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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"

42617 results found.

  1. GRB020813: optical observation
  2. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  3. SGR1900+14 burst localized by HETE
  4. GRB020813: High-resolution optical spectroscopy
  5. GRB020819: optical observations at Bisei
  6. GRB020812: negative optical observations
  7. GRB 020812: optical observation at Kyoto University
  8. Second epoch K band imaging of GRB 020819
  9. GRB020813, Baade 6.5m data now available
  10. GRB 020813 : HST observations
  11. Confirming no variability for GRB02081
  12. GRB020819 : Optical observations at KISO
  13. GRB 020812: early time optical observation at Ouda Station
  14. GRB020813: VRI Decay Slopes
  15. GRB020813: Magellan BVRI Photometry
  16. GRB 020819 : OT candidate - confirmation of non variability
  17. GRB 020819: Optical observations
  18. K band observation of GRB 020819
  19. GRB020819: optical observations
  20. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  21. IPN triangulation of GRB020819 (HETE 2275)
  22. HETE 2275: Optical observations
  23. GRB020813: optical and NIR observations
  24. GRB020813: Fading X-ray Afterglow Observed with Chandra
  25. GRB020813, UBVRI field calibration
  26. GRB 020813: addendum to GCN 1498
  27. GRB020813: optical observations at Bisei
  28. GRB020813: V-band decay slope
  29. GRB020812: NIR observations
  30. Polarimetry of GRB020813: evidence for variability
  31. GRB020813 IRAM millimeter observations
  32. GRB020812: optical observations
  33. GRB020813: High-Resolution Optical Observations
  34. GRB020813(=H2262): Revised Localization with HETE SXC
  35. GRB 020812: optical observation at Bisei
  36. GRB020813: Early Time Magnitude
  37. GRB020813: optical observations; possible host galaxy
  38. GRB 020813, radio detection
  39. GRB 020812 : optical afterglow candidate
  40. GRB020813, optical observations
  41. Millimeter observation of GRB 020813
  42. GRB020812: optical observations
  43. GRB 020813 : KISO multiband optical observations
  44. GRB020813, optical observations
  45. IPN error box for GRB020813
  46. IPN triangulation of GRB020813
  47. GRB020812: possible afterglow candidate
  48. Early Time Limits for GRB020813
  49. GRB020812: possible afterglow candidate
  50. GRB020813, astrometric position
  51. Spectropolarimetry of GRB 020813
  52. GRB 020813 Afterglow Observations; Possible break
  53. GRB 020813: Absorption redshift
  54. GRB 020813 multiband optical observations
  55. GRB020813: optical afterglow
  56. GRB020813: Fading of Candidate OT
  57. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  58. GRB020813: Candidate Optical Afterglow
  59. GRB 020812 optical observation
  60. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  61. GRB 020715, optical observations
  62. GRB 020714, optical observations
  63. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  64. GRB020801: Candidate OT present in DSS
  65. HST Imaging of the Host of GRB 011121
  66. GRB020801, optical afterglow candidate
  67. Further refinement to IPN error box for GRB020531
  68. GRB020331: Late-time Optical Light Curve (re-submission)
  69. GRB020331: Late-time Optical Light Curve
  70. GRB 020405: HST observations reveal red bump
  71. IPN triangulation of GRB020715 (=GRB150702)
  72. IPN triangulation of GRB020714
  73. IPN triangulation of 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 triangulation of GRB020706
  79. GRB 020705: Optical observations
  80. GRB 020625: Optical observations
  81. GRB 020531: optical photometry of Chandra sources
  82. GRB020625 (=H2081): A Long Burst Localized by HETE
  83. HETE #2081: Optical observations
  84. The Probable Host Galaxy of GRB/XRF 020427
  85. GRB/XRF 020427, detection of an underlying system with the VLT
  86. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  87. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  88. AXP 1E2259+586: quasi-simultaneous optical observation
  89. AXP 1E2259+586 optical observations
  90. Fading Optical Source in the Field of GRB020531
  91. GRB 020531, INT+WFC deep optical upper limits
  92. SGR-like Bursts from the AXP 1E 2259+586
  93. GRB020405: polarimetric observations
  94. GRB 020531, simultaneous optical observations
  95. GRB 020604, optical observations
  96. GRB 020531/Candidate Redshift
  97. GRB020531: Detection of Candidate Host Galaxy
  98. GRB020531: Second epoch Chandra observations
  99. GRB020604, optical observations
  100. GRB020604, BVRcIc field photometry

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