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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

35265 results found.

  1. Fermi GBM trigger 511851891/170322212 is not a GRB
  2. INTEGRAL SPI-ACS observation of AMON IceCube EHE 80305071 129307
  3. IPN Triangulation of GRB 170320A (long/intense)
  4. GRB 170318A: KAIT Optical Upper Limit
  5. GRB 170317A: Mondy optical observations
  6. GRB 170318B: Swift-BAT refined analysis
  7. GRB 170317A: POLAR observation
  8. GRB 170318B: RATIR Optical and NIR Observations
  9. GRB 170317A: RATIR Optical and NIR Observations
  10. GRB 170318B: Swift/UVOT Upper Limits
  11. GRB 170318B: Swift-XRT refined Analysis
  12. GRB 170318A: Swift-XRT refined Analysis
  13. GRB 170318A: RATIR Optical and NIR Observations
  14. GRB 170318A: Swift/UVOT Upper Limits
  15. GRB 170318B: Fermi GBM observation
  16. GRB 170318A: Swift-BAT refined analysis
  17. GRB 170317A: RATIR Optical and NIR Observations
  18. GRB 170318B: Enhanced Swift-XRT position
  19. GRB 170318B: Prompt enhanced Swift-XRT position
  20. GRB 170318B: Swift detection of a burst
  21. GRB 170318A: Enhanced Swift-XRT position
  22. GRB 170315A: POLAR observation
  23. GRB 170318A: Prompt enhanced Swift-XRT position
  24. GRB 170318A: Swift detection of a burst
  25. GRB 170317A: LCO FTN observations
  26. GRB 170317A: MITSuME Okayama Optical Observation
  27. GRB 170317A: Swift-BAT refined analysis
  28. GRB 170317A: Swift/UVOT Detection
  29. GRB 170317A: Mondy optical observations
  30. GRB 170317A: MITSuME Okayama Ks-band upper-limit
  31. GRB 170317A: Swift-XRT refined Analysis
  32. GRB 170317A: GMG observation
  33. GRB 170317A : Xinglong TNT optical observation
  34. GRB 170317A: Enhanced Swift-XRT position
  35. GRB 170317A: ISON-Ussuriysk aferglow confirmation
  36. GRB 170317A: Swift detection of a burst with an optical counterpart
  37. LIGO/Virgo G277583: Swift/BAT data search
  38. GRB 170307A: 15 GHz upper limit from AMI
  39. GRB 170311B: AstroSat CZTI detection
  40. Fermi GBM trigger 510642159/170308210 is not a GRB
  41. Konus-Wind observation of GRB 170311B
  42. IPN Triangulation of GRB 170311B (long/very intense)
  43. GRB 170311A: VLT observations
  44. INTEGRAL observation of IceCube HESE 65274589 129281
  45. GRB 170311A: Swift-BAT refined analysis
  46. GRB 170311A: Further GROND analysis
  47. GRB 170311A: Swift-XRT refined Analysis
  48. GRB 170311A: Swift/UVOT Upper Limits
  49. GRB 170311A: Enhanced Swift-XRT position
  50. GRB 170311A: GROND upper limits
  51. GRB 170311A: MASTER-OAFA early optical observations
  52. GRB 170311A: Swift detection of a burst
  53. GRB 170309A: POLAR Observation
  54. GRB170306A: SALT observations
  55. GRB 170306A: GROND afterglow detection
  56. GRB 170306B: POLAR observation
  57. GRB 170307A (trigger 741528): Swift-BAT refined analysis
  58. GRB 170305A: POLAR observation
  59. GRB 170307A: Fermi GBM observation
  60. Swift Trigger 741528: a possible GRB
  61. Konus-Wind observation of GRB 170306B
  62. GRB 170306B: Swift-XRT observations
  63. GRB 170306A, Swift-BAT refined analysis
  64. GRB 170306A: Swift-XRT refined Analysis
  65. GRB 170306B: Fermi GBM detection
  66. GRB 170306B: Fermi-LAT detection
  67. GRB 170306B: Tiled Swift observations
  68. IPN Triangulation of GRB 170305A (short)
  69. GRB 170306A: Swift/UVOT Upper Limits
  70. GRB 170306A: GROND observations
  71. GRB 170306A: LCO Cerro Tololo observations
  72. GRB 170306A: Swift detection of a burst
  73. GRB170305A: Fermi GBM detection
  74. GRB 170304A: Fermi GBM observation
  75. LIGO/Virgo G275404: HAWC follow-up
  76. Konus-Wind observation of GRB 170228A
  77. Fermi GBM trigger 510207699/170303182 is not a GRB
  78. GRB 170228B CALET Gamma-Ray Burst Monitor detection
  79. LIGO/Virgo G275697: Fermi GBM Upper Limits
  80. LIGO/Virgo G268556, G270580, G274296, and G275404: Konus-Wind observations
  81. GRB 170228B: POLAR Observation
  82. LIGO/Virgo G275404: Fermi GBM Upper Limits
  83. GRB 170228A: AstroSat CZTI detection
  84. GRB 170206B: 15 GHz upper limits from AMI
  85. GRB 170228A: Fermi GBM observation
  86. GRB 170228A: Fermi-LAT detection
  87. LIGO/Virgo G275697: Konus-Wind observations
  88. LIGO/Virgo G275697: Swift/BAT data search
  89. GRB 170222A: CALET Gamma-Ray Burst Monitor detection
  90. LIGO/Virgo G275404: Swift/BAT data search
  91. LIGO/Virgo G274296: Swift/BAT data search
  92. GRB 170220A: POLAR Observation
  93. Konus-Wind observation of GRB 170222A
  94. GRB 170222A: Swift-XRT observations
  95. GRB 170222A: Fermi GBM observation
  96. LIGO/Virgo G274296: HAWC follow-up
  97. GRB 170222A: Tiled Swift observations
  98. GRB 170222A: Swift ToO observations
  99. IPN Triangulation of GRB 170222A (short/hard)
  100. GRB 170219A: POLAR Observation

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