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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"

19171 results found.

  1. GRB060614 ATCA Radio Limits
  2. GRB 060714: Swift/UVOT Observations
  3. GRB 060522: VLA observation
  4. GRB 060719: Swift/UVOT Upper Limits
  5. GRB 060719: Refined analysis of the Swift-BAT burst
  6. GRB 060719: XRT refined analysis
  7. GRB 060719: optical limit by Pi-of-the-Sky
  8. GRB060719: FRAM early follow-up limit
  9. GRB 060719: Swift detection of a burst
  10. GRB 060717: Swift XRT refined analysis
  11. GRB 060714: Refined analysis of the Swift-BAT burst
  12. GRB060717: Swift/UVOT upper limits
  13. GRB 060717: Swift XRT refined position
  14. GRB 060717: Swift-BAT refined analysis
  15. GRB 060717: Swift detection of a burst
  16. GRB 060714: Swift XRT refined analysis
  17. GRB060708: MARGE low resolution spectrum observations
  18. Swift-BAT trigger 219136 is not a GRB
  19. GRB060707 possible optical confirmation
  20. Swift trigger 219136 is probably not a GRB
  21. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  22. GRB 060712: XRT refined analysis
  23. GRB 060712: Swift/UVOT Upper Limits
  24. GRB 060712: XRT refined position
  25. GRB 060712: Refined analysis of the Swift-BAT burst
  26. GRB 060712: Swift detection of a burst
  27. GRB 060708: Swift-XRT refined analysis
  28. GCN 060708: Swift-UVOT Observations
  29. GRB 060708: Refined analysis of the Swift-BAT burst
  30. GCN 060707: Swift-UVOT observations
  31. GRB 060707: Swift-XRT refined analysis
  32. GRB 060708: Swift detection of a burst with an UVOT countpart
  33. GRB060707 possible optical confirmation
  34. GRB 060707: BOOTES-IR optical afterglow candidate
  35. GRB 060707: Refined analysis of the Swift-BAT burst
  36. GRB 060707: BOOTES-IR optical observation
  37. GRB060614: Possible SN Bump in UVOT U Band Light Curve
  38. GRB 060707: Swift detection of a burst
  39. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  40. Swift-BAT trigger 215279 is not a GRB
  41. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  42. GRB 060614: pseudo-z from spectral parameters of the prompt emission
  43. Konus-Wind observation of GRB 060614
  44. The Unusually Long-Lived Afterglow of GRB 060614
  45. GRB 060605, optical observations
  46. GRB060614: SSO 1m observations
  47. GRB060614: Watcher observation
  48. GRB 060614: Swift-BAT refined analysis
  49. GRB 060614: Swift/UVOT Observations
  50. GRB060614: Swift-XRT refined analysis
  51. GRB 060604, optical observations
  52. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  53. GRB 060602A: Swift/XRT analysis
  54. BAT Trigger #214277 is SGR 1900+14
  55. GRB 060610: KAIT observations
  56. GRB 060607: RTT150 optical observations
  57. GRB 070706B: Watcher upper limit
  58. GRB 060607B: Swift-BAT Refined Analysis
  59. GRB060602A: Swift/UVOT upper limits
  60. GRB 060607B: Swift detection of a burst
  61. GCN 060607: Swift-UVOT obswervations.
  62. GRB 060607: Swift-BAT Refined Analysis
  63. GRB 060607: optical limit by "Pi of the Sky"
  64. GRB 060607: Swift-XRT Team refined analysis
  65. VLT/UVES observations of GRB 060607
  66. GRB 060605: RTT150 optical observations
  67. GRB 060607: Swift detection of a burst with bright optical counterpart
  68. GRB 060605 BAT refined analysis
  69. GRB060605: Swift/UVOT detections
  70. GRB 060605: Swift-XRT Team refined analysis
  71. GRB 060605: RTT150 optical observations
  72. GRB 060605: ROTSE-III Optical Counterpart
  73. GRB 060605: Swift detection of a burst with optical counterpart
  74. GRB 060605: ROTSE-III Detection of Optical Counterpart
  75. GRB060604: Swift/UVOT detections
  76. GRB 060604: redshift
  77. GRB 060604 optical photometry
  78. GRB 060604: Swift-XRT Team refined analysis
  79. GRB 060604: BAT refined analysis
  80. GRB 060604A: ROTSE-III Optical Limits
  81. GRB 060604: Swift detection of a burst with possible optical counterpart
  82. GRB 060602A: Swift-BAT Refined Analysis: Correction
  83. GRB 060602B: XMM-Newton Survey Source
  84. GRB 060602B: Swift-XRT Refined Analysis
  85. GRB 060602B: Swift-BAT Refined Analysis
  86. GRB 060602B: Swift/UVOT observations
  87. GRB 060602A: Swift-BAT Refined Analysis
  88. GRB 060602B: RTT150 optical observations
  89. GRB 060602B: Swift detection of a burst
  90. GRB060602 - SDSS Pre-Burst Observations
  91. GRB 060602: Swift detection of a burst
  92. GRB 060526: Break in X-ray light curve
  93. GRB 051227 : WIDGET simultaneous optical observations
  94. GRB 060526: Multiple Optical Flares
  95. GRB060502b: optical observations
  96. GRB 060526: Optical Flare
  97. GRB 060526: Refined analysis of the Swift-BAT burst
  98. GRB 060526: RTT150 optical observations
  99. GRB060526: Further Swift-UVOT Observations
  100. GRB 060526: Swift/XRT Team refined analysis

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