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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"

36197 results found.

  1. GRB 170115B: CALET Gamma-Ray Burst Monitor detection
  2. GRB 170117A: Swift-XRT observations
  3. GRB 170117A: Swift ToO observations
  4. Swift Trigger #733426: possible detection of a burst or transient
  5. GRB 170115A : AbAO optical upper limit
  6. GRB 170115A: Swift/UVOT Upper Limits
  7. GRB 170115B: Swift-XRT observations
  8. Konus-Wind observation of GRB 170115B
  9. IPN Triangulation of GRB 170115B
  10. GRB 170115B: AGILE detection
  11. GRB 170112A : AbAO optical observations
  12. GRB 170115A: Swift-BAT refined analysis
  13. GRB 170115A: Swift-XRT refined Analysis
  14. GRB 170114B: POLAR Observation
  15. GRB 170114A: POLAR Observation
  16. GRB 170115B: Tiled Swift observations
  17. GRB 170115B: AstroSat CZTI (Veto) detection
  18. GRB 170115A: Enhanced Swift-XRT position
  19. GRB 170115B: Fermi-LAT detection
  20. GRB 170115B: Fermi GBM detection
  21. GRB 170115A: Swift detection of a burst
  22. GRB 170114A: Fermi GBM detection
  23. GRB 170112B: POLAR observation
  24. GRB 170113A: VLT/X-shooter redshift
  25. GRB 170113A: GROND afterglow observations
  26. GRB 170113A: Swift-BAT refined analysis
  27. GRB 170113A: Swift/UVOT Observations
  28. GRB 170113A: Swift-XRT refined Analysis
  29. GRB 161214B: 15 GHz upper limits from AMI
  30. GRB 170113A: Fermi GBM observations
  31. GRB 170112A: Swift/UVOT Upper Limits
  32. GRB 170113A: Enhanced Swift-XRT position
  33. GRB 170101A: 15 GHz upper limits from AMI
  34. GRB 170113A: LCO Sutherland observations
  35. GRB 161217A: 15 GHz upper limits from AMI
  36. GRB 170113A: Swift detection of a burst with an optical counterpart
  37. GRB 170112A: RATIR Optical and NIR Observations
  38. GRB 170112A: Swift-BAT refined analysis
  39. GRB 161219B: afterglow and SN2016jca optical observations
  40. GRB 170111A: Swift/UVOT Upper Limits
  41. GRB 170112A: Swift-XRT observations
  42. GRB 170112A: MASTER-OAFA (Argentina) early optical observations
  43. GRB 170112A: REM optical/NIR observations
  44. GRB 170112A: Swift detection of a short burst
  45. GRB170111A: REM optical/NIR observations
  46. GRB 170111A: Swift-BAT refined analysis
  47. GRB 170111A: SMARTS optical/IR observations
  48. GRB 170111A: Swift-XRT refined Analysis
  49. GRB 161230A: POLAR Observation
  50. GRB 170111A: MASTER-OAFA (Argentina) prompt OT observations
  51. LIGO/Virgo G268556: AMI 15 GHz detection of ATLAS17aeu
  52. GRB 170111A: Enhanced Swift-XRT position
  53. GRB 170111A: Swift detection of a burst
  54. LIGO/Virgo G268556: Swift/BAT data search
  55. LIGO/Virgo G268556: Lijiang Observatory GMG Telescope Upper Limit on ATLAS17aeu
  56. GRB 170109A: POLAR Observation
  57. LIGO/Virgo G268556: NOWT of EWE, Xinglong 0.6/0.9m, Xuyi 1m optical upper limits of ATLAS17aeu and a reminder of GCN 20394
  58. LIGO/Virgo G268556: Swift-XRT confirms that ATLAS17aeu is fading in X-rays
  59. LIGO/Virgo G268556: ATLAS17aeu position is consistent with GRB170105A
  60. GRB170105A: AstroSat CZTI localisation
  61. LIGO/Virgo G268556: Gemini spectrum and Pan-STARRS observations of ATLAS17aeu
  62. LIGO/Virgo G268556: IPN Triangulation of GRB 170105A (association with ATLAS17aeu)
  63. LIGO/Virgo G268556/GW170104: Lomonosov BDRG observations
  64. LIGO/Virgo G268556: VLA follow-up of ATLAS17aeu
  65. LIGO/Virgo G268556: Palomar 200-inch detects ATLAS17aeu, possible afterglow of GRB070105A?
  66. GRB 170105A: AstroSat CZTI detection
  67. GRB 170105A: POLAR Observation
  68. LIGO/Virgo G268556: HAWC follow-up of northern sky
  69. PESSTO follow-up of GRB 161219B/SN2016jca
  70. GRB 170102A: Astrosat CZTI detection
  71. GRB 170102A: POLAR observation
  72. Konus-Wind observation of GRB 170101A
  73. GRB 170101B: POLAR observation
  74. GRB 170101B: Lomonosov BDRG gamma ray discovery
  75. GRB 170101A: Lomonosov BDRG gamma ray discovery
  76. Swift trigger 729600 is not an astrophysical event
  77. GRB 161228C: POLAR observation
  78. GRB 170101A: POLAR observation
  79. GRB 161229A: POLAR observation
  80. GRB 170101A: Swift-BAT refined analysis
  81. GRB 170101B: Astrosat CZTI detection
  82. GRB 170101B: Fermi GBM detection
  83. GRB 170101A: Swift detection of a burst
  84. GRB 161228B: POLAR Observation
  85. GRB 161228A: POLAR Observation
  86. GRB161219B - Anticipated hyperluminal evidence
  87. GRB 161214B: MASTER-Kislovodsk early optical observations
  88. GMRT radio detection of GRB 161219B
  89. GRB 161214A: MASTER-IAC early optical observations
  90. GRB 161219B: Spectroscopic detection of the associated SN with OSIRIS/GTC
  91. Fermi GBM trigger 504490076/161227005 is not a GRB
  92. GRB 161224A: TSHAO optical observations
  93. GRB 161224A: Swift/UVOT Upper limits
  94. GRB 161224A: Swift-XRT refined Analysis
  95. GRB 161224A: Swift-BAT refined analysis
  96. Swift Trigger 728268: a possible GRB
  97. Fermi GBM trigger 504233075/161224301 is not a GRB
  98. Swift Trigger 728094: a possible GRB
  99. GRB 161219B: UKIRT near-IR afterglow detection
  100. GRB 161219B: POLAR Observation

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