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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"

36208 results found.

  1. INTEGRAL GRBs added to GCN
  2. GRB020813: High-resolution optical spectroscopy
  3. GRB 020812: optical observation at Kyoto University
  4. Second epoch K band imaging of GRB 020819
  5. GRB020813, Baade 6.5m data now available
  6. GRB 020813 : HST observations
  7. Confirming no variability for GRB02081
  8. GRB020819 : Optical observations at KISO
  9. GRB 020812: early time optical observation at Ouda Station
  10. GRB020813: VRI Decay Slopes
  11. GRB 020819 : OT candidate - confirmation of non variability
  12. GRB 020819: Optical observations
  13. K band observation of GRB 020819
  14. GRB020819: optical observations
  15. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  16. IPN triangulation of GRB020819 (HETE 2275)
  17. GRB020813, UBVRI field calibration
  18. GRB 020813: addendum to GCN 1498
  19. GRB020813: optical observations at Bisei
  20. GRB020813: V-band decay slope
  21. Polarimetry of GRB020813: evidence for variability
  22. GRB020813 IRAM millimeter observations
  23. GRB020812: optical observations
  24. GRB 020812: optical observation at Bisei
  25. GRB020813: optical observations; possible host galaxy
  26. GRB 020813, radio detection
  27. GRB 020812 : optical afterglow candidate
  28. Millimeter observation of GRB 020813
  29. GRB020812: optical observations
  30. GRB 020813 : KISO multiband optical observations
  31. IPN error box for GRB020813
  32. IPN triangulation of GRB020813
  33. GRB020812: possible afterglow candidate
  34. Early Time Limits for GRB020813
  35. GRB020812: possible afterglow candidate
  36. GRB020813, astrometric position
  37. Spectropolarimetry of GRB 020813
  38. GRB 020813 Afterglow Observations; Possible break
  39. GRB 020813: Absorption redshift
  40. GRB 020813 multiband optical observations
  41. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  42. GRB 020812 optical observation
  43. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  44. GRB 020715, optical observations
  45. GRB 020714, optical observations
  46. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  47. HST Imaging of the Host of GRB 011121
  48. GRB020801, optical afterglow candidate
  49. Further refinement to IPN error box for GRB020531
  50. GRB020331: Late-time Optical Light Curve (re-submission)
  51. GRB020331: Late-time Optical Light Curve
  52. GRB 020405: HST observations reveal red bump
  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. IPN error box for GRB020706
  62. IPN triangulation of GRB020706
  63. GRB 020705: Optical observations
  64. GRB 020625, optical observations
  65. GRB 020625: Optical observations
  66. GRB 020531: optical photometry of Chandra sources
  67. GRB020625 (=H2081): A Long Burst Localized by HETE
  68. The Probable Host Galaxy of GRB/XRF 020427
  69. GRB/XRF 020427, detection of an underlying system with the VLT
  70. GRB 020531, INT+WFC deep optical upper limits
  71. GRB020405: polarimetric observations
  72. GRB 020531, simultaneous optical observations
  73. GRB 020604, optical observations
  74. GRB 020531/Candidate Redshift
  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 020418, optical/near-IR observations
  83. GRB 020531, Radio Observations
  84. IPN triangulation of GRB020604
  85. GRB020531: Observations with the Chandra X-ray Observatory
  86. GRB 020603: Optical Observations
  87. GRB 020603, R-band observation
  88. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  89. GRB 020603: Optical observations
  90. IPN triangulation of GRB020603 (possible short/hard GRB)
  91. GRB 020531 optical observations with TAROT
  92. Refined IPN error box for GRB020531
  93. GRB020531, optical observations
  94. GRB020531(=H2042): Optical Observations
  95. IPN triangulation of the short, hard GRB020531 (=H2042)
  96. GRB020531(=H2042): Optical Observations
  97. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  98. GRB 020525: Optical Observations
  99. GRB020525, optical observations
  100. IPN detection of possible bursts from SGR1806-20

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