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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"

28118 results found.

  1. GRB 140928A: Swift-XRT observations
  2. GRB 140928A: Fermi-LAT detection
  3. GRB 140927A: Swift-UVOT analysis
  4. GRB 140927A: Swift-BAT refined analysis
  5. GRB 140927A: Swift-XRT refined Analysis
  6. GRB 140927A: Enhanced Swift-XRT position
  7. GRB 140927A: Swift detection of a burst
  8. Swift Trigger 613581 is not an astrophysical event
  9. Swift Trigger 613516 is not an astrophysical event
  10. GRB 140919A, Swift-BAT refined analysis
  11. GRB 140919A: Swift-XRT refined Analysis
  12. GRB 140919A: Swift/UVOT Detection
  13. GRB 140919A: GROND afterglow candidate
  14. GRB 140919A: Enhanced Swift-XRT position
  15. GRB 140919A: Swift-XRT observations
  16. GRB 140919A: Swift detection of a burst
  17. Swift detection of outburst from 4U 1700+24
  18. GRB 140916A: Swift/UVOT Upper Limits
  19. GRB 140916A: Swift-BAT refined analysis
  20. GRB 140916A: UKIRT J-band observations
  21. GRB 140916A: Swift-XRT refined Analysis
  22. GRB 140916A: Enhanced Swift-XRT position
  23. GRB 140916A: MITSuME Okayama upper limits
  24. GRB 140916B: iPTF Optical Observations
  25. GRB 140916A: Swift detection of a burst
  26. GRB 140907A: Continued DCT Observations
  27. GRB 140909A: Confirmation of the Swift-XRT afterglow
  28. GRB 140907A: Mondy optical observations
  29. GRB 140903A: Chandra detection of the afterglow
  30. GRB 140909A: Swift/UVOT Upper Limits
  31. GRB 140909A: Swift-XRT observations
  32. GRB 140907A: TShAO observations
  33. GRB 140907A: MASTER optical observations
  34. GRB 140907A: Nishi-Harima NIR Observations
  35. GRB 140907A: MITSuME Akeno Optical Observation
  36. IPN Triangulation of GRB 140906C (short/hard)
  37. GRB 140907A: T100 observations
  38. GRB 140907A: Swift-BAT refined analysis
  39. GRB 140907A: Swift-XRT refined Analysis
  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 140906B: Fermi GBM Detection of a Long GRB
  45. GRB 140907A : Optical observations from Nanshan
  46. GRB 140907A: Swift detection of a burst with an optical counterpart
  47. GRB 140906A - Fermi GBM Detection
  48. GRB 140906A: iPTF optical transient candidates
  49. GRB 140903A: NOT optical and NIR observations
  50. GRB 140818B: TShAO optical upper limit
  51. GRB 140903A: ISON-Kislovodsk observations
  52. GRB 140903A: MAXI/GSC upper limit
  53. GRB 140903A: 6 GHz VLA detection
  54. GRB 140903A: Pan STARRS images of the field
  55. GRB 140901B found in ground analysis of BAT data
  56. GRB 140903A: Swift/UVOT Upper Limits
  57. GRB 140903A: P60 Optical Observations
  58. GRB140903A: Discovery Channel Telescope Optical Detection
  59. GRB 140903A: Swift-BAT refined analysis
  60. GRB 140903A: Swift-XRT refined Analysis
  61. GRB 140901A: Fermi GBM detection
  62. GRB 140831A: iPTF observations of a possible short burst detected by Fermi GBM
  63. GRB 140829A: Fermi GBM Detection
  64. GRB 140829A: iPTF optical observations
  65. GRB140818B, the review of the sky area in plate archives
  66. GRB 140828A, Swift-BAT refined analysis
  67. IPN Triangulation of GRB 140825A (very intense/long)
  68. GRB 140828A: Swift detection of a burst
  69. GRB 140818B: TLS observations
  70. GRB 140824A: optical upper limit in CrAO
  71. GRB 140824B: Swift observations
  72. GRB 140824A: NOT optical upper limits
  73. GRB 140824A: OSN optical limit
  74. GRB 140824A: Swift-XRT refined Analysis
  75. GRB 140824A: Swift-BAT refined analysis
  76. GRB 140824A: Enhanced Swift-XRT position
  77. GRB 140824A: MITSuME Ishigakijima upper limits
  78. GRB 140824A: Swift/UVOT Upper Limits
  79. GRB 140824A: Swift detection of a burst
  80. GRB 140817A: NOT optical observations
  81. Fermi GBM Trigger 140819576/ 430148973/ MASTER OT
  82. GRB 140817A: Khureltogot optical upper limit
  83. GRB 140818B: ISON-Kislovodsk and ISON-Burakan optical upper limit
  84. Fermi trigger 430148973: Swift-XRT observation
  85. GRB 140818A: GROND confirmation of afterglow candidate
  86. GRB140819A: Deep GROND Upper Limits
  87. Fermi 430148973/MASTER candidate: LCO-Sutherland observations
  88. Fermi trigg_num 430148973: OSN I-band observations
  89. GRB 140818B, Swift-BAT refined analysis
  90. Fermi trigg_num 430148973: bright OT inside large error box!
  91. GRB 140818B: Swift/UVOT Upper Limits
  92. GRB 140818B: Swift-XRT refined Analysis
  93. GRB 140818B: Fermi GBM detection
  94. GRB140818B : GROND afterglow candidate
  95. GRB 140818B: Enhanced Swift-XRT position
  96. GRB 140818B: OSN I-band afterglow candidate
  97. GRB 140817A: Swift/UVOT Afterglow Detection
  98. GRB 140818B: Swift detection of a burst
  99. Swift detection of SAX J1712.6-3739
  100. GRB 140818A: Swift-XRT and UVOT potential afterglow detection

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