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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"

28262 results found.

  1. GRB 120326A: Swift/UVOT Detection
  2. GRB 120326A: Optical observations at Crni Vrh
  3. GRB 120326A: Liverpool Telescope observations
  4. GRB 120326A: Enhanced Swift-XRT position
  5. GRB 120326A: TAROT Calern observatory afterglow optical detection
  6. GRB 120326A: Swift detection of a burst
  7. IPN Triangulation of GRB 120323A (short/very intense)
  8. GRB 120324A: Swift-XRT refined Analysis
  9. GRB 120323A: Fermi GBM detection
  10. GRB 120324A: GROND observations
  11. GRB 120324A: CQUEAN rizY Observation
  12. GRB 120324A: Swift-BAT refined analysis
  13. GRB 120324A: Swift/UVOT Upper Limits
  14. GRB 120324A: TAROT La Silla observatory optical observations
  15. GRB 120324A: Enhanced Swift-XRT position
  16. GRB 120324A: Liverpool Telescope optical candidate
  17. GRB 120324A: Swift detection of a burst
  18. Simultaneous optical images of Swift pointing are available by GRT
  19. GRB 120316A : Suzaku WAM observation of the prompt emission
  20. GRB 120320A: Zadko optical observations
  21. GRB 120320A, the review of the sky area in plate archives
  22. GRB 120316A: Fermi-GBM and Fermi-LAT Observations
  23. GRB 120229A: Magellan observations and limit on an optical afterglow
  24. GRB 120320A: Swift/UVOT Upper Limits
  25. GRB 120320A: MITSuME Okayama Optical upper limits
  26. GRB 120320A , optical observations
  27. GRB 120320A: BOOTES-4 optical upper limit
  28. GRB 120320A: Swift-XRT refined Analysis
  29. GRB 120320A, Swift-BAT refined analysis
  30. GRB 120320A: Gemini-N and UKIRT observations
  31. GRB 120320A: Enhanced Swift-XRT position
  32. IPN Triangulation of GRB 120316A
  33. GRB 120320A: Swift detection of a burst
  34. GRB 111228A: possible detection of the SN with the TNG
  35. Trigger 517876 is a Swift detection of GX 5-1
  36. GRB 120302A: Swift XRT refined analysis
  37. GRB 120312A, the review of the sky area in plate archives
  38. GRB 120312A: CrAO optical upper limit
  39. GRB 120312A: Gemini and UKIRT imaging
  40. GRB 120311A, the review of the sky area in plate archives
  41. GRB 120311A: Optical follow-up
  42. GRB 120311B: Optical follow-up
  43. GRB 120311A: C88 optical limits
  44. GRB 120312A: Swift/UVOT Upper Limits
  45. GRB 120312A: WHT candidate afterglow
  46. GRB 120312A: NOT observations
  47. GRB 120312A: Swift-XRT refined Analysis
  48. GRB 120312A: Swift-BAT refined analysis
  49. GRB 120311B: C88 optical limits
  50. GRB 120312A: Swift detection of a burst
  51. GROND observations of GRB 120311A
  52. GRB 120311B: Swift/UVOT Upper Limits
  53. GRB 120311B: MITSuME Okayama Optical upper limits
  54. GRB 120311B: Faulkes Telescope North observations
  55. GRB 120311B: Swift-XRT refined Analysis
  56. GRB 120311A: Swift-XRT refined Analysis
  57. GRB 120311B: Enhanced Swift-XRT position
  58. GRB 120311B: Swift-BAT refined analysis
  59. GRB 120311B: Swift-XRT observations
  60. GRB 120311A, Swift-BAT refined analysis
  61. GRB 120311A: Swift/UVOT Upper Limits
  62. GRB 120311A: Enhanced Swift-XRT position
  63. GRB 120311A: Swift-XRT observations
  64. GRB 120308A : LOAO optical observation
  65. GRB 120308A: RTT150 optical observations
  66. GRB 120302A: RTT150 optical observations
  67. GRB 120308A: 1.23m CAHA I-band observations
  68. GRB 120308A: Further PAIRITEL NIR Observations
  69. GRB120308A: MITSuME Ishigakijima Optical Upper Limits
  70. GRB 120308A: Swift/UVOT Detection
  71. GRB 120308A: Swift-XRT refined Analysis
  72. GRB 120308A: Enhanced Swift-XRT position
  73. GRB 120308A: Swift-BAT refined analysis
  74. GRB 120308A: IAC80 I-band observations
  75. GRB 120308A: PAIRITEL NIR observations
  76. GRB 120308A: confirmation of the optical afterglow
  77. GRB 120308A: Swift detection of a burst
  78. GRB 120305A: D50 optical limits
  79. GRB 120305A: Swift spectral lag analysis
  80. GRB 120302A, the review of the sky area in plate archives
  81. GRB 120302A: Swift-BAT refined position and a possible XRT and UVOT counterpart
  82. GRB 120305A: Swift/UVOT Upper Limits
  83. GRB 120305A: Swift-XRT refined Analysis
  84. GRB 120305A: Enhanced Swift-XRT position
  85. GRB 120305A: Swift-BAT refined analysis
  86. GRB 120305A: Swift detection of a short burst
  87. GRB 120302A: GROND detection of an afterglow candidate
  88. GRB 120302A, Swift-BAT refined analysis
  89. GRB 111222A: Swift observation on 2012 February 06/07
  90. GRB 120229A, Swift-BAT refined analysis
  91. GRB 120226A: Fermi-GBM and Fermi-LAT detections; LAT position retraction
  92. IPN Triangulation of GRB 120226A
  93. GRB 120227A: RAPTOR Limit During the Gamma-Ray Emitting Interval
  94. GRB 120224A: optical observation in Mondy observatory
  95. GRB 120224A: GROND detection of the afterglow candidate
  96. GRB 120219A, the review of the sky area in plate archives
  97. GRB 120224A: Swift-XRT refined Analysis
  98. Swift Trigger 516027 is CC Eri
  99. GRB 120224A: Swift/UVOT Upper Limits
  100. GRB 120224A: Swift-BAT refined analysis

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