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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').
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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

32537 results found.

  1. Improved IPN position for GRB020918 (two large error boxes)
  2. IPN annulus for GRB020914B
  3. IPN triangulation of GRB020914 - clarification and additional information
  4. IPN triangulation of GRB020914
  5. GRB 020305: HST/STIS observations
  6. Confirmation of IPN error box for GRB020910
  7. IPN GCN Circulars now to be issued without restriction
  8. Single IPN error box for GRB020904
  9. XRF 020903: optical observation at Kyoto
  10. GRB020322 : HST/STIS observations
  11. XRF 020903: Optical observations
  12. IPN triangulation of GRB020904
  13. XRF 020903: Optical observations
  14. XRF 020903, optical observations
  15. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  16. INTEGRAL GRBs added to GCN
  17. GRB020813: optical observation
  18. GRB020812: optical observation
  19. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  20. GRB020813: High-resolution optical spectroscopy
  21. GRB020819: optical observations at Bisei
  22. GRB020812: negative optical observations
  23. GRB 020812: optical observation at Kyoto University
  24. Second epoch K band imaging of GRB 020819
  25. GRB020813, Baade 6.5m data now available
  26. GRB 020813 : HST observations
  27. Confirming no variability for GRB02081
  28. GRB 020812: early time optical observation at Ouda Station
  29. GRB020813: VRI Decay Slopes
  30. GRB 020819 : OT candidate - confirmation of non variability
  31. GRB 020819: Optical observations
  32. K band observation of GRB 020819
  33. GRB020819: optical observations
  34. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  35. HETE 2275: Optical observations
  36. GRB020813: optical and NIR observations
  37. GRB020813, UBVRI field calibration
  38. GRB 020813: addendum to GCN 1498
  39. GRB020813: optical observations at Bisei
  40. GRB020813: V-band decay slope
  41. GRB020812: NIR observations
  42. Polarimetry of GRB020813: evidence for variability
  43. GRB020813 IRAM millimeter observations
  44. GRB020813: High-Resolution Optical Observations
  45. GRB020813(=H2262): Revised Localization with HETE SXC
  46. GRB 020812: optical observation at Bisei
  47. GRB020813: Early Time Magnitude
  48. GRB020813: optical observations; possible host galaxy
  49. GRB 020813, radio detection
  50. GRB020813, optical observations
  51. Millimeter observation of GRB 020813
  52. GRB020812: optical observations
  53. GRB 020813 : KISO multiband optical observations
  54. GRB020813, optical observations
  55. IPN error box for GRB020813
  56. IPN triangulation of GRB020813
  57. GRB020812: possible afterglow candidate
  58. Early Time Limits for GRB020813
  59. GRB020813, astrometric position
  60. Spectropolarimetry of GRB 020813
  61. GRB 020813 Afterglow Observations; Possible break
  62. GRB 020813: Absorption redshift
  63. GRB020813: optical afterglow
  64. GRB020813: Fading of Candidate OT
  65. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  66. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  67. GRB 020715, optical observations
  68. GRB 020714, optical observations
  69. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  70. GRB020801: Candidate OT present in DSS
  71. Further refinement to IPN error box for GRB020531
  72. GRB020331: Late-time Optical Light Curve (re-submission)
  73. GRB020331: Late-time Optical Light Curve
  74. GRB 020405: HST observations reveal red bump
  75. IPN triangulation of GRB020714
  76. IPN triangulation of GRB020715 (=GRB150702)
  77. GRB 020410: Discovery of Probable OT by HST
  78. GRB 020124, HST observations of the fading afterglow
  79. IPN triangulation of GRB020708
  80. IPN triangulation of GRB020708
  81. IPN error box for GRB020706
  82. Correction to IPN error box for GRB020706
  83. IPN triangulation of GRB020706
  84. GRB 020625, optical observations
  85. GRB 020531: optical photometry of Chandra sources
  86. GRB020625 (=H2081): A Long Burst Localized by HETE
  87. The Probable Host Galaxy of GRB/XRF 020427
  88. GRB/XRF 020427, detection of an underlying system with the VLT
  89. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  90. AXP 1E2259+586: quasi-simultaneous optical observation
  91. AXP 1E2259+586 optical observations
  92. Fading Optical Source in the Field of GRB020531
  93. GRB 020531, INT+WFC deep optical upper limits
  94. GRB020405: polarimetric observations
  95. GRB 020531, simultaneous optical observations
  96. GRB 020604, optical observations
  97. GRB 020531/Candidate Redshift
  98. GRB020531: Detection of Candidate Host Galaxy
  99. GRB020531: Second epoch Chandra observations
  100. GRB020604, optical observations

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