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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"

27408 results found.

  1. GRB 140311C: Swift-XRT and UVOT observations
  2. GRB 140311C: MASTER before, during and after trigger optical observations
  3. GRB 140311B: Swift-BAT refined analysis
  4. GRB 140311A: RATIR Optical and NIR Detection
  5. GRB 140311C: Fermi GBM Detection
  6. GRB 140311A: Montarrenti Observatory optical upper limit
  7. GRB 140311B: Fermi GBM Detection
  8. GRB 140311A: Kottamia I-band observation
  9. GRB 140311A: Swift/UVOT Upper Limits
  10. GRB 140311B: Swift/UVOT Upper Limits
  11. Fermi416242156: possible iPTF counterpart
  12. GRB 140311B: RATIR Optical and NIR Observations
  13. GRB 140311A: Bassano Bresciano Observatory optical upper limit
  14. GRB 140311A: Swift-XRT refined Analysis
  15. GRO J1744-28: Fermi GBM observation
  16. GRB 140302A: GROND confirmation of the afterglow
  17. GRB 140311B: Swift-XRT refined Analysis
  18. GRB 140311A: Swift-BAT refined analysis
  19. GRB 140311A: Gemini-South redshift
  20. GRB 140311B: final MASTER OT light curve
  21. GRB 140311B: TAROT Calern observatory optical observations
  22. GRB 140311A: Optical follow-up observation with Kottamia 188cm telescope
  23. GRB 140311A: Zadko observatory - Gingin optical observations
  24. GRB140311B: Swift/XRT position
  25. GRB 140311B: Swift-XRT observations
  26. GRB 140311B: MASTER early optical observations
  27. GRB 140311A: Nanshan OT detection
  28. GRB 140311A: MASTER early optical observations
  29. GRB 140311B: Swift detection of a burst
  30. GRB 140311A: Swift detection of a probable burst
  31. GRB 140304A: Suzaku WAM observation of the prompt emission
  32. IPN Triangulation of GRB 140308A
  33. IPN Triangulation of GRB 140306A
  34. GRB 140304A: Continued RATIR Optical and NIR Observations
  35. GRB 140306A: Fermi GBM detection
  36. GRB 140305A: Swift-BAT refined analysis
  37. Trigger 590503: Swift-BAT triggered on noise
  38. GRB 140304A: MASTER OT light curve
  39. GRB 140305A: Swift detection of a burst
  40. GRB 140304A: RATIR g-band Dropout
  41. GRB 140304A: Swift-BAT refined analysis
  42. GRB 140304A: Swift-XRT refined Analysis
  43. GRB 140304A: Fermi GBM detection
  44. GRB 140304A: Swift/UVOT Upper Limits
  45. GRB 140304A: Khureltogot optical observations
  46. GRB 140304A: Mondy optical observations
  47. GRB 140304A: Afterglow decay from Nanshan observations
  48. GRB 140304A: Swift detection of a burst
  49. GRB 140304A: MASTER OT detecton
  50. GRB 140301A: Swift/UVOT Upper Limits
  51. GRB 140302A: Swift/UVOT Upper Limits
  52. GRB140302A: Fermi GBM detection
  53. GRB 140302A: Swift-XRT refined Analysis
  54. GRB 140302A: Swift-BAT refined analysis
  55. GRB 140301A: Swift-BAT refined analysis
  56. GRB 140301A: Swift-XRT refined Analysis
  57. GRB 140301A: GROND Detection of the Optical/NIR Afterglow
  58. GRB 140302A: GROND afterglow candidate
  59. GRB 140302A: Swift detection of a burst
  60. GRB 140301A: NOT afterglow candidate
  61. GRB 140301A: Skynet R-COP Observations
  62. GRB 140301A: Swift detection of a burst
  63. GRB 140226A/iPTF14yb: Swift/UVOT Observations
  64. IPN triangulation of GRB 140226A, a possible GRB counterpart to iPTF14yb
  65. GRB 140219A: the confirmation of the brightening SDSS J102406.41+062937.6 star
  66. GRB 140219A: MASTER optical brightening inside XRT-5 error box detection
  67. GRB 140219A: iPTF optical observations
  68. GRB 140102A: TAOS early optical afterglow detection
  69. GRB 140219A: XRT afterglow candidate
  70. GRB 140221A: Results from Swift XRT tiled observations
  71. GRB 140219A: results from Swift XRT and UVOT tiled observations
  72. GRB 140219A: MASTER before and after GRB observational arguments of the exceptionally Dark GRB
  73. GRB 140219A: Fermi-LAT detection of a burst
  74. GRB 140219A: Fermi GBM Detection
  75. IPN Triangulation of extremely bright long GRB 140219A
  76. Swift follow-up of an Integral weak transient
  77. GRB 140213A: Continued Skynet R-COP/PROMPT Observations of the Optical Afterglow
  78. GRB 140215A: RAPTOR Observations During Gamma-Ray Emitting Interval
  79. Fermi GBM trigger 140214230 is not a GRB
  80. GRB 140213A: Continued Skynet R-COP/PROMPT Detections of a Rebrightening Optical Afterglow
  81. GRB 140215A: Continued Skynet PROMPT Observations of the Optical Afterglow
  82. GRB 140211A: Khureltogot optical upper limits
  83. GRB 140215A: Continued RATIR Optical and NIR Observations
  84. Konus-Wind observation of GRB 140213A
  85. Konus-Wind observation of GRB 140215A
  86. GRB 140215A: Swift/UVOT Detection
  87. GRB 140211A: Swift-XRT and UVOT observations
  88. GRB140215A: Continued Discovery Channel Telescope Observations
  89. GRB 140215A: Continued RATIR Optical and NIR Observations
  90. GRB 140215A: Swift-BAT refined analysis
  91. GRB 140215A: ISON-NM optical observations
  92. GRB 140215A: Swift-XRT refined Analysis
  93. GRB 140215A: P60 observations
  94. GRB 140215A: RATIR Optical and NIR Observations
  95. GRB140215A: Skynet PROMPT Optical Observations
  96. GRB140215A: Prompt Observations with Discovery Channel Telescope
  97. GRB 140215A: Swift detection of a burst with optical counterpart
  98. GRB 140213A: Swift-BAT refined analysis
  99. GRB140206A: Discovery Channel Telescope Optical Detection
  100. GRB 140213A: Swift/UVOT Observations

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