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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"

36151 results found.

  1. GRB 170318B: Fermi GBM observation
  2. GRB 170318A: Swift-BAT refined analysis
  3. GRB 170317A: RATIR Optical and NIR Observations
  4. GRB 170318B: Enhanced Swift-XRT position
  5. GRB 170318B: Prompt enhanced Swift-XRT position
  6. GRB 170318B: Swift detection of a burst
  7. GRB 170318A: Enhanced Swift-XRT position
  8. GRB 170315A: POLAR observation
  9. GRB 170318A: Prompt enhanced Swift-XRT position
  10. GRB 170318A: Swift detection of a burst
  11. GRB 170317A: LCO FTN observations
  12. GRB 170317A: MITSuME Okayama Optical Observation
  13. GRB 170317A: Swift-BAT refined analysis
  14. GRB 170317A: Swift/UVOT Detection
  15. GRB 170317A: Mondy optical observations
  16. GRB 170317A: MITSuME Okayama Ks-band upper-limit
  17. GRB 170317A: Swift-XRT refined Analysis
  18. GRB 170317A: GMG observation
  19. GRB 170317A : Xinglong TNT optical observation
  20. GRB 170317A: Enhanced Swift-XRT position
  21. GRB 170317A: ISON-Ussuriysk aferglow confirmation
  22. GRB 170317A: Swift detection of a burst with an optical counterpart
  23. LIGO/Virgo G277583: Swift/BAT data search
  24. GRB 170307A: 15 GHz upper limit from AMI
  25. GRB 170311B: AstroSat CZTI detection
  26. Fermi GBM trigger 510642159/170308210 is not a GRB
  27. Konus-Wind observation of GRB 170311B
  28. IPN Triangulation of GRB 170311B (long/very intense)
  29. GRB 170311A: VLT observations
  30. INTEGRAL observation of IceCube HESE 65274589 129281
  31. GRB 170311A: Swift-BAT refined analysis
  32. GRB 170311A: Further GROND analysis
  33. GRB 170311A: Swift-XRT refined Analysis
  34. GRB 170311A: Swift/UVOT Upper Limits
  35. GRB 170311A: Enhanced Swift-XRT position
  36. GRB 170311A: GROND upper limits
  37. GRB 170311A: MASTER-OAFA early optical observations
  38. GRB 170311A: Swift detection of a burst
  39. GRB 170309A: POLAR Observation
  40. GRB170306A: SALT observations
  41. GRB 170306A: GROND afterglow detection
  42. GRB 170306B: POLAR observation
  43. GRB 170307A (trigger 741528): Swift-BAT refined analysis
  44. GRB 170305A: POLAR observation
  45. GRB 170307A: Fermi GBM observation
  46. Swift Trigger 741528: a possible GRB
  47. Konus-Wind observation of GRB 170306B
  48. GRB 170306B: Swift-XRT observations
  49. GRB 170306A, Swift-BAT refined analysis
  50. GRB 170306A: Swift-XRT refined Analysis
  51. GRB 170306B: Fermi GBM detection
  52. GRB 170306B: Fermi-LAT detection
  53. GRB 170306B: Tiled Swift observations
  54. IPN Triangulation of GRB 170305A (short)
  55. GRB 170306A: Swift/UVOT Upper Limits
  56. GRB 170306A: GROND observations
  57. GRB 170306A: LCO Cerro Tololo observations
  58. GRB 170306A: Swift detection of a burst
  59. GRB170305A: Fermi GBM detection
  60. GRB 170304A: Fermi GBM observation
  61. LIGO/Virgo G275404: HAWC follow-up
  62. Konus-Wind observation of GRB 170228A
  63. Fermi GBM trigger 510207699/170303182 is not a GRB
  64. GRB 170228B CALET Gamma-Ray Burst Monitor detection
  65. LIGO/Virgo G275697: Fermi GBM Upper Limits
  66. LIGO/Virgo G268556, G270580, G274296, and G275404: Konus-Wind observations
  67. GRB 170228B: POLAR Observation
  68. LIGO/Virgo G275404: Fermi GBM Upper Limits
  69. GRB 170228A: AstroSat CZTI detection
  70. GRB 170206B: 15 GHz upper limits from AMI
  71. GRB 170228A: Fermi GBM observation
  72. GRB 170228A: Fermi-LAT detection
  73. LIGO/Virgo G275697: Konus-Wind observations
  74. LIGO/Virgo G275697: Swift/BAT data search
  75. GRB 170222A: CALET Gamma-Ray Burst Monitor detection
  76. LIGO/Virgo G275404: Swift/BAT data search
  77. LIGO/Virgo G274296: Swift/BAT data search
  78. GRB 170220A: POLAR Observation
  79. Konus-Wind observation of GRB 170222A
  80. GRB 170222A: Swift-XRT observations
  81. GRB 170222A: Fermi GBM observation
  82. LIGO/Virgo G274296: HAWC follow-up
  83. GRB 170222A: Tiled Swift observations
  84. GRB 170222A: Swift ToO observations
  85. IPN Triangulation of GRB 170222A (short/hard)
  86. GRB 170219A: POLAR Observation
  87. Swift Trigger 739517 is probably not a GRB
  88. GRB 170219A: CALET Gamma-Ray Burst Monitor detection
  89. GRB 170219A: Fermi GBM observation
  90. Konus-Wind observation of GRB 170219A (short/hard)
  91. IPN Triangulation of GRB 170219A (short/hard)
  92. GRB 170214A: Swift-XRT afterglow detection
  93. GRB 170214A: Mondy optical upper limit
  94. GRB 170214A: VLT/X-shooter spectroscopy and tentative redshift
  95. GRB170214A: RATIR Optical and NIR Afterglow Confirmation
  96. GRB 170214A: GROND detection in all bands
  97. GRB 170214A: NOT optical afterglow confirmation
  98. GRB 170214A: Swift/UVOT Upper Limits
  99. GRB170214A: RATIR Optical and NIR Observations
  100. GRB 170209A: GROND confirmation of MASTER afterglow

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