Skip to main content
Circulars over Kafka event name backfill. See news and announcements

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').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

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.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

610 results found.

  1. INTEGRAL ToO observation of SGR0501+4516
  2. SGR 0501+4516: Confirmation of the NIR counterpart
  3. SGR 0501+4516: Detection of possible optical counterpart
  4. SGR 0501+4516: WHT observations of the possible near-infrared counterpart
  5. VLA non-detection of SGR 0501+4516
  6. Radio Detection of SGR 0501+4516: Retraction
  7. SGR 0501+4516: XMM-Newton monitoring schedule
  8. SGR 0501+4516: Decline in Activity
  9. SGR 0501+4516: Proximity to supernova remnant HB9
  10. Enhanced Swift-XRT position of SGR 0501+4516
  11. SGR 0501+4516: GMRT Radio Observation at 618 MHz
  12. SGR 0501+4516: Swift XRT measure of the spin period
  13. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  14. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  15. Suzaku ToO Observation of SGR 0501+4516
  16. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  17. Konus-Wind observations of new SGR 0501+4516
  18. INTEGRAL ToO Observation of SGR0501+4516
  19. Radio Detection of SGR 0501+4516
  20. SGR 0501+4516: MDM Optical Observations
  21. SGR 0501+4516: Astrotel-Caucasus optical observations
  22. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  23. SGR 0501+4516: WSRT Radio Observations
  24. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  25. SGR 0501+4516: optical observations
  26. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  27. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  28. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  29. Third event from SGR 0501+4516
  30. GRB 080822 (SGR 0501+4516): archival optical observations
  31. New Soft Gamma Repeater 0501+4516 was GRB 080822
  32. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  33. Konus-Wind observation of reactivation of SGR 1627-41
  34. Reactivation of SGR 1627-41
  35. Disregard the "GRB 071126" position
  36. GRB 071017: a SHORT GRB detected by INTEGRAL
  37. INTEGRAL ToO observations of SGR1806-20
  38. SGR1806-20: Swift-BAT detection of enhanced activity
  39. Intense burst from SGR 1806-20 detected on September 7
  40. Swift detection of a outburst from SAX J1810.8-2609
  41. AGILE-ACS position for the SGR 1806-20 July 27 burst
  42. Intense burst from SGR 1806-20 detected on July 27
  43. Suzaku ToO observation of SGR 1806-20
  44. INTEGRAL ToO Observation of SGR1806-20
  45. long burst from SGR 1806-20 detected on March 26
  46. GRB 070201: clarification on localization and Konus-Wind spectra
  47. IPN localization of very intense short GRB 070201
  48. Two bright bursts from SGR 1806-20 detected with IBAS
  49. Image of the dust-scattering halo around SGR 1806-20
  50. Second VLA limit on new radio point source in SGR 1806-20
  51. A dust-scattering halo detected around SGR 1806-20
  52. VLA Upper Limit on Outburst of SGR 1806-20
  53. GRB060806 is similar to previous activity of SGR1806-20
  54. BAT Trigger #214277 is SGR 1900+14
  55. SGR 1900+14: Refined analysis of the Swift-BAT outburst
  56. SGR 1900+14: Swift detection of an outburst
  57. SGR 1900+14: BAT observations
  58. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  59. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  60. SGR 1900+14: Swift-BAT detection of a cluster of outbursts
  61. SGR 1900+14: Swift-BAT detection of a bright outburst
  62. SGR 1900+14: CORRECTION to GCN 4923
  63. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  64. SGR 1900+14: Swift detection of renewed activity
  65. GRB 060218: rebrightening
  66. An extraordinary long burst on December 3 from SGR1806-20
  67. Possible resuming of the SGR 1806-20 activity
  68. GRB050925: analysis of the XMM-Newton observation
  69. GRB/SGR 050925: XMM-Newton ToO observation
  70. GRB051103: MASTER: OT limit and host galaxy candidates
  71. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  72. SGR 1806-20: continued moderate activity seen with INTEGRAL
  73. GRB/SGR 050925: IR Observations
  74. GRB050925: Swift-BAT detection of a short burst
  75. GRB 050906: Swift-BAT refined analysis
  76. GRB 050906: Bright galaxy in BAT error box
  77. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  78. Detection of an intermediate burst from SGR 1806-20 on August 8
  79. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  80. Konus-Wind observation of an intermediate burst from SGR 1806-20
  81. Renewal of SGR 1806-20 activity
  82. Ongoing activity of SGR 1806-20 after the giant flare
  83. SGR 1806-20: GMRT results at 240 MHz band.
  84. SGR 1806-20: low frequency GMRT results of 2005 Jan 16.
  85. SGR 1806-20: RXTE/PCA pulse frequency during flare
  86. SGR 1806-20: Further VLA Observations
  87. SGR 1806-20: Further low frequency GMRT results
  88. SGR 1806-20: Further VLA Observations
  89. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  90. Further VLA observations of SGR 1806-20
  91. SGR 1806-20 and extragalactic short-duration GRBs
  92. Further ATCA observations of SGR 1806-20
  93. Fourth Epoch VLA observations of SGR 1806-20
  94. SGR 1806-20: Low frequency GMRT results; submission to GCN circulars
  95. SGR 1806-20: Temporal and Spectral behavior of radio transient
  96. ATCA observations of SGR 1806-20
  97. SGR 1806-20, RHESSI observations of the 041227 giant flare
  98. Third epoch observations of SGR 1806-20 with VLA
  99. Second Epoch VLA observations of SGR 1806-20
  100. Second-epoch VLA observations of SGR 1806-20

Advanced

Download all Circulars as a .tar.gz archive:
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov