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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"
  1. Host galaxy of GRB050904: 250 GHz upper limit with MAMBO at the IRAM 30m
  2. GRB 060708: PROMPT Optical Limits
  3. GRB 060707: OA fading and redshift
  4. GRB 060708: Swift-XRT refined analysis
  5. GCN 060708: Swift-UVOT Observations
  6. GRB 060708: Refined analysis of the Swift-BAT burst
  7. GCN 060707: Swift-UVOT observations
  8. GRB 060707: Swift-XRT refined analysis
  9. GRB 060708: Swift detection of a burst with an UVOT countpart
  10. GRB060707 possible optical confirmation
  11. GRB 060707: BOOTES-IR optical afterglow candidate
  12. GRB 060707: Refined analysis of the Swift-BAT burst
  13. GRB 060707: BOOTES-IR optical observation
  14. GRB060614: Possible SN Bump in UVOT U Band Light Curve
  15. GRB 060707: Swift detection of a burst
  16. GRB 060515: Upper Limit on Host Galaxy
  17. GRB 050223: Magellan redshift
  18. GRB 060614: SMARTS host galaxy observations
  19. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  20. Correction to GCN 5278 & GCN 5279 (GRBs 060105 & 060109)
  21. GRB 060109: Upper Limit on Host Galaxy
  22. GRB 060105: Upper limit on Host Galaxy
  23. GRB060614: Detection of the host galaxy but no supernova emission
  24. GRB 060614: redshift confirmation
  25. GRB 060614: Redshift
  26. Swift-BAT trigger 215279 is not a GRB
  27. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  28. GRB060614: Optical observations
  29. GRB 060614: spectroscopy
  30. GRB050326: Host Galaxy Candidates
  31. GRB050124: Possible Host Galaxy
  32. GRB050223: Host Galaxy
  33. GRB060512: near IR observations
  34. GRB060526: optical observations
  35. GRB 060614: pseudo-z from spectral parameters of the prompt emission
  36. Konus-Wind observation of GRB 060614
  37. GRB060605: optical observation
  38. The Unusually Long-Lived Afterglow of GRB 060614
  39. GRB 060614: optical observations
  40. GRB 060605, optical observations
  41. GRB 060614, SMARTS optical/IR afterglow observation
  42. GRB060614: SSO 1m observations
  43. GRB060614: Watcher observation
  44. GRB 060614: Swift-BAT refined analysis
  45. GRB 060614: Swift/UVOT Observations
  46. GRB060614: Swift-XRT refined analysis
  47. GRB 060604, optical observations
  48. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  49. GRB 060602A: Swift/XRT analysis
  50. BAT Trigger #214277 is SGR 1900+14
  51. GRB 060610: KAIT observations
  52. GRB 060607: RTT150 optical observations
  53. GRB 070706B: Watcher upper limit
  54. GRB 060607B: Swift-BAT Refined Analysis
  55. GRB060602A: Swift/UVOT upper limits
  56. GRB 060607B: Swift detection of a burst
  57. GCN 060607: Swift-UVOT obswervations.
  58. GRB 060607: Swift-BAT Refined Analysis
  59. GRB 060607: optical limit by "Pi of the Sky"
  60. GRB 060607: Swift-XRT Team refined analysis
  61. GRB 060607: IR observations
  62. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  63. VLT/UVES observations of GRB 060607
  64. GRB 060607: PROMPT Observations
  65. GRB 060605: RTT150 optical observations
  66. GRB 060607: REM NIR afterglow
  67. GRB 060607: Swift detection of a burst with bright optical counterpart
  68. GRB 060522: PROMPT Optical Limits
  69. GRB 060605 BAT refined analysis
  70. GRB 060605: Xinglong TNT optical observations
  71. GRB060602B : REM infrared observations
  72. GRB060605: Swift/UVOT detections
  73. GRB 060605: Swift-XRT Team refined analysis
  74. SALT spectroscopy of GRB 060605
  75. GRB 060605: TNG optical observations
  76. GRB 060605: RTT150 optical observations
  77. GRB060605: Spectral Observations and Redshift
  78. GRB 060605: ROTSE-III Optical Counterpart
  79. GRB 060605: Swift detection of a burst with optical counterpart
  80. GRB 060605: ROTSE-III Detection of Optical Counterpart
  81. GRB060604: Swift/UVOT detections
  82. GRB 060604: redshift
  83. GRB 060512: Keck Redshift
  84. GRB 060604 optical photometry
  85. GRB 060604: Swift-XRT Team refined analysis
  86. GRB 060604: BAT refined analysis
  87. GRB 060604A: ROTSE-III Optical Limits
  88. GRB 060604: Swift detection of a burst with possible optical counterpart
  89. GRB 060602A: Swift-BAT Refined Analysis: Correction
  90. GRB 060602B: XMM-Newton Survey Source
  91. GRB 060602B: Swift-XRT Refined Analysis
  92. GRB 060602B: Swift-BAT Refined Analysis
  93. GRB 060602B: Swift/UVOT observations
  94. GRB 060602A: Swift-BAT Refined Analysis
  95. GRB 060602B: RTT150 optical observations
  96. GRB 060211A : WIDGET simultaneous optical observations
  97. GRB060602A: optical observations(/transient?)
  98. GRB 060526: Tautenburg Second Epoch Observations
  99. GRB060602A: Bootes-IR observations
  100. GRB 060602B: Swift detection of a burst

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