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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').
  1. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  2. GRB020813: Candidate Optical Afterglow
  3. GRB 020812 optical observation
  4. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  5. GRB 020715, optical observations
  6. GRB 020714, optical observations
  7. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  8. GRB020801: Candidate OT present in DSS
  9. HST Imaging of the Host of GRB 011121
  10. GRB020801, optical afterglow candidate
  11. Further refinement to IPN error box for GRB020531
  12. GRB020331: Late-time Optical Light Curve (re-submission)
  13. GRB020331: Late-time Optical Light Curve
  14. GRB 020405: HST observations reveal red bump
  15. IPN triangulation of GRB020714
  16. IPN triangulation of GRB020715 (=GRB150702)
  17. IPN triangulation of GRB020714
  18. IPN triangulation of GRB150702
  19. GRB 020410: Discovery of Probable OT by HST
  20. GRB 020124, HST observations of the fading afterglow
  21. IPN triangulation of GRB020708
  22. IPN triangulation of GRB020708
  23. IPN error box for GRB020706
  24. Correction to IPN error box for GRB020706
  25. IPN triangulation of GRB020706
  26. GRB 020705: Optical observations
  27. GRB 020625, optical observations
  28. GRB 020625: Optical observations
  29. GRB 020531: optical photometry of Chandra sources
  30. GRB020625 (=H2081): A Long Burst Localized by HETE
  31. HETE #2081: Optical observations
  32. The Probable Host Galaxy of GRB/XRF 020427
  33. GRB/XRF 020427, detection of an underlying system with the VLT
  34. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  35. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  36. AXP 1E2259+586: quasi-simultaneous optical observation
  37. AXP 1E2259+586 optical observations
  38. Fading Optical Source in the Field of GRB020531
  39. GRB 020531, INT+WFC deep optical upper limits
  40. SGR-like Bursts from the AXP 1E 2259+586
  41. GRB020405: polarimetric observations
  42. GRB 020531, simultaneous optical observations
  43. GRB 020604, optical observations
  44. GRB 020531/Candidate Redshift
  45. GRB020531: Detection of Candidate Host Galaxy
  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 Optical Observations
  57. GRB020531: Observations with the Chandra X-ray Observatory
  58. GRB 020603: Optical Observations
  59. GRB 020603, R-band observation
  60. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  61. GRB020531: Upper Limit for Detection of Two TAROT Sources
  62. GRB 020603: Optical observations
  63. IPN triangulation of GRB020603 (possible short/hard GRB)
  64. GRB 020531 optical observations with TAROT
  65. Refined IPN error box for GRB020531
  66. GRB020531, optical observations
  67. GRB020531: optical observations
  68. GRB020531, optical observation
  69. GRB020531(=H2042): Optical Observations
  70. IPN triangulation of the short, hard GRB020531 (=H2042)
  71. GRB020531(=H2042): Optical Observations
  72. GRB020531: Optical observations
  73. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  74. GRB 020525: Optical Observations
  75. GRB020525, optical observations
  76. IPN detection of possible bursts from SGR1806-20
  77. IPN triangulation of GRB020525
  78. XRF 020427: Sudden Ionospheric Disturbance (SID)
  79. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  80. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  81. IPN triangulation of a burst from SGR1806-20
  82. GRB/XRF 020427, Radio Observations
  83. HST detection of the likely host galaxy of GRB 020124
  84. GRB020405 field photometry at ESO
  85. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  86. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  87. GRB020321 : Optical observations.
  88. GRB020427 BeppoSAX NFI Observation
  89. XRF 020427
  90. GRB020331: Third Epoch and Revised Second Epoch Optical
  91. The end of BSAX GRB activities
  92. GRB 020410, Radio Observations
  93. GRB 020418: Optical observations
  94. GRB 020124: Optical observations
  95. GRB 020418: Optical observations
  96. IPN triangulation of GRB020418
  97. GRB020405: VLT observations of the OT environment
  98. GRB020410: BeppoSAX NFI observations refined analysis
  99. GRB 020409: Optical Observations
  100. Mars Odyssey joins the IPN

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