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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"

26370 results found.

  1. GRB 020812 optical observation
  2. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  3. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  4. HST Imaging of the Host of GRB 011121
  5. GRB020801, optical afterglow candidate
  6. GRB020331: Late-time Optical Light Curve (re-submission)
  7. GRB020331: Late-time Optical Light Curve
  8. IPN triangulation of GRB020714
  9. IPN triangulation of GRB020715 (=GRB150702)
  10. IPN triangulation of GRB020714
  11. IPN triangulation of GRB150702
  12. GRB 020410: Discovery of Probable OT by HST
  13. GRB 020124, HST observations of the fading afterglow
  14. IPN triangulation of GRB020708
  15. IPN triangulation of GRB020708
  16. Correction to IPN error box for GRB020706
  17. IPN triangulation of GRB020706
  18. GRB 020705: Optical observations
  19. GRB 020625, optical observations
  20. GRB 020625: Optical observations
  21. GRB 020531: optical photometry of Chandra sources
  22. GRB020625 (=H2081): A Long Burst Localized by HETE
  23. The Probable Host Galaxy of GRB/XRF 020427
  24. GRB/XRF 020427, detection of an underlying system with the VLT
  25. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  26. AXP 1E2259+586 optical observations
  27. Fading Optical Source in the Field of GRB020531
  28. GRB 020531, INT+WFC deep optical upper limits
  29. SGR-like Bursts from the AXP 1E 2259+586
  30. GRB020405: polarimetric observations
  31. GRB 020531, simultaneous optical observations
  32. GRB 020531/Candidate Redshift
  33. GRB020531: Detection of Candidate Host Galaxy
  34. GRB020531: Second epoch Chandra observations
  35. GRB020604, optical observations
  36. GRB020604, BVRcIc field photometry
  37. GRB020603, BVRcIc field observations
  38. GRB020531, BVRcIc field photometry
  39. GRB020531 Optical Observations
  40. GRB020531: Observations with the Chandra X-ray Observatory
  41. GRB020531, optical observations
  42. GRB020531: optical observations
  43. GRB020531(=H2042): Optical Observations
  44. GRB020531(=H2042): Optical Observations
  45. GRB020531: Optical observations
  46. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  47. GRB020525, optical observations
  48. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  49. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  50. HST detection of the likely host galaxy of GRB 020124
  51. GRB020405 field photometry at ESO
  52. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  53. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  54. GRB020321 : Optical observations.
  55. XRF 020427
  56. GRB 020124: Optical observations
  57. IPN triangulation of GRB020418
  58. GRB020405: VLT observations of the OT environment
  59. IPN triangulation of GRB020413
  60. GRB020405: predicted break
  61. GRB 020409: No Evidence for an Optical Afterglow
  62. GRB 020331 Kyoto observation on March 31
  63. GRB020410: BeppoSAX NFI observation
  64. X-ray afterglow of GRB020321
  65. GRB020331 optical observations with RIMOTS
  66. GRB020124 optical observations with RIBOTS/RIMOTS
  67. GRB 020321: Candidate X-ray Counterparts
  68. GRB020406(?), optical observations
  69. GRB 020405: Decay index
  70. Short RXTE/ASM transient 020406; may be a GRB
  71. GRB020405, Radio Observations
  72. GRB 020405, U-band observations
  73. GRB011212: Optical Observations
  74. GRB 020331: NIR Observations
  75. GRB020331 NIR observation at KPNO (re-submission)
  76. GRB02033 NIR observation at KPNO
  77. GRB020331 field photometry
  78. GRB 020331, NIR observations
  79. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  80. GRB 020322: BeppoSAX observations of the X-ray afterglow
  81. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  82. Near-Infrared Observations of GRB020322 at TIRGO
  83. GRB 020321, Radio Observations
  84. GRB 020322: Optical Observations
  85. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  86. GRB 020321: Optical observations
  87. GRB020317 BVRI field photometry
  88. GRB011211 revised BVRI field photometry
  89. GRB020305 BVRI field photometry
  90. GRB020322 BVRI field photometry
  91. GRB 020322: Optical Sources and Improved Astrometry
  92. GRB020317: optical observations
  93. GRB020321 optical observations
  94. GRB020321: a faint BeppoSAX detection
  95. GRB 020317 : KISO Optical Observations
  96. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  97. GRB 020305: Optical Observations
  98. GRB020317, optical observations
  99. GRB 020317: Optical observations
  100. GRB 011121: Third HST Epoch

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