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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"

11394 results found.

  1. GRB070125: Swift-XRT Refined Analysis
  2. GRB 070125: SARA detection in R
  3. RHESSI Spectrum of GRB070125
  4. Konus-Wind observation of short hard GRB 070124
  5. IPN localization of GRB070124 (short duration, hard spectrum)
  6. GRB 070110: Continued Detection and Request for Ground Followup
  7. GRB 070110: Ep,i - Eiso correlation
  8. GRB 070110 declared a "Burst of Interest" by Swift team
  9. Further Retractions of previous Swift-BAT triggers
  10. Trigger 255685: Swift detection of a possible burst
  11. GRB 070103: Swift detection of a burst
  12. Retractions of previous Swift-BAT triggers
  13. Konus-Wind observation of GRB 061222A
  14. GRB 061210: Swift/XRT Astrometry Correction
  15. GRB061222B: Swift-XRT Refined Analysis
  16. GRB 061222B: SARA upper limit
  17. GRB 061222A: Prompt ROTSE-III Optical Limits
  18. GRB 061217: Astrometry-Corrected XRT Position
  19. GRB 061217, SMARTS optical observations
  20. GRB 061217: ROTSE-III Optical Limits
  21. GRB 061214(?): ROTSE-III Optical Limits
  22. GRB 061210: Suzaku WAM observation of the prompt emission
  23. GRB 061210: Swift-BAT detection of a short burst
  24. Konus-Wind observation of GRB 061201
  25. GRB 061202, Swift-BAT refined analysis
  26. GRB 061122: GETS observation
  27. GRB 061121: Second Epoch ATCA Radio Observations
  28. GRB 061126: optical observation
  29. GRB 061126: Tautenburg afterglow observations
  30. GRB 061121: MDM Continued Monitoring
  31. GRB 061121: MDM Optical Decay
  32. GRB 061121: ART detection in Ic
  33. Konus-Wind observation of GRB 061122
  34. Konus-Wind and Konus-A observations of GRB 061121
  35. INTEGRAL results on GRB 061122
  36. GRB 061122A: a long GRB detected by INTEGRAL
  37. GRB 061121, Swift-BAT refined analysis
  38. GRB 061121: Faulkes Telescope North Optical Observation
  39. GRB 060111B: Swift UVOT Refined Magnitudes
  40. GRB061110B: Optical observations at Crni Vrh
  41. GRB 061110B: NOT optical observations
  42. GRB 061110: ROTSE-III Optical Limits
  43. GRB061019: second epoch CrAO observations
  44. GRB061102B: Super-LOTIS observations
  45. GRB 061028: Optical R passband observations
  46. GRB 061028: z band imaging
  47. GRB 061027, Swift refined analysis of a possible burst
  48. GRB061025: Swift XRT refined analysis
  49. GRB 061025: Gemini-S observations
  50. GRB061025: Swift XRT position
  51. GRB 061025: ROTSE-III Optical Limits
  52. GRB 061025: a long GRB detected by INTEGRAL
  53. Konus-Wind observation of GRB 061021
  54. GRB 061021: Swift-XRT refined analysis
  55. GRB 061021: Swift detection of a burst
  56. GRB061019: optical observations
  57. GRB 061019: SARA upper limit
  58. GRB 060930: MARGE Optical Limits
  59. GRB 061019, Swift-BAT refined analysis
  60. GRB 061019: Swift-BAT detection of a burst
  61. GRB 061007: RHESSI Spectral Fit
  62. Konus-Wind observation of GRB 061007
  63. Konus-Wind observation of the short hard GRB 061006
  64. Konus-Wind observation of GRB 060928
  65. GRB 060928: RHESSI Spectral Fit
  66. GRB 060930: near-IR afterglow candidate
  67. GRB 061002, Swift-BAT refined analysis
  68. GRB061002: MASTER-VWF-Kislovodsk observations
  69. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  70. GRB 061002: Swift detection of a burst
  71. GRB 060807: Detection of a possible host galaxy
  72. GRB060930: Faulkes Telescope South observation
  73. GRB 060930: ROTSE-III Optical Limits
  74. GRB 060930: A long X-ray rich GRB detected by INTEGRAL
  75. GRB 060929: BART observation
  76. GRB 060929: MASTER-VWF-Kislovodsk observations
  77. GRB 060929: BOOTES-IR & OSN observations
  78. Liverpool Telescope observations of GRB 060929
  79. GRB060908: optical observations
  80. GRB 060927 optical limit
  81. GRB 060927 : Kiso optical observation
  82. GRB 060927: Swift detection of a burst
  83. GRB060923C: AROMA optical obsevation
  84. GRB 060923, Swift-BAT refined analysis
  85. Swift detection of IGR J17497-2821 (trigger 230504)
  86. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  87. GRB 060919: Swift detection of a burst
  88. Konus-Wind observation of GRB 060912
  89. GRB060912: Swift/UVOT Observations
  90. GRB 060912B: a long GRB detected with INTEGRAL
  91. GRB 060912: Swift XRT Team Refined Analysis
  92. GRB 060912: Swift detection of a burst with an optical afterglow
  93. GRB 060908, Swift/XRT refined analysis
  94. GRB 060908: Swift/UVOT Observations
  95. GRB 060904A : Optical limit
  96. GRB 060908: REM optical prompt observation
  97. GRB 060908: PROMPT Detection of a Bright Counterpart
  98. GRB 060908: Swift detection of a burst with a bright optical counterpart
  99. GRB 060906: optical observation
  100. GRB 060906: observations with FRAM

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