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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"

42205 results found.

  1. GRB 020714, optical observations
  2. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  3. HST Imaging of the Host of GRB 011121
  4. GRB020801, optical afterglow candidate
  5. Further refinement to IPN error box for GRB020531
  6. GRB020331: Late-time Optical Light Curve (re-submission)
  7. GRB020331: Late-time Optical Light Curve
  8. GRB 020405: HST observations reveal red bump
  9. GRB 020410: Discovery of Probable OT by HST
  10. GRB 020124, HST observations of the fading afterglow
  11. IPN triangulation of GRB020708
  12. Correction to IPN error box for GRB020706
  13. GRB 020705: Optical observations
  14. GRB 020625, optical observations
  15. GRB 020625: Optical observations
  16. GRB 020531: optical photometry of Chandra sources
  17. GRB020625 (=H2081): A Long Burst Localized by HETE
  18. HETE #2081: Optical observations
  19. The Probable Host Galaxy of GRB/XRF 020427
  20. GRB/XRF 020427, detection of an underlying system with the VLT
  21. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  22. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  23. AXP 1E2259+586: quasi-simultaneous optical observation
  24. AXP 1E2259+586 optical observations
  25. Fading Optical Source in the Field of GRB020531
  26. GRB 020531, INT+WFC deep optical upper limits
  27. GRB020405: polarimetric observations
  28. GRB 020531, simultaneous optical observations
  29. GRB 020604, optical observations
  30. GRB 020531/Candidate Redshift
  31. GRB020531: Detection of Candidate Host Galaxy
  32. GRB020531: Second epoch Chandra observations
  33. GRB020604, optical observations
  34. GRB020604, BVRcIc field photometry
  35. GRB020603, BVRcIc field observations
  36. GRB020531, BVRcIc field photometry
  37. GRB020531 Optical observations with TAROT
  38. GRB020531 Optical observations with TAROT
  39. GRB 020418, optical/near-IR observations
  40. GRB 020531, Radio Observations
  41. GRB020531 Optical Observations
  42. GRB020531: Observations with the Chandra X-ray Observatory
  43. GRB 020603: Optical Observations
  44. GRB 020603, R-band observation
  45. GRB020531: Upper Limit for Detection of Two TAROT Sources
  46. GRB 020603: Optical observations
  47. GRB 020531 optical observations with TAROT
  48. Refined IPN error box for GRB020531
  49. GRB020531, optical observations
  50. GRB020531: optical observations
  51. GRB020531, optical observation
  52. GRB020531(=H2042): Optical Observations
  53. IPN triangulation of the short, hard GRB020531 (=H2042)
  54. GRB020531(=H2042): Optical Observations
  55. GRB020531: Optical observations
  56. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  57. GRB 020525: Optical Observations
  58. GRB020525, optical observations
  59. IPN detection of possible bursts from SGR1806-20
  60. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  61. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  62. IPN triangulation of a burst from SGR1806-20
  63. GRB/XRF 020427, Radio Observations
  64. HST detection of the likely host galaxy of GRB 020124
  65. GRB020405 field photometry at ESO
  66. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  67. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  68. GRB020321 : Optical observations.
  69. XRF 020427
  70. GRB020331: Third Epoch and Revised Second Epoch Optical
  71. The end of BSAX GRB activities
  72. GRB 020410, Radio Observations
  73. GRB 020418: Optical observations
  74. GRB 020124: Optical observations
  75. GRB 020418: Optical observations
  76. IPN triangulation of GRB020418
  77. GRB020405: VLT observations of the OT environment
  78. GRB020410: BeppoSAX NFI observations refined analysis
  79. GRB 020409: Optical Observations
  80. Mars Odyssey joins the IPN
  81. IPN triangulation of GRB020413
  82. GRB 020409, 2-nd epoch optical observations at Terskol.
  83. GRB020405: predicted break
  84. GRB 020409: Optical observations
  85. GRB 020409, No Optical Detection to R = 22
  86. GRB020410: second BeppoSAX NFI observation
  87. GRB 020409: No Evidence for an Optical Afterglow
  88. GRB 020409, 2nd epoch optical observations
  89. GRB 020331 Kyoto observation on March 31
  90. GRB 020409
  91. GRB 020409 SARA Observations
  92. GRB "020411"
  93. GRB 020409, No Optical Detection to R = 20
  94. GRB 020409: Optical observations
  95. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  96. GRB 020410, optical observations
  97. GRB 020409, optical observations
  98. GRB 020409: Optical Observations
  99. GRB020406(?), optical observations
  100. GRB020410, optical observations

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