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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"

14811 results found.

  1. GRB 020813, radio detection
  2. GRB 020812 : optical afterglow candidate
  3. GRB020813, optical observations
  4. IPN error box for GRB020813
  5. IPN triangulation of GRB020813
  6. Early Time Limits for GRB020813
  7. GRB020813, astrometric position
  8. GRB 020813 Afterglow Observations; Possible break
  9. GRB 020813 multiband optical observations
  10. GRB020813: optical afterglow
  11. GRB020813: Fading of Candidate OT
  12. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  13. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  14. GRB020801: Candidate OT present in DSS
  15. Further refinement to IPN error box for GRB020531
  16. GRB 020124, HST observations of the fading afterglow
  17. GRB020625 (=H2081): A Long Burst Localized by HETE
  18. GRB/XRF 020427, detection of an underlying system with the VLT
  19. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  20. GRB020405: polarimetric observations
  21. GRB 020531/Candidate Redshift
  22. GRB020531: Second epoch Chandra observations
  23. GRB020604, BVRcIc field photometry
  24. GRB020531: Observations with the Chandra X-ray Observatory
  25. GRB 020603: Optical Observations
  26. GRB020531: Upper Limit for Detection of Two TAROT Sources
  27. GRB020531: optical observations
  28. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  29. GRB 020525: Optical Observations
  30. GRB020525, optical observations
  31. GRB/XRF 020427, Radio Observations
  32. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  33. GRB020321 : Optical observations.
  34. GRB020331: Third Epoch and Revised Second Epoch Optical
  35. GRB 020410, Radio Observations
  36. GRB 020124: Optical observations
  37. GRB020405: VLT observations of the OT environment
  38. GRB020410: BeppoSAX NFI observations refined analysis
  39. Mars Odyssey joins the IPN
  40. GRB020405: predicted break
  41. GRB020410: second BeppoSAX NFI observation
  42. GRB 020331 Kyoto observation on March 31
  43. X-ray afterglow of GRB020321
  44. GRB020331: Confirmation of Afterglow Candidate with Magellan
  45. GRB020405: VLT optical observations and V band decay slope
  46. GRB 020321: Candidate X-ray Counterparts
  47. ASM GRB candidate 020406 refined error box
  48. GRB 020405: Moderate-resolution spectroscopy
  49. GRB020331: Optical Observations of Afterglow Candidate
  50. GRB020405: VLT optical observations
  51. Revised Photometry of the Optical Afterglow of GRB 020405
  52. Short RXTE/ASM transient 020406; may be a GRB
  53. GRB020405, Radio Observations
  54. V band observations of GRB020405
  55. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  56. GRB 020322: BeppoSAX observations of the X-ray afterglow
  57. SN 2002ap - peak brightness date (SN/GRB?)
  58. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  59. GRB011211 revised BVRI field photometry
  60. GRB020305 BVRI field photometry
  61. GRB020322 BVRI field photometry
  62. GRB020317 : Near IR Observations from Mt Abu Observatory
  63. GRB 020322: Optical candidate
  64. XMM-Newton observation of GRB020322
  65. GRB020321: a faint BeppoSAX detection
  66. GRB020305: NIR observations
  67. GRB 020317 : KISO Optical Observations
  68. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  69. GRB 011121: Third HST Epoch
  70. GRB020305: Properties of the Candidate Optical Afterglow
  71. GRB011130 (XRF011130) Second Epoch Chandra Observations
  72. GRB020305: Subaru Optical Observations
  73. XRF/GRB 011030: Detection of the Probable Host Galaxy
  74. GRB020305, optical observations
  75. GRB020305 (=H1939): Localization of a GRB by HETE
  76. GRB 010921: HST Observations
  77. IPN detection and localization of Cygnus X-1 flares
  78. IPN Upper Limits to a GRB Associated With SN2002ap
  79. GRB020124 BVRI field photometry
  80. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  81. SN2002ap (SN/GRB?) Echelle spectra
  82. SN2002ap (SN/GRB?) optical spectrographic observations
  83. SN 2002ap (SN/GRB?)
  84. SN 2002ap in M74
  85. Type Ib/c SN2002ap (SN/GRB?)
  86. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  87. VLT observations of GRB 020124: The fading optical/near-infrared afterglow
  88. GRB 020124: Optical observations
  89. GRB 020124 Optical Observations
  90. IPN triangulation of GRB020124 (HETE 1896)
  91. GRB020124(=H1896): Localization of a Long GRB by HETE
  92. GRB optical counterpart candidate in GCN 1217 is M dwarf
  93. GRB011212, Optical Observations
  94. GRB011211: BeppoSAX/GRBM data
  95. Optical polarization observations for GRB011211
  96. GRB 011130 and GRB 011212 - Milagro GeV/TeV Observations
  97. GRB 011211: TNG Spectroscopic Observations
  98. GRB011211, BVRI field photometry
  99. GRB 011211: BVRi-band photometry
  100. GRB 011211 Optical Observations: Likely Afterglow

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