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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

42601 results found.

  1. IPN Triangulation of long GRB 120916A
  2. GRB 120916A: Fermi-LAT detection of a burst
  3. Corrections to the Fermi-LAT upper limits for GRB 120807A, 120908A, 120909A, and 120911A
  4. Swift Transient Swift J174510.8-262411: Swift-BAT refined analysis
  5. Swift Trigger 533836 is a new Galactic transient
  6. GRB 120913B: Fermi GBM observation
  7. GRB 120913B: Swift-BAT refined analysis
  8. GRB 120913A: Fermi GBM observation
  9. GRB 120913B: FRAM early follow up and detection
  10. GRB 120913A: Swift-BAT refined analysis
  11. GRB 120913B: REM NIR early time detection
  12. Continued Skynet/PROMPT observations of GRB120913B
  13. GRB 120913B: TAROT La Silla observatory optical photometry
  14. GRB 120913B: TAROT La Silla observatory optical detection
  15. Skynet/PROMPT observations of GRB120913B
  16. GRB 120913B: Swift detection of a burst
  17. GRB 120913A: Swift detection of a burst
  18. GRB 120907A: optical observations of ISON-Kislovodsk
  19. GRB 120911A: optical upper limit CrAO
  20. GRB 120911A: optical upper limit ISON-NM
  21. Konus-Wind observation of GRB 120911B
  22. GRB 120911B: Fermi GBM observation
  23. GRB 120911B: Fermi-LAT detection of a burst
  24. IPN Triangulation of GRB 120911B (long/bright)
  25. GRB 120911A: Fermi GBM observation
  26. GRB 120911A: Fermi/LAT upper limit
  27. GRB 120911A: Swift-XRT refined Analysis
  28. GRB 120911A: Swift-BAT refined analysis
  29. GRB 120911A: Enhanced Swift-XRT position
  30. GRB 120911A: Faulkes Telescope North observations
  31. GRB 120911A: Swift-XRT observations
  32. GRB 120911A: ROTSE-III Optical Limits
  33. GRB 120911A: Swift detection of a burst
  34. GRB 120907A: SMA upper limits
  35. GRB 120908A and GRB 120909A : Fermi/LAT upper limit
  36. GRB 120908A: Fermi GBM detection
  37. GRB 120908A: Swift Observations
  38. GRB 120909A: TAROT La Silla observatory optical observations
  39. GRB 120909A: Pi of the Sky upper limits
  40. GRB 120909A: Fermi GBM observation
  41. Konus-Wind observation of GRB 120909A
  42. GRB 120909A: Swift/UVOT Detection
  43. GRB 120909A: Swift-XRT refined Analysis
  44. GRB 120909A: Swift-BAT refined analysis
  45. GRB 120909A: Enhanced Swift-XRT position
  46. GRB 120908A: MAXI/GSC detection
  47. GRB 120909A: X-Shooter redshift 3.93
  48. GRB 120909A: GROND detection of the afterglow
  49. Skynet/PROMPT Observations of GRB120909A
  50. GRB 120909A: Swift detection of a burst
  51. GRB 120907A: EVLA observations
  52. GRB 120907A: Swift/UVOT Detection
  53. GRB 120907A: Swift-XRT refined Analysis
  54. GRB 120907A: Spectroscopy from OSIRIS/GTC
  55. GRB 120907A: Enhanced Swift-XRT position
  56. GRB 120907A: Fermi GBM detection
  57. GRB 120907A: Swift-BAT refined analysis
  58. GRB 120907A: NOT optical observations
  59. GRB 120907A MASTER optical observations
  60. GRB 120907A: ROTSE-III Optical Limits
  61. GRB 120907A: Swift detection of a burst with optical counterpart
  62. XMM observations of the short GRB120804A
  63. GRB 120819A: optical upper limit
  64. GRB 120802A: optical observations in CrAO
  65. GRB 120830A: Further Swift Observations
  66. GRB 120830A: Swift-XRT and UVOT observations
  67. GRB 120830A: Fermi GBM observation
  68. Konus-Wind observation of GRB 120830A
  69. GRB 120830A: early MASTER optical limit
  70. IPN Triangulation of short GRB 120830A
  71. GRB 120830A: Fermi-LAT detection of a short burst
  72. Fermi trigger 368003226 : MASTER optical observations
  73. GRB 120819A: Swift/UVOT Upper Limits
  74. GRB 120817B: Deep limit on the optical afterglow from du Pont and Magellan observations
  75. GRB 120821A: Swift/XRT observations
  76. GRB 120821A: a long GRB detected by INTEGRAL
  77. GRB 120817B - PTF Observations
  78. GRB 120817A: RAPTOR Limits During Gamma-Ray Emitting Interval
  79. GRB 120811C: optical observations
  80. GRB 120817B: BAT location in ground analysis and refined analysis
  81. GRB 120819A: MASTER final limits
  82. GRB 120819A: Swift-BAT refined analysis
  83. GRB 120819A: GROND afterglow confirmation
  84. GRB 120819A: Swift-XRT refined Analysis
  85. GRB 120819A: Enhanced Swift-XRT position
  86. GRB 120819A: afterglow candidate from NOT
  87. GRB 120819A: MASTER optical observations
  88. GRB 120819A: Swift detection of a burst
  89. GRB 120817B: Swift-XRT observations
  90. GRB 120811C: optical observations
  91. GRB 120815A: MASTER-ICATE observations
  92. Konus-Wind observation of GRB 120816B
  93. IPN Triangulation of GRB 120816B (short/exceptionally intense)
  94. Konus-Wind observation of GRB 120817B
  95. GRB 120817A: Swift-XRT refined Analysis
  96. GRB 120817B: LCO Optical Observations
  97. GRB 120817B: Fermi GBM detection
  98. IPN Triangulation of GRB 120817B (short/very intense)
  99. GRB 120817A: Swift-BAT refined analysis
  100. GRB 120816A: optical upper limit

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