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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"

27938 results found.

  1. GRB 090807, Swift-BAT refined analysis
  2. GRB 090807: Enhanced Swift-XRT position
  3. GRB 090807, RIMOTS optical upper limits
  4. GRB 090807: Swift detection of a burst
  5. GRB 090802B: Fermi GBM detection
  6. GRB 090802: Fermi GBM detection
  7. GRB 090726: optical observation
  8. Swift-BAT trigger 358760 is most likely not a GRB
  9. Swift trigger 358760 is probably a noise event
  10. GRB 090709A : Quick look analysis of the Suzaku observation
  11. GRB 090728: Swift-BAT refined analysis
  12. GRB 090727: GRT Optical Observation
  13. GRB 090728: Swift XRT refined analysis
  14. GRB 090726: GRT Optical Observation
  15. GRB 090727: Swift/UVOT Upper Limits
  16. GRB 090728: Swift/UVOT Upper Limits
  17. GRB 090728: Enhanced Swift-XRT position
  18. GRB 090728, RIMOTS optical upper limits
  19. GRB 090728A: Faulkes Telescope North Optical Afterglow Candidate
  20. GRB 090728: Swift detection of a burst
  21. GRB 090727: Swift-BAT refined analysis
  22. GRB 090727: Swift-XRT refined analysis
  23. GRB 090727: Liverpool Telescope Afterglow Confirmation and Optical Flare
  24. GRB 090727: Enhanced Swift-XRT position
  25. GRB 090727: Liverpool Telescope possible OT candidate
  26. GRB 090727: Swift detection of a burst
  27. GRB090726: Swift/UVOT observations
  28. GRB 090726, Swift-BAT refined analysis
  29. GRB 090726: Afterglow candidate photometryfrom Crni Vrh
  30. GRB 090726: D50 optical observations
  31. GRB 090711: Fermi GBM detection
  32. GRB090726: 6-meter telescope redshift
  33. GRB 090726: Swift-XRT Team refined analysis
  34. GRB 090726: Enhanced Swift-XRT position
  35. GRB 090726: Swift/UVOT Finding Chart Observation
  36. GRB 090726: Swift-XRT position of probable counterpart
  37. GRB 090726: Swift detection of a burst
  38. Swift Trigger 358354 is not a GRB
  39. GRB 090720: Gemini-North Imaging and Optical Afterglow
  40. GRB 090720B: Fermi GBM detection
  41. Swift XRT and UVOT refned analysis of GRB 090720
  42. GRB 090709A: Swift XRT Timing Analysis
  43. GRB 090715B: VLA radio detection
  44. GRB 090720 Source found in ground processing of Swift-BAT data
  45. GRB 090717B: Fermi GBM detection
  46. GRB 090717: Fermi GBM detection
  47. GRB 090719: Fermi GBM detection
  48. GRB 090718B: Fermi GBM detection
  49. GRB 090718: Fermi GBM detection
  50. GRB 090720: Fermi GBM detection
  51. GRB 090715A: Suzaku WAM observation of the prompt emission
  52. GRB 090709A - CARMA mm Observations
  53. Konus-Wind observations of short/hard GRB 090715A
  54. GRB 090715B: MASTER optical limit
  55. GRB 090715A: Swift-BAT refined analysis
  56. GRB 090715B: Swift/UVOT followup observations
  57. GRB 090715B: break in the optical afterglow decay
  58. GRB 090715B: Enhanced Swift-XRT position
  59. GRB 090715B: Swift XRT Refined Analysis
  60. GRB 090715B: Swift-BAT refined analysis
  61. GRB 090715B - Liverpool Telescope Optical Afterglow Candidate
  62. Swift problem fixed
  63. GRB 090715B: Swift detection of a burst with a possible optical counterpart
  64. GRB 090715A: ROTSE-III Optical Limits
  65. GRB 090715: Swift detection of a short hard burst
  66. Detection of GRB 090618 by RT-2 Experiment onboard the CORONAS-PHOTON Satellite
  67. Swift satellite anomaly
  68. GRB 090712: Fermi GBM observation
  69. GRB 090713: Fermi GBM detection
  70. GRB 090712: Swift-BAT refined analysis
  71. GRB 090712: Swift detection of a burst
  72. GRB 090621B: MTM-500 optical observations
  73. GRB 090709A: deep optical observation with the 10.4m GTC
  74. GRB 090709A: Suzaku WAM observation of the prompt emission
  75. GRB 090709A: Swift UVOT upper limits
  76. GRB 090709B: Fermi GBM detection
  77. GRB 090709A: confirmation of the periodicity in the SPI-ACS data
  78. GRB 090709A: evidence for a very red afterglow at low z
  79. GRB 090709A: Quasiperiodic variations in the BAT light curve
  80. GRB 090709A: RAPTOR Limits During Gamma-Ray Emission
  81. GRB 090709A: Swift XRT Refined Analysis
  82. GRB 090709B, Swift-BAT refined analysis
  83. GRB 090709A: Swift-BAT refined analysis
  84. GRB090709A: High Energy BAT/XRT Analysis Suggests Low to Moderate Redshift
  85. GRB 090709A: Wyoming Infrared Observatory NIR upper limits
  86. GRB 090709A, RIMOTS optical upper limits
  87. GRB 090709A: Enhanced Swift-XRT position
  88. GRB 090709A - PAIRITEL Discovery of a Red Afterglow
  89. GRB 090709B: Swift detection of a burst
  90. GRB 090708 : Fermi GBM detection
  91. GRB 090709: Faulkes Telescope North Upper Limits
  92. GRB 090709: PAIRITEL NIR Upper Limits
  93. GRB 090709: ROTSE-III Optical Limits
  94. GRB 090709: Swift detection of a bright burst
  95. GRB 090708: Early RAPTOR Optical Limits
  96. GRB 090708, Swift-BAT refined analysis
  97. GRB 090708: ROTSE-III Optical Limits
  98. GRB 090708: Swift detection of a burst
  99. GRB 090706: Fermi GBM detection
  100. Swift-BAT trigger 356516 is not a GRB

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