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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"

37192 results found.

  1. GRB 090205: VLT refined redshift
  2. GRB 090205: Swift-XRT refined analysis
  3. GRB 090205: Swift burst of interest
  4. GRB 090205: VLT spectroscopic redshift
  5. GRB 090205: GROND observations and photometric redshift estimate
  6. GRB 090205: VLT candidate afterglow
  7. GRB 090205: Swift-BAT refined analysis
  8. GRB 090205: Enhanced Swift-XRT position
  9. GRB 090205: Swift detection of a burst
  10. GRB 080319B: IceCube upper limit on high-energy neutrino flux
  11. GRB 090131: Suzaku WAM observation of the prompt emission
  12. GRB 090126A: Swift-XRT afterglow confirmation
  13. Fermi Gamma-ray Burst Monitor trigger 255342766 is not a GRB
  14. Konus-Wind observation of GRB 090201
  15. GRB 090202: Fermi GBM detection
  16. GRB 090131: Fermi GBM detection
  17. GRB 090201: Swift-XRT refined analysis
  18. GRB090201: Swift UVOT upper limits
  19. GRB 090201: object inside the enhanced XRT error circle
  20. GRB 090201: Enhanced Swift-XRT position
  21. GRB 090201: VLT NIR observations
  22. GRB 090201: Swift-BAT refined analysis
  23. GRB 090201: VLT afterglow candidate
  24. GRB 090201: Swift-XRT detection of the possible X-ray afterglow
  25. GRB090113: MAGIC telescope GeV observation
  26. GRB 090201: ROTSE-III Optical Limits
  27. GRB 090201: Swift detection of a burst
  28. GRB 090126A: Swift/UVOT Upper Limits
  29. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  30. GRB 090129: Swift-BAT refined analysis
  31. GRB 090129: Swift detection of a burst
  32. IBAS Alert N. 5442 is not a GRB
  33. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  34. GRB 090102: HST observations and host galaxy
  35. GRB 090126C: Fermi GBM detection
  36. GRB 090126A: Swift-XRT Refined Analysis
  37. GRB 090126B: Fermi GBM detection
  38. GRB 090126: SuperAGILE Localization of a Long GRB
  39. GRB 090118: no afterglow candidate
  40. GRB 090123: GROND detection
  41. GRB 090123: Swift XRT refined analysis
  42. GRB 090123: Swift/UVOT Observations
  43. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  44. GRB 090123: Swift-BAT refined analysis
  45. GRB 090123: Swift detection of a burst
  46. AXP 1E1547.0-5408: long bursts with INTEGRAL SPI-ACS
  47. GRB 090118: Swift XRT Observations - Confirmation of an Afterglow
  48. Swift-BAT trigger 340734 is not a GRB
  49. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  50. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  51. GRB 090117C: Suzaku WAM observation of the prompt emission
  52. Trigger 340734: Swift detection of a possible short burst
  53. GRB 090118: Subaru NIR Observation
  54. GRB 090118: KPNO 4m 2nd Epoch Observations
  55. GRB 090118 (BATSS): GRT Optical Observation
  56. GRB 090118: KPNO 4m Detection of Candidate Afterglow
  57. GRB 090118: Swift-XRT observations
  58. GRB090118 Swift/UVOT upper limits
  59. GRB 090118: GROND Upper Limits
  60. GRB 090118: Possible burst detection from Swift-BAT slew data
  61. GRB 090117B : Fermi GBM detection
  62. GRB 090117: confirmation of the X-ray afterglow
  63. GRB 090117C - Fermi GRB Detection
  64. GRB 090117 - Fermi GBM Observations
  65. GRB 090117: GROND Upper Limits
  66. GRB090117 Swift/UVOT upper limits
  67. GRB090117: Swift-XRT detection of a possible candidate afterglow
  68. GRB 090117 - SuperAGILE Localization of a long GRB
  69. GRB 090112B: Suzaku WAM observation of the prompt emission
  70. GRB 090113: LOAO Detection Limits in R, I, z, Y-band
  71. GRB 090113: Swift UVOT upper limits
  72. GRB 090113: GROND Upper Limits
  73. GRB 090113: Swift-XRT refined analysis
  74. GRB 090113: Observations from NOT
  75. GRB 090113: Enhanced Swift-XRT position
  76. GRB 090113: Swift-BAT refined analysis
  77. GRB 090113: ROTSE-III Optical Limits
  78. GRB 090112B: Fermi GBM Detection
  79. GRB 090113: Swift detection of a burst
  80. GRB 090112: Fermi GBM detection
  81. GRB 090109: Fermi GBM detection
  82. GRB 090108B: Fermi GBM detection
  83. GRB 090111, Swift-BAT refined analysis
  84. GRB 090111: Swift UVOT Upper Limits
  85. GRB 090108: Fermi GBM Detection
  86. GRB 090111: Swift-XRT refined analysis
  87. GRB 090111: Enhanced Swift-XRT position
  88. GRB 090111: Swift detection of a burst
  89. GRB 090107B: Suzaku WAM observation of the prompt emission
  90. GRB090107B: Fermi GBM Detection
  91. GRB 090102: WSRT Radio Observations
  92. GRB 090107B: Swift XRT afterglow confirmation
  93. GRB 090107B: Swift/UVOT Observations
  94. GRB 090107B: Swift-XRT detection of possible afterglow
  95. GRB 090107B optical observations
  96. GRB 090107B: ROTSE-III Optical Limits
  97. GRB 090107B: a long GRB localized by INTEGRAL
  98. Fermi/GBM detection of GRB 081226A
  99. Fermi/GBM detection of GRB 081225
  100. GRB 090107: Swift-BAT refined analysis

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