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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

45547 results found.

  1. GRB030329 -- RATAN-600 data in April-May
  2. Final IPN error ellipse for GRB021206 (the polarized GRB)
  3. GRB 021206, Radio afterglow candidate
  4. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  5. IPN triangulation of GRB030607 (annulus)
  6. IPN triangulation of GRB030606 (two alternate error boxes)
  7. GRB030329, SPM optical observations (Correction of GCN2075 R band)
  8. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  9. IPN triangulation of GRB030605B (annulus)
  10. GRB 030528: Optical Observations
  11. IPN triangulation of GRB030605 (annulus)
  12. GRB 030528: tentative NIR counterpart
  13. GRB 030528, radio observations
  14. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  15. GRB030329, further radio observations at GMRT
  16. GRB030528, BVRI field photometry
  17. IPN triangulation of GRB030601 (annulus)
  18. GRB030329, SPM optical observations
  19. GRB030528: Chandra TOO Planned
  20. GRB 030519B: optical observations.
  21. MASTER: optical observation GRB030601
  22. GRB030528(=H2724): Revised SXC Localization
  23. GRB 030329: optical observations
  24. GRB 030329/SN 2003dh: Jitter Episode
  25. GRB 030528, Teramo optical observation
  26. GRB 030528 Bisei optical observation
  27. GRB030528 (H2724): A long GRB localized by HETE
  28. GRB 030329: Correction to GCN 2254
  29. GRB 030329: Optical Observations
  30. GRB 030528: Optical observations at RIKEN
  31. GRB 030528 (=H2724) Kyoto optical observation
  32. IPN triangulation of GRB030523B (annulus)
  33. GRB 030416: Optical Observations
  34. GRB 030329: Planned XMM-Newton Observation
  35. IPN triangulation of GRB030523 (annulus)
  36. GRB 030329: optical photometry at various french observatories
  37. GRB 030329: optical photometry at Belesta observatory (France)
  38. GRB030329, Optical observations
  39. GRB 030329/SN 2003dh: Possible increase in brightness
  40. GRB 030329: HST ACS Observations of the Host
  41. GRB 030329 Optical Observations
  42. GRB030329: XMM-Newton observation
  43. GRB 021004: HST observations
  44. GRB030324: Further Observations of the Candidate Optical Afterglow
  45. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  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. HETE GRB030329, correction to Rc Observations in Loiano
  55. IPN triangulation of GRB030513 (annulus)
  56. IPN triangulation of GRB030509B (annulus)
  57. GRB 030329: Optical limit (contemporaneous imaging)
  58. GRB 030501: final TAROT limits
  59. IPN triangulation of GRB030509 (small errror box)
  60. IPN triangulation of GRB030509 - correction
  61. IPN triangulation of GRB030509 (single error box)
  62. GRB030329: RTT150 optical observations
  63. GRB030329, BVRI photometry
  64. GRB030429, refiend optical brightness
  65. GRB 030329: Optical limit (contemporaneous photography)
  66. GRB030418, BVRcIc field photometry
  67. GRB 030429: Redshift of neighbor galaxy
  68. GRB030429, BVRcIc field photometry
  69. GRB 030329: High-Resolution Spectroscopy of the Host
  70. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  71. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  72. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  73. GRB030429: RTT150 optical observations, a possible host galaxy
  74. IPN triangulation of GRB030506 (annulus)
  75. IPN triangulation of GRB030505B (large error box)
  76. IPN triangulation of GRB030505A (annulus)
  77. GRB030329: RTT150 optical observations and upper limit for a host
  78. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  79. GRB030501, optical observation
  80. GRB030501 observation report
  81. GRB030501C triangulation (annulus)
  82. GRB030501 triangulation (correction to GCN 2194)
  83. GRB030329: RTT150 optical observations and upper limit for a host
  84. GRB 030429: Radio Observations
  85. GRB 030429: redshift from VLT spectroscopy
  86. GRB 030429: IR photometry with IRSF/SIRIUS
  87. GRB030501B triangulation (single error box)
  88. GRB 030329 Optical Observations
  89. GRB030328, optical observation
  90. GRB 030329, BVRI photometry
  91. GRB030429: Optical Observations
  92. GRB030501: TAROT candidate afterglow present in archival images
  93. GRB 030501: TAROT possible candidate counterpart
  94. IPN triangulation of GRB030501 (IBIS event; annulus)
  95. IPN triangulation of GRB030501B (annulus)
  96. GRB 030429: confirmation of afterglow candidate
  97. GRB030429, possible optical counterpart
  98. GRB030501 localized by INTEGRAL
  99. GRB030425: CrAO optical observation
  100. IPN triangulation of GRB030429 (annulus)

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