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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"

32494 results found.

  1. GRB020813: High-Resolution Optical Observations
  2. GRB020813(=H2262): Revised Localization with HETE SXC
  3. GRB 020812: optical observation at Bisei
  4. GRB020813: Early Time Magnitude
  5. GRB020813: optical observations; possible host galaxy
  6. GRB 020813, radio detection
  7. GRB020813, optical observations
  8. Millimeter observation of GRB 020813
  9. GRB020812: optical observations
  10. GRB 020813 : KISO multiband optical observations
  11. GRB020813, optical observations
  12. IPN error box for GRB020813
  13. IPN triangulation of GRB020813
  14. GRB020812: possible afterglow candidate
  15. Early Time Limits for GRB020813
  16. GRB020813, astrometric position
  17. Spectropolarimetry of GRB 020813
  18. GRB 020813 Afterglow Observations; Possible break
  19. GRB 020813: Absorption redshift
  20. GRB020813: optical afterglow
  21. GRB020813: Fading of Candidate OT
  22. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  23. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  24. GRB 020715, optical observations
  25. GRB 020714, optical observations
  26. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  27. GRB020801: Candidate OT present in DSS
  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. GRB 020410: Discovery of Probable OT by HST
  35. GRB 020124, HST observations of the fading afterglow
  36. IPN triangulation of GRB020708
  37. IPN triangulation of GRB020708
  38. IPN error box for GRB020706
  39. Correction to IPN error box for GRB020706
  40. IPN triangulation of GRB020706
  41. GRB 020625, optical observations
  42. GRB 020531: optical photometry of Chandra sources
  43. GRB020625 (=H2081): A Long Burst Localized by HETE
  44. The Probable Host Galaxy of GRB/XRF 020427
  45. GRB/XRF 020427, detection of an underlying system with the VLT
  46. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  47. AXP 1E2259+586: quasi-simultaneous optical observation
  48. AXP 1E2259+586 optical observations
  49. Fading Optical Source in the Field of GRB020531
  50. GRB 020531, INT+WFC deep optical upper limits
  51. GRB020405: polarimetric observations
  52. GRB 020531, simultaneous optical observations
  53. GRB 020604, optical observations
  54. GRB 020531/Candidate Redshift
  55. GRB020531: Detection of Candidate Host Galaxy
  56. GRB020531: Second epoch Chandra observations
  57. GRB020604, optical observations
  58. GRB020604, BVRcIc field photometry
  59. GRB020603, BVRcIc field observations
  60. GRB020531, BVRcIc field photometry
  61. GRB020531 Optical observations with TAROT
  62. GRB020531 Optical observations with TAROT
  63. GRB 020531, Radio Observations
  64. GRB020531 Optical Observations
  65. GRB 020603: Optical Observations
  66. GRB 020603, R-band observation
  67. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  68. GRB020531: Upper Limit for Detection of Two TAROT Sources
  69. GRB 020603: Optical observations
  70. GRB 020531 optical observations with TAROT
  71. Refined IPN error box for GRB020531
  72. GRB020531, optical observations
  73. GRB020531: optical observations
  74. GRB020531(=H2042): Optical Observations
  75. IPN triangulation of the short, hard GRB020531 (=H2042)
  76. GRB020531(=H2042): Optical Observations
  77. GRB020531: Optical observations
  78. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  79. GRB 020525: Optical Observations
  80. GRB020525, optical observations
  81. IPN detection of possible bursts from SGR1806-20
  82. XRF 020427: Sudden Ionospheric Disturbance (SID)
  83. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  84. GRB/XRF 020427, Radio Observations
  85. HST detection of the likely host galaxy of GRB 020124
  86. GRB020405 field photometry at ESO
  87. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  88. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  89. GRB020321 : Optical observations.
  90. GRB020331: Third Epoch and Revised Second Epoch Optical
  91. GRB 020410, Radio Observations
  92. GRB 020418: Optical observations
  93. GRB 020124: Optical observations
  94. GRB 020418: Optical observations
  95. GRB020405: VLT observations of the OT environment
  96. GRB020410: BeppoSAX NFI observations refined analysis
  97. GRB 020409: Optical Observations
  98. Mars Odyssey joins the IPN
  99. GRB 020409, 2-nd epoch optical observations at Terskol.
  100. GRB020405: predicted break

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