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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"

26351 results found.

  1. XRF030824: Optical observations
  2. IPN triangulation of GRB030903 (large error box)
  3. IPN triangulation of GRB030827 (large error box)
  4. GRB030823: optical observations
  5. GRB030823: optical observation at Tokyo Tech
  6. Lulin follow-up observations of GRB030823
  7. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  8. IPN detection of continued activity from SGR1806-20
  9. GRB 030817 = H2808 TAROT optical observations
  10. SGR 1808-20 (=H2802): A Possible new SGR
  11. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  12. XRF 030723: Detection of a rebrightening in the optical afterglow
  13. XRF030723, BVRcIc field photometry update
  14. IPN triangulation of GRB030801 (large error box)
  15. GRB021206 optical counterpart upper limit
  16. IPN triangulation of GRB030726 (large error box)
  17. IPN triangulation of GRB030721 (large error box)
  18. XRF030723 Radio Observations
  19. XRF 030723: confirmation of fading optical counterpart
  20. XRF030723(=H2777): Chandra Observations
  21. GRB030723: Upper limits from historical observations
  22. XRF030723: Palomar observations and proposed counterpart
  23. GRB030725 (=H2779): A Bright GRB Localized by HETE
  24. XRF030723 (= H2777): Chandra Observations Scheduled
  25. XRF030723, BVRcIc field photometry correction
  26. XRF030723, ROTSE-III Early Observations
  27. XRF030723, BVRcIc field photometry
  28. XRF 030723, optical observations
  29. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  30. Konus-Wind detection of the bursts from SGR1806-20 region
  31. SGR 1806-20, submm observations
  32. RXTE PCA Observations of SGR1806-20 Region
  33. IPN triangulation of GRB030714 (two large error boxes)
  34. IPN triangulation of GRB030715 (two large error boxes)
  35. GRB030706 triangulation (single large error box)
  36. GRB030329, optical observation in May
  37. IPN triangulation of GRB030626 (single large error box)
  38. IPN triangulation of GRB030626 (two large error boxes)
  39. GRB030329: second XMM-Newton observation
  40. GRB030329 -- RATAN-600 data in April-May
  41. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  42. IPN triangulation of GRB030606 (two alternate error boxes)
  43. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  44. GRB 030528: tentative NIR counterpart
  45. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  46. GRB030528, BVRI field photometry
  47. GRB030329, SPM optical observations
  48. GRB030528: Chandra TOO Planned
  49. GRB030528(=H2724): Revised SXC Localization
  50. GRB 030528 Bisei optical observation
  51. GRB030528 (H2724): A long GRB localized by HETE
  52. GRB 030329: Correction to GCN 2254
  53. GRB 030329: Optical Observations
  54. GRB 030528 (=H2724) Kyoto optical observation
  55. GRB 030416: Optical Observations
  56. GRB 030329 Optical Observations
  57. GRB030329: XMM-Newton observation
  58. GRB 021004: HST observations
  59. GRB030324: Further Observations of the Candidate Optical Afterglow
  60. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  61. IPN triangulation of GRB030519B=H2716 (small error box)
  62. HETE GRB030329, correction to Rc Observations in Loiano
  63. GRB 030329: Optical limit (contemporaneous imaging)
  64. IPN triangulation of GRB030509 (small errror box)
  65. GRB030329, BVRI photometry
  66. GRB030429, refiend optical brightness
  67. GRB 030329: Optical limit (contemporaneous photography)
  68. GRB030418, BVRcIc field photometry
  69. GRB030429, BVRcIc field photometry
  70. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  71. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  72. GRB030329: RTT150 optical observations and upper limit for a host
  73. GRB030501, optical observation
  74. GRB030501 triangulation (correction to GCN 2194)
  75. GRB030329: RTT150 optical observations and upper limit for a host
  76. GRB 030429: redshift from VLT spectroscopy
  77. GRB030501B triangulation (single error box)
  78. GRB 030329, BVRI photometry
  79. GRB030429: Optical Observations
  80. GRB030501: TAROT candidate afterglow present in archival images
  81. GRB 030429: confirmation of afterglow candidate
  82. GRB 030329 Oprical observations in Rozhen observatory
  83. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  84. IPN triangulation of GRB030425 (single error box)
  85. GRB 030329, the review of the sky area in plate archive (1950-1998)
  86. GRB 030329: optical spectropolarimetry at VLT
  87. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  88. GRB030329: optical polarization
  89. IPN triangulation of GRB030422 (two large error boxes)
  90. GRB030329, optical observation
  91. MASTER:optical observations GRB030418
  92. MASTER:optical observations probable GRB030414
  93. GRB030418: Kiso near infrared observations
  94. GRB 030418: Optical afterglow
  95. OT GRB 030329: early UBVRcIc spectral evolution
  96. OT GRB 030329: early spectrum
  97. IPN triangulation of GRB030414 (small error box)
  98. IPN triangulation of GRB030413 (small error box)
  99. Superluminal motion in GRB 030329 (Correction)
  100. Superluminal motion in GRB 030329

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