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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"

27391 results found.

  1. GRB 020812: early time optical observation at Ouda Station
  2. GRB020813: Magellan BVRI Photometry
  3. GRB 020819: Optical observations
  4. K band observation of GRB 020819
  5. GRB020813: optical and NIR observations
  6. GRB020813: Fading X-ray Afterglow Observed with Chandra
  7. GRB020813, UBVRI field calibration
  8. GRB020812: NIR observations
  9. Polarimetry of GRB020813: evidence for variability
  10. GRB020813 IRAM millimeter observations
  11. GRB020812: optical observations
  12. GRB020813: High-Resolution Optical Observations
  13. GRB 020812: optical observation at Bisei
  14. GRB020813: Early Time Magnitude
  15. Millimeter observation of GRB 020813
  16. GRB020812: optical observations
  17. GRB 020813 : KISO multiband optical observations
  18. GRB020813, optical observations
  19. IPN error box for GRB020813
  20. GRB020813, astrometric position
  21. Spectropolarimetry of GRB 020813
  22. GRB 020812 optical observation
  23. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  24. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  25. HST Imaging of the Host of GRB 011121
  26. GRB020801, optical afterglow candidate
  27. GRB020331: Late-time Optical Light Curve (re-submission)
  28. GRB020331: Late-time Optical Light Curve
  29. IPN triangulation of GRB020714
  30. IPN triangulation of GRB020715 (=GRB150702)
  31. IPN triangulation of GRB020714
  32. IPN triangulation of GRB150702
  33. GRB 020410: Discovery of Probable OT by HST
  34. GRB 020124, HST observations of the fading afterglow
  35. IPN triangulation of GRB020708
  36. IPN triangulation of GRB020708
  37. Correction to IPN error box for GRB020706
  38. IPN triangulation of GRB020706
  39. GRB 020705: Optical observations
  40. GRB 020625, optical observations
  41. GRB 020625: Optical observations
  42. GRB 020531: optical photometry of Chandra sources
  43. GRB020625 (=H2081): A Long Burst Localized by HETE
  44. The Probable Host Galaxy of GRB/XRF 020427
  45. GRB/XRF 020427, detection of an underlying system with the VLT
  46. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  47. AXP 1E2259+586 optical observations
  48. Fading Optical Source in the Field of GRB020531
  49. GRB 020531, INT+WFC deep optical upper limits
  50. SGR-like Bursts from the AXP 1E 2259+586
  51. GRB020405: polarimetric observations
  52. GRB 020531, simultaneous optical observations
  53. GRB 020531/Candidate Redshift
  54. GRB020531: Detection of Candidate Host Galaxy
  55. GRB020531: Second epoch Chandra observations
  56. GRB020604, optical observations
  57. GRB020604, BVRcIc field photometry
  58. GRB020603, BVRcIc field observations
  59. GRB020531, BVRcIc field photometry
  60. GRB020531 Optical Observations
  61. GRB020531: Observations with the Chandra X-ray Observatory
  62. GRB020531, optical observations
  63. GRB020531: optical observations
  64. GRB020531(=H2042): Optical Observations
  65. GRB020531(=H2042): Optical Observations
  66. GRB020531: Optical observations
  67. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  68. GRB020525, optical observations
  69. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  70. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  71. HST detection of the likely host galaxy of GRB 020124
  72. GRB020405 field photometry at ESO
  73. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  74. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  75. GRB020321 : Optical observations.
  76. XRF 020427
  77. GRB 020124: Optical observations
  78. IPN triangulation of GRB020418
  79. GRB020405: VLT observations of the OT environment
  80. IPN triangulation of GRB020413
  81. GRB020405: predicted break
  82. GRB 020409: No Evidence for an Optical Afterglow
  83. GRB 020331 Kyoto observation on March 31
  84. GRB020410: BeppoSAX NFI observation
  85. X-ray afterglow of GRB020321
  86. GRB020331 optical observations with RIMOTS
  87. GRB020124 optical observations with RIBOTS/RIMOTS
  88. GRB 020321: Candidate X-ray Counterparts
  89. GRB020406(?), optical observations
  90. GRB 020405: Decay index
  91. Short RXTE/ASM transient 020406; may be a GRB
  92. GRB020405, Radio Observations
  93. GRB 020405, U-band observations
  94. GRB011212: Optical Observations
  95. GRB 020331: NIR Observations
  96. GRB020331 NIR observation at KPNO (re-submission)
  97. GRB02033 NIR observation at KPNO
  98. GRB020331 field photometry
  99. GRB 020331, NIR observations
  100. GRB020331(=H1963): The "Easter" Burst Detected by HETE

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