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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"

45492 results found.

  1. GRB 130427B: Enhanced Swift-XRT position
  2. GRB 130427A: GMG optical observation
  3. GRB 130427A: MITSuME Okayama Optical Observation
  4. GRB 130427A: Optical Observations
  5. GRB 130427A: MAXI/GSC detection
  6. GRB 130427B: Faulkes Telescope North afterglow detection
  7. GRB 130427B: Swift detection of a burst with optical counterpart
  8. GRB 130427A: RATIR Optical and NIR Observations
  9. GRB 130427A: Weihai optical observations
  10. GRB 130427A: Continued P60 follow-up of an extremely bright optical afterglow
  11. GRB 130427A: Gemini-North redshift
  12. GRB 130427A: MITSuME Akeno Optical observation(T0+8000s~)
  13. GRB 130427A: PAIRITEL NIR Detections
  14. GRB 130427A: Faulkes Telescope North detection
  15. GRB 130427A: P60 early detection
  16. GRB 130427A: early optical observations
  17. GRB 130427A: P60 early nondetection
  18. GRB 130427A: Swift detection of a very bright burst with a likely bright optical counterpart
  19. Konus-Wind observation of GRB 130425A
  20. IPN Triangulation of GRB 130425A
  21. GRB 130420A: Continued Skynet/GORT Observations/Detections
  22. GRB 130420B: CARMA and VLA radio observations
  23. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  24. GRB 130425A: Fermi GBM detection
  25. GRB 130420A: Continued RATIR Optical and NIR Observations
  26. GRB 130420A: ROTSE-III data analysis
  27. GRB 130420A: Continued RATIR Optical and NIR Observations
  28. GRB 130418A: Continued RATIR Optical and NIR Observations
  29. GRB 130420A: Redshift from 10.4m GTC
  30. GRB 130420A: Early RAPTOR Simultaneous Multi-Color Observations
  31. GRB 130420B: Fermi GBM observation
  32. GRB 130418A: WSRT radio observation
  33. Swift Trigger 554135 is probably not a GRB or transient
  34. GRB 130420B: RATIR Optical and NIR Observations
  35. GRB 130420A: Continued RATIR Optical and NIR Observations
  36. GRB 130420B: Swift-XRT refined Analysis
  37. GRB 130420A: Fermi GBM observation
  38. GRB 130420A: ISON-NM optical observations
  39. Skynet/GORT observations of GRB130420A
  40. GRB 130420B: Weihai optical upper limit
  41. GRB 130420B: Swift/UVOT Upper Limits
  42. GRB 130420A: Swift/UVOT Detection
  43. GRB130420B: GMG optical upper limit
  44. GRB 130420A: Swift-XRT refined Analysis
  45. GRB 130420B: Enhanced Swift-XRT position
  46. GRB 130420B, Swift-BAT refined analysis
  47. GRB 130420A, Swift-BAT refined analysis
  48. GRB 130420A: GMG optical observation
  49. Konus-Wind observation of GRB 130418A
  50. GRB 130420A: Enhanced Swift-XRT position
  51. GRB130420A : Xinglong TNT optical upper limit
  52. GRB 130420B: Faulkes Telescope North observations
  53. GRB 130420A: Weihai Optical Observations
  54. GRB 130420B: MASTER-Net optical observations
  55. GRB 130420B: Swift detection of a burst
  56. GRB 130420A: RATIR Optical and NIR Observations
  57. GRB 130420A: PAIRITEL NIR detections
  58. GRB 130420A: ROTSE-III Detection of Optical Counterpart
  59. GRB 130420A: Swift detection of a burst with an optical counterpart
  60. GRB 130420A: Faulkes Telescope North candidate
  61. GRB 130418A: Continued RATIR Optical and NIR Observations
  62. GRB 130418A: Swift-XRT refined Analysis
  63. Swift Trigger 553930 is not an astrophysical source
  64. GRB 130418A: SMARTS optical/IR afterglow observations
  65. GRB 130418A: Submm observations from SMA
  66. GRB 130419A, Swift-BAT refined analysis
  67. GRB 130327B: Swift/XRT source is not the afterglow
  68. GRB 130419B (Swift trigger Trigger 553930): MASTER-Net optical observations
  69. Trigger 553930: Swift detection of a possible flare from HR 5110
  70. GRB 130418A: LOAO Observation
  71. GRB 130418A, Swift-BAT refined analysis
  72. GRB 130419A: Swift detection of a burst
  73. GRB130418A: VLT/X-shooter redshift confirmation
  74. GRB 130418A: REM NIR observations
  75. GRB 130418A: RATIR Optical and NIR Observations
  76. GRB 130418A: CARMA 3mm detection
  77. GRB 130418A: GROND detection of the optical-NIR afterglow
  78. GRB130418A: OSN 1.5m fading afterglow detection
  79. GRB 130418A: Swift/UVOT Detection and request for continuing coverage
  80. GRB 130418A: Enhanced Swift-XRT position
  81. GRB 130418A: TAROT Calern and TAROT la Silla observatory optical observations
  82. GRB 130418A: TNG optical observations
  83. GRB 130418A: Redshift from 10.4m GTC
  84. GRB 130418A: Bassano Bresciano Observatory optical observations
  85. GRB 130418A: 1.23m I-band observations
  86. GRB 130418A: Swift detection of a burst with an optical counterpart
  87. GRB 130408A: Suzaku WAM observation of the prompt emission
  88. GRB 130408a: Skynet Optical Observations
  89. GRB 130408A: SMARTS optical/IR afterglow observations
  90. GRB 130408A, Swift-BAT refined analysis
  91. GRB 130408A: Zadko observatory - Gingin optical observations
  92. GRB 130407A: Swift-XRT observations
  93. GRB130408A: Swift/UVOT followup observations
  94. GRB 130408A: Swift-XRT refined Analysis
  95. Konus-Wind observation of GRB 130408A
  96. GRB 130408A: Enhanced Swift-XRT position
  97. GRB 130408A - Gemini-S/GMOS redshift determination
  98. GRB 130408A - VLT/X-shooter redshift determination
  99. GRB 130408A: GROND detection of the afterglow
  100. GRB 130408A: Swift/UVOT Detection of the Optical Afterglow

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