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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"

36310 results found.

  1. GRB 090301A: Swift-BAT refined analysis
  2. GRB 090301B: Fermi GBM detection
  3. GRB 090227B: Fermi GBM detection
  4. GRB 090301: Swift detection of a burst
  5. Swift_BAT_Lightcurve Notice for Trigger Number 344565 is not valid
  6. GRB 090228: Fermi GBM detection
  7. GRB 090227: Fermi GBM detection
  8. GRB 090206: Fermi GBM detection
  9. GRB 081211B: Nearby cluster
  10. GRB 090222: Fermi GBM detection
  11. GRB 090219: Fermi GBM detection
  12. Swift Trigger 343319 is not a GRB
  13. GRB 090217: Suzaku WAM observation of the prompt emission
  14. GRB090217: XRT analysis
  15. Konus-Wind observation of GRB 090217
  16. IPN localization of GRB 090217
  17. GRB 090213: Fermi GBM detection
  18. GRB090217: Fermi-LAT Detection
  19. GRB 090217: Fermi GBM detection
  20. GRB 090207 - Fermi GBM Observations
  21. Fermi Gamma-ray Burst Monitor trigger 255729682 is not a GRB
  22. GRB 090129: Fermi GBM detection
  23. VLA radio upper limit on GRB 090205
  24. GRB 090205: VLT optical decay
  25. Fermi Gamma-ray Burst Monitor trigger 255541748 cannot be classified
  26. GRB 090205: Swift/UVOT Upper Limits
  27. GRB 090205: VLT refined redshift
  28. GRB 090205: Swift-XRT refined analysis
  29. GRB 090205: Swift burst of interest
  30. GRB 090205: VLT spectroscopic redshift
  31. GRB 090205: GROND observations and photometric redshift estimate
  32. GRB 090205: VLT candidate afterglow
  33. GRB 090205: Swift-BAT refined analysis
  34. GRB 090205: Enhanced Swift-XRT position
  35. GRB 090205: Swift detection of a burst
  36. GRB 080319B: IceCube upper limit on high-energy neutrino flux
  37. GRB 090131: Suzaku WAM observation of the prompt emission
  38. GRB 090126A: Swift-XRT afterglow confirmation
  39. Fermi Gamma-ray Burst Monitor trigger 255342766 is not a GRB
  40. Konus-Wind observation of GRB 090201
  41. GRB 090202: Fermi GBM detection
  42. GRB 090131: Fermi GBM detection
  43. GRB 090201: Swift-XRT refined analysis
  44. GRB090201: Swift UVOT upper limits
  45. GRB 090201: object inside the enhanced XRT error circle
  46. GRB 090201: Enhanced Swift-XRT position
  47. GRB 090201: VLT NIR observations
  48. GRB 090201: Swift-BAT refined analysis
  49. GRB 090201: VLT afterglow candidate
  50. GRB 090201: Swift-XRT detection of the possible X-ray afterglow
  51. GRB090113: MAGIC telescope GeV observation
  52. GRB 090201: ROTSE-III Optical Limits
  53. GRB 090201: Swift detection of a burst
  54. GRB 090126A: Swift/UVOT Upper Limits
  55. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  56. GRB 090129: Swift-BAT refined analysis
  57. GRB 090129: Swift detection of a burst
  58. IBAS Alert N. 5442 is not a GRB
  59. GRB 090102: HST observations and host galaxy
  60. GRB 090126C: Fermi GBM detection
  61. GRB 090126A: Swift-XRT Refined Analysis
  62. GRB 090126B: Fermi GBM detection
  63. GRB 090126: SuperAGILE Localization of a Long GRB
  64. GRB 090118: no afterglow candidate
  65. GRB 090123: GROND detection
  66. GRB 090123: Swift XRT refined analysis
  67. GRB 090123: Swift/UVOT Observations
  68. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  69. GRB 090123: Swift-BAT refined analysis
  70. GRB 090123: Swift detection of a burst
  71. AXP 1E1547.0-5408: long bursts with INTEGRAL SPI-ACS
  72. GRB 090118: Swift XRT Observations - Confirmation of an Afterglow
  73. Swift-BAT trigger 340734 is not a GRB
  74. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  75. GRB 090117C: Suzaku WAM observation of the prompt emission
  76. Trigger 340734: Swift detection of a possible short burst
  77. GRB 090118: Subaru NIR Observation
  78. GRB 090118: KPNO 4m 2nd Epoch Observations
  79. GRB 090118 (BATSS): GRT Optical Observation
  80. GRB 090118: KPNO 4m Detection of Candidate Afterglow
  81. GRB 090118: Swift-XRT observations
  82. GRB090118 Swift/UVOT upper limits
  83. GRB 090118: GROND Upper Limits
  84. GRB 090118: Possible burst detection from Swift-BAT slew data
  85. GRB 090117B : Fermi GBM detection
  86. GRB 090117: confirmation of the X-ray afterglow
  87. GRB 090117C - Fermi GRB Detection
  88. GRB 090117 - Fermi GBM Observations
  89. GRB 090117: GROND Upper Limits
  90. GRB090117 Swift/UVOT upper limits
  91. GRB090117: Swift-XRT detection of a possible candidate afterglow
  92. GRB 090117 - SuperAGILE Localization of a long GRB
  93. GRB 090112B: Suzaku WAM observation of the prompt emission
  94. GRB 090113: LOAO Detection Limits in R, I, z, Y-band
  95. GRB 090113: Swift UVOT upper limits
  96. GRB 090113: GROND Upper Limits
  97. GRB 090113: Swift-XRT refined analysis
  98. GRB 090113: Observations from NOT
  99. GRB 090113: Enhanced Swift-XRT position
  100. GRB 090113: Swift-BAT refined analysis

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