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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"

27630 results found.

  1. GRB 161104A: GROND observations
  2. GRB 161105A: Swift detection of a burst
  3. GRB 161104A: Swift/UVOT Upper Limits
  4. GRB 161104A, Swift-BAT refined analysis
  5. GRB 161104A: Swift-XRT refined Analysis
  6. Fermi GBM Observations of IceCube-161103
  7. GRB 160928A: The first GRB detected by POLAR
  8. IceCube-161103: Swift-XRT observations
  9. GRB 161104A: Swift detection of a short burst
  10. IceCube-161103: MASTER follow-up observations
  11. GRB 161020A: Fermi GBM observation
  12. Fermi GBM trigger 499467682/161029876 is not a GRB
  13. GRB161023A: AstroSat CZTI detection
  14. GRB 161023A: GROND Observations
  15. GRB 161023A: TAROT La Silla observatory optical observations
  16. GRB 161023A: Zadko observatory - Gingin optical observations
  17. GRB 161023A: Watcher optical observations
  18. GRB 161023A (Integral trigger 7613) MASTER-Net bright OT detection
  19. Swift Trigger 718919 is not an astrophysical event.
  20. GRB 161022A: Swift-BAT refined analysis
  21. Swift Trigger 718766 is not an astrophysical event.
  22. GRB 161022A: RATIR Optical and NIR Observations
  23. GRB 161022A: Swift/UVOT Upper Limits
  24. GRB 161022A: Fermi GBM observation
  25. GRB 161022A: NOT optical observations
  26. GRB 161022A: Swift-XRT refined Analysis
  27. IPN Triangulation of GRB 161020B
  28. GRB 161022A: LT observations
  29. GRB 161022A: TAROT Calern observatory optical observations
  30. GRB 161022A: Swift detection of a burst
  31. GRB 161020A: A long GRB detected by INTEGRAL
  32. Konus-Wind observation of GRB 161017A
  33. GRB 161017A: Swift-BAT refined analysis
  34. GRB 161017A: Lomonosov Gamma Ray and MASTER Optical prompt observations
  35. GRB 161017A: Swift/UVOT Detection
  36. GRB 161017A: Swift-XRT refined Analysis
  37. GRB 161017A: Fermi GBM observation
  38. GRB 161014A: Continued RATIR Optical and NIR Observations
  39. GRB 161015A: Swift/UVOT observations
  40. GRB 161017A: Swift detection of a burst with a bright optical afterglow
  41. GRB161017.74 MASTER-Net OT detection
  42. GRB 161014A: VLT/X-shooter redshift confirmation
  43. GRB161015A: AstroSat CZTI detection
  44. Konus-Wind observation of GRB 161014A
  45. GRB 161015A: Fermi GBM detection
  46. GRB 161015A: Fermi-LAT detection
  47. GRB161004A: Further analysis of the burst nature
  48. GRB 161014A: RATIR Optical and NIR Observations
  49. GRB 161014A: Fermi GBM observation
  50. GRB 161014A: Swift-XRT refined Analysis
  51. GRB 161014A: Swift-BAT refined analysis
  52. GRB 161014A: AROMA-N Optical Observation
  53. GRB 161014A: Swift/UVOT Detection
  54. GRB161014A: NOT optical observations
  55. GRB 161011A: RATIR Optical and NIR Observations
  56. GRB 161014A: Swift-XRT and UVOT afterglow detection
  57. GRB 161014A : Xinglong TNT optical observation
  58. GRB161014A: optical afterglow candidate with the LCOGT-FTS
  59. GRB 161014A: MITSuME-Akeno optical observation
  60. GRB 161014A: Swift detection of a burst
  61. GRB 161010A: Swift/UVOT Possible Detection
  62. GRB 161011A, Swift-BAT refined analysis
  63. GRB 161011A: Swift/UVOT Upper Limits
  64. GRB 161011A: Swift-XRT refined Analysis
  65. GRB 161011A: Swift detection of a burst
  66. GRB 161007A: NOT optical observations
  67. GRB 161007A: Swift-BAT refined analysis
  68. GRB 161007A: Swift/UVOT Upper Limits
  69. GRB 161007A: Swift-XRT refined Analysis
  70. GRB 161007A: GTC observations
  71. GRB 161007A: MASTER-net early optical observations
  72. GRB 161007A: Swift detection of a burst
  73. GRB 160821A: Maisoncelles observatory optical observations
  74. GRB 160925A: Kottamia R-band observation
  75. Konus-Wind observation of GRB 161004B
  76. GRB 161004B: CALET Gamma-Ray Burst Monitor detection
  77. GRB 161004A: Swift-BAT refined analysis
  78. GRB 161004B: Fermi GBM detection
  79. GRB 161004B: Swift/UVOT Upper Limits
  80. GRB161004B: AstroSat CZTI detection
  81. GRB 161004B: Swift-BAT refined analysis
  82. GRB 161004B: Swift-XRT refined Analysis
  83. GRB 161004A: RATIR Optical and NIR Observations
  84. GRB 160917B: Lomonosov BDRG gamma ray discovery
  85. GRB 160915A: Lomonosov BDRG gamma ray detection
  86. GRB 161004B: Swift detection of a burst
  87. GRB 161004A: Swift-XRT refined Analysis
  88. GRB 161004A: Swift/UVOT Detection
  89. Swift Trigger 715209 is not an astrophysical event
  90. GRB 161004A: Bassano Bresciano Observatory upper limit
  91. GRB 161004A: Swift detection of a burst with a possible optical counterpart
  92. Konus-Wind observation of GRB 161001A (short/hard ?)
  93. GRB 161001A: MASTER-OAFA and MASTER-SAAO early optical observations
  94. GRB 161001A: GROND afterglow candidate
  95. GRB 161001A, Swift-BAT refined analysis (likely a short GRB)
  96. GRB 161001A: Fermi GBM detection
  97. GRB 161001A: Swift-XRT refined Analysis
  98. GRB 161001A: Swift/UVOT Upper Limits
  99. GRB 161001A: Swift detection of a burst
  100. Fermi GBM trigger 496791348/160928900 is not a GRB

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