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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

37674 results found.

  1. GRB 130427A: RATIR Optical and NIR Observations
  2. GRB 130427A: Weihai optical observations
  3. GRB 130427A: iTelescope T11 optical observations
  4. GRB 130427A: Continued P60 follow-up of an extremely bright optical afterglow
  5. GRB 130427A: Gemini-North redshift
  6. GRB 130427A: MITSuME Akeno Optical observation(T0+8000s~)
  7. GRB 130427A: PAIRITEL NIR Detections
  8. GRB 130427A: Faulkes Telescope North detection
  9. GRB 130427A: P60 early detection
  10. GRB 130427A: early optical observations
  11. GRB 130427A: P60 early nondetection
  12. GRB 130427A: Swift detection of a very bright burst with a likely bright optical counterpart
  13. Konus-Wind observation of GRB 130425A
  14. IPN Triangulation of GRB 130425A
  15. GRB 130420A: Continued Skynet/GORT Observations/Detections
  16. GRB 130420B: CARMA and VLA radio observations
  17. GRB 130425A: Fermi GBM detection
  18. GRB 130420A: Continued RATIR Optical and NIR Observations
  19. GRB 130420A: ROTSE-III data analysis
  20. GRB 130420A: Continued RATIR Optical and NIR Observations
  21. GRB 130418A: Continued RATIR Optical and NIR Observations
  22. GRB 130420A: Redshift from 10.4m GTC
  23. GRB 130420A: Early RAPTOR Simultaneous Multi-Color Observations
  24. GRB 130420B: Fermi GBM observation
  25. GRB 130418A: WSRT radio observation
  26. Swift Trigger 554135 is probably not a GRB or transient
  27. GRB 130420B: RATIR Optical and NIR Observations
  28. GRB 130420A: Continued RATIR Optical and NIR Observations
  29. GRB 130420B: Swift-XRT refined Analysis
  30. GRB 130420A: Fermi GBM observation
  31. GRB 130420A: ISON-NM optical observations
  32. Skynet/GORT observations of GRB130420A
  33. GRB 130420B: Weihai optical upper limit
  34. GRB 130420B: Swift/UVOT Upper Limits
  35. GRB 130420A: Swift/UVOT Detection
  36. GRB130420B: GMG optical upper limit
  37. GRB 130420A: Swift-XRT refined Analysis
  38. GRB 130420B: Enhanced Swift-XRT position
  39. GRB 130420B, Swift-BAT refined analysis
  40. GRB 130420A, Swift-BAT refined analysis
  41. GRB 130420A: GMG optical observation
  42. Konus-Wind observation of GRB 130418A
  43. GRB 130420A: Enhanced Swift-XRT position
  44. GRB130420A : Xinglong TNT optical upper limit
  45. GRB 130420B: Faulkes Telescope North observations
  46. GRB 130420A: Weihai Optical Observations
  47. GRB 130420B: MASTER-Net optical observations
  48. GRB 130420B: Swift detection of a burst
  49. GRB 130420A: T21 optical observations
  50. GRB 130420A: RATIR Optical and NIR Observations
  51. GRB 130420A: PAIRITEL NIR detections
  52. GRB 130420A: ROTSE-III Detection of Optical Counterpart
  53. GRB 130420A: Swift detection of a burst with an optical counterpart
  54. GRB 130420A: Faulkes Telescope North candidate
  55. GRB 130418A: Continued RATIR Optical and NIR Observations
  56. GRB 130418A: Swift-XRT refined Analysis
  57. GRB 130418A: SMARTS optical/IR afterglow observations
  58. GRB 130418A: Submm observations from SMA
  59. GRB 130419A, Swift-BAT refined analysis
  60. GRB 130327B: Swift/XRT source is not the afterglow
  61. GRB 130419B (Swift trigger Trigger 553930): MASTER-Net optical observations
  62. GRB 130418A: T21 optical observation
  63. GRB 130418A: T18 and T21 optical observations
  64. GRB 130418A: LOAO Observation
  65. GRB 130418A, Swift-BAT refined analysis
  66. GRB 130419A: Swift detection of a burst
  67. GRB130418A: VLT/X-shooter redshift confirmation
  68. GRB 130418A: REM NIR observations
  69. GRB 130418A: RATIR Optical and NIR Observations
  70. GRB 130418A: CARMA 3mm detection
  71. GRB 130418A: GROND detection of the optical-NIR afterglow
  72. GRB 130418A: Swift/UVOT Detection and request for continuing coverage
  73. GRB 130418A: Enhanced Swift-XRT position
  74. GRB 130418A: TAROT Calern and TAROT la Silla observatory optical observations
  75. GRB 130418A: TNG optical observations
  76. GRB 130418A: Redshift from 10.4m GTC
  77. GRB 130418A: Bassano Bresciano Observatory optical observations
  78. GRB 130418A: 1.23m I-band observations
  79. GRB 130418A: Swift detection of a burst with an optical counterpart
  80. GRB 130408A: Suzaku WAM observation of the prompt emission
  81. GRB 130408a: Skynet Optical Observations
  82. GRB 130408A: SMARTS optical/IR afterglow observations
  83. GRB 130408A, Swift-BAT refined analysis
  84. GRB 130408A: Zadko observatory - Gingin optical observations
  85. GRB 130407A: Swift-XRT observations
  86. GRB130408A: Swift/UVOT followup observations
  87. GRB 130408A: Swift-XRT refined Analysis
  88. Konus-Wind observation of GRB 130408A
  89. GRB 130408A: Enhanced Swift-XRT position
  90. GRB 130408A - Gemini-S/GMOS redshift determination
  91. GRB 130408A - VLT/X-shooter redshift determination
  92. GRB 130408A: GROND detection of the afterglow
  93. GRB 130408A: Swift/UVOT Detection of the Optical Afterglow
  94. GRB 130408A: Liverpool Telescope Optical candidate detection
  95. GRB 130408A: Swift detection of a burst
  96. GRB 130407A Tiled Swift observations
  97. GRB 130407A: MAXI/GSC detection
  98. GRB 130211A: Retraction of afterglow candidate
  99. GRB 130327B: Suzaku WAM observation of the prompt emission
  100. Konus-Wind observation of GRB 130320B

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