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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"

42936 results found.

  1. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  2. IPN triangulation of GRB030607 (annulus)
  3. IPN triangulation of GRB030606 (two alternate error boxes)
  4. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  5. IPN triangulation of GRB030605B (annulus)
  6. GRB 030528: Optical Observations
  7. IPN triangulation of GRB030605 (annulus)
  8. GRB 030528: tentative NIR counterpart
  9. GRB 030528, radio observations
  10. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  11. GRB030329, further radio observations at GMRT
  12. GRB030528, BVRI field photometry
  13. IPN triangulation of GRB030601 (annulus)
  14. GRB030329, SPM optical observations
  15. GRB030528: Chandra TOO Planned
  16. GRB 030519B: optical observations.
  17. MASTER: optical observation GRB030601
  18. GRB030528(=H2724): Revised SXC Localization
  19. GRB 030329/SN 2003dh: Jitter Episode
  20. GRB 030528, Teramo optical observation
  21. GRB 030528 Bisei optical observation
  22. GRB030528 (H2724): A long GRB localized by HETE
  23. GRB 030329: Correction to GCN 2254
  24. GRB 030329: Optical Observations
  25. GRB 030528: Optical observations at RIKEN
  26. GRB 030528 (=H2724) Kyoto optical observation
  27. IPN triangulation of GRB030523B (annulus)
  28. GRB 030416: Optical Observations
  29. IPN triangulation of GRB030523 (annulus)
  30. GRB 030329: optical photometry at various french observatories
  31. GRB 030329: optical photometry at Belesta observatory (France)
  32. GRB030329, Optical observations
  33. GRB 030329/SN 2003dh: Possible increase in brightness
  34. GRB 030329: HST ACS Observations of the Host
  35. GRB030329: XMM-Newton observation
  36. GRB 021004: HST observations
  37. GRB030324: Further Observations of the Candidate Optical Afterglow
  38. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  39. IPN triangulation of GRB030519B=H2716 (small error box)
  40. GRB 030418: Second Epoch Optical Observations with Magellan
  41. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  42. IPN triangulation of GRB030519 (annulus)
  43. IPN triangulation of GRB030518C (annulus)
  44. IPN triangulation of GRB030518B (annulus)
  45. IPN triangulation of GRB030518A (annulus)
  46. IPN triangulation of GRB030514 (annulus)
  47. HETE GRB030329, correction to Rc Observations in Loiano
  48. IPN triangulation of GRB030513 (annulus)
  49. IPN triangulation of GRB030509B (annulus)
  50. GRB 030329: Optical limit (contemporaneous imaging)
  51. GRB 030501: final TAROT limits
  52. IPN triangulation of GRB030509 (small errror box)
  53. IPN triangulation of GRB030509 (single error box)
  54. GRB030329: RTT150 optical observations
  55. GRB030329, BVRI photometry
  56. GRB030429, refiend optical brightness
  57. GRB 030329: Optical limit (contemporaneous photography)
  58. GRB030418, BVRcIc field photometry
  59. GRB 030429: Redshift of neighbor galaxy
  60. GRB030429, BVRcIc field photometry
  61. GRB 030329: High-Resolution Spectroscopy of the Host
  62. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  63. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  64. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  65. GRB030429: RTT150 optical observations, a possible host galaxy
  66. IPN triangulation of GRB030506 (annulus)
  67. IPN triangulation of GRB030505B (large error box)
  68. IPN triangulation of GRB030505A (annulus)
  69. GRB030329: RTT150 optical observations and upper limit for a host
  70. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  71. GRB030501, optical observation
  72. GRB030501C triangulation (annulus)
  73. GRB030501 triangulation (correction to GCN 2194)
  74. GRB030329: RTT150 optical observations and upper limit for a host
  75. GRB 030429: Radio Observations
  76. GRB 030429: redshift from VLT spectroscopy
  77. GRB 030429: IR photometry with IRSF/SIRIUS
  78. GRB030501B triangulation (single error box)
  79. GRB 030329 Optical Observations
  80. GRB030328, optical observation
  81. GRB 030329, BVRI photometry
  82. GRB030429: Optical Observations
  83. GRB030501: TAROT candidate afterglow present in archival images
  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. GRB030329, SPM optical observations (Correction)

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