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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"

24378 results found.

  1. GRB 090422: Swift-BAT refined analysis
  2. GRB 090422: Liverpool Telescope observations
  3. GRB 090418B: Suzaku WAM observation of the prompt emission
  4. GRB 090418C: Fermi GBM Detection
  5. GRB 090418A: Swift/UVOT Detection of the Neighbouring Galaxy
  6. Swift-BAT trigger 349718 is not a burst
  7. GRB 090417B: Optical observation
  8. GRB 090418B: Faulkes Telescope North observations
  9. Konus-Wind observation of GRB 090418B
  10. GRB 090419: Swift-BAT refined analysis
  11. GRB 090418B: Detection of a bright burst from Swift-BAT slew data
  12. GRB 090418: Swift-BAT refined analysis
  13. GRB 090418: ROTSE-III Confirmation of Optical Counterpart
  14. GRB 090411B: Suzaku WAM observation of the prompt emission
  15. GRB 090411A: Suzaku WAM observation of the prompt emission
  16. GRB 090417B: optical observations
  17. GRB090417B: optical observations
  18. GRB 090417B: Swift-BAT refined analysis
  19. GRB 090417A: Swift-BAT refined analysis
  20. GRB 090417A: Early-type nature of the putative host
  21. GRB 090417: 2MASS galaxy within BAT Localization
  22. GRB 090411B: Fermi GBM detection
  23. GRB 090411A: Fermi GBM detection
  24. GRB 090410: Suzaku WAM observation of the prompt emission
  25. GRB 090410: Swift-BAT refined analysis
  26. Konus-Wind and Konus-RF observations of GRB 090408b
  27. GRB090408 : TAOS optical observations
  28. GRB 090409: Fermi GBM detection
  29. GRB 090408: Xinglong TNT optical Upper Limit
  30. Swift-BAT trigger 348781: almost certainly not a burst
  31. GRB 090408B: MASTER II-Kourovka optical observations
  32. GRB 090408: Swift detection of a burst
  33. GRB 090407: GROND upper limits
  34. GRB 090407: VLT observations
  35. GRB 090407: Swift-XRT refined analysis
  36. GRB 090407: Swift-BAT refined analysis
  37. Konus-Wind and Konus-RF observations of GRB 090406
  38. GRB 090407: ROTSE-III Optical Limits
  39. GRB 090405: Fermi GBM Detection
  40. GRB 090403: Fermi GBM detection
  41. GRB 090404: GROND upper limits
  42. GRB 090404: optical observations at BOOTES-3 and 1.5-m OSN
  43. GRB 090404: Xinglong TNT optical Upper Limit
  44. GRB 090404: Swift-BAT refined analysis
  45. GRB 090401A: Suzaku WAM observation of the prompt emission
  46. GRB 090401B: Suzaku WAM observation of the prompt emission
  47. Konus-Wind observation of GRB 090401B
  48. GRB 090401B: Xinglong TNT optical Upper Limit
  49. GRB090401B, RIMOTS optical upper limits
  50. GRB 090328: Fermi-LAT refined analysis
  51. GRB 090401B: AGILE refined analysis
  52. GRB 090331: Fermi GBM detection
  53. GRB 090401B: Swift-BAT refined analysis
  54. GRB 090328B: MASTER-Irkutsk prompt optical short burst observations
  55. GRB 090401, Swift-BAT refined analysis
  56. GRB 090323: Further TLS detections - a break?
  57. GRB 090324: Suzaku WAM observation of the prompt emission
  58. GRB 090326: Fermi GBM detection
  59. GRB 090328: BOOTES-3 optical observations
  60. GRB 090328: Fermi GBM Spectral Analysis
  61. GRB 090328B: Fermi GBM Detection
  62. GRB 090330: Fermi GBM detection
  63. Konus-Wind observation of GRB 090328
  64. GRB 090328: IPN Triangulation
  65. GRB 090328: Possible Swift/XRT detection
  66. Fermi LAT and GBM detections of GRB090328
  67. GRB 090323: Additional Lick observations
  68. GRB 090323: TLS detection at 5 days, no break
  69. GRB 090327: Fermi GBM detection
  70. GRB 090320B: MASTER-Net prompt optical observations
  71. GRB 090323: Lick observations
  72. GRB 090323: Fermi GBM Spectral Analysis
  73. GRB 090323: Optical observation of xinglong TNT
  74. GRB 090323 TLS detection - still bright
  75. GRB 090323: Swift-XRT refined analysis
  76. Konus-Wind observation of GRB 090323
  77. GRB 090324: SuperAGILE Localization of a Long GRB
  78. GRB 090323: GROND Detection of the Afterglow and Photo-z
  79. GRB 090323: Possible XRT Counterpart
  80. IPN triangulation of GRB090323
  81. GRB 090320C: Fermi GBM Detection
  82. Fermi GBM and LAT detections of GRB 090323
  83. GRB 090320B: Fermi GBM detection.
  84. GRB 090319: Fermi GBM detection
  85. GRB 090320A: Fermi GBM detection
  86. GRB 090315: Suzaku WAM observation of the prompt emission
  87. Konus-Wind observation of GRB 090315
  88. IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
  89. GRB 090313, SMARTS optical/IR observations
  90. Further Swift/UVOT observations of GRB 090313
  91. GRB 090313: detection with CARMA in 3mm band
  92. GRB090305B: MASTER-net prompt optical short burst observations
  93. GRB 090313: Additional Gemini-S photometry
  94. GRB 090313: Zadko Telescope observations
  95. GRB 090313: Gemini-S redshift
  96. GRB 090313: Swift/UVOT upper limits
  97. GRB 090313: Faulkes Telescope North observations
  98. GRB 090313: Swift-BAT refined analysis
  99. GRB 090313: Sustained optical brightness
  100. GRB 090313, GROND observations

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