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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"

38001 results found.

  1. Second epoch K band imaging of GRB 020819
  2. GRB020813, Baade 6.5m data now available
  3. GRB 020813 : HST observations
  4. Confirming no variability for GRB02081
  5. GRB020819 : Optical observations at KISO
  6. GRB 020812: early time optical observation at Ouda Station
  7. GRB020813: VRI Decay Slopes
  8. GRB 020819 : OT candidate - confirmation of non variability
  9. GRB 020819: Optical observations
  10. K band observation of GRB 020819
  11. GRB020819: optical observations
  12. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  13. IPN triangulation of GRB020819 (HETE 2275)
  14. GRB020813, UBVRI field calibration
  15. GRB 020813: addendum to GCN 1498
  16. GRB020813: optical observations at Bisei
  17. GRB020813: V-band decay slope
  18. Polarimetry of GRB020813: evidence for variability
  19. GRB020813 IRAM millimeter observations
  20. GRB020812: optical observations
  21. GRB 020812: optical observation at Bisei
  22. GRB020813: optical observations; possible host galaxy
  23. GRB 020813, radio detection
  24. GRB 020812 : optical afterglow candidate
  25. Millimeter observation of GRB 020813
  26. GRB020812: optical observations
  27. GRB 020813 : KISO multiband optical observations
  28. IPN error box for GRB020813
  29. IPN triangulation of GRB020813
  30. GRB020812: possible afterglow candidate
  31. Early Time Limits for GRB020813
  32. GRB020812: possible afterglow candidate
  33. GRB020813, astrometric position
  34. Spectropolarimetry of GRB 020813
  35. GRB 020813 Afterglow Observations; Possible break
  36. GRB 020813: Absorption redshift
  37. GRB 020813 multiband optical observations
  38. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  39. GRB 020812 optical observation
  40. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  41. GRB 020715, optical observations
  42. GRB 020714, optical observations
  43. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  44. HST Imaging of the Host of GRB 011121
  45. GRB020801, optical afterglow candidate
  46. Further refinement to IPN error box for GRB020531
  47. GRB020331: Late-time Optical Light Curve (re-submission)
  48. GRB020331: Late-time Optical Light Curve
  49. GRB 020405: HST observations reveal red bump
  50. IPN triangulation of GRB020714
  51. IPN triangulation of GRB020715 (=GRB150702)
  52. IPN triangulation of GRB020714
  53. IPN triangulation of GRB150702
  54. GRB 020410: Discovery of Probable OT by HST
  55. GRB 020124, HST observations of the fading afterglow
  56. IPN triangulation of GRB020708
  57. IPN triangulation of GRB020708
  58. IPN error box for GRB020706
  59. IPN triangulation of GRB020706
  60. GRB 020705: Optical observations
  61. GRB 020625, optical observations
  62. GRB 020625: Optical observations
  63. GRB 020531: optical photometry of Chandra sources
  64. GRB020625 (=H2081): A Long Burst Localized by HETE
  65. The Probable Host Galaxy of GRB/XRF 020427
  66. GRB/XRF 020427, detection of an underlying system with the VLT
  67. GRB 020531, INT+WFC deep optical upper limits
  68. GRB020405: polarimetric observations
  69. GRB 020531, simultaneous optical observations
  70. GRB 020604, optical observations
  71. GRB 020531/Candidate Redshift
  72. GRB020531: Second epoch Chandra observations
  73. GRB020604, optical observations
  74. GRB020604, BVRcIc field photometry
  75. GRB020603, BVRcIc field observations
  76. GRB020531, BVRcIc field photometry
  77. GRB020531 Optical observations with TAROT
  78. GRB020531 Optical observations with TAROT
  79. GRB 020418, optical/near-IR observations
  80. GRB 020531, Radio Observations
  81. IPN triangulation of GRB020604
  82. GRB020531: Observations with the Chandra X-ray Observatory
  83. GRB 020603: Optical Observations
  84. GRB 020603, R-band observation
  85. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  86. GRB 020603: Optical observations
  87. IPN triangulation of GRB020603 (possible short/hard GRB)
  88. GRB 020531 optical observations with TAROT
  89. Refined IPN error box for GRB020531
  90. GRB020531, optical observations
  91. GRB020531(=H2042): Optical Observations
  92. IPN triangulation of the short, hard GRB020531 (=H2042)
  93. GRB020531(=H2042): Optical Observations
  94. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  95. GRB 020525: Optical Observations
  96. GRB020525, optical observations
  97. IPN detection of possible bursts from SGR1806-20
  98. IPN triangulation of GRB020525
  99. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  100. IPN triangulation of a burst from SGR1806-20

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