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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"

23410 results found.

  1. IPN triangulation of GRB020914
  2. GRB 020305: HST/STIS observations
  3. Confirmation of IPN error box for GRB020910
  4. IPN triangulation of GRB020910
  5. IPN GCN Circulars now to be issued without restriction
  6. Single IPN error box for GRB020904
  7. XRF 020903: optical observation at Kyoto
  8. GRB020322 : HST/STIS observations
  9. XRF 020903: Optical observations
  10. IPN triangulation of GRB020904
  11. IPN detection of a burst from SGR1900+14
  12. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  13. INTEGRAL GRBs added to GCN
  14. GRB020813: optical observation
  15. GRB020812: optical observation
  16. GRB020813: High-resolution optical spectroscopy
  17. GRB020819: optical observations at Bisei
  18. GRB020812: negative optical observations
  19. GRB 020812: optical observation at Kyoto University
  20. Second epoch K band imaging of GRB 020819
  21. GRB 020813 : HST observations
  22. Confirming no variability for GRB02081
  23. GRB 020812: early time optical observation at Ouda Station
  24. GRB020813: Magellan BVRI Photometry
  25. GRB 020819: Optical observations
  26. IPN triangulation of GRB020819 (HETE 2275)
  27. GRB020813: optical and NIR observations
  28. GRB020813: Fading X-ray Afterglow Observed with Chandra
  29. GRB020813, UBVRI field calibration
  30. GRB 020813: addendum to GCN 1498
  31. GRB020812: NIR observations
  32. Polarimetry of GRB020813: evidence for variability
  33. GRB020812: optical observations
  34. GRB020813: High-Resolution Optical Observations
  35. GRB 020812: optical observation at Bisei
  36. GRB020813: Early Time Magnitude
  37. Millimeter observation of GRB 020813
  38. GRB020812: optical observations
  39. GRB 020813 : KISO multiband optical observations
  40. GRB020813, optical observations
  41. IPN error box for GRB020813
  42. GRB020812: possible afterglow candidate
  43. GRB020812: possible afterglow candidate
  44. GRB020813, astrometric position
  45. GRB 020812 optical observation
  46. GRB 020715, optical observations
  47. GRB 020714, optical observations
  48. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  49. HST Imaging of the Host of GRB 011121
  50. GRB020801, optical afterglow candidate
  51. GRB020331: Late-time Optical Light Curve (re-submission)
  52. GRB020331: Late-time Optical Light Curve
  53. IPN triangulation of GRB020714
  54. IPN triangulation of GRB020715 (=GRB150702)
  55. IPN triangulation of GRB020714
  56. IPN triangulation of GRB150702
  57. GRB 020410: Discovery of Probable OT by HST
  58. GRB 020124, HST observations of the fading afterglow
  59. IPN triangulation of GRB020708
  60. IPN triangulation of GRB020708
  61. Correction to IPN error box for GRB020706
  62. IPN triangulation of GRB020706
  63. GRB 020705: Optical observations
  64. GRB 020625: Optical observations
  65. GRB 020531: optical photometry of Chandra sources
  66. The Probable Host Galaxy of GRB/XRF 020427
  67. GRB/XRF 020427, detection of an underlying system with the VLT
  68. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  69. AXP 1E2259+586 optical observations
  70. Fading Optical Source in the Field of GRB020531
  71. GRB 020531, INT+WFC deep optical upper limits
  72. GRB020405: polarimetric observations
  73. GRB 020531, simultaneous optical observations
  74. GRB 020604, optical observations
  75. GRB020531: Second epoch Chandra observations
  76. GRB020604, optical observations
  77. GRB020604, BVRcIc field photometry
  78. GRB020603, BVRcIc field observations
  79. GRB020531, BVRcIc field photometry
  80. GRB020531 Optical observations with TAROT
  81. GRB020531 Optical observations with TAROT
  82. GRB 020531, Radio Observations
  83. IPN triangulation of GRB020604
  84. GRB020531 Optical Observations
  85. GRB020531: Observations with the Chandra X-ray Observatory
  86. GRB020531: Upper Limit for Detection of Two TAROT Sources
  87. IPN triangulation of GRB020603 (possible short/hard GRB)
  88. Refined IPN error box for GRB020531
  89. GRB020531, optical observations
  90. GRB020531(=H2042): Optical Observations
  91. IPN triangulation of the short, hard GRB020531 (=H2042)
  92. GRB020531(=H2042): Optical Observations
  93. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  94. GRB020525, optical observations
  95. IPN triangulation of GRB020525
  96. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  97. HST detection of the likely host galaxy of GRB 020124
  98. GRB020405 field photometry at ESO
  99. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  100. GRB(XRF) 020427: X-ray afterglow with BeppoSAX

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