GCN Circulars
GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.
Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
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To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
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To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.
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subject:"Swift"body:"GRB"submitter:"Judith Racusin"675 results found.
- GRB 070201: clarification on localization and Konus-Wind spectra
- IPN localization of very intense short GRB 070201
- Two bright bursts from SGR 1806-20 detected with IBAS
- Image of the dust-scattering halo around SGR 1806-20
- Second VLA limit on new radio point source in SGR 1806-20
- A dust-scattering halo detected around SGR 1806-20
- VLA Upper Limit on Outburst of SGR 1806-20
- GRB060806 is similar to previous activity of SGR1806-20
- BAT Trigger #214277 is SGR 1900+14
- SGR 1900+14: Refined analysis of the Swift-BAT outburst
- SGR 1900+14: Swift detection of an outburst
- SGR 1900+14: BAT observations
- Konus-Wind observation of the recent SGR 1900+14 activity. Will
- SGR 1900+14: bright burst detected by Konus-Wind on March 28
- SGR 1900+14: Swift-BAT detection of a cluster of outbursts
- SGR 1900+14: Swift-BAT detection of a bright outburst
- SGR 1900+14: CORRECTION to GCN 4923
- SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
- SGR 1900+14: Swift detection of renewed activity
- GRB 060322: Swift-BAT detection of a 200-sec burst
- GRB 060218: rebrightening
- An extraordinary long burst on December 3 from SGR1806-20
- Possible resuming of the SGR 1806-20 activity
- GRB050925: analysis of the XMM-Newton observation
- GRB/SGR 050925: XMM-Newton ToO observation
- GRB051103: MASTER: OT limit and host galaxy candidates
- IPN triangulation and Konus spectrum of the bright short/hard GRB051103
- SGR 1806-20: continued moderate activity seen with INTEGRAL
- GRB/SGR 050925: IR Observations
- GRB050925: Swift-BAT detection of a short burst
- GRB 050908: Optical observations
- GRB 050906: Swift-BAT refined analysis
- GRB 050906: Bright galaxy in BAT error box
- Ongoing activity of SGR 1806-20: an intermediate burst 050811
- Detection of an intermediate burst from SGR 1806-20 on August 8
- Konus-Wind observation of GRB 050717
- H11603: An X-ray flare from V4641 Sgr, or a possible XRF
- Konus-Wind observation of an intermediate burst from SGR 1806-20
- Renewal of SGR 1806-20 activity
- Ongoing activity of SGR 1806-20 after the giant flare
- SGR 1806-20: GMRT results at 240 MHz band.
- SGR 1806-20: low frequency GMRT results of 2005 Jan 16.
- SGR 1806-20: RXTE/PCA pulse frequency during flare
- SGR 1806-20: Further VLA Observations
- SGR 1806-20: Further low frequency GMRT results
- SGR 1806-20: Further VLA Observations
- SGR1806: Optical Transient Candidates in SOHO/LASCO Images
- Further VLA observations of SGR 1806-20
- SGR 1806-20 and extragalactic short-duration GRBs
- Further ATCA observations of SGR 1806-20
- Fourth Epoch VLA observations of SGR 1806-20
- SGR 1806-20: Low frequency GMRT results; submission to GCN circulars
- SGR 1806-20: Temporal and Spectral behavior of radio transient
- ATCA observations of SGR 1806-20
- SGR 1806-20, RHESSI observations of the 041227 giant flare
- Third epoch observations of SGR 1806-20 with VLA
- Second Epoch VLA observations of SGR 1806-20
- Second-epoch VLA observations of SGR 1806-20
- SGR1806: Detection of a Sudden Ionospheric Disturbance
- DETECTION OF POLARIZATION OF THE RADIO EMISSION FROM SGR 1806-20
- VLA observations of SGR 1806-20
- SGR1806 VLA Observations
- VLA observations of SGR 1806-20
- SGR1806-20: RXTE-PCA observation of the 041227 super-flare
- Detection of the SGR 1806-20 giant outburst back-scattered by the
- The giant outburst from SGR 1806-20
- Giant flare from SGR 1806-20 detected by INTEGRAL
- GRB041223: Swift XRT Detection of X-ray Afterglow Emission
- Very high activity of SGR 1806-20
- Summary of the recent bursts from SGR 1806-20
- IBAS GRB Alert # 2034
- Bright bursts from SGR1806-20
- Konus-Wind observation of a series SGR 1806-20 bursts on 041005
- Bursts from SGR 1806-20: Preliminary INTEGRAL results
- Very strong outburst from SGR 1806-20 detected with INTEGRAL
- SGR 1806-20 still active
- An intense burst from SGR1806-20
- Very bright burst detected from SGR 1806-20
- Increase of SGR 1806-20 activity
- Bursting activity from SGR 1806-20 detected with IBAS
- Ongoing activity of SGR 1806-20
- GRB040706:observation at University of Miyazaki
- SGR 1806-20: no IR variability of the proposed counterparts
- SGR 1806-20, potential NIR counterpart
- Activivty of SGR 1806-20
- IBAS GRB Alerts n.1785 to 1791
- Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
- IBAS GRB Alert 1694
- IBAS GRB alerts 1679, 1680, 1681
- IBAS results on a burst from SGR1806-20
- IPN triangulation of GRB031108 (large error box)
- IBAS alert 1180 refers to a burst from SGR 1806-20
- Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
- SGR1806-20 bursts on 031008. Helicon detection and small error box.
- SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
- A burst from SGR 1806-20 detected with IBAS
- IPN triangulation of GRB030926 (short/hard; large error box)
- IBAS detection of bursts from SGR 1806-20
- Radio Observations of SGR1806-20
- INTEGRAL ToO OBSERVATIONS OF SGR1806-20: CALL FOR CORRELATED OBSERVATIONS