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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"

11468 results found.

  1. GRB 120328A: Enhanced Swift-XRT position
  2. GRB 120326A: Xinglong TNT further optical observation��correction for GCN Cir 13149)
  3. GRB 120326A: Xinglong TNT further optical observation
  4. GRB 120328A: Swift detection of a burst
  5. GRB 120326A: Fermi GBM Observation
  6. GRB 120326A: Bassano Bresciano Observatory optical observations
  7. GRB 120327A: CQUEAN grizY Observation
  8. GRB 120327A: Swift/UVOT further analysis
  9. GRB120326A: TNT optical observation
  10. GRB 120326A: Swift-BAT refined analysis
  11. GRB 120326A: Swift-XRT refined Analysis
  12. GRB120326A: IAC80 observations
  13. GRB 120326A: ROTSE-III Optical Limits
  14. GRB 120326A: Swift detection of a burst
  15. Konus-Wind observation of GRB 120323A
  16. IPN Triangulation of GRB 120323A (short/very intense)
  17. Konus-Wind observation of GRB 120324A
  18. GRB 120316A: Fermi-GBM and Fermi-LAT Observations
  19. GRB 120320A: MITSuME Okayama Optical upper limits
  20. GRB 120320A , optical observations
  21. GRB 120320A: Swift-XRT refined Analysis
  22. Konus-Wind observation of GRB 120316A
  23. GRB 120320A: MASTER optical observations
  24. GRB 120320A: Swift detection of a burst
  25. GRB 120311A: C88 optical limits
  26. GRB 120312A: Swift-XRT refined Analysis
  27. GRB 120312A: Swift detection of a burst
  28. GROND observations of GRB 120311A
  29. GRB 120311B: Swift detection of a burst
  30. GRB 120302A: RTT150 optical observations
  31. GRB 120308A: Swift/UVOT Detection
  32. GRB 120308A: Swift-XRT refined Analysis
  33. GRB 120308A: Swift detection of a burst
  34. GRB 120302A, the review of the sky area in plate archives
  35. GRB 120302A: Swift-BAT refined position and a possible XRT and UVOT counterpart
  36. GRB 120305A: Swift-BAT refined analysis
  37. GRB 120302A, Swift-BAT refined analysis
  38. Konus-Wind observation of GRB 120226A
  39. GRB 120226A: Fermi-GBM and Fermi-LAT detections; LAT position retraction
  40. IPN Triangulation of GRB 120226A
  41. GRB 120226A: Fermi-LAT detection of a burst
  42. GRB 120219A, the review of the sky area in plate archives
  43. GRB 120224A: Swift-XRT refined Analysis
  44. GRB 120224A: Swift-BAT refined analysis
  45. GRB 120224A: Swift detection of a burst
  46. GRB 120219A: MASTER prompt and early optical limit and OT discussion
  47. GRB120219A: Keck Observations
  48. GRB 120219A: Swift-XRT refined Analysis
  49. GRB 120219A: Swift detection of a burst
  50. GRB 120218A: Swift detection of a burst
  51. GRB 120215A: Swift-XRT refined Analysis
  52. Fermi GBM detection of an SGR-like burst
  53. GRB 120215A: Swift detection of a burst
  54. GRB 120213A: MASTER-NET early optical observations
  55. GRB 120213A: Prompt enhanced Swift-XRT position
  56. GRB 120212A: Swift-XRT refined Analysis
  57. GRB 120212A: Swift-XRT observations
  58. GRB 120211A, optical observations
  59. GRB 120211A: Swift-XRT refined Analysis
  60. GRB 120211A: Swift detection of a burst
  61. GRB 120202A: A long GRB detected by INTEGRAL
  62. GRB 120129A: MASTER optical observations
  63. Konus-Wind observation of GRB 120129A
  64. IPN Triangulation of GRB 120129A (long/intense)
  65. GRB 120127A: MAXI/GSC detection of a probable GRB
  66. GRB 120119A: optical observations
  67. GRB 120118B: RTT150 optical observations
  68. GRB 120119A: Swift-XRT refined Analysis
  69. Konus-Wind observation of GRB 120119A
  70. GRB 120118B: Swift-XRT refined Analysis
  71. XRF 120118A: early optical limit by "Pi of the Sky"
  72. XRF 120118A: an X-Ray Flash detected by INTEGRAL
  73. GRB 120116A: Swift-XRT refined Analysis
  74. GRB 120116A: Mondy optical observations
  75. GRB 120116A: Optical observations at Crni Vrh
  76. GRB 120116A: Swift detection of a burst
  77. GRB 120114A found in ground analysis of BAT data
  78. GRB 120106A: optical upper limit
  79. Konus-Wind observation of GRB 120107A
  80. GRB 120106A: MITSuME Okayama Ks-band upper limit
  81. GRB 120106A: Swift detection of a burst
  82. GRB 111225A, the review of the sky area in plate archives
  83. GRB 111222A, the review of the sky area in plate archives
  84. Konus-Wind observation of GRB 120102A
  85. GRB 120102A: Swift-BAT refined analysis
  86. Konus-Wind observation of GRB 111228A
  87. GRB 111228A: MASTER-Net optical photometry
  88. GRB 111229A: Swift/UVOT Detection
  89. GRB 111229A: Swift detection of a burst
  90. GRB 111228A: Swift-XRT refined Analysis
  91. GRB 111228A: Skynet/Dolomiti Optical Observations
  92. XMM-Newton observation of the short GRB 111020A
  93. GRB 111228A: Swift detection of a burst with an optical counterpart
  94. GRB 111225A: GRT Optical Observation
  95. GRB 111225A: Swift-XRT refined Analysis
  96. GRB 111225A: TAROT Calern observatory optical detection
  97. GRB 111222A: Swift-XRT observations
  98. Konus-Wind observation of GRB 111222A
  99. GRB 110820A: optical observations in Maidanak observatory
  100. GRB 111215B: Suzaku WAM observation of the prompt emission

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