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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.

Advanced Search Examples (click to copy):

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

35957 results found.

  1. GRB020801, optical afterglow candidate
  2. Further refinement to IPN error box for GRB020531
  3. GRB020331: Late-time Optical Light Curve (re-submission)
  4. GRB020331: Late-time Optical Light Curve
  5. GRB 020405: HST observations reveal red bump
  6. IPN triangulation of GRB020714
  7. IPN triangulation of GRB020715 (=GRB150702)
  8. IPN triangulation of GRB020714
  9. IPN triangulation of GRB150702
  10. GRB 020410: Discovery of Probable OT by HST
  11. GRB 020124, HST observations of the fading afterglow
  12. IPN triangulation of GRB020708
  13. IPN triangulation of GRB020708
  14. IPN error box for GRB020706
  15. IPN triangulation of GRB020706
  16. GRB 020705: Optical observations
  17. GRB 020625, optical observations
  18. GRB 020625: Optical observations
  19. GRB 020531: optical photometry of Chandra sources
  20. GRB020625 (=H2081): A Long Burst Localized by HETE
  21. The Probable Host Galaxy of GRB/XRF 020427
  22. GRB/XRF 020427, detection of an underlying system with the VLT
  23. GRB 020531, INT+WFC deep optical upper limits
  24. GRB020405: polarimetric observations
  25. GRB 020531, simultaneous optical observations
  26. GRB 020604, optical observations
  27. GRB 020531/Candidate Redshift
  28. GRB020531: Second epoch Chandra observations
  29. GRB020604, optical observations
  30. GRB020604, BVRcIc field photometry
  31. GRB020603, BVRcIc field observations
  32. GRB020531, BVRcIc field photometry
  33. GRB020531 Optical observations with TAROT
  34. GRB020531 Optical observations with TAROT
  35. GRB 020418, optical/near-IR observations
  36. GRB 020531, Radio Observations
  37. IPN triangulation of GRB020604
  38. GRB020531: Observations with the Chandra X-ray Observatory
  39. GRB 020603: Optical Observations
  40. GRB 020603, R-band observation
  41. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  42. GRB 020603: Optical observations
  43. IPN triangulation of GRB020603 (possible short/hard GRB)
  44. GRB 020531 optical observations with TAROT
  45. Refined IPN error box for GRB020531
  46. GRB020531, optical observations
  47. GRB020531(=H2042): Optical Observations
  48. IPN triangulation of the short, hard GRB020531 (=H2042)
  49. GRB020531(=H2042): Optical Observations
  50. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  51. GRB 020525: Optical Observations
  52. GRB020525, optical observations
  53. IPN detection of possible bursts from SGR1806-20
  54. IPN triangulation of GRB020525
  55. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  56. IPN triangulation of a burst from SGR1806-20
  57. GRB/XRF 020427, Radio Observations
  58. HST detection of the likely host galaxy of GRB 020124
  59. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  60. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  61. GRB020321 : Optical observations.
  62. GRB020427 BeppoSAX NFI Observation
  63. XRF 020427
  64. GRB020331: Third Epoch and Revised Second Epoch Optical
  65. The end of BSAX GRB activities
  66. GRB 020410, Radio Observations
  67. GRB 020418: Optical observations
  68. GRB 020124: Optical observations
  69. GRB 020418: Optical observations
  70. IPN triangulation of GRB020418
  71. GRB020405: VLT observations of the OT environment
  72. GRB020410: BeppoSAX NFI observations refined analysis
  73. GRB 020409: Optical Observations
  74. Mars Odyssey joins the IPN
  75. IPN triangulation of GRB020413
  76. GRB 020409, 2-nd epoch optical observations at Terskol.
  77. GRB 020409: Optical observations
  78. GRB 020409, No Optical Detection to R = 22
  79. GRB 020409: No Evidence for an Optical Afterglow
  80. GRB 020409, 2nd epoch optical observations
  81. GRB 020331 Kyoto observation on March 31
  82. GRB 020409
  83. GRB 020409 SARA Observations
  84. GRB "020411"
  85. GRB 020409, No Optical Detection to R = 20
  86. GRB020410: BeppoSAX NFI observation
  87. GRB 020409: Optical observations
  88. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  89. GRB 020410, optical observations
  90. BeppoSAX ALERT: possible GRB020411
  91. GRB 020409, optical observations
  92. GRB 020409: Optical Observations
  93. GRB020406(?), optical observations
  94. GRB020410, optical observations
  95. BeppoSAX ALERT: possible GRB020410
  96. X-ray afterglow of GRB020321
  97. BeppoSAX GRB : GRB020409
  98. GRB020405: VLT optical observations and V band decay slope
  99. GRB020331 optical observations with RIMOTS
  100. GRB020124 optical observations with RIBOTS/RIMOTS

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