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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"

23415 results found.

  1. IPN triangulation of GRB020914B
  2. Improved IPN position for GRB020918 (two large error boxes)
  3. IPN triangulation of GRB020918 (annulus)
  4. IPN triangulation of GRB020911 (2 large error boxes)
  5. IPN triangulation of GRB020914 - clarification and additional information
  6. IPN triangulation of GRB020914
  7. GRB 020305: HST/STIS observations
  8. Confirmation of IPN error box for GRB020910
  9. IPN triangulation of GRB020910
  10. IPN GCN Circulars now to be issued without restriction
  11. Single IPN error box for GRB020904
  12. XRF 020903: optical observation at Kyoto
  13. GRB020322 : HST/STIS observations
  14. XRF 020903: Optical observations
  15. IPN triangulation of GRB020904
  16. IPN detection of a burst from SGR1900+14
  17. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  18. INTEGRAL GRBs added to GCN
  19. GRB020813: optical observation
  20. GRB020812: optical observation
  21. GRB020813: High-resolution optical spectroscopy
  22. GRB020819: optical observations at Bisei
  23. GRB020812: negative optical observations
  24. GRB 020812: optical observation at Kyoto University
  25. Second epoch K band imaging of GRB 020819
  26. GRB 020813 : HST observations
  27. Confirming no variability for GRB02081
  28. GRB 020812: early time optical observation at Ouda Station
  29. GRB020813: Magellan BVRI Photometry
  30. GRB 020819: Optical observations
  31. IPN triangulation of GRB020819 (HETE 2275)
  32. GRB020813: optical and NIR observations
  33. GRB020813: Fading X-ray Afterglow Observed with Chandra
  34. GRB020813, UBVRI field calibration
  35. GRB 020813: addendum to GCN 1498
  36. GRB020812: NIR observations
  37. Polarimetry of GRB020813: evidence for variability
  38. GRB020812: optical observations
  39. GRB020813: High-Resolution Optical Observations
  40. GRB 020812: optical observation at Bisei
  41. GRB020813: Early Time Magnitude
  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. GRB020812: possible afterglow candidate
  48. GRB020812: possible afterglow candidate
  49. GRB020813, astrometric position
  50. GRB 020812 optical observation
  51. GRB 020715, optical observations
  52. GRB 020714, optical observations
  53. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  54. HST Imaging of the Host of GRB 011121
  55. GRB020801, optical afterglow candidate
  56. GRB020331: Late-time Optical Light Curve (re-submission)
  57. GRB020331: Late-time Optical Light Curve
  58. IPN triangulation of GRB020714
  59. IPN triangulation of GRB020715 (=GRB150702)
  60. IPN triangulation of GRB020714
  61. IPN triangulation of GRB150702
  62. GRB 020410: Discovery of Probable OT by HST
  63. GRB 020124, HST observations of the fading afterglow
  64. IPN triangulation of GRB020708
  65. IPN triangulation of GRB020708
  66. Correction to IPN error box for GRB020706
  67. IPN triangulation of GRB020706
  68. GRB 020705: Optical observations
  69. GRB 020625: Optical observations
  70. GRB 020531: optical photometry of Chandra sources
  71. The Probable Host Galaxy of GRB/XRF 020427
  72. GRB/XRF 020427, detection of an underlying system with the VLT
  73. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  74. AXP 1E2259+586 optical observations
  75. Fading Optical Source in the Field of GRB020531
  76. GRB 020531, INT+WFC deep optical upper limits
  77. GRB020405: polarimetric observations
  78. GRB 020531, simultaneous optical observations
  79. GRB 020604, optical observations
  80. GRB020531: Second epoch Chandra observations
  81. GRB020604, optical observations
  82. GRB020604, BVRcIc field photometry
  83. GRB020603, BVRcIc field observations
  84. GRB020531, BVRcIc field photometry
  85. GRB020531 Optical observations with TAROT
  86. GRB020531 Optical observations with TAROT
  87. GRB 020531, Radio Observations
  88. IPN triangulation of GRB020604
  89. GRB020531 Optical Observations
  90. GRB020531: Observations with the Chandra X-ray Observatory
  91. GRB020531: Upper Limit for Detection of Two TAROT Sources
  92. IPN triangulation of GRB020603 (possible short/hard GRB)
  93. Refined IPN error box for GRB020531
  94. GRB020531, optical observations
  95. GRB020531(=H2042): Optical Observations
  96. IPN triangulation of the short, hard GRB020531 (=H2042)
  97. GRB020531(=H2042): Optical Observations
  98. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  99. GRB020525, optical observations
  100. IPN triangulation of GRB020525

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