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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"

28057 results found.

  1. GRB 070508: REM observations
  2. GRB 070508: TAROT La Silla observatory optical observations
  3. GRB 070508: Swift detection of an intense burst with an optical counterpart
  4. GRB070506: Swift/UVOT Observations
  5. GRB070506: Swift XRT refined analysis
  6. GRB 070506, Swift-BAT Refined Analysis
  7. GRB 070506: Swift detection of a burst with optical afterglow
  8. GRB070429B: VLT observations
  9. GRB070429B: position correction
  10. GRB 070309: Swift-XRT afterglow confirmation
  11. VLA observation of GRB 070429B
  12. Swift/UVOT observations of GRB070429B
  13. GRB 070429B, Swift-BAT refined analysis
  14. Swift/UVOT observations of GRB070429A
  15. GRB 070429A, Swift-BAT refined analysis
  16. GRB 070429A: optical and NIR observations
  17. GRB 070429B: Swift XRT refined analysis
  18. GRB 070429B: ROTSE-III Optical Limits
  19. GRB 070429: ROTSE-III Optical Limits
  20. GRB 070429: Swift detection of a burst
  21. GRB 070427, Swift-BAT Refined Analysis
  22. LT monitoring of GRB070412
  23. GRB 070411: Late-time Keck imaging
  24. GRB070419B: Suzaku WAM observation of the prompt emission
  25. GRB 070420, SMARTS optical/IR afterglow observations
  26. GRB 070411, deep LBT photometry
  27. Konus-Wind observation of GRB 070420
  28. GRB 070411: break in the optical light curve
  29. GRB 070420 Swift-BAT Refined Analysis
  30. GRB 070420: optical rebrightening observed at Mt. John
  31. GRB070420: Swift UVOT continuing observations
  32. GRB 070420: Faulkes Telescope South Observations
  33. GRB 070420: TAROT La Silla observatory optical observations
  34. GRB 070420: NIR and optical afterglow confirmed
  35. GRB 070420: Swift detection of a burst with optical afterglow
  36. GRB 070419A: MITSuME Okayama Observations
  37. GRB 070419A: Early Super-LOTIS Observations
  38. GRB 070419B, Swift-BAT refined analysis
  39. GRB 070419A Swift-BAT Refined Analysis
  40. GRB 070419A, Optical observations
  41. GRB070419 - SDSS Pre-Burst Observations
  42. GRB 070419A: SARA observations
  43. GRB 070419A: NAYUTA Optical Observation
  44. GRB 070419B optical afterglow candidate
  45. GRB 070419A: Optical and IR observations with KANATA
  46. GRB 070419B: optical afterglow candidate
  47. GRB070419A, optical observation
  48. Infrared detection of GRB070419A with UKIRT
  49. GRB 070419A: Kiso Optical observation
  50. GRB 070419: P60 Confirmation of Optical Afterglow
  51. GRB 070419B: Swift detection of a burst
  52. GRB 070419A: ROTSE-III Optical Limits
  53. GRB 070419: Swift detection of a burst
  54. GRB 070418: Optical and IR observations with KANATA
  55. Trigger 276045: Swift detection of a possible burst
  56. GRB 070406: Swift XRT refined analysis
  57. GRB070412: UKIRT-WFCAM JHK upper limits
  58. GRB070412: Swift UVOT observations
  59. GRB 070411: Swift/UVOT observations
  60. GRB 070412, Swift-BAT refined analysis
  61. GRB 070412 Liverpool Telescope optical limit
  62. GRB 070412: Optical observations at Crni Vrh
  63. GRB 070412: further NOT observations
  64. GRB 070412: Gemini/GMOS afterglow candidate
  65. GRB 070412: IAC80 optical afterglow candidate
  66. GRB 070412: NOT observations
  67. GRB 070411, Swift-BAT refined analysis
  68. GRB 070412: Swift detection of a burst
  69. GRB 070411: IAC80 optical observations
  70. GRB 070411 : Liverpool Telescope Observations
  71. GRB 070411: Swift detection of a burst with optical afterglow
  72. GRB 070406: Swift XRT team further analysis
  73. Suzaku ToO observation of SGR 1806-20
  74. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  75. GRB 070406, Swift-BAT refined analysis
  76. GRB 070406: Correction to the optical candidate in GCN6253
  77. GRB 070406: Gemini South Imaging and XRT analysis
  78. GRB070406: Swift UVOT observations
  79. GRB 070406: further analysis of NOT images.
  80. Short GRB 070406 - Possible Bright Host Galaxy
  81. GRB 070406: NOT observations
  82. GRB 070406: Optical candidate
  83. GRB 070406: SARA upper limit
  84. GRB 070406: Xinglong TNT optical Upper Limit
  85. GRB 070402: Suzaku WAM observation of the prompt emission
  86. GRB 070328: Suzaku WAM observation of the prompt emission
  87. UVOT observations of GRB070330
  88. GRB 070330, Swift-BAT refined analysis
  89. GRB 070330: TAROT La Silla observatory optical observations
  90. GRB 070330 - Watcher Observations
  91. GRB 070330: Swift detection of a burst
  92. GRB 070328: Swift/UVOT Upper Limits
  93. long burst from SGR 1806-20 detected on March 26
  94. GRB 070328: Swift/XRT Refined Analysis
  95. GRB 070328 : Suzaku ToO follow up starts
  96. GRB 070328, Swift-BAT refined analysis
  97. GRB 070328: Swift detection of a burst
  98. GRB 070311, deep optical photometry
  99. Short-Hard GRB 070209: PROMPT Observations
  100. GRB 070318: absorption-line redshift

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