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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.

Lucene Examples (click to copy):

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

598 results found.

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

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