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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"

28089 results found.

  1. GRB 020819: Optical observations
  2. K band observation of GRB 020819
  3. GRB020813: optical and NIR observations
  4. GRB020813: Fading X-ray Afterglow Observed with Chandra
  5. GRB020813, UBVRI field calibration
  6. GRB020812: NIR observations
  7. Polarimetry of GRB020813: evidence for variability
  8. GRB020813 IRAM millimeter observations
  9. GRB020812: optical observations
  10. GRB020813: High-Resolution Optical Observations
  11. GRB 020812: optical observation at Bisei
  12. GRB020813: Early Time Magnitude
  13. Millimeter observation of GRB 020813
  14. GRB020812: optical observations
  15. GRB 020813 : KISO multiband optical observations
  16. GRB020813, optical observations
  17. IPN error box for GRB020813
  18. GRB020813, astrometric position
  19. Spectropolarimetry of GRB 020813
  20. GRB 020812 optical observation
  21. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  22. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  23. HST Imaging of the Host of GRB 011121
  24. GRB020801, optical afterglow candidate
  25. GRB020331: Late-time Optical Light Curve (re-submission)
  26. GRB020331: Late-time Optical Light Curve
  27. IPN triangulation of GRB020714
  28. IPN triangulation of GRB020715 (=GRB150702)
  29. IPN triangulation of GRB020714
  30. IPN triangulation of GRB150702
  31. GRB 020410: Discovery of Probable OT by HST
  32. GRB 020124, HST observations of the fading afterglow
  33. IPN triangulation of GRB020708
  34. IPN triangulation of GRB020708
  35. Correction to IPN error box for GRB020706
  36. IPN triangulation of GRB020706
  37. GRB 020705: Optical observations
  38. GRB 020625, optical observations
  39. GRB 020625: Optical observations
  40. GRB 020531: optical photometry of Chandra sources
  41. GRB020625 (=H2081): A Long Burst Localized by HETE
  42. The Probable Host Galaxy of GRB/XRF 020427
  43. GRB/XRF 020427, detection of an underlying system with the VLT
  44. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  45. AXP 1E2259+586 optical observations
  46. Fading Optical Source in the Field of GRB020531
  47. GRB 020531, INT+WFC deep optical upper limits
  48. SGR-like Bursts from the AXP 1E 2259+586
  49. GRB020405: polarimetric observations
  50. GRB 020531, simultaneous optical observations
  51. GRB 020531/Candidate Redshift
  52. GRB020531: Detection of Candidate Host Galaxy
  53. GRB020531: Second epoch Chandra observations
  54. GRB020604, optical observations
  55. GRB020604, BVRcIc field photometry
  56. GRB020603, BVRcIc field observations
  57. GRB020531, BVRcIc field photometry
  58. GRB020531 Optical Observations
  59. GRB020531: Observations with the Chandra X-ray Observatory
  60. GRB020531, optical observations
  61. GRB020531: optical observations
  62. GRB020531(=H2042): Optical Observations
  63. GRB020531(=H2042): Optical Observations
  64. GRB020531: Optical observations
  65. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  66. GRB020525, optical observations
  67. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  68. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  69. HST detection of the likely host galaxy of GRB 020124
  70. GRB020405 field photometry at ESO
  71. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  72. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  73. GRB020321 : Optical observations.
  74. XRF 020427
  75. GRB 020124: Optical observations
  76. IPN triangulation of GRB020418
  77. GRB020405: VLT observations of the OT environment
  78. IPN triangulation of GRB020413
  79. GRB020405: predicted break
  80. GRB 020409: No Evidence for an Optical Afterglow
  81. GRB 020331 Kyoto observation on March 31
  82. GRB020410: BeppoSAX NFI observation
  83. X-ray afterglow of GRB020321
  84. GRB020331 optical observations with RIMOTS
  85. GRB020124 optical observations with RIBOTS/RIMOTS
  86. GRB 020321: Candidate X-ray Counterparts
  87. GRB020406(?), optical observations
  88. GRB 020405: Decay index
  89. Short RXTE/ASM transient 020406; may be a GRB
  90. GRB020405, Radio Observations
  91. GRB 020405, U-band observations
  92. GRB011212: Optical Observations
  93. GRB 020331: NIR Observations
  94. GRB020331 NIR observation at KPNO (re-submission)
  95. GRB02033 NIR observation at KPNO
  96. GRB020331 field photometry
  97. GRB 020331, NIR observations
  98. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  99. GRB 020322: BeppoSAX observations of the X-ray afterglow
  100. GRB011211: HST Observations of Optical Afterglow and Host Galaxy

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