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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"

26385 results found.

  1. GRB020813, UBVRI field calibration
  2. GRB020812: NIR observations
  3. Polarimetry of GRB020813: evidence for variability
  4. GRB020813 IRAM millimeter observations
  5. GRB020812: optical observations
  6. GRB020813: High-Resolution Optical Observations
  7. GRB 020812: optical observation at Bisei
  8. GRB020813: Early Time Magnitude
  9. Millimeter observation of GRB 020813
  10. GRB020812: optical observations
  11. GRB 020813 : KISO multiband optical observations
  12. GRB020813, optical observations
  13. IPN error box for GRB020813
  14. GRB020813, astrometric position
  15. Spectropolarimetry of GRB 020813
  16. GRB 020812 optical observation
  17. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  18. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  19. HST Imaging of the Host of GRB 011121
  20. GRB020801, optical afterglow candidate
  21. GRB020331: Late-time Optical Light Curve (re-submission)
  22. GRB020331: Late-time Optical Light Curve
  23. IPN triangulation of GRB020714
  24. IPN triangulation of GRB020715 (=GRB150702)
  25. IPN triangulation of GRB020714
  26. IPN triangulation of GRB150702
  27. GRB 020410: Discovery of Probable OT by HST
  28. GRB 020124, HST observations of the fading afterglow
  29. IPN triangulation of GRB020708
  30. IPN triangulation of GRB020708
  31. Correction to IPN error box for GRB020706
  32. IPN triangulation of GRB020706
  33. GRB 020705: Optical observations
  34. GRB 020625, optical observations
  35. GRB 020625: Optical observations
  36. GRB 020531: optical photometry of Chandra sources
  37. GRB020625 (=H2081): A Long Burst Localized by HETE
  38. The Probable Host Galaxy of GRB/XRF 020427
  39. GRB/XRF 020427, detection of an underlying system with the VLT
  40. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  41. AXP 1E2259+586 optical observations
  42. Fading Optical Source in the Field of GRB020531
  43. GRB 020531, INT+WFC deep optical upper limits
  44. SGR-like Bursts from the AXP 1E 2259+586
  45. GRB020405: polarimetric observations
  46. GRB 020531, simultaneous optical observations
  47. GRB 020531/Candidate Redshift
  48. GRB020531: Detection of Candidate Host Galaxy
  49. GRB020531: Second epoch Chandra observations
  50. GRB020604, optical observations
  51. GRB020604, BVRcIc field photometry
  52. GRB020603, BVRcIc field observations
  53. GRB020531, BVRcIc field photometry
  54. GRB020531 Optical Observations
  55. GRB020531: Observations with the Chandra X-ray Observatory
  56. GRB020531, optical observations
  57. GRB020531: optical observations
  58. GRB020531(=H2042): Optical Observations
  59. GRB020531(=H2042): Optical Observations
  60. GRB020531: Optical observations
  61. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  62. GRB020525, optical observations
  63. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  64. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  65. HST detection of the likely host galaxy of GRB 020124
  66. GRB020405 field photometry at ESO
  67. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  68. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  69. GRB020321 : Optical observations.
  70. XRF 020427
  71. GRB 020124: Optical observations
  72. IPN triangulation of GRB020418
  73. GRB020405: VLT observations of the OT environment
  74. IPN triangulation of GRB020413
  75. GRB020405: predicted break
  76. GRB 020409: No Evidence for an Optical Afterglow
  77. GRB 020331 Kyoto observation on March 31
  78. GRB020410: BeppoSAX NFI observation
  79. X-ray afterglow of GRB020321
  80. GRB020331 optical observations with RIMOTS
  81. GRB020124 optical observations with RIBOTS/RIMOTS
  82. GRB 020321: Candidate X-ray Counterparts
  83. GRB020406(?), optical observations
  84. GRB 020405: Decay index
  85. Short RXTE/ASM transient 020406; may be a GRB
  86. GRB020405, Radio Observations
  87. GRB 020405, U-band observations
  88. GRB011212: Optical Observations
  89. GRB 020331: NIR Observations
  90. GRB020331 NIR observation at KPNO (re-submission)
  91. GRB02033 NIR observation at KPNO
  92. GRB020331 field photometry
  93. GRB 020331, NIR observations
  94. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  95. GRB 020322: BeppoSAX observations of the X-ray afterglow
  96. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  97. Near-Infrared Observations of GRB020322 at TIRGO
  98. GRB 020321, Radio Observations
  99. GRB 020322: Optical Observations
  100. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow

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