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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. GRB060714: optical observations
  2. GRB 060717: NOT observations
  3. GRB 060714: Refined analysis of the Swift-BAT burst
  4. GRB 060717 optical upper limit
  5. GRB060717: Swift/UVOT upper limits
  6. GRB 060717: Swift XRT refined position
  7. GRB 060717: Swift-BAT refined analysis
  8. GRB060717 - SDSS Pre-burst Observations
  9. GRB 060714: REM infrared observations
  10. GRB 060717, optical observation
  11. GRB 060717: Swift detection of a burst
  12. GRB060714: correction to GCN 5324
  13. GRB060714: optical observations
  14. GRB 060714, SMARTS optical/IR afterglow observation
  15. GRB 060714 : Liverpool Telescope Observations
  16. GRB 060714: Swift XRT refined analysis
  17. GRB 060714: OA redshift
  18. GRB 060708: VLT spectroscopy
  19. GRB060708: MARGE low resolution spectrum observations
  20. GRB060714: optical observations
  21. Swift-BAT trigger 219136 is not a GRB
  22. Correction to Circular 5314: Circular refers to GRB 060714
  23. GRB060707 possible optical confirmation
  24. Swift trigger 219136 is probably not a GRB
  25. GRB 060714, optical observation
  26. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  27. GRB 060605: SkyNet Optical Limits
  28. GRB060712: P60 Observations
  29. GRB 060712: XRT refined analysis
  30. GRB 060712: Swift/UVOT Upper Limits
  31. GRB060526: optical observations
  32. GRB 060712: XRT refined position
  33. GRB 060712: Refined analysis of the Swift-BAT burst
  34. GRB060712: MASTER optical observation
  35. GRB120706: MASTER optical observation
  36. GRB 060712: Swift detection of a burst
  37. Host galaxy of GRB050904: 250 GHz upper limit with MAMBO at the IRAM 30m
  38. GRB 060708: PROMPT Optical Limits
  39. GRB 060707: OA fading and redshift
  40. GRB 060708: Swift-XRT refined analysis
  41. GCN 060708: Swift-UVOT Observations
  42. GRB 060708: Refined analysis of the Swift-BAT burst
  43. GCN 060707: Swift-UVOT observations
  44. GRB 060707: Swift-XRT refined analysis
  45. GRB 060708: Swift detection of a burst with an UVOT countpart
  46. GRB060707 possible optical confirmation
  47. GRB 060707: BOOTES-IR optical afterglow candidate
  48. GRB 060707: Refined analysis of the Swift-BAT burst
  49. GRB 060707: BOOTES-IR optical observation
  50. GRB060614: Possible SN Bump in UVOT U Band Light Curve
  51. GRB 060707: Swift detection of a burst
  52. GRB 060515: Upper Limit on Host Galaxy
  53. GRB 050223: Magellan redshift
  54. GRB 060614: SMARTS host galaxy observations
  55. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  56. Correction to GCN 5278 & GCN 5279 (GRBs 060105 & 060109)
  57. GRB 060109: Upper Limit on Host Galaxy
  58. GRB 060105: Upper limit on Host Galaxy
  59. GRB060614: Detection of the host galaxy but no supernova emission
  60. GRB 060614: redshift confirmation
  61. GRB 060614: Redshift
  62. Swift-BAT trigger 215279 is not a GRB
  63. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  64. GRB060614: Optical observations
  65. GRB 060614: spectroscopy
  66. GRB050326: Host Galaxy Candidates
  67. GRB050124: Possible Host Galaxy
  68. GRB050223: Host Galaxy
  69. GRB060512: near IR observations
  70. GRB060526: optical observations
  71. GRB 060614: pseudo-z from spectral parameters of the prompt emission
  72. Konus-Wind observation of GRB 060614
  73. GRB060605: optical observation
  74. The Unusually Long-Lived Afterglow of GRB 060614
  75. GRB 060614: optical observations
  76. GRB 060605, optical observations
  77. GRB 060614, SMARTS optical/IR afterglow observation
  78. GRB060614: SSO 1m observations
  79. GRB060614: Watcher observation
  80. GRB 060614: Swift-BAT refined analysis
  81. GRB 060614: Swift/UVOT Observations
  82. GRB060614: Swift-XRT refined analysis
  83. GRB 060604, optical observations
  84. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  85. GRB 060602A: Swift/XRT analysis
  86. BAT Trigger #214277 is SGR 1900+14
  87. GRB 060610: KAIT observations
  88. GRB 060607: RTT150 optical observations
  89. GRB 070706B: Watcher upper limit
  90. GRB 060607B: Swift-BAT Refined Analysis
  91. GRB060602A: Swift/UVOT upper limits
  92. GRB 060607B: Swift detection of a burst
  93. GCN 060607: Swift-UVOT obswervations.
  94. GRB 060607: Swift-BAT Refined Analysis
  95. GRB 060607: optical limit by "Pi of the Sky"
  96. GRB 060607: Swift-XRT Team refined analysis
  97. GRB 060607: IR observations
  98. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  99. VLT/UVES observations of GRB 060607
  100. GRB 060607: PROMPT Observations

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