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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"

37699 results found.

  1. GRB 170115B: AGILE detection
  2. GRB 170112A : AbAO optical observations
  3. GRB 170115A: Swift-BAT refined analysis
  4. GRB 170115A: Swift-XRT refined Analysis
  5. GRB 170114B: POLAR Observation
  6. GRB 170114A: POLAR Observation
  7. GRB 170115B: Tiled Swift observations
  8. GRB 170115B: AstroSat CZTI (Veto) detection
  9. GRB 170115A: Enhanced Swift-XRT position
  10. GRB 170115B: Fermi-LAT detection
  11. GRB 170115B: Fermi GBM detection
  12. GRB 170115A: Swift detection of a burst
  13. GRB 170114A: Fermi GBM detection
  14. GRB 170112B: POLAR observation
  15. GRB 170113A: VLT/X-shooter redshift
  16. GRB 170113A: GROND afterglow observations
  17. GRB 170113A: Swift-BAT refined analysis
  18. GRB 170113A: Swift/UVOT Observations
  19. GRB 170113A: Swift-XRT refined Analysis
  20. GRB 161214B: 15 GHz upper limits from AMI
  21. GRB 170113A: Fermi GBM observations
  22. GRB 170112A: Swift/UVOT Upper Limits
  23. GRB 170113A: Enhanced Swift-XRT position
  24. GRB 170101A: 15 GHz upper limits from AMI
  25. GRB 170113A: LCO Sutherland observations
  26. GRB 161217A: 15 GHz upper limits from AMI
  27. GRB 170113A: Swift detection of a burst with an optical counterpart
  28. GRB 170112A: RATIR Optical and NIR Observations
  29. GRB 170112A: Swift-BAT refined analysis
  30. GRB 161219B: afterglow and SN2016jca optical observations
  31. GRB 170111A: Swift/UVOT Upper Limits
  32. GRB 170112A: Swift-XRT observations
  33. GRB 170112A: MASTER-OAFA (Argentina) early optical observations
  34. GRB 170112A: REM optical/NIR observations
  35. GRB 170112A: Swift detection of a short burst
  36. GRB170111A: REM optical/NIR observations
  37. GRB 170111A: Swift-BAT refined analysis
  38. GRB 170111A: SMARTS optical/IR observations
  39. GRB 170111A: Swift-XRT refined Analysis
  40. GRB 161230A: POLAR Observation
  41. GRB 170111A: MASTER-OAFA (Argentina) prompt OT observations
  42. LIGO/Virgo G268556: AMI 15 GHz detection of ATLAS17aeu
  43. GRB 170111A: Enhanced Swift-XRT position
  44. GRB 170111A: Swift detection of a burst
  45. LIGO/Virgo G268556: Swift/BAT data search
  46. LIGO/Virgo G268556: Lijiang Observatory GMG Telescope Upper Limit on ATLAS17aeu
  47. GRB 170109A: POLAR Observation
  48. LIGO/Virgo G268556: NOWT of EWE, Xinglong 0.6/0.9m, Xuyi 1m optical upper limits of ATLAS17aeu and a reminder of GCN 20394
  49. LIGO/Virgo G268556: Swift-XRT confirms that ATLAS17aeu is fading in X-rays
  50. LIGO/Virgo G268556: ATLAS17aeu position is consistent with GRB170105A
  51. GRB170105A: AstroSat CZTI localisation
  52. LIGO/Virgo G268556: Gemini spectrum and Pan-STARRS observations of ATLAS17aeu
  53. LIGO/Virgo G268556: IPN Triangulation of GRB 170105A (association with ATLAS17aeu)
  54. LIGO/Virgo G268556/GW170104: Lomonosov BDRG observations
  55. LIGO/Virgo G268556: VLA follow-up of ATLAS17aeu
  56. LIGO/Virgo G268556: Palomar 200-inch detects ATLAS17aeu, possible afterglow of GRB070105A?
  57. GRB 170105A: AstroSat CZTI detection
  58. GRB 170105A: POLAR Observation
  59. LIGO/Virgo G268556: HAWC follow-up of northern sky
  60. PESSTO follow-up of GRB 161219B/SN2016jca
  61. LIGO/Virgo G268556: DESGW/DECam observations
  62. LIGO/Virgo G268556: Fermi-LAT search for high-energy gamma-ray counterpart
  63. GRB 170102A: Astrosat CZTI detection
  64. LIGO/Virgo G268556: Fermi GBM Observations
  65. GRB 170102A: POLAR observation
  66. Konus-Wind observation of GRB 170101A
  67. GRB 170101B: POLAR observation
  68. GRB 170101B: Lomonosov BDRG gamma ray discovery
  69. GRB 170101A: Lomonosov BDRG gamma ray discovery
  70. Swift trigger 729600 is not an astrophysical event
  71. GRB 161228C: POLAR observation
  72. GRB 170101A: POLAR observation
  73. GRB 161229A: POLAR observation
  74. GRB 170101A: Swift-BAT refined analysis
  75. GRB 170101B: Astrosat CZTI detection
  76. GRB 170101B: Fermi GBM detection
  77. GRB 170101A: Swift detection of a burst
  78. GRB 161228B: POLAR Observation
  79. GRB 161228A: POLAR Observation
  80. GRB161219B - Anticipated hyperluminal evidence
  81. GRB 161214B: MASTER-Kislovodsk early optical observations
  82. GMRT radio detection of GRB 161219B
  83. GRB 161214A: MASTER-IAC early optical observations
  84. GRB 161219B: Spectroscopic detection of the associated SN with OSIRIS/GTC
  85. Fermi GBM trigger 504490076/161227005 is not a GRB
  86. GRB 161224A: TSHAO optical observations
  87. GRB 161224A: Swift/UVOT Upper limits
  88. GRB 161224A: Swift-XRT refined Analysis
  89. GRB 161224A: Swift-BAT refined analysis
  90. Swift Trigger 728268: a possible GRB
  91. Fermi GBM trigger 504233075/161224301 is not a GRB
  92. Swift Trigger 728094: a possible GRB
  93. GRB 161219B: UKIRT near-IR afterglow detection
  94. GRB 161219B: POLAR Observation
  95. GRB161219.78 MASTER-Net OT detection
  96. Fermi GBM trigger 504061556/161222046 is not a GRB
  97. GRB 161219B: Rapid ALMA Observations & Detection
  98. Correction to GCN 20323 "Konus-Wind observation of GRB 161219B"
  99. Fermi GBM trigger 504043585/161221838 is not a GRB
  100. GRB 161220A: Swift-BAT refined analysis

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