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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 090217: Fermi GBM detection
  2. SGR activity seen by BAT during ICSP Ionospheric Events
  3. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  4. GRB 090207 - Fermi GBM Observations
  5. Fermi Gamma-ray Burst Monitor trigger 255729682 is not a GRB
  6. GRB 090129: Fermi GBM detection
  7. VLA radio upper limit on GRB 090205
  8. GRB 090205: VLT optical decay
  9. Fermi Gamma-ray Burst Monitor trigger 255541748 cannot be classified
  10. GRB 090205: Swift/UVOT Upper Limits
  11. GRB 090205: VLT refined redshift
  12. GRB 090205: Swift-XRT refined analysis
  13. GRB 090205: Swift burst of interest
  14. GRB 090205: VLT spectroscopic redshift
  15. GRB 090205: GROND observations and photometric redshift estimate
  16. GRB 090205: VLT candidate afterglow
  17. GRB 090205: Swift-BAT refined analysis
  18. GRB 090205: Enhanced Swift-XRT position
  19. GRB 090205: Swift detection of a burst
  20. GRB 080319B: IceCube upper limit on high-energy neutrino flux
  21. GRB 090131: Suzaku WAM observation of the prompt emission
  22. GRB 090126A: Swift-XRT afterglow confirmation
  23. Fermi Gamma-ray Burst Monitor trigger 255342766 is not a GRB
  24. Konus-Wind observation of GRB 090201
  25. GRB 090202: Fermi GBM detection
  26. GRB 090131: Fermi GBM detection
  27. GRB 090201: Swift-XRT refined analysis
  28. GRB090201: Swift UVOT upper limits
  29. GRB 090201: object inside the enhanced XRT error circle
  30. GRB 090201: Enhanced Swift-XRT position
  31. GRB 090201: VLT NIR observations
  32. GRB 090201: Swift-BAT refined analysis
  33. GRB 090201: VLT afterglow candidate
  34. GRB 090201: Swift-XRT detection of the possible X-ray afterglow
  35. GRB090113: MAGIC telescope GeV observation
  36. GRB 090201: ROTSE-III Optical Limits
  37. GRB 090201: Swift detection of a burst
  38. GRB 090126A: Swift/UVOT Upper Limits
  39. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  40. GRB 090129: Swift-BAT refined analysis
  41. GRB 090129: Swift detection of a burst
  42. IBAS Alert N. 5442 is not a GRB
  43. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  44. GRB 090102: HST observations and host galaxy
  45. GRB 090126C: Fermi GBM detection
  46. GRB 090126A: Swift-XRT Refined Analysis
  47. GRB 090126B: Fermi GBM detection
  48. GRB 090126: SuperAGILE Localization of a Long GRB
  49. GRB 090118: no afterglow candidate
  50. GRB 090123: GROND detection
  51. GRB 090123: Swift XRT refined analysis
  52. GRB 090123: Swift/UVOT Observations
  53. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  54. GRB 090123: Swift-BAT refined analysis
  55. GRB 090123: Swift detection of a burst
  56. AXP 1E1547.0-5408: long bursts with INTEGRAL SPI-ACS
  57. GRB 090118: Swift XRT Observations - Confirmation of an Afterglow
  58. Swift-BAT trigger 340734 is not a GRB
  59. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  60. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  61. GRB 090117C: Suzaku WAM observation of the prompt emission
  62. AXP 1E1547.0-5408: Fermi GBM observations
  63. Trigger 340734: Swift detection of a possible short burst
  64. AXP 1E1547.0-5408 activity with SGR bursts
  65. GRB 090118: Subaru NIR Observation
  66. GRB 090118: KPNO 4m 2nd Epoch Observations
  67. GRB 090118 (BATSS): GRT Optical Observation
  68. GRB 090118: KPNO 4m Detection of Candidate Afterglow
  69. GRB 090118: Swift-XRT observations
  70. GRB090118 Swift/UVOT upper limits
  71. GRB 090118: GROND Upper Limits
  72. GRB 090118: Possible burst detection from Swift-BAT slew data
  73. GRB 090117B : Fermi GBM detection
  74. GRB 090117: confirmation of the X-ray afterglow
  75. GRB 090117C - Fermi GRB Detection
  76. GRB 090117 - Fermi GBM Observations
  77. GRB 090117: GROND Upper Limits
  78. GRB090117 Swift/UVOT upper limits
  79. GRB090117: Swift-XRT detection of a possible candidate afterglow
  80. GRB 090117 - SuperAGILE Localization of a long GRB
  81. GRB 090112B: Suzaku WAM observation of the prompt emission
  82. GRB 090113: LOAO Detection Limits in R, I, z, Y-band
  83. GRB 090113: Swift UVOT upper limits
  84. GRB 090113: GROND Upper Limits
  85. GRB 090113: Swift-XRT refined analysis
  86. GRB 090113: Observations from NOT
  87. GRB 090113: Enhanced Swift-XRT position
  88. GRB 090113: Swift-BAT refined analysis
  89. GRB 090113: ROTSE-III Optical Limits
  90. GRB 090112B: Fermi GBM Detection
  91. GRB 090113: Swift detection of a burst
  92. GRB 090112: Fermi GBM detection
  93. GRB 090109: Fermi GBM detection
  94. GRB 090108B: Fermi GBM detection
  95. GRB 090111, Swift-BAT refined analysis
  96. GRB 090111: Swift UVOT Upper Limits
  97. GRB 090108: Fermi GBM Detection
  98. GRB 090111: Swift-XRT refined analysis
  99. GRB 090111: Enhanced Swift-XRT position
  100. GRB 090111: Swift detection of a burst

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