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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"

26684 results found.

  1. GRB 120328A: Swift detection of a burst
  2. GRB 120326A: Fermi GBM Observation
  3. GRB 120327A afterglow detection
  4. GRB 120326A: PAIRITEL NIR Observations
  5. GRB 120326A: Bassano Bresciano Observatory optical observations
  6. GRB 120327A: Swift-XRT refined Analysis
  7. GRB 120327A: Swift/UVOT further analysis
  8. GRB 120327A: Swift-BAT refined analysis
  9. GRB 120326A : SMA submm observation
  10. GRB 120327A: Enhanced Swift-XRT position
  11. GROND observations of GRB 120327A
  12. GRB 120327A: REM NIR and optical observations
  13. Skynet/PROMPT observations of GRB120327A
  14. GRB 120327A: Liverpool Telescope Observations
  15. GRB 120327A: TAROT La Silla observatory optical detection
  16. GRB 120327A: Swift detection of a burst with an optical counterpart
  17. GRB 120326A : LOT optical observation
  18. GRB 120326A: Swift-BAT refined analysis
  19. GRB 120326A: Swift-XRT refined Analysis
  20. GRB 120326A: Swift/UVOT Detection
  21. GRB 120326A: Liverpool Telescope observations
  22. GRB 120326A: Enhanced Swift-XRT position
  23. GRB 120326A: TAROT Calern observatory afterglow optical detection
  24. GRB 120326A: Swift detection of a burst
  25. IPN Triangulation of GRB 120323A (short/very intense)
  26. GRB 120324A: Swift-XRT refined Analysis
  27. GRB 120323A: Fermi GBM detection
  28. GRB 120324A: GROND observations
  29. GRB 120324A: CQUEAN rizY Observation
  30. GRB 120324A: Swift-BAT refined analysis
  31. GRB 120324A: Swift/UVOT Upper Limits
  32. GRB 120324A: TAROT La Silla observatory optical observations
  33. GRB 120324A: Enhanced Swift-XRT position
  34. GRB 120324A: Liverpool Telescope optical candidate
  35. GRB 120324A: Swift detection of a burst
  36. GRB 120316A : Suzaku WAM observation of the prompt emission
  37. GRB 120320A: Zadko optical observations
  38. GRB 120229A: Magellan observations and limit on an optical afterglow
  39. GRB 120320A: Swift/UVOT Upper Limits
  40. GRB 120320A: MITSuME Okayama Optical upper limits
  41. GRB 120320A , optical observations
  42. GRB 120320A: BOOTES-4 optical upper limit
  43. GRB 120320A: Swift-XRT refined Analysis
  44. GRB 120320A: Gemini-N and UKIRT observations
  45. GRB 120320A: Enhanced Swift-XRT position
  46. IPN Triangulation of GRB 120316A
  47. GRB 120320A: Swift detection of a burst
  48. GRB 111228A: possible detection of the SN with the TNG
  49. GRB 120302A: Swift XRT refined analysis
  50. GRB 120312A: CrAO optical upper limit
  51. GRB 120312A: Gemini and UKIRT imaging
  52. GRB 120311A: Optical follow-up
  53. GRB 120311B: Optical follow-up
  54. GRB 120311A: C88 optical limits
  55. GRB 120312A: Swift/UVOT Upper Limits
  56. GRB 120312A: WHT candidate afterglow
  57. GRB 120312A: NOT observations
  58. GRB 120312A: Swift-XRT refined Analysis
  59. GRB 120311B: C88 optical limits
  60. GRB 120312A: Swift detection of a burst
  61. GROND observations of GRB 120311A
  62. GRB 120311B: Swift/UVOT Upper Limits
  63. GRB 120311B: MITSuME Okayama Optical upper limits
  64. GRB 120311B: Faulkes Telescope North observations
  65. GRB 120311B: Swift-XRT refined Analysis
  66. GRB 120311A: Swift-XRT refined Analysis
  67. GRB 120311B: Enhanced Swift-XRT position
  68. GRB 120311B: Swift-XRT observations
  69. GRB 120311A: Swift/UVOT Upper Limits
  70. GRB 120311A: Enhanced Swift-XRT position
  71. GRB 120311A: Swift-XRT observations
  72. GRB 120311A: Liverpool Telescope optical candidate
  73. GRB 120308A: RTT150 optical observations
  74. GRB 120302A: RTT150 optical observations
  75. GRB 120308A: 1.23m CAHA I-band observations
  76. GRB 120308A: Further PAIRITEL NIR Observations
  77. GRB120308A: MITSuME Ishigakijima Optical Upper Limits
  78. GRB 120308A: Swift/UVOT Detection
  79. GRB 120308A: Swift-XRT refined Analysis
  80. GRB 120308A: Enhanced Swift-XRT position
  81. GRB 120308A: IAC80 I-band observations
  82. GRB 120308A: PAIRITEL NIR observations
  83. GRB 120308A: confirmation of the optical afterglow
  84. GRB 120308A: Liverpool Telescope optical afterglow candidate
  85. GRB 120308A: Swift detection of a burst
  86. GRB 120305A: D50 optical limits
  87. GRB 120302A: Fermi GBM Observation
  88. GRB 120302A: Swift-BAT refined position and a possible XRT and UVOT counterpart
  89. GRB 120305A: Swift/UVOT Upper Limits
  90. GRB 120305A: Swift-XRT refined Analysis
  91. GRB 120305A: Enhanced Swift-XRT position
  92. GRB 120305A: Swift-BAT refined analysis
  93. GRB 120305A - Liverpool Telescope Observations
  94. GRB 120305A: Swift detection of a short burst
  95. GRB 120302A: GROND detection of an afterglow candidate
  96. GRB 111222A: Swift observation on 2012 February 06/07
  97. GRB 120226A: Fermi-GBM and Fermi-LAT detections; LAT position retraction
  98. GRB 120226A: Fermi-LAT data analysis
  99. IPN Triangulation of GRB 120226A
  100. GRB 120227A: RAPTOR Limit During the Gamma-Ray Emitting Interval

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