GRB080727C

This page lists all entries on GRB080727C in GRBweb

Summary Fermi GBM IPN Swift GCN 8035 GCN 8036 GCN 8038 GCN 8040 GCN 8041 GCN 8043 GCN 8044 GCN 8047 GCN 8050

Summary table
Variable Value Source
GRB_name_Fermi GRB080727964
T0 23:07:32.905 UTC Fermi_GBM
ra 32.6341° Swift
decl 64.1373° Swift
pos_error 1.94e-04° Swift
T90 89.089 s Fermi_GBM
T90_error 6.476 s Fermi_GBM
T90_start 23:07:32.905 UTC Fermi_GBM
fluence 1.33e-05 erg/cm² Fermi_GBM
fluence_error 7.91e-08 erg/cm² Fermi_GBM
T100 89.089 s
GBM_located False
mjd 54674.96357528935 Fermi_GBM
Fermi GBM table
GRB_name_Fermi GRB080727964
trigger_name bn080727964
ra 32.6000°
decl 64.1000°
pos_error 3.13e+00°
datum 2008-07-27
t_trigger 23:07:46.217 UTC
T90 89.089 s
T90_error 6.476 s
T90_start 23:07:32.905 UTC
fluence 1.33e-05 erg/cm²
fluence_error 7.91e-08 erg/cm²
flux_1024 3.53e+00 erg/cm²/s
flux_1024_error 1.79e-01 erg/cm²/s
flux_1024_time 1.42e+01 erg/cm²/s
flux_64 6.44e+00 erg/cm²/s
flux_64_error 9.18e-01 erg/cm²/s
IPN table
GRB_name GRB080727C
ra 32.6458°
decl 64.1500°
pos_error 5.00e-02°
Swift table
GRB_name GRB080727C
t_trigger 23:07:35 UTC
ra 32.6341°
decl 64.1373°
pos_error 1.94e-04°
T90 79.7 s
fluence 5.20e-06 erg/cm²
GCN 8035 table
GRB_name GRB080727C
GCN_number 8035
Detection_method Swift Det
t_trigger 23:07:35 UTC
ra 32.6450°
decl 64.1510°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8035 SUBJECT: GRB 080727C: Swift detection of a burst DATE: 08/07/27 23:28:30 GMT FROM: Scott Barthelmy at NASA/GSFC A. M. Parsons (GSFC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), D. N. Burrows (PSU), S. T. Holland (CRESST/USRA/GSFC), E. A. Hoversten (PSU), S. D. Hunsberger (PSU), J. A. Kennea (PSU), C. B. Markwardt (CRESST/GSFC/UMD), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), D. Perez (U Leicester), T. Sakamoto (NASA/UMBC), R. L. C. Starling (U Leicester), M. C. Stroh (PSU) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team: At 23:07:35 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 080727C (trigger=318170). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 32.645, +64.151 which is RA(J2000) = 02h 10m 35s Dec(J2000) = +64d 09' 05" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows multiple peaks with a duration of about 100 sec. The peak count rate was ~3500 counts/sec (15-350 keV), at ~25 sec after the trigger. The XRT began observing the field at 23:08:47.9 UT, 72.5 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source with an enhanced position: RA, Dec 32.63384, 64.13771 which is equivalent to: RA(J2000) = 02h 10m 32.12s Dec(J2000) = +64d 08' 15.8" with an uncertainty of 2.8 arcseconds (radius, 90% containment). This location is 50 arcseconds from the BAT onboard position, within the BAT error circle. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (6.78e+21 cm^-2, Kalberla et al. 2005), with an excess column of 7.7 (+7.98/-6.22) x 10^21 cm^-2 (90% confidence). The initial flux in the 2.5 s image was 1.30e-09 erg cm^-2 s^-1 (0.2-10 keV). UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 81 seconds after the BAT trigger. No afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 18.5 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the large, but uncertain extinction expected. We note that the Galactic latitude of this source is 2.6 deg, but we believe this to be a GRB based on the BAT and XRT lightcurves and the spectral information. Burst Advocate for this burst is A. M. Parsons (parsons AT milkyway.gsfc.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/too.html.)
GCN 8036 table
GRB_name GRB080727C
GCN_number 8036
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 8036 SUBJECT: GRB080727C: RTT150 optical observations DATE: 08/07/28 02:23:06 GMT FROM: Irek Khamitov at TUG I. Bikmaev (KSU/AST), I. Khamitov (TUG), N. Sakhibullin (KSU/AST), Z. Eker (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.) R. Burenin, M. Pavlinsky, R. Sunyaev (IKI), report: The field of GRB 080727C (GCN 8035, SWIFT trigger=318170) was observed with Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National Observatory, Turkey), starting at 28 July, 00:58 UT, i.e. ~2 hours after the burst, using Andor CCD. We made 2*900 sec exposures in the R band and 900 sec exposure in the I band. We found no new source within XRT error circle. Using USNO-B1 stars we estimated frame limits as R~23.0 mag, I~21.5 mag. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.
GCN 8038 table
GRB_name GRB080727C
GCN_number 8038
Detection_method Swift-XRT Det
ra 32.6349°
decl 64.1375°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8038 SUBJECT: GRB 080727C: Enhanced Swift-XRT position DATE: 08/07/28 07:40:27 GMT FROM: Phil Evans at U of Leicester J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team. Using 1905 s of XRT Photon Counting mode data and 1 UVOT images for GRB 080727C, 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 = 32.63485, +64.13754 which is equivalent to: RA (J2000): 02h 10m 32.36s Dec (J2000): +64d 08' 15.2" with an uncertainty of 1.5 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 8040 table
GRB_name GRB080727C
GCN_number 8040
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 8040 SUBJECT: GRB 080727C: Liverpool Telescope observations DATE: 08/07/28 10:01:03 GMT FROM: Cristiano Guidorzi at INAF-OAB C. Guidorzi (INAF-OAB), S. Kobayashi, M.J. Burgdorf (Liverpool JMU) and N. Tanvir (U. Leicester) report on behalf of a larger collaboration: On 2008 July 28 (01:35:55 UT) we began observing the field of GRB 080727C (Parsons et al. GCN Circ. 8035) with the Liverpool Telescope. Observations consisted of 6x300s exposures acquired using the SDSS-i' filter. In our coadded frame we do not detect any source inside the refined XRT error box (Osborne et al. GCN Circ. 8038) down to the limiting magnitude reported below. Telescope Filter T_mid[s] Exposure[s] M_lim (3-sigma) ------------------------------------------------------------- Liverpool SDSS-i' 9830 6x300 22.8 ------------------------------------------------------------- The calibration was performed using the I magnitudes of several USNOB-1 catalogue field objects. The value derived by us is consistent with that given by Bikmaev et al. (GCN Circ. 8036).
GCN 8041 table
GRB_name GRB080727C
GCN_number 8041
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 8041 SUBJECT: GRB 080727C: Swift XRT refined analysis DATE: 08/07/28 11:53:51 GMT FROM: Rhaana Starling at U of Leicester R.L.C. Starling (U. Leicester) and A.M. Parsons (GSFC) report on behalf of the Swift XRT team: We have analysed the first five orbits of Swift XRT data for GRB 080727C (trigger=318170, Parsons et al. GCN Circ. 8035) beginning at T0+79 s until T0+22.6 ks. The enhanced XRT position is given in Osborne et al. (GCN Circ. 8038). Up to approximately T0+110 s the light curve appears to be flat. Thereafter the light curve can be fitted with a broken power law with alpha1 = 1.5+/-0.1, breaking at Tbk = 740 +1880/-370 s to a slightly shallower decay of alpha2 = 1.2 +0.1/-0.3. The Photon Counting mode spectrum consisting of 502 s of data during the first orbit is well fitted with an absorbed power law of photon index Gamma = 1.4+/-0.3 and intrinsic absorption (assuming z=0) of N_H = (1.2 +0.5/-0.2) e22 cm-2 in addition to the high Galactic absorption in this direction of N_H = 6.8e21 cm-2 (Kalberla et al. 2005). We measure an average observed (unabsorbed) 0.3-10 keV flux over this time of 1.1e-10 (1.7e-10) erg/cm2/s corresponding to an observed count rate to flux conversion of 1 count/s = 9.9e-11 erg/cm2/s. The predicted count rate at T+24 hr is 0.001 count/s corresponding to an observed 0.3-10 keV flux of 1.35e-13 erg/cm2/s, assuming the decay continues with alpha=1.2. This is an official product of the Swift-XRT team.
GCN 8043 table
GRB_name GRB080727C
GCN_number 8043
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 8043 SUBJECT: GRB 080727C: Swift/UVOT Upper Limits DATE: 08/07/28 19:41:18 GMT FROM: Erik Hoversten at Swift/Penn State E. A. Hoversten (PSU) and A. M. Parsons (GSFC) report on behalf of the Swift/UVOT team: The Swift/UVOT began observing the field of GRB 080727C starting 82 seconds after the BAT trigger (Parsons, et al. GCN Circ. 8035). We do not detect any source in any of the filters at the UVOT-enhanced XRT position (Osborne, et al., GCN Circ. 8038). The 3-sigma upper limits at this position for single exposures are: Filter T_start T_stop Exp(s) Mag (3-sigma upper limit) ----------------------------------------------------- white 82.1 181.0 97.3 > 20.81 white 3987.1 4186.8 196.6 > 21.58 v 187.4 587.2 393.5 > 19.89 v 4397.7 4597.5 196.6 > 19.93 b 668.8 673.4 4.6 > 17.79 u 643.0 662.8 19.5 > 18.32 uvw1 618.4 638.2 19.5 > 18.11 uvm2 593.5 613.3 19.5 > 17.61 uvw2 4192.9 4392.7 196.6 > 20.17 The quoted upper limits have not been corrected for the expected Galactic extinction along the line of sight corresponding to a large reddening of E_{B-V} = 1.1 mag. All photometry is on the UVOT flight system described in Poole et al. (2008, MNRAS, 383, 627).
GCN 8044 table
GRB_name GRB080727C
GCN_number 8044
Detection_method Swift-BAT Det
ra 32.6380°
decl 64.1300°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8044 SUBJECT: GRB 080727C, Swift-BAT refined analysis DATE: 08/07/28 20:46:16 GMT FROM: Scott Barthelmy at NASA/GSFC E. Fenimore (LANL), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC), J. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), K. McLean (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), 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+843 sec from recent telemetry downlinks, we report further analysis of BAT GRB 080727C (trigger #318170) (Parsons, et al., GCN Circ. 8035). The BAT ground-calculated position is RA, Dec = 32.638, 64.130 deg which is RA(J2000) = 02h 10m 33.2s Dec(J2000) = +64d 07' 48.6" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 77%. The mask-weighted light curve shows several overlapping peaks starting at ~T-5 sec and ending at ~T+200 sec. T90 (15-350 keV) is 79.7 +- 8.8 sec (estimated error including systematics). The time-averaged spectrum from T-3.3 to T+116.3 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 0.87 +- 0.20, and Epeak of 143.2 +- 50.0 keV (chi squared 66 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 5.2 +- 0.2 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+15.23 sec in the 15-150 keV band is 2.3 +- 0.2 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.30 +- 0.05 (chi squared 81 for 57 d.o.f.). 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/318170/BA/
GCN 8047 table
GRB_name GRB080727C
GCN_number 8047
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 8047 SUBJECT: GRB 080727C: TAROT Calern observatory optical observations DATE: 08/07/29 11:55:52 GMT FROM: Bruce Gendre at LAM-OAMP Gendre, B. (LAM/CNRS), Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report: We imaged the field of GRB 080727 detected by SWIFT (trigger 318170) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France. The observations started 790.7s after the GRB trigger (765.8s after the notice). The elevation of the field increased from from 38 degrees above horizon and weather conditions were good. The date of trigger : t0 = 2008-07-27T23:07:35.040 At the enhanced XRT position given by Osborne et al. (GCN #8038) we do not detect any optical transient. We co-added a series of exposures: t0+857.5s to t0+1850.1s : R > 18.5 Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction. N.B. Galactic coordinates are lon=131.4275 lat= +2.5930 and the galactic extinction in R band is 2.8 magnitudes estimated from D. Schlegel et al. 1998ApJ...500..525S. This message may be cited.
GCN 8050 table
GRB_name GRB080727C
GCN_number 8050
Detection_method Suzaku WAM Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 8050 SUBJECT: GRB 080727C: Suzaku WAM observation of the prompt emission DATE: 08/08/01 11:12:42 GMT FROM: Kazutaka Yamaoka at Aoyama Gakuin U K. Yamaoka, S. Sugita (Aoyama Gakuin U.), M. Ohno, M. Kokubun, M. Suzuki, T. Takahashi (ISAS/JAXA), Y.E. Nakagawa, T. Tamagawa (RIKEN), T. Uehara, T. Takahashi, Y. Fukazawa, C. Kira, Y. Hanabata (Hiroshima U.), M. Tashiro, Y. Terada, Y. Urata, A. Endo, K. Onda, N. Kodaka, K. Morigami, T. Sugasahara, W. Iwakiri (Saitama U.), T. Enoto, K. Nakazawa, K. Makishima (Univ. of Tokyo), E. Sonoda, M. Yamauchi, H. Tanaka, R. Hara, N. Ohmori (Univ. of Miyazaki), S. Hong (Nihon U.), on behalf of the Suzaku WAM team, report: The long 080727C (Swift/BAT trigger #318170; Parsons et al., GCN 8035) triggered the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 23:07:51.558 UT (=T0). The observed light curve shows two peaks, starting at T0-13s, ending at T0+70s, with a duration (T90) of about 54 seconds. The fluence in 150 - 1000 keV was (6.0 +/- 0.7) x 10^-6 erg/cm^2. The 1-s peak flux measured from T0+9s was 0.78 +/- 0.12 photons/cm^2/s in the same energy range. Preliminary result shows that the time-averaged spectrum from T0-7s to T0+47s is fitted by a single power-law with a photon index of 1.83 +/- 0.18 in the 150 - 1000 keV range (chi^2/d.o.f = 6.1/11). All the quoted errors are at statistical 90% confidence level, in which the systematic uncertainties are not included. The light curves with 1/64 sec time resolution for this burst are now available at: http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html