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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"

19665 results found.

  1. GRB 090726: GRT Optical Observation
  2. GRB 090727: Swift/UVOT Upper Limits
  3. GRB 090728: Swift/UVOT Upper Limits
  4. GRB 090728: Enhanced Swift-XRT position
  5. GRB 090728, RIMOTS optical upper limits
  6. GRB 090728A: Faulkes Telescope North Optical Afterglow Candidate
  7. GRB 090728: Swift detection of a burst
  8. GRB 090727: Swift-BAT refined analysis
  9. GRB 090727: Swift-XRT refined analysis
  10. GRB 090727: Liverpool Telescope Afterglow Confirmation and Optical Flare
  11. GRB 090727: Enhanced Swift-XRT position
  12. GRB 090727: Liverpool Telescope possible OT candidate
  13. GRB 090727: Swift detection of a burst
  14. GRB090726: Swift/UVOT observations
  15. GRB 090726, Swift-BAT refined analysis
  16. GRB 090726: Afterglow candidate photometryfrom Crni Vrh
  17. GRB 090726: D50 optical observations
  18. GRB 090726: Swift-XRT Team refined analysis
  19. GRB 090726: Enhanced Swift-XRT position
  20. GRB 090726: Swift/UVOT Finding Chart Observation
  21. GRB 090726: Swift-XRT position of probable counterpart
  22. GRB 090726: Swift detection of a burst
  23. Swift Trigger 358354 is not a GRB
  24. GRB 090720: Gemini-North Imaging and Optical Afterglow
  25. Swift XRT and UVOT refned analysis of GRB 090720
  26. GRB 090709A: Swift XRT Timing Analysis
  27. GRB 090715B: VLA radio detection
  28. GRB 090720 Source found in ground processing of Swift-BAT data
  29. GRB 090715A: Suzaku WAM observation of the prompt emission
  30. GRB 090709A - CARMA mm Observations
  31. Konus-Wind observations of short/hard GRB 090715A
  32. GRB 090715B: MASTER optical limit
  33. GRB 090715A: Swift-BAT refined analysis
  34. GRB 090715B: Swift/UVOT followup observations
  35. GRB 090715B: break in the optical afterglow decay
  36. GRB 090715B: Enhanced Swift-XRT position
  37. GRB 090715B: Swift XRT Refined Analysis
  38. GRB 090715B: Swift-BAT refined analysis
  39. GRB 090715B - Liverpool Telescope Optical Afterglow Candidate
  40. Swift problem fixed
  41. GRB 090715B: Swift detection of a burst with a possible optical counterpart
  42. GRB 090715A: ROTSE-III Optical Limits
  43. GRB 090715: Swift detection of a short hard burst
  44. Swift satellite anomaly
  45. GRB 090712: Fermi GBM observation
  46. GRB 090712: Swift-BAT refined analysis
  47. GRB 090712: Swift detection of a burst
  48. GRB 090621B: MTM-500 optical observations
  49. GRB 090709A: deep optical observation with the 10.4m GTC
  50. GRB 090709A: Suzaku WAM observation of the prompt emission
  51. GRB 090709A: Swift UVOT upper limits
  52. GRB 090709B: Fermi GBM detection
  53. GRB 090709A: confirmation of the periodicity in the SPI-ACS data
  54. GRB 090709A: evidence for a very red afterglow at low z
  55. GRB 090709A: RAPTOR Limits During Gamma-Ray Emission
  56. GRB 090709A: Swift XRT Refined Analysis
  57. GRB 090709B, Swift-BAT refined analysis
  58. GRB 090709A: Swift-BAT refined analysis
  59. GRB090709A: High Energy BAT/XRT Analysis Suggests Low to Moderate Redshift
  60. GRB 090709A: Wyoming Infrared Observatory NIR upper limits
  61. GRB 090709A, RIMOTS optical upper limits
  62. GRB 090709A: Enhanced Swift-XRT position
  63. GRB 090709B: Swift detection of a burst
  64. GRB 090708 : Fermi GBM detection
  65. GRB 090709: Faulkes Telescope North Upper Limits
  66. GRB 090709: PAIRITEL NIR Upper Limits
  67. GRB 090709: ROTSE-III Optical Limits
  68. GRB 090709: Swift detection of a bright burst
  69. GRB 090708: Early RAPTOR Optical Limits
  70. GRB 090708, Swift-BAT refined analysis
  71. GRB 090708: ROTSE-III Optical Limits
  72. GRB 090708: Swift detection of a burst
  73. Swift-BAT trigger 356516 is not a GRB
  74. Possible GRB090705: Swift-XRT observations
  75. GRB 090705: PAIRITEL NIR Observations
  76. GRB 090705: Swift detection of a possible burst
  77. XRF 090702 : RTT150 optical observations
  78. GRB 090618: Mondy optical observations
  79. GRB 090529: CrAO optical upper limit
  80. GRB 090529: MTM-500 optical observations
  81. GRB 090529: Mt.Terskol optical observations
  82. XRF 090702: Swift-XRT refined analysis
  83. GRB 090702: UVOT upper limits
  84. XRF 090702: Swift-XRT afterglow position
  85. GRB 090628: Swift XRT refined analysis
  86. GRB 090618: RTT150 optical observations
  87. GRB 090628: Swift/UVOT Upper Limits
  88. GRB 090628: Swift-BAT refined analysis
  89. GRB 090628: GROND upper limits
  90. GRB 090628: Enhanced Swift-XRT position
  91. GRB 090626: IPN localization
  92. GRB 090628: Swift/UVOT Finding Chart Observation
  93. GRB 090628: Swift XRT position
  94. GRB 090628: Swift detection of a burst
  95. GRB 090625B: Swift/UVOT Upper Limits
  96. GRB 090625B: Swift-XRT refined analysis
  97. GRB 090625B: Swift observation of the INTEGRAL GRB 090625B
  98. GRB 090621A: Enhanced Swift-XRT position
  99. GRB 090621B: GRT Optical Observation
  100. GRB 090621A: GRT Optical Observation

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