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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"

27597 results found.

  1. GRB 160412A: Swift detection of a burst
  2. GRB 160408A: CALET Gamma-Ray Burst Monitor detection
  3. GRB 160409A: Swift ToO observations
  4. GRB 160411A: Gemini-S optical observations
  5. GRB 160411A: GROND Optical/NIR upper limits
  6. GRB 160411A: Swift/UVOT Upper Limits
  7. GRB 160411A: Fermi GBM detection
  8. Konus-Wind observation of GRB 160410A (short/hard)
  9. GRB 160410A: TAROT La Silla observatory early optical observations
  10. GRB 160411A: Swift-XRT refined Analysis
  11. GRB 160411A: MASTER-NET early optical observations.
  12. GRB 160410A: Swift-XRT refined Analysis
  13. GRB 160411A: Swift-XRT observations
  14. GRB 160410A: GMG observation
  15. GRB 160411A: Swift detection of a short burst
  16. GRB 160410A: Keck-I/LRIS redshift
  17. GRB 160410A: Skynet PROMPT-CTIO observations of the optical afterglow
  18. GRB 160410A: Swift-BAT refined analysis of the short GRB
  19. GRB 160410A: Swift/UVOT Detection
  20. GRB 160410A: GROND optical detection
  21. GRB 160410A: Swift detection of a (possibly-short) burst with an optical counterpart
  22. GRB 160408A: GMG observation limit
  23. GRB 160408A: TLS Tautenburg observations
  24. GRB 160408A: Swift/UVOT Upper Limits
  25. GRB 160408A: Swift-XRT refined Analysis
  26. GRB 160408A: Fermi GBM detection
  27. GRB 160406A: Fermi GBM observation
  28. GRB 160408A: Swift-BAT refined analysis
  29. GRB 160408A: Swift detection of a short burst
  30. IPN Triangulation of GRB 160406A (short/hard)
  31. GRB 160401A: Swift/UVOT Upper Limits
  32. GRB 160401A: Zadko observatory - Gingin optical observations
  33. GRB 160401A: LT observations
  34. GRB 160401A: MASTER-IAC prompt optical observations
  35. GRB 160327A: Continued RATIR Optical and NIR Observations
  36. LIGO/Virgo G211117: LOFAR follow-up
  37. GRB 160324A: CALET Gamma-Ray Burst Monitor detection
  38. GRB 160327A: Early RAPTOR Limits
  39. GRB 160327A: JCMT SCUBA-2 sub-mm observation
  40. Konus-Wind observation of GRB 160325A
  41. GRB 160327A: Continued RATIR Optical and NIR Observations
  42. GRB 160327A: Swift-BAT refined analysis
  43. GRB 160327A: Swift/UVOT Upper Limits
  44. GRB 160327A: Swift-XRT refined Analysis
  45. GRB 160327A: RATIR Optical and NIR Afterglow Detection
  46. GRB 160327A: Swift detection of a burst
  47. GRB 160325A, Swift-BAT refined analysis
  48. GRB 160325A: GROND Upper Limits
  49. GRB 160325A: Swift-XRT refined Analysis
  50. GRB 160325A: Further Swift/UVOT Observations
  51. GRB160325A Swift/UVOT Detection
  52. GRB 160325A: Fermi-LAT detection
  53. Swift Trigger 680457 is not a GRB
  54. LIGO/Virgo G211117: CALET GBM Observations
  55. GRB 160325A: Fermi GBM detection
  56. GRB 160325A: Swift detection of a burst
  57. Swift detects GX 301-2 in very high state
  58. Fermi Gamma-ray Burst Monitor trigger 160323546 is not a GRB
  59. GRB 160321A: Possible RATIR Optical and NIR Detections
  60. GRB 160321A: Swift/UVOT Upper Limits
  61. GRB 160321A: Swift-BAT refined analysis
  62. GRB 160321A: Swift-XRT refined Analysis
  63. GRB 160316A: CALET Gamma-Ray Burst Monitor detection
  64. GRB 160321A: MASTER observations zero Galaxy latitude GRB
  65. GRB 160321A: Swift detection of a probable burst
  66. GRB 160310A: Terskol 2-m observations
  67. IPN Triangulation of GRB 160310A
  68. LIGO/Virgo G211117: EWE for NOWT follow-up of northern sky
  69. SGR 0755-2933, Swift-BAT refined analysis
  70. Swift detection of a likely new SGR: SGR 0755-2933
  71. GRB 160314A: Continued RATIR Optical and NIR Observations
  72. GRB 160314A: GROND optical/NIR observations
  73. GRB 160314B: Fermi GBM observation
  74. GRB 160314B: Fermi-LAT detection
  75. GRB 160314A: RATIR Optical and NIR Observations
  76. GRB 160313A: Swift/UVOT Upper Limits
  77. LIGO/Virgo G194575: EWE for NOWT follow-up of northern sky
  78. GRB 160314A: VLT/X-shooter redshift
  79. GRB 160314A: Swift-XRT refined Analysis
  80. GRB 160314A: Swift-BAT refined analysis
  81. GRB 160314A: Swift/UVOT Detection
  82. GRB 160228A: GROND afterglow confirmation and X-shooter host candidate redshift
  83. GRB 160314A: Swift detection of a burst
  84. GRB 160313A, Swift-BAT refined analysis
  85. Fermi GBM trigger 479509107/160312874 is not a GRB
  86. GRB 160313A: Chante-Perdrix Observatory optical observations
  87. GRB 160313A: MASTER-Net optical observations
  88. GRB 160313A: LT observations
  89. GRB 160313A: Swift-XRT refined Analysis
  90. GRB 160313A: TAROT Calern observatory optical observations
  91. GRB 160313A: RATIR Optical and NIR Observations
  92. GRB 160313A: SAO RAS observations
  93. GRB 160313A: Swift detection of a burst
  94. GRB 160310A: MASTER-Kislovods observations
  95. GRB 160310A: Further NOT observations
  96. GRB 160310A: Swift/UVOT Upper Limits
  97. GRB 160310A: RATIR Optical and NIR Observations
  98. GRB 160307A: CALET Gamma-Ray Burst Monitor detection of a possible short GRB
  99. GRB 160310A: NOT optical observations
  100. GRB 160310A: Fermi GBM observation

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