GRB090429A

This page lists all entries on GRB090429A in GRBweb

Summary IPN Swift GCN 9280 GCN 9287 GCN 9289 GCN 9297 GCN 9303 GCN 9304 GCN 9308 GCN 9318

Summary table
Variable Value Source
T0 4:53:39 UTC GCN_circulars,Swift Det
ra 90.5554° Swift
decl -52.3874° Swift
pos_error 4.01e-04° Swift
T90 188.0 s Swift
T90_start 4:53:39 UTC Swift
fluence 1.00e-06 erg/cm² Swift
T100 188.0 s
GBM_located False
mjd 54950.20392361111 GCN_circulars,Swift Det
IPN table
GRB_name GRB090429A
ra 90.5583°
decl -52.3833°
pos_error 5.00e-02°
Swift table
GRB_name GRB090429A
t_trigger 4:53:39 UTC
ra 90.5554°
decl -52.3874°
pos_error 4.01e-04°
T90 188.0 s
fluence 1.00e-06 erg/cm²
GCN 9280 table
GRB_name GRB090429A
GCN_number 9280
Detection_method Swift Det
t_trigger 4:53:39 UTC
ra 90.5590°
decl -52.3860°
Circular_text TITLE: GCN CIRCULAR NUMBER: 9280 SUBJECT: GRB 090429: Swift detection of a burst DATE: 09/04/29 05:29:46 GMT FROM: David Palmer at LANL C. B. Markwardt (CRESST/GSFC/UMD), S. D. Barthelmy (GSFC), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), B. A. Rowlinson (U Leicester), M. H. Siegel (PSU), M. Stamatikos (NASA/ORAU) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team: At 04:53:39 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 090429 (trigger=350853). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 90.559, -52.386 which is RA(J2000) = 06h 02m 14s Dec(J2000) = -52d 23' 09" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a broad peak with a duration of about 25 sec. The peak count rate was ~700 counts/sec (15-350 keV), at ~5 sec after the trigger. The XRT began observing the field at 04:54:38.0 UT, 58.1 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 90.5548, -52.3855 which is equivalent to: RA(J2000) = 06h 02m 13.15s Dec(J2000) = -52d 23' 07.8" with an uncertainty of 5.1 arcseconds (radius, 90% containment). This location is 9.4 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 150 seconds with the White filter starting 66 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 0.06. Because this burst was detected as part of the sub-threshold program (see GCN 8943) with a BAT image significance of only 5.64 sigma, GCN notices were not generated until the source was confirmed using XRT data. Burst Advocate for this burst is C. B. Markwardt (Craig.Markwardt 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 9287 table
GRB_name GRB090429A
GCN_number 9287
Detection_method Swift-XRT Other
ra 90.5568°
decl -52.3886°
Circular_text TITLE: GCN CIRCULAR NUMBER: 9287 SUBJECT: GRB 090429A - Correction to XRT position DATE: 09/04/29 11:35:56 GMT FROM: Phil Evans at U of Leicester P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: The onboard XRT position for GRB 090429A (Markwardt et al. GCN. Circ 9280) delivered as an XRT position notice and given in GCN 9280 was incorrect. Inspection of the images reveals a cosmic ray 52 arcsec from the GRB which affected the onboard centroid. The correct position of the XRT afterglow is: RA, Dec= 90.5568, -52.3886 which is equivalent to: RA(J2000) = 06 02 13.63 Dec(J2000) = -52 23 18.9 with an uncertainty of 4.8 arcsec (radius, 90% confidence). This circular is an official product of the Swift-XRT team.
GCN 9289 table
GRB_name GRB090429A
GCN_number 9289
Detection_method Swift-BAT Det
ra 90.5730°
decl -52.3890°
Circular_text TITLE: GCN CIRCULAR NUMBER: 9289 SUBJECT: GRB 090429A: Swift-BAT refined analysis DATE: 09/04/29 11:56:38 GMT FROM: Scott Barthelmy at NASA/GSFC S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), A. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-61 to T+302 sec from the recent telemetry downlink, we report further analysis of BAT GRB 090429A (trigger #350853) (Markwardt, et al., GCN Circ. 9280). The BAT ground-calculated position is RA, Dec = 90.573, -52.389 deg, which is RA(J2000) = 06h 02m 17.5s Dec(J2000) = -52d 23' 19.0" with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%. The mask-weighted light curve shows a relatively smooth structure with a couple overlapping peaks starting at ~T-12 sec and peaking at T_zero. The main peak ends around T+40 sec with a long weak tail extending out to ~T+200 sec. T90 (15-350 keV) is 188 +- 37 sec (estimated error including systematics). The time-averaged spectrum from T-10.8 to T+203.0 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.55 +- 0.22. The fluence in the 15-150 keV band is 1.0 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-0.35 sec in the 15-150 keV band is 0.6 +- 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/350853/BA/
GCN 9297 table
GRB_name GRB090429A
GCN_number 9297
Detection_method Swift-XRT Det
ra 90.5547°
decl -52.3876°
Circular_text TITLE: GCN CIRCULAR NUMBER: 9297 SUBJECT: GRB 090429A: Enhanced Swift-XRT position DATE: 09/04/29 18:20:30 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 945 s of XRT Photon Counting mode data and 1 UVOT images for GRB 090429A, 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 = 90.55469, -52.38758 which is equivalent to: RA (J2000): 06h 02m 13.13s Dec (J2000): -52d 23' 15.3" with an uncertainty of 3.2 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, arXiv:0812.3662). This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN 9303 table
GRB_name GRB090429A
GCN_number 9303
Detection_method GROND
Circular_text TITLE: GCN CIRCULAR NUMBER: 9303 SUBJECT: GRB 090429A: GROND upper limits DATE: 09/04/30 09:16:41 GMT FROM: Thomas Kruehler at MPE/MPI F. Olivares, T. Kruehler, J. Greiner (all MPE) report on behalf of the GROND team: We observed the field of GRB 090429A (Swift trigger 350853, Markwardt et al.,GCN #9280) simultaneously in g'r'i'z'JHK with GROND mounted at the 2.2m ESO/MPI telescope at La Silla Observatory (Chile). Observations started on 30 Apr. 2009 at 01:05 UT, 20.2 h after the burst, and consisted of a set of images with a total integration time of 28 min in JHK and 32 min in g'r'i'z'. In stacked images we do not detect any object inside the enhanced XRT errorcircle (Evans et al., GCN #9297) down to the following AB magnitudes: g' > 23.4 r' > 23.3 i' > 22.6 z' > 22.2 J > 21.8 H > 20.7 K > 20.0 These upper limits have been obtained using 2MASS field stars and the GROND zeropoints as reference.
GCN 9304 table
GRB_name GRB090429A
GCN_number 9304
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 9304 SUBJECT: GRB 090429A: Swift-XRT refined analysis DATE: 09/04/30 10:39:40 GMT FROM: Phil Evans at U of Leicester P.A. Evans (U. Leicester) and C. B. Markwardt (CRESST/GSFC/UMD) report on behalf of the Swift-XRT team: We have analysed 6 ks of XRT data for GRB 090429A (Markwardt et al. GCN Circ. 9280). The first observation comprises a continuous observation from T0+64 s to T0+255 s with the data entirely in Windowed Timing (WT) mode. The second observation covers the range T0+35 to T0+64 ks, and contains 5.8 ks of Photon Counting (PC) mode data. The enhanced XRT position for this burst was given by Evans et al. (GCN. Circ 9297). The first observation shows a number of flares superimposed on a short, initial rise which breaks at T0+100s to a power-law decay with index 2.7 (+0.3, -0.2). The later PC mode data lie orders of magnitude above the extrapolation of this decay; the addition of a break around T0+1 ks to a decay with power-law index 0.56 (+0.12, -0.06) produces a good fit to the data. Due to the large observing gap the behaviour of the light curve in the interval T0+255 s to T0+35 ks is unknown; if it is more complex than the simple behaviour we have modelled the final decay index could differ significantly from the 0.56 (+0.12, -0.06) value we obtained. A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.0 (+1.0, -0.7). The best-fitting absorption column is 1.20 (+2.36, -0.77) x 10^21 cm^-2, consistent with the Galactic value of 4.2 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 3.8 x 10^-11 (5.0 x 10^-11) erg cm^-2 count^-1. If the light curve continues to decay with a power-law decay index of 0.56, the count rate at T+48 hours will be 5.9 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.2 x 10^-13 (2.9 x 10^-13) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00350853. This circular is an official product of the Swift-XRT team.
GCN 9308 table
GRB_name GRB090429A
GCN_number 9308
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 9308 SUBJECT: GRB 090429A: Swift/UVOT Upper Limits DATE: 09/04/30 15:15:24 GMT FROM: Stephen Holland at USRA/NASA/GSFC/SSC M. M. Chester (PSU), S. T. Holland (CRESST/GSFC/USRA) and C. B. Markwardt (CRESST/GSFC/UMD) report on the behalf of the Swift UVOT team: The Swift/UVOT observed the field of GRB 090429A starting 49 s after the BAT trigger (Markwardt, et al., 2009, GCN Circ. 9280). Settled exposures started at T+67 s. We do not find any new source, relative to the DSS, USNO-B1.0, or 2MASS at the position of the XRT afterglow (Evans, et al. 2009, GCN Circ. 9297). Preliminary 3-sigma upper limits for detecting a source in the white finding chart and the co-added images, using a 2.5 arcsecond radius circular aperture, are Filter T_start T_stop Exp(s) Mag ---------------------------------------------- white (fc) 67 217 147 >21.7 v 35,736 58,902 114 >19.8 b 40,727 63,010 1697 >22.1 u 52,833 53,121 284 >21.0 uvw1 50,447 86,297 3336 >22.2 uvm2 44,777 47,341 659 >20.9 uvw2 34,829 57,197 1746 >21.9 white 63,015 63,137 120 >21.5 ---------------------------------------------- The quoted upper limits have not been corrected for the expected Galactic extinction along the line of sight corresponding to a reddening of E_{B-V} = 0.06 mag (Schlegel, et al., 1998, ApJS, 500, 525). All photometry is on the UVOT photometry system described in Poole et al. (2008, MNRAS, 383, 627).
GCN 9318 table
GRB_name GRB090429A
GCN_number 9318
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 9318 SUBJECT: GRB 090429A: ROVOR magnitude limit DATE: 09/05/01 15:46:47 GMT FROM: J. Ward Moody at BYU Richard L. Pearson and J. Ward Moody report for Brigham Young Univerisitys ROVOR team: We observed the field around GRB 090429A (Swift trigger 350853, Markwardt et al., GCN 9280) with the ROVOR (Robotic Observatory for Variable Object Research) 16 telescope from Delta, Utah. Beginning 30 April 2009 at 03:46:50 UT (22.3 hours after outburst), observations were obtained for a complete integration time of 50 minutes in white light. No detection was made after stacking the images. Using the magnitude limits established by Olivares et al., GCN Circ. 9303 on the 2.2m ESO/MPI telescope at La Silla Observatory, we estimate a magnitude limit of 22 1 mag on these observations.