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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"

25280 results found.

  1. GRB020813: High-Resolution Optical Observations
  2. GRB 020812: optical observation at Bisei
  3. GRB020813: Early Time Magnitude
  4. Millimeter observation of GRB 020813
  5. GRB020812: optical observations
  6. GRB 020813 : KISO multiband optical observations
  7. GRB020813, optical observations
  8. IPN error box for GRB020813
  9. GRB020813, astrometric position
  10. Spectropolarimetry of GRB 020813
  11. GRB 020812 optical observation
  12. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  13. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  14. HST Imaging of the Host of GRB 011121
  15. GRB020801, optical afterglow candidate
  16. GRB020331: Late-time Optical Light Curve (re-submission)
  17. GRB020331: Late-time Optical Light Curve
  18. IPN triangulation of GRB020714
  19. IPN triangulation of GRB020715 (=GRB150702)
  20. IPN triangulation of GRB020714
  21. IPN triangulation of GRB150702
  22. GRB 020410: Discovery of Probable OT by HST
  23. GRB 020124, HST observations of the fading afterglow
  24. IPN triangulation of GRB020708
  25. IPN triangulation of GRB020708
  26. Correction to IPN error box for GRB020706
  27. IPN triangulation of GRB020706
  28. GRB 020705: Optical observations
  29. GRB 020625, optical observations
  30. GRB 020625: Optical observations
  31. GRB 020531: optical photometry of Chandra sources
  32. GRB020625 (=H2081): A Long Burst Localized by HETE
  33. The Probable Host Galaxy of GRB/XRF 020427
  34. GRB/XRF 020427, detection of an underlying system with the VLT
  35. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  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 020531/Candidate Redshift
  43. GRB020531: Detection of Candidate Host Galaxy
  44. GRB020531: Second epoch Chandra observations
  45. GRB020604, optical observations
  46. GRB020604, BVRcIc field photometry
  47. GRB020603, BVRcIc field observations
  48. GRB020531, BVRcIc field photometry
  49. GRB020531 Optical Observations
  50. GRB020531: Observations with the Chandra X-ray Observatory
  51. GRB020531, optical observations
  52. GRB020531: optical observations
  53. GRB020531(=H2042): Optical Observations
  54. GRB020531(=H2042): Optical Observations
  55. GRB020531: Optical observations
  56. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  57. GRB020525, optical observations
  58. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  59. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  60. HST detection of the likely host galaxy of GRB 020124
  61. GRB020405 field photometry at ESO
  62. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  63. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  64. GRB020321 : Optical observations.
  65. XRF 020427
  66. GRB 020124: Optical observations
  67. IPN triangulation of GRB020418
  68. GRB020405: VLT observations of the OT environment
  69. IPN triangulation of GRB020413
  70. GRB020405: predicted break
  71. GRB 020409: No Evidence for an Optical Afterglow
  72. GRB 020331 Kyoto observation on March 31
  73. GRB020410: BeppoSAX NFI observation
  74. X-ray afterglow of GRB020321
  75. GRB020331 optical observations with RIMOTS
  76. GRB020124 optical observations with RIBOTS/RIMOTS
  77. GRB 020321: Candidate X-ray Counterparts
  78. GRB020406(?), optical observations
  79. GRB 020405: Decay index
  80. Short RXTE/ASM transient 020406; may be a GRB
  81. GRB020405, Radio Observations
  82. GRB 020405, U-band observations
  83. GRB011212: Optical Observations
  84. GRB 020331: NIR Observations
  85. GRB020331 NIR observation at KPNO (re-submission)
  86. GRB02033 NIR observation at KPNO
  87. GRB020331 field photometry
  88. GRB 020331, NIR observations
  89. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  90. GRB 020322: BeppoSAX observations of the X-ray afterglow
  91. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  92. Near-Infrared Observations of GRB020322 at TIRGO
  93. GRB 020321, Radio Observations
  94. GRB 020322: Optical Observations
  95. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  96. GRB 020321: Optical observations
  97. GRB020317 BVRI field photometry
  98. GRB011211 revised BVRI field photometry
  99. GRB020305 BVRI field photometry
  100. GRB020322 BVRI field photometry

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