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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"

35321 results found.

  1. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  2. GRB 020603: Optical observations
  3. IPN triangulation of GRB020603 (possible short/hard GRB)
  4. GRB 020531 optical observations with TAROT
  5. Refined IPN error box for GRB020531
  6. GRB020531, optical observations
  7. GRB020531(=H2042): Optical Observations
  8. IPN triangulation of the short, hard GRB020531 (=H2042)
  9. GRB020531(=H2042): Optical Observations
  10. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  11. GRB 020525: Optical Observations
  12. GRB020525, optical observations
  13. IPN detection of possible bursts from SGR1806-20
  14. IPN triangulation of GRB020525
  15. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  16. IPN triangulation of a burst from SGR1806-20
  17. GRB/XRF 020427, Radio Observations
  18. HST detection of the likely host galaxy of GRB 020124
  19. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  20. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  21. GRB020321 : Optical observations.
  22. GRB020427 BeppoSAX NFI Observation
  23. XRF 020427
  24. GRB020331: Third Epoch and Revised Second Epoch Optical
  25. The end of BSAX GRB activities
  26. GRB 020410, Radio Observations
  27. GRB 020418: Optical observations
  28. GRB 020124: Optical observations
  29. GRB 020418: Optical observations
  30. IPN triangulation of GRB020418
  31. GRB020405: VLT observations of the OT environment
  32. GRB020410: BeppoSAX NFI observations refined analysis
  33. GRB 020409: Optical Observations
  34. Mars Odyssey joins the IPN
  35. IPN triangulation of GRB020413
  36. GRB 020409, 2-nd epoch optical observations at Terskol.
  37. GRB 020409: Optical observations
  38. GRB 020409, No Optical Detection to R = 22
  39. GRB 020409: No Evidence for an Optical Afterglow
  40. GRB 020409, 2nd epoch optical observations
  41. GRB 020331 Kyoto observation on March 31
  42. GRB 020409
  43. GRB 020409 SARA Observations
  44. GRB "020411"
  45. GRB 020409, No Optical Detection to R = 20
  46. GRB020410: BeppoSAX NFI observation
  47. GRB 020409: Optical observations
  48. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  49. GRB 020410, optical observations
  50. BeppoSAX ALERT: possible GRB020411
  51. GRB 020409, optical observations
  52. GRB 020409: Optical Observations
  53. GRB020406(?), optical observations
  54. GRB020410, optical observations
  55. BeppoSAX ALERT: possible GRB020410
  56. X-ray afterglow of GRB020321
  57. BeppoSAX GRB : GRB020409
  58. GRB020405: VLT optical observations and V band decay slope
  59. GRB020331 optical observations with RIMOTS
  60. GRB020124 optical observations with RIBOTS/RIMOTS
  61. GRB 020321: Candidate X-ray Counterparts
  62. ASM GRB candidate 020406 refined error box
  63. GRB 020405: Moderate-resolution spectroscopy
  64. GRB020406(?), optical observations
  65. GRB020405: VLT optical observations
  66. Revised Photometry of the Optical Afterglow of GRB 020405
  67. GRB020405: OT observations
  68. GRB 020331: Candidate Optical Afterglow
  69. GRB 020405: Decay index
  70. Short RXTE/ASM transient 020406; may be a GRB
  71. GRB020405, Radio Observations
  72. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  73. GRB 020405, U-band observations
  74. GRB 020405: Optical afterglow candidate
  75. IPN localization of GRB020405
  76. GRB011212: Optical Observations
  77. GRB 020331: NIR Observations
  78. GRB 020331: NIR Observations
  79. GRB020331 NIR observation at KPNO (re-submission)
  80. GRB02033 NIR observation at KPNO
  81. GRB020331 field photometry
  82. GRB 020331 Optical Observations
  83. GRB 020331, NIR observations
  84. GRB 020331: Optical observations
  85. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  86. GRB 020321: Infrared observations
  87. GRB 020322: BeppoSAX observations of the X-ray afterglow
  88. SN 2002ap - peak brightness date (SN/GRB?)
  89. GRB 020322, Radio observations
  90. Near-Infrared Observations of GRB020322 at TIRGO
  91. GRB 020321, Radio Observations
  92. GRB 020322: Optical Observations
  93. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  94. GRB 020321: Optical observations
  95. GRB020317 BVRI field photometry
  96. GRB011211 revised BVRI field photometry
  97. GRB020305 BVRI field photometry
  98. GRB020322 BVRI field photometry
  99. GRB 020322 optical observations
  100. GRB 020322 optical observation

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