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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"

35958 results found.

  1. IPN detection of renewed activity from SGR1806-20
  2. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  3. IPN triangulation of GRB030710 (annulus)
  4. IPN triangulation of GRB030709 (annulus)
  5. GRB030706 triangulation (single large error box)
  6. IPN triangulation of GRB030706 (annulus)
  7. IPN triangulation of GRB030629 (annulus)
  8. GRB030629 triangulation (Konus-Wind -- Helicon annulus)
  9. 030629 NOT a real GRB
  10. IPN triangulation of GRB030626 (single large error box)
  11. IPN triangulation of GRB030626 (two large error boxes)
  12. GRB030418: R optical observations
  13. GRB030329 -- RATAN-600 data in April-May
  14. Final IPN error ellipse for GRB021206 (the polarized GRB)
  15. GRB 021206, Radio afterglow candidate
  16. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  17. IPN triangulation of GRB030607 (annulus)
  18. IPN triangulation of GRB030606 (two alternate error boxes)
  19. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  20. IPN triangulation of GRB030605B (annulus)
  21. GRB 030528: Optical Observations
  22. IPN triangulation of GRB030605 (annulus)
  23. GRB 030528: tentative NIR counterpart
  24. GRB 030528, radio observations
  25. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  26. GRB030329, further radio observations at GMRT
  27. GRB030528, BVRI field photometry
  28. IPN triangulation of GRB030601 (annulus)
  29. GRB030528: Chandra TOO Planned
  30. GRB 030519B: optical observations.
  31. GRB 030329: optical observations
  32. GRB 030329/SN 2003dh: Jitter Episode
  33. GRB 030528, Teramo optical observation
  34. GRB 030528 Bisei optical observation
  35. GRB030528 (H2724): A long GRB localized by HETE
  36. GRB 030329: Correction to GCN 2254
  37. GRB 030329: Optical Observations
  38. GRB 030528: Optical observations at RIKEN
  39. GRB 030528 (=H2724) Kyoto optical observation
  40. IPN triangulation of GRB030523B (annulus)
  41. GRB 030416: Optical Observations
  42. GRB 030329: Planned XMM-Newton Observation
  43. IPN triangulation of GRB030523 (annulus)
  44. GRB 030329: optical photometry at various french observatories
  45. GRB 030329: optical photometry at Belesta observatory (France)
  46. GRB 030329/SN 2003dh: Possible increase in brightness
  47. GRB 030329: HST ACS Observations of the Host
  48. GRB 030329 Optical Observations
  49. GRB 021004: HST observations
  50. GRB030324: Further Observations of the Candidate Optical Afterglow
  51. IPN triangulation of GRB030519B=H2716 (small error box)
  52. GRB 030418: Second Epoch Optical Observations with Magellan
  53. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  54. IPN triangulation of GRB030519 (annulus)
  55. IPN triangulation of GRB030518C (annulus)
  56. IPN triangulation of GRB030518B (annulus)
  57. IPN triangulation of GRB030518A (annulus)
  58. IPN triangulation of GRB030514 (annulus)
  59. IPN triangulation of GRB030513 (annulus)
  60. IPN triangulation of GRB030509B (annulus)
  61. GRB 030329: Optical limit (contemporaneous imaging)
  62. GRB 030501: final TAROT limits
  63. IPN triangulation of GRB030509 (small errror box)
  64. IPN triangulation of GRB030509 - correction
  65. IPN triangulation of GRB030509 (single error box)
  66. GRB030329: RTT150 optical observations
  67. GRB 030329: Optical limit (contemporaneous photography)
  68. GRB030418, BVRcIc field photometry
  69. GRB 030429: Redshift of neighbor galaxy
  70. GRB030429, BVRcIc field photometry
  71. GRB 030329: High-Resolution Spectroscopy of the Host
  72. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  73. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  74. GRB030429: RTT150 optical observations, a possible host galaxy
  75. IPN triangulation of GRB030506 (annulus)
  76. IPN triangulation of GRB030505B (large error box)
  77. IPN triangulation of GRB030505A (annulus)
  78. GRB030329: RTT150 optical observations and upper limit for a host
  79. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  80. GRB030501, optical observation
  81. GRB030501C triangulation (annulus)
  82. GRB030329: RTT150 optical observations and upper limit for a host
  83. GRB 030429: Radio Observations
  84. GRB 030429: redshift from VLT spectroscopy
  85. GRB 030429: IR photometry with IRSF/SIRIUS
  86. GRB030501B triangulation (single error box)
  87. GRB 030329 Optical Observations
  88. GRB 030329, BVRI photometry
  89. GRB 030501: TAROT possible candidate counterpart
  90. IPN triangulation of GRB030501 (IBIS event; annulus)
  91. IPN triangulation of GRB030501B (annulus)
  92. GRB 030429: confirmation of afterglow candidate
  93. GRB030429, possible optical counterpart
  94. GRB030501 localized by INTEGRAL
  95. GRB030425: CrAO optical observation
  96. IPN triangulation of GRB030429 (annulus)
  97. IPN triangulation of GRB030428 (two large error boxes)
  98. GRB 030329 Oprical observations in Rozhen observatory
  99. GRB 030429: ROTSE-III observations
  100. GRB 030324: Radio Observations

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