GRB080916B

This page lists all entries on GRB080916B in GRBweb

Summary IPN Swift GCN 8240 GCN 8242 GCN 8247 GCN 8250 GCN 8252 GCN 8260

Summary table
Variable Value Source
T0 14:44:47 UTC GCN_circulars,Swift Det
ra 163.6657° Swift
decl 69.0661° Swift
pos_error 1.04e-04° Swift
T90 32.0 s Swift
T90_start 14:44:47 UTC Swift
fluence 6.30e-07 erg/cm² Swift
T100 32.0 s
GBM_located False
mjd 54725.614432870374 GCN_circulars,Swift Det
IPN table
GRB_name GRB080916B
ra 163.6250°
decl 69.0500°
pos_error 5.00e-02°
Swift table
GRB_name GRB080916B
t_trigger 14:44:47 UTC
ra 163.6657°
decl 69.0661°
pos_error 1.04e-04°
T90 32.0 s
fluence 6.30e-07 erg/cm²
GCN 8240 table
GRB_name GRB080916B
GCN_number 8240
Detection_method Swift Det
t_trigger 14:44:47 UTC
ra 163.6240°
decl 69.0440°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8240 SUBJECT: GRB 080916B: Swift detection of a burst DATE: 08/09/16 14:55:24 GMT FROM: Jamie A. Kennea at PSU/Swift-XRT G. Stratta (ASDC), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), C. Guidorzi (INAF-OAB), S. T. Holland (CRESST/USRA/GSFC), E. A. Hoversten (PSU), S. D. Hunsberger (PSU), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), J. Mao (INAF-OAB), C. B. Markwardt (CRESST/GSFC/UMD), F. E. Marshall (NASA/GSFC), P. T. O'Brien (U Leicester), S. R. Oates (UCL-MSSL), J. P. Osborne (U Leicester), K. L. Page (U Leicester), M. Perri (ASDC), B. Preger (ASDC), R. L. C. Starling (U Leicester), M. C. Stroh (PSU) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team: At 14:44:47 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 080916B (trigger=324907). The BAT on-board calculated location is RA, Dec 163.624, +69.044 which is RA(J2000) = 10h 54m 30s Dec(J2000) = +69d 02' 39" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 50 sec. The peak count rate was ~750 counts/sec (15-350 keV), at ~0 sec after the trigger. Due to an observing constraint, Swift will not slew until T0+18.9 minutes. There will be no XRT or UVOT data until this time. Burst Advocate for this burst is G. Stratta (giulia.stratta AT asdc.asi.it). 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 8242 table
GRB_name GRB080916B
GCN_number 8242
Detection_method Swift-XRT Other
ra 163.6656°
decl 69.0657°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8242 SUBJECT: GRB 080916B: Swift-XRT afterglow detection DATE: 08/09/16 15:36:21 GMT FROM: Matteo Perri at ISAC/ASDC G. Stratta, M. Perri, P. Evans report on behalf of the Swift-XRT Team: The XRT began observing the field at 15:07:22.2 UT, 1354.9 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 163.66560, 69.06574 which is equivalent to: RA(J2000) = 10h 54m 39.74s Dec(J2000) = +69d 03' 56.7" with an uncertainty of 3.7 arcseconds (radius, 90% containment). This location is 94 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 consistent with the Galactic value of 1.8e+20 cm^-2 (Kalberla et al. 2005).
GCN 8247 table
GRB_name GRB080916B
GCN_number 8247
Detection_method Swift-XRT Det
ra 163.6651°
decl 69.0654°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8247 SUBJECT: GRB 080916B: Enhanced Swift-XRT position DATE: 08/09/16 19:40:44 GMT FROM: Phil Evans at U of Leicester M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team. Using 1049 s of XRT Photon Counting mode data and 1 UVOT images for GRB 080916B, 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 = 163.66512, +69.06545 which is equivalent to: RA (J2000): 10h 54m 39.63s Dec (J2000): +69d 03' 55.6" with an uncertainty of 5.1 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 8250 table
GRB_name GRB080916B
GCN_number 8250
Detection_method Swift-BAT Det
ra 163.6320°
decl 69.0610°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8250 SUBJECT: GRB 080916B, Swift-BAT refined analysis DATE: 08/09/16 20:55:15 GMT FROM: Scott Barthelmy at NASA/GSFC 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), D. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), G. Stratta (ASDC), J. Tueller (GSFC), T. Ukwatta (GWU) (i.e. the Swift-BAT team) report: Using the data set from T-239 to T+617 sec from the recent telemetry downlink, we report further analysis of BAT GRB 080916B (trigger #324907) (Strata, et al., GCN Circ. 8240). The BAT ground-calculated position is RA, Dec = 163.632, 69.061 deg, which is RA(J2000) = 10h 54m 31.6s Dec(J2000) = +69d 03' 38.2" with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 53%. The mask-weighted light curve shows a weak FRED-like peak starting at ~T-4 sec, peaking at ~T+3 sec, and ending at ~T+50 sec. There is a possibility of very weak emission lasting out to at least T+350 sec, at which time the spacecraft slewed away fro the burst location. T90 (15-350 keV) is 32 +- 8 sec (estimated error including systematics). The time-averaged spectrum from T-3.3 to T+35.7 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.49 +- 0.23. The fluence in the 15-150 keV band is 6.3 +- 0.9 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+3.30 sec in the 15-150 keV band is 0.6 +- 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/324907/BA/
GCN 8252 table
GRB_name GRB080916B
GCN_number 8252
Detection_method Swift-UVOT Other
ra 163.6658°
decl 69.0661°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8252 SUBJECT: GRB 080916B: Swift UVOT Refined Analysis DATE: 08/09/17 00:42:53 GMT FROM: Erik Hoversten at Swift/Penn State E. A. Hoversten (PSU) and G. Stratta (ASDC) report on behalf of the Swift UVOT team: The Swift/UVOT began settled observations of the field of GRB 080916B, 1359s after the BAT trigger (Stratta et al., GCN 8240). There is a possible detection of an afterglow in the UVOT white filter at: RA (J2000) 10:54:39.78 Dec (J2000) 69: 3:57.9 with an estimated uncertainty of 0.8 arcsec (radius, 90% confidence). This position is consistent with the UVOT enhanced XRT position (Evans et al., GCN 8247). The afterglow candidate does not appear in the DSS images, and photometry from the second orbit of Swift observations suggests that it has faded. UVOT magnitudes and 3-sigma upper limits are reported in the following table: Filter T_start T_stop Exp(s) Mag (3-sigma upper limit) ----------------------------------------------------- white 1359.0 1458.8 98.2 20.50 +/- 0.21 white 7826.0 8025.7 196.6 > 21.27 v 1340.9 2920.7 342.1 > 19.62 b 1516.3 2676.5 155.6 > 20.32 u 1491.6 2651.7 155.6 > 19.91 uvw1 1467.3 2627.3 155.5 > 19.91 uvm2 1604.9 3076.8 285.0 > 20.06 uvw2 1556.0 2716.0 155.5 > 19.91 The quoted upper limits have not been corrected for the expected Galactic extinction along the line of sight of E_{B-V} = 0.02 mag. All photometry is on the UVOT flight system described in Poole et al. (2008, MNRAS, 383, 627).
GCN 8260 table
GRB_name GRB080916B
GCN_number 8260
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 8260 SUBJECT: GRB 080916B: Swift-XRT refined analysis DATE: 08/09/17 15:17:17 GMT FROM: Matteo Perri at ISAC/ASDC G. Stratta, M. Perri, B. Preger (ASDC) report on behalf of the Swift-XRT team: We have analyzed the first two orbits of Swift XRT data of GRB 080916B (Stratta et al., GCN Circ. 8242), consisting of 2.8 ks of Photon Counting data collected starting from 22.8 min after the burst. During the XRT observation, from T0+1.4 ks to T0+8.5 ks, the source shows a fading behaviour from 0.08 cts/s to 0.02 cts/s. Assuming a power law model, the best fit decay index is alpha = 1.0 0.2. At this rate we predict a count rate level of 1.7 x 10-3 cts/s one day after the trigger. The 0.3-10 keV extracted spectrum (2.8 ks of integration time) is consistent with an absorbed power law model. Fixing the column density to the Galactic value (NH = 1.8 x 1020 cm-2 from Kalberla et al. 2007) the best fit photon index is 2.0 0.5. The observed 0.3-10.0 keV flux is (1.0+/-0.6) x 10-12 erg cm-2 s-1 which corresponds to an unabsorbed flux of 1.1 x 10-12 erg cm-2 s-1. The count to observed flux conversion factor is 6.6 x 10-11 erg cm-2 count-1. This Circular is an official product of the Swift-XRT team.