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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"

38360 results found.

  1. GRB020812: NIR observations
  2. GRB020813 IRAM millimeter observations
  3. GRB020813: High-Resolution Optical Observations
  4. GRB020813(=H2262): Revised Localization with HETE SXC
  5. GRB020813: Early Time Magnitude
  6. GRB020813: optical observations; possible host galaxy
  7. GRB 020813, radio detection
  8. GRB 020812 : optical afterglow candidate
  9. GRB020813, optical observations
  10. Millimeter observation of GRB 020813
  11. GRB020812: optical observations
  12. GRB020813, optical observations
  13. IPN error box for GRB020813
  14. IPN triangulation of GRB020813
  15. GRB020812: possible afterglow candidate
  16. Early Time Limits for GRB020813
  17. GRB020812: possible afterglow candidate
  18. GRB020813, astrometric position
  19. Spectropolarimetry of GRB 020813
  20. GRB 020813: Absorption redshift
  21. GRB 020813 multiband optical observations
  22. GRB020813: optical afterglow
  23. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  24. GRB 020812 optical observation
  25. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  26. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  27. GRB020801, optical afterglow candidate
  28. Further refinement to IPN error box for GRB020531
  29. GRB020331: Late-time Optical Light Curve (re-submission)
  30. GRB020331: Late-time Optical Light Curve
  31. GRB 020405: HST observations reveal red bump
  32. IPN triangulation of GRB020714
  33. IPN triangulation of GRB020715 (=GRB150702)
  34. IPN triangulation of GRB020714
  35. IPN triangulation of GRB150702
  36. GRB 020410: Discovery of Probable OT by HST
  37. GRB 020124, HST observations of the fading afterglow
  38. IPN triangulation of GRB020708
  39. IPN triangulation of GRB020708
  40. IPN error box for GRB020706
  41. IPN triangulation of GRB020706
  42. GRB 020705: 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. HETE #2081: Optical observations
  47. The Probable Host Galaxy of GRB/XRF 020427
  48. GRB/XRF 020427, detection of an underlying system with the VLT
  49. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  50. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  51. AXP 1E2259+586 optical observations
  52. Fading Optical Source in the Field of GRB020531
  53. GRB 020531, INT+WFC deep optical upper limits
  54. GRB020405: polarimetric observations
  55. GRB 020531, simultaneous optical observations
  56. GRB 020604, optical observations
  57. GRB 020531/Candidate Redshift
  58. GRB020531: Detection of Candidate Host Galaxy
  59. GRB020531: Second epoch Chandra observations
  60. GRB020604, optical observations
  61. GRB020604, BVRcIc field photometry
  62. GRB020603, BVRcIc field observations
  63. GRB020531, BVRcIc field photometry
  64. GRB020531 Optical observations with TAROT
  65. GRB020531 Optical observations with TAROT
  66. GRB 020418, optical/near-IR observations
  67. GRB 020531, Radio Observations
  68. IPN triangulation of GRB020604
  69. GRB020531 Optical Observations
  70. GRB020531: Observations with the Chandra X-ray Observatory
  71. GRB 020603, R-band observation
  72. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  73. GRB020531: Upper Limit for Detection of Two TAROT Sources
  74. GRB 020603: Optical observations
  75. IPN triangulation of GRB020603 (possible short/hard GRB)
  76. GRB 020531 optical observations with TAROT
  77. Refined IPN error box for GRB020531
  78. GRB020531, optical observations
  79. GRB020531: optical observations
  80. GRB020531, optical observation
  81. GRB020531(=H2042): Optical Observations
  82. IPN triangulation of the short, hard GRB020531 (=H2042)
  83. GRB020531(=H2042): Optical Observations
  84. GRB020531: Optical observations
  85. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  86. GRB020525, optical observations
  87. IPN detection of possible bursts from SGR1806-20
  88. IPN triangulation of GRB020525
  89. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  90. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  91. IPN triangulation of a burst from SGR1806-20
  92. GRB/XRF 020427, Radio Observations
  93. HST detection of the likely host galaxy of GRB 020124
  94. GRB020405 field photometry at ESO
  95. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  96. GRB020321 : Optical observations.
  97. GRB020427 BeppoSAX NFI Observation
  98. XRF 020427
  99. GRB020331: Third Epoch and Revised Second Epoch Optical
  100. The end of BSAX GRB activities

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