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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"

36155 results found.

  1. GRB030629 triangulation (Konus-Wind -- Helicon annulus)
  2. 030629 NOT a real GRB
  3. IPN triangulation of GRB030626 (single large error box)
  4. IPN triangulation of GRB030626 (two large error boxes)
  5. GRB030418: R optical observations
  6. GRB030329 -- RATAN-600 data in April-May
  7. Final IPN error ellipse for GRB021206 (the polarized GRB)
  8. GRB 021206, Radio afterglow candidate
  9. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  10. IPN triangulation of GRB030607 (annulus)
  11. IPN triangulation of GRB030606 (two alternate error boxes)
  12. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  13. IPN triangulation of GRB030605B (annulus)
  14. GRB 030528: Optical Observations
  15. IPN triangulation of GRB030605 (annulus)
  16. GRB 030528: tentative NIR counterpart
  17. GRB 030528, radio observations
  18. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  19. GRB030329, further radio observations at GMRT
  20. GRB030528, BVRI field photometry
  21. IPN triangulation of GRB030601 (annulus)
  22. GRB030528: Chandra TOO Planned
  23. GRB 030519B: optical observations.
  24. GRB 030329: optical observations
  25. GRB 030329/SN 2003dh: Jitter Episode
  26. GRB 030528, Teramo optical observation
  27. GRB 030528 Bisei optical observation
  28. GRB030528 (H2724): A long GRB localized by HETE
  29. GRB 030329: Correction to GCN 2254
  30. GRB 030329: Optical Observations
  31. GRB 030528: Optical observations at RIKEN
  32. GRB 030528 (=H2724) Kyoto optical observation
  33. IPN triangulation of GRB030523B (annulus)
  34. GRB 030416: Optical Observations
  35. GRB 030329: Planned XMM-Newton Observation
  36. IPN triangulation of GRB030523 (annulus)
  37. GRB 030329: optical photometry at various french observatories
  38. GRB 030329: optical photometry at Belesta observatory (France)
  39. GRB 030329/SN 2003dh: Possible increase in brightness
  40. GRB 030329: HST ACS Observations of the Host
  41. GRB 030329 Optical Observations
  42. GRB 021004: HST observations
  43. GRB030324: Further Observations of the Candidate Optical Afterglow
  44. IPN triangulation of GRB030519B=H2716 (small error box)
  45. GRB 030418: Second Epoch Optical Observations with Magellan
  46. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  47. IPN triangulation of GRB030519 (annulus)
  48. IPN triangulation of GRB030518C (annulus)
  49. IPN triangulation of GRB030518B (annulus)
  50. IPN triangulation of GRB030518A (annulus)
  51. IPN triangulation of GRB030514 (annulus)
  52. IPN triangulation of GRB030513 (annulus)
  53. IPN triangulation of GRB030509B (annulus)
  54. GRB 030329: Optical limit (contemporaneous imaging)
  55. GRB 030501: final TAROT limits
  56. IPN triangulation of GRB030509 (small errror box)
  57. IPN triangulation of GRB030509 - correction
  58. IPN triangulation of GRB030509 (single error box)
  59. GRB030329: RTT150 optical observations
  60. GRB 030329: Optical limit (contemporaneous photography)
  61. GRB030418, BVRcIc field photometry
  62. GRB 030429: Redshift of neighbor galaxy
  63. GRB030429, BVRcIc field photometry
  64. GRB 030329: High-Resolution Spectroscopy of the Host
  65. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  66. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  67. GRB030429: RTT150 optical observations, a possible host galaxy
  68. IPN triangulation of GRB030506 (annulus)
  69. IPN triangulation of GRB030505B (large error box)
  70. IPN triangulation of GRB030505A (annulus)
  71. GRB030329: RTT150 optical observations and upper limit for a host
  72. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  73. GRB030501, optical observation
  74. GRB030501C triangulation (annulus)
  75. GRB030329: RTT150 optical observations and upper limit for a host
  76. GRB 030429: Radio Observations
  77. GRB 030429: redshift from VLT spectroscopy
  78. GRB 030429: IR photometry with IRSF/SIRIUS
  79. GRB030501B triangulation (single error box)
  80. GRB 030329 Optical Observations
  81. GRB 030329, BVRI photometry
  82. GRB 030501: TAROT possible candidate counterpart
  83. IPN triangulation of GRB030501 (IBIS event; annulus)
  84. IPN triangulation of GRB030501B (annulus)
  85. GRB 030429: confirmation of afterglow candidate
  86. GRB030429, possible optical counterpart
  87. GRB030501 localized by INTEGRAL
  88. GRB030425: CrAO optical observation
  89. IPN triangulation of GRB030429 (annulus)
  90. IPN triangulation of GRB030428 (two large error boxes)
  91. GRB 030329 Oprical observations in Rozhen observatory
  92. GRB 030429: ROTSE-III observations
  93. GRB 030324: Radio Observations
  94. GRB030329 observed as a sudden ionospheric disturbance (SID)
  95. IPN triangulation of GRB030426 (annulus)
  96. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  97. IPN triangulation of GRB030425 (single error box)
  98. GRB 030329, the review of the sky area in plate archive (1950-1998)
  99. GRB 030329: Spectral Evolution of SN 2003dh
  100. Optical Observations of GRB 030418 with Magellan

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