GRB080810A

This page lists all entries on GRB080810A in GRBweb

Summary Fermi GBM IPN Swift GCN 8080 GCN 8081 GCN 8082 GCN 8083 GCN 8084 GCN 8085 GCN 8086 GCN 8087 GCN 8088 GCN 8089 GCN 8090 GCN 8091 GCN 8092 GCN 8093 GCN 8094 GCN 8095 GCN 8097 GCN 8098 GCN 8099 GCN 8100 GCN 8101 GCN 8102 GCN 8103 GCN 8105 GCN 8106 GCN 8722 GCN 8728

Summary table
Variable Value Source
GRB_name_Fermi GRB080810549
T0 13:10:09.381 UTC Fermi_GBM
ra 356.7928° Swift
decl 0.3198° Swift
pos_error 7.77e-05° Swift
T90 75.201 s Fermi_GBM
T90_error 3.638 s Fermi_GBM
T90_start 13:10:09.381 UTC Fermi_GBM
fluence 9.44e-06 erg/cm² Fermi_GBM
fluence_error 4.90e-08 erg/cm² Fermi_GBM
redshift 3.3500 GCN_circulars,Optical
T100 108.619 s
GBM_located False
mjd 54688.5487196875 Fermi_GBM
Fermi GBM table
GRB_name_Fermi GRB080810549
trigger_name bn080810549
ra 356.8000°
decl 0.3200°
pos_error 4.23e+00°
datum 2008-08-10
t_trigger 13:10:12.581 UTC
T90 75.201 s
T90_error 3.638 s
T90_start 13:10:09.381 UTC
fluence 9.44e-06 erg/cm²
fluence_error 4.90e-08 erg/cm²
flux_1024 3.69e+00 erg/cm²/s
flux_1024_error 2.42e-01 erg/cm²/s
flux_1024_time 2.37e+01 erg/cm²/s
flux_64 6.41e+00 erg/cm²/s
flux_64_error 1.19e+00 erg/cm²/s
IPN table
GRB_name GRB080810A
ra 356.7792°
decl 0.3167°
pos_error 5.00e-02°
redshift 3.3500
Swift table
GRB_name GRB080810A
t_trigger 13:10:12 UTC
ra 356.7928°
decl 0.3198°
pos_error 7.77e-05°
T90 106.0 s
fluence 4.60e-06 erg/cm²
redshift 3.3500
GCN 8080 table
GRB_name GRB080810A
GCN_number 8080
Detection_method Swift Det
t_trigger 13:10:12 UTC
ra 356.7790°
decl 0.3200°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8080 SUBJECT: GRB 080810: Swift detection of a burst with a bright optical afterglow DATE: 08/08/10 13:31:39 GMT FROM: David Burrows at PSU/Swift K. L. Page (U Leicester), S. D. Barthelmy (GSFC), D. N. Burrows (PSU), P. A. Evans (U Leicester), C. Guidorzi (INAF-OAB), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), N. P. M. Kuin (MSSL), J. Mao (INAF-OAB), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), M. Stamatikos (NASA/ORAU), R. L. C. Starling (U Leicester) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team: At 13:10:12 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 080810 (trigger=319584). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 356.779, +0.320 which is RA(J2000) = 23h 47m 07s Dec(J2000) = +00d 19' 11" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multiple-peaked structure with a duration of about 140 sec, including a peak during the time of the XRT/UVOT observations. The peak count rate was ~3000 counts/sec (15-350 keV), at ~22 sec after the trigger. The XRT began observing the field at 13:11:28.3 UT, 76.0 seconds after the BAT trigger. XRT found a bright, flaring, uncatalogued X-ray source located at RA, Dec 356.7936, +0.3188 which is equivalent to: RA(J2000) = 23h 47m 10.4s Dec(J2000) = +00d 19' 07.6" with an uncertainty of 4.7 arcseconds (radius, 90% containment). This location is 52 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy. UVOT took a finding chart exposure of nominal 100 seconds with the White (160-650 nm) filter starting 88 seconds after the BAT trigger. There is a bright candidate afterglow in the list of sources generated on-board at RA(J2000) = 23:47:10.5 = 356.79375 DEC(J2000) = +00:19:10 = +0.31944 with a 1-sigma error radius of about 1.0 arc sec. The estimated white magnitude is 14.7 with a 1-sigma error of about 0.5 mag. No correction has been made for a Galactic extinction corresponding to a reddening of 0.03 mag along the line of sight. We note the presence of the galaxy J234710.47+001906.0 about 1.7 arcsec from the XRT position. Burst Advocate for this burst is K. L. Page (kpa AT star.le.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 8081 table
GRB_name GRB080810A
GCN_number 8081
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 8081 SUBJECT: GRB 080810 : optical observation with KANATA DATE: 08/08/10 13:51:42 GMT FROM: Akira Arai at Hiroshima U Y. Ikejiri, M. Uemura, T. Ohsugi, K. Kawabata, A. Arai, M. Yamanaka, and K. Sakimoto (Hiroshima Univ.), report on behalf of the KANATA GRB team: We performed optical-NIR observations of the field of GRB 080810 (GCN Circ. 8080) with TRISPEC attached to the "KANATA" 1.5-m telescope. We confirmed a very bright, fading object at the position of the optical afterglow detected with UVOT. Our preliminary results are below: time(UT) mag. exposure_time Aug. 2008 (sec) 10.553258 13.7 $B!^(B 0.1 V 33sec * 1 Comparison star: 23:46:58.51 +00:18:30.2 V=14.07 (NOMAD) Further observation and analysis are ongoing.
GCN 8082 table
GRB_name GRB080810A
GCN_number 8082
Detection_method Swift-BAT Det
ra 356.7830°
decl 0.3100°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8082 SUBJECT: GRB 080810, Swift-BAT refined analysis DATE: 08/08/10 16:20:08 GMT FROM: Scott Barthelmy at NASA/GSFC T. Sakamoto (GSFC/UMBC), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), K. McLean (GSFC/UMD), K. L. Page (U Leicester), D. Palmer (LANL), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-239 to T+381 sec from the recent telemetry downlink, we report further analysis of BAT GRB 080810 (trigger #319584) (Page, et al., GCN Circ. 8080). The BAT ground-calculated position is RA, Dec = 356.783, 0.310 deg which is RA(J2000) = 23h 47m 08.0s Dec(J2000) = +00d 18' 35.1" with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 68%. The mask-weighted light curve shows a cluster of overlapping peaks starting at ~T-20, the tallest at T+25 sec, and ending at ~T+120 sec. T90 (15-350 keV) is 106 +- 5 sec (estimated error including systematics). The time-averaged spectrum from T-21.2 to T+111.4 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.34 +- 0.06. The fluence in the 15-150 keV band is 4.6 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+24.68 sec in the 15-150 keV band is 2.0 +- 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/319584/BA/
GCN 8083 table
GRB_name GRB080810A
GCN_number 8083
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 8083 SUBJECT: GRB 080810: Keck/HIRES Spectroscopy DATE: 08/08/10 17:51:26 GMT FROM: Jason Prochaska at UCO/Lick Obs J.X. Prochaska (UCSC), D. Perley (UCB), A. Howard (UCB), H.-W. Chen (Chicago), G. Marcy (UCB), D. Fischer (SFSU), and C. Wilburn (Keck) report on behalf of GRAASP: "We observed the afterglow of GRB 080810 with the Keck/HIRES echelle spectrometer for a series of 1000s exposures starting at UT 13:47:50 under good conditions. A quick analysis of the 2D images reveals a Lyman limit system at ~3975Ang. We tentatively associate this feature with the host galaxy of GRB 080810 and estimate a redshift z_GRB = 3.35. Further analysis is in progress." This GCN may be cited.
GCN 8084 table
GRB_name GRB080810A
GCN_number 8084
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 8084 SUBJECT: GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart DATE: 08/08/10 18:29:37 GMT FROM: Eli Rykoff at UCSB E.S. Rykoff (UCSB), reports on behalf of the ROTSE collaboration: ROTSE-IIIa, located at Siding Spring Observatory, Australia, responded to GRB 080810 (Swift trigger 319584, GCN 8080, Page et al.). The first image was at 13:10:47.6 UT, 35.3 s after the burst (21.6 s after the GCN notice time), contemporaneous with the gamma-ray emission (GCN 8082, Sakamoto et al.). We took 10 5s exposures, 10 20s exposures, and 137 60s exposures under variable conditions. The unfiltered images are calibrated relative to USNO B1.0. We detect a 12.8 magnitude, variable source with coordinates: 23:47:10.5 +00:19:11.5 (J2000) (uncertainty of 1" or better) start UT mag mlim(of image) ---------------------------------- 13:11:16.7 12.8 16.5 The position is consistent with the XRT and UVOT positions reported in GCN 8080. Our prompt detection shows the afterglow initially rising from 13.7 mag (38s post-burst) to a peak of 12.8 mag (67s post-burst). This is followed by a shallow decay from ~67s to ~230s (decay index alpha=-0.15+/-0.05), and a break to a steeper decay from ~230s to ~6000s post-burst (decay index alpha=-1.13+/-0.02). Preliminary analysis does not show any significant deviations from this smooth evolution. A jpeg image is available at http://www.rotse.net/images/gsb319584_3a02_img.jpg The object in question is marked with yellow and blue circles.
GCN 8085 table
GRB_name GRB080810A
GCN_number 8085
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 8085 SUBJECT: GRB 080810: KANATA optical-NIR observation, update DATE: 08/08/10 19:35:44 GMT FROM: Makoto Uemura at Hiroshima U M. Uemura, M. Yamanaka, Y. Ikejiri, K. Sakimoto, T. Ohsugi, K.S. Kawabata, and A. Arai, report on behalf of the KANATA GRB team: We continue the observation of GRB 080810 with the KANATA 1.5-m telescope. We obtained V, J, and Ks-band images of the field of the afterglow using TRISPEC. The latest observation shows: time(UT) mag. err exposure time Aug. 2008 10.78444 18.92V 0.05 123sec * 10 10.78479 17.53J 0.31 72sec * 10 The light curve we obtained can be described with a simple power-law decay between 420 and 20000 sec after the GRB trigger, without an apparent break. The power-law index is calculated to be 1.21+/-0.02. The index is slightly, but significantly larger than that reported in GCN 8084, implying a possible break around the very early or very late phase of our observation period. Further monitoring is encouraged.
GCN 8086 table
GRB_name GRB080810A
GCN_number 8086
Detection_method Swift-XRT Det
ra 356.7942°
decl 0.3200°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8086 SUBJECT: GRB 080810: Enhanced Swift-XRT position DATE: 08/08/10 22:50:44 GMT FROM: Phil Evans at U of Leicester P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team. Using 1614 s of XRT Photon Counting mode data and 3 UVOT images for GRB 080810, 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 = 356.79418, +0.32000 which is equivalent to: RA (J2000): 23h 47m 10.60s Dec (J2000): +00d 19' 12.0" 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 http://www.swift.ac.uk/xrt_positions/Goad.pdf), the current algorithm is an extension of this method. This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN 8087 table
GRB_name GRB080810A
GCN_number 8087
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 8087 SUBJECT: GRB 080810: Swift-XRT Team refined analysis DATE: 08/08/10 23:53:16 GMT FROM: Kim Page at U.of Leicester K.L. Page (U. Leicester) reports on behalf of the Swift-XRT team: We have analysed the first four orbits of the XRT data obtained for GRB 080810 (Page et al., GCN Circ. 8080). The first orbit (376 s) was taken entirely in Windowed Timing (WT) mode, followed by 2.8 of Photon Counting (PC) data. The UVOT-enhanced position was given by Evans et al. in GCN Circ. 8086. The WT data show a number of flares, with the strongest peaking around 107 and 209 s after the trigger; the first of these is also visible in the BAT data. The PC data in later orbits can be modelled with a single power-law decay, with alpha = 1.20 +0.12/-0.11. There is strong spectral evolution throughout the first orbit, as is typical for flaring activity. A spectrum extracted from the PC mode data (3.8-12.1 ks after the trigger) can be fitted with a power-law of Gamma = 1.98 +/- 0.06, absorbed by the Galactic column in this direction of 3.28x10^20 cm^-2. The observed (unabsorbed) flux over this time is 1.99 (2.20) x 10^-11 erg cm^-2 s^-1. If the decay continues with alpha = 1.2, the predicted count-rate at 24 hours is 0.02 count s^-1, corresponding to an observed (unabsorbed) flux of 8.5 (9.4) x 10^-13 erg cm^-2 s^-1. This is an official product of the Swift-XRT team.
GCN 8088 table
GRB_name GRB080810A
GCN_number 8088
Detection_method Optical
redshift 3.3500
Circular_text TITLE: GCN CIRCULAR NUMBER: 8088 SUBJECT: GRB 080810: RTT150 optical observations DATE: 08/08/11 06:49:28 GMT FROM: Rodion Burenin at IKI, Moscow R. Burenin (IKI), I. Khamitov (TUG), A. Galeev, I. Bikmaev, N. Sakhibullin (KSU/AST), M. Pavlinsky, R. Sunyaev (IKI), Z. Eker (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.) We observed the GRB 080810 afterglow with Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National Observatory, Turkey). We made a set of exposures in BVRI between 8.3 and 12.6 hours after the burst. During our observations the OT faded from 19.1 to 19.5 in R (USNO-B1.0 calibrated). We also obtained a set of low resolution spectra using TFOSC spectrometer. We detected Ly and other absorption lines and confirm the redshift z=3.35 measured by Prochaska et al. (GCN 8083). Further analysis is ongoing.
GCN 8089 table
GRB_name GRB080810A
GCN_number 8089
Detection_method Other
ra 356.7938°
decl 0.3198°
redshift 3.3500
Circular_text TITLE: GCN CIRCULAR NUMBER: 8089 SUBJECT: GRB 080810: Observations from NOT DATE: 08/08/11 07:15:29 GMT FROM: Antonio Deugarte at IAA-CSIC A. de Ugarte Postigo (ESO), C.C. Thoene, J.P.U. Fynbo, J. Hjorth (DARK/NBI), P. Jakobsson (U. Hertfordshire), Z. Banhidi (NOT, IAC), F. Grundahl, T. Arentoft (U. of Aarhus) report on behalf of a larger collaboration: We have observed the afterglow of GRB 080810 (Page et al. GCN 8080) from the Nordic Optical Telescope (NOT, Roque de los Muchachos Observatory, La Palma, Spain) using ALFOSC. The observations started on 10.9899 Aug (10.59 hours after the burst), when we measure an R-band magnitude of 19.1+/-0.2 (based on USNO-1B photometry). This value is in agreement with the slope decay measured by Rykoff (GCN 8084) implying that no break has been produced between both observations. This is also consistent with the magnitudes reported by Burenin et al. (GCN 8088). We obtained the following coordinates for the afterglow (J2000+/-0.5"): R.A.: 23:47:10.51 Dec.: +00:19:11.3 This value is slightly off from the value provided by UVOT (Page et al. GCN 8080) but fully consistent with the one given by Rykoff (GCN 8084). We also obtained spectroscopic observations of the afterglow, where we clearly detect Ly-alpha absorption, a flux drop blueward of the Lyman break as well as other absorption lines, including the CIV/CIV doublet at a redshift of z~3.35, in agreement to what was reported by Prochaska et al. (GCN 8083) and Burenin et al. (GCN 8088).
GCN 8090 table
GRB_name GRB080810A
GCN_number 8090
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 8090 SUBJECT: GRB 080810: OSN follow-up DATE: 08/08/11 08:12:32 GMT FROM: Antonio Deugarte at IAA-CSIC A. de Ugarte Postigo (ESO), F. Aceituno, A.J. Castro-Tirado (IAA-CSIC) report on behalf of a larger collaboration: We have observed the field of GRB 080810 (Page et al. GCN 8080) with the 1.5m OSN telescope at Sierra Nevada Observatory (Granada, Spain), covering the range between 11.93 and 15.11 hours after the burst in B, V, R and I bands. We observe a continuous decay following a slope of alpha = -1.11+/-0.02, consistent with the slope provided by Rykoff et al. (GCN 8084). Preliminary analysis shows the following magnitudes in an intermediate epoch as compared to reference stars derived from the SDSS. t-t0(h) Filter Mag 13.82 B 21.4 +/- 0.3 13.62 V 20.2 +/- 0.2 13.85 R 19.5 +/- 0.2 13.25 I 19.2 +/- 0.2
GCN 8091 table
GRB_name GRB080810A
GCN_number 8091
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 8091 SUBJECT: GRB 080810: Kanazawa optical observation DATE: 08/08/11 08:16:50 GMT FROM: Daisuke Yonetoku at Kanazawa U Y.Okuma, H.Fujimoto, T.Nashimoto, A.Wada, D.Yonetoku, T. Murakami, report on behalf of the Kanazawa GRB team: We have imaged the field of GRB 080810 (Page et al. GCN 8080) in R-band with 0.4m telescope at Kanazawa Japan. We obtained the first image at one and half hours after the Swift trigger. We confirmed the bright optical counter part reported by Page et al. (GCN 8080), Ikejiri et al. (GCN 8081), and so on. Compared with the USNO-A2.0 catalog, the source magnitude is determined about 16.5 +/- 0.2 mag with 30 seconds exposure time from the begining of this observation. Further analysis is in progress.
GCN 8092 table
GRB_name GRB080810A
GCN_number 8092
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 8092 SUBJECT: GRB 080810: D50 optical observation DATE: 08/08/11 10:14:35 GMT FROM: Matus Kocka at Monteboo Obs,Masaryk U,Brno M. Kocka (kocka@sunkl.asu.cas.cz), M. Nekola, J. Strobl, R. Hudec, C. Polasek (AsU CAS - Ondrejov), M. Jelinek, P. Kubanek (IAA-CSIC - Granada), F. Munz (IASF/INAF - Bologna) The 0.5m D50 telescope in the Ondrejov Observatory of the Astronomical Institute of the Academy of Sciences of the Czech Republic, observed GRB 080810.Observation started at 22:26:41 UT (~9.4 hours after SWIFT detection). After 80x20 sec exposure we detected optical counterpart at the coordinates: 23:47:10.5 +00:19:11.5 (J2000)(E.S. Rykoff GCN 8084) Calibrated to near USNO-B1.0 catalog star with the following results: time(UT) mid of exp mag. err exposure time 22:39:02 19.6 0.5 80x20 sec image: http://zeus.asu.cas.cz/~koci/grb080810/GRB080810.jpg D50 telescope is controled by RTS2 software. Further analysis is in progress This message may be cited.
GCN 8093 table
GRB_name GRB080810A
GCN_number 8093
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 8093 SUBJECT: GRB 080810: Liverpool Telescope observations DATE: 08/08/11 10:14:52 GMT FROM: Cristiano Guidorzi at INAF-OAB C. Guidorzi (INAF-OAB), I. Steele (LJMU), N. Tanvir (U. Leicester) on behalf of a larger collaboration report: On 2008 August 11 (03:53:56 UT) we began observing the field of GRB 080810 (Page et al. GCN Circ. 8080) with the Liverpool Telescope using the r' and i' filters. The optical afterglow is clearly detected at the position reported by ROTSE-III (Rykoff GCN Circ. 8084) and the NOT (de Ugarte Postigo et al. GCN Circ. 8089). We found the following magnitudes: Telescope Filter T_mid[hr] Exposure[s] Mag ------------------------------------------------------------- LT i' 14.770 300 19.14 +/- 0.04 LT r' 15.328 300 19.93 +/- 0.04 ------------------------------------------------------------- The calibration was performed using the R2 and I magnitudes of the following nearby USNOB1 catalogue star: 23:47:06.819, +00:19:27.15, using R2=15.31, I=14.69.
GCN 8094 table
GRB_name GRB080810A
GCN_number 8094
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 8094 SUBJECT: GRB 080810: optical observations DATE: 08/08/11 10:23:24 GMT FROM: Alexei Pozanenko at IKI, Moscow M. Andreev, (Terskol Branch of Institute of Astronomy), Ju. Babina (CrAO), V. Petkov, A. Kurenya (BNO INR RAS), A. Pozanenko (IKI) on behalf of larger GRB follow up collaboration report: We observed the afterglow of GRB080810 (Page et al. GCN 8080) with Zeiss-600 of Mt.Terskol observatory in R-band on Aug. 11. The afterglow is detected in a combined image in a position consistent with coordinates reported by Rykoff (GCN 8084). A photometry of the OT against USNO-B1.0 stars is following: T0+ Exposure R_mag (mid) 0.45598 d 8x180 s 19.4 +/- 0.2
GCN 8095 table
GRB_name GRB080810A
GCN_number 8095
Detection_method Swift-UVOT Other
ra 356.7937°
decl 0.3198°
redshift 3.3500
Circular_text TITLE: GCN CIRCULAR NUMBER: 8095 SUBJECT: GRB 080810: Swift/UVOT Refined Analysis DATE: 08/08/11 17:31:57 GMT FROM: Stephen Holland at USRA/NASA/GSFC/SSC S. T. Holland (CRESST/USRA/GSFC) & K. L. Page (U Leicester) report on behalf of the Swift/UVOT team: The Swift/UVOT observed the field of GRB 080810 starting 65 s after the BAT trigger (Page et al., GCNC. 8080). Settled observations started at T + 85 s. We detect the optical afterglow (Page et al., GCNC 8080) in the v, b, and white filters at the UVOT-enhanced location of the XRT afterglow (Evans et al., 2008, GCNC 8086). The refined UVOT source position is RA (J2000) = 23:47:10.48 Dec (J2000) = +00:19:11.3 with an estimated uncertainty of +/-0.6 arcsec (radius, 90% confidence). This is consistent with the positions of the optical afterglow reported by Rykoff (GCNC 8084) and de Ugarte Postigo (GCNC 8089) Magnitudes and upper limits are reported below. Filter T_start (s) T_stop Exposure Mag Err Comment white 85 185 98 14.63 0.07 v 191 459 264 14.06 0.06 b 4432 4632 197 17.85 0.08 u 4227 68,686 727 >21.4 3-sigma UL uvw1 4022 68,283 3099 >22.3 3-sigma UL uvm2 3817 62,540 3229 >22.2 3-sigma UL uvw2 4843 50,866 1510 >22.0 3-sigma UL The above magnitudes are not corrected for the Galactic extinction corresponding to a reddening of E_{B-V} = 0.03 mag (Schlegel et al., 1998, ApJS, 500, 525). The photometry is on the UVOT photometric system described in Poole et al. (2008, MNRAS, 383,627). The non-detections in the u, uvw1, uvm2, and uvw2 filters are consistent with a redshift of z = 3.35 (Prochaska, GCNC 8083). The power-law decay index in the b band between 4532 and 27,387 s is -1.29 +/- 0.22. [GCN OPS NOTE(10sep08): Per author's request, the RA value was changed from 23:47:10.26" to "23:47:10.48".]
GCN 8097 table
GRB_name GRB080810A
GCN_number 8097
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 8097 SUBJECT: GRB080810: MITSuME optical observation DATE: 08/08/12 09:27:10 GMT FROM: Michitoshi Yoshida at Okayama Astrophysical Obs M. Yoshida, K. Yanagisawa, D. Kuroda, Y. Shimizu, S. Nagayama, H. Toda (OAO, NAOJ) and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We observed the optical afterglow (Ikejiri et al. GCN 8081; Rykoff GCN 8084) of GRB 080810 (Page et al. GCN 8080) with the optical three color (g', Rc and Ic) imager attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory. Photometric results are listed below. We used USNO-B1.0 stars for flux calibration. Mid-UT exp-T g' Rc Ic -------------------------------------------------------------- 2008-08 10.60244 300 sec 17.16+/-0.06 16.70+/-0.04 15.69+/-0.05 --------------------------------------------------------------
GCN 8098 table
GRB_name GRB080810A
GCN_number 8098
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 8098 SUBJECT: GRB 080810: RTT150 optical observations DATE: 08/08/12 14:03:36 GMT FROM: Irek Khamitov at TUG A. Galeev (KSU/AST), I. Khamitov (TUG), I. Bikmaev, N. Sakhibullin (KSU/AST), R. Burenin, M. Pavlinsky, R. Sunyaev (IKI), Z. Eker (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.) report: We observed the GRB 080810 afterglow with Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National Observatory, Turkey). The serie of 600 sec (Ic), 600 sec (Rc), 900 sec (V) exposures was made by using TFOSC instrument under moderate seeing, starting at 12 Aug 2008, 01:19 UT, i.e. 36.16 hours after the burst. The OT is clearly detected on all images. Using USNO-B1.0 stars we estimate an Rc magnitude of 20.66+/-0.03 (~36.4 hours after the burst). Using our earlier observations (Burenin et al., GCN8088) the calculated power law index is -0.91+/-0.09 for decay from ~8.3 h to ~36.4 h. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.
GCN 8099 table
GRB_name GRB080810A
GCN_number 8099
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 8099 SUBJECT: GRB 080810: Liverpool and Faulkes North observations DATE: 08/08/12 15:32:08 GMT FROM: Cristiano Guidorzi at INAF-OAB C. Guidorzi (INAF-OAB), D. Bersier (LJMU) and N. Tanvir (U. Leicester) report on behalf of a larger collaboration: We observed GRB 080810 (Page et al. GCN Circ. 8080) with the 2 m Liverpool and Faulkes North telescopes starting on August 11 (23:34:09 UT) and 12 (13:14:49 UT), respectively, with r' and i' filters. We clearly detect the afterglow with the following magnitudes: Telescope Filter T_mid[hr] Exposure[s] Mag ------------------------------------------------------------- LT i' 34.657 6x300 20.01 0.06 LT r' 39.525 6x300 20.78 0.05 FTN i' 48.367 5x300 20.38 0.04 ------------------------------------------------------------- The calibration was performed using nearby USNOB1 stars as described in our previous report (Guidorzi et al. GCN Circ. 8093). Combining with our previous observation, we derive a power-law index of 0.94 0.05 from 15 to 48 hr post burst, thus confirming the flattening of the optical decay, in agreement with Galeev et al. (GCN Circ. 8098).
GCN 8100 table
GRB_name GRB080810A
GCN_number 8100
Detection_method Swift Other
ra 357.1800°
decl -4.6100°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8100 SUBJECT: GLAST Burst Monitor detection of GRB 080810 DATE: 08/08/12 21:02:21 GMT FROM: Charles Meegan at NASA/MSFC C.A. Meegan (NASA/MSFC), J. Greiner (MPE), N.P. Bhat (UAH), E. Bissaldi (MPE), M.S. Briggs (UAH), V. Connaughton (UAH), R. Diehl (MPE), G.J. Fishman (NASA/MSFC), L. Gibby (NASA/MSFC), A.S. Hoover (LANL), A.J. van der Horst (NASA/ORAU), A. von Kienlin (MPE), R.M. Kippen (LANL), C. Kouveliotou (NASA/MSFC), G.G. Lichti (MPE), S. McBreen (MPE), W.S. Paciesas (UAH), R.D. Preece (UAH), H. Steinle (MPE), M.S. Wallace (LANL), and C.A. Wilson-Hodge (NASA/MSFC)report: "At 13:10:12 UT on 10 August 2008, the GLAST Burst Monitor (GBM) triggered and located GRB 080810 (GBM 080810.549, trigger 240066613), which was also detected by Swift (Page et al., GCN 8080). The on-ground calculated location, using the GBM trigger data, is RA, Dec 357.18, -4.61 which is equivalent to RA(J2000) = 23h 49m Dec(J2000) = -4d 37' with an uncertainty of 5.0 degrees (radius, 1-sigma containment, statistical only). The angle from the Large Area Telescope (LAT) boresight is 61 degrees. The GBM light curve shows a slow rise starting at T0-20, followed by a main emission phase comprising 5 pulses, a quiescent period and a sixth pulse at T0+102 s. The time-averaged spectrum from T-0.5 to T+53.1 sec is best fit by a power law function with an exponential high energy cutoff. The cutoff energy is 313.5 +/-73.6 keV and the power law index is -0.91 +/-0.12, with a reduced chi-square of 1.1 for 226 degrees of freedom. The fluence in the 50-300 keV band is (6.9 +/- 0.5) x 10^-6 erg/cm2. The 1-sec photon flux measured from T+23.5 sec in the 50-300 keV band is 1.85 +/- 0.16 ph/cm2/sec. All the quoted errors are at the 90% confidence level."
GCN 8101 table
GRB_name GRB080810A
GCN_number 8101
Detection_method Konus-Wind Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 8101 SUBJECT: GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis DATE: 08/08/12 21:24:11 GMT FROM: Takanori Sakamoto at NASA/GSFC T. Sakamoto (GSFC/UMBC), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), K. McLean (GSFC/UMD), D. Palmer (LANL), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), and T. Ukwatta (GWU) on behalf of the Swift-BAT team: V. Pal'shin, S. Golenetskii, R.Aptekar, E. Mazets, D. Frederiks, and T. Cline on behalf of the Konus-Wind team, Report: We performed the Konus-Wind and the Swift/BAT joint spectral analysis of GRB 080810 (Swift/BAT trigger #319584; Page et al., GCN Circ. 8080). Since the Konus-Wind observed this GRB in the waiting mode, we only have 3 channel spectral data for the Konus-Wind. However, the Konus-Wind data covers the energy range from 20 keV to 1 MeV. Therefore, the joint spectral analysis of the Konus-Wind and the Swift/BAT data enables to derive the broad-band spectral parameters of this burst. The time interval of the spectral data for each instrument is chosen from T0(BAT)-18.6 to T0(BAT)+60.8 sec where T0(BAT) is the trigger time of BAT at 13:10:12.3 UTC. This time interval includes most of the burst emission, but not the last pulse around T0(BAT)+~100 sec which is clearly visible in the BAT data (Sakamoto et al., GCN Circ. 8082). The energy ranges which we used in the joint spectral analysis are 20-1000 keV and 14-150 keV for the Konus-Wind and the Swift/BAT respectively. The spectral data of two instruments are fit with the spectral model multiplied by the constant factor to take into account the systematic uncertainties in the response matrices of each instrument. The spectrum is well fit with a power-law with exponential cutoff model (dN/dE ~ E^{alpha} * exp(-(2+alpha)*E/Epeak)). The constant factors of each instrument agree within 20%. No systematic residual from the best fit model is seen in the spectral data of each instrument. The best fit spectral parameters are: alpha = -1.2 +- 0.1 and Epeak = 550 (-230/+860) keV (chi2/dof = 41/58). The best fit spectral parameters for the Band function fixing beta=-2.5 are: alpha = -1.2 +- 0.1 and Epeak = 580 (-260/+850) keV (chi2/dof = 41/58). The energy fluence in the 15-1000 keV band calculated by a power-law with exponential cutoff model for this 79.5 sec interval is 1.7 (-0.2/+0.1) x 10^-5 erg/cm2 (assuming the constant factor of the BAT is fixed to 1). Assuming z = 3.35 (Prochaska et al., GCN Circ. 8083; Burenin et al., GCN Circ. 8088) and a standard cosmology model with H_0 = 71 km/s/Mpc, Omega_M = 0.27, Omega_Lambda = 0.73, the isotropic energy release is E_iso ~5 x 10^53 erg in 1 keV to 10 MeV at the GRB rest frame extrapolating the best fit model spectrum. All the quoted errors are at the 90% confidence level.
GCN 8102 table
GRB_name GRB080810A
GCN_number 8102
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 8102 SUBJECT: GRB 080810: RTT150 optical observations DATE: 08/08/13 13:46:42 GMT FROM: Irek Khamitov at TUG A. Galeev (KSU/AST), I. Khamitov (TUG), I. Bikmaev, N. Sakhibullin (KSU/AST), R. Burenin, M. Pavlinsky, R. Sunyaev (IKI), Z. Eker (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.) report: We observed the GRB 080810 afterglow (Page et al. GCN Circ. 8080) with Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National Observatory, Turkey). The series of several exposures in V,Rc,Ic bands were made by using Andor CCD starting at 13 Aug 2008, 00:24 UT, i.e. ~ 59.23 hours after the burst. Using USNO-B1.0 stars we estimate an Rc magnitude of 21.60+/-0.05 (~59.85 hours after the burst). This measurement deviates from the power law decay with index -0.9 (Galeev et al., GCN8098,Guidorzi et al, GCN8099), that indicates steeper fading of OT after 48h. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.
GCN 8103 table
GRB_name GRB080810A
GCN_number 8103
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 8103 SUBJECT: Radio detection of GRB 080810 with the VLA DATE: 08/08/13 17:57:01 GMT FROM: Poonam Chandra at U Virginia/NRAO P. Chandra (UVA/NRAO) and D. A. Frail (NRAO) report on behalf of the Caltech-NRAO-Carnegie GRB Collaboration: "We observed the field centered at the UVOT position of the Swift burst GRB 080810 (GCN 8080) using the Very Large Array (VLA) at a frequency of 8.46 GHz and starting at 2008 Aug 13.36 UT. We detect the radio flux at the GRB afterglow position with the flux density of 151 50 uJy. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc."
GCN 8105 table
GRB_name GRB080810A
GCN_number 8105
Detection_method Optical
ra 23.0000°
decl 0.0000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8105 SUBJECT: GRB080810: optical observations DATE: 08/08/16 02:20:14 GMT FROM: Alexei Pozanenko at IKI, Moscow V. Rumyantsev, Yu. Efimov (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the optical afterglow of GRB080810 (Page et al., GCN 8080) in R-band on Aug.10 between (UT) 23:17:05 - 23:48:32 with AZT-8 telescope of CrAO. The afterglow is detect in a separate images in coordinates RA(J2000) = 23 47 10.4, Dec(J2000) = +00 19 11.0 with uncertainty 0.5". The coordinates are consistent with reported early (Page et al. GCN 8080, Rykoff GCN 8084, A. de Ugarte Postigo et al. GCN 8090). Based on USNO-B1.0 star RA (J2000) = 23 47 11.12, Dec. (J2000) = +00 16 38.30, R=16.30 we estimated brightness of the optical afterglow: T0+, Exposure, R_mag, err (mid time) 0.4331 d 15x120 s 19.20 +/- 0.05
GCN 8106 table
GRB_name GRB080810A
GCN_number 8106
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 8106 SUBJECT: GRB080810 - optical observations DATE: 08/08/16 21:42:53 GMT FROM: Christina Thoene at Niels Bohr Institute,DARK Cosmo Ctr Christina C. Thoene (DARK/NBI), Antonio de Ugarte Postigo (ESO) and Christine Liebig (ARI Heidelberg) report: We observed the field of GRB 080810 (Page et al. GCN 8080) with the Danish 1.54m telescope on La Silla/Chile on August 15.40 UT and 16.31 UT (4.85 and 5.76 days after the burst onset). We detect the decaying afterglow at preliminary R-band magnitudes of 22.8+/-0.3 and 23.2+/-0.5. Using the R band and unfiltered magnitudes published in GCNs (Rykoff et al. GCN 8084, Burenin et al. GCN 8088, de Ugarte Postigo et al. GCN 8089 & 8090, Okuma et al. GCN 8091, Kocka et al. GCN 8092, Guidorzi et al. GCN 8093 & 8099, Andreev et al. GCN 8094, Yoshida et al. GCN 8097, Galeev et al. GCN 8098 & 8102, Rumyantsev et al. GCN 8105) together with the data of our own observations we find that the light curve can be described by a powerlaw of index alpha = 1.12 +/- 0.02 between 400s and 1 day after the burst. After 1 day there is a flux excess that can be seen both in the optical and X-ray light curves (explaining the flattening measured by Galeev et al., GCN8098 and Guidorzi et al., GCN8099), after which the light curve begins to decay more steeply with an index in the optical of alpha = 1.8 +/- 0.3. Hail, thunderstorm and heavy rain currently prevent further observations from the DK 1.54m. C. Thoene and C. Liebig acknowledge the excellent cheese fondue at the Swiss telescope yesterday evening.
GCN 8722 table
GRB_name GRB080810A
GCN_number 8722
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 8722 SUBJECT: GRB 080810: optical observations DATE: 08/12/24 14:21:54 GMT FROM: Alexei Pozanenko at IKI, Moscow A. Volnova (SAI MSU), I. Korobtsev (ISTP), A. Pozanenko (IKI), E. Klunko (ISTP), N. Bochkarev (SAI MSU), E. Karitskaja (Institute of Astronomy), on behalf of larger GRB follow up collaboration report: We observed the afterglow of GRB 080810 (Page et al. GCN 8080) with 1.5 m telescope of Sayan observatory (Mondy) under good weather conditions. Series of R and B images were obtained between Aug. 10 (UT) 16:50:03 -18:17:06. While we clearly detect afterglow in single R images, the afterglow is not detected in a combined image obtained in B. A photometry of the combined images is based on several SDSS nearby stars: T0+ Filter Exp. mag. Upper_Limit seeing mid., days (3 sigma) 0.1599 B 14x60 n/d 19.26 ~2.7" 0.1786 R 30x60 17.98 +/- 0.13 20.85 ~2.2" 0.2026 R 30x60 18.10 +/- 0.17 21.14 ~2.0" The photometry in R-band is an agreement with power law decay index of light curve (alpha = 1.12) between 400 s and 1 day after the burst reported by Thoene et al (GCN 8106).
GCN 8728 table
GRB_name GRB080810A
GCN_number 8728
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 8728 SUBJECT: GRB 080810: optical observations DATE: 08/12/25 18:17:47 GMT FROM: Alexei Pozanenko at IKI, Moscow A. Volnova (SAI MSU), R. Karimov (MAO), A. Pozanenko (IKI), M. Ibrahimov (MAO) on behalf of larger GRB follow up collaboration report: We observed the afterglow of GRB 080810 (Page et al. GCN 8080) with AZT-22 (1.5 m) telescope of Maidanak observatory (MAO) in R band on Aug. 12 (UT) (20:18:17 - 21:07:58) and Aug. 14 (20:26:35 - 21:33:00). A photometry of combined images is based on several SDSS DR6 field stars: T0+ Filter Exp. mag. UL mid., days (3 sigma) 2.315 R 2700 21.36 +/-0.09 23.10 4.326 R 3600 n/d 22.30 The photometry in R-band is an agreement with power law decay index (alpha = 1.8) reported by Thoene et al (GCN 8106) for this phase of the light curve.