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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').
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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"

45431 results found.

  1. IPN triangulation of GRB020708
  2. IPN triangulation of GRB020708
  3. IPN error box for GRB020706
  4. Correction to IPN error box for GRB020706
  5. IPN triangulation of GRB020706
  6. GRB 020705: Optical observations
  7. GRB 020625, optical observations
  8. GRB 020625: Optical observations
  9. GRB 020531: optical photometry of Chandra sources
  10. GRB020625 (=H2081): A Long Burst Localized by HETE
  11. HETE #2081: Optical observations
  12. The Probable Host Galaxy of GRB/XRF 020427
  13. GRB/XRF 020427, detection of an underlying system with the VLT
  14. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  15. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  16. AXP 1E2259+586: quasi-simultaneous optical observation
  17. AXP 1E2259+586 optical observations
  18. Fading Optical Source in the Field of GRB020531
  19. GRB 020531, INT+WFC deep optical upper limits
  20. SGR-like Bursts from the AXP 1E 2259+586
  21. GRB020405: polarimetric observations
  22. GRB 020531, simultaneous optical observations
  23. GRB 020604, optical observations
  24. GRB 020531/Candidate Redshift
  25. GRB020531: Detection of Candidate Host Galaxy
  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 Optical Observations
  37. GRB020531: Observations with the Chandra X-ray Observatory
  38. GRB 020603: Optical Observations
  39. GRB 020603, R-band observation
  40. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  41. GRB020531: Upper Limit for Detection of Two TAROT Sources
  42. GRB 020603: Optical observations
  43. IPN triangulation of GRB020603 (possible short/hard GRB)
  44. GRB 020531 optical observations with TAROT
  45. Refined IPN error box for GRB020531
  46. GRB020531, optical observations
  47. GRB020531: optical observations
  48. GRB020531, optical observation
  49. GRB020531(=H2042): Optical Observations
  50. IPN triangulation of the short, hard GRB020531 (=H2042)
  51. GRB020531(=H2042): Optical Observations
  52. GRB020531: Optical observations
  53. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  54. GRB 020525: Optical Observations
  55. GRB020525, optical observations
  56. IPN detection of possible bursts from SGR1806-20
  57. IPN triangulation of GRB020525
  58. XRF 020427: Sudden Ionospheric Disturbance (SID)
  59. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  60. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  61. IPN triangulation of a burst from SGR1806-20
  62. GRB/XRF 020427, Radio Observations
  63. HST detection of the likely host galaxy of GRB 020124
  64. GRB020405 field photometry at ESO
  65. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  66. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  67. GRB020321 : Optical observations.
  68. GRB020427 BeppoSAX NFI Observation
  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. GRB020410: BeppoSAX NFI observation
  95. GRB 020409: Optical observations
  96. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  97. GRB 020410, optical observations
  98. BeppoSAX ALERT: possible GRB020411
  99. GRB 020409, optical observations
  100. GRB 020409: Optical Observations

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