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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"

24572 results found.

  1. GRB 161109A: Fermi GBM observation
  2. GRB 161109A: Fermi-LAT detection
  3. GRB 161108A, Swift-BAT refined analysis
  4. GRB 161108A: Swift-XRT refined Analysis
  5. Fermi LAT Gamma-ray Observations of IceCube-161103
  6. GRB 161103A: an ultra-long GRB detected by Konus-Wind
  7. GRB 161106A: Fermi GBM detection
  8. IceCube-161103: Konus-Wind upper limits
  9. GRB 161105A: Swift-BAT refined analysis
  10. Search for counterpart to IceCube-161103A with ANTARES
  11. GRB 161105A: MASTER-IAC early optical observations
  12. GRB 161105A: Swift detection of a burst
  13. GRB 161104A, Swift-BAT refined analysis
  14. Fermi GBM Observations of IceCube-161103
  15. GRB 160928A: The first GRB detected by POLAR
  16. GRB 161104A: Swift detection of a short burst
  17. INTEGRAL SPI-ACS and IBIS/Veto observation of IceCube-161103
  18. IceCube-161103: MASTER follow-up observations
  19. HAWC follow up of IceCube-161103
  20. IceCube-161103: IceCube observation of a very-high-energy neutrino
  21. GRB 161020A: Fermi GBM observation
  22. GRB 161023A: GROND Observations
  23. Konus-Wind observation of GRB 161023A
  24. GRB 161023A: LCOGT-FTS optical observations
  25. GRB 161023A: A long GRB detected by INTEGRAL
  26. GRB 161023A (Integral trigger 7613) MASTER-Net bright OT detection
  27. Swift Trigger 718919 is not an astrophysical event.
  28. GRB 161022A: Swift-BAT refined analysis
  29. GRB 161022A: Fermi GBM observation
  30. GRB 161022A: NOT optical observations
  31. Konus-Wind observation of GRB 161020B
  32. IPN Triangulation of GRB 161020B
  33. GRB 161022A: LT observations
  34. GRB 161022A: Swift detection of a burst
  35. GRB 161020A: A long GRB detected by INTEGRAL
  36. GRB 161015A: further Swift-XRT follow-up observations
  37. Konus-Wind observation of GRB 161017A
  38. GRB 161017A: LT optical observations
  39. GRB 161017A: TNG spectroscopy and redshift confirmation
  40. GRB 161017A: Swift-BAT refined analysis
  41. GRB 161017A: Lomonosov Gamma Ray and MASTER Optical prompt observations
  42. GRB 161017A: Swift-XRT refined Analysis
  43. GRB 161017A: MITSuME Akeno Optical Observation
  44. GRB 161017A: Fermi GBM observation
  45. GRB 161015A: Swift/UVOT observations
  46. GRB161017.74 MASTER-Net OT detection
  47. Konus-Wind observation of GRB 161015A
  48. GRB 161014A: VLT/X-shooter redshift confirmation
  49. Konus-Wind observation of GRB 161014A
  50. GRB 161015A: Swift-XRT observations
  51. GRB 161015A: Fermi GBM detection
  52. GRB 161015A: Fermi-LAT detection
  53. GRB161004A: Further analysis of the burst nature
  54. GRB 161014A: Fermi GBM observation
  55. GRB 161014A: Swift-BAT refined analysis
  56. GRB 161014A: Continued MITSuME Akeno Optical Observation
  57. GRB161014A: NOT optical observations
  58. GRB 161014A: Kanata optical observation
  59. GRB 161014A : Xinglong TNT optical observation
  60. GRB 161014A: MITSuME-Akeno optical observation
  61. GRB 161014A: Swift detection of a burst
  62. GRB 161011A, Swift-BAT refined analysis
  63. Konus-Wind observation of GRB 161010A
  64. GRB 161010A: a long GRB detected by INTEGRAL
  65. GRB 161007A: Swift-BAT refined analysis
  66. GRB 161007A: Swift-XRT refined Analysis
  67. GRB 161007A: MASTER-net early optical observations
  68. GRB 161007A: Swift detection of a burst
  69. GRB 160925A: Kottamia R-band observation
  70. Konus-Wind observation of GRB 161004B
  71. GRB 160927A: GTC observations
  72. GRB 161004A: Swift-BAT refined analysis
  73. GRB 150302A: late-time imaging and optical afterglow confirmation
  74. GRB 161004B: Fermi GBM detection
  75. GRB 161004B: Swift-BAT refined analysis
  76. GRB 161004B: Swift detection of a burst
  77. GRB 161004A: Swift-XRT refined Analysis
  78. GRB 161004A: Swift detection of a burst with a possible optical counterpart
  79. GRB 161001A: MASTER-OAFA and MASTER-SAAO early optical observations
  80. GRB 161001A: GROND afterglow candidate
  81. GRB 161001A, Swift-BAT refined analysis (likely a short GRB)
  82. GRB 161001A: Fermi GBM detection
  83. GRB 161001A: Swift-XRT refined Analysis
  84. GRB 161001A: Swift detection of a burst
  85. GRB 160927A: Magellan imaging
  86. GRB 160927A: Swift-BAT refined analysis
  87. GRB 160927A: NOT optical observations
  88. GRB 160927A: GROND Observations
  89. GRB160927A: D50 optical limit
  90. GRB 160927A: RTT150 optical afterglow candidate
  91. GRB 160927A: Swift detection of a short hard burst
  92. GRB 160925A: MITSuME Akeno Optical Observations
  93. GRB 160925A: Bassano Bresciano Photometry of MASTER optical transient
  94. GRB 160925A / Fermi 496473540: Global MASTER Net OT discovery
  95. GRB 160917A: Swift-BAT refined analysis
  96. GRB 160917A: Fermi GBM observation
  97. GRB 160917A: Swift detection of a burst
  98. GRB 160912A, Swift-BAT refined analysis
  99. GRB 160912A Liverpool Telescope optical afterglow
  100. GRB 160912A: Swift-XRT refined Analysis

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