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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"

27956 results found.

  1. GRB 130427A: high energy gamma-ray detection by AGILE
  2. Swift-BAT trigger 554135 is noise
  3. GRB 130427A: Challis Observatory optical observations
  4. GRB 130427A: Continued Skynet/PROMPT Observations
  5. GRB 130427A: Fermi-LAT refined analysis
  6. GRB 130427A: SARA-N detection
  7. GRB 130418A: Bassano Bresciano Observatory lightcurve analisis
  8. GRB 130427A: Improved Swift-XRT analysis
  9. GRB 100728A: GROND host detection and X-shooter redshift
  10. GRB 130427A: Skynet/PROMPT Observations
  11. GRB 130427B: RATIR Optical and NIR Observations
  12. GRB 130427A, Optical Observations
  13. Konus-Wind observation of GRB 130427A
  14. GRB 130427A: Kanata/HOWPol optical imaging polarimetry
  15. GRB 130427A: Swift-XRT refined Analysis
  16. GRB 130427A: SPI-ACS/INTEGRAL observations
  17. GRB 130427A: CARMA 85 GHz detection
  18. GRB 130427A: VLA 5 GHz detection
  19. GRB 130427B: Swift-XRT refined Analysis
  20. GRB 130427A: RAPTOR Bright Counterpart Before Swift Trigger
  21. GRB 130427A: T100 observations
  22. GRB 130427A: optical observations in CrAO
  23. GRB 130427A: Fermi GBM observation
  24. GRB130427A: Swift/UVOT followup observations of an Optical Afterglow
  25. GRB 130427A: Fermi-LAT detection of a burst
  26. GRB 130427A: Swift-BAT refined analysis
  27. GRB 130427B: Swift-BAT refined analysis
  28. GRB 130427A: Zadko observatory - Gingin optical observations
  29. GRB 130427B: Enhanced Swift-XRT position
  30. GRB 130427A: MAXI/GSC detection
  31. GRB 130427B: Faulkes Telescope North afterglow detection
  32. GRB 130427B: Swift detection of a burst with optical counterpart
  33. GRB 130427A: Continued P60 follow-up of an extremely bright optical afterglow
  34. GRB 130427A: PAIRITEL NIR Detections
  35. GRB 130427A: Faulkes Telescope North detection
  36. GRB 130427A: P60 early detection
  37. GRB 130427A: early optical observations
  38. GRB 130427A: P60 early nondetection
  39. GRB 130427A: Swift detection of a very bright burst with a likely bright optical counterpart
  40. Konus-Wind observation of GRB 130425A
  41. IPN Triangulation of GRB 130425A
  42. GRB 130420A: Continued Skynet/GORT Observations/Detections
  43. GRB 130420B: CARMA and VLA radio observations
  44. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  45. GRB 130425A: Fermi GBM detection
  46. GRB 130420A: Continued RATIR Optical and NIR Observations
  47. GRB 130420A: ROTSE-III data analysis
  48. GRB 130420A: Continued RATIR Optical and NIR Observations
  49. GRB 130420A: Early RAPTOR Simultaneous Multi-Color Observations
  50. GRB 130420B: Fermi GBM observation
  51. Swift Trigger 554135 is probably not a GRB or transient
  52. GRB 130420B: RATIR Optical and NIR Observations
  53. GRB 130420B: Swift-XRT refined Analysis
  54. GRB 130420A: Fermi GBM observation
  55. GRB 130420A: ISON-NM optical observations
  56. Skynet/GORT observations of GRB130420A
  57. GRB 130420B: Swift/UVOT Upper Limits
  58. GRB 130420A: Swift/UVOT Detection
  59. GRB 130420A: Swift-XRT refined Analysis
  60. GRB 130420B: Enhanced Swift-XRT position
  61. GRB 130420B, Swift-BAT refined analysis
  62. GRB 130420A, Swift-BAT refined analysis
  63. Konus-Wind observation of GRB 130418A
  64. GRB 130420A: Enhanced Swift-XRT position
  65. GRB 130420B: MASTER-Net optical observations
  66. GRB 130420B: Swift detection of a burst
  67. GRB 130420A: RATIR Optical and NIR Observations
  68. GRB 130420A: PAIRITEL NIR detections
  69. GRB 130420A: ROTSE-III Detection of Optical Counterpart
  70. GRB 130420A: Swift detection of a burst with an optical counterpart
  71. GRB 130420A: Faulkes Telescope North candidate
  72. GRB 130418A: Swift-XRT refined Analysis
  73. Swift Trigger 553930 is not an astrophysical source
  74. GRB 130418A: Submm observations from SMA
  75. GRB 130419A, Swift-BAT refined analysis
  76. GRB 130327B: Swift/XRT source is not the afterglow
  77. GRB 130419B (Swift trigger Trigger 553930): MASTER-Net optical observations
  78. Trigger 553930: Swift detection of a possible flare from HR 5110
  79. GRB 130418A: LOAO Observation
  80. GRB 130418A, Swift-BAT refined analysis
  81. GRB 130419A: Swift detection of a burst
  82. GRB 130418A: RATIR Optical and NIR Observations
  83. GRB 130418A: CARMA 3mm detection
  84. GRB 130418A: GROND detection of the optical-NIR afterglow
  85. GRB130418A: OSN 1.5m fading afterglow detection
  86. GRB 130418A: Swift/UVOT Detection and request for continuing coverage
  87. GRB 130418A: Enhanced Swift-XRT position
  88. GRB 130418A: TAROT Calern and TAROT la Silla observatory optical observations
  89. GRB 130418A: Bassano Bresciano Observatory optical observations
  90. GRB 130418A: Swift detection of a burst with an optical counterpart
  91. GRB 130408a: Skynet Optical Observations
  92. GRB 130408A, Swift-BAT refined analysis
  93. GRB 130408A: Zadko observatory - Gingin optical observations
  94. GRB 130407A: Swift-XRT observations
  95. GRB130408A: Swift/UVOT followup observations
  96. GRB 130408A: Swift-XRT refined Analysis
  97. Konus-Wind observation of GRB 130408A
  98. GRB 130408A: Enhanced Swift-XRT position
  99. GRB 130408A: GROND detection of the afterglow
  100. GRB 130408A: Swift/UVOT Detection of the Optical Afterglow

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