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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"

45452 results found.

  1. GRB020813: Candidate Optical Afterglow
  2. GRB 020812 optical observation
  3. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  4. GRB 020715, optical observations
  5. GRB 020714, optical observations
  6. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  7. GRB020801: Candidate OT present in DSS
  8. HST Imaging of the Host of GRB 011121
  9. GRB020801, optical afterglow candidate
  10. Further refinement to IPN error box for GRB020531
  11. GRB020331: Late-time Optical Light Curve (re-submission)
  12. GRB020331: Late-time Optical Light Curve
  13. GRB 020405: HST observations reveal red bump
  14. IPN triangulation of GRB020714
  15. IPN triangulation of GRB020715 (=GRB150702)
  16. IPN triangulation of GRB020714
  17. IPN triangulation of GRB150702
  18. GRB 020410: Discovery of Probable OT by HST
  19. GRB 020124, HST observations of the fading afterglow
  20. IPN triangulation of GRB020708
  21. IPN triangulation of GRB020708
  22. IPN error box for GRB020706
  23. Correction to IPN error box for GRB020706
  24. IPN triangulation of GRB020706
  25. GRB 020705: Optical observations
  26. GRB 020625, optical observations
  27. GRB 020625: Optical observations
  28. GRB 020531: optical photometry of Chandra sources
  29. GRB020625 (=H2081): A Long Burst Localized by HETE
  30. HETE #2081: Optical observations
  31. The Probable Host Galaxy of GRB/XRF 020427
  32. GRB/XRF 020427, detection of an underlying system with the VLT
  33. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  34. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  35. AXP 1E2259+586: quasi-simultaneous optical observation
  36. AXP 1E2259+586 optical observations
  37. Fading Optical Source in the Field of GRB020531
  38. GRB 020531, INT+WFC deep optical upper limits
  39. SGR-like Bursts from the AXP 1E 2259+586
  40. GRB020405: polarimetric observations
  41. GRB 020531, simultaneous optical observations
  42. GRB 020604, optical observations
  43. GRB 020531/Candidate Redshift
  44. GRB020531: Detection of Candidate Host Galaxy
  45. GRB020531: Second epoch Chandra observations
  46. GRB020604, optical observations
  47. GRB020604, BVRcIc field photometry
  48. GRB020603, BVRcIc field observations
  49. GRB020531, BVRcIc field photometry
  50. GRB020531 Optical observations with TAROT
  51. GRB020531 Optical observations with TAROT
  52. GRB 020418, optical/near-IR observations
  53. GRB 020531, Radio Observations
  54. IPN triangulation of GRB020604
  55. GRB020531 Optical Observations
  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. GRB020531: Upper Limit for Detection of Two TAROT Sources
  61. GRB 020603: Optical observations
  62. IPN triangulation of GRB020603 (possible short/hard GRB)
  63. GRB 020531 optical observations with TAROT
  64. Refined IPN error box for GRB020531
  65. GRB020531, optical observations
  66. GRB020531: optical observations
  67. GRB020531, optical observation
  68. GRB020531(=H2042): Optical Observations
  69. IPN triangulation of the short, hard GRB020531 (=H2042)
  70. GRB020531(=H2042): Optical Observations
  71. GRB020531: Optical observations
  72. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  73. GRB 020525: Optical Observations
  74. GRB020525, optical observations
  75. IPN detection of possible bursts from SGR1806-20
  76. IPN triangulation of GRB020525
  77. XRF 020427: Sudden Ionospheric Disturbance (SID)
  78. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  79. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  80. IPN triangulation of a burst from SGR1806-20
  81. GRB/XRF 020427, Radio Observations
  82. HST detection of the likely host galaxy of GRB 020124
  83. GRB020405 field photometry at ESO
  84. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  85. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  86. GRB020321 : Optical observations.
  87. GRB020427 BeppoSAX NFI Observation
  88. XRF 020427
  89. GRB020331: Third Epoch and Revised Second Epoch Optical
  90. The end of BSAX GRB activities
  91. GRB 020410, Radio Observations
  92. GRB 020418: Optical observations
  93. GRB 020124: Optical observations
  94. GRB 020418: Optical observations
  95. IPN triangulation of GRB020418
  96. GRB020405: VLT observations of the OT environment
  97. GRB020410: BeppoSAX NFI observations refined analysis
  98. GRB 020409: Optical Observations
  99. Mars Odyssey joins the IPN
  100. IPN triangulation of GRB020413

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