spacecraft. The best LAT on-ground location is found to be RA, Dec 322.70, -0.28 (J2000) with an error radius of 0.4 deg (90% containment, statistical error only). This was 25 deg from the LAT boresight at the time of the trigger. An improved position may be released when additional data is downlinked from the spacecraft. The data from the Fermi-LAT show a significant increase in the event rate at a position consistent with the GBM localization. More than 20 photons above 100 MeV are observed from trigger time T0 up to T0+600 s, when the position of the burst moved out of the LAT FoV. The highest-energy photon is a 3.9 GeV event which is observed 160 seconds after the GBM trigger. A Swift ToO has been approved for this burst. The Fermi-LAT point of contact for this burst is Makoto Arimoto (arimoto@hp.phys.titech.ac.jp). 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 16971 table
GRB_name GRB141028A
GCN_number 16971
Detection_method Fermi GBM Det
t_trigger 10:54:46.780 UTC
ra 316.3200°
decl 1.6700°
Circular_text TITLE: GCN CIRCULAR NUMBER: 16971 SUBJECT: GRB 141028A: Fermi GBM detection DATE: 14/10/28 19:00:19 GMT FROM: Oliver Roberts at UCD/Fermi O.J. Roberts (UCD) reports on behalf of the Fermi GBM Team: "At 10:54:46.78 UT on 28 October 2014, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 141028A (trigger 436186489 / 141028455), which was also detected by the LAT (Bissaldi et al. 2014, GCN 16969). The GBM on-ground location, using the Fermi GBM trigger data, is consistent with the LAT location. The trigger resulted in an Autonomous Repoint Request (ARR) that was accepted and the spacecraft slewed to the GBM in-flight location. The on-ground calculated location, using the GBM trigger data, is RA = 316.32, DEC = +1.67, with an uncertainty of 1.0 degrees (radius, 1-sigma containment, statistical only; there is additionally a systematic error which is currently estimated to be 2 to 3 degrees). The angle from the Fermi LAT boresight is about 19 degrees. The GBM light curve consists of a single episode with a duration (T90) of about 31.5 s (50-300 keV). The time-averaged spectrum from T0+0s to T0+31.7s is well fit by a Band function with Epeak = 249.9 (+/-12.6) keV, alpha = -0.71 +/- 0.03 , and beta = -1.93 (+/-0.03). The event fluence (10-1000 keV) in this time interval is (3.478 +/- 0.009)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+12.6 s in the 10-1000 keV band is 17.3 +/- 0.3 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN 16972 table
GRB_name GRB141028A
GCN_number 16972
Detection_method Other
ra 322.6021°
decl -0.2312°
Circular_text TITLE: GCN CIRCULAR NUMBER: 16972 SUBJECT: GRB 141028A: MASTER OT candidate detection DATE: 14/10/28 19:35:30 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs E. Gorbovskoy, V. Lipunov, N.Tyurina, M.Pruzhinskaya, V.Kornilov, D.Kuvshinov, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D.Denisenko Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov, A. Gabovich Blagoveschensk Educational State University, Blagoveschensk K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University V.Krushinski, I.Zalozhnih, A. Popov Ural Federal University, Kourovka Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA) MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Kislovodsk was pointed to the GRB141028A (GCN 16969, Bissaldi) in survey mode. MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 21h 30m 24.51s -00d 13m 52.3s on 2014-10-28.76451 UT. The OT unfiltered magnitude is 18.9m (limit 19.9m). The OT is seen in 12 images. There is no minor planet at this place. We have reference image without OT on 2014-07-22.97505 UT with unfiltered magnitude limit 19.7m. Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/213024.51-001352.3.png This message may be cited.
GCN 16973 table
GRB_name GRB141028A
GCN_number 16973
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 16973 SUBJECT: GRB 141028A Tiled Swift observations DATE: 14/10/28 19:48:52 GMT FROM: Phil Evans at U of Leicester P. A. Evans (U. Leicester) reports on behalf of the Swift team: Swift has initiated a series of observations, tiled on the sky, of the Fermi/LAT GRB 141028A. Automated analysis of the XRT data will be presented online at http://www.swift.ac.uk/xrt_products/TILED_GRB00030 Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. The probability of finding serendipitous sources, unrelated to the Fermi/LAT event is high: 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; and 2009, MNRAS, 397, 1177). This circular is an official product of the Swift-XRT team.
GCN 16975 table
GRB_name GRB141028A
GCN_number 16975
Detection_method IPN Triangulation
ra 16.5200°
decl 5.1230°
Circular_text TITLE: GCN CIRCULAR NUMBER: 16975 SUBJECT: IPN triangulation of GRB 141028A DATE: 14/10/28 21:30:37 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley, on behalf of the IPN, J. Goldsten, on behalf of the MESSENGER NS GRB team, and V. Connaughton, M. S. Briggs, C. Meegan, and V. Pelassa, on behalf of the Fermi GBM team, report: GRB 141028A (Bissaldi et al. GCN 16969, Roberts et al. GCN 16971) has also been observed by MESSENGER, so far. We have triangulated it to a preliminary, 3 sigma annulus, centered at RA, Dec = 16.520, +5.123 degrees, with radius R=54.469 +/- 0.200 degrees. This annulus intersects the LAT error circle at two points: RA Dec 322.487 deg -0.619 deg 322.416 deg +0.002 deg forming an error box whose area is approximately 0.03 degrees. This triangulation may be improved. A map has been posted at ssl.berkeley.edu/ipn3/141028A
GCN 16977 table
GRB_name GRB141028A
GCN_number 16977
Detection_method GROND
ra 322.6023°
decl -0.2313°
Circular_text TITLE: GCN CIRCULAR NUMBER: 16977 SUBJECT: GRB 141028A: GROND Afterglow confirmation (MASTER source) DATE: 14/10/29 02:03:03 GMT FROM: Alexander Kann at TLS Tautenburg J. F. Graham (MPE Garching), D. A. Kann (TLS Tautenburg), P. Schady, and J. Greiner (both MPE Garching) report on behalf of the GROND team: We observed the field of GRB 141028A (Fermi trigger 436186489; LAT detection: Bissaldi et al., GCN #16969; GBM Detection: Roberts; GCN #16971) 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 23:57 UT on October 28th, approximately 13 hours after the GRB trigger. They were performed at an airmass of 1.2 and seeing of 1".4. At the position of the MASTER candidate afterglow (Gorbovskoy, GCN #16972) we detect a bright source at RA (J2000) = 322.60226 = 21:30:24.54 DEC (J2000) = -0.231314 = -00:13:52.7 with an error of 0".5. Based on images with an exposure time of 1500 s in the optical and 1200 s in the NIR, centered at 0.55305 days after the trigger, we estimate preliminary magnitudes and limits (all in AB system) for this source of: g' = 20.76 +/- 0.02 mag r' = 19.93 +/- 0.01 mag i' = 19.70 +/- 0.02 mag z' = 19.49 +/- 0.02 mag J = 19.24 +/- 0.11 mag H = 18.94 +/- 0.08 mag K > 18.3 mag Compared to the MASTER detection, the source has faded significantly. We also detect a fading by 0.1 +/- 0.03 mag over the time span of an hour. Furthermore, the SED is adequately described by a power-law of slope beta = 1.1, with a possible g'-band dropout, which may point to a redshift of around 3 (which would make this a luminous afterglow). At the position of the XRT source reported in the GRB_COUNTERPART POSITION NOTICE (Source 3 at http://www.swift.ac.uk/xrt_products/TILED_GRB00030/), we detect no source down to limiting magnitudes of: g' > 24.5 mag r' > 24.4 mag i' > 23.7 mag z' > 23.4 mag J > 20.9 mag H > 20.6 mag K > 18.3 mag We therefore deem it likely the MASTER source represents the afterglow of GRB 141028A. Given magnitudes are calibrated against SDSS field stars (g'r'i'z') and 2MASS field stars (JHK) and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B- V) = 0.05 mag in the direction of the burst (Schlegel et al. 1998).
GCN 16978 table
GRB_name GRB141028A
GCN_number 16978
Detection_method Swift-XRT Other
ra 322.6008°
decl -0.2312°
Circular_text TITLE: GCN CIRCULAR NUMBER: 16978 SUBJECT: GRB 141028A: Swift/XRT detection of the X-ray afterglow DATE: 14/10/29 02:14:36 GMT FROM: Jamie A. Kennea at PSU/Swift-XRT J. A. Kennea (PSU), J. L. Racusin (NASA/GSFC) and C. Pagani (UL) report on behalf of the Swift Team: Swift-XRT has observed the error circle of the Fermi/LAT GRB 141028A in a series of observations tiled on the sky. The total exposure time is 2.0 ks spread over 7 fields; the maximum exposure within the sky observed was 766 s. The observations started 31.0 ks after the Fermi/LAT trigger. Within these data we detect a bright, uncatalogued X-ray source at RA, Dec= 322.60078, -0.23116 which is equivalent to: RA (J2000) = 21h 30m 24.19s Dec (J2000) = -00d 13' 52.2" with an uncertainty of 5.8 arcsec (radius, 90% confidence). The exposure at this location was 277 s. We note that this source is 4.8 arcsec from the position of the candidate MASTER afterglow position (GCN #16972) which has been confirmed to be fading by GROND (GCN #16977), and does not match any previously catalogued source. The source is significantly brighter than the RASS limit and therefore we suggest that this is the X-ray afterglow of GRB 141028A. More observations will be required to determine if the source is fading in X-rays. The results of the automatic processing for this source are available at http://www.swift.ac.uk/xrt_products/TILED_GRB00030/index_4.php This circular is an official product of the Swift-XRT team.
GCN 16979 table
GRB_name GRB141028A
GCN_number 16979
Detection_method Swift-UVOT Det
ra 322.6023°
decl -0.2312°
Circular_text TITLE: GCN CIRCULAR NUMBER: 16979 SUBJECT: GRB 141028A: Swift/UVOT Detection DATE: 14/10/29 03:58:53 GMT FROM: Mike Siegel at PSU/Swift MOC M. H. Siegel (PSU) and C. Pagani (UL) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 141028A 31037 s after the LAT trigger (Bissaldi et al., GCN Circ. 16969). We detect an optical afterglow consistent with the afterglow reported by MASTER (Gorbovsky et a., GCN, Circ 16972), GROND (Graham et al., GCN Circ. 16977) and the XRT (Kennea, et al., GCN Circ 16978). The preliminary UVOT position is: RA (J2000) = 21:30:24.54 = 322.60226 (deg.) Dec (J2000) = -00:13:52.4 = -0.23122 (deg.) with an estimated uncertainty of 0.4 arc sec. (radius, 90% confidence). This is consistent with the GROND and MASTER positions. Preliminary detection using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial exposure is: Filter T_start(s) T_stop(s) Exp(s) Mag u 31037 37759 233 19.14+-0.19 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.05 in the direction of the burst (Schlegel et al. 1998).
GCN 16980 table
GRB_name GRB141028A
GCN_number 16980
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 16980 SUBJECT: GRB 141028A: RATIR Optical and NIR Observations DATE: 14/10/29 04:12:02 GMT FROM: Eleonora Troja at GSFC Eleonora Troja (GSFC), Antonino Cucchiara (ORAU/GSFC), Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jos A. de Diego (UNAM), Leonid Georgiev (UNAM), Jess Gonzlez (UNAM), Carlos Romn-Ziga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report: We observed the field of the Fermi/LAT GRB 141028A (Bissaldi et al., GCN 16969, Roberts et al. GCN 16971) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org ) on the 1.5m Harold Johnson Telescope at the Observatorio Astronmico Nacional on Sierra San Pedro Mrtir from 2014/10 29.08 to 2014/10 29.13 UTC (from 13.62 to 14.82 hours after the Fermi-GBM trigger), obtaining a total of 1.07 hours exposure in the r, i and z bands. At the position of the XRT and optical counterparts (Kennea et al., GCN 16978, Gorbovskoy et al. GCN 16972, Graham et al. GCN 16977), in comparison with the SDSS DR9, we obtain the following detections: r 20.09 +/- 0.02 i 19.85 +/- 0.02 z 19.50 +/- 0.10 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 Astronmico Nacional in San Pedro Mrtir. [GCN OPS NOTE(29oct14)" Per author's request, the Subject-line was corrected from "29A" to "28A".]
GCN 16982 table
GRB_name GRB141028A
GCN_number 16982
Detection_method Other
redshift 1.8200
Circular_text TITLE: GCN CIRCULAR NUMBER: 16982 SUBJECT: GRB141028A: Gemini-North redshift DATE: 14/10/29 06:04:43 GMT FROM: Antonino Cucchiara at NASA/GSFC A. Cucchiara (NASA/GSFC) reports on behalf of a larger collaboration: We obtained a spectrum of the afterglow (Kennea et al., GCN 16978, Gorbovskoy et al. GCN 16972, Graham et al. GCN 16977, Siegel et al. GCN 16979) of the Fermi GRB 141028A (Bissaldi et al., GCN 16969, Roberts et al. GCN 16971) with the Gemini Multi-Object Spectrograph mounted on the 8 m Gemini-North telescope. Observations began at 05:07 UT on 2014 October 29 (~18. hr after the Fermi-GBM trigger) and cover the wavelength range from 3800-8200 A. We acquired 2x600s exposure using the R400 grism. We detect several absorption lines, including CrII2056,ZnII2056, FeII2260, FeII2344, FeII2586, FeII2600, MgII2706, MgII2803, and MgI 2853 at the common redshift of z=1.82. We therefore suggest this to be the redshift of GRB 141028A. We thank the Gemini-North staff for their terrific support, in particular A. Petric and A. Smith.
GCN 16983 table
GRB_name GRB141028A
GCN_number 16983
Detection_method Optical
redshift 2.3300
Circular_text TITLE: GCN CIRCULAR NUMBER: 16983 SUBJECT: GRB 141028A: VLT/X-shooter redshift of z=2.33 DATE: 14/10/29 08:15:25 GMT FROM: Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst D. Xu (DARK/NBI), A. J. Levan (Univ. Warwick), J. P. U. Fynbo (DARK/NBI), N. R. Tanvir (Univ. Leicester), V. D'Elia (ASI/ASDC and INAF/Roma), D. Malesani (DARK/NBI), report on behalf of a larger collaboration: We observed the optical afterglow (Gorbovskoy et al., GCN 16972; Graham et al., GCN 16977) of the Fermi/LAT GRB 141028A (Roberts, GCN 16971; Bissaldi et al., GCN 16969; Hurley et al., GCN 16975), using the X-shooter spectrograph at the ESO VLT. Observations started at 02:15 UT on 2014 Oct 29 (15.35 hr after the GRB), and consisted of 4x600 s exposures in each of the UVB, VIS, and NIR arms, covering the wavelength range 3000-25,000 AA. We detect a variety of absorption features throughout the entire spectrum. In particular, a wide trough is visible centered around 4050 AA, which we interpret as due to H I absorption at redshift z = 2.33. Identification of several metal features as due to, among others, Si II, C II, Fe II, C IV, Mg II, allows us to refine the value to z = 2.332. We note the presence of a strong intervening system at z = 1.823 (detected e.g. in C IV, Fe II, Mg II), and a weaker one at z = 2.09 (C IV). The former coincides with the system reported by Cucchiara et al. (GCN 16982). We acknowledge excellent support from the ESO observing staff at Paranal, in particular Cedric Ledoux and Dimitri Gadotti.
GCN 16985 table
GRB_name GRB141028A
GCN_number 16985
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 16985 SUBJECT: GRB 141028A: LCOGTN observations DATE: 14/10/29 11:39:20 GMT FROM: Drejc Kopac at Math Phys U,Slovenia D. Kopac (LJMU), J. Japelj (U. Ljubljana), C. Guidorzi (U. Ferrara), C. Mundell (LJMU), S. Dichiara (U. Ferrara), on behalf of a large collaboration report: Using the Las Cumbres Observatory Global Telescope Network (LCOGTN) we observed the field of Fermi GRB 141028A (Bissaldi et al., GCN 16969; Roberts, GCN 16971). Optical observations in r' and i' filters (5 x 120s sequences) were obtained with 1-m telescopes in Sutherland (South Africa) and Cerro Tololo (Chile). At the position of the MASTER telescope detection (Gorbovskoy et al., GCN 16972) we detect an un-catalogued source, consistent with GROND (Graham et al., 16977), UVOT (Siegel et al., GCN 16979) and RATIR detections (Troja et al., GCN 16980). Our preliminary photometry yields: Mid time from Total Exp Filter Magnitude trigger (hr) (s) ------------------------------------------------- 10.2 600 r' 19.4 +- 0.1 10.6 960 i' 19.3 +- 0.2 14.9 600 i' 19.9 +- 0.2 ------------------------------------------------ The magnitudes are calibrated against nearby SDSS stars and are not corrected for the Galactic foreground extinction. Further observations with the LCOGTN are scheduled.
GCN 16986 table
GRB_name GRB141028A
GCN_number 16986
Detection_method Swift-XRT Other
ra 322.6017°
decl -0.2314°
Circular_text TITLE: GCN CIRCULAR NUMBER: 16986 SUBJECT: GRB 141028A: Swift-XRT observations DATE: 14/10/29 16:39:33 GMT FROM: Claudio Pagani at U of Leicester C. Pagani, K. L. Page and P. A. Evans (U. Leicester) report on behalf of the Swift-XRT team: We have analysed 3.0 ks of XRT data for the Fermi/LAT-detected burst: GRB 141028A, from 31.0 ks to 71.7 ks after the Fermi/LAT trigger. The data are entirely in Photon Counting (PC) mode. An X-ray source is detected within the Fermi/LAT error circle. Using 348 s of PC mode data and 1 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 = 322.60168, -0.23145 which is equivalent to: RA (J2000): 21h 30m 24.40s Dec(J2000): -00d 13' 53.2" with an uncertainty of 4.0 arcsec (radius, 90% confidence). This position is 367 arcsec from the Fermi/LAT position (Bissaldi et al. GCN 16969) and consistent with the positions of the optical counterpart detected by MASTER (Gorbovskoy et al. GCN 16972), GROND (Graham et al. GCN 16977) and UVOT (Siegel et al. GCN 16979). The light curve can be modelled with a power-law decay with a decay index of alpha=2.0 (+/-1.0). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.5 (+/-0.5). The best-fitting absorption column is 1.8 (+2.2, -1.3) x 10^21 cm^-2, in excess of the Galactic value of 4.1 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.0 x 10^-11 (5.0 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 1.8 (+2.2, -1.3) x 10^21 cm^-2 Galactic foreground: 4.1 x 10^20 cm^-2 Excess significance: 1.8 sigma Photon index: 2.5 (+/-0.5) The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00020420. This circular is an official product of the Swift-XRT team.
GCN 16989 table
GRB_name GRB141028A
GCN_number 16989
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 16989 SUBJECT: GRB 141028A: P60 Observations and Decay Index DATE: 14/10/30 03:42:40 GMT FROM: S. Bradley Cenko at NASA/GSFC S. B. Cenko (NASA/GSFC) and D. A. Perley (Caltech) report on behalf of a larger collaboration: We have imaged the location of the optical afterglow (Gorbovskoy et al., GCN 16972) of the Fermi GBM (Roberts et al., GCN 16971) and LAT (Bissaldi et al., GCN 16969) GRB141028A with the robotic Palomar 60 inch telescope. Using nearby point sources from the Sloan Digital Sky Survey for reference, we measure the following r'-band magnitudes in our P60 images: r' = 20.09 +/- 0.06 at dt = 15.8 hr after the burst r' = 21.00 +/- 0.05 at dt = 39.3 hr after the burst Based on these observations, we infer a power-law decay index of alpha ~ 0.9.
GCN 16990 table
GRB_name GRB141028A
GCN_number 16990
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 16990 SUBJECT: GRB 141028A: Swift/UVOT followup observations DATE: 14/10/30 13:21:38 GMT FROM: Alice Breeveld at MSSL-UCL A. Breeveld (MSSL/UCL) and C. Pagani (U. Leicester) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 141028A 31037 s after the LAT trigger (Bissaldi et al., GCN Circ. 16969). A fading source is detected in the initial exposures (Siegel and Pagani, GCN Circ., 16979) in the position given in that circular, also consistent with MASTER (Gorbovsky et a., GCN, Circ 16972), GROND (Graham et al., GCN Circ. 16977) and the XRT (Pagani, et al., GCN Circ 16986). Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag u 31037 31179 140 19.0+-0.18 u 69790 72355 2525 20.7+-0.13 u 105469 127705 4880 21.3+-0.18 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.05 in the direction of the burst (Schlegel et al. 1998).
GCN 16991 table
GRB_name GRB141028A
GCN_number 16991
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 16991 SUBJECT: GRB 141028A: Continued RATIR Observations DATE: 14/10/30 16:13:49 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), Chris Klein (UCB), Ori Fox (UCB), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (ORAU/GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), José A. de Diego (UNAM), Leonid Georgiev (UNAM), Jesús González (UNAM), Carlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report: We observed the field of GRB 141028A (Bissaldi, et al., GCN 16969) 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 2014/10 30.08 to 2014/10 30.31 UTC (39.07 to 44.46 hours after the GBM trigger), obtaining a total of 4.24 hours exposure in the r, i, and z bands. For a source within the enhanced XRT error circle (Pagani et al., GCN 16986), in comparison with the SDSS DR9, we obtain the following detections: r 21.19 ± 0.04 i 20.79 ± 0.03 z 20.74 ± 0.24 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. A comparison to our previous observations (Troja et al., GCN 16980) shows that the afterglow faded with a power-law decay index of alpha ~ 0.9 in all three filters, consistent with the decay reported by Cenko & Perley (GCN 16989). Further observations are planned. We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.
GCN 16993 table
GRB_name GRB141028A
GCN_number 16993
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 16993 SUBJECT: GRB 141028A: SAO RAS Zeiss-1000 photometry DATE: 14/10/30 17:32:39 GMT FROM: Vladimir Sokolov at SAO RAS A.S. Moskvitin, V.N. Komarova, T.N. Sokolova and O.I. Spiridonova SAO RAS) report on behalf of the GRB follow-up team: We observed the field of GRB 141028A (Bissaldi et al., GCN 16969) with the SAO RAS 1-m telescope Zeiss-1000 on October, 29. The observations were started at 18:09:57 UT, ended at 19:40:42. We obtained 14 x 300 sec. images in the Rc filter. The OT discovered by the MASTER team (Gorbovskoy et al., GCN 16972) and observed by numerous telescopes is clearly detected in our stacked frame. The magnitude of OT is R = 20.6 +/- 0.1 in 8 hours since the Fermi trigger (in Vega system, not corrected for the Milky Way extinction). The photometry is based on the nearby USNO-B1 stars and checked with the other catalogues. On the occasion of the twenty-fifth anniversary of the Zeiss-1000 telescope we would like to thank our colleagues S.V. Drabek, V.V. Komarov, V.S. Shergin and V.V. Vlasyuk who have modernized the telescope control system and provided its reliable operation.
GCN 17030 table
GRB_name GRB141028A
GCN_number 17030
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 17030 SUBJECT: GRB 141028A: TShAO optical observation DATE: 14/11/05 20:23:23 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), A. Volnova (IKI), A. Khruslov (INASAN), A. Kusakin (Fesenkov Astrophysical Institute), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of GRB 141028A (Bissaldi et al., GCN 16969) with Zeiss-1000 (East) 1-m telescope of Tien Shan Astronomical Observatory on Oct., 29 starting on (UT) 15:58:47. We obtained several images in R-filter. In a combined image we clearly detect optical afterglow (Gorbovskoy et al., GCN 16972; Graham et al., GCN 16977). Details of the photometry are following: date UT start t-T0 Filter Exp. OT OT_err (mid, days) (s) 2014-10-29 15:58:47 1.2300 R 10*300 20.5 0.10 The photometry is based on following SDSS DR9 stars: SDSS_id R_Lupton J213021,99-001255,7 15.503 J213030,76-001427,8 17.205 J213035,56-001205,6 16.620
GCN 17035 table
GRB_name GRB141028A
GCN_number 17035
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 17035 SUBJECT: GRB 141028A: Mondy optical observations DATE: 14/11/07 08:08:50 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), A. Volnova (IKI), E. Klunko (ISTP), M. Eselevich (ISTP), I. Korobtsev (ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of GRB 141028A (Bissaldi et al., GCN 16969) with AZT-33IK telescope of Sayan observatory (Mondy) on Oct., 30 starting on (UT) 14:12:40. We obtained several images in R-filter. In a combined image we detect optical afterglow (Gorbovskoy et al., GCN 16972; Graham et al., GCN 16977). Details of the photometry are following: date UT start t-T0 Filter Exp. OT OT_err (mid, days) (s) 2014-10-30 14:12:40 2.1733 R 2520 21.66 0.22 The photometry is based on following SDSS DR9 stars: SDSS_id R_Lupton J213021,99-001255,7 15.503 J213030,76-001427,8 17.205 J213035,56-001205,6 16.620