GRB131024A

This page lists all entries on GRB131024A in GRBweb

Summary IPN Swift GCN 15365 GCN 15367 GCN 15369 GCN 15370 GCN 15372 GCN 15373 GCN 15375

Summary table
Variable Value Source
T0 12:26:20 UTC GCN_circulars,Swift Det
ra 290.4820° Swift
decl -64.6027° Swift
pos_error 1.81e-04° Swift
T90 112.0 s Swift
T90_start 12:26:20 UTC Swift
fluence 1.20e-06 erg/cm² Swift
T100 112.0 s
GBM_located False
mjd 56589.51828703703 GCN_circulars,Swift Det
IPN table
GRB_name GRB131024A
ra 290.4625°
decl -64.6000°
pos_error 5.00e-02°
Swift table
GRB_name GRB131024A
t_trigger 12:26:20 UTC
ra 290.4820°
decl -64.6027°
pos_error 1.81e-04°
T90 112.0 s
fluence 1.20e-06 erg/cm²
GCN 15365 table
GRB_name GRB131024A
GCN_number 15365
Detection_method Swift Det
t_trigger 12:26:20 UTC
ra 290.4640°
decl -64.6030°
Circular_text TITLE: GCN CIRCULAR NUMBER: 15365 SUBJECT: GRB 131024A: Swift detection of a burst DATE: 13/10/24 12:37:23 GMT FROM: David Palmer at LANL J. L. Racusin (NASA/GSFC), D. N. Burrows (PSU), N. Gehrels (NASA/GSFC), H. A. Krimm (CRESST/GSFC/USRA), A. Maselli (INAF-IASFPA), K. L. Page (U Leicester), D. M. Palmer (LANL), P. Romano (INAF-IASFPA), M. H. Siegel (PSU), E. Troja (NASA/GSFC/UMCP) and T. N. Ukwatta (MSU) report on behalf of the Swift Team: At 12:26:20 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 131024A (trigger=575707). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 290.464, -64.603 which is RA(J2000) = 19h 21m 51s Dec(J2000) = -64d 36' 08" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). As is usual with an image trigger, the available BAT light curve shows no significant structure. The XRT began observing the field at 12:28:34.2 UT, 133.5 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source located at RA, Dec 290.48228, -64.60181 which is equivalent to: RA(J2000) = 19h 21m 55.75s Dec(J2000) = -64d 36' 06.5" with an uncertainty of 4.0 arcseconds (radius, 90% containment). This location is 28 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. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 4.45 x 10^20 cm^-2 (Kalberla et al. 2005). UVOT took a finding chart exposure of 150 seconds with the White filter starting 136 seconds after the BAT trigger. No credible 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 19.6 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 expected extinction corresponding to E(B-V) of 0.05. Burst Advocate for this burst is J. L. Racusin (judith.racusin 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/too.html.)
GCN 15367 table
GRB_name GRB131024A
GCN_number 15367
Detection_method Swift-XRT Det
ra 290.4825°
decl -64.6028°
Circular_text TITLE: GCN CIRCULAR NUMBER: 15367 SUBJECT: GRB 131024A: Enhanced Swift-XRT position DATE: 13/10/24 17:00:03 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 1446 s of XRT Photon Counting mode data and 2 UVOT images for GRB 131024A, 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 = 290.48247, -64.60275 which is equivalent to: RA (J2000): 19h 21m 55.79s Dec (J2000): -64d 36' 09.9" with an uncertainty of 1.8 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 15369 table
GRB_name GRB131024A
GCN_number 15369
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 15369 SUBJECT: GRB 131024A: Skynet R-COP optical observations DATE: 13/10/24 19:12:32 GMT FROM: Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet A. Trotter, J. Haislip, D. Reichart, A. Verveer, T. Spuck, A. LaCluyze, N. Frank, J. Moore, T. Berger, H. T. Cromartie, R. Egger, A. Foster, K. Ivarsen, M. Maples, M. Nysewander, E. Speckhard, and J. A. Crain report: Skynet observed the Swift/XRT localization of the field of GRB 131024A (Racusin et al., GCN 15365, Swift trigger # 575707) with the 14-inch R-COP telescope at Perth Observatory, Australia, starting at 2013-10-24, 12:28:14 UT and continuing until 14:25 UT (t=1.9-118m post trigger). R-COP took a total of 44x20-80s exposures simultaneously in the BRI bands. In a stack of 2 early R-band images at a mean time t=6.9m we marginally detect (S/N~3.5 sigma) an uncataloged source in the R band within the XRT error circle, with R~18.9 mag. In later stacks at mean times ~70-80m, we obtain only 3-sigma upper limits in all three bands: band t(mean) exp mag B 69m 9x80s >19.2 R 80m 12x80s >19.8 I 83m 16x80s >18.9 Magnitudes are in the Vega system, calibrated to four APASS-DR7 stars in the field, and have not been corrected for line-of-sight Milky Way dust extinction, with expected E(B-V)=0.05 (Schlegel et al. 1998). No further Skynet observations are scheduled.
GCN 15370 table
GRB_name GRB131024A
GCN_number 15370
Detection_method Swift-BAT Det
ra 290.5440°
decl -64.5990°
Circular_text TITLE: GCN CIRCULAR NUMBER: 15370 SUBJECT: GRB 131024A, Swift-BAT refined analysis DATE: 13/10/24 20:47:07 GMT FROM: Hans Krimm at NASA-GSFC S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC), D. M. Palmer (LANL), J. L. Racusin (NASA/GSFC), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-239 to T+303 sec from the recent telemetry downlink, we report further analysis of BAT GRB 131024A (trigger #575707) (Racusin, et al., GCN Circ. 15365). The BAT ground-calculated position is RA, Dec = 290.544, -64.599 deg which is RA(J2000) = 19h 22m 10.5s Dec(J2000) = -64d 35' 54.8" with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 78%. The burst started during a pre-planned slew. Low-level emission begins around T-150 sec. Then there is a first peak from T-70 to T-50 sec, a second peak from T-15 to T-4 sec and a third peak from T-2 to T+20 sec. We note that there is a gap in the currently available data from ~T-140 to T-120 sec. T90 (15-350 keV) is 112.00 +- 36 sec (estimated error including systematics). The time-averaged spectrum from T-111.00 to T+17.00 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.85 +- 0.18. The fluence in the 15-150 keV band is 1.2 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-55.50 sec in the 15-150 keV band is 0.3 +- 0.1 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/575707/BA/
GCN 15372 table
GRB_name GRB131024A
GCN_number 15372
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 15372 SUBJECT: GRB 131024A: Swift-XRT refined Analysis DATE: 13/10/25 00:37:06 GMT FROM: Phil Evans at U of Leicester A. Maselli (INAF-IASFPA), A. Melandri (INAF-OAB), V. Mangano (PSU), M.C. Stroh (PSU), D.N. Burrows (PSU), P.A. Evans (U. Leicester), B.P. Gompertz (U. Leicester), J.P. Osborne (U. Leicester), B. Sbarufatti (INAF-OAB/PSU) and J.L. Racusin report on behalf of the Swift-XRT team: We have analysed 6.5 ks of XRT data for GRB 131024A (Racusin et al. GCN Circ. 15365), from 151 s to 24.0 ks after the BAT trigger. The data comprise 20 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN. Circ 15367). The light curve can be modelled with a power-law decay with a decay index of alpha=0.46 (+/-0.05). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.08 (+0.18, -0.17). The best-fitting absorption column is 7.7 (+3.7, -3.2) x 10^20 cm^-2, consistent with the Galactic value of 4.4 x 10^20 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.4 x 10^-11 (4.3 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 7.7 (+3.7, -3.2) x 10^20 cm^-2 Galactic foreground: 4.4 x 10^20 cm^-2 Excess significance: <1.6 sigma Photon index: 2.08 (+0.18, -0.17) If the light curve continues to decay with a power-law decay index of 0.46, the count rate at T+24 hours will be 0.036 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.2 x 10^-12 (1.6 x 10^-12) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00575707. This circular is an official product of the Swift-XRT team.
GCN 15373 table
GRB_name GRB131024A
GCN_number 15373
Detection_method GROND
Circular_text TITLE: GCN CIRCULAR NUMBER: 15373 SUBJECT: GRB 131024A: GROND upper limits DATE: 13/10/25 02:06:46 GMT FROM: Vladimir Sudilovsky at MPE V. Sudilovsky, K. Varela, D. A. Kann and J. Greiner (all MPE Garching) report on behalf of the GROND team: We observed the field of the GRB 131024A (Racusin et al., GCN #15365) simultaneously in g'r'i'z'JHKs with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at La Silla Observatory (Chile). Observations started at 00:20 UT on 25 October 2013, 12 hours after the GRB. They were performed at an average seeing of 1.6" and at an average airmass of 1.4. Based on two co-added observations with individual exposure times of 1500s in g'r'i'z' and 1200s in JHK, we do not detect any source with the enhanced XRT circle (Osborne et al., GCN #15367) down to preliminary limiting magnitudes (all in the AB system): g' > 25.1 mag, r' > 24.7 mag, i' > 23.9 mag, z' > 23.8 mag, J > 21.6 mag, H > 21.0 mag, K > 20.0 mag. We do note there is a marginally detected source in r' at roughly 1.6" north-east of the center of the error circle. Magnitudes are calibrated against GROND zeropoints (griz) and 2MASS stars (JHK), and are not corrected for the Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.04 mag in the direction of the burst (Schlegel et al. 1998).
GCN 15375 table
GRB_name GRB131024A
GCN_number 15375
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 15375 SUBJECT: GRB 131024A: Swift/UVOT Upper Limits DATE: 13/10/25 03:21:43 GMT FROM: Mike Siegel at PSU/Swift MOC M. H. Siegel (PSU) and J. L. Racusin (NASA/GSFC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 131024A 137 s after the BAT trigger (Racusin et al., GCN Circ. 15365). No optical afterglow consistent with the enhanced XRT position (Osborne et al., GCN Circ. 15367) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white (fc) 136 286 147 >20.63 white 136 1542 392 >21.69 v 624 1592 116 >18.91 b 550 1517 97 >19.75 u (fc) 294 544 245 >19.99 u 294 1492 569 >20.49 uvw1 673 1468 97 >19.15 uvm2 648 1606 106 >18.99 uvw2 600 1567 116 >19.48 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).