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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"

28059 results found.

  1. GRB 071028: Swift-XRT Team refined analysis
  2. GRB 071028, Swift-BAT refined analysis
  3. GRB 071028: Swift detection of a burst
  4. GRB 071003: Infrared Photometry with Keck Adaptive Optics
  5. GRB071021: MARGE Optical Limits
  6. GRB071020, optical upper limit
  7. GRB 071025: SARA VRI upper limits
  8. Swift UVOT upper limits
  9. GRB071025: Xinglong TNT I-band upper limit
  10. GRB 071025: Swift-XRT Team refined analysis
  11. GRB 060602A: host redshift
  12. GRB 071025, Swift-BAT refined analysis
  13. GRB071021 : CFHT Ks-band observation
  14. GRB 071025: ROTSE-III Refined Analysis
  15. GRB 071025a: PAIRITEL observations
  16. GRB 071025: ROTSE-III Detection of Optical Counterpart
  17. GRB 071025: Swift detection of a burst
  18. GRB 071021: R-band detection and analysis
  19. Possible radio detection of GRB 071021 with the VLA
  20. GRB 071021: (Relatively shallow) IR non-detections; motivation for optical spectroscopy
  21. GRB 071020: SARA observations
  22. Radio detection of GRB 071020 with the VLA
  23. GRB071021: MITSuME Okayama Optical Upper Limits
  24. GRB 071021: Z-band detection
  25. GRB 071021: optical and NIR observations
  26. GRB 071021: possible high-z burst
  27. GRB 071021, Swift-BAT refined analysis
  28. GRB071018: 2nd epoch obsevations of Xinglong TNT
  29. GRB 071021: Swift-XRT Team refined analysis
  30. GRB 071021: Xinglong TNT optical Upper Limit
  31. GRB 071021 : Lulin R-band limit
  32. GRB 071021: Swift detection of a burst
  33. GRB071020A: Xinglong TNT Optical afterglow observations
  34. GRB 071020: Swift-XRT refined analysis
  35. GRB 071020, Swift-BAT refined analysis
  36. GRB 071020A: IR Imaging with PAIRITEL
  37. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  38. GRB071020 - SDSS Pre-burst Observations
  39. GRB 071020: Swift detection of a bright burst
  40. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  41. GRB 071018: Mercator Telescope optical observations
  42. Swift autonomous slewing re-enabled
  43. GRB 071018: SARA observations
  44. GRB 071018: Swift-XRT observation
  45. GRB 071017 - Swift XRT observations
  46. GRB 071018: Possible OT from Xinglong TNT observation
  47. GRB 071010B: Light Curve Break Confirmed
  48. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  49. GRB 071018, Swift-BAT refined analysis
  50. GRB 071010B: Suzaku WAM observation of the prompt emission
  51. GRB 071013: 3rd TLS Epoch - constraints on variability
  52. GRB 071013: TLS 2nd epoch - Kornienko candidate constant
  53. GRB 071010B: Optical observations of EST
  54. GRB 071011: MITSuME Optical Observations
  55. GRB 070920A: deep optical observations at the NOT
  56. GRB 071010B: Keck/LRIS Photometry
  57. GRB 071013: TLS Upper Limit
  58. VLA non-detection of GRB 071011
  59. GRB 071013: Optical observations
  60. GRB 071013: optical observations at NOT
  61. GRB 071013, Swift-BAT refined analysis
  62. GRB071010B, BVRcIc field calibration
  63. GRB 20071013: Xinglong TNT optical Upper Limit
  64. GRB 071010C Swift-BAT detection of a burst
  65. GRB 071011: Optical Limit after 13.95hrs
  66. GRB 071010B correction to GCN 6892 optical observations
  67. GRB 071011: Swift-XRT refined analysis
  68. VLA non-detection of GRB 071010A
  69. GRB 071011: NAYUTA Optical Observation, correction to GCN6886
  70. GRB 071011: Confirmation of P60 optical afterglow
  71. GRB 071010B: Optical Detection
  72. GRB 071011: Kanazawa Optical limits
  73. GRB 071011: P60 Optical Afterglow Candidate
  74. GRB 071011: MARGE Optical Limits
  75. GRB 071010B: Super-LOTIS upper limit
  76. GRB 071010B optical photometry
  77. GRB 071011: XRT afterglow detection
  78. GRB 071011, Swift-BAT refined analysis
  79. GRB 071010B: Gemini Spectroscopic Observations
  80. GRB 071011: NAYUTA Optical Observation
  81. GRB 071010A: Continued Keck Imaging
  82. GRB 071010B: Bright OT confirmed with TLS
  83. GRB 071011: Swift detection of a burst
  84. Optical Observation: GRB 071010
  85. Optical observations: GRB 071010A
  86. Konus-Wind observation of GRB 071010B
  87. GRB071010B: Swift/XRT detection
  88. GRB 071010B, Swift-BAT refined analysis
  89. GRB 071010A: bright NIR afterglow
  90. GRB 071006, Swift-BAT refined analysis
  91. GRB 071010A: Keck/LRIS Photometry
  92. GRB 071008, Swift-BAT refined analysis
  93. GRB 071010, Swift-BAT refined analysis
  94. GRB 071010 REM NIR observations
  95. GRB 071010: TAROT La Silla observatory detection of the afterglow
  96. GRB 071008: Swift detection of a burst
  97. GRB 071003: XRT refined analysis
  98. GRB070920A: MAGIC telescope GeV observation
  99. Radio detection of GRB 071003 with the VLA
  100. GRB 070810B: further XRT analysis

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