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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

36082 results found.

  1. GRB020812: optical observations
  2. GRB 020812: optical observation at Bisei
  3. GRB020813: optical observations; possible host galaxy
  4. GRB 020813, radio detection
  5. GRB 020812 : optical afterglow candidate
  6. Millimeter observation of GRB 020813
  7. GRB020812: optical observations
  8. GRB 020813 : KISO multiband optical observations
  9. IPN error box for GRB020813
  10. IPN triangulation of GRB020813
  11. GRB020812: possible afterglow candidate
  12. Early Time Limits for GRB020813
  13. GRB020812: possible afterglow candidate
  14. GRB020813, astrometric position
  15. Spectropolarimetry of GRB 020813
  16. GRB 020813 Afterglow Observations; Possible break
  17. GRB 020813: Absorption redshift
  18. GRB 020813 multiband optical observations
  19. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  20. GRB 020812 optical observation
  21. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  22. GRB 020715, optical observations
  23. GRB 020714, optical observations
  24. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  25. HST Imaging of the Host of GRB 011121
  26. GRB020801, optical afterglow candidate
  27. Further refinement to IPN error box for GRB020531
  28. GRB020331: Late-time Optical Light Curve (re-submission)
  29. GRB020331: Late-time Optical Light Curve
  30. GRB 020405: HST observations reveal red bump
  31. IPN triangulation of GRB020714
  32. IPN triangulation of GRB020715 (=GRB150702)
  33. IPN triangulation of GRB020714
  34. IPN triangulation of GRB150702
  35. GRB 020410: Discovery of Probable OT by HST
  36. GRB 020124, HST observations of the fading afterglow
  37. IPN triangulation of GRB020708
  38. IPN triangulation of GRB020708
  39. IPN error box for GRB020706
  40. IPN triangulation of GRB020706
  41. GRB 020705: Optical observations
  42. GRB 020625, optical observations
  43. GRB 020625: Optical observations
  44. GRB 020531: optical photometry of Chandra sources
  45. GRB020625 (=H2081): A Long Burst Localized by HETE
  46. The Probable Host Galaxy of GRB/XRF 020427
  47. GRB/XRF 020427, detection of an underlying system with the VLT
  48. GRB 020531, INT+WFC deep optical upper limits
  49. GRB020405: polarimetric observations
  50. GRB 020531, simultaneous optical observations
  51. GRB 020604, optical observations
  52. GRB 020531/Candidate Redshift
  53. GRB020531: Second epoch Chandra observations
  54. GRB020604, optical observations
  55. GRB020604, BVRcIc field photometry
  56. GRB020603, BVRcIc field observations
  57. GRB020531, BVRcIc field photometry
  58. GRB020531 Optical observations with TAROT
  59. GRB020531 Optical observations with TAROT
  60. GRB 020418, optical/near-IR observations
  61. GRB 020531, Radio Observations
  62. IPN triangulation of GRB020604
  63. GRB020531: Observations with the Chandra X-ray Observatory
  64. GRB 020603: Optical Observations
  65. GRB 020603, R-band observation
  66. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  67. GRB 020603: Optical observations
  68. IPN triangulation of GRB020603 (possible short/hard GRB)
  69. GRB 020531 optical observations with TAROT
  70. Refined IPN error box for GRB020531
  71. GRB020531, optical observations
  72. GRB020531(=H2042): Optical Observations
  73. IPN triangulation of the short, hard GRB020531 (=H2042)
  74. GRB020531(=H2042): Optical Observations
  75. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  76. GRB 020525: Optical Observations
  77. GRB020525, optical observations
  78. IPN detection of possible bursts from SGR1806-20
  79. IPN triangulation of GRB020525
  80. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  81. IPN triangulation of a burst from SGR1806-20
  82. GRB/XRF 020427, Radio Observations
  83. HST detection of the likely host galaxy of GRB 020124
  84. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  85. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  86. GRB020321 : Optical observations.
  87. GRB020427 BeppoSAX NFI Observation
  88. XRF 020427
  89. GRB020331: Third Epoch and Revised Second Epoch Optical
  90. The end of BSAX GRB activities
  91. GRB 020410, Radio Observations
  92. GRB 020418: Optical observations
  93. GRB 020124: Optical observations
  94. GRB 020418: Optical observations
  95. IPN triangulation of GRB020418
  96. GRB020405: VLT observations of the OT environment
  97. GRB020410: BeppoSAX NFI observations refined analysis
  98. GRB 020409: Optical Observations
  99. Mars Odyssey joins the IPN
  100. IPN triangulation of GRB020413

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