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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.

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

32495 results found.

  1. GRB020813 IRAM millimeter observations
  2. GRB020813: High-Resolution Optical Observations
  3. GRB020813(=H2262): Revised Localization with HETE SXC
  4. GRB 020812: optical observation at Bisei
  5. GRB020813: Early Time Magnitude
  6. GRB020813: optical observations; possible host galaxy
  7. GRB 020813, radio detection
  8. GRB020813, optical observations
  9. Millimeter observation of GRB 020813
  10. GRB020812: optical observations
  11. GRB 020813 : KISO multiband 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. GRB020813, astrometric position
  18. Spectropolarimetry of GRB 020813
  19. GRB 020813 Afterglow Observations; Possible break
  20. GRB 020813: Absorption redshift
  21. GRB020813: optical afterglow
  22. GRB020813: Fading of Candidate OT
  23. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  24. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  25. GRB 020715, optical observations
  26. GRB 020714, optical observations
  27. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  28. GRB020801: Candidate OT present in DSS
  29. Further refinement to IPN error box for GRB020531
  30. GRB020331: Late-time Optical Light Curve (re-submission)
  31. GRB020331: Late-time Optical Light Curve
  32. GRB 020405: HST observations reveal red bump
  33. IPN triangulation of GRB020714
  34. IPN triangulation of GRB020715 (=GRB150702)
  35. GRB 020410: Discovery of Probable OT by HST
  36. GRB 020124, HST observations of the fading afterglow
  37. IPN triangulation of GRB020708
  38. IPN triangulation of GRB020708
  39. IPN error box for GRB020706
  40. Correction to IPN error box for GRB020706
  41. IPN triangulation of GRB020706
  42. GRB 020625, optical observations
  43. GRB 020531: optical photometry of Chandra sources
  44. GRB020625 (=H2081): A Long Burst Localized by HETE
  45. The Probable Host Galaxy of GRB/XRF 020427
  46. GRB/XRF 020427, detection of an underlying system with the VLT
  47. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  48. AXP 1E2259+586: quasi-simultaneous optical observation
  49. AXP 1E2259+586 optical observations
  50. Fading Optical Source in the Field of GRB020531
  51. GRB 020531, INT+WFC deep optical upper limits
  52. GRB020405: polarimetric observations
  53. GRB 020531, simultaneous optical observations
  54. GRB 020604, optical observations
  55. GRB 020531/Candidate Redshift
  56. GRB020531: Detection of Candidate Host Galaxy
  57. GRB020531: Second epoch Chandra observations
  58. GRB020604, optical observations
  59. GRB020604, BVRcIc field photometry
  60. GRB020603, BVRcIc field observations
  61. GRB020531, BVRcIc field photometry
  62. GRB020531 Optical observations with TAROT
  63. GRB020531 Optical observations with TAROT
  64. GRB 020531, Radio Observations
  65. GRB020531 Optical Observations
  66. GRB 020603: Optical Observations
  67. GRB 020603, R-band observation
  68. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  69. GRB020531: Upper Limit for Detection of Two TAROT Sources
  70. GRB 020603: Optical observations
  71. GRB 020531 optical observations with TAROT
  72. Refined IPN error box for GRB020531
  73. GRB020531, optical observations
  74. GRB020531: optical observations
  75. GRB020531(=H2042): Optical Observations
  76. IPN triangulation of the short, hard GRB020531 (=H2042)
  77. GRB020531(=H2042): Optical Observations
  78. GRB020531: Optical observations
  79. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  80. GRB 020525: Optical Observations
  81. GRB020525, optical observations
  82. IPN detection of possible bursts from SGR1806-20
  83. XRF 020427: Sudden Ionospheric Disturbance (SID)
  84. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  85. GRB/XRF 020427, Radio Observations
  86. HST detection of the likely host galaxy of GRB 020124
  87. GRB020405 field photometry at ESO
  88. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  89. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  90. GRB020321 : Optical observations.
  91. GRB020331: Third Epoch and Revised Second Epoch Optical
  92. GRB 020410, Radio Observations
  93. GRB 020418: Optical observations
  94. GRB 020124: Optical observations
  95. GRB 020418: Optical observations
  96. GRB020405: VLT observations of the OT environment
  97. GRB020410: BeppoSAX NFI observations refined analysis
  98. GRB 020409: Optical Observations
  99. Mars Odyssey joins the IPN
  100. GRB 020409, 2-nd epoch optical observations at Terskol.

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