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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"

36159 results found.

  1. GRB020331: Late-time Optical Light Curve (re-submission)
  2. GRB020331: Late-time Optical Light Curve
  3. GRB 020405: HST observations reveal red bump
  4. IPN triangulation of GRB020714
  5. IPN triangulation of GRB020715 (=GRB150702)
  6. IPN triangulation of GRB020714
  7. IPN triangulation of GRB150702
  8. GRB 020410: Discovery of Probable OT by HST
  9. GRB 020124, HST observations of the fading afterglow
  10. IPN triangulation of GRB020708
  11. IPN triangulation of GRB020708
  12. IPN error box for GRB020706
  13. IPN triangulation of GRB020706
  14. GRB 020705: Optical observations
  15. GRB 020625, optical observations
  16. GRB 020625: Optical observations
  17. GRB 020531: optical photometry of Chandra sources
  18. GRB020625 (=H2081): A Long Burst Localized by HETE
  19. The Probable Host Galaxy of GRB/XRF 020427
  20. GRB/XRF 020427, detection of an underlying system with the VLT
  21. GRB 020531, INT+WFC deep optical upper limits
  22. GRB020405: polarimetric observations
  23. GRB 020531, simultaneous optical observations
  24. GRB 020604, optical observations
  25. GRB 020531/Candidate Redshift
  26. GRB020531: Second epoch Chandra observations
  27. GRB020604, optical observations
  28. GRB020604, BVRcIc field photometry
  29. GRB020603, BVRcIc field observations
  30. GRB020531, BVRcIc field photometry
  31. GRB020531 Optical observations with TAROT
  32. GRB020531 Optical observations with TAROT
  33. GRB 020418, optical/near-IR observations
  34. GRB 020531, Radio Observations
  35. IPN triangulation of GRB020604
  36. GRB020531: Observations with the Chandra X-ray Observatory
  37. GRB 020603: Optical Observations
  38. GRB 020603, R-band observation
  39. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  40. GRB 020603: Optical observations
  41. IPN triangulation of GRB020603 (possible short/hard GRB)
  42. GRB 020531 optical observations with TAROT
  43. Refined IPN error box for GRB020531
  44. GRB020531, optical observations
  45. GRB020531(=H2042): Optical Observations
  46. IPN triangulation of the short, hard GRB020531 (=H2042)
  47. GRB020531(=H2042): Optical Observations
  48. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  49. GRB 020525: Optical Observations
  50. GRB020525, optical observations
  51. IPN detection of possible bursts from SGR1806-20
  52. IPN triangulation of GRB020525
  53. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  54. IPN triangulation of a burst from SGR1806-20
  55. GRB/XRF 020427, Radio Observations
  56. HST detection of the likely host galaxy of GRB 020124
  57. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  58. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  59. GRB020321 : Optical observations.
  60. GRB020427 BeppoSAX NFI Observation
  61. XRF 020427
  62. GRB020331: Third Epoch and Revised Second Epoch Optical
  63. The end of BSAX GRB activities
  64. GRB 020410, Radio Observations
  65. GRB 020418: Optical observations
  66. GRB 020124: Optical observations
  67. GRB 020418: Optical observations
  68. IPN triangulation of GRB020418
  69. GRB020405: VLT observations of the OT environment
  70. GRB020410: BeppoSAX NFI observations refined analysis
  71. GRB 020409: Optical Observations
  72. Mars Odyssey joins the IPN
  73. IPN triangulation of GRB020413
  74. GRB 020409, 2-nd epoch optical observations at Terskol.
  75. GRB 020409: Optical observations
  76. GRB 020409, No Optical Detection to R = 22
  77. GRB 020409: No Evidence for an Optical Afterglow
  78. GRB 020409, 2nd epoch optical observations
  79. GRB 020331 Kyoto observation on March 31
  80. GRB 020409
  81. GRB 020409 SARA Observations
  82. GRB "020411"
  83. GRB 020409, No Optical Detection to R = 20
  84. GRB020410: BeppoSAX NFI observation
  85. GRB 020409: Optical observations
  86. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  87. GRB 020410, optical observations
  88. BeppoSAX ALERT: possible GRB020411
  89. GRB 020409, optical observations
  90. GRB 020409: Optical Observations
  91. GRB020406(?), optical observations
  92. GRB020410, optical observations
  93. BeppoSAX ALERT: possible GRB020410
  94. X-ray afterglow of GRB020321
  95. BeppoSAX GRB : GRB020409
  96. GRB020405: VLT optical observations and V band decay slope
  97. GRB020331 optical observations with RIMOTS
  98. GRB020124 optical observations with RIBOTS/RIMOTS
  99. GRB 020321: Candidate X-ray Counterparts
  100. ASM GRB candidate 020406 refined error box

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