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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"

45447 results found.

  1. GRB030418: R optical observations
  2. HETE detection of burst from SGR1806-20
  3. GRB030329 -- RATAN-600 data in April-May
  4. Final IPN error ellipse for GRB021206 (the polarized GRB)
  5. GRB 021206, Radio afterglow candidate
  6. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  7. IPN triangulation of GRB030607 (annulus)
  8. IPN triangulation of GRB030606 (two alternate error boxes)
  9. GRB030329, SPM optical observations (Correction of GCN2075 R band)
  10. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  11. IPN triangulation of GRB030605B (annulus)
  12. GRB 030528: Optical Observations
  13. IPN triangulation of GRB030605 (annulus)
  14. GRB 030528: tentative NIR counterpart
  15. GRB 030528, radio observations
  16. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  17. GRB030329, further radio observations at GMRT
  18. GRB030528, BVRI field photometry
  19. IPN triangulation of GRB030601 (annulus)
  20. GRB030329, SPM optical observations
  21. GRB030528: Chandra TOO Planned
  22. GRB 030519B: optical observations.
  23. MASTER: optical observation GRB030601
  24. GRB030528(=H2724): Revised SXC Localization
  25. GRB 030329: optical observations
  26. GRB 030329/SN 2003dh: Jitter Episode
  27. GRB 030528, Teramo optical observation
  28. GRB 030528 Bisei optical observation
  29. GRB030528 (H2724): A long GRB localized by HETE
  30. GRB 030329: Correction to GCN 2254
  31. GRB 030329: Optical Observations
  32. GRB 030528: Optical observations at RIKEN
  33. GRB 030528 (=H2724) Kyoto optical observation
  34. IPN triangulation of GRB030523B (annulus)
  35. GRB 030416: Optical Observations
  36. GRB 030329: Planned XMM-Newton Observation
  37. IPN triangulation of GRB030523 (annulus)
  38. GRB 030329: optical photometry at various french observatories
  39. GRB 030329: optical photometry at Belesta observatory (France)
  40. GRB030329, Optical observations
  41. GRB 030329/SN 2003dh: Possible increase in brightness
  42. GRB 030329: HST ACS Observations of the Host
  43. GRB 030329 Optical Observations
  44. GRB030329: XMM-Newton observation
  45. GRB 021004: HST observations
  46. GRB030324: Further Observations of the Candidate Optical Afterglow
  47. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  48. IPN triangulation of GRB030519B=H2716 (small error box)
  49. GRB 030418: Second Epoch Optical Observations with Magellan
  50. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  51. IPN triangulation of GRB030519 (annulus)
  52. IPN triangulation of GRB030518C (annulus)
  53. IPN triangulation of GRB030518B (annulus)
  54. IPN triangulation of GRB030518A (annulus)
  55. IPN triangulation of GRB030514 (annulus)
  56. HETE GRB030329, correction to Rc Observations in Loiano
  57. IPN triangulation of GRB030513 (annulus)
  58. IPN triangulation of GRB030509B (annulus)
  59. GRB 030329: Optical limit (contemporaneous imaging)
  60. GRB 030501: final TAROT limits
  61. IPN triangulation of GRB030509 (small errror box)
  62. IPN triangulation of GRB030509 - correction
  63. IPN triangulation of GRB030509 (single error box)
  64. GRB030329: RTT150 optical observations
  65. GRB030329, BVRI photometry
  66. GRB030429, refiend optical brightness
  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. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  75. GRB030429: RTT150 optical observations, a possible host galaxy
  76. IPN triangulation of GRB030506 (annulus)
  77. IPN triangulation of GRB030505B (large error box)
  78. IPN triangulation of GRB030505A (annulus)
  79. GRB030329: RTT150 optical observations and upper limit for a host
  80. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  81. GRB030501, optical observation
  82. GRB030501 observation report
  83. GRB030501C triangulation (annulus)
  84. GRB030501 triangulation (correction to GCN 2194)
  85. GRB030329: RTT150 optical observations and upper limit for a host
  86. GRB 030429: Radio Observations
  87. GRB 030429: redshift from VLT spectroscopy
  88. GRB 030429: IR photometry with IRSF/SIRIUS
  89. GRB030501B triangulation (single error box)
  90. GRB 030329 Optical Observations
  91. GRB030328, optical observation
  92. GRB 030329, BVRI photometry
  93. GRB030429: Optical Observations
  94. GRB030501: TAROT candidate afterglow present in archival images
  95. GRB 030501: TAROT possible candidate counterpart
  96. IPN triangulation of GRB030501 (IBIS event; annulus)
  97. IPN triangulation of GRB030501B (annulus)
  98. GRB 030429: confirmation of afterglow candidate
  99. GRB030429, possible optical counterpart
  100. GRB030501 localized by INTEGRAL

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