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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"

32688 results found.

  1. Possible radio detection of GRB 071021 with the VLA
  2. Optical observations of GRB 071020
  3. GRB 071021: (Relatively shallow) IR non-detections; motivation for optical spectroscopy
  4. GRB 071020: SARA observations
  5. Radio detection of GRB 071020 with the VLA
  6. GRB071010b: optical observation
  7. GRB 071021: Subaru NIR observation
  8. GRB 071021: Magellan i-band observation
  9. GRB 071021: Z-band detection
  10. GRB 071020: Fading slowly?
  11. GRB 071010B: Fading quickly
  12. GRB 071021: optical and NIR observations
  13. GRB 071021: possible high-z burst
  14. GRB 071021, Swift-BAT refined analysis
  15. GRB071018: 2nd epoch obsevations of Xinglong TNT
  16. GRB 071021: retraction of Faulkes Telescope South candidate
  17. GRB 071021: Swift-XRT Team refined analysis
  18. GRB 071021: Xinglong TNT optical Upper Limit
  19. GRB 071021 : Lulin R-band limit
  20. Konus-Wind observation of GRB 071020
  21. GRB 071021: Faulkes Telescope South optical candidate
  22. GRB 071010B: Independent Confirmation of Break
  23. GRB071020A: Xinglong TNT Optical afterglow observations
  24. GRB 071020: Swift-XRT refined analysis
  25. GRB 071020, Swift-BAT refined analysis
  26. GRB 071020A: IR Imaging with PAIRITEL
  27. GRB 071020: VLT spectroscopy
  28. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  29. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  30. Swift autonomous slewing re-enabled
  31. GRB071010b: optical observations
  32. GRB 071018: SARA observations
  33. GRB 071018: Swift-XRT observation
  34. GRB 071017 - Swift XRT observations
  35. VLA radio observation of GRB 071018
  36. GRB071018: Correction to the GCN 6936
  37. GRB071018: Correction to the GCN 6936
  38. GRB071018: Correction to the GCN 6936
  39. GRB071018: Correction to the title of the GCN 6936
  40. GRB 071018: Possible OT from Xinglong TNT observation
  41. GRB 071010B: Light Curve Break Confirmed
  42. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  43. GRB 071018, Swift-BAT refined analysis
  44. GRB 071010B: Suzaku WAM observation of the prompt emission
  45. GRB 071013: 3rd TLS Epoch - constraints on variability
  46. GRB 071013: TNT optical data refined analysis
  47. GRB 071010B: Keck/DEIMOS emission-line redshift
  48. GRB 071013: TLS 2nd epoch - Kornienko candidate constant
  49. GRB071013: optical observations
  50. GRB 071010B: Optical observations of EST
  51. GRB 071010B: TLS 3rd Epoch - finally a break??
  52. GRB 071011: MITSuME Optical Observations
  53. GRB 070920A: deep optical observations at the NOT
  54. GRB 071010B: Photometry after 1.6 days
  55. GRB 071010B: Keck/LRIS Photometry
  56. GRB 071010B: TLS 2nd Epoch, refined analysis
  57. GRB 071013: TLS Upper Limit
  58. Correction to GCN circular no. # 6915 for GRB 071010B
  59. VLA detection of radio afterglow of GRB 071010B
  60. VLA non-detection of GRB 071011
  61. GRB 071013: optical observations at NOT
  62. GRB 071013, Swift-BAT refined analysis
  63. GRB071013: optical limit
  64. GRB 20071013: Xinglong TNT optical Upper Limit
  65. GRB 071011: Optical Limit after 13.95hrs
  66. GRB 071011: Xinglong TNT Optical afterglow observations
  67. GRB 071010B correction to GCN 6892 optical observations
  68. GRB 071011: Swift-XRT refined analysis
  69. VLA non-detection of GRB 071010A
  70. GRB 071011: NAYUTA Optical Observation, correction to GCN6886
  71. GRB 071011, Optical afterglow
  72. GRB 071011: Confirmation of P60 optical afterglow
  73. GRB 071010B: Optical Detection
  74. GRB 071011: Kanazawa Optical limits
  75. GRB 071011: P60 Optical Afterglow Candidate
  76. GRB 071011: MARGE Optical Limits
  77. GRB 071010B: Super-LOTIS upper limit
  78. GRB 071010B optical photometry
  79. GRB 071011: XRT afterglow detection
  80. GRB 071010B: Keck/LRIS Spectroscopy
  81. GRB 071011, Swift-BAT refined analysis
  82. GRB 071010B: Gemini Spectroscopic Observations
  83. GRB 071011: Early Super-LOTIS Observations
  84. GRB 071011: NAYUTA Optical Observation
  85. GRB 071010A: Continued Keck Imaging
  86. GRB 071010B: Bright OT confirmed with TLS
  87. Optical Observation: GRB 071010
  88. Optical observations: GRB 071010A
  89. Konus-Wind observation of GRB 071010B
  90. GRB071010B: Swift/XRT detection
  91. GRB 071010B, Swift-BAT refined analysis
  92. GRB 071010A: bright NIR afterglow
  93. GRB 071006, Swift-BAT refined analysis
  94. GRB071008: optical observations
  95. GRB 071010B possible optical transient
  96. GRB 071010A: Keck/LRIS Photometry
  97. GRB 071010: Swift-XRT observation
  98. GRB 071008, Swift-BAT refined analysis
  99. GRB 071010, Swift-BAT refined analysis
  100. Konus-Wind observation of GRB 071006

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