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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"

39198 results found.

  1. GRB 020813 : KISO multiband optical observations
  2. IPN error box for GRB020813
  3. IPN triangulation of GRB020813
  4. GRB020812: possible afterglow candidate
  5. Early Time Limits for GRB020813
  6. GRB020812: possible afterglow candidate
  7. GRB020813, astrometric position
  8. Spectropolarimetry of GRB 020813
  9. GRB 020813 Afterglow Observations; Possible break
  10. GRB 020813: Absorption redshift
  11. GRB 020813 multiband optical observations
  12. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  13. GRB 020812 optical observation
  14. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  15. GRB 020715, optical observations
  16. GRB 020714, optical observations
  17. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  18. HST Imaging of the Host of GRB 011121
  19. GRB020801, optical afterglow candidate
  20. Further refinement to IPN error box for GRB020531
  21. GRB020331: Late-time Optical Light Curve (re-submission)
  22. GRB020331: Late-time Optical Light Curve
  23. GRB 020405: HST observations reveal red bump
  24. IPN triangulation of GRB020714
  25. IPN triangulation of GRB020715 (=GRB150702)
  26. IPN triangulation of GRB020714
  27. IPN triangulation of GRB150702
  28. GRB 020410: Discovery of Probable OT by HST
  29. GRB 020124, HST observations of the fading afterglow
  30. IPN triangulation of GRB020708
  31. IPN triangulation of GRB020708
  32. IPN error box for GRB020706
  33. IPN triangulation of GRB020706
  34. GRB 020705: Optical observations
  35. GRB 020625, optical observations
  36. GRB 020625: Optical observations
  37. GRB 020531: optical photometry of Chandra sources
  38. GRB020625 (=H2081): A Long Burst Localized by HETE
  39. The Probable Host Galaxy of GRB/XRF 020427
  40. GRB/XRF 020427, detection of an underlying system with the VLT
  41. GRB 020531, INT+WFC deep optical upper limits
  42. GRB020405: polarimetric observations
  43. GRB 020531, simultaneous optical observations
  44. GRB 020604, optical observations
  45. GRB 020531/Candidate Redshift
  46. GRB020531: Second epoch Chandra observations
  47. GRB020604, optical observations
  48. GRB020604, BVRcIc field photometry
  49. GRB020603, BVRcIc field observations
  50. GRB020531, BVRcIc field photometry
  51. GRB020531 Optical observations with TAROT
  52. GRB020531 Optical observations with TAROT
  53. GRB 020418, optical/near-IR observations
  54. GRB 020531, Radio Observations
  55. IPN triangulation of GRB020604
  56. GRB020531: Observations with the Chandra X-ray Observatory
  57. GRB 020603: Optical Observations
  58. GRB 020603, R-band observation
  59. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  60. GRB 020603: Optical observations
  61. IPN triangulation of GRB020603 (possible short/hard GRB)
  62. GRB 020531 optical observations with TAROT
  63. Refined IPN error box for GRB020531
  64. GRB020531, optical observations
  65. GRB020531(=H2042): Optical Observations
  66. IPN triangulation of the short, hard GRB020531 (=H2042)
  67. GRB020531(=H2042): Optical Observations
  68. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  69. GRB 020525: Optical Observations
  70. GRB020525, optical observations
  71. IPN detection of possible bursts from SGR1806-20
  72. IPN triangulation of GRB020525
  73. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  74. IPN triangulation of a burst from SGR1806-20
  75. GRB/XRF 020427, Radio Observations
  76. HST detection of the likely host galaxy of GRB 020124
  77. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  78. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  79. GRB020321 : Optical observations.
  80. GRB020427 BeppoSAX NFI Observation
  81. XRF 020427
  82. GRB020331: Third Epoch and Revised Second Epoch Optical
  83. The end of BSAX GRB activities
  84. GRB 020410, Radio Observations
  85. GRB 020418: Optical observations
  86. GRB 020124: Optical observations
  87. GRB 020418: Optical observations
  88. IPN triangulation of GRB020418
  89. GRB020405: VLT observations of the OT environment
  90. GRB020410: BeppoSAX NFI observations refined analysis
  91. GRB 020409: Optical Observations
  92. Mars Odyssey joins the IPN
  93. IPN triangulation of GRB020413
  94. GRB 020409, 2-nd epoch optical observations at Terskol.
  95. GRB 020409: Optical observations
  96. GRB 020409, No Optical Detection to R = 22
  97. GRB020410: second BeppoSAX NFI observation
  98. GRB 020409: No Evidence for an Optical Afterglow
  99. GRB 020409, 2nd epoch optical observations
  100. GRB 020331 Kyoto observation on March 31

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