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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"

35952 results found.

  1. IPN triangulation of GRB020714
  2. IPN triangulation of GRB020715 (=GRB150702)
  3. IPN triangulation of GRB020714
  4. IPN triangulation of GRB150702
  5. GRB 020410: Discovery of Probable OT by HST
  6. GRB 020124, HST observations of the fading afterglow
  7. IPN triangulation of GRB020708
  8. IPN triangulation of GRB020708
  9. IPN error box for GRB020706
  10. IPN triangulation of GRB020706
  11. GRB 020705: Optical observations
  12. GRB 020625, optical observations
  13. GRB 020625: Optical observations
  14. GRB 020531: optical photometry of Chandra sources
  15. GRB020625 (=H2081): A Long Burst Localized by HETE
  16. The Probable Host Galaxy of GRB/XRF 020427
  17. GRB/XRF 020427, detection of an underlying system with the VLT
  18. GRB 020531, INT+WFC deep optical upper limits
  19. GRB020405: polarimetric observations
  20. GRB 020531, simultaneous optical observations
  21. GRB 020604, optical observations
  22. GRB 020531/Candidate Redshift
  23. GRB020531: Second epoch Chandra observations
  24. GRB020604, optical observations
  25. GRB020604, BVRcIc field photometry
  26. GRB020603, BVRcIc field observations
  27. GRB020531, BVRcIc field photometry
  28. GRB020531 Optical observations with TAROT
  29. GRB020531 Optical observations with TAROT
  30. GRB 020418, optical/near-IR observations
  31. GRB 020531, Radio Observations
  32. IPN triangulation of GRB020604
  33. GRB020531: Observations with the Chandra X-ray Observatory
  34. GRB 020603: Optical Observations
  35. GRB 020603, R-band observation
  36. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  37. GRB 020603: Optical observations
  38. IPN triangulation of GRB020603 (possible short/hard GRB)
  39. GRB 020531 optical observations with TAROT
  40. Refined IPN error box for GRB020531
  41. GRB020531, optical observations
  42. GRB020531(=H2042): Optical Observations
  43. IPN triangulation of the short, hard GRB020531 (=H2042)
  44. GRB020531(=H2042): Optical Observations
  45. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  46. GRB 020525: Optical Observations
  47. GRB020525, optical observations
  48. IPN detection of possible bursts from SGR1806-20
  49. IPN triangulation of GRB020525
  50. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  51. IPN triangulation of a burst from SGR1806-20
  52. GRB/XRF 020427, Radio Observations
  53. HST detection of the likely host galaxy of GRB 020124
  54. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  55. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  56. GRB020321 : Optical observations.
  57. GRB020427 BeppoSAX NFI Observation
  58. XRF 020427
  59. GRB020331: Third Epoch and Revised Second Epoch Optical
  60. The end of BSAX GRB activities
  61. GRB 020410, Radio Observations
  62. GRB 020418: Optical observations
  63. GRB 020124: Optical observations
  64. GRB 020418: Optical observations
  65. IPN triangulation of GRB020418
  66. GRB020405: VLT observations of the OT environment
  67. GRB020410: BeppoSAX NFI observations refined analysis
  68. GRB 020409: Optical Observations
  69. Mars Odyssey joins the IPN
  70. IPN triangulation of GRB020413
  71. GRB 020409, 2-nd epoch optical observations at Terskol.
  72. GRB 020409: Optical observations
  73. GRB 020409, No Optical Detection to R = 22
  74. GRB 020409: No Evidence for an Optical Afterglow
  75. GRB 020409, 2nd epoch optical observations
  76. GRB 020331 Kyoto observation on March 31
  77. GRB 020409
  78. GRB 020409 SARA Observations
  79. GRB "020411"
  80. GRB 020409, No Optical Detection to R = 20
  81. GRB020410: BeppoSAX NFI observation
  82. GRB 020409: Optical observations
  83. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  84. GRB 020410, optical observations
  85. BeppoSAX ALERT: possible GRB020411
  86. GRB 020409, optical observations
  87. GRB 020409: Optical Observations
  88. GRB020406(?), optical observations
  89. GRB020410, optical observations
  90. BeppoSAX ALERT: possible GRB020410
  91. X-ray afterglow of GRB020321
  92. BeppoSAX GRB : GRB020409
  93. GRB020405: VLT optical observations and V band decay slope
  94. GRB020331 optical observations with RIMOTS
  95. GRB020124 optical observations with RIBOTS/RIMOTS
  96. GRB 020321: Candidate X-ray Counterparts
  97. ASM GRB candidate 020406 refined error box
  98. GRB 020405: Moderate-resolution spectroscopy
  99. GRB020406(?), optical observations
  100. GRB020405: VLT optical observations

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