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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

26119 results found.

  1. GRB070506: Swift XRT refined analysis
  2. GRB 070506, Swift-BAT Refined Analysis
  3. GRB 070506: Swift detection of a burst with optical afterglow
  4. GRB 070412, deep LBT imaging
  5. GRB 070429A: Swift XRT further analysis
  6. GRB070429B: VLT observations
  7. GRB 070429A: optical observations
  8. GRB070429B: position correction
  9. GRB 070309: Swift-XRT afterglow confirmation
  10. GRB070429B: possible host galaxy detection
  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 XRT refined analysis
  16. GRB 070429A, Swift-BAT refined analysis
  17. GRB 070429A: optical and NIR observations
  18. GRB 070429B: Swift XRT refined analysis
  19. GRB 070429B: ROTSE-III Optical Limits
  20. GRB 070429B: Swift detection of a short burst
  21. GRB 070429: ROTSE-III Optical Limits
  22. GRB 070429: Swift detection of a burst
  23. GRB 070427, Swift-BAT Refined Analysis
  24. LT monitoring of GRB070412
  25. GRB 070427: Swift detection of a burst
  26. GRB 070411, further deep LBT photometry
  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. GRB 070420: pseudo-z~1.56 from spectral parameters of the prompt
  32. GRB 070411: break in the optical light curve
  33. GRB 070420 Swift-BAT Refined Analysis
  34. GRB070419A: Kuiper Optical detection
  35. GRB070419a: Swift UVOT observations
  36. GRB 070419A: MARGE Observations
  37. GRB 070420: optical rebrightening observed at Mt. John
  38. GRB 070420: Swift XRT refined analysis
  39. GRB070420: Swift UVOT continuing observations
  40. GRB 070420: Faulkes Telescope South Observations
  41. GBR 070419A: Swift/XRT refined analysis
  42. GRB 070420: TAROT La Silla observatory optical observations
  43. GRB 070420: NIR and optical afterglow confirmed
  44. GRB 070420: Swift detection of a burst with optical afterglow
  45. GRB 070419A: MITSuME Okayama Observations
  46. GRB 070419A: Early Super-LOTIS Observations
  47. GRB 070419B, Swift-BAT refined analysis
  48. GRB 070419A Swift-BAT Refined Analysis
  49. GRB 070419A: RAPTOR Detection of Early Emission
  50. GRB 070419B: Swift XRT refined analysis
  51. GRB 070419: Keck/LRIS Absorption Redshift
  52. GRB 070419B: optical afterglow confirmation
  53. GRB 070419A, Optical observations
  54. GRB 070411: Deep VLT detection
  55. GRB070419 - SDSS Pre-Burst Observations
  56. GRB 070419A: SARA observations
  57. GRB 070419A: NAYUTA Optical Observation
  58. GRB 070419A: Faulkes Telescope North Optical Observations
  59. GRB 070419B optical afterglow candidate
  60. GRB 070419B: optical afterglow candidate
  61. GRB 070419A: Lulin Optical observation
  62. GRB070419A, optical observation
  63. GRB 070419A: Kiso Optical observation
  64. GRB070330: Correction to UVOT position
  65. GRB 070419: P60 Confirmation of Optical Afterglow
  66. GRB 070419B: Swift detection of a burst
  67. GRB 070419 optical afterglow candidate
  68. GRB 070419A: ROTSE-III Optical Limits
  69. GRB 070419: Swift detection of a burst
  70. Swift-BAT Trigger 276045 is a Cosmic Ray Shower event
  71. Trigger 276045: Swift detection of a possible burst
  72. GRB 070406: Swift XRT refined analysis
  73. GRB 070318, SMARTS optical/IR afterglow observations
  74. GRB 070411: TLS data shows plateau, flares
  75. GRB070412: UKIRT-WFCAM JHK upper limits
  76. GRB070412: Swift UVOT observations
  77. GRB 070411: Swift/UVOT observations
  78. GRB 070412, Swift-BAT refined analysis
  79. GRB 070412 Liverpool Telescope optical limit
  80. GRB 070412: Swift-XRT refined analysis
  81. GRB 070411: Swift-XRT refined analysis
  82. GRB 070412: further reanalysis of NOT images
  83. GRB 070412: Optical observations at Crni Vrh
  84. GRB 070411: OA redshift
  85. GRB 070412: Swift-XRT refined position
  86. GRB 070412: further NOT observations
  87. GRB 070412: Gemini/GMOS afterglow candidate
  88. GRB 070412: IAC80 optical afterglow candidate
  89. GRB 070411: Magellan/Clay photometry
  90. GRB 070411: Magellan/IMACS photometry
  91. GRB 070412: NOT observations
  92. GRB 070412: Nearby bright galaxy
  93. GRB 070411, Swift-BAT refined analysis
  94. GRB 070412: Swift detection of a burst
  95. GRB 070411: IAC80 optical observations
  96. GRB 070411: Optical observations at Crni Vrh
  97. GRB 070411: ROTSE-III Detection of Optical Counterpart
  98. GRB 070411: Tautenburg RRM Afterglow Confirmation
  99. GRB 070411: Swift detection of a burst with optical afterglow
  100. GRB 070406: "Star" in XRT error circle S2 is an AGN?

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