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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"

27831 results found.

  1. Swift-BAT trigger 358760 is most likely not a GRB
  2. Swift trigger 358760 is probably a noise event
  3. GRB 090709A : Quick look analysis of the Suzaku observation
  4. GRB 090728: Swift-BAT refined analysis
  5. GRB 090727: GRT Optical Observation
  6. GRB 090728: Swift XRT refined analysis
  7. GRB 090726: GRT Optical Observation
  8. GRB 090727: Swift/UVOT Upper Limits
  9. GRB 090728: Swift/UVOT Upper Limits
  10. GRB 090728: Enhanced Swift-XRT position
  11. GRB 090728, RIMOTS optical upper limits
  12. GRB 090728A: Faulkes Telescope North Optical Afterglow Candidate
  13. GRB 090728: Swift detection of a burst
  14. GRB 090727: Swift-BAT refined analysis
  15. GRB 090727: Swift-XRT refined analysis
  16. GRB 090727: Liverpool Telescope Afterglow Confirmation and Optical Flare
  17. GRB 090727: Enhanced Swift-XRT position
  18. GRB 090727: Liverpool Telescope possible OT candidate
  19. GRB 090727: Swift detection of a burst
  20. GRB090726: Swift/UVOT observations
  21. GRB 090726, Swift-BAT refined analysis
  22. GRB 090726: Afterglow candidate photometryfrom Crni Vrh
  23. GRB 090726: D50 optical observations
  24. GRB 090711: Fermi GBM detection
  25. GRB090726: 6-meter telescope redshift
  26. GRB 090726: Swift-XRT Team refined analysis
  27. GRB 090726: Enhanced Swift-XRT position
  28. GRB 090726: Swift/UVOT Finding Chart Observation
  29. GRB 090726: Swift-XRT position of probable counterpart
  30. GRB 090726: Swift detection of a burst
  31. Swift Trigger 358354 is not a GRB
  32. GRB 090720: Gemini-North Imaging and Optical Afterglow
  33. GRB 090720B: Fermi GBM detection
  34. Swift XRT and UVOT refned analysis of GRB 090720
  35. GRB 090709A: Swift XRT Timing Analysis
  36. GRB 090715B: VLA radio detection
  37. GRB 090720 Source found in ground processing of Swift-BAT data
  38. GRB 090717B: Fermi GBM detection
  39. GRB 090717: Fermi GBM detection
  40. GRB 090719: Fermi GBM detection
  41. GRB 090718B: Fermi GBM detection
  42. GRB 090718: Fermi GBM detection
  43. GRB 090720: Fermi GBM detection
  44. GRB 090715A: Suzaku WAM observation of the prompt emission
  45. GRB 090709A - CARMA mm Observations
  46. Konus-Wind observations of short/hard GRB 090715A
  47. GRB 090715B: MASTER optical limit
  48. GRB 090715A: Swift-BAT refined analysis
  49. GRB 090715B: Swift/UVOT followup observations
  50. GRB 090715B: break in the optical afterglow decay
  51. GRB 090715B: Enhanced Swift-XRT position
  52. GRB 090715B: Swift XRT Refined Analysis
  53. GRB 090715B: Swift-BAT refined analysis
  54. GRB 090715B - Liverpool Telescope Optical Afterglow Candidate
  55. Swift problem fixed
  56. GRB 090715B: Swift detection of a burst with a possible optical counterpart
  57. GRB 090715A: ROTSE-III Optical Limits
  58. GRB 090715: Swift detection of a short hard burst
  59. Detection of GRB 090618 by RT-2 Experiment onboard the CORONAS-PHOTON Satellite
  60. Swift satellite anomaly
  61. GRB 090712: Fermi GBM observation
  62. GRB 090713: Fermi GBM detection
  63. GRB 090712: Swift-BAT refined analysis
  64. GRB 090712: Swift detection of a burst
  65. GRB 090621B: MTM-500 optical observations
  66. GRB 090709A: deep optical observation with the 10.4m GTC
  67. GRB 090709A: Suzaku WAM observation of the prompt emission
  68. GRB 090709A: Swift UVOT upper limits
  69. GRB 090709B: Fermi GBM detection
  70. GRB 090709A: confirmation of the periodicity in the SPI-ACS data
  71. GRB 090709A: evidence for a very red afterglow at low z
  72. GRB 090709A: Quasiperiodic variations in the BAT light curve
  73. GRB 090709A: RAPTOR Limits During Gamma-Ray Emission
  74. GRB 090709A: Swift XRT Refined Analysis
  75. GRB 090709B, Swift-BAT refined analysis
  76. GRB 090709A: Swift-BAT refined analysis
  77. GRB090709A: High Energy BAT/XRT Analysis Suggests Low to Moderate Redshift
  78. GRB 090709A: Wyoming Infrared Observatory NIR upper limits
  79. GRB 090709A, RIMOTS optical upper limits
  80. GRB 090709A: Enhanced Swift-XRT position
  81. GRB 090709A - PAIRITEL Discovery of a Red Afterglow
  82. GRB 090709B: Swift detection of a burst
  83. GRB 090708 : Fermi GBM detection
  84. GRB 090709: Faulkes Telescope North Upper Limits
  85. GRB 090709: PAIRITEL NIR Upper Limits
  86. GRB 090709: ROTSE-III Optical Limits
  87. GRB 090709: Swift detection of a bright burst
  88. GRB 090708: Early RAPTOR Optical Limits
  89. GRB 090708, Swift-BAT refined analysis
  90. GRB 090708: ROTSE-III Optical Limits
  91. GRB 090708: Swift detection of a burst
  92. GRB 090706: Fermi GBM detection
  93. Swift-BAT trigger 356516 is not a GRB
  94. Possible GRB090705: Swift-XRT observations
  95. GRB 090705: PAIRITEL NIR Observations
  96. GRB 090705: Swift detection of a possible burst
  97. XRF 090702 : RTT150 optical observations
  98. GRB 090618: Mondy optical observations
  99. GRB 090529: CrAO optical upper limit
  100. GRB 090529: MTM-500 optical observations

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