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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"

26042 results found.

  1. GRB 060714, SMARTS optical/IR afterglow observation
  2. GRB 060714 : Liverpool Telescope Observations
  3. GRB 060714: Swift XRT refined analysis
  4. GRB 060714: OA redshift
  5. GRB 060708: VLT spectroscopy
  6. GRB060708: MARGE low resolution spectrum observations
  7. Swift-BAT trigger 219136 is not a GRB
  8. GRB060707 possible optical confirmation
  9. Swift trigger 219136 is probably not a GRB
  10. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  11. GRB 060605: SkyNet Optical Limits
  12. GRB060712: P60 Observations
  13. GRB 060712: XRT refined analysis
  14. GRB 060712: Swift/UVOT Upper Limits
  15. GRB060526: optical observations
  16. GRB 060712: XRT refined position
  17. GRB 060712: Refined analysis of the Swift-BAT burst
  18. GRB 060712: Swift detection of a burst
  19. GRB 060708: PROMPT Optical Limits
  20. GRB 060707: OA fading and redshift
  21. GRB 060708: Swift-XRT refined analysis
  22. GCN 060708: Swift-UVOT Observations
  23. GRB 060708: Refined analysis of the Swift-BAT burst
  24. GCN 060707: Swift-UVOT observations
  25. GRB 060707: Swift-XRT refined analysis
  26. GRB 060708: Swift detection of a burst with an UVOT countpart
  27. GRB060707 possible optical confirmation
  28. GRB 060707: BOOTES-IR optical afterglow candidate
  29. GRB 060707: Refined analysis of the Swift-BAT burst
  30. GRB 060707: BOOTES-IR optical observation
  31. GRB060614: Possible SN Bump in UVOT U Band Light Curve
  32. GRB 060707: Swift detection of a burst
  33. GRB 060515: Upper Limit on Host Galaxy
  34. GRB 060614: SMARTS host galaxy observations
  35. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  36. GRB 060109: Upper Limit on Host Galaxy
  37. GRB 060105: Upper limit on Host Galaxy
  38. GRB060614: Detection of the host galaxy but no supernova emission
  39. GRB 060614: redshift confirmation
  40. GRB 060614: Redshift
  41. Swift-BAT trigger 215279 is not a GRB
  42. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  43. GRB060614: Optical observations
  44. GRB 060614: spectroscopy
  45. GRB050326: Host Galaxy Candidates
  46. GRB050124: Possible Host Galaxy
  47. GRB050223: Host Galaxy
  48. GRB060512: near IR observations
  49. GRB060526: optical observations
  50. GRB 060614: pseudo-z from spectral parameters of the prompt emission
  51. Konus-Wind observation of GRB 060614
  52. GRB060605: optical observation
  53. The Unusually Long-Lived Afterglow of GRB 060614
  54. GRB 060614: optical observations
  55. GRB 060605, optical observations
  56. GRB 060614, SMARTS optical/IR afterglow observation
  57. GRB060614: SSO 1m observations
  58. GRB060614: Watcher observation
  59. GRB 060614: Swift-BAT refined analysis
  60. GRB 060614: Swift/UVOT Observations
  61. GRB060614: Swift-XRT refined analysis
  62. GRB 060604, optical observations
  63. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  64. GRB 060602A: Swift/XRT analysis
  65. BAT Trigger #214277 is SGR 1900+14
  66. GRB 060610: KAIT observations
  67. GRB 060607: RTT150 optical observations
  68. GRB 070706B: Watcher upper limit
  69. GRB 060607B: Swift-BAT Refined Analysis
  70. GRB060602A: Swift/UVOT upper limits
  71. GRB 060607B: Swift detection of a burst
  72. GCN 060607: Swift-UVOT obswervations.
  73. GRB 060607: Swift-BAT Refined Analysis
  74. GRB 060607: optical limit by "Pi of the Sky"
  75. GRB 060607: Swift-XRT Team refined analysis
  76. GRB 060607: IR observations
  77. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  78. VLT/UVES observations of GRB 060607
  79. GRB 060607: PROMPT Observations
  80. GRB 060605: RTT150 optical observations
  81. GRB 060607: REM NIR afterglow
  82. GRB 060607: Swift detection of a burst with bright optical counterpart
  83. GRB 060522: PROMPT Optical Limits
  84. GRB 060605 BAT refined analysis
  85. GRB060602B : REM infrared observations
  86. GRB060605: Swift/UVOT detections
  87. GRB 060605: Swift-XRT Team refined analysis
  88. SALT spectroscopy of GRB 060605
  89. GRB 060605: TNG optical observations
  90. GRB 060605: RTT150 optical observations
  91. GRB 060605: ROTSE-III Optical Counterpart
  92. GRB 060605: Swift detection of a burst with optical counterpart
  93. GRB 060605: ROTSE-III Detection of Optical Counterpart
  94. GRB060604: Swift/UVOT detections
  95. GRB 060604: redshift
  96. GRB 060512: Keck Redshift
  97. GRB 060604 optical photometry
  98. GRB 060604: Swift-XRT Team refined analysis
  99. GRB 060604: BAT refined analysis
  100. GRB 060604A: ROTSE-III Optical Limits

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