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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"

32500 results found.

  1. GRB 020813: addendum to GCN 1498
  2. GRB020813: optical observations at Bisei
  3. GRB020813: V-band decay slope
  4. GRB020812: NIR observations
  5. Polarimetry of GRB020813: evidence for variability
  6. GRB020813 IRAM millimeter observations
  7. GRB020813: High-Resolution Optical Observations
  8. GRB020813(=H2262): Revised Localization with HETE SXC
  9. GRB 020812: optical observation at Bisei
  10. GRB020813: Early Time Magnitude
  11. GRB020813: optical observations; possible host galaxy
  12. GRB 020813, radio detection
  13. GRB020813, optical observations
  14. Millimeter observation of GRB 020813
  15. GRB020812: optical observations
  16. GRB 020813 : KISO multiband optical observations
  17. GRB020813, optical observations
  18. IPN error box for GRB020813
  19. IPN triangulation of GRB020813
  20. GRB020812: possible afterglow candidate
  21. Early Time Limits for GRB020813
  22. GRB020813, astrometric position
  23. Spectropolarimetry of GRB 020813
  24. GRB 020813 Afterglow Observations; Possible break
  25. GRB 020813: Absorption redshift
  26. GRB020813: optical afterglow
  27. GRB020813: Fading of Candidate OT
  28. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  29. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  30. GRB 020715, optical observations
  31. GRB 020714, optical observations
  32. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  33. GRB020801: Candidate OT present in DSS
  34. Further refinement to IPN error box for GRB020531
  35. GRB020331: Late-time Optical Light Curve (re-submission)
  36. GRB020331: Late-time Optical Light Curve
  37. GRB 020405: HST observations reveal red bump
  38. IPN triangulation of GRB020714
  39. IPN triangulation of GRB020715 (=GRB150702)
  40. GRB 020410: Discovery of Probable OT by HST
  41. GRB 020124, HST observations of the fading afterglow
  42. IPN triangulation of GRB020708
  43. IPN triangulation of GRB020708
  44. IPN error box for GRB020706
  45. Correction to IPN error box for GRB020706
  46. IPN triangulation of GRB020706
  47. GRB 020625, optical observations
  48. GRB 020531: optical photometry of Chandra sources
  49. GRB020625 (=H2081): A Long Burst Localized by HETE
  50. The Probable Host Galaxy of GRB/XRF 020427
  51. GRB/XRF 020427, detection of an underlying system with the VLT
  52. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  53. AXP 1E2259+586: quasi-simultaneous optical observation
  54. AXP 1E2259+586 optical observations
  55. Fading Optical Source in the Field of GRB020531
  56. GRB 020531, INT+WFC deep optical upper limits
  57. GRB020405: polarimetric observations
  58. GRB 020531, simultaneous optical observations
  59. GRB 020604, optical observations
  60. GRB 020531/Candidate Redshift
  61. GRB020531: Detection of Candidate Host Galaxy
  62. GRB020531: Second epoch Chandra observations
  63. GRB020604, optical observations
  64. GRB020604, BVRcIc field photometry
  65. GRB020603, BVRcIc field observations
  66. GRB020531, BVRcIc field photometry
  67. GRB020531 Optical observations with TAROT
  68. GRB020531 Optical observations with TAROT
  69. GRB 020531, Radio Observations
  70. GRB020531 Optical Observations
  71. GRB 020603: Optical Observations
  72. GRB 020603, R-band observation
  73. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  74. GRB020531: Upper Limit for Detection of Two TAROT Sources
  75. GRB 020603: Optical observations
  76. GRB 020531 optical observations with TAROT
  77. Refined IPN error box for GRB020531
  78. GRB020531, optical observations
  79. GRB020531: optical observations
  80. GRB020531(=H2042): Optical Observations
  81. IPN triangulation of the short, hard GRB020531 (=H2042)
  82. GRB020531(=H2042): Optical Observations
  83. GRB020531: Optical observations
  84. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  85. GRB 020525: Optical Observations
  86. GRB020525, optical observations
  87. IPN detection of possible bursts from SGR1806-20
  88. XRF 020427: Sudden Ionospheric Disturbance (SID)
  89. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  90. GRB/XRF 020427, Radio Observations
  91. HST detection of the likely host galaxy of GRB 020124
  92. GRB020405 field photometry at ESO
  93. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  94. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  95. GRB020321 : Optical observations.
  96. GRB020331: Third Epoch and Revised Second Epoch Optical
  97. GRB 020410, Radio Observations
  98. GRB 020418: Optical observations
  99. GRB 020124: Optical observations
  100. GRB 020418: Optical observations

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