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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"

19607 results found.

  1. GRB090201: Swift UVOT upper limits
  2. GRB 090201: Enhanced Swift-XRT position
  3. GRB 090201: Swift-BAT refined analysis
  4. GRB 090201: Swift-XRT detection of the possible X-ray afterglow
  5. GRB 090201: ROTSE-III Optical Limits
  6. GRB 090201: Swift detection of a burst
  7. GRB 090126A: Swift/UVOT Upper Limits
  8. GRB 090129: Swift-BAT refined analysis
  9. GRB 090129: Swift detection of a burst
  10. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  11. GRB 090126A: Swift-XRT Refined Analysis
  12. GRB 090123: GROND detection
  13. 1E1547.0-5408: Swift detection of dust halo
  14. GRB 090123: Swift XRT refined analysis
  15. GRB 090123: Swift/UVOT Observations
  16. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  17. GRB 090123: Swift-BAT refined analysis
  18. GRB090123: Enhanced Swift-XRT position
  19. GRB 090123: Swift detection of a burst
  20. GRB 090118: Swift XRT Observations - Confirmation of an Afterglow
  21. Swift-BAT trigger 340734 is not a GRB
  22. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  23. AXP 1E1547.0-5408: Fermi GBM observations
  24. Trigger 340734: Swift detection of a possible short burst
  25. AXP 1E1547.0-5408 activity with SGR bursts
  26. GRB 090118 (BATSS): GRT Optical Observation
  27. GRB 090118: Swift-XRT observations
  28. GRB090118 Swift/UVOT upper limits
  29. GRB 090118: GROND Upper Limits
  30. GRB 090118: Possible burst detection from Swift-BAT slew data
  31. GRB 090117: confirmation of the X-ray afterglow
  32. GRB 090117: GROND Upper Limits
  33. GRB090117 Swift/UVOT upper limits
  34. GRB090117: Swift-XRT detection of a possible candidate afterglow
  35. GRB 090113: Swift UVOT upper limits
  36. GRB 090113: GROND Upper Limits
  37. GRB 090113: Swift-XRT refined analysis
  38. GRB 090113: Enhanced Swift-XRT position
  39. GRB 090113: Swift-BAT refined analysis
  40. GRB 090113: ROTSE-III Optical Limits
  41. GRB090113: XRT position
  42. GRB 090113: Swift detection of a burst
  43. GRB 090111, Swift-BAT refined analysis
  44. GRB 090111: Swift UVOT Upper Limits
  45. GRB 090111: Swift-XRT refined analysis
  46. GRB 090111: Enhanced Swift-XRT position
  47. GRB 090111: Swift detection of a burst
  48. GRB 090107B: Swift XRT afterglow confirmation
  49. GRB 090107B: Swift/UVOT Observations
  50. GRB 090107B: Swift-XRT detection of possible afterglow
  51. Fermi/GBM detection of GRB 081226A
  52. GRB 090107: Swift-BAT refined analysis
  53. GRB 090107: Swift detection of a burst
  54. VLA radio upper limit on GRB 090102
  55. GRB 090102: GRT Optical Observation
  56. Swift triggered on the HMXB 1A 1118-61
  57. Konus-Wind observation of GRB 090102
  58. Swift UVOT observations of GRB 090102
  59. GRB 090102: Swift-BAT refined analysis
  60. GRB 090102: Swift burst of interest
  61. GRB 090102: Swift XRT refined analysis
  62. GRB 090102: Enhanced Swift-XRT position
  63. GRB 090102: TAROT Calern observatory optical light curve
  64. GRB 090102: Swift detection of a burst with an optical counterpart
  65. GRB 090102: TAROT Calern observatory optical observations
  66. GRB 081230: GROND confirmation of the afterglow
  67. GRB 081230, Swift-BAT refined analysis
  68. GRB081230: Swift-XRT refined analysis
  69. GRB 081230 Swift/UVOT Observations
  70. GRB 081230: Enhanced Swift-XRT position
  71. GRB 081230: Swift/UVOT Detection of an Optical Afterglow
  72. GRB 081230: ROTSE-III Detection of Optical Counterpart
  73. GRB 081230: Swift detection of a burst
  74. GRB 081228: GROND confirmation of the optical/NIR afterglow
  75. GRB 081228, Swift-BAT refined analysis
  76. GRB 081228: Swift/UVOT Upper Limits
  77. GRB 081228: Swift-XRT Team refined analysis
  78. GRB 081228: detection by GROND
  79. GRB 081228: Enhanced Swift-XRT position
  80. GRB 081228: TAROT Calern observatory optical observations
  81. GRB 081228: Swift detection of a burst
  82. GRB 081226B: Swift XRT and UVOT upper limits
  83. GRB 081226: Swift-XRT refined analysis
  84. GRB 081226A: Swift UVOT Upper Limits
  85. GRB 081226A: Swift-BAT refined analysis
  86. GRB 081226: ROTSE-III Optical Limits
  87. GRB 081226: Swift detection of a possible short-hard burst
  88. GRB 081224: Swift-XRT observation
  89. Konus-Wind observation of GRB 081222
  90. GRB 081221: GROND observations
  91. GRB 081222:Optical afterglow observation
  92. GRB 081222: Fermi GBM observation
  93. GRB081222: Swift/UVOT further observations
  94. GRB 081221: Probable host galaxy in Keck imaging
  95. GRB 081222, Swift-BAT refined analysis
  96. GRB 081221, Swift-BAT refined analysis
  97. GRB081222 optical limit by "Pi of the Sky"
  98. GRB 081222: Swift XRT refined analysis
  99. GRB081221: Fermi GBM observation
  100. Swift/UVOT observations of GRB 081221

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