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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"

36036 results found.

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

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