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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"

26361 results found.

  1. GRB 070508: Suzaku/WAM observation of the prompt emission
  2. GRB 070509: REM observations
  3. GRB070508: Swift/UVOT Observations
  4. GRB 070508, Swift-BAT refined analysis
  5. GRB 070508: REM observations
  6. GRB 070508: TAROT La Silla observatory optical observations
  7. GRB 070508: Swift detection of an intense burst with an optical counterpart
  8. GRB070506: Swift/UVOT Observations
  9. GRB070506: Swift XRT refined analysis
  10. GRB 070506, Swift-BAT Refined Analysis
  11. GRB 070506: Swift detection of a burst with optical afterglow
  12. GRB070429B: VLT observations
  13. GRB070429B: position correction
  14. GRB 070309: Swift-XRT afterglow confirmation
  15. VLA observation of GRB 070429B
  16. Swift/UVOT observations of GRB070429B
  17. GRB 070429B, Swift-BAT refined analysis
  18. Swift/UVOT observations of GRB070429A
  19. GRB 070429A, Swift-BAT refined analysis
  20. GRB 070429A: optical and NIR observations
  21. GRB 070429B: Swift XRT refined analysis
  22. GRB 070429B: ROTSE-III Optical Limits
  23. GRB 070429: ROTSE-III Optical Limits
  24. GRB 070429: Swift detection of a burst
  25. GRB 070427, Swift-BAT Refined Analysis
  26. LT monitoring of GRB070412
  27. GRB 070411: Late-time Keck imaging
  28. GRB070419B: Suzaku WAM observation of the prompt emission
  29. GRB 070420, SMARTS optical/IR afterglow observations
  30. GRB 070411, deep LBT photometry
  31. Konus-Wind observation of GRB 070420
  32. GRB 070411: break in the optical light curve
  33. GRB 070420 Swift-BAT Refined Analysis
  34. GRB 070420: optical rebrightening observed at Mt. John
  35. GRB070420: Swift UVOT continuing observations
  36. GRB 070420: Faulkes Telescope South Observations
  37. GRB 070420: TAROT La Silla observatory optical observations
  38. GRB 070420: NIR and optical afterglow confirmed
  39. GRB 070420: Swift detection of a burst with optical afterglow
  40. GRB 070419A: MITSuME Okayama Observations
  41. GRB 070419A: Early Super-LOTIS Observations
  42. GRB 070419B, Swift-BAT refined analysis
  43. GRB 070419A Swift-BAT Refined Analysis
  44. GRB 070419A, Optical observations
  45. GRB070419 - SDSS Pre-Burst Observations
  46. GRB 070419A: SARA observations
  47. GRB 070419A: NAYUTA Optical Observation
  48. GRB 070419B optical afterglow candidate
  49. GRB 070419A: Optical and IR observations with KANATA
  50. GRB 070419B: optical afterglow candidate
  51. GRB070419A, optical observation
  52. Infrared detection of GRB070419A with UKIRT
  53. GRB 070419A: Kiso Optical observation
  54. GRB 070419: P60 Confirmation of Optical Afterglow
  55. GRB 070419B: Swift detection of a burst
  56. GRB 070419A: ROTSE-III Optical Limits
  57. GRB 070419: Swift detection of a burst
  58. GRB 070418: Optical and IR observations with KANATA
  59. Trigger 276045: Swift detection of a possible burst
  60. GRB 070406: Swift XRT refined analysis
  61. GRB070412: UKIRT-WFCAM JHK upper limits
  62. GRB070412: Swift UVOT observations
  63. GRB 070411: Swift/UVOT observations
  64. GRB 070412, Swift-BAT refined analysis
  65. GRB 070412 Liverpool Telescope optical limit
  66. GRB 070412: Optical observations at Crni Vrh
  67. GRB 070412: further NOT observations
  68. GRB 070412: Gemini/GMOS afterglow candidate
  69. GRB 070412: IAC80 optical afterglow candidate
  70. GRB 070412: NOT observations
  71. GRB 070411, Swift-BAT refined analysis
  72. GRB 070412: Swift detection of a burst
  73. GRB 070411: IAC80 optical observations
  74. GRB 070411 : Liverpool Telescope Observations
  75. GRB 070411: Swift detection of a burst with optical afterglow
  76. GRB 070406: Swift XRT team further analysis
  77. Suzaku ToO observation of SGR 1806-20
  78. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  79. GRB 070406, Swift-BAT refined analysis
  80. GRB 070406: Correction to the optical candidate in GCN6253
  81. GRB 070406: Gemini South Imaging and XRT analysis
  82. GRB070406: Swift UVOT observations
  83. GRB 070406: further analysis of NOT images.
  84. Short GRB 070406 - Possible Bright Host Galaxy
  85. GRB 070406: NOT observations
  86. GRB 070406: Optical candidate
  87. GRB 070406: SARA upper limit
  88. GRB 070406: Xinglong TNT optical Upper Limit
  89. GRB 070402: Suzaku WAM observation of the prompt emission
  90. GRB 070328: Suzaku WAM observation of the prompt emission
  91. UVOT observations of GRB070330
  92. GRB 070330, Swift-BAT refined analysis
  93. GRB 070330: TAROT La Silla observatory optical observations
  94. GRB 070330 - Watcher Observations
  95. GRB 070330: Swift detection of a burst
  96. GRB 070328: Swift/UVOT Upper Limits
  97. long burst from SGR 1806-20 detected on March 26
  98. GRB 070328: Swift/XRT Refined Analysis
  99. GRB 070328 : Suzaku ToO follow up starts
  100. GRB 070328, Swift-BAT refined analysis

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