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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"

28048 results found.

  1. GRB030823: optical observations
  2. GRB030823: optical observation at Tokyo Tech
  3. Lulin follow-up observations of GRB030823
  4. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  5. IPN detection of continued activity from SGR1806-20
  6. GRB 030817 = H2808 TAROT optical observations
  7. SGR 1808-20 (=H2802): A Possible new SGR
  8. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  9. XRF 030723: Detection of a rebrightening in the optical afterglow
  10. XRF030723, BVRcIc field photometry update
  11. IPN triangulation of GRB030801 (large error box)
  12. GRB021206 optical counterpart upper limit
  13. IPN triangulation of GRB030726 (large error box)
  14. IPN triangulation of GRB030721 (large error box)
  15. XRF030723 Radio Observations
  16. XRF 030723: confirmation of fading optical counterpart
  17. XRF030723(=H2777): Chandra Observations
  18. GRB030723: Upper limits from historical observations
  19. XRF030723: Palomar observations and proposed counterpart
  20. GRB030725 (=H2779): A Bright GRB Localized by HETE
  21. XRF030723 (= H2777): Chandra Observations Scheduled
  22. XRF030723, BVRcIc field photometry correction
  23. XRF030723, ROTSE-III Early Observations
  24. XRF030723, BVRcIc field photometry
  25. XRF 030723, optical observations
  26. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  27. Konus-Wind detection of the bursts from SGR1806-20 region
  28. SGR 1806-20, submm observations
  29. RXTE PCA Observations of SGR1806-20 Region
  30. IPN triangulation of GRB030714 (two large error boxes)
  31. IPN triangulation of GRB030715 (two large error boxes)
  32. GRB030706 triangulation (single large error box)
  33. GRB030329, optical observation in May
  34. IPN triangulation of GRB030626 (single large error box)
  35. IPN triangulation of GRB030626 (two large error boxes)
  36. GRB030329: second XMM-Newton observation
  37. GRB030329 -- RATAN-600 data in April-May
  38. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  39. IPN triangulation of GRB030606 (two alternate error boxes)
  40. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  41. GRB 030528: tentative NIR counterpart
  42. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  43. GRB030528, BVRI field photometry
  44. GRB030329, SPM optical observations
  45. GRB030528: Chandra TOO Planned
  46. GRB030528(=H2724): Revised SXC Localization
  47. GRB 030528 Bisei optical observation
  48. GRB030528 (H2724): A long GRB localized by HETE
  49. GRB 030329: Correction to GCN 2254
  50. GRB 030329: Optical Observations
  51. GRB 030528 (=H2724) Kyoto optical observation
  52. GRB 030416: Optical Observations
  53. GRB 030329 Optical Observations
  54. GRB030329: XMM-Newton observation
  55. GRB 021004: HST observations
  56. GRB030324: Further Observations of the Candidate Optical Afterglow
  57. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  58. IPN triangulation of GRB030519B=H2716 (small error box)
  59. HETE GRB030329, correction to Rc Observations in Loiano
  60. GRB 030329: Optical limit (contemporaneous imaging)
  61. IPN triangulation of GRB030509 (small errror box)
  62. GRB030329, BVRI photometry
  63. GRB030429, refiend optical brightness
  64. GRB 030329: Optical limit (contemporaneous photography)
  65. GRB030418, BVRcIc field photometry
  66. GRB030429, BVRcIc field photometry
  67. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  68. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  69. GRB030329: RTT150 optical observations and upper limit for a host
  70. GRB030501, optical observation
  71. GRB030501 triangulation (correction to GCN 2194)
  72. GRB030329: RTT150 optical observations and upper limit for a host
  73. GRB 030429: redshift from VLT spectroscopy
  74. GRB030501B triangulation (single error box)
  75. GRB 030329, BVRI photometry
  76. GRB030429: Optical Observations
  77. GRB030501: TAROT candidate afterglow present in archival images
  78. GRB 030429: confirmation of afterglow candidate
  79. GRB 030329 Oprical observations in Rozhen observatory
  80. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  81. IPN triangulation of GRB030425 (single error box)
  82. GRB 030329, the review of the sky area in plate archive (1950-1998)
  83. GRB 030329: optical spectropolarimetry at VLT
  84. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  85. GRB030329: optical polarization
  86. IPN triangulation of GRB030422 (two large error boxes)
  87. GRB030329, optical observation
  88. MASTER:optical observations GRB030418
  89. MASTER:optical observations probable GRB030414
  90. GRB030418: Kiso near infrared observations
  91. GRB 030418: Optical afterglow
  92. OT GRB 030329: early UBVRcIc spectral evolution
  93. OT GRB 030329: early spectrum
  94. IPN triangulation of GRB030414 (small error box)
  95. IPN triangulation of GRB030413 (small error box)
  96. Superluminal motion in GRB 030329 (Correction)
  97. Superluminal motion in GRB 030329
  98. GRB030329, optical position
  99. IPN triangulation of GRB030406 (small error box)
  100. IPN triangulation of GRB050403 (small error box)

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