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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"

11756 results found.

  1. GRB 070223, Swift-BAT refined analysis
  2. Konus-Wind and Konus-A observations of GRB 070220
  3. GRB 070220: MITSuME Okayama Optical Observation
  4. GRB 070220: ART-3 Optical and NIR limits
  5. GRB 070220: Observation with the KANATA 1.5m telescope
  6. GRB070219: MASTER-VWF-Kislovodsk observations
  7. GRB 070219, Swift-BAT refined analysis
  8. GRB 070219: ROTSE-III Optical Limits
  9. GRB070219 - SDSS Pre-Burst Observations
  10. GRB 070201: clarification on localization and Konus-Wind spectra
  11. IPN localization of very bright long hard GRB 070207
  12. IPN localization of very intense short GRB 070201
  13. GRB 070208: ROTSE-III Optical Limits
  14. GRB 070125: further AAVSO optical observations
  15. GRB 070129, Swift-BAT refined analysis of a particularly long
  16. Konus-Wind observation of GRB 070125
  17. GRB070125: Swift-XRT Refined Analysis
  18. GRB 070125: SARA detection in R
  19. RHESSI Spectrum of GRB070125
  20. Konus-Wind observation of short hard GRB 070124
  21. IPN localization of GRB070124 (short duration, hard spectrum)
  22. GRB 070110: Continued Detection and Request for Ground Followup
  23. GRB 070110: Ep,i - Eiso correlation
  24. GRB 070110 declared a "Burst of Interest" by Swift team
  25. Further Retractions of previous Swift-BAT triggers
  26. Trigger 255685: Swift detection of a possible burst
  27. GRB 070103: Swift detection of a burst
  28. Retractions of previous Swift-BAT triggers
  29. Konus-Wind observation of GRB 061222A
  30. GRB 061210: Swift/XRT Astrometry Correction
  31. GRB061222B: Swift-XRT Refined Analysis
  32. GRB 061222B: SARA upper limit
  33. GRB 061222A: Prompt ROTSE-III Optical Limits
  34. GRB 061217: Astrometry-Corrected XRT Position
  35. GRB 061217, SMARTS optical observations
  36. GRB 061217: ROTSE-III Optical Limits
  37. GRB 061214(?): ROTSE-III Optical Limits
  38. GRB 061210: Suzaku WAM observation of the prompt emission
  39. GRB 061210: Swift-BAT detection of a short burst
  40. Konus-Wind observation of GRB 061201
  41. GRB 061202, Swift-BAT refined analysis
  42. GRB 061122: GETS observation
  43. GRB 061121: Second Epoch ATCA Radio Observations
  44. GRB 061126: optical observation
  45. GRB 061126: Tautenburg afterglow observations
  46. GRB 061121: MDM Continued Monitoring
  47. GRB 061121: MDM Optical Decay
  48. GRB 061121: ART detection in Ic
  49. Konus-Wind observation of GRB 061122
  50. Konus-Wind and Konus-A observations of GRB 061121
  51. INTEGRAL results on GRB 061122
  52. GRB 061122A: a long GRB detected by INTEGRAL
  53. GRB 061121, Swift-BAT refined analysis
  54. GRB 061121: Faulkes Telescope North Optical Observation
  55. GRB 060111B: Swift UVOT Refined Magnitudes
  56. GRB061110B: Optical observations at Crni Vrh
  57. GRB 061110B: NOT optical observations
  58. GRB 061110: ROTSE-III Optical Limits
  59. GRB061019: second epoch CrAO observations
  60. GRB061102B: Super-LOTIS observations
  61. GRB 061028: Optical R passband observations
  62. GRB 061028: z band imaging
  63. GRB 061027, Swift refined analysis of a possible burst
  64. GRB061025: Swift XRT refined analysis
  65. GRB 061025: Gemini-S observations
  66. GRB061025: Swift XRT position
  67. GRB 061025: ROTSE-III Optical Limits
  68. GRB 061025: a long GRB detected by INTEGRAL
  69. Konus-Wind observation of GRB 061021
  70. GRB 061021: Swift-XRT refined analysis
  71. GRB 061021: Swift detection of a burst
  72. GRB061019: optical observations
  73. GRB 061019: SARA upper limit
  74. GRB 060930: MARGE Optical Limits
  75. GRB 061019, Swift-BAT refined analysis
  76. GRB 061019: Swift-BAT detection of a burst
  77. GRB 061007: RHESSI Spectral Fit
  78. Konus-Wind observation of GRB 061007
  79. Konus-Wind observation of the short hard GRB 061006
  80. Konus-Wind observation of GRB 060928
  81. GRB 060928: RHESSI Spectral Fit
  82. GRB 060930: near-IR afterglow candidate
  83. GRB 061002, Swift-BAT refined analysis
  84. GRB061002: MASTER-VWF-Kislovodsk observations
  85. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  86. GRB 061002: Swift detection of a burst
  87. GRB 060807: Detection of a possible host galaxy
  88. GRB060930: Faulkes Telescope South observation
  89. GRB 060930: ROTSE-III Optical Limits
  90. GRB 060930: A long X-ray rich GRB detected by INTEGRAL
  91. GRB 060929: BART observation
  92. GRB 060929: MASTER-VWF-Kislovodsk observations
  93. GRB 060929: BOOTES-IR & OSN observations
  94. Liverpool Telescope observations of GRB 060929
  95. GRB060908: optical observations
  96. GRB 060927 optical limit
  97. GRB 060927 : Kiso optical observation
  98. GRB 060927: Swift detection of a burst
  99. GRB060923C: AROMA optical obsevation
  100. GRB 060923, Swift-BAT refined analysis

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