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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"

19685 results found.

  1. GRB 140930B: Swift/UVOT Upper Limits
  2. GRB 140930B: Swift-XRT refined Analysis
  3. GRB 140930B: Enhanced Swift-XRT position
  4. GRB 140928A: MAXI-GSC detection
  5. GRB 140930B: ISON-Kislovodsk observations
  6. GRB 140930B: WHT detection of candidate afterglow
  7. GRB 140930B: 1.23m CAHA optical observations
  8. GRB 140930B: Swift detection of a short burst
  9. GRB140928A: Gemini-South observation
  10. IPN Triangulation of GRB 140928A
  11. GRB 140928A: GROND Afterglow Candidate
  12. GRB 140928A: Swift-XRT observations
  13. GRB 140928A: Fermi-LAT detection
  14. GRB 140927A: Swift-UVOT analysis
  15. GRB 140927A: Enhanced Swift-XRT position
  16. GRB 140927A: Swift detection of a burst
  17. GRB 140919A: Swift/UVOT Detection
  18. GRB 140919A: GROND afterglow candidate
  19. GRB 140919A: Enhanced Swift-XRT position
  20. GRB 140919A: Swift/UVOT observations
  21. GRB 140919A: Swift-XRT observations
  22. Swift detection of outburst from 4U 1700+24
  23. GRB 140916A: Swift/UVOT Upper Limits
  24. GRB 140916A: UKIRT J-band observations
  25. GRB 140916A: Swift-XRT refined Analysis
  26. GRB 140916A: Enhanced Swift-XRT position
  27. GRB 140916A: MITSuME Okayama upper limits
  28. GRB 140916A: Swift detection of a burst
  29. GRB 140907A: Continued DCT Observations
  30. GRB 140909A: Confirmation of the Swift-XRT afterglow
  31. GRB 140907A: Mondy optical observations
  32. GRB 140909A: Swift/UVOT Upper Limits
  33. GRB 140909A: Swift-XRT observations
  34. GRB 140907A: TShAO observations
  35. GRB 140909A: Swift detection of a GRB
  36. GRB 140907A: Nishi-Harima NIR Observations
  37. GRB 140907A: MITSuME Akeno Optical Observation
  38. IPN Triangulation of GRB 140906C (short/hard)
  39. GRB 140907A: T100 observations
  40. GRB 140907A: Enhanced Swift-XRT position
  41. GRB 140907A: MITSuME Ishigakijima Optical Observation
  42. GRB140907A: MITSuME Okayama Optical Observation
  43. GRB140907A: Swift UVOT detection
  44. GRB 140907A : Optical observations from Nanshan
  45. GRB 140907A: Swift detection of a burst with an optical counterpart
  46. GRB 140906A: iPTF optical transient candidates
  47. GRB 140903A: NOT optical and NIR observations
  48. GRB 140818B: TShAO optical upper limit
  49. GRB 140903A: ISON-Kislovodsk observations
  50. GRB 140903A: MAXI/GSC upper limit
  51. GRB 140903A: Pan STARRS images of the field
  52. GRB 140903A: Swift/UVOT Upper Limits
  53. GRB 140903A: P60 Optical Observations
  54. GRB140903A: Discovery Channel Telescope Optical Detection
  55. GRB 140903A: Swift-XRT refined Analysis
  56. GRB 140831A: iPTF observations of a possible short burst detected by Fermi GBM
  57. IPN Triangulation of GRB 140825A (very intense/long)
  58. GRB 140818B: TLS observations
  59. GRB 140824A: optical upper limit in CrAO
  60. Swift Mission Operations Center Moving Tomorrow
  61. GRB 140824A: NOT optical upper limits
  62. GRB 140824A: OSN optical limit
  63. GRB 140824A: Enhanced Swift-XRT position
  64. GRB 140824A: MITSuME Ishigakijima upper limits
  65. GRB 140824A: Swift/UVOT Upper Limits
  66. GRB 140824A: Swift detection of a burst
  67. GRB 140817A: NOT optical observations
  68. GRB 140817A: Khureltogot optical upper limit
  69. GRB 140818B: ISON-Kislovodsk and ISON-Burakan optical upper limit
  70. Fermi trigger 430148973: Swift-XRT observation
  71. GRB 140818A: GROND confirmation of afterglow candidate
  72. GRB140819A: Deep GROND Upper Limits
  73. Fermi trigg_num 430148973: OSN I-band observations
  74. GRB 140818B: Swift/UVOT Upper Limits
  75. GRB140818B : GROND afterglow candidate
  76. GRB 140818B: Enhanced Swift-XRT position
  77. GRB 140818B: OSN I-band afterglow candidate
  78. GRB 140817A: Swift/UVOT Afterglow Detection
  79. GRB 140818B: Swift detection of a burst
  80. GRB 140818A - Fermi GBM Detection
  81. Swift detection of SAX J1712.6-3739
  82. GRB 140818A: Swift-XRT and UVOT potential afterglow detection
  83. Konus-Wind observation of GRB 140817A
  84. GRB 140817A: Enhanced Swift-XRT position
  85. GRB 140817A: Swift detection of a burst
  86. GRB 140815A: GROND afterglow candidate
  87. Swift Trigger 609694 is probably not an astrophysical source
  88. GRB 140815A: Swift-XRT observations
  89. GRB 140815A: A long GRB detected by INTEGRAL
  90. GRB 140814A: Swift-XRT and UVOT observations
  91. GRB 140814A: Swift-XRT and UVOT observations
  92. GRB 140814A: MAXI/GSC detection
  93. Swift Mission Operations Center Moving
  94. Swift trigger 609139 is probably 4U 1850-03
  95. Swift observations of possible GRB 140809A candidate
  96. GRB 140809A : Virtual Telescope optical observations
  97. GRB 140808A: Swift/UVOT Upper Limits
  98. GRB 140808A: Swift-XRT observations
  99. GRB 140801A: AAO optical observations
  100. GRB 140801A: GROND Afterglow detection, unbroken decay

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