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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.

Advanced Search Examples (click to copy):

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

35953 results found.

  1. IPN triangulation of GRB030706 (annulus)
  2. IPN triangulation of GRB030629 (annulus)
  3. GRB030629 triangulation (Konus-Wind -- Helicon annulus)
  4. 030629 NOT a real GRB
  5. IPN triangulation of GRB030626 (single large error box)
  6. IPN triangulation of GRB030626 (two large error boxes)
  7. GRB030418: R optical observations
  8. GRB030329 -- RATAN-600 data in April-May
  9. Final IPN error ellipse for GRB021206 (the polarized GRB)
  10. GRB 021206, Radio afterglow candidate
  11. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  12. IPN triangulation of GRB030607 (annulus)
  13. IPN triangulation of GRB030606 (two alternate error boxes)
  14. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  15. IPN triangulation of GRB030605B (annulus)
  16. GRB 030528: Optical Observations
  17. IPN triangulation of GRB030605 (annulus)
  18. GRB 030528: tentative NIR counterpart
  19. GRB 030528, radio observations
  20. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  21. GRB030329, further radio observations at GMRT
  22. GRB030528, BVRI field photometry
  23. IPN triangulation of GRB030601 (annulus)
  24. GRB030528: Chandra TOO Planned
  25. GRB 030519B: optical observations.
  26. GRB 030329: optical observations
  27. GRB 030329/SN 2003dh: Jitter Episode
  28. GRB 030528, Teramo optical observation
  29. GRB 030528 Bisei optical observation
  30. GRB030528 (H2724): A long GRB localized by HETE
  31. GRB 030329: Correction to GCN 2254
  32. GRB 030329: Optical Observations
  33. GRB 030528: Optical observations at RIKEN
  34. GRB 030528 (=H2724) Kyoto optical observation
  35. IPN triangulation of GRB030523B (annulus)
  36. GRB 030416: Optical Observations
  37. GRB 030329: Planned XMM-Newton Observation
  38. IPN triangulation of GRB030523 (annulus)
  39. GRB 030329: optical photometry at various french observatories
  40. GRB 030329: optical photometry at Belesta observatory (France)
  41. GRB 030329/SN 2003dh: Possible increase in brightness
  42. GRB 030329: HST ACS Observations of the Host
  43. GRB 030329 Optical Observations
  44. GRB 021004: HST observations
  45. GRB030324: Further Observations of the Candidate Optical Afterglow
  46. IPN triangulation of GRB030519B=H2716 (small error box)
  47. GRB 030418: Second Epoch Optical Observations with Magellan
  48. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  49. IPN triangulation of GRB030519 (annulus)
  50. IPN triangulation of GRB030518C (annulus)
  51. IPN triangulation of GRB030518B (annulus)
  52. IPN triangulation of GRB030518A (annulus)
  53. IPN triangulation of GRB030514 (annulus)
  54. IPN triangulation of GRB030513 (annulus)
  55. IPN triangulation of GRB030509B (annulus)
  56. GRB 030329: Optical limit (contemporaneous imaging)
  57. GRB 030501: final TAROT limits
  58. IPN triangulation of GRB030509 (small errror box)
  59. IPN triangulation of GRB030509 - correction
  60. IPN triangulation of GRB030509 (single error box)
  61. GRB030329: RTT150 optical observations
  62. GRB 030329: Optical limit (contemporaneous photography)
  63. GRB030418, BVRcIc field photometry
  64. GRB 030429: Redshift of neighbor galaxy
  65. GRB030429, BVRcIc field photometry
  66. GRB 030329: High-Resolution Spectroscopy of the Host
  67. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  68. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  69. GRB030429: RTT150 optical observations, a possible host galaxy
  70. IPN triangulation of GRB030506 (annulus)
  71. IPN triangulation of GRB030505B (large error box)
  72. IPN triangulation of GRB030505A (annulus)
  73. GRB030329: RTT150 optical observations and upper limit for a host
  74. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  75. GRB030501, optical observation
  76. GRB030501C triangulation (annulus)
  77. GRB030329: RTT150 optical observations and upper limit for a host
  78. GRB 030429: Radio Observations
  79. GRB 030429: redshift from VLT spectroscopy
  80. GRB 030429: IR photometry with IRSF/SIRIUS
  81. GRB030501B triangulation (single error box)
  82. GRB 030329 Optical Observations
  83. GRB 030329, BVRI photometry
  84. GRB 030501: TAROT possible candidate counterpart
  85. IPN triangulation of GRB030501 (IBIS event; annulus)
  86. IPN triangulation of GRB030501B (annulus)
  87. GRB 030429: confirmation of afterglow candidate
  88. GRB030429, possible optical counterpart
  89. GRB030501 localized by INTEGRAL
  90. GRB030425: CrAO optical observation
  91. IPN triangulation of GRB030429 (annulus)
  92. IPN triangulation of GRB030428 (two large error boxes)
  93. GRB 030329 Oprical observations in Rozhen observatory
  94. GRB 030429: ROTSE-III observations
  95. GRB 030324: Radio Observations
  96. GRB030329 observed as a sudden ionospheric disturbance (SID)
  97. IPN triangulation of GRB030426 (annulus)
  98. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  99. IPN triangulation of GRB030425 (single error box)
  100. GRB 030329, the review of the sky area in plate archive (1950-1998)

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