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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"

42182 results found.

  1. Radio detection of GRB 071020 with the VLA
  2. GRB071010b: optical observation
  3. GRB071021: MITSuME Okayama Optical Upper Limits
  4. GRB 071021: Z-band detection
  5. GRB 071020: Fading slowly?
  6. GRB 071010B: Fading quickly
  7. GRB 071021: optical and NIR observations
  8. GRB 071021: possible high-z burst
  9. GRB 071021, Swift-BAT refined analysis
  10. GRB071018: 2nd epoch obsevations of Xinglong TNT
  11. GRB 071021: retraction of Faulkes Telescope South candidate
  12. GRB 071021: Swift-XRT Team refined analysis
  13. GRB 071021: Xinglong TNT optical Upper Limit
  14. GRB 071021 : Lulin R-band limit
  15. Konus-Wind observation of GRB 071020
  16. GRB 071021: Faulkes Telescope South optical candidate
  17. GRB 071021: Swift detection of a burst
  18. GRB 071010B: Independent Confirmation of Break
  19. GRB071020A: Xinglong TNT Optical afterglow observations
  20. GRB 071020: Swift-XRT refined analysis
  21. GRB 071020, Swift-BAT refined analysis
  22. GRB 071020A: IR Imaging with PAIRITEL
  23. GRB 071020: VLT spectroscopy
  24. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  25. GRB071020 - SDSS Pre-burst Observations
  26. GRB 071020: Swift detection of a bright burst
  27. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  28. GRB 071018: Mercator Telescope optical observations
  29. Swift autonomous slewing re-enabled
  30. GRB071010b: optical observations
  31. GRB 071018: Swift-XRT observation
  32. GRB 071017 - Swift XRT observations
  33. GRB 071018: Possible OT from Xinglong TNT observation
  34. GRB 071010B: Light Curve Break Confirmed
  35. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  36. GRB 071018, Swift-BAT refined analysis
  37. GRB 071018?: Swift detection of a possible burst
  38. GRB 071010B: Suzaku WAM observation of the prompt emission
  39. GRB 071013: 3rd TLS Epoch - constraints on variability
  40. GRB 071013: TNT optical data refined analysis
  41. GRB 071010B: Keck/DEIMOS emission-line redshift
  42. GRB 071017: a SHORT GRB detected by INTEGRAL
  43. GRB 071013: TLS 2nd epoch - Kornienko candidate constant
  44. GRB071013: optical observations
  45. GRB 071010B: Optical observations of EST
  46. GRB 071010B: TLS 3rd Epoch - finally a break??
  47. GRB 071011: MITSuME Optical Observations
  48. GRB 070920A: deep optical observations at the NOT
  49. GRB 071010B: Photometry after 1.6 days
  50. GRB 071010B: Keck/LRIS Photometry
  51. GRB 071010B: TLS 2nd Epoch, refined analysis
  52. GRB 071013: TLS Upper Limit
  53. GRB 071013: Optical observations
  54. GRB 071013: optical observations at NOT
  55. GRB 071013, Swift-BAT refined analysis
  56. GRB071013: optical limit
  57. GRB071010B, BVRcIc field calibration
  58. GRB 20071013: Xinglong TNT optical Upper Limit
  59. GRB 071013: Swift detection of a burst
  60. GRB 071010C Swift-BAT detection of a burst
  61. GRB 071011: Optical Limit after 13.95hrs
  62. GRB 071011: Xinglong TNT Optical afterglow observations
  63. GRB 071010B correction to GCN 6892 optical observations
  64. GRB 071011: Swift-XRT refined analysis
  65. VLA non-detection of GRB 071010A
  66. GRB 071011: NAYUTA Optical Observation, correction to GCN6886
  67. GRB 071011, Optical afterglow
  68. GRB 071011: Confirmation of P60 optical afterglow
  69. GRB 071010B: Optical Detection
  70. GRB 071011: Kanazawa Optical limits
  71. GRB 071011: P60 Optical Afterglow Candidate
  72. GRB 071011: MARGE Optical Limits
  73. GRB 071010B optical photometry
  74. GRB 071011: XRT afterglow detection
  75. GRB 071010B: Keck/LRIS Spectroscopy
  76. GRB 071011, Swift-BAT refined analysis
  77. GRB 071010B: Gemini Spectroscopic Observations
  78. GRB 071011: NAYUTA Optical Observation
  79. GRB 071010A: Continued Keck Imaging
  80. GRB 071010B: Bright OT confirmed with TLS
  81. GRB 071011: Optical afterglow candidate
  82. GRB 071011: Swift detection of a burst
  83. Optical Observation: GRB 071010
  84. Optical observations: GRB 071010A
  85. Konus-Wind observation of GRB 071010B
  86. GRB071010B: Swift/XRT detection
  87. GRB 071010B, Swift-BAT refined analysis
  88. GRB 071010A: bright NIR afterglow
  89. GRB 071006, Swift-BAT refined analysis
  90. GRB071008: optical observations
  91. GRB 071010B possible optical transient
  92. GRB 071010A: Keck/LRIS Photometry
  93. GRB 071010B: Swift detection of a burst
  94. GRB 071010: Swift-XRT observation
  95. GRB 071008, Swift-BAT refined analysis
  96. GRB 071010, Swift-BAT refined analysis
  97. Konus-Wind observation of GRB 071006
  98. GRB071008: Swift-XRT observation
  99. GRB 071010 REM NIR observations
  100. GRB 071010: Keck/LRIS Spectroscopy

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