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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.

Advanced Search Examples (click to copy):

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

619 results found.

  1. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  2. Trigger 330353: Swift detection of a Galactic short soft burst
  3. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  4. SGR 0501+4516 : P200 i-band observations
  5. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  6. Recent VLA non-detection of SGR 0501+4516
  7. SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
  8. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  9. nIR observations of SGR 0501+4516
  10. INTEGRAL ToO observation of SGR0501+4516
  11. SGR 0501+4516: Confirmation of the NIR counterpart
  12. SGR 0501+4516: Detection of possible optical counterpart
  13. SGR 0501+4516: WHT observations of the possible near-infrared counterpart
  14. VLA non-detection of SGR 0501+4516
  15. Radio Detection of SGR 0501+4516: Retraction
  16. SGR 0501+4516: XMM-Newton monitoring schedule
  17. SGR 0501+4516: Decline in Activity
  18. SGR 0501+4516: Proximity to supernova remnant HB9
  19. Enhanced Swift-XRT position of SGR 0501+4516
  20. SGR 0501+4516: GMRT Radio Observation at 618 MHz
  21. SGR 0501+4516: Swift XRT measure of the spin period
  22. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  23. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  24. Suzaku ToO Observation of SGR 0501+4516
  25. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  26. Konus-Wind observations of new SGR 0501+4516
  27. INTEGRAL ToO Observation of SGR0501+4516
  28. Radio Detection of SGR 0501+4516
  29. SGR 0501+4516: MDM Optical Observations
  30. SGR 0501+4516: Astrotel-Caucasus optical observations
  31. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  32. SGR 0501+4516: WSRT Radio Observations
  33. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  34. SGR 0501+4516: optical observations
  35. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  36. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  37. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  38. Third event from SGR 0501+4516
  39. GRB 080822 (SGR 0501+4516): archival optical observations
  40. New Soft Gamma Repeater 0501+4516 was GRB 080822
  41. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  42. Konus-Wind observation of reactivation of SGR 1627-41
  43. Reactivation of SGR 1627-41
  44. Disregard the "GRB 071126" position
  45. GRB 071017: a SHORT GRB detected by INTEGRAL
  46. INTEGRAL ToO observations of SGR1806-20
  47. SGR1806-20: Swift-BAT detection of enhanced activity
  48. Intense burst from SGR 1806-20 detected on September 7
  49. Swift detection of a outburst from SAX J1810.8-2609
  50. AGILE-ACS position for the SGR 1806-20 July 27 burst
  51. Intense burst from SGR 1806-20 detected on July 27
  52. Suzaku ToO observation of SGR 1806-20
  53. INTEGRAL ToO Observation of SGR1806-20
  54. long burst from SGR 1806-20 detected on March 26
  55. GRB 070201: clarification on localization and Konus-Wind spectra
  56. IPN localization of very intense short GRB 070201
  57. Two bright bursts from SGR 1806-20 detected with IBAS
  58. Image of the dust-scattering halo around SGR 1806-20
  59. Second VLA limit on new radio point source in SGR 1806-20
  60. A dust-scattering halo detected around SGR 1806-20
  61. VLA Upper Limit on Outburst of SGR 1806-20
  62. GRB060806 is similar to previous activity of SGR1806-20
  63. BAT Trigger #214277 is SGR 1900+14
  64. SGR 1900+14: Refined analysis of the Swift-BAT outburst
  65. SGR 1900+14: Swift detection of an outburst
  66. SGR 1900+14: BAT observations
  67. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  68. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  69. SGR 1900+14: Swift-BAT detection of a cluster of outbursts
  70. SGR 1900+14: Swift-BAT detection of a bright outburst
  71. SGR 1900+14: CORRECTION to GCN 4923
  72. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  73. SGR 1900+14: Swift detection of renewed activity
  74. GRB 060218: rebrightening
  75. An extraordinary long burst on December 3 from SGR1806-20
  76. Possible resuming of the SGR 1806-20 activity
  77. GRB050925: analysis of the XMM-Newton observation
  78. GRB/SGR 050925: XMM-Newton ToO observation
  79. GRB051103: MASTER: OT limit and host galaxy candidates
  80. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  81. SGR 1806-20: continued moderate activity seen with INTEGRAL
  82. GRB/SGR 050925: IR Observations
  83. GRB050925: Swift-BAT detection of a short burst
  84. GRB 050906: Swift-BAT refined analysis
  85. GRB 050906: Bright galaxy in BAT error box
  86. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  87. Detection of an intermediate burst from SGR 1806-20 on August 8
  88. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  89. Konus-Wind observation of an intermediate burst from SGR 1806-20
  90. Renewal of SGR 1806-20 activity
  91. Ongoing activity of SGR 1806-20 after the giant flare
  92. SGR 1806-20: GMRT results at 240 MHz band.
  93. SGR 1806-20: low frequency GMRT results of 2005 Jan 16.
  94. SGR 1806-20: RXTE/PCA pulse frequency during flare
  95. SGR 1806-20: Further VLA Observations
  96. SGR 1806-20: Further low frequency GMRT results
  97. SGR 1806-20: Further VLA Observations
  98. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  99. Further VLA observations of SGR 1806-20
  100. SGR 1806-20 and extragalactic short-duration GRBs

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