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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"

35948 results found.

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

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