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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').
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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"

24781 results found.

  1. GRB020812: optical observations
  2. GRB020813: High-Resolution Optical Observations
  3. GRB 020812: optical observation at Bisei
  4. GRB020813: Early Time Magnitude
  5. Millimeter observation of GRB 020813
  6. GRB020812: optical observations
  7. GRB 020813 : KISO multiband optical observations
  8. GRB020813, optical observations
  9. IPN error box for GRB020813
  10. GRB020813, astrometric position
  11. Spectropolarimetry of GRB 020813
  12. GRB 020812 optical observation
  13. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  14. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  15. HST Imaging of the Host of GRB 011121
  16. GRB020801, optical afterglow candidate
  17. GRB020331: Late-time Optical Light Curve (re-submission)
  18. GRB020331: Late-time Optical Light Curve
  19. IPN triangulation of GRB020714
  20. IPN triangulation of GRB020715 (=GRB150702)
  21. IPN triangulation of GRB020714
  22. IPN triangulation of GRB150702
  23. GRB 020410: Discovery of Probable OT by HST
  24. GRB 020124, HST observations of the fading afterglow
  25. IPN triangulation of GRB020708
  26. IPN triangulation of GRB020708
  27. Correction to IPN error box for GRB020706
  28. IPN triangulation of GRB020706
  29. GRB 020705: Optical observations
  30. GRB 020625, optical observations
  31. GRB 020625: Optical observations
  32. GRB 020531: optical photometry of Chandra sources
  33. GRB020625 (=H2081): A Long Burst Localized by HETE
  34. The Probable Host Galaxy of GRB/XRF 020427
  35. GRB/XRF 020427, detection of an underlying system with the VLT
  36. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  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 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
  51. GRB020531: Observations with the Chandra X-ray Observatory
  52. GRB020531, optical observations
  53. GRB020531: optical observations
  54. GRB020531(=H2042): Optical Observations
  55. GRB020531(=H2042): Optical Observations
  56. GRB020531: Optical observations
  57. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  58. GRB020525, optical observations
  59. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  60. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  61. HST detection of the likely host galaxy of GRB 020124
  62. GRB020405 field photometry at ESO
  63. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  64. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  65. GRB020321 : Optical observations.
  66. XRF 020427
  67. GRB 020124: Optical observations
  68. IPN triangulation of GRB020418
  69. GRB020405: VLT observations of the OT environment
  70. IPN triangulation of GRB020413
  71. GRB020405: predicted break
  72. GRB 020409: No Evidence for an Optical Afterglow
  73. GRB 020331 Kyoto observation on March 31
  74. GRB020410: BeppoSAX NFI observation
  75. X-ray afterglow of GRB020321
  76. GRB020331 optical observations with RIMOTS
  77. GRB020124 optical observations with RIBOTS/RIMOTS
  78. GRB 020321: Candidate X-ray Counterparts
  79. GRB020406(?), optical observations
  80. GRB 020405: Decay index
  81. Short RXTE/ASM transient 020406; may be a GRB
  82. GRB020405, Radio Observations
  83. GRB 020405, U-band observations
  84. GRB011212: Optical Observations
  85. GRB 020331: NIR Observations
  86. GRB020331 NIR observation at KPNO (re-submission)
  87. GRB02033 NIR observation at KPNO
  88. GRB020331 field photometry
  89. GRB 020331, NIR observations
  90. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  91. GRB 020322: BeppoSAX observations of the X-ray afterglow
  92. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  93. Near-Infrared Observations of GRB020322 at TIRGO
  94. GRB 020321, Radio Observations
  95. GRB 020322: Optical Observations
  96. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  97. GRB 020321: Optical observations
  98. GRB020317 BVRI field photometry
  99. GRB011211 revised BVRI field photometry
  100. GRB020305 BVRI field photometry

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