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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"

41987 results found.

  1. GRB 160525A: Swift detection of a probable burst
  2. Correction - Fermi/GBM trigger 160523919 is a GRB
  3. GRB 160521B: Theoretical estimate of the redshift and urgent need for further x-ray observations
  4. GRB 160425A: SMARTS late-time observations
  5. GRB 160327A: 15 GHz upper limits from AMI
  6. GRB 160321A: 15 GHz upper limits from AMI
  7. GRB 160314A: 15 GHz upper limits from AMI
  8. GRB 160313A: 15 GHz upper limits from AMI
  9. GRB 160521B: Swift/UVOT Upper Limits
  10. GRB 160521B: Swift-XRT observations
  11. Another Swift detection of SGR 1935+2154 (trigger #687124)
  12. Swift detection of SGR 1935+2154
  13. GRB 160521B: Swift ToO observations
  14. GRB 160521B: Fermi-LAT detection
  15. GRB 160521B: Fermi GBM detection
  16. GRB 160521A: a long GRB detected by INTEGRAL
  17. GRB 160519A: Swift-BAT refined analysis
  18. Swift-BAT trigger 686845 was due to noise near a known source
  19. GRB 160519A: Fermi GBM detection
  20. Konus-Wind observation of a bright burst from SGR 1935+2154
  21. FERMI GBM bursts from the magnetar SGR 1935+2154
  22. GRB 160519A: Swift detection of a burst
  23. SGR 1935+2154: AbAO optical upper limit
  24. Fermi GBM triggers of SGR 1935+2154
  25. Trigger 686761: Swift detection of a bright burst from SGR 1935+2154
  26. Fermi GBM trigger 485205628 /160517806 is not a GRB
  27. Fermi GBM trigger 485124591/160516868 is not a GRB
  28. Trigger 686443: Swift detection of SGR 1935+2154
  29. Fermi GBM trigger 484906918/160514349 is not a GRB
  30. GRB 160509A: Further VLA Observations
  31. FACT follow-up of the IceCube event 160427A
  32. Interplanetary Network Search for IceCube 160427A
  33. GRB 160509A MASTER-NET observations
  34. GRB 160509A: CALET Gamma-Ray Burst Monitor detection
  35. GRB 160509A: non-observation of VHE emission with HAWC
  36. GRB 160508A: CALET Gamma-Ray Burst Monitor detection
  37. GRB 160509A: TLS Tautenburg Afterglow Detection
  38. GRB 160509A: Further Swift/UVOT Observations
  39. GRB 160509A Gemini North redshift
  40. Fermi GBM trigger 484574960/160510506 is not a GRB
  41. Konus-Wind observation of GRB 160509A
  42. GRB 160509A: DCT Imaging / Afterglow Confirmation
  43. GRB 160509A: MAXI/GSC refined analysis
  44. GRB 160509A: VLA Detection
  45. GRB 160509A: Fermi-LAT refined analysis
  46. GRB 160509A: Swift/UVOT Upper Limit
  47. GRB 160509A: Fermi GBM Detection
  48. GRB 160509A Gemini North candidate afterglow
  49. GRB 160509A: optical observations
  50. GRB 160509A: Swift-XRT afterglow detection
  51. GRB 160509A: Preliminary XRT positon
  52. GRB 160509A: Tiled Swift observations
  53. Correction to GCN 19404; GRB 160509A: MAXI/GSC detection
  54. GRB 160227A: MAXI/GSC detection
  55. GRB 160509A: Fermi-LAT prompt detection of a very bright burst
  56. GRB 160506A: TAROT La Silla observatory optical observations
  57. LIGO/Virgo G211117: Astrosat CZTI upper limits
  58. GRB 160506A: IRSF upper limits
  59. GRB 160506A: Swift-XRT refined Analysis
  60. GRB 160506A: Swift/UVOT Upper Limits
  61. GRB 160506A: Swift-BAT refined analysis
  62. GRB 160506A: GROND upper limits
  63. GRB 160506A: Swift detection of a burst
  64. GRB 160504A: Swift-BAT refined analysis
  65. IceCube-160427A: iPTF Observations
  66. GRB 160504A: RATIR Optical and NIR Observations
  67. GRB 160504A: Swift/UVOT Upper Limits
  68. GRB160504A: Gemini NIR Observations
  69. GRB 160504A: Bassano Bresciano Observatory upper limits
  70. GRB 160504A: Swift-XRT refined Analysis
  71. GRB 160504A: NOT upper limits
  72. GRB 160417A, the review of the sky area in plate archive
  73. GRB 160504A: TAROT Calern observatory optical observations
  74. GRB 160504A: Swift detection of a burst
  75. ICECUBE-160427A : Pan-STARRS imaging and optical transients in the field
  76. GRB 160503A: Fermi GBM observation
  77. GRB 160503A: Fermi-LAT detection
  78. GRB 160501A: SMARTS optical/IR observations
  79. VERITAS rapid follow-up observations of IceCube event 160427A
  80. GRB 160501A: Swift-BAT refined analysis
  81. GRB 160501A: GROND Upper limits
  82. GRB 160501A: MITSuME Okayama upper limits
  83. GRB 160501A: UKIRT near-IR upper limits
  84. GRB 160501A: Swift/UVOT Upper Limits
  85. GRB 160501A: Swift-XRT refined Analysis
  86. GRB 160501A: RATIR Optical and NIR Observations
  87. GRB 160501A: TAROT Calern observatory optical observations
  88. GRB 160501A MASTER-NET early observations
  89. GRB 160501A: NOT optical and NIR observations
  90. GRB 160501A: Swift detection of a burst
  91. IceCube-160427A: Fermi GBM Observations
  92. ICECUBE-160427A neutrino candidate event: updated direction information
  93. MASTER search for counterpart to the IceCube event 67093193 (run 127853)
  94. Archival observations by HAWC of IceCube HESE event of April 27, 2016
  95. Fermi/LAT search for counterpart to the IceCube event 67093193 (run 127853)
  96. GRB 160422A: XRT Afterglow Confirmation
  97. LSGT observation of GRB 160425A
  98. GRB 160425A: Swift/UVOT Detection
  99. GRB 160425A: Skynet PROMPT-CTIO observations of the optical afterglow
  100. GRB 160425A: Swift-BAT refined analysis

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