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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"

28051 results found.

  1. GRB 070506: Swift detection of a burst with optical afterglow
  2. GRB070429B: VLT observations
  3. GRB070429B: position correction
  4. GRB 070309: Swift-XRT afterglow confirmation
  5. VLA observation of GRB 070429B
  6. Swift/UVOT observations of GRB070429B
  7. GRB 070429B, Swift-BAT refined analysis
  8. Swift/UVOT observations of GRB070429A
  9. GRB 070429A, Swift-BAT refined analysis
  10. GRB 070429A: optical and NIR observations
  11. GRB 070429B: Swift XRT refined analysis
  12. GRB 070429B: ROTSE-III Optical Limits
  13. GRB 070429: ROTSE-III Optical Limits
  14. GRB 070429: Swift detection of a burst
  15. GRB 070427, Swift-BAT Refined Analysis
  16. LT monitoring of GRB070412
  17. GRB 070411: Late-time Keck imaging
  18. GRB070419B: Suzaku WAM observation of the prompt emission
  19. GRB 070420, SMARTS optical/IR afterglow observations
  20. GRB 070411, deep LBT photometry
  21. Konus-Wind observation of GRB 070420
  22. GRB 070411: break in the optical light curve
  23. GRB 070420 Swift-BAT Refined Analysis
  24. GRB 070420: optical rebrightening observed at Mt. John
  25. GRB070420: Swift UVOT continuing observations
  26. GRB 070420: Faulkes Telescope South Observations
  27. GRB 070420: TAROT La Silla observatory optical observations
  28. GRB 070420: NIR and optical afterglow confirmed
  29. GRB 070420: Swift detection of a burst with optical afterglow
  30. GRB 070419A: MITSuME Okayama Observations
  31. GRB 070419A: Early Super-LOTIS Observations
  32. GRB 070419B, Swift-BAT refined analysis
  33. GRB 070419A Swift-BAT Refined Analysis
  34. GRB 070419A, Optical observations
  35. GRB070419 - SDSS Pre-Burst Observations
  36. GRB 070419A: SARA observations
  37. GRB 070419A: NAYUTA Optical Observation
  38. GRB 070419B optical afterglow candidate
  39. GRB 070419A: Optical and IR observations with KANATA
  40. GRB 070419B: optical afterglow candidate
  41. GRB070419A, optical observation
  42. Infrared detection of GRB070419A with UKIRT
  43. GRB 070419A: Kiso Optical observation
  44. GRB 070419: P60 Confirmation of Optical Afterglow
  45. GRB 070419B: Swift detection of a burst
  46. GRB 070419A: ROTSE-III Optical Limits
  47. GRB 070419: Swift detection of a burst
  48. GRB 070418: Optical and IR observations with KANATA
  49. Trigger 276045: Swift detection of a possible burst
  50. GRB 070406: Swift XRT refined analysis
  51. GRB070412: UKIRT-WFCAM JHK upper limits
  52. GRB070412: Swift UVOT observations
  53. GRB 070411: Swift/UVOT observations
  54. GRB 070412, Swift-BAT refined analysis
  55. GRB 070412 Liverpool Telescope optical limit
  56. GRB 070412: Optical observations at Crni Vrh
  57. GRB 070412: further NOT observations
  58. GRB 070412: Gemini/GMOS afterglow candidate
  59. GRB 070412: IAC80 optical afterglow candidate
  60. GRB 070412: NOT observations
  61. GRB 070411, Swift-BAT refined analysis
  62. GRB 070412: Swift detection of a burst
  63. GRB 070411: IAC80 optical observations
  64. GRB 070411 : Liverpool Telescope Observations
  65. GRB 070411: Swift detection of a burst with optical afterglow
  66. GRB 070406: Swift XRT team further analysis
  67. Suzaku ToO observation of SGR 1806-20
  68. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  69. GRB 070406, Swift-BAT refined analysis
  70. GRB 070406: Correction to the optical candidate in GCN6253
  71. GRB 070406: Gemini South Imaging and XRT analysis
  72. GRB070406: Swift UVOT observations
  73. GRB 070406: further analysis of NOT images.
  74. Short GRB 070406 - Possible Bright Host Galaxy
  75. GRB 070406: NOT observations
  76. GRB 070406: Optical candidate
  77. GRB 070406: SARA upper limit
  78. GRB 070406: Xinglong TNT optical Upper Limit
  79. GRB 070402: Suzaku WAM observation of the prompt emission
  80. GRB 070328: Suzaku WAM observation of the prompt emission
  81. UVOT observations of GRB070330
  82. GRB 070330, Swift-BAT refined analysis
  83. GRB 070330: TAROT La Silla observatory optical observations
  84. GRB 070330 - Watcher Observations
  85. GRB 070330: Swift detection of a burst
  86. GRB 070328: Swift/UVOT Upper Limits
  87. long burst from SGR 1806-20 detected on March 26
  88. GRB 070328: Swift/XRT Refined Analysis
  89. GRB 070328 : Suzaku ToO follow up starts
  90. GRB 070328, Swift-BAT refined analysis
  91. GRB 070328: Swift detection of a burst
  92. GRB 070311, deep optical photometry
  93. Short-Hard GRB 070209: PROMPT Observations
  94. GRB 070318: absorption-line redshift
  95. GRB070318: Swift UVOT continuing observations
  96. GRB 070318, Swift-BAT refined analysis
  97. GRB 070318: Swift detection of a burst with an optical afterglow
  98. GRB 070311: Late Central Engine Activity Optical Flare??
  99. VLA observation of GRB 070311
  100. GRB 070311: Optical observation.

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