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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"

27392 results found.

  1. GRB 070520A: Swift UVOT Upper Limits
  2. GRB 070520B: Swift-XRT refined analysis
  3. GRB 070521: TAROT La Silla observatory optical observations
  4. GRB070521 - SDSS Pre-Burst Observations
  5. GRB 070521: Swift detection of a burst
  6. GRB 070520A: MITSuME Akeno optical upper limits
  7. GRB 070520B, Swift-BAT refined analysis
  8. GRB 070520A, Swift-BAT refined analysis
  9. GRB 070520A: Swift-XRT refined analysis
  10. GRB 070518: TNG observations
  11. GRB 070520B: Swift detection of a burst
  12. GRB 070520: Xinglong EST optical Upper Limit
  13. GRB 070520: Swift detection of a burst
  14. VLA observation of GRB 070518
  15. GRB 070518: Swift-XRT refined analysis
  16. GRB070518: UVOT refined analysis
  17. GRB 070518, Swift-BAT refined analysis
  18. GRB 070518: OT confirmed form Xinglong TNT observation
  19. GRB 070518: Swift detection of a burst with optical afterglow
  20. GRB070517: Swift-XRT Refined Analysis
  21. GRB 070517, Swift-BAT refined analysis
  22. GRB 070517: Optical search
  23. GRB 070517: Swift detection of a burst
  24. GRB 070509: objects inside XRT error circle
  25. GRB 070512: IPN localization and Konus spectrum of a bright burst
  26. GRB070419A: optical observations
  27. GRB 070509: Swift/UVOT Upper Limits
  28. Konus-Wind and Konus-A observation of GRB 070508
  29. GRB 070510: Swift detection of a possible burst
  30. GRB070509: Swift-XRT Refined Analysis
  31. GRB 070509, Swift-BAT refined analysis
  32. GRB 070508: Suzaku/WAM observation of the prompt emission
  33. GRB 070509: REM observations
  34. GRB070508: Swift/UVOT Observations
  35. GRB 070508, Swift-BAT refined analysis
  36. GRB 070508: REM observations
  37. GRB 070508: TAROT La Silla observatory optical observations
  38. GRB 070508: Swift detection of an intense burst with an optical counterpart
  39. GRB070506: Swift/UVOT Observations
  40. GRB070506: Swift XRT refined analysis
  41. GRB 070506, Swift-BAT Refined Analysis
  42. GRB 070506: Swift detection of a burst with optical afterglow
  43. GRB070429B: VLT observations
  44. GRB070429B: position correction
  45. GRB 070309: Swift-XRT afterglow confirmation
  46. VLA observation of GRB 070429B
  47. Swift/UVOT observations of GRB070429B
  48. GRB 070429B, Swift-BAT refined analysis
  49. Swift/UVOT observations of GRB070429A
  50. GRB 070429A, Swift-BAT refined analysis
  51. GRB 070429A: optical and NIR observations
  52. GRB 070429B: Swift XRT refined analysis
  53. GRB 070429B: ROTSE-III Optical Limits
  54. GRB 070429: ROTSE-III Optical Limits
  55. GRB 070429: Swift detection of a burst
  56. GRB 070427, Swift-BAT Refined Analysis
  57. LT monitoring of GRB070412
  58. GRB 070411: Late-time Keck imaging
  59. GRB070419B: Suzaku WAM observation of the prompt emission
  60. GRB 070420, SMARTS optical/IR afterglow observations
  61. GRB 070411, deep LBT photometry
  62. Konus-Wind observation of GRB 070420
  63. GRB 070411: break in the optical light curve
  64. GRB 070420 Swift-BAT Refined Analysis
  65. GRB 070420: optical rebrightening observed at Mt. John
  66. GRB070420: Swift UVOT continuing observations
  67. GRB 070420: Faulkes Telescope South Observations
  68. GRB 070420: TAROT La Silla observatory optical observations
  69. GRB 070420: NIR and optical afterglow confirmed
  70. GRB 070420: Swift detection of a burst with optical afterglow
  71. GRB 070419A: MITSuME Okayama Observations
  72. GRB 070419A: Early Super-LOTIS Observations
  73. GRB 070419B, Swift-BAT refined analysis
  74. GRB 070419A Swift-BAT Refined Analysis
  75. GRB 070419A, Optical observations
  76. GRB070419 - SDSS Pre-Burst Observations
  77. GRB 070419A: SARA observations
  78. GRB 070419A: NAYUTA Optical Observation
  79. GRB 070419B optical afterglow candidate
  80. GRB 070419A: Optical and IR observations with KANATA
  81. GRB 070419B: optical afterglow candidate
  82. GRB070419A, optical observation
  83. Infrared detection of GRB070419A with UKIRT
  84. GRB 070419A: Kiso Optical observation
  85. GRB 070419: P60 Confirmation of Optical Afterglow
  86. GRB 070419B: Swift detection of a burst
  87. GRB 070419A: ROTSE-III Optical Limits
  88. GRB 070419: Swift detection of a burst
  89. GRB 070418: Optical and IR observations with KANATA
  90. Trigger 276045: Swift detection of a possible burst
  91. GRB 070406: Swift XRT refined analysis
  92. GRB070412: UKIRT-WFCAM JHK upper limits
  93. GRB070412: Swift UVOT observations
  94. GRB 070411: Swift/UVOT observations
  95. GRB 070412, Swift-BAT refined analysis
  96. GRB 070412 Liverpool Telescope optical limit
  97. GRB 070412: Optical observations at Crni Vrh
  98. GRB 070412: further NOT observations
  99. GRB 070412: Gemini/GMOS afterglow candidate
  100. GRB 070412: IAC80 optical afterglow candidate

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