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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"

11503 results found.

  1. GRB 080906: Swift-XRT Refined Analysis
  2. GRB 080906: GROND observations of the optical/NIR afterglow
  3. GRB 080905B: Refined UVOT Analysis
  4. GRB 080905B: VLT redshift
  5. GRB 080905B: Swift detection of a burst with possible optical counterpart
  6. GRB 080905: Swift detection of a probably-short burst
  7. GRB 080903: ROTSE-III Optical Limits
  8. Recent VLA non-detection of SGR 0501+4516
  9. GRB 080830: Fermi Gamma-ray Burst Monitor detection
  10. INTEGRAL ToO observation of SGR0501+4516
  11. SGR 0501+4516: XMM-Newton monitoring schedule
  12. GRB 080828: SuperAGILE GRB Localization
  13. SGR 0501+4516: Decline in Activity
  14. GRB080823: Fermi Gamma-ray Burst Monitor detection
  15. Konus-Wind observation of GRB 080825B
  16. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  17. GRB 080825B: GRB Localization by SuperAGILE
  18. Konus-Wind observations of new SGR 0501+4516
  19. GRB 080822B, Swift-BAT refined analysis
  20. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  21. New Soft Gamma Repeater 0501+4516 was GRB 080822
  22. GRB 080822: Swift detection of a short burst
  23. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  24. GLAST Burst Monitor detection of GRB 080810
  25. GRB 080810: Swift-XRT Team refined analysis
  26. GRB 080810, Swift-BAT refined analysis
  27. GRB 080805: Swift-XRT Refined Analysis
  28. GRB080805 optical limit by "Pi of the Sky"
  29. GRB 080805: Swift detection of a burst
  30. GRB 080804: Swift detection of a burst with optical afterglow
  31. GRB 080804: ROTSE-III Detection of Optical Counterpart
  32. GRB 080802: Swift detection of a probable burst
  33. GRB 080727B: KAIT photometry and an early lightcurve break
  34. Konus-Wind observation of GRB 080727B
  35. GRB 080727A: Swift-XRT refined analysis
  36. GRB 080727B: KAIT observations
  37. GRB 080727B: Swift detection of a bright burst
  38. GRB 080727: Swift detection of a burst
  39. GRB 080726: GRB Localization by SuperAGILE
  40. GRB 080725, Swift-BAT refined analysis
  41. GRB 080723A: optical upper limit
  42. Konus-Wind observation of GRB 080723B
  43. GRB 080723, Swift-BAT refined analysis
  44. GRB 080723B: Detection and Localization by SuperAGILE
  45. GRB 080723B : a long GRB detected with INTEGRAL
  46. GRB 080723: Swift detection of a burst
  47. Konus-Wind observation of GRB 080721
  48. Retraction of Swift Trigger 317393
  49. Trigger 317205: Swift detection of an outburst from XTE J1701-407
  50. Konus-Wind observation of GRB 080714
  51. GRB 080603B: optical observations in CrAO
  52. GRB 080710: Swift-XRT refined analysis
  53. GRB 080710: KAIT OA candidate
  54. GRB 080710: Swift XRT position
  55. GRB 080710: Swift detection of a burst
  56. GRB 080707: Swift XRT refined analysis
  57. GRB 080707: Swift detection of a burst
  58. GRB 080702B Swift-BAT refined analysis
  59. GRB 080702A: MITSuME Akeno optical upper limits
  60. Swift Trigger 315630: Probably not a GRB
  61. GRB 080701A: Early Super-LOTIS Observations
  62. GRB 080701A, Swift-BAT refined analysis
  63. GRB 080625: Gamma Ray Burst Localization by SuperAGILE
  64. GRB 070809: Putative host galaxy and redshift
  65. Konus-Wind observation of GRB 080613B
  66. GRB 080613A: GROND Confirmation of the Afterglow Candidate
  67. GRB 080613 : a long GRB detected with INTEGRAL
  68. GRB 080603b: optical observation
  69. GRB080605: optical observation with the MITSuME-OAO telescope
  70. Konus-Wind observation of GRB 080607
  71. GRB 080607: Swift-XRT refined analysis
  72. Konus-Wind observation of GRB 080605
  73. GRB 080607: Keck/LRIS spectroscopy and redshift
  74. GRB 080605, Swift-BAT refined analysis
  75. GRB 080605, Swift-BAT refined analysis
  76. GRB 080605: MASTER VWF 46 s AT observation
  77. Swift/UVOT observations of GRB080604
  78. Konus-Wind observation of GRB 080603B
  79. GRB 080603B, Swift-BAT refined analysis
  80. GRB 080603A: Swift/UVOT detection of the afterglow
  81. GRB080603B: RTT150 optical observations, break in light curves
  82. GRB 080604: Early Super-LOTIS Observations
  83. GRB080604: confirmation of optical afterglow
  84. GRB 080604: Swift detection of a burst with an optical afterglow
  85. GRB 080516: TAROT La Silla observatory optical observations
  86. GRB 080603B: BOOTES2/TELMA optical observations
  87. GRB 080603: A long GRB detected by INTEGRAL
  88. Konus-Wind observation of GRB 080602
  89. Swift analysis of BAT Slew Survey event (Trigger=009)
  90. Konus-Wind observation of reactivation of SGR 1627-41
  91. GRB 080515: KPNO 4m NIR afterglow detection
  92. GRB 080515: Swift-XRT position and analysis
  93. GRB 080520, GROND observations
  94. GRB 080520: Swift XRT Refined Analysis
  95. GRB 080520: Swift detection of a burst with optical afterglow
  96. Konus-Wind observation of GRB 080514B
  97. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  98. GRB 080517: Swift detection of a burst
  99. GRB 080516: Swift detection of a burst
  100. Konus-Wind observation of GRB 080513

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