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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"

27321 results found.

  1. SGR 1806-20, submm observations
  2. RXTE PCA Observations of SGR1806-20 Region
  3. IPN triangulation of GRB030714 (two large error boxes)
  4. IPN triangulation of GRB030715 (two large error boxes)
  5. GRB030706 triangulation (single large error box)
  6. GRB030329, optical observation in May
  7. IPN triangulation of GRB030626 (single large error box)
  8. IPN triangulation of GRB030626 (two large error boxes)
  9. GRB030329: second XMM-Newton observation
  10. GRB030329 -- RATAN-600 data in April-May
  11. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  12. IPN triangulation of GRB030606 (two alternate error boxes)
  13. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  14. GRB 030528: tentative NIR counterpart
  15. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  16. GRB030528, BVRI field photometry
  17. GRB030329, SPM optical observations
  18. GRB030528: Chandra TOO Planned
  19. GRB030528(=H2724): Revised SXC Localization
  20. GRB 030528 Bisei optical observation
  21. GRB030528 (H2724): A long GRB localized by HETE
  22. GRB 030329: Correction to GCN 2254
  23. GRB 030329: Optical Observations
  24. GRB 030528 (=H2724) Kyoto optical observation
  25. GRB 030416: Optical Observations
  26. GRB 030329 Optical Observations
  27. GRB030329: XMM-Newton observation
  28. GRB 021004: HST observations
  29. GRB030324: Further Observations of the Candidate Optical Afterglow
  30. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  31. IPN triangulation of GRB030519B=H2716 (small error box)
  32. HETE GRB030329, correction to Rc Observations in Loiano
  33. GRB 030329: Optical limit (contemporaneous imaging)
  34. IPN triangulation of GRB030509 (small errror box)
  35. GRB030329, BVRI photometry
  36. GRB030429, refiend optical brightness
  37. GRB 030329: Optical limit (contemporaneous photography)
  38. GRB030418, BVRcIc field photometry
  39. GRB030429, BVRcIc field photometry
  40. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  41. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  42. GRB030329: RTT150 optical observations and upper limit for a host
  43. GRB030501, optical observation
  44. GRB030501 triangulation (correction to GCN 2194)
  45. GRB030329: RTT150 optical observations and upper limit for a host
  46. GRB 030429: redshift from VLT spectroscopy
  47. GRB030501B triangulation (single error box)
  48. GRB 030329, BVRI photometry
  49. GRB030429: Optical Observations
  50. GRB030501: TAROT candidate afterglow present in archival images
  51. GRB 030429: confirmation of afterglow candidate
  52. GRB 030329 Oprical observations in Rozhen observatory
  53. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  54. IPN triangulation of GRB030425 (single error box)
  55. GRB 030329, the review of the sky area in plate archive (1950-1998)
  56. GRB 030329: optical spectropolarimetry at VLT
  57. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  58. GRB030329: optical polarization
  59. IPN triangulation of GRB030422 (two large error boxes)
  60. GRB030329, optical observation
  61. MASTER:optical observations GRB030418
  62. MASTER:optical observations probable GRB030414
  63. GRB030418: Kiso near infrared observations
  64. GRB 030418: Optical afterglow
  65. OT GRB 030329: early UBVRcIc spectral evolution
  66. OT GRB 030329: early spectrum
  67. IPN triangulation of GRB030414 (small error box)
  68. IPN triangulation of GRB030413 (small error box)
  69. Superluminal motion in GRB 030329 (Correction)
  70. Superluminal motion in GRB 030329
  71. GRB030329, optical position
  72. IPN triangulation of GRB030406 (small error box)
  73. IPN triangulation of GRB050403 (small error box)
  74. GRB 030329: BVRI photometry at Asiago
  75. GRB 030329: VLT V-band photometry
  76. Kiso observation of the GRB030329 at April 6
  77. GRB 030329, color evolution
  78. GRB030328, UBVRcIc field photometry
  79. GRB 030329 Optical observations
  80. GRB030329: Kiso B and R band observations
  81. GRB030328: R upper limit after 6 hours by MASTER
  82. SDSS 0.5m PT observations of GRB030329 (correction)
  83. SDSS 0.5m PT observations of GRB030329
  84. GRB030329: final R-band light curve by MASTER
  85. GRB030329, optical observation
  86. GRB030329, new UBVRcIc field photometry
  87. GRB 030329, light curve and SN prediction
  88. GRB 030329, BRI photometry
  89. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  90. GRB030329: Optical observations at Teramo
  91. GRB 030329: Radio observations at GMRT
  92. Further AAVSO V,B,R observations of GRB030329
  93. GRB 030329: Additional Mt. Laguna Optical Observations
  94. GRB 030329: Observations with ANDICAM
  95. GRB030329: further optical photometry and evidence for a light curve discontinuity
  96. triangulation of GRB 030331 (single error box)
  97. GRB 030329: optical observations
  98. Photometry of GRB030329 - Constant OT Magnitude
  99. GRB030329 - OT brightens
  100. GRB 030329, optical photometry

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