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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"

41685 results found.

  1. XRF 020903, optical observations
  2. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  3. INTEGRAL GRBs added to GCN
  4. GRB020813: optical observation
  5. GRB020812: optical observation
  6. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  7. SGR1900+14 burst localized by HETE
  8. GRB020813: High-resolution optical spectroscopy
  9. GRB020819: optical observations at Bisei
  10. GRB020812: negative optical observations
  11. GRB 020812: optical observation at Kyoto University
  12. Second epoch K band imaging of GRB 020819
  13. GRB020813, Baade 6.5m data now available
  14. GRB 020813 : HST observations
  15. Confirming no variability for GRB02081
  16. GRB 020812: early time optical observation at Ouda Station
  17. GRB020813: VRI Decay Slopes
  18. GRB020813: Magellan BVRI Photometry
  19. GRB 020819 : OT candidate - confirmation of non variability
  20. GRB 020819: Optical observations
  21. K band observation of GRB 020819
  22. GRB020819: optical observations
  23. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  24. HETE 2275: Optical observations
  25. GRB020813: optical and NIR observations
  26. GRB020813: Fading X-ray Afterglow Observed with Chandra
  27. GRB020813, UBVRI field calibration
  28. GRB 020813: addendum to GCN 1498
  29. GRB020813: optical observations at Bisei
  30. GRB020813: V-band decay slope
  31. GRB020812: NIR observations
  32. Polarimetry of GRB020813: evidence for variability
  33. GRB020813 IRAM millimeter observations
  34. GRB020813: High-Resolution Optical Observations
  35. GRB020813(=H2262): Revised Localization with HETE SXC
  36. GRB 020812: optical observation at Bisei
  37. GRB020813: Early Time Magnitude
  38. GRB020813: optical observations; possible host galaxy
  39. GRB 020813, radio detection
  40. GRB 020812 : optical afterglow candidate
  41. GRB020813, optical observations
  42. Millimeter observation of GRB 020813
  43. GRB020812: optical observations
  44. GRB 020813 : KISO multiband optical observations
  45. GRB020813, optical observations
  46. IPN error box for GRB020813
  47. IPN triangulation of GRB020813
  48. GRB020812: possible afterglow candidate
  49. Early Time Limits for GRB020813
  50. GRB020812: possible afterglow candidate
  51. GRB020813, astrometric position
  52. Spectropolarimetry of GRB 020813
  53. GRB 020813 Afterglow Observations; Possible break
  54. GRB 020813: Absorption redshift
  55. GRB 020813 multiband optical observations
  56. GRB020813: optical afterglow
  57. GRB020813: Fading of Candidate OT
  58. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  59. GRB020813: Candidate Optical Afterglow
  60. GRB 020812 optical observation
  61. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  62. GRB 020715, optical observations
  63. GRB 020714, optical observations
  64. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  65. GRB020801: Candidate OT present in DSS
  66. HST Imaging of the Host of GRB 011121
  67. GRB020801, optical afterglow candidate
  68. Further refinement to IPN error box for GRB020531
  69. GRB020331: Late-time Optical Light Curve (re-submission)
  70. GRB020331: Late-time Optical Light Curve
  71. GRB 020405: HST observations reveal red bump
  72. IPN triangulation of GRB020714
  73. IPN triangulation of GRB020715 (=GRB150702)
  74. GRB 020410: Discovery of Probable OT by HST
  75. GRB 020124, HST observations of the fading afterglow
  76. IPN triangulation of GRB020708
  77. IPN triangulation of GRB020708
  78. IPN error box for GRB020706
  79. Correction to IPN error box for GRB020706
  80. IPN triangulation of GRB020706
  81. GRB 020625, optical observations
  82. GRB 020531: optical photometry of Chandra sources
  83. GRB020625 (=H2081): A Long Burst Localized by HETE
  84. HETE #2081: Optical observations
  85. The Probable Host Galaxy of GRB/XRF 020427
  86. GRB/XRF 020427, detection of an underlying system with the VLT
  87. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  88. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  89. AXP 1E2259+586: quasi-simultaneous optical observation
  90. AXP 1E2259+586 optical observations
  91. Fading Optical Source in the Field of GRB020531
  92. GRB 020531, INT+WFC deep optical upper limits
  93. SGR-like Bursts from the AXP 1E 2259+586
  94. GRB020405: polarimetric observations
  95. GRB 020531, simultaneous optical observations
  96. GRB 020604, optical observations
  97. GRB 020531/Candidate Redshift
  98. GRB020531: Detection of Candidate Host Galaxy
  99. GRB020531: Second epoch Chandra observations
  100. GRB020604, optical observations

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