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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"

28231 results found.

  1. GRB 140930B: Enhanced Swift-XRT position
  2. GRB 140928A: MAXI-GSC detection
  3. GRB 140930B: MMT confirmation of the optical afterglow
  4. GRB 140930B: ISON-Kislovodsk observations
  5. GRB 140930B: WHT detection of candidate afterglow
  6. GRB 140930B: 1.23m CAHA optical observations
  7. GRB 140930B: Swift detection of a short burst
  8. GRB140928A: Gemini-South observation
  9. GRB 140930A/MAXI J2259+524: MAXI-GSC detection
  10. GRB 140928A: LCO-Cerro Tololo further observations
  11. IPN Triangulation of GRB 140928A
  12. GRB 140928A: LCO-Cerro Tololo observations
  13. GRB 140928A: GROND Afterglow Candidate
  14. GRB 140928A: Swift-XRT observations
  15. GRB 140928A: Fermi-LAT detection
  16. GRB 140927A: Swift-UVOT analysis
  17. GRB 140927A: Swift-BAT refined analysis
  18. GRB 140927A: Swift-XRT refined Analysis
  19. GRB 140927A: Enhanced Swift-XRT position
  20. GRB 140927A: Swift detection of a burst
  21. Swift Trigger 613581 is not an astrophysical event
  22. Swift Trigger 613516 is not an astrophysical event
  23. GRB 140919A, Swift-BAT refined analysis
  24. GRB 140919A: Swift-XRT refined Analysis
  25. GRB 140919A: Swift/UVOT Detection
  26. GRB 140919A: GROND afterglow candidate
  27. GRB 140919A: Enhanced Swift-XRT position
  28. GRB 140919A: Swift-XRT observations
  29. GRB 140919A: Swift detection of a burst
  30. Swift detection of outburst from 4U 1700+24
  31. GRB 140916A: Swift/UVOT Upper Limits
  32. GRB 140916A: Swift-BAT refined analysis
  33. GRB 140916A: UKIRT J-band observations
  34. GRB 140916A: Swift-XRT refined Analysis
  35. GRB 140916A: Enhanced Swift-XRT position
  36. GRB 140916A: MITSuME Okayama upper limits
  37. GRB 140916B: iPTF Optical Observations
  38. GRB 140916A: Swift detection of a burst
  39. GRB 140907A: Continued DCT Observations
  40. GRB 140909A: Confirmation of the Swift-XRT afterglow
  41. GRB 140907A: Mondy optical observations
  42. GRB 140903A: Chandra detection of the afterglow
  43. GRB 140909A: Swift/UVOT Upper Limits
  44. GRB 140909A: Swift-XRT observations
  45. GRB 140907A: TShAO observations
  46. GRB 140907A: MASTER optical observations
  47. GRB 140907A: Nishi-Harima NIR Observations
  48. GRB 140907A: MITSuME Akeno Optical Observation
  49. IPN Triangulation of GRB 140906C (short/hard)
  50. GRB 140907A: T100 observations
  51. GRB 140907A: Swift-BAT refined analysis
  52. GRB 140907A: Swift-XRT refined Analysis
  53. GRB 140907A: Enhanced Swift-XRT position
  54. GRB 140907A: MITSuME Ishigakijima Optical Observation
  55. GRB140907A: MITSuME Okayama Optical Observation
  56. GRB140907A: Swift UVOT detection
  57. GRB 140906B: Fermi GBM Detection of a Long GRB
  58. GRB 140907A : Optical observations from Nanshan
  59. GRB 140907A: Swift detection of a burst with an optical counterpart
  60. GRB 140906A - Fermi GBM Detection
  61. GRB 140906A: iPTF optical transient candidates
  62. GRB 140903A: NOT optical and NIR observations
  63. GRB 140818B: TShAO optical upper limit
  64. GRB 140903A: ISON-Kislovodsk observations
  65. GRB 140903A: MAXI/GSC upper limit
  66. GRB 140903A: 6 GHz VLA detection
  67. GRB 140903A: Pan STARRS images of the field
  68. GRB 140901B found in ground analysis of BAT data
  69. GRB 140903A: Swift/UVOT Upper Limits
  70. GRB 140903A: P60 Optical Observations
  71. GRB140903A: Discovery Channel Telescope Optical Detection
  72. GRB 140903A: Swift-BAT refined analysis
  73. GRB 140903A: Swift-XRT refined Analysis
  74. GRB 140901A: Fermi GBM detection
  75. GRB 140831A: iPTF observations of a possible short burst detected by Fermi GBM
  76. GRB 140829A: Fermi GBM Detection
  77. GRB 140829A: iPTF optical observations
  78. GRB140818B, the review of the sky area in plate archives
  79. GRB 140828A, Swift-BAT refined analysis
  80. IPN Triangulation of GRB 140825A (very intense/long)
  81. GRB 140828A: Swift detection of a burst
  82. GRB 140818B: TLS observations
  83. GRB 140824A: optical upper limit in CrAO
  84. GRB 140824B: Swift observations
  85. GRB 140824A: NOT optical upper limits
  86. GRB 140824A: OSN optical limit
  87. GRB 140824A: Swift-XRT refined Analysis
  88. GRB 140824A: Swift-BAT refined analysis
  89. GRB 140824A: Enhanced Swift-XRT position
  90. GRB 140824A: MITSuME Ishigakijima upper limits
  91. GRB 140824A: Swift/UVOT Upper Limits
  92. GRB 140824A: Swift detection of a burst
  93. GRB 140817A: NOT optical observations
  94. Fermi GBM Trigger 140819576/ 430148973/ MASTER OT
  95. GRB 140817A: Khureltogot optical upper limit
  96. GRB 140818B: ISON-Kislovodsk and ISON-Burakan optical upper limit
  97. Fermi trigger 430148973: Swift-XRT observation
  98. GRB 140818A: GROND confirmation of afterglow candidate
  99. GRB140819A: Deep GROND Upper Limits
  100. Fermi 430148973/MASTER candidate: LCO-Sutherland observations

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