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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"

38354 results found.

  1. GRB 020813, radio detection
  2. GRB 020812 : optical afterglow candidate
  3. GRB020813, optical observations
  4. Millimeter observation of GRB 020813
  5. GRB020812: optical observations
  6. GRB020813, optical observations
  7. IPN error box for GRB020813
  8. IPN triangulation of GRB020813
  9. GRB020812: possible afterglow candidate
  10. Early Time Limits for GRB020813
  11. GRB020812: possible afterglow candidate
  12. GRB020813, astrometric position
  13. Spectropolarimetry of GRB 020813
  14. GRB 020813: Absorption redshift
  15. GRB 020813 multiband optical observations
  16. GRB020813: optical afterglow
  17. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  18. GRB 020812 optical observation
  19. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  20. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  21. GRB020801, optical afterglow candidate
  22. Further refinement to IPN error box for GRB020531
  23. GRB020331: Late-time Optical Light Curve (re-submission)
  24. GRB020331: Late-time Optical Light Curve
  25. GRB 020405: HST observations reveal red bump
  26. IPN triangulation of GRB020714
  27. IPN triangulation of GRB020715 (=GRB150702)
  28. IPN triangulation of GRB020714
  29. IPN triangulation of GRB150702
  30. GRB 020410: Discovery of Probable OT by HST
  31. GRB 020124, HST observations of the fading afterglow
  32. IPN triangulation of GRB020708
  33. IPN triangulation of GRB020708
  34. IPN error box for GRB020706
  35. IPN triangulation of GRB020706
  36. GRB 020705: Optical observations
  37. GRB 020625: Optical observations
  38. GRB 020531: optical photometry of Chandra sources
  39. GRB020625 (=H2081): A Long Burst Localized by HETE
  40. HETE #2081: Optical observations
  41. The Probable Host Galaxy of GRB/XRF 020427
  42. GRB/XRF 020427, detection of an underlying system with the VLT
  43. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  44. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  45. AXP 1E2259+586 optical observations
  46. Fading Optical Source in the Field of GRB020531
  47. GRB 020531, INT+WFC deep optical upper limits
  48. GRB020405: polarimetric observations
  49. GRB 020531, simultaneous optical observations
  50. GRB 020604, optical observations
  51. GRB 020531/Candidate Redshift
  52. GRB020531: Detection of Candidate Host Galaxy
  53. GRB020531: Second epoch Chandra observations
  54. GRB020604, optical observations
  55. GRB020604, BVRcIc field photometry
  56. GRB020603, BVRcIc field observations
  57. GRB020531, BVRcIc field photometry
  58. GRB020531 Optical observations with TAROT
  59. GRB020531 Optical observations with TAROT
  60. GRB 020418, optical/near-IR observations
  61. GRB 020531, Radio Observations
  62. IPN triangulation of GRB020604
  63. GRB020531 Optical Observations
  64. GRB020531: Observations with the Chandra X-ray Observatory
  65. GRB 020603, R-band observation
  66. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  67. GRB020531: Upper Limit for Detection of Two TAROT Sources
  68. GRB 020603: Optical observations
  69. IPN triangulation of GRB020603 (possible short/hard GRB)
  70. GRB 020531 optical observations with TAROT
  71. Refined IPN error box for GRB020531
  72. GRB020531, optical observations
  73. GRB020531: optical observations
  74. GRB020531, optical observation
  75. GRB020531(=H2042): Optical Observations
  76. IPN triangulation of the short, hard GRB020531 (=H2042)
  77. GRB020531(=H2042): Optical Observations
  78. GRB020531: Optical observations
  79. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  80. GRB020525, optical observations
  81. IPN detection of possible bursts from SGR1806-20
  82. IPN triangulation of GRB020525
  83. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  84. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  85. IPN triangulation of a burst from SGR1806-20
  86. GRB/XRF 020427, Radio Observations
  87. HST detection of the likely host galaxy of GRB 020124
  88. GRB020405 field photometry at ESO
  89. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  90. GRB020321 : Optical observations.
  91. GRB020427 BeppoSAX NFI Observation
  92. XRF 020427
  93. GRB020331: Third Epoch and Revised Second Epoch Optical
  94. The end of BSAX GRB activities
  95. GRB 020410, Radio Observations
  96. GRB 020418: Optical observations
  97. GRB 020124: Optical observations
  98. GRB 020418: Optical observations
  99. IPN triangulation of GRB020418
  100. GRB020405: VLT observations of the OT environment

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