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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"

8486 results found.

  1. LIGO/Virgo G268556: Identification of a GW CBC Candidate
  2. Konus-Wind observation of GRB 170101A
  3. GRB 170101A: Swift-BAT refined analysis
  4. GRB161219B - Anticipated hyperluminal evidence
  5. GRB 161219B: Spectroscopic detection of the associated SN with OSIRIS/GTC
  6. GRB 161220A: Swift detection of a burst
  7. GRB 161219B: Swift detection of a burst with an optical afterglow
  8. GRB 161218A: CALET Gamma-Ray Burst Monitor detection
  9. GRB 161218A: Swift-BAT refined analysis
  10. Swift Trigger 727422 is not an astrophysical event.
  11. GRB 161217A: Swift detection of a burst
  12. IceCube-161210: Konus-Wind upper limits
  13. IceCube-161210: CALET Gamma-Ray Burst Monitor upper limits
  14. GRB 161214A: fading optical afterglow candidate with the LT
  15. HAWC follow-up on IceCube-161210
  16. INTEGRAL SPI-ACS and IBIS/Veto observation of IceCube-161210
  17. IceCube-161210: IceCube observation of a high-energy neutrino candidate event
  18. GRB 161129A: NOT optical observations and candidate host galaxy
  19. GRB 161202A: Swift detection of a burst
  20. GRB 161129A: Swift detection of a burst
  21. GRB 161123A: Tiled Swift observations
  22. Swift Trigger 723124 is probably not a GRB
  23. Swift Trigger 722681 is probably not a GRB
  24. GRB 161117B: Swift detection of a burst
  25. GRB 161117A: Swift detection of a burst with an optical counterpart
  26. GRB 161113A: Swift detection of a burst
  27. IceCube-161103: CALET Gamma-Ray Burst Monitor upper limits
  28. GRB 161106A: CALET Gamma-Ray Burst Monitor detection
  29. GRB 161109A: Tiled Swift observations
  30. GRB 161108A: TAROT Calern observatory optical observations
  31. GRB 161105A: TAROT La Silla observatory optical observations
  32. GRB 161108A: RATIR Afterglow Confirmation
  33. GRB 161108A: NOT candidate afterglow
  34. GRB 161108A: Swift detection of a burst
  35. GRB 161103A: an ultra-long GRB detected by Konus-Wind
  36. IceCube-161103: Konus-Wind upper limits
  37. GRB 161104A: Gemini South optical observations
  38. Search for counterpart to IceCube-161103A with ANTARES
  39. GRB 161105A: Swift detection of a burst
  40. GRB 161104A: Swift detection of a short burst
  41. INTEGRAL SPI-ACS and IBIS/Veto observation of IceCube-161103
  42. HAWC follow up of IceCube-161103
  43. IceCube-161103: IceCube observation of a very-high-energy neutrino
  44. GRB 161023A: Zadko observatory - Gingin optical observations
  45. GRB 161023A: Swift ToO observations
  46. Swift Trigger 718919 is not an astrophysical event.
  47. GRB 161022A: Fermi GBM observation
  48. GRB 161015A: further Swift-XRT follow-up observations
  49. GRB 161017A: Swift detection of a burst with a bright optical afterglow
  50. GRB 161015A: Tiled Swift observations
  51. GRB161014A: optical afterglow candidate with the LCOGT-FTS
  52. GRB 161014A: MITSuME-Akeno optical observation
  53. GRB 161011A: TSHAO afterglow candidate
  54. GRB 161011A: Swift detection of a burst
  55. GRB 161010A: Swift ToO observations
  56. GRB 161007A: AbAO optical observations
  57. GRB 161007A: Swift detection of a burst
  58. GRB 150302A: late-time imaging and optical afterglow confirmation
  59. GRB 161004B: Swift detection of a burst
  60. GRB 161004A: TSHAO optical observations
  61. GRB 161004A: Swift detection of a burst with a possible optical counterpart
  62. GRB 161001A: MASTER-OAFA and MASTER-SAAO early optical observations
  63. GRB 161001A: GROND afterglow candidate
  64. GRB 161001A: X-shooter spectroscopy, candidate host galaxy and redshift
  65. GRB 161001A: Swift detection of a burst
  66. GRB 160927A: RTT150 optical afterglow candidate
  67. GRB 160927A: Swift detection of a short hard burst
  68. GRB 160925A / Fermi 496473540: MASTER OT observations
  69. GRB 160925A: Swift ToO observations
  70. GRB 160917A: Mondy afterglow confirmation
  71. GRB 160917A: Swift/UVOT Detection
  72. GRB 160917A: Swift detection of a burst
  73. GRB 160912A, Swift-BAT refined analysis
  74. GRB 160912A: Swift detection of a burst
  75. GRB 160910A: Tiled Swift observations
  76. GRB 160905A: Swift detection of a burst with an optical counterpart
  77. Search for counterpart to IceCube-160814A with ANTARES
  78. GRB 160829A: Swift ToO observations
  79. Swift Trigger 710022 is very likely noise
  80. GRB 160826A: Swift-BAT refined analysis
  81. GRB 160826A: Swift detection of a burst
  82. GRB 160825A: Swift ToO observations
  83. GRB 160824A: Swift detection of a burst
  84. GRB 160821B: GTC follow-up observation
  85. GRB 160821B: WHT afterglow confirmation and redshift of candidate host
  86. GRB 160821B: Swift-BAT refined analysis
  87. GRB 160821B: NOT optical afterglow candidate
  88. GRB 160821B: Swift detection of a short burst
  89. INTEGRAL/SPI-ACS observation of IceCube HESE 128340 58537957
  90. GRB 160816A: RATIR Optical and NIR Afterglow Confirmation
  91. GRB 160816A: confirmed fading with the LT
  92. Fermi GBM Observations of IceCube-160806A
  93. GRB 160816A: RATIR Optical and NIR Observations
  94. GRB 160816A: LCOGT-FTN optical candidate
  95. GRB 160816A: Swift ToO observations
  96. GRB 160815A: Swift detection of a burst
  97. INTEGRAL/SPI-ACS and IBIS_VETO search for prompt gamma-ray counterpart of IceCube-160806A
  98. IceCube 160806A EHE Neutrino Candidate Event
  99. Swift Trigger 707545 is likely 4U 1850-03/GS1843-02
  100. Swift Trigger 707517 is probably not a GRB

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