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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"

27393 results found.

  1. Second epoch K band imaging of GRB 020819
  2. GRB 020813 : HST observations
  3. GRB 020812: early time optical observation at Ouda Station
  4. GRB020813: Magellan BVRI Photometry
  5. GRB 020819: Optical observations
  6. K band observation of GRB 020819
  7. GRB020813: optical and NIR observations
  8. GRB020813: Fading X-ray Afterglow Observed with Chandra
  9. GRB020813, UBVRI field calibration
  10. GRB020812: NIR observations
  11. Polarimetry of GRB020813: evidence for variability
  12. GRB020813 IRAM millimeter observations
  13. GRB020812: optical observations
  14. GRB020813: High-Resolution Optical Observations
  15. GRB 020812: optical observation at Bisei
  16. GRB020813: Early Time Magnitude
  17. Millimeter observation of GRB 020813
  18. GRB020812: optical observations
  19. GRB 020813 : KISO multiband optical observations
  20. GRB020813, optical observations
  21. IPN error box for GRB020813
  22. GRB020813, astrometric position
  23. Spectropolarimetry of GRB 020813
  24. GRB 020812 optical observation
  25. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  26. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  27. HST Imaging of the Host of GRB 011121
  28. GRB020801, optical afterglow candidate
  29. GRB020331: Late-time Optical Light Curve (re-submission)
  30. GRB020331: Late-time Optical Light Curve
  31. IPN triangulation of GRB020714
  32. IPN triangulation of GRB020715 (=GRB150702)
  33. IPN triangulation of GRB020714
  34. IPN triangulation of GRB150702
  35. GRB 020410: Discovery of Probable OT by HST
  36. GRB 020124, HST observations of the fading afterglow
  37. IPN triangulation of GRB020708
  38. IPN triangulation of GRB020708
  39. Correction to IPN error box for GRB020706
  40. IPN triangulation of GRB020706
  41. GRB 020705: Optical observations
  42. GRB 020625, optical observations
  43. GRB 020625: Optical observations
  44. GRB 020531: optical photometry of Chandra sources
  45. GRB020625 (=H2081): A Long Burst Localized by HETE
  46. The Probable Host Galaxy of GRB/XRF 020427
  47. GRB/XRF 020427, detection of an underlying system with the VLT
  48. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  49. AXP 1E2259+586 optical observations
  50. Fading Optical Source in the Field of GRB020531
  51. GRB 020531, INT+WFC deep optical upper limits
  52. SGR-like Bursts from the AXP 1E 2259+586
  53. GRB020405: polarimetric observations
  54. GRB 020531, simultaneous optical observations
  55. GRB 020531/Candidate Redshift
  56. GRB020531: Detection of Candidate Host Galaxy
  57. GRB020531: Second epoch Chandra observations
  58. GRB020604, optical observations
  59. GRB020604, BVRcIc field photometry
  60. GRB020603, BVRcIc field observations
  61. GRB020531, BVRcIc field photometry
  62. GRB020531 Optical Observations
  63. GRB020531: Observations with the Chandra X-ray Observatory
  64. GRB020531, optical observations
  65. GRB020531: optical observations
  66. GRB020531(=H2042): Optical Observations
  67. GRB020531(=H2042): Optical Observations
  68. GRB020531: Optical observations
  69. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  70. GRB020525, optical observations
  71. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  72. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  73. HST detection of the likely host galaxy of GRB 020124
  74. GRB020405 field photometry at ESO
  75. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  76. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  77. GRB020321 : Optical observations.
  78. XRF 020427
  79. GRB 020124: Optical observations
  80. IPN triangulation of GRB020418
  81. GRB020405: VLT observations of the OT environment
  82. IPN triangulation of GRB020413
  83. GRB020405: predicted break
  84. GRB 020409: No Evidence for an Optical Afterglow
  85. GRB 020331 Kyoto observation on March 31
  86. GRB020410: BeppoSAX NFI observation
  87. X-ray afterglow of GRB020321
  88. GRB020331 optical observations with RIMOTS
  89. GRB020124 optical observations with RIBOTS/RIMOTS
  90. GRB 020321: Candidate X-ray Counterparts
  91. GRB020406(?), optical observations
  92. GRB 020405: Decay index
  93. Short RXTE/ASM transient 020406; may be a GRB
  94. GRB020405, Radio Observations
  95. GRB 020405, U-band observations
  96. GRB011212: Optical Observations
  97. GRB 020331: NIR Observations
  98. GRB020331 NIR observation at KPNO (re-submission)
  99. GRB02033 NIR observation at KPNO
  100. GRB020331 field photometry

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