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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"

26340 results found.

  1. GRB 080906: Refined Swift/UVOT Observations
  2. GRB 080906: Swift-XRT Refined Analysis
  3. GRB 080906, Swift-BAT refined analysis
  4. GRB 080905A: optical afterglow
  5. GRB 080906: GROND observations of the optical/NIR afterglow
  6. GRB 080905B: Refined UVOT Analysis
  7. GRB 080905B: VLT redshift
  8. GRB 080905A: NOT and VLT observations
  9. GRB 080905B: Enhanced Swift-XRT position
  10. GRB 080905B, Swift-BAT refined analysis
  11. GRB 080905A, Swift-BAT refined analysis
  12. GRB 080906: Swift detection of a burst with optical afterglow
  13. GRB 080905A: Swift-XRT Refined Analysis
  14. GRB080825C: Fermi-LAT observations
  15. GRB 080905B: Swift detection of a burst with possible optical counterpart
  16. GRB 080905: Swift detection of a probably-short burst
  17. GRB 080903: Swift/UVOT Observations
  18. GRB 080903: Swift-XRT Refined Analysis
  19. GRB 080903: Enhanced Swift-XRT position
  20. GRB 080903, Swift-BAT refined analysis
  21. GRB 080903: optical observations
  22. GRB 080903: Liverpool Telescope observations
  23. GRB 080903: Optical afterglow candidate
  24. GRB 080903: TAROT Calern observatory optical observations
  25. GRB 080903: Swift detection of a burst
  26. GRB 080830: Fermi Gamma-ray Burst Monitor detection
  27. SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
  28. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  29. nIR observations of SGR 0501+4516
  30. SGR 0501+4516: Confirmation of the NIR counterpart
  31. GRB080828: Swift/UVOT Upper Limits
  32. SGR 0501+4516: Detection of possible optical counterpart
  33. GRB080825B: Swift/UVOT Upper Limits
  34. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  35. VLA non-detection of SGR 0501+4516
  36. Swift trigger 322590: BAT detection of a possible burst
  37. GRB 080828: SuperAGILE GRB Localization
  38. Enhanced Swift-XRT position of SGR 0501+4516
  39. SGR 0501+4516: GMRT Radio Observation at 618 MHz
  40. GRB080823: Fermi Gamma-ray Burst Monitor detection
  41. GRB 080824: Fermi Gamma Ray Burst Monitor detection
  42. Konus-Wind observation of GRB 080825B
  43. GRB080825C: GLAST Burst Monitor detection
  44. GRB 080825B: Swift-XRT team analysis
  45. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  46. Suzaku ToO Observation of SGR 0501+4516
  47. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  48. GRB 080825B: GRB Localization by SuperAGILE
  49. Radio Detection of SGR 0501+4516
  50. GRB 080822B, Swift-BAT refined analysis
  51. SGR 0501+4516: Astrotel-Caucasus optical observations
  52. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  53. New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
  54. SGR 0501+4516: optical observations
  55. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  56. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  57. GRB080818B: GLAST Burst Monitor detection
  58. GRB 080822: Swift detection of a short burst
  59. GLAST Burst Monitor detection of a GRB: 080816B
  60. GLAST Burst Monitor detection of GRB 080818
  61. GLAST Burst Monitor detection of GRB080817B
  62. GLAST Burst Monitor detection of GRB 080817
  63. GLAST Burst Monitor detection of GRB080816
  64. GRB080810 - optical observations
  65. GLAST Burst Monitor detection of GRB 080812
  66. Radio detection of GRB 080810 with the VLA
  67. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  68. GLAST Burst Monitor detection of GRB 080810
  69. First GLAST Burst Monitor GRB Circulars
  70. GRB 080810: Swift/UVOT Refined Analysis
  71. GRB 080810: Liverpool Telescope observations
  72. GRB 080810: Kanazawa optical observation
  73. GRB 080810: OSN follow-up
  74. GRB 080810: Swift-XRT Team refined analysis
  75. GRB 080810: Enhanced Swift-XRT position
  76. GRB 080810: KANATA optical-NIR observation, update
  77. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  78. GRB 080810, Swift-BAT refined analysis
  79. GRB 080810 : optical observation with KANATA
  80. GRB 080810: Swift detection of a burst with a bright optical afterglow
  81. GRB 080723B: GROND upper limits
  82. GRB 080723B: XMM-Newton observation
  83. GRB 080805: Faulkes Telescope South optical observations
  84. GRB 080804: GROND observations
  85. GRB 080727B: Late VLT imaging
  86. GRB 080805: Swift-XRT Refined Analysis
  87. GRB 080805: Swift/UVOT Upper Limits
  88. GRB 080804: Swift-XRT Refined Analysis
  89. GRB 080804: Swift/UVOT Refined Analysis
  90. GRB 080805, Swift-BAT refined analysis
  91. GRB 080804, Swift-BAT refined analysis
  92. GRB 080804: Enhanced Swift-XRT position
  93. GRB 080804: Faulkes Telescope South observations
  94. GRB080805 optical limit by "Pi of the Sky"
  95. GRB 080805: Afterglow confirmation
  96. GRB 080805: GROND detection of possible afterglow
  97. GRB 080805: Swift detection of a burst
  98. GRB 080804: Swift detection of a burst with optical afterglow
  99. GRB 080804: ROTSE-III Detection of Optical Counterpart
  100. GRB 080802: Swift/UVOT Upper Limits

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