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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"

3274 results found.

  1. GRB 050124: NIR afterglow confirmed with Keck/NIRC
  2. GRB 050124: NIR Candidates from Keck/NIRC
  3. GRB050117: Palomar WIRC Ks-band observations
  4. NIR Observations of GRB 041219
  5. GRB 041211: Infrared Observations
  6. GRB041015: Near-Infrared observations
  7. GRB041006: Near Infrared observations
  8. GRB040827: analysis of the XMM-Newton observation
  9. GRB 040827: 2nd epoch of Magellan K-band imaging
  10. GRB 040827: Detection of NIR afterglow
  11. GRB 040812: Second epoch CXO Observations
  12. CXO observation of GRB 040812
  13. GRB 040730, infrared observations
  14. SGR 1806-20: no IR variability of the proposed counterparts
  15. SGR 1806-20, potential NIR counterpart
  16. GRB 040511: NIR observations with REM
  17. IBAS GRB alerts 1739, 1740, 1741
  18. GRB040223: Deep NIR NTT data re-analysis
  19. GRB 040223: Deep NIR NTT observations
  20. GRB 040223: REM IJK Observations
  21. GRB 040223 XMM-Newton observation ...
  22. GRB 031203 XMM-Newton observation
  23. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  24. XMM-Newton Observation of GRB031203
  25. GRB 031203: Deep NIR NTT & VLT observations
  26. XMM-Newton Observation of GRB031203
  27. GRB 031203: IR NTTobservations do not confirm REM detection
  28. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  29. GRB 031203: IR REM Observations
  30. GRB 031203 XMM-Newton observation
  31. XRF030723: Palomar observations and proposed counterpart
  32. GRB030329: second XMM-Newton observation
  33. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  34. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  35. GRB 030528: tentative NIR counterpart
  36. GRB 030329: Optical limit (contemporaneous photography)
  37. GRB 030429: IR photometry with IRSF/SIRIUS
  38. GRB030501: TAROT candidate afterglow present in archival images
  39. GRB 030429: confirmation of afterglow candidate
  40. GRB030418: Kiso near infrared observations
  41. GRB030329: Near Infrared Observations at Gunma
  42. GRB 030329: fading X-ray afterglow with RXTE
  43. XMM-Newton observation of GRB030227
  44. GRB 030115: Further IR observations with IRSF/SIRIUS
  45. GRB 030115: IR observations with IRSF/SIRIUS
  46. GRB 021201, optical observations
  47. GRB 021201 (short/hard), NOT observations
  48. Chandra observation of the IPN error box of GRB021201 (short/hard)
  49. Detection of activity from SGR 1900+14 with the RXTE/PCA
  50. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  51. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  52. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  53. SGR-like Bursts from the AXP 1E 2259+586
  54. GRB 020418, optical/near-IR observations
  55. GRB020531, optical observations
  56. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  57. GRB 020321: Candidate X-ray Counterparts
  58. GRB 020331: Candidate Optical Afterglow
  59. GRB 020331: NIR Observations
  60. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  61. VLT observations of GRB 020124: The fading optical/near-infrared afterglow
  62. GRB 011121: NIR observations, host galaxy?
  63. GRB 011121: Detection of Bright IR Counterpart
  64. SGR 1900+14 : RXTE observations
  65. GRB 001204: Ks observations
  66. GRB 001212 possible OA in 2MASS
  67. GRB 001109: deep JHK upper limits
  68. The Likely Optical/Infrared Afterglow of GRB 001011
  69. SGR 1806-20 burst activity
  70. GRB 000418: Detection of the Host Galaxy
  71. X-ray Afterglow of GRB 000529
  72. IR observations of GRB991216
  73. BeppoSAX NFI Observation of GRB991106
  74. GRB980703: Radio transient

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