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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"

19670 results found.

  1. GRB 121123A: Fermi GBM observation
  2. GRB 121123A: MASTER-NET optical limit
  3. GRB 121123A: Swift detection of a burst with optical counterpart
  4. GRB 121108A: optical upper limit
  5. IPN Triangulation of GRB 121118B (long/intense)
  6. GRB 121117A: GROND confirmation of the UVOT afterglow candidate
  7. Swift-BAT trigger 538575 is not astrophysical
  8. GRB 121117A: Swift/UVOT Observations
  9. GRB 121117A: Swift-XRT refined Analysis
  10. GRB 121117A: MASTER prompt optical limit
  11. GRB 121117A, Swift-BAT refined analysis
  12. GRB 121117A: ROTSE-III Optical Limits
  13. GRB 121117A: BOOTES-3 early optical upper limit
  14. GRB 121117A: Swift detection of a burst
  15. Swift trigger 538575: Magellan Observations
  16. Trigger 538084: Swift detection of XTE J1739-302
  17. GRB 121108A: Swift-XRT refined Analysis
  18. GRB 121108A: Swift/UVOT Upper Limits
  19. GRB 121108A, Swift-BAT refined analysis
  20. GRB 121108A: Enhanced Swift-XRT position
  21. GRB 121108A: Optical observations
  22. GRB 121108A: MASTER early prompt optical limit
  23. GRB 121108A: TAROT Calern observatory optical observations
  24. GRB 121108A: Swift detection of a burst
  25. GRB 121031A: Fermi GBM detection
  26. GRB 121028A: Swift/UVOT Upper Limits
  27. GRB 121031A, Early peak observed with Swift-BAT
  28. GRB 121102A: Swift/UVOT Upper Limits
  29. GRB 121031A: Swift/UVOT Upper Limits
  30. GRB 121031A: Swift-XRT refined Analysis
  31. GRB 121102A: Enhanced Swift-XRT position
  32. GRB 121031A: Enhanced Swift-XRT position
  33. GRB 121102A: Swift-XRT refined Analysis
  34. GRB 121102A: Swift-BAT refined analysis
  35. GRB 121025A: Confirmation of the X-ray afterglow
  36. GRB 121102A: Swift detection of a burst
  37. GRB 121027A: sub-mm upper limit
  38. GRB 121031A: Swift-BAT refined analysis
  39. GRB 121031A: Prompt enhanced Swift-XRT position
  40. GRB 121031A: Swift detection of a burst
  41. Swift Quick-look and HEASARC are back online
  42. GRB 121027A: Swift/UVOT Possible Detection
  43. GRB 121028A: near-IR observations at Calar Alto
  44. GRB 121028A: RAPTOR Limits During Gamma-Ray Emitting Interval
  45. Swift Quick-look and HEASARC will be offline for due to hurricane Sandy
  46. GRB 121027A: MASTER early prompt optical limit
  47. GRB 121027A: Swift-XRT refined Analysis
  48. GRB 121027A: Brightening IR counterpart
  49. GRB 121028A: Swift-XRT refined Analysis
  50. GRB 121028A: Enhanced Swift-XRT position
  51. GRB 121028A: Swift-BAT refined analysis
  52. GRB 121027A: Enhanced Swift-XRT position
  53. GRB 121028A: Swift detection of a burst
  54. GRB 121011A: optical observations
  55. GRB 121027A: nIR afterglow candidate with AAT
  56. GRB 121027A: Swift-BAT refined analysis
  57. GRB 121025A: Swift-XRT observation
  58. GRB 121027A: MAXI/GSC detection 40 minutes after the Swift Trigger
  59. GRB 121027A: Swift detection of a burst
  60. Swift Quick-look and HEASARC will be offline for 24 hours this weekend
  61. Swift-BAT trigger 536502 is not astrophysical
  62. GRB 121024A: Swift/UVOT Observations
  63. GRB 121024A: Swift-BAT refined analysis
  64. GRB 121024A: Enhanced Swift-XRT position
  65. GRB 121024A: PAIRITEL NIR Detection
  66. GRB 121024A: Swift-XRT refined Analysis
  67. GRB 121024A: GROND Detection of the Optical/NIR Afterglow
  68. Skynet PROMPT/Dolomiti observations of GRB121024A
  69. GRB 121024A: TAROT Calern observatory optical detection of a bright counterpart
  70. GRB 121024A: Swift detection of a burst with an optical counterpart
  71. Swift Trigger 536502 is likely a noise fluctuation in coincidence with SAX J1818.6-1703
  72. GRB 121011A: early optical light curve
  73. GRB 121017A: Swift/UVOT Upper Limits
  74. GRB 121017A: Swift-XRT refined Analysis
  75. GRB 121017A: GROND Observations
  76. GRB 121017A: Swift-BAT refined analysis
  77. GRB 121017A: Enhanced Swift-XRT position
  78. GRB 121017A: 1.23m CAHA R-band observations
  79. GRB 121017A: BOOTES-2/TELMA observations
  80. GRB 121017A: Swift detection of a burst
  81. GRB 121011A Suzaku WAM observation of the prompt emission
  82. GRB 121014A: Swift-BAT refined analysis
  83. GRB 121014A: Swift detection of a burst
  84. GRB 121011A: Swift/UVOT Detection
  85. GRB 121011A: Fermi GBM observation
  86. GRB 121011A: Fermi-LAT detection of a burst
  87. Swift-BAT trigger 535733 is not astrophysical
  88. GRB 121011A: Swift-XRT refined Analysis
  89. GRB 121011A: optical observations
  90. GRB 121011A, Swift-BAT refined analysis
  91. Swift-BAT refined analysis of the SGR 1806-20 outburst (trigger 535747)
  92. GRB 121011A: Enhanced Swift-XRT position
  93. GRB 121011A: MASTER-Net early OT light curve
  94. GRB 121011A: Swift detection of a burst with optical afterglow
  95. Trigger 535747: Swift detection of an outburst from SGR1806-20
  96. Trigger 535733: Swift possible detection of SAX J1828.5-1037
  97. GRB 120927A: optical upper limit
  98. GRB 120804A: Late-time Chandra observation
  99. GRB 121001A: GROND Afterglow Confirmation
  100. GRB 121001A: Swift/UVOT Upper Limits

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