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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"

26325 results found.

  1. GRB 060707: Refined analysis of the Swift-BAT burst
  2. GRB 060707: BOOTES-IR optical observation
  3. GRB 060515: Upper Limit on Host Galaxy
  4. GRB 060614: SMARTS host galaxy observations
  5. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  6. GRB 060109: Upper Limit on Host Galaxy
  7. GRB 060105: Upper limit on Host Galaxy
  8. GRB 060614: Redshift
  9. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  10. GRB050326: Host Galaxy Candidates
  11. GRB050124: Possible Host Galaxy
  12. GRB050223: Host Galaxy
  13. Konus-Wind observation of GRB 060614
  14. GRB060605: optical observation
  15. GRB 060614: optical observations
  16. GRB 060605, optical observations
  17. GRB 060614: Swift-BAT refined analysis
  18. GRB 060614: Swift/UVOT Observations
  19. GRB060614: Swift-XRT refined analysis
  20. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  21. GRB 060602A: Swift/XRT analysis
  22. BAT Trigger #214277 is SGR 1900+14
  23. GRB 060610: KAIT observations
  24. GRB 060607: RTT150 optical observations
  25. GRB 060607B: Swift-BAT Refined Analysis
  26. GRB060602A: Swift/UVOT upper limits
  27. GRB 060607B: Swift detection of a burst
  28. GCN 060607: Swift-UVOT obswervations.
  29. GRB 060607: Swift-BAT Refined Analysis
  30. GRB 060607: Swift-XRT Team refined analysis
  31. GRB 060607: IR observations
  32. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  33. GRB 060605: RTT150 optical observations
  34. GRB 060607: REM NIR afterglow
  35. GRB 060607: Swift detection of a burst with bright optical counterpart
  36. GRB 060522: PROMPT Optical Limits
  37. GRB 060605 BAT refined analysis
  38. GRB 060605: Xinglong TNT optical observations
  39. GRB060602B : REM infrared observations
  40. GRB060605: Swift/UVOT detections
  41. GRB 060605: Swift-XRT Team refined analysis
  42. GRB 060605: RTT150 optical observations
  43. GRB 060605: Swift detection of a burst with optical counterpart
  44. GRB060604: Swift/UVOT detections
  45. GRB 060604: Swift-XRT Team refined analysis
  46. GRB 060604: BAT refined analysis
  47. GRB 060604A: ROTSE-III Optical Limits
  48. GRB 060604: Swift detection of a burst with possible optical counterpart
  49. GRB 060602A: Swift-BAT Refined Analysis: Correction
  50. GRB 060602B: Swift-XRT Refined Analysis
  51. GRB 060602B: Swift-BAT Refined Analysis
  52. GRB 060602B: Swift/UVOT observations
  53. GRB 060602A: Swift-BAT Refined Analysis
  54. GRB 060211A : WIDGET simultaneous optical observations
  55. GRB060602A: optical observations(/transient?)
  56. GRB 060602B: Swift detection of a burst
  57. GRB060602B: BOOTES-IR candidate afterglow
  58. GRB060602 - SDSS Pre-Burst Observations
  59. GRB 060502A: Optical afterglow observations
  60. GRB 060526: Break in X-ray light curve
  61. GRB060526, optical observations
  62. GRB 051227 : WIDGET simultaneous optical observations
  63. GRB 051028 : WIDGET pre-trigger limit
  64. GRB060526: Optical counterpart from MIRO
  65. GRB 060526: RTT150 optical observations
  66. GRB060526: optical observations
  67. GRB 060526: REM observations
  68. GRB 060526: RTT150 optical observations, afterglow flattening
  69. GRB 060526: MDM-2.4m Observations
  70. GRB 060526: Refined analysis of the Swift-BAT burst
  71. GRB 060526: RTT150 optical observations
  72. GRB060526, optical observations
  73. GRB 060526: Swift/XRT Team refined analysis
  74. GRB 060526: ROTSE-III Observations of Optical Counterpart
  75. GRB 060526: Watcher Observations
  76. GRB060526 - SDSS Pre-burst Observations
  77. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  78. GRB 060413 : WIDGET simultaneous optical observations
  79. XMM-Newton observation of GRB060510b
  80. GRB060512: Late-Time P200 Observations
  81. GRB 060522: Swift-BAT Refined Analysis
  82. GRB 060522: REM NIR observations
  83. GRB 060522: TNG optical observations
  84. GRB 060515: NIR observation
  85. GRB 060210: Jet Break in the XRT light curve
  86. GRB 060516: Refined analysis of the Swift-BAT burst
  87. GRB060515: P200 NIR Observations
  88. GRB 060505 BAT refined analysis
  89. GRB 060515 BAT refined analysis
  90. GRB 060512: TAROT optical observation
  91. GRB 060515: Swift/XRT Team refined analysis
  92. GRB 060515: Swift/UVOT Upper Limits
  93. GRB 060515: Swift/XRT position
  94. GRB 060515: Super-LOTIS Observations
  95. GRB 060515: TAROT optical observation
  96. GRB 060512: Subaru NIR observation
  97. GRB060512: Swift XRT Team refined analysis
  98. GRB 060512: 1.54m Kuiper Observations
  99. GRB 060512: Detection of NIR afterglow
  100. GRB 060512: P60 Observations

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