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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"

36188 results found.

  1. Polarimetry of GRB020813: evidence for variability
  2. GRB020813 IRAM millimeter observations
  3. GRB020812: optical observations
  4. GRB 020812: optical observation at Bisei
  5. GRB020813: optical observations; possible host galaxy
  6. GRB 020813, radio detection
  7. GRB 020812 : optical afterglow candidate
  8. Millimeter observation of GRB 020813
  9. GRB020812: optical observations
  10. GRB 020813 : KISO multiband optical observations
  11. IPN error box for GRB020813
  12. IPN triangulation of GRB020813
  13. GRB020812: possible afterglow candidate
  14. Early Time Limits for GRB020813
  15. GRB020812: possible afterglow candidate
  16. GRB020813, astrometric position
  17. Spectropolarimetry of GRB 020813
  18. GRB 020813 Afterglow Observations; Possible break
  19. GRB 020813: Absorption redshift
  20. GRB 020813 multiband optical observations
  21. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  22. GRB 020812 optical observation
  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. HST Imaging of the Host of GRB 011121
  28. GRB020801, optical afterglow candidate
  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. IPN triangulation of GRB020714
  36. IPN triangulation of GRB150702
  37. GRB 020410: Discovery of Probable OT by HST
  38. GRB 020124, HST observations of the fading afterglow
  39. IPN triangulation of GRB020708
  40. IPN triangulation of GRB020708
  41. IPN error box for GRB020706
  42. IPN triangulation of GRB020706
  43. GRB 020705: Optical observations
  44. GRB 020625, optical observations
  45. GRB 020625: Optical observations
  46. GRB 020531: optical photometry of Chandra sources
  47. GRB020625 (=H2081): A Long Burst Localized by HETE
  48. The Probable Host Galaxy of GRB/XRF 020427
  49. GRB/XRF 020427, detection of an underlying system with the VLT
  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: Second epoch Chandra observations
  56. GRB020604, optical observations
  57. GRB020604, BVRcIc field photometry
  58. GRB020603, BVRcIc field observations
  59. GRB020531, BVRcIc field photometry
  60. GRB020531 Optical observations with TAROT
  61. GRB020531 Optical observations with TAROT
  62. GRB 020418, optical/near-IR observations
  63. GRB 020531, Radio Observations
  64. IPN triangulation of GRB020604
  65. GRB020531: Observations with the Chandra X-ray Observatory
  66. GRB 020603: Optical Observations
  67. GRB 020603, R-band observation
  68. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  69. GRB 020603: Optical observations
  70. IPN triangulation of GRB020603 (possible short/hard GRB)
  71. GRB 020531 optical observations with TAROT
  72. Refined IPN error box for GRB020531
  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(=H2042): A Short, Hard Burst Localized by HETE
  78. GRB 020525: Optical Observations
  79. GRB020525, optical observations
  80. IPN detection of possible bursts from SGR1806-20
  81. IPN triangulation of GRB020525
  82. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  83. IPN triangulation of a burst from SGR1806-20
  84. GRB/XRF 020427, Radio Observations
  85. HST detection of the likely host galaxy of GRB 020124
  86. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  87. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  88. GRB020321 : Optical observations.
  89. GRB020427 BeppoSAX NFI Observation
  90. XRF 020427
  91. GRB020331: Third Epoch and Revised Second Epoch Optical
  92. The end of BSAX GRB activities
  93. GRB 020410, Radio Observations
  94. GRB 020418: Optical observations
  95. GRB 020124: Optical observations
  96. GRB 020418: Optical observations
  97. IPN triangulation of GRB020418
  98. GRB020405: VLT observations of the OT environment
  99. GRB020410: BeppoSAX NFI observations refined analysis
  100. GRB 020409: Optical Observations

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