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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"

27620 results found.

  1. GRB 060109: Upper Limit on Host Galaxy
  2. GRB 060105: Upper limit on Host Galaxy
  3. GRB 060614: Redshift
  4. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  5. GRB050326: Host Galaxy Candidates
  6. GRB050124: Possible Host Galaxy
  7. GRB050223: Host Galaxy
  8. Konus-Wind observation of GRB 060614
  9. GRB060605: optical observation
  10. GRB 060614: optical observations
  11. GRB 060605, optical observations
  12. GRB 060614: Swift-BAT refined analysis
  13. GRB 060614: Swift/UVOT Observations
  14. GRB060614: Swift-XRT refined analysis
  15. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  16. GRB 060602A: Swift/XRT analysis
  17. BAT Trigger #214277 is SGR 1900+14
  18. GRB 060610: KAIT observations
  19. GRB 060607: RTT150 optical observations
  20. GRB 060607B: Swift-BAT Refined Analysis
  21. GRB060602A: Swift/UVOT upper limits
  22. GRB 060607B: Swift detection of a burst
  23. GCN 060607: Swift-UVOT obswervations.
  24. GRB 060607: Swift-BAT Refined Analysis
  25. GRB 060607: Swift-XRT Team refined analysis
  26. GRB 060607: IR observations
  27. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  28. GRB 060605: RTT150 optical observations
  29. GRB 060607: REM NIR afterglow
  30. GRB 060607: Swift detection of a burst with bright optical counterpart
  31. GRB 060522: PROMPT Optical Limits
  32. GRB 060605 BAT refined analysis
  33. GRB 060605: Xinglong TNT optical observations
  34. GRB060602B : REM infrared observations
  35. GRB060605: Swift/UVOT detections
  36. GRB 060605: Swift-XRT Team refined analysis
  37. GRB 060605: RTT150 optical observations
  38. GRB 060605: Swift detection of a burst with optical counterpart
  39. GRB060604: Swift/UVOT detections
  40. GRB 060604: Swift-XRT Team refined analysis
  41. GRB 060604: BAT refined analysis
  42. GRB 060604A: ROTSE-III Optical Limits
  43. GRB 060604: Swift detection of a burst with possible optical counterpart
  44. GRB 060602A: Swift-BAT Refined Analysis: Correction
  45. GRB 060602B: Swift-XRT Refined Analysis
  46. GRB 060602B: Swift-BAT Refined Analysis
  47. GRB 060602B: Swift/UVOT observations
  48. GRB 060602A: Swift-BAT Refined Analysis
  49. GRB 060211A : WIDGET simultaneous optical observations
  50. GRB060602A: optical observations(/transient?)
  51. GRB 060602B: Swift detection of a burst
  52. GRB060602B: BOOTES-IR candidate afterglow
  53. GRB060602 - SDSS Pre-Burst Observations
  54. GRB 060502A: Optical afterglow observations
  55. GRB 060526: Break in X-ray light curve
  56. GRB060526, optical observations
  57. GRB 051227 : WIDGET simultaneous optical observations
  58. GRB 051028 : WIDGET pre-trigger limit
  59. GRB060526: Optical counterpart from MIRO
  60. GRB 060526: RTT150 optical observations
  61. GRB060526: optical observations
  62. GRB 060526: REM observations
  63. GRB 060526: RTT150 optical observations, afterglow flattening
  64. GRB 060526: MDM-2.4m Observations
  65. GRB 060526: Refined analysis of the Swift-BAT burst
  66. GRB 060526: RTT150 optical observations
  67. GRB060526, optical observations
  68. GRB 060526: Swift/XRT Team refined analysis
  69. GRB 060526: ROTSE-III Observations of Optical Counterpart
  70. GRB 060526: Watcher Observations
  71. GRB060526 - SDSS Pre-burst Observations
  72. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  73. GRB 060413 : WIDGET simultaneous optical observations
  74. XMM-Newton observation of GRB060510b
  75. GRB060512: Late-Time P200 Observations
  76. GRB 060522: Swift-BAT Refined Analysis
  77. GRB 060522: REM NIR observations
  78. GRB 060522: TNG optical observations
  79. GRB 060515: NIR observation
  80. GRB 060210: Jet Break in the XRT light curve
  81. GRB 060516: Refined analysis of the Swift-BAT burst
  82. GRB060515: P200 NIR Observations
  83. GRB 060505 BAT refined analysis
  84. GRB 060515 BAT refined analysis
  85. GRB 060512: TAROT optical observation
  86. GRB 060515: Swift/XRT Team refined analysis
  87. GRB 060515: Swift/UVOT Upper Limits
  88. GRB 060515: Swift/XRT position
  89. GRB 060515: Super-LOTIS Observations
  90. GRB 060515: TAROT optical observation
  91. GRB 060512: Subaru NIR observation
  92. GRB060512: Swift XRT Team refined analysis
  93. GRB 060512: 1.54m Kuiper Observations
  94. GRB 060512: Detection of NIR afterglow
  95. GRB 060512: P60 Observations
  96. GRB 060512: Swift-BAT Refined Analysis
  97. GRB 060512: REM NIR observations
  98. GRB060512 - SDSS Pre-Burst Observations
  99. GRB 060512: Swift detection of a burst with an optical afterglow
  100. GRB 060505: X-ray afterglow - Correction -

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