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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"

31728 results found.

  1. GRB 071101: BOOTES-2 prompt optical observations
  2. GRB 071101: a nearby galaxy
  3. GRB 071031, Swift-BAT refined analysis
  4. GRB 071031: Swift/UVOT detection of afterglow
  5. GRB 071031: Swift-XRT Team refined analysis
  6. GRB 071020: MITSuME Akeno optical observations
  7. GRB 071031: REM NIR and Optical observation
  8. GRB 071031, SMARTS afterglow observations
  9. GRB 071031: VLT high-resolution spectroscopy
  10. GRB071031: Rapid PROMPT Detections
  11. GRB 071028B Swift-BAT detection of a burst
  12. GRB071025: Optical+NIR observations
  13. GRB 071028: SARA observations of variable source
  14. Swift UVOT upper limits to GRB071028
  15. GRB 071028: Swift-XRT Team refined analysis
  16. GRB 071028, Swift-BAT refined analysis
  17. GRB 071025: Kuiper Telescope Optical Observations
  18. GRB 071003: Infrared Photometry with Keck Adaptive Optics
  19. GRB 071018: Revised BAT position
  20. GRB 071025A: RAPTOR Observations of Complex Early Optical Behavior
  21. GRB071021: MARGE Optical Limits
  22. GRB071020, optical upper limit
  23. GRB 071025: SARA VRI upper limits
  24. GRB 071025 Milagro GeV/TeV Observations
  25. GRB071025: Optical Pre-imaging from Palomar
  26. Swift UVOT upper limits
  27. GRB071025: Xinglong TNT I-band upper limit
  28. GRB 071025: Swift-XRT Team refined analysis
  29. GRB 071025, Swift-BAT refined analysis
  30. GRB 071025: Early Super-LOTIS Observations
  31. GRB 071025: R/I-band update
  32. GRB071021 : CFHT Ks-band observation
  33. GRB 071025: ROTSE-III Refined Analysis
  34. GRB 071025: Swift XRT refined position
  35. GRB 071025a: PAIRITEL observations
  36. GRB071025: REM NIR afterglow
  37. GRB 071025: ROTSE-III Detection of Optical Counterpart
  38. GRB 071021: R-band detection and analysis
  39. GRB 071020: BTA spectroscopy
  40. GRB071021: Optical+NIR observations
  41. Possible radio detection of GRB 071021 with the VLA
  42. Optical observations of GRB 071020
  43. GRB 071021: (Relatively shallow) IR non-detections; motivation for optical spectroscopy
  44. GRB 071020: SARA observations
  45. Radio detection of GRB 071020 with the VLA
  46. GRB071010b: optical observation
  47. GRB 071021: Subaru NIR observation
  48. GRB 071021: Magellan i-band observation
  49. GRB 071021: Z-band detection
  50. GRB 071020: Fading slowly?
  51. GRB 071010B: Fading quickly
  52. GRB 071021: optical and NIR observations
  53. GRB 071021: possible high-z burst
  54. GRB 071021, Swift-BAT refined analysis
  55. GRB071018: 2nd epoch obsevations of Xinglong TNT
  56. GRB 071021: retraction of Faulkes Telescope South candidate
  57. GRB 071021: Swift-XRT Team refined analysis
  58. GRB 071021: Xinglong TNT optical Upper Limit
  59. GRB 071021 : Lulin R-band limit
  60. Konus-Wind observation of GRB 071020
  61. GRB 071021: Faulkes Telescope South optical candidate
  62. GRB 071010B: Independent Confirmation of Break
  63. GRB071020A: Xinglong TNT Optical afterglow observations
  64. GRB 071020: Swift-XRT refined analysis
  65. GRB 071020, Swift-BAT refined analysis
  66. GRB 071020A: IR Imaging with PAIRITEL
  67. GRB 071020: VLT spectroscopy
  68. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  69. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  70. Swift autonomous slewing re-enabled
  71. GRB071010b: optical observations
  72. GRB 071018: SARA observations
  73. GRB 071018: Swift-XRT observation
  74. GRB 071017 - Swift XRT observations
  75. VLA radio observation of GRB 071018
  76. GRB071018: Correction to the GCN 6936
  77. GRB071018: Correction to the GCN 6936
  78. GRB071018: Correction to the GCN 6936
  79. GRB071018: Correction to the title of the GCN 6936
  80. GRB 071018: Possible OT from Xinglong TNT observation
  81. GRB 071010B: Light Curve Break Confirmed
  82. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  83. GRB 071018, Swift-BAT refined analysis
  84. GRB 071010B: Suzaku WAM observation of the prompt emission
  85. GRB 071013: 3rd TLS Epoch - constraints on variability
  86. GRB 071013: TNT optical data refined analysis
  87. GRB 071010B: Keck/DEIMOS emission-line redshift
  88. GRB 071013: TLS 2nd epoch - Kornienko candidate constant
  89. GRB071013: optical observations
  90. GRB 071010B: Optical observations of EST
  91. GRB 071010B: TLS 3rd Epoch - finally a break??
  92. GRB 071011: MITSuME Optical Observations
  93. GRB 070920A: deep optical observations at the NOT
  94. GRB 071010B: Photometry after 1.6 days
  95. GRB 071010B: Keck/LRIS Photometry
  96. GRB 071010B: TLS 2nd Epoch, refined analysis
  97. GRB 071013: TLS Upper Limit
  98. Correction to GCN circular no. # 6915 for GRB 071010B
  99. VLA detection of radio afterglow of GRB 071010B
  100. VLA non-detection of GRB 071011

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