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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"

35427 results found.

  1. GRB 020418, optical/near-IR observations
  2. GRB 020531, Radio Observations
  3. IPN triangulation of GRB020604
  4. GRB020531: Observations with the Chandra X-ray Observatory
  5. GRB 020603: Optical Observations
  6. GRB 020603, R-band observation
  7. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  8. GRB 020603: Optical observations
  9. IPN triangulation of GRB020603 (possible short/hard GRB)
  10. GRB 020531 optical observations with TAROT
  11. Refined IPN error box for GRB020531
  12. GRB020531, optical observations
  13. GRB020531(=H2042): Optical Observations
  14. IPN triangulation of the short, hard GRB020531 (=H2042)
  15. GRB020531(=H2042): Optical Observations
  16. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  17. GRB 020525: Optical Observations
  18. GRB020525, optical observations
  19. IPN detection of possible bursts from SGR1806-20
  20. IPN triangulation of GRB020525
  21. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  22. IPN triangulation of a burst from SGR1806-20
  23. GRB/XRF 020427, Radio Observations
  24. HST detection of the likely host galaxy of GRB 020124
  25. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  26. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  27. GRB020321 : Optical observations.
  28. GRB020427 BeppoSAX NFI Observation
  29. XRF 020427
  30. GRB020331: Third Epoch and Revised Second Epoch Optical
  31. The end of BSAX GRB activities
  32. GRB 020410, Radio Observations
  33. GRB 020418: Optical observations
  34. GRB 020124: Optical observations
  35. GRB 020418: Optical observations
  36. IPN triangulation of GRB020418
  37. GRB020405: VLT observations of the OT environment
  38. GRB020410: BeppoSAX NFI observations refined analysis
  39. GRB 020409: Optical Observations
  40. Mars Odyssey joins the IPN
  41. IPN triangulation of GRB020413
  42. GRB 020409, 2-nd epoch optical observations at Terskol.
  43. GRB 020409: Optical observations
  44. GRB 020409, No Optical Detection to R = 22
  45. GRB 020409: No Evidence for an Optical Afterglow
  46. GRB 020409, 2nd epoch optical observations
  47. GRB 020331 Kyoto observation on March 31
  48. GRB 020409
  49. GRB 020409 SARA Observations
  50. GRB "020411"
  51. GRB 020409, No Optical Detection to R = 20
  52. GRB020410: BeppoSAX NFI observation
  53. GRB 020409: Optical observations
  54. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  55. GRB 020410, optical observations
  56. BeppoSAX ALERT: possible GRB020411
  57. GRB 020409, optical observations
  58. GRB 020409: Optical Observations
  59. GRB020406(?), optical observations
  60. GRB020410, optical observations
  61. BeppoSAX ALERT: possible GRB020410
  62. X-ray afterglow of GRB020321
  63. BeppoSAX GRB : GRB020409
  64. GRB020405: VLT optical observations and V band decay slope
  65. GRB020331 optical observations with RIMOTS
  66. GRB020124 optical observations with RIBOTS/RIMOTS
  67. GRB 020321: Candidate X-ray Counterparts
  68. ASM GRB candidate 020406 refined error box
  69. GRB 020405: Moderate-resolution spectroscopy
  70. GRB020406(?), optical observations
  71. GRB020405: VLT optical observations
  72. Revised Photometry of the Optical Afterglow of GRB 020405
  73. GRB020405: OT observations
  74. GRB 020331: Candidate Optical Afterglow
  75. GRB 020405: Decay index
  76. Short RXTE/ASM transient 020406; may be a GRB
  77. GRB020405, Radio Observations
  78. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  79. GRB 020405, U-band observations
  80. GRB 020405: Optical afterglow candidate
  81. IPN localization of GRB020405
  82. GRB011212: Optical Observations
  83. GRB 020331: NIR Observations
  84. GRB 020331: NIR Observations
  85. GRB020331 NIR observation at KPNO (re-submission)
  86. GRB02033 NIR observation at KPNO
  87. GRB020331 field photometry
  88. GRB 020331 Optical Observations
  89. GRB 020331, NIR observations
  90. GRB 020331: Optical observations
  91. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  92. GRB 020321: Infrared observations
  93. GRB 020322: BeppoSAX observations of the X-ray afterglow
  94. SN 2002ap - peak brightness date (SN/GRB?)
  95. GRB 020322, Radio observations
  96. Near-Infrared Observations of GRB020322 at TIRGO
  97. GRB 020321, Radio Observations
  98. GRB 020322: Optical Observations
  99. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  100. GRB 020321: Optical observations

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