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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"

35438 results found.

  1. GRB 080905B: Swift-XRT Refined Analysis
  2. GRB 080905B: Refined UVOT Analysis
  3. GRB 080905B: VLT redshift
  4. GRB 080905A: NOT and VLT observations
  5. GRB 080905B: Enhanced Swift-XRT position
  6. GRB 080905B, Swift-BAT refined analysis
  7. GRB 080905A, Swift-BAT refined analysis
  8. GRB 080906: Swift detection of a burst with optical afterglow
  9. GRB 080905A: Swift-XRT Refined Analysis
  10. GRB 080825C: Fermi GBM Spectral Analysis
  11. GRB 080905B: Swift detection of a burst with possible optical counterpart
  12. GRB 080905: R & I-band optical observations
  13. GRB 080905: Swift detection of a probably-short burst
  14. GRB 080903: Swift/UVOT Observations
  15. GRB 080903: Swift-XRT Refined Analysis
  16. GRB 080903: Enhanced Swift-XRT position
  17. GRB 080903, Swift-BAT refined analysis
  18. GRB 080903: optical observations
  19. GRB 080903: Liverpool Telescope observations
  20. GRB 080903: Astrotel-Caucasus optical observations
  21. GRB 080903: Optical afterglow candidate
  22. GRB 080903: TAROT Calern observatory optical observations
  23. GRB 080903: ROTSE-III Optical Limits
  24. GRB 080903: Swift detection of a burst
  25. GRB 080830: Fermi Gamma-ray Burst Monitor detection
  26. GRB080828: Swift/UVOT Upper Limits
  27. GRB080825B: Swift/UVOT Upper Limits
  28. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  29. Swift-BAT trigger 322590 is not a GRB
  30. Swift trigger 322590: BAT detection of a possible burst
  31. GRB 080828: SuperAGILE GRB Localization
  32. GRB080823: Fermi Gamma-ray Burst Monitor detection
  33. GRB 080824: Fermi Gamma Ray Burst Monitor detection
  34. GRB 080825B: pseudo-z= 0.83 from prompt emission spectrum
  35. Konus-Wind observation of GRB 080825B
  36. GRB080825C: GLAST Burst Monitor detection
  37. GRB 080825B: Swift-XRT team analysis
  38. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  39. GRB080825: Afterglow confirmation and redshift estimate
  40. GRB 080825B - optical counterpart candidate
  41. GRB 080825B: GRB Localization by SuperAGILE
  42. GRB 080822B, Swift-BAT refined analysis
  43. GRB 080822B: MASTER optical observation
  44. New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
  45. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  46. GRB 080822B: Swift detection of a burst
  47. GRB080818B: GLAST Burst Monitor detection
  48. GRB 080822 (SGR 0501+4516): archival optical observations
  49. New Soft Gamma Repeater 0501+4516 was GRB 080822
  50. GRB 080822: Swift detection of a short burst
  51. GLAST Burst Monitor detection of a GRB: 080816B
  52. GLAST Burst Monitor detection of GRB 080818
  53. GLAST Burst Monitor detection of GRB080817B
  54. GLAST Burst Monitor detection of GRB 080817
  55. GLAST Burst Monitor detection of GRB080816
  56. GRB080810 - optical observations
  57. GRB080810: optical observations
  58. GLAST Burst Monitor detection of GRB 080812
  59. Radio detection of GRB 080810 with the VLA
  60. GRB 080810: RTT150 optical observations
  61. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  62. GLAST Burst Monitor detection of GRB 080810
  63. GRB 080810: Liverpool and Faulkes North observations
  64. GRB 080810: RTT150 optical observations
  65. GRB080810: MITSuME optical observation
  66. First GLAST Burst Monitor GRB Circulars
  67. GRB 080810: Swift/UVOT Refined Analysis
  68. GRB 080810: optical observations
  69. GRB 080810: Liverpool Telescope observations
  70. GRB 080810: D50 optical observation
  71. GRB 080810: Kanazawa optical observation
  72. GRB 080810: OSN follow-up
  73. GRB 080810: Observations from NOT
  74. GRB 080810: RTT150 optical observations
  75. GRB 080810: Swift-XRT Team refined analysis
  76. GRB 080810: Enhanced Swift-XRT position
  77. GRB 080810: KANATA optical-NIR observation, update
  78. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  79. GRB 080810: Keck/HIRES Spectroscopy
  80. GRB 080810, Swift-BAT refined analysis
  81. GRB 080810 : optical observation with KANATA
  82. GRB 080810: Swift detection of a burst with a bright optical afterglow
  83. GRB 080723B: GROND upper limits
  84. GRB 080723B: XMM-Newton observation
  85. GRB 080805: VLT redshift update
  86. GRB 080805: Faulkes Telescope South optical observations
  87. GRB 080804: GROND observations
  88. GRB 080727B: Late VLT imaging
  89. GRB 080804: ATCA Radio Observations
  90. GRB 080805: Swift-XRT Refined Analysis
  91. GRB 080805: Swift/UVOT Upper Limits
  92. GRB 080804: Swift-XRT Refined Analysis
  93. GRB 080804: Swift/UVOT Refined Analysis
  94. GRB 080805, Swift-BAT refined analysis
  95. GRB 080804, Swift-BAT refined analysis
  96. GRB 080804: Enhanced Swift-XRT position
  97. GRB080804: Gemini South redshift confirmation
  98. GRB 080804: Faulkes Telescope South observations
  99. GRB080805 optical limit by "Pi of the Sky"
  100. GRB 080805: VLT redshift

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