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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"

37332 results found.

  1. GRB 120913A: Swift-BAT refined analysis
  2. GRB 120913B: REM NIR early time detection
  3. Continued Skynet/PROMPT observations of GRB120913B
  4. GRB 120913B: TAROT La Silla observatory optical photometry
  5. GRB 120913B: TAROT La Silla observatory optical detection
  6. GRB 120913B: Swift detection of a burst
  7. GRB 120913A: Swift detection of a burst
  8. GRB 120907A: optical observations of ISON-Kislovodsk
  9. GRB 120911A: optical upper limit CrAO
  10. GRB 120911A: optical upper limit ISON-NM
  11. Konus-Wind observation of GRB 120911B
  12. GRB 120911B: Fermi GBM observation
  13. GRB 120911B: Fermi-LAT detection of a burst
  14. IPN Triangulation of GRB 120911B (long/bright)
  15. GRB 120911A: Fermi GBM observation
  16. GRB120911A: MITSuME Okayama Optical upper limits
  17. GRB 120911A: Fermi/LAT upper limit
  18. GRB 120911A: Swift/UVOT Upper Limits
  19. GRB 120911A: Swift-XRT refined Analysis
  20. GRB 120911A: Swift-BAT refined analysis
  21. GRB 120911A: Enhanced Swift-XRT position
  22. GRB 120911A: Faulkes Telescope North observations
  23. GRB 120911A: Swift-XRT observations
  24. GRB 120911A: ROTSE-III Optical Limits
  25. GRB 120911A: Swift detection of a burst
  26. GRB 120907A: SMA upper limits
  27. GRB 120908A and GRB 120909A : Fermi/LAT upper limit
  28. GRB 120908A: Fermi GBM detection
  29. GRB 120908A: Swift Observations
  30. GRB 120909A: TAROT La Silla observatory optical observations
  31. GRB 120909A: Pi of the Sky upper limits
  32. GRB 120909A: Fermi GBM observation
  33. Konus-Wind observation of GRB 120909A
  34. GRB 120909A: Swift/UVOT Detection
  35. GRB 120909A: Swift-XRT refined Analysis
  36. GRB 120909A: Swift-BAT refined analysis
  37. GRB 120909A: Enhanced Swift-XRT position
  38. GRB 120908A: MAXI/GSC detection
  39. GRB 120909A: X-Shooter redshift 3.93
  40. GRB 120909A: GROND detection of the afterglow
  41. GRB 120909A: Swift detection of a burst
  42. GRB 120907A: EVLA observations
  43. GRB 120907A: Swift/UVOT Detection
  44. GRB 120907A: Swift-XRT refined Analysis
  45. GRB 120907A: Spectroscopy from OSIRIS/GTC
  46. GRB 120907A: Enhanced Swift-XRT position
  47. GRB 120907A: Fermi GBM detection
  48. GRB 120907A: Swift-BAT refined analysis
  49. GRB 120907A: NOT optical observations
  50. GRB 120907A MASTER optical observations
  51. GRB 120907A: ROTSE-III Optical Limits
  52. GRB 120907A: Swift detection of a burst with optical counterpart
  53. GRB 120819A: optical upper limit
  54. GRB 120802A: optical observations in CrAO
  55. GRB 120830A: Further Swift Observations
  56. GRB 120830A: catalog source at Uvot position
  57. GRB 120830A: Swift-XRT and UVOT observations
  58. GRB 120830A: Fermi GBM observation
  59. Konus-Wind observation of GRB 120830A
  60. GRB 120830A: early MASTER optical limit
  61. IPN Triangulation of short GRB 120830A
  62. GRB 120830A: Fermi-LAT detection of a short burst
  63. Fermi trigger 368003226 : MASTER optical observations
  64. GRB 120819A: Swift/UVOT Upper Limits
  65. GRB 120817A: Swift/UVOT Upper Limits
  66. GRB 120817B: Deep limit on the optical afterglow from du Pont and Magellan observations
  67. GRB 120821A: Swift/XRT observations
  68. GRB 120821A: Swift/UVOT Upper Limits
  69. GRB 120821A: GROND upper limits
  70. GRB 120821A: a long GRB detected by INTEGRAL
  71. GRB 120817B - PTF Observations
  72. GRB 120817A: RAPTOR Limits During Gamma-Ray Emitting Interval
  73. GRB 120811C: optical observations
  74. GRB 120817B: BAT location in ground analysis and refined analysis
  75. GRB 120819A: MASTER final limits
  76. GRB 120819A: Bassano Bresciano Observatory optical observations
  77. GRB 120819A: Swift-BAT refined analysis
  78. GRB 120819A: GROND afterglow confirmation
  79. GRB 120819A: Swift-XRT refined Analysis
  80. GRB 120819A: MITSuME Ishigakijima upper limits
  81. GRB 120819A: MITSuME Okayama Optical upper limits
  82. GRB 120819A: Enhanced Swift-XRT position
  83. GRB 120819A: afterglow candidate from NOT
  84. GRB 120819A: MASTER optical observations
  85. GRB 120819A: Swift detection of a burst
  86. GRB 120817B: Swift-XRT observations
  87. GRB 120811C: optical observations
  88. GRB 120816A: Swift/UVOT Detection of the Optical Afterglow
  89. GRB 120815A: MASTER-ICATE observations
  90. Konus-Wind observation of GRB 120816B
  91. IPN Triangulation of GRB 120816B (short/exceptionally intense)
  92. Konus-Wind observation of GRB 120817B
  93. GRB 120817A: Swift-XRT refined Analysis
  94. GRB 120817B: LCO Optical Observations
  95. GRB 120817B: Fermi GBM detection
  96. IPN Triangulation of GRB 120817B (short/very intense)
  97. GRB 120817A: Swift-BAT refined analysis
  98. GRB 120816A: optical upper limit
  99. GRB 120817A: Enhanced Swift-XRT position
  100. GRB 120815A: Swift/UVOT Detection of the Optical Afterglow

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