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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"

21769 results found.

  1. GRB 060712: XRT refined position
  2. GRB 060712: Refined analysis of the Swift-BAT burst
  3. GRB 060707: OA fading and redshift
  4. GCN 060708: Swift-UVOT Observations
  5. GCN 060707: Swift-UVOT observations
  6. GRB 060708: Swift detection of a burst with an UVOT countpart
  7. GRB 060707: Refined analysis of the Swift-BAT burst
  8. GRB 060515: Upper Limit on Host Galaxy
  9. GRB 060109: Upper Limit on Host Galaxy
  10. GRB 060105: Upper limit on Host Galaxy
  11. GRB 060614: Redshift
  12. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  13. GRB050326: Host Galaxy Candidates
  14. GRB050124: Possible Host Galaxy
  15. GRB050223: Host Galaxy
  16. Konus-Wind observation of GRB 060614
  17. GRB060605: optical observation
  18. GRB 060605, optical observations
  19. GRB060614: SSO 1m observations
  20. GRB 060614: Swift-BAT refined analysis
  21. GRB 060614: Swift/UVOT Observations
  22. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  23. GRB 060602A: Swift/XRT analysis
  24. GRB 060610: KAIT observations
  25. GRB 060607: RTT150 optical observations
  26. GRB 060607B: Swift-BAT Refined Analysis
  27. GRB060602A: Swift/UVOT upper limits
  28. GRB 060607B: Swift detection of a burst
  29. GCN 060607: Swift-UVOT obswervations.
  30. GRB 060607: Swift-BAT Refined Analysis
  31. GRB 060607: IR observations
  32. VLT/UVES observations of GRB 060607
  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: Xinglong TNT optical observations
  38. GRB060602B : REM infrared observations
  39. GRB060605: Swift/UVOT detections
  40. GRB 060605: Swift-XRT Team refined analysis
  41. GRB 060605: RTT150 optical observations
  42. GRB060604: Swift/UVOT detections
  43. GRB 060604A: ROTSE-III Optical Limits
  44. GRB 060604: Swift detection of a burst with possible optical counterpart
  45. GRB 060602B: Swift/UVOT observations
  46. GRB 060602B: RTT150 optical observations
  47. GRB 060211A : WIDGET simultaneous optical observations
  48. GRB060602A: optical observations(/transient?)
  49. GRB 060602B: Swift detection of a burst
  50. GRB060602 - SDSS Pre-Burst Observations
  51. GRB 060502A: Optical afterglow observations
  52. GRB 060526: Break in X-ray light curve
  53. GRB060526, optical observations
  54. GRB 051227 : WIDGET simultaneous optical observations
  55. GRB 051028 : WIDGET pre-trigger limit
  56. GRB060526: Optical counterpart from MIRO
  57. GRB 060526: RTT150 optical observations
  58. GRB060526: optical observations
  59. GRB 060526: SMARTS optical/IR afterglow observations
  60. GRB 060526: REM observations
  61. GRB 060526: RTT150 optical observations, afterglow flattening
  62. GRB 060526: Refined analysis of the Swift-BAT burst
  63. GRB 060526: RTT150 optical observations
  64. GRB060526, optical observations
  65. GRB 060526: Watcher Observations
  66. GRB060526 - SDSS Pre-burst Observations
  67. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  68. GRB 060413 : WIDGET simultaneous optical observations
  69. XMM-Newton observation of GRB060510b
  70. GRB060512: Late-Time P200 Observations
  71. GRB 060522: Swift-BAT Refined Analysis
  72. GRB 060522: REM NIR observations
  73. GRB 060522: TNG optical observations
  74. GRB 060522: Swift detection of a burst with possible optical afterglow
  75. GRB 060515: NIR observation
  76. GRB060515: P200 NIR Observations
  77. GRB 060515 BAT refined analysis
  78. GRB 060512: TAROT optical observation
  79. GRB 060515: Swift/UVOT Upper Limits
  80. GRB 060515: Swift/XRT position
  81. GRB 060515: Super-LOTIS Observations
  82. GRB 060515: TAROT optical observation
  83. GRB 060515: ROTSE-III Optical Limits
  84. GRB 060515: Swift detection of a burst
  85. GRB 060512: Subaru NIR observation
  86. GRB060512: Swift XRT Team refined analysis
  87. GRB 060512: 1.54m Kuiper Observations
  88. GRB 060512: Detection of NIR afterglow
  89. GRB 060512: P60 Observations
  90. GRB 060512: REM NIR observations
  91. GRB060512 - SDSS Pre-Burst Observations
  92. GRB 060512: Swift detection of a burst with an optical afterglow
  93. GRB 060505: X-ray afterglow - Correction -
  94. GRB 060505: X-ray afterglow
  95. Konus-Wind observation of GRB 060510A
  96. GRB060418: optical observations
  97. GRB060510 - SDSS Pre-Burst Observations
  98. GRB 060510B: Super-LOTIS Observations
  99. GRB 060510B: Swift detection of a burst
  100. GRB 060510: Swift detection of a burst with optical transient

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