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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

42605 results found.

  1. IPN error box for GRB020813
  2. IPN triangulation of GRB020813
  3. GRB020812: possible afterglow candidate
  4. Early Time Limits for GRB020813
  5. GRB020812: possible afterglow candidate
  6. GRB020813, astrometric position
  7. Spectropolarimetry of GRB 020813
  8. GRB 020813 Afterglow Observations; Possible break
  9. GRB 020813: Absorption redshift
  10. GRB 020813 multiband optical observations
  11. GRB020813: optical afterglow
  12. GRB020813: Fading of Candidate OT
  13. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  14. GRB020813: Candidate Optical Afterglow
  15. GRB 020812 optical observation
  16. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  17. GRB 020715, optical observations
  18. GRB 020714, optical observations
  19. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  20. GRB020801: Candidate OT present in DSS
  21. HST Imaging of the Host of GRB 011121
  22. GRB020801, optical afterglow candidate
  23. Further refinement to IPN error box for GRB020531
  24. GRB020331: Late-time Optical Light Curve (re-submission)
  25. GRB020331: Late-time Optical Light Curve
  26. GRB 020405: HST observations reveal red bump
  27. IPN triangulation of GRB020715 (=GRB150702)
  28. IPN triangulation of GRB020714
  29. IPN triangulation of GRB150702
  30. GRB 020410: Discovery of Probable OT by HST
  31. GRB 020124, HST observations of the fading afterglow
  32. IPN triangulation of GRB020708
  33. IPN triangulation of GRB020708
  34. IPN triangulation of GRB020706
  35. GRB 020705: Optical observations
  36. GRB 020625: Optical observations
  37. GRB 020531: optical photometry of Chandra sources
  38. GRB020625 (=H2081): A Long Burst Localized by HETE
  39. HETE #2081: Optical observations
  40. The Probable Host Galaxy of GRB/XRF 020427
  41. GRB/XRF 020427, detection of an underlying system with the VLT
  42. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  43. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  44. AXP 1E2259+586: quasi-simultaneous optical observation
  45. AXP 1E2259+586 optical observations
  46. Fading Optical Source in the Field of GRB020531
  47. GRB 020531, INT+WFC deep optical upper limits
  48. SGR-like Bursts from the AXP 1E 2259+586
  49. GRB020405: polarimetric observations
  50. GRB 020531, simultaneous optical observations
  51. GRB 020604, optical observations
  52. GRB 020531/Candidate Redshift
  53. GRB020531: Detection of Candidate Host Galaxy
  54. GRB020531: Second epoch Chandra observations
  55. GRB020604, optical observations
  56. GRB020604, BVRcIc field photometry
  57. GRB020603, BVRcIc field observations
  58. GRB020531, BVRcIc field photometry
  59. GRB020531 Optical observations with TAROT
  60. GRB020531 Optical observations with TAROT
  61. GRB 020418, optical/near-IR observations
  62. GRB 020531, Radio Observations
  63. IPN triangulation of GRB020604
  64. GRB020531 Optical Observations
  65. GRB020531: Observations with the Chandra X-ray Observatory
  66. GRB 020603, R-band observation
  67. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  68. GRB020531: Upper Limit for Detection of Two TAROT Sources
  69. GRB 020603: Optical observations
  70. IPN triangulation of GRB020603 (possible short/hard GRB)
  71. GRB 020531 optical observations with TAROT
  72. Refined IPN error box for GRB020531
  73. GRB020531, optical observations
  74. GRB020531: optical observations
  75. GRB020531, optical observation
  76. GRB020531(=H2042): Optical Observations
  77. IPN triangulation of the short, hard GRB020531 (=H2042)
  78. GRB020531(=H2042): Optical Observations
  79. GRB020531: Optical observations
  80. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  81. GRB 020525: Optical Observations
  82. GRB020525, optical observations
  83. IPN detection of possible bursts from SGR1806-20
  84. IPN triangulation of GRB020525
  85. XRF 020427: Sudden Ionospheric Disturbance (SID)
  86. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  87. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  88. IPN triangulation of a burst from SGR1806-20
  89. GRB/XRF 020427, Radio Observations
  90. HST detection of the likely host galaxy of GRB 020124
  91. GRB020405 field photometry at ESO
  92. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  93. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  94. GRB020321 : Optical observations.
  95. GRB020427 BeppoSAX NFI Observation
  96. XRF 020427
  97. GRB020331: Third Epoch and Revised Second Epoch Optical
  98. The end of BSAX GRB activities
  99. GRB 020410, Radio Observations
  100. GRB 020418: Optical observations

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