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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"

12091 results found.

  1. Konus-Wind observation of short hard GRB 070124
  2. IPN localization of GRB070124 (short duration, hard spectrum)
  3. GRB 070110: Continued Detection and Request for Ground Followup
  4. GRB 070110: Ep,i - Eiso correlation
  5. GRB 070110 declared a "Burst of Interest" by Swift team
  6. Further Retractions of previous Swift-BAT triggers
  7. Trigger 255685: Swift detection of a possible burst
  8. GRB 070103: Swift detection of a burst
  9. Retractions of previous Swift-BAT triggers
  10. Konus-Wind observation of GRB 061222A
  11. GRB 061210: Swift/XRT Astrometry Correction
  12. GRB061222B: Swift-XRT Refined Analysis
  13. GRB 061222B: SARA upper limit
  14. GRB 061222A: Prompt ROTSE-III Optical Limits
  15. GRB 061217: Astrometry-Corrected XRT Position
  16. GRB 061217, SMARTS optical observations
  17. GRB 061217: ROTSE-III Optical Limits
  18. GRB 061214(?): ROTSE-III Optical Limits
  19. GRB 061210: Suzaku WAM observation of the prompt emission
  20. GRB 061210: Swift-BAT detection of a short burst
  21. Konus-Wind observation of GRB 061201
  22. GRB 061202, Swift-BAT refined analysis
  23. GRB 061122: GETS observation
  24. GRB 061121: Second Epoch ATCA Radio Observations
  25. GRB 061126: optical observation
  26. GRB 061126: Tautenburg afterglow observations
  27. GRB 061121: MDM Continued Monitoring
  28. GRB 061121: MDM Optical Decay
  29. GRB 061121: ART detection in Ic
  30. Konus-Wind observation of GRB 061122
  31. Konus-Wind and Konus-A observations of GRB 061121
  32. INTEGRAL results on GRB 061122
  33. GRB 061122A: a long GRB detected by INTEGRAL
  34. GRB 061121, Swift-BAT refined analysis
  35. GRB 061121: Faulkes Telescope North Optical Observation
  36. GRB 060111B: Swift UVOT Refined Magnitudes
  37. GRB061110B: Optical observations at Crni Vrh
  38. GRB 061110B: NOT optical observations
  39. GRB 061110: ROTSE-III Optical Limits
  40. GRB061019: second epoch CrAO observations
  41. GRB061102B: Super-LOTIS observations
  42. GRB 061028: Optical R passband observations
  43. GRB 061028: z band imaging
  44. GRB 061027, Swift refined analysis of a possible burst
  45. GRB061025: Swift XRT refined analysis
  46. GRB 061025: Gemini-S observations
  47. GRB061025: Swift XRT position
  48. GRB 061025: ROTSE-III Optical Limits
  49. GRB 061025: a long GRB detected by INTEGRAL
  50. Konus-Wind observation of GRB 061021
  51. GRB 061021: Swift-XRT refined analysis
  52. GRB 061021: Swift detection of a burst
  53. GRB061019: optical observations
  54. GRB 061019: SARA upper limit
  55. GRB 060930: MARGE Optical Limits
  56. GRB 061019, Swift-BAT refined analysis
  57. GRB 061019: Swift-BAT detection of a burst
  58. GRB 061007: RHESSI Spectral Fit
  59. Konus-Wind observation of GRB 061007
  60. Konus-Wind observation of the short hard GRB 061006
  61. Konus-Wind observation of GRB 060928
  62. GRB 060928: RHESSI Spectral Fit
  63. GRB 060930: near-IR afterglow candidate
  64. GRB 061002, Swift-BAT refined analysis
  65. GRB061002: MASTER-VWF-Kislovodsk observations
  66. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  67. GRB 061002: Swift detection of a burst
  68. GRB 060807: Detection of a possible host galaxy
  69. GRB060930: Faulkes Telescope South observation
  70. GRB 060930: ROTSE-III Optical Limits
  71. GRB 060930: A long X-ray rich GRB detected by INTEGRAL
  72. GRB 060929: BART observation
  73. GRB 060929: MASTER-VWF-Kislovodsk observations
  74. GRB 060929: BOOTES-IR & OSN observations
  75. Liverpool Telescope observations of GRB 060929
  76. GRB060908: optical observations
  77. GRB 060927 optical limit
  78. GRB 060927 : Kiso optical observation
  79. GRB 060927: Swift detection of a burst
  80. GRB060923C: AROMA optical obsevation
  81. GRB 060923, Swift-BAT refined analysis
  82. Swift detection of IGR J17497-2821 (trigger 230504)
  83. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  84. GRB 060919: Swift detection of a burst
  85. Konus-Wind observation of GRB 060912
  86. GRB060912: Swift/UVOT Observations
  87. GRB 060912B: a long GRB detected with INTEGRAL
  88. GRB 060912: Swift XRT Team Refined Analysis
  89. GRB 060912: Swift detection of a burst with an optical afterglow
  90. GRB 060908, Swift/XRT refined analysis
  91. GRB 060908: Swift/UVOT Observations
  92. GRB 060904A : Optical limit
  93. GRB 060908: REM optical prompt observation
  94. GRB 060908: PROMPT Detection of a Bright Counterpart
  95. GRB 060908: Swift detection of a burst with a bright optical counterpart
  96. GRB 060906: optical observation
  97. GRB 060906: observations with FRAM
  98. GRB 060906: Swift detection of a probable burst
  99. GRB 060904B: RTT150 optical observations
  100. Konus-Wind observation of GRB 060904A

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