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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"

36361 results found.

  1. IPN triangulation of GRB020914 - clarification and additional information
  2. IPN triangulation of GRB020914
  3. GRB 020305: HST/STIS observations
  4. Confirmation of IPN error box for GRB020910
  5. IPN triangulation of GRB020910
  6. IPN GCN Circulars now to be issued without restriction
  7. Single IPN error box for GRB020904
  8. XRF 020903: optical observation at Kyoto
  9. GRB020322 : HST/STIS observations
  10. IPN triangulation of GRB020904
  11. IPN detection of a burst from SGR1900+14
  12. INTEGRAL GRBs added to GCN
  13. SGR1900+14 burst localized by HETE
  14. GRB020813: High-resolution optical spectroscopy
  15. GRB 020812: optical observation at Kyoto University
  16. Second epoch K band imaging of GRB 020819
  17. GRB020813, Baade 6.5m data now available
  18. GRB 020813 : HST observations
  19. Confirming no variability for GRB02081
  20. GRB020819 : Optical observations at KISO
  21. GRB 020812: early time optical observation at Ouda Station
  22. GRB020813: VRI Decay Slopes
  23. GRB 020819 : OT candidate - confirmation of non variability
  24. GRB 020819: Optical observations
  25. K band observation of GRB 020819
  26. GRB020819: optical observations
  27. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  28. IPN triangulation of GRB020819 (HETE 2275)
  29. GRB020813, UBVRI field calibration
  30. GRB 020813: addendum to GCN 1498
  31. GRB020813: optical observations at Bisei
  32. GRB020813: V-band decay slope
  33. Polarimetry of GRB020813: evidence for variability
  34. GRB020813 IRAM millimeter observations
  35. GRB020812: optical observations
  36. GRB020813: High-Resolution Optical Observations
  37. GRB 020812: optical observation at Bisei
  38. GRB020813: Early Time Magnitude
  39. GRB020813: optical observations; possible host galaxy
  40. GRB 020813, radio detection
  41. GRB 020812 : optical afterglow candidate
  42. Millimeter observation of GRB 020813
  43. GRB020812: optical observations
  44. GRB 020813 : KISO multiband optical observations
  45. IPN error box for GRB020813
  46. IPN triangulation of GRB020813
  47. GRB020812: possible afterglow candidate
  48. Early Time Limits for GRB020813
  49. GRB020812: possible afterglow candidate
  50. GRB020813, astrometric position
  51. Spectropolarimetry of GRB 020813
  52. GRB 020813 Afterglow Observations; Possible break
  53. GRB 020813: Absorption redshift
  54. GRB 020813 multiband optical observations
  55. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  56. GRB 020812 optical observation
  57. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  58. GRB 020715, optical observations
  59. GRB 020714, optical observations
  60. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  61. HST Imaging of the Host of GRB 011121
  62. GRB020801, optical afterglow candidate
  63. Further refinement to IPN error box for GRB020531
  64. GRB020331: Late-time Optical Light Curve (re-submission)
  65. GRB020331: Late-time Optical Light Curve
  66. GRB 020405: HST observations reveal red bump
  67. IPN triangulation of GRB020714
  68. IPN triangulation of GRB020715 (=GRB150702)
  69. IPN triangulation of GRB020714
  70. IPN triangulation of GRB150702
  71. GRB 020410: Discovery of Probable OT by HST
  72. GRB 020124, HST observations of the fading afterglow
  73. IPN triangulation of GRB020708
  74. IPN triangulation of GRB020708
  75. IPN error box for GRB020706
  76. IPN triangulation of GRB020706
  77. GRB 020705: Optical observations
  78. GRB 020625, optical observations
  79. GRB 020625: Optical observations
  80. GRB 020531: optical photometry of Chandra sources
  81. GRB020625 (=H2081): A Long Burst Localized by HETE
  82. The Probable Host Galaxy of GRB/XRF 020427
  83. GRB/XRF 020427, detection of an underlying system with the VLT
  84. GRB 020531, INT+WFC deep optical upper limits
  85. GRB020405: polarimetric observations
  86. GRB 020531, simultaneous optical observations
  87. GRB 020604, optical observations
  88. GRB 020531/Candidate Redshift
  89. GRB020531: Second epoch Chandra observations
  90. GRB020604, optical observations
  91. GRB020604, BVRcIc field photometry
  92. GRB020603, BVRcIc field observations
  93. GRB020531, BVRcIc field photometry
  94. GRB020531 Optical observations with TAROT
  95. GRB020531 Optical observations with TAROT
  96. GRB 020418, optical/near-IR observations
  97. GRB 020531, Radio Observations
  98. IPN triangulation of GRB020604
  99. GRB020531 Optical Observations
  100. GRB020531: Observations with the Chandra X-ray Observatory

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