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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"

36149 results found.

  1. IPN triangulation of GRB020708
  2. IPN error box for GRB020706
  3. IPN triangulation of GRB020706
  4. GRB 020705: Optical observations
  5. GRB 020625, optical observations
  6. GRB 020625: Optical observations
  7. GRB 020531: optical photometry of Chandra sources
  8. GRB020625 (=H2081): A Long Burst Localized by HETE
  9. The Probable Host Galaxy of GRB/XRF 020427
  10. GRB/XRF 020427, detection of an underlying system with the VLT
  11. GRB 020531, INT+WFC deep optical upper limits
  12. GRB020405: polarimetric observations
  13. GRB 020531, simultaneous optical observations
  14. GRB 020604, optical observations
  15. GRB 020531/Candidate Redshift
  16. GRB020531: Second epoch Chandra observations
  17. GRB020604, optical observations
  18. GRB020604, BVRcIc field photometry
  19. GRB020603, BVRcIc field observations
  20. GRB020531, BVRcIc field photometry
  21. GRB020531 Optical observations with TAROT
  22. GRB020531 Optical observations with TAROT
  23. GRB 020418, optical/near-IR observations
  24. GRB 020531, Radio Observations
  25. IPN triangulation of GRB020604
  26. GRB020531: Observations with the Chandra X-ray Observatory
  27. GRB 020603: Optical Observations
  28. GRB 020603, R-band observation
  29. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  30. GRB 020603: Optical observations
  31. IPN triangulation of GRB020603 (possible short/hard GRB)
  32. GRB 020531 optical observations with TAROT
  33. Refined IPN error box for GRB020531
  34. GRB020531, optical observations
  35. GRB020531(=H2042): Optical Observations
  36. IPN triangulation of the short, hard GRB020531 (=H2042)
  37. GRB020531(=H2042): Optical Observations
  38. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  39. GRB 020525: Optical Observations
  40. GRB020525, optical observations
  41. IPN detection of possible bursts from SGR1806-20
  42. IPN triangulation of GRB020525
  43. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  44. IPN triangulation of a burst from SGR1806-20
  45. GRB/XRF 020427, Radio Observations
  46. HST detection of the likely host galaxy of GRB 020124
  47. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  48. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  49. GRB020321 : Optical observations.
  50. GRB020427 BeppoSAX NFI Observation
  51. XRF 020427
  52. GRB020331: Third Epoch and Revised Second Epoch Optical
  53. The end of BSAX GRB activities
  54. GRB 020410, Radio Observations
  55. GRB 020418: Optical observations
  56. GRB 020124: Optical observations
  57. GRB 020418: Optical observations
  58. IPN triangulation of GRB020418
  59. GRB020405: VLT observations of the OT environment
  60. GRB020410: BeppoSAX NFI observations refined analysis
  61. GRB 020409: Optical Observations
  62. Mars Odyssey joins the IPN
  63. IPN triangulation of GRB020413
  64. GRB 020409, 2-nd epoch optical observations at Terskol.
  65. GRB 020409: Optical observations
  66. GRB 020409, No Optical Detection to R = 22
  67. GRB 020409: No Evidence for an Optical Afterglow
  68. GRB 020409, 2nd epoch optical observations
  69. GRB 020331 Kyoto observation on March 31
  70. GRB 020409
  71. GRB 020409 SARA Observations
  72. GRB "020411"
  73. GRB 020409, No Optical Detection to R = 20
  74. GRB020410: BeppoSAX NFI observation
  75. GRB 020409: Optical observations
  76. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  77. GRB 020410, optical observations
  78. BeppoSAX ALERT: possible GRB020411
  79. GRB 020409, optical observations
  80. GRB 020409: Optical Observations
  81. GRB020406(?), optical observations
  82. GRB020410, optical observations
  83. BeppoSAX ALERT: possible GRB020410
  84. X-ray afterglow of GRB020321
  85. BeppoSAX GRB : GRB020409
  86. GRB020405: VLT optical observations and V band decay slope
  87. GRB020331 optical observations with RIMOTS
  88. GRB020124 optical observations with RIBOTS/RIMOTS
  89. GRB 020321: Candidate X-ray Counterparts
  90. ASM GRB candidate 020406 refined error box
  91. GRB 020405: Moderate-resolution spectroscopy
  92. GRB020406(?), optical observations
  93. GRB020405: VLT optical observations
  94. Revised Photometry of the Optical Afterglow of GRB 020405
  95. GRB020405: OT observations
  96. GRB 020331: Candidate Optical Afterglow
  97. GRB 020405: Decay index
  98. Short RXTE/ASM transient 020406; may be a GRB
  99. GRB020405, Radio Observations
  100. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405

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