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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"

8489 results found.

  1. Swift Trigger 730513 is not an astrophysical event
  2. LIGO/Virgo G268556: ANTARES search
  3. LIGO/Virgo G268556: Fermi GBM Observations
  4. LIGO/Virgo G268556: Identification of a GW CBC Candidate
  5. Konus-Wind observation of GRB 170101A
  6. GRB 170101A: Swift-BAT refined analysis
  7. GRB161219B - Anticipated hyperluminal evidence
  8. GRB 161219B: Spectroscopic detection of the associated SN with OSIRIS/GTC
  9. GRB 161220A: Swift detection of a burst
  10. GRB 161219B: Swift detection of a burst with an optical afterglow
  11. GRB 161218A: CALET Gamma-Ray Burst Monitor detection
  12. GRB 161218A: Swift-BAT refined analysis
  13. Swift Trigger 727422 is not an astrophysical event.
  14. GRB 161217A: Swift detection of a burst
  15. IceCube-161210: Konus-Wind upper limits
  16. IceCube-161210: CALET Gamma-Ray Burst Monitor upper limits
  17. GRB 161214A: fading optical afterglow candidate with the LT
  18. HAWC follow-up on IceCube-161210
  19. INTEGRAL SPI-ACS and IBIS/Veto observation of IceCube-161210
  20. IceCube-161210: IceCube observation of a high-energy neutrino candidate event
  21. GRB 161129A: NOT optical observations and candidate host galaxy
  22. GRB 161202A: Swift detection of a burst
  23. GRB 161129A: Swift detection of a burst
  24. GRB 161123A: Tiled Swift observations
  25. Swift Trigger 723124 is probably not a GRB
  26. Swift Trigger 722681 is probably not a GRB
  27. GRB 161117B: Swift detection of a burst
  28. GRB 161117A: Swift detection of a burst with an optical counterpart
  29. GRB 161113A: Swift detection of a burst
  30. IceCube-161103: CALET Gamma-Ray Burst Monitor upper limits
  31. GRB 161106A: CALET Gamma-Ray Burst Monitor detection
  32. GRB 161109A: Tiled Swift observations
  33. GRB 161108A: TAROT Calern observatory optical observations
  34. GRB 161105A: TAROT La Silla observatory optical observations
  35. GRB 161108A: RATIR Afterglow Confirmation
  36. GRB 161108A: NOT candidate afterglow
  37. GRB 161108A: Swift detection of a burst
  38. GRB 161103A: an ultra-long GRB detected by Konus-Wind
  39. IceCube-161103: Konus-Wind upper limits
  40. GRB 161104A: Gemini South optical observations
  41. Search for counterpart to IceCube-161103A with ANTARES
  42. GRB 161105A: Swift detection of a burst
  43. GRB 161104A: Swift detection of a short burst
  44. INTEGRAL SPI-ACS and IBIS/Veto observation of IceCube-161103
  45. HAWC follow up of IceCube-161103
  46. IceCube-161103: IceCube observation of a very-high-energy neutrino
  47. GRB 161023A: Zadko observatory - Gingin optical observations
  48. GRB 161023A: Swift ToO observations
  49. Swift Trigger 718919 is not an astrophysical event.
  50. GRB 161022A: Fermi GBM observation
  51. GRB 161015A: further Swift-XRT follow-up observations
  52. GRB 161017A: Swift detection of a burst with a bright optical afterglow
  53. GRB 161015A: Tiled Swift observations
  54. GRB161014A: optical afterglow candidate with the LCOGT-FTS
  55. GRB 161014A: MITSuME-Akeno optical observation
  56. GRB 161011A: TSHAO afterglow candidate
  57. GRB 161011A: Swift detection of a burst
  58. GRB 161010A: Swift ToO observations
  59. GRB 161007A: AbAO optical observations
  60. GRB 161007A: Swift detection of a burst
  61. GRB 150302A: late-time imaging and optical afterglow confirmation
  62. GRB 161004B: Swift detection of a burst
  63. GRB 161004A: TSHAO optical observations
  64. GRB 161004A: Swift detection of a burst with a possible optical counterpart
  65. GRB 161001A: MASTER-OAFA and MASTER-SAAO early optical observations
  66. GRB 161001A: GROND afterglow candidate
  67. GRB 161001A: X-shooter spectroscopy, candidate host galaxy and redshift
  68. GRB 161001A: Swift detection of a burst
  69. GRB 160927A: RTT150 optical afterglow candidate
  70. GRB 160927A: Swift detection of a short hard burst
  71. GRB 160925A / Fermi 496473540: MASTER OT observations
  72. GRB 160925A: Swift ToO observations
  73. GRB 160917A: Mondy afterglow confirmation
  74. GRB 160917A: Swift/UVOT Detection
  75. GRB 160917A: Swift detection of a burst
  76. GRB 160912A, Swift-BAT refined analysis
  77. GRB 160912A: Swift detection of a burst
  78. GRB 160910A: Tiled Swift observations
  79. GRB 160905A: Swift detection of a burst with an optical counterpart
  80. Search for counterpart to IceCube-160814A with ANTARES
  81. GRB 160829A: Swift ToO observations
  82. Swift Trigger 710022 is very likely noise
  83. GRB 160826A: Swift-BAT refined analysis
  84. GRB 160826A: Swift detection of a burst
  85. GRB 160825A: Swift ToO observations
  86. GRB 160824A: Swift detection of a burst
  87. GRB 160821B: GTC follow-up observation
  88. GRB 160821B: WHT afterglow confirmation and redshift of candidate host
  89. GRB 160821B: Swift-BAT refined analysis
  90. GRB 160821B: NOT optical afterglow candidate
  91. GRB 160821B: Swift detection of a short burst
  92. INTEGRAL/SPI-ACS observation of IceCube HESE 128340 58537957
  93. GRB 160816A: RATIR Optical and NIR Afterglow Confirmation
  94. GRB 160816A: confirmed fading with the LT
  95. Fermi GBM Observations of IceCube-160806A
  96. GRB 160816A: RATIR Optical and NIR Observations
  97. GRB 160816A: LCOGT-FTN optical candidate
  98. GRB 160816A: Swift ToO observations
  99. GRB 160815A: Swift detection of a burst
  100. INTEGRAL/SPI-ACS and IBIS_VETO search for prompt gamma-ray counterpart of IceCube-160806A

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